1 /*
2 * Copyright (c) 1999, 2016, 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 "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/dependencyContext.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/compileLog.hpp"
33 #include "compiler/compilerOracle.hpp"
34 #include "compiler/directivesParser.hpp"
35 #include "gc/shared/referencePendingListLocker.hpp"
36 #include "interpreter/linkResolver.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/method.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "prims/nativeLookup.hpp"
42 #include "prims/whitebox.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/atomic.inline.hpp"
45 #include "runtime/compilationPolicy.hpp"
46 #include "runtime/init.hpp"
47 #include "runtime/interfaceSupport.hpp"
48 #include "runtime/javaCalls.hpp"
49 #include "runtime/os.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/sweeper.hpp"
52 #include "trace/tracing.hpp"
53 #include "utilities/dtrace.hpp"
54 #include "utilities/events.hpp"
55 #ifdef COMPILER1
56 #include "c1/c1_Compiler.hpp"
57 #endif
58 #if INCLUDE_JVMCI
59 #include "jvmci/jvmciCompiler.hpp"
60 #include "jvmci/jvmciRuntime.hpp"
61 #include "jvmci/jvmciJavaClasses.hpp"
62 #include "runtime/vframe.hpp"
63 #endif
64 #ifdef COMPILER2
65 #include "opto/c2compiler.hpp"
66 #endif
67 #ifdef SHARK
68 #include "shark/sharkCompiler.hpp"
69 #endif
70
71 #ifdef DTRACE_ENABLED
72
73 // Only bother with this argument setup if dtrace is available
74
75 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
76 { \
77 Symbol* klass_name = (method)->klass_name(); \
78 Symbol* name = (method)->name(); \
79 Symbol* signature = (method)->signature(); \
80 HOTSPOT_METHOD_COMPILE_BEGIN( \
81 (char *) comp_name, strlen(comp_name), \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length()); \
85 }
86
87 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
88 { \
89 Symbol* klass_name = (method)->klass_name(); \
90 Symbol* name = (method)->name(); \
91 Symbol* signature = (method)->signature(); \
92 HOTSPOT_METHOD_COMPILE_END( \
93 (char *) comp_name, strlen(comp_name), \
94 (char *) klass_name->bytes(), klass_name->utf8_length(), \
95 (char *) name->bytes(), name->utf8_length(), \
96 (char *) signature->bytes(), signature->utf8_length(), (success)); \
97 }
98
99 #else // ndef DTRACE_ENABLED
100
101 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
102 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
103
104 #endif // ndef DTRACE_ENABLED
105
106 bool CompileBroker::_initialized = false;
107 volatile bool CompileBroker::_should_block = false;
108 volatile jint CompileBroker::_print_compilation_warning = 0;
109 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
110
111 // The installed compiler(s)
112 AbstractCompiler* CompileBroker::_compilers[2];
113
114 // These counters are used to assign an unique ID to each compilation.
115 volatile jint CompileBroker::_compilation_id = 0;
116 volatile jint CompileBroker::_osr_compilation_id = 0;
117
118 // Debugging information
119 int CompileBroker::_last_compile_type = no_compile;
120 int CompileBroker::_last_compile_level = CompLevel_none;
121 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
122
123 // Performance counters
124 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
125 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
126 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
127
128 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
129 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
130 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
131 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
132 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
133
134 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
135 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
136 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
137 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
138
139 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
140 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
141 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
142 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
143 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
144 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
145 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
146
147 // Timers and counters for generating statistics
148 elapsedTimer CompileBroker::_t_total_compilation;
149 elapsedTimer CompileBroker::_t_osr_compilation;
150 elapsedTimer CompileBroker::_t_standard_compilation;
151 elapsedTimer CompileBroker::_t_invalidated_compilation;
152 elapsedTimer CompileBroker::_t_bailedout_compilation;
153
154 int CompileBroker::_total_bailout_count = 0;
155 int CompileBroker::_total_invalidated_count = 0;
156 int CompileBroker::_total_compile_count = 0;
157 int CompileBroker::_total_osr_compile_count = 0;
158 int CompileBroker::_total_standard_compile_count = 0;
159
160 int CompileBroker::_sum_osr_bytes_compiled = 0;
161 int CompileBroker::_sum_standard_bytes_compiled = 0;
162 int CompileBroker::_sum_nmethod_size = 0;
163 int CompileBroker::_sum_nmethod_code_size = 0;
164
165 long CompileBroker::_peak_compilation_time = 0;
166
167 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
168 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
169
170 class CompilationLog : public StringEventLog {
171 public:
172 CompilationLog() : StringEventLog("Compilation events") {
173 }
174
175 void log_compile(JavaThread* thread, CompileTask* task) {
176 StringLogMessage lm;
177 stringStream sstr = lm.stream();
178 // msg.time_stamp().update_to(tty->time_stamp().ticks());
179 task->print(&sstr, NULL, true, false);
180 log(thread, "%s", (const char*)lm);
181 }
182
183 void log_nmethod(JavaThread* thread, nmethod* nm) {
184 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
185 nm->compile_id(), nm->is_osr_method() ? "%" : "",
186 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
187 }
188
189 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
190 StringLogMessage lm;
191 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
192 if (retry_message != NULL) {
193 lm.append(" (%s)", retry_message);
194 }
195 lm.print("\n");
196 log(thread, "%s", (const char*)lm);
197 }
198
199 void log_metaspace_failure(const char* reason) {
200 ResourceMark rm;
201 StringLogMessage lm;
202 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
203 lm.print("\n");
204 log(JavaThread::current(), "%s", (const char*)lm);
205 }
206 };
207
208 static CompilationLog* _compilation_log = NULL;
209
210 bool compileBroker_init() {
211 if (LogEvents) {
212 _compilation_log = new CompilationLog();
213 }
214
215 // init directives stack, adding default directive
216 DirectivesStack::init();
217
218 if (DirectivesParser::has_file()) {
219 return DirectivesParser::parse_from_flag();
220 } else if (CompilerDirectivesPrint) {
221 // Print default directive even when no other was added
222 DirectivesStack::print(tty);
223 }
224
225 return true;
226 }
227
228 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
229 CompilerThread* thread = CompilerThread::current();
230 thread->set_task(task);
231 #if INCLUDE_JVMCI
232 if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) {
233 task->set_jvmci_compiler_thread(thread);
234 }
235 #endif
236 CompileLog* log = thread->log();
237 if (log != NULL) task->log_task_start(log);
238 }
239
240 CompileTaskWrapper::~CompileTaskWrapper() {
241 CompilerThread* thread = CompilerThread::current();
242 CompileTask* task = thread->task();
243 CompileLog* log = thread->log();
244 if (log != NULL) task->log_task_done(log);
245 thread->set_task(NULL);
246 task->set_code_handle(NULL);
247 thread->set_env(NULL);
248 if (task->is_blocking()) {
249 bool free_task = false;
250 {
251 MutexLocker notifier(task->lock(), thread);
252 task->mark_complete();
253 #if INCLUDE_JVMCI
254 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
255 if (!task->has_waiter()) {
256 // The waiting thread timed out and thus did not free the task.
257 free_task = true;
258 }
259 task->set_jvmci_compiler_thread(NULL);
260 }
261 #endif
262 if (!free_task) {
263 // Notify the waiting thread that the compilation has completed
264 // so that it can free the task.
265 task->lock()->notify_all();
266 }
267 }
268 if (free_task) {
269 // The task can only be freed once the task lock is released.
270 CompileTask::free(task);
271 }
272 } else {
273 task->mark_complete();
274
275 // By convention, the compiling thread is responsible for
276 // recycling a non-blocking CompileTask.
277 CompileTask::free(task);
278 }
279 }
280
281 /**
282 * Add a CompileTask to a CompileQueue.
283 */
284 void CompileQueue::add(CompileTask* task) {
285 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
286
287 task->set_next(NULL);
288 task->set_prev(NULL);
289
290 if (_last == NULL) {
291 // The compile queue is empty.
292 assert(_first == NULL, "queue is empty");
293 _first = task;
294 _last = task;
295 } else {
296 // Append the task to the queue.
297 assert(_last->next() == NULL, "not last");
298 _last->set_next(task);
299 task->set_prev(_last);
300 _last = task;
301 }
302 ++_size;
303
304 // Mark the method as being in the compile queue.
305 task->method()->set_queued_for_compilation();
306
307 if (CIPrintCompileQueue) {
308 print_tty();
309 }
310
311 if (LogCompilation && xtty != NULL) {
312 task->log_task_queued();
313 }
314
315 // Notify CompilerThreads that a task is available.
316 MethodCompileQueue_lock->notify_all();
317 }
318
319 /**
320 * Empties compilation queue by putting all compilation tasks onto
321 * a freelist. Furthermore, the method wakes up all threads that are
322 * waiting on a compilation task to finish. This can happen if background
323 * compilation is disabled.
324 */
325 void CompileQueue::free_all() {
326 MutexLocker mu(MethodCompileQueue_lock);
327 CompileTask* next = _first;
328
329 // Iterate over all tasks in the compile queue
330 while (next != NULL) {
331 CompileTask* current = next;
332 next = current->next();
333 {
334 // Wake up thread that blocks on the compile task.
335 MutexLocker ct_lock(current->lock());
336 current->lock()->notify();
337 }
338 // Put the task back on the freelist.
339 CompileTask::free(current);
340 }
341 _first = NULL;
342
343 // Wake up all threads that block on the queue.
344 MethodCompileQueue_lock->notify_all();
345 }
346
347 /**
348 * Get the next CompileTask from a CompileQueue
349 */
350 CompileTask* CompileQueue::get() {
351 // save methods from RedefineClasses across safepoint
352 // across MethodCompileQueue_lock below.
353 methodHandle save_method;
354 methodHandle save_hot_method;
355
356 MutexLocker locker(MethodCompileQueue_lock);
357 // If _first is NULL we have no more compile jobs. There are two reasons for
358 // having no compile jobs: First, we compiled everything we wanted. Second,
359 // we ran out of code cache so compilation has been disabled. In the latter
360 // case we perform code cache sweeps to free memory such that we can re-enable
361 // compilation.
362 while (_first == NULL) {
363 // Exit loop if compilation is disabled forever
364 if (CompileBroker::is_compilation_disabled_forever()) {
365 return NULL;
366 }
367
368 // If there are no compilation tasks and we can compile new jobs
369 // (i.e., there is enough free space in the code cache) there is
370 // no need to invoke the sweeper. As a result, the hotness of methods
371 // remains unchanged. This behavior is desired, since we want to keep
372 // the stable state, i.e., we do not want to evict methods from the
373 // code cache if it is unnecessary.
374 // We need a timed wait here, since compiler threads can exit if compilation
375 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
376 // is not critical and we do not want idle compiler threads to wake up too often.
377 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
378 }
379
380 if (CompileBroker::is_compilation_disabled_forever()) {
381 return NULL;
382 }
383
384 CompileTask* task;
385 {
386 NoSafepointVerifier nsv;
387 task = CompilationPolicy::policy()->select_task(this);
388 }
389
390 // Save method pointers across unlock safepoint. The task is removed from
391 // the compilation queue, which is walked during RedefineClasses.
392 save_method = methodHandle(task->method());
393 save_hot_method = methodHandle(task->hot_method());
394
395 remove(task);
396 purge_stale_tasks(); // may temporarily release MCQ lock
397 return task;
398 }
399
400 // Clean & deallocate stale compile tasks.
401 // Temporarily releases MethodCompileQueue lock.
402 void CompileQueue::purge_stale_tasks() {
403 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
404 if (_first_stale != NULL) {
405 // Stale tasks are purged when MCQ lock is released,
406 // but _first_stale updates are protected by MCQ lock.
407 // Once task processing starts and MCQ lock is released,
408 // other compiler threads can reuse _first_stale.
409 CompileTask* head = _first_stale;
410 _first_stale = NULL;
411 {
412 MutexUnlocker ul(MethodCompileQueue_lock);
413 for (CompileTask* task = head; task != NULL; ) {
414 CompileTask* next_task = task->next();
415 CompileTaskWrapper ctw(task); // Frees the task
416 task->set_failure_reason("stale task");
417 task = next_task;
418 }
419 }
420 }
421 }
422
423 void CompileQueue::remove(CompileTask* task) {
424 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
425 if (task->prev() != NULL) {
426 task->prev()->set_next(task->next());
427 } else {
428 // max is the first element
429 assert(task == _first, "Sanity");
430 _first = task->next();
431 }
432
433 if (task->next() != NULL) {
434 task->next()->set_prev(task->prev());
435 } else {
436 // max is the last element
437 assert(task == _last, "Sanity");
438 _last = task->prev();
439 }
440 --_size;
441 }
442
443 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
444 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
445 remove(task);
446
447 // Enqueue the task for reclamation (should be done outside MCQ lock)
448 task->set_next(_first_stale);
449 task->set_prev(NULL);
450 _first_stale = task;
451 }
452
453 // methods in the compile queue need to be marked as used on the stack
454 // so that they don't get reclaimed by Redefine Classes
455 void CompileQueue::mark_on_stack() {
456 CompileTask* task = _first;
457 while (task != NULL) {
458 task->mark_on_stack();
459 task = task->next();
460 }
461 }
462
463
464 CompileQueue* CompileBroker::compile_queue(int comp_level) {
465 if (is_c2_compile(comp_level)) return _c2_compile_queue;
466 if (is_c1_compile(comp_level)) return _c1_compile_queue;
467 return NULL;
468 }
469
470 void CompileBroker::print_compile_queues(outputStream* st) {
471 st->print_cr("Current compiles: ");
472 MutexLocker locker(MethodCompileQueue_lock);
473
474 char buf[2000];
475 int buflen = sizeof(buf);
476 Threads::print_threads_compiling(st, buf, buflen);
477
478 st->cr();
479 if (_c1_compile_queue != NULL) {
480 _c1_compile_queue->print(st);
481 }
482 if (_c2_compile_queue != NULL) {
483 _c2_compile_queue->print(st);
484 }
485 }
486
487 void CompileQueue::print(outputStream* st) {
488 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
489 st->print_cr("%s:", name());
490 CompileTask* task = _first;
491 if (task == NULL) {
492 st->print_cr("Empty");
493 } else {
494 while (task != NULL) {
495 task->print(st, NULL, true, true);
496 task = task->next();
497 }
498 }
499 st->cr();
500 }
501
502 void CompileQueue::print_tty() {
503 ttyLocker ttyl;
504 print(tty);
505 }
506
507 CompilerCounters::CompilerCounters() {
508 _current_method[0] = '\0';
509 _compile_type = CompileBroker::no_compile;
510 }
511
512 // ------------------------------------------------------------------
513 // CompileBroker::compilation_init
514 //
515 // Initialize the Compilation object
516 void CompileBroker::compilation_init(TRAPS) {
517 _last_method_compiled[0] = '\0';
518
519 // No need to initialize compilation system if we do not use it.
520 if (!UseCompiler) {
521 return;
522 }
523 #ifndef SHARK
524 // Set the interface to the current compiler(s).
525 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
526 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
527
528 #if INCLUDE_JVMCI
529 if (EnableJVMCI) {
530 // This is creating a JVMCICompiler singleton.
531 JVMCICompiler* jvmci = new JVMCICompiler();
532
533 if (UseJVMCICompiler) {
534 _compilers[1] = jvmci;
535 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
536 if (BootstrapJVMCI) {
537 // JVMCI will bootstrap so give it more threads
538 c2_count = MIN2(32, os::active_processor_count());
539 }
540 } else {
541 c2_count = JVMCIThreads;
542 }
543 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
544 } else {
545 c1_count = JVMCIHostThreads;
546 }
547
548 if (!UseInterpreter || !BackgroundCompilation) {
549 // Force initialization of JVMCI compiler otherwise JVMCI
550 // compilations will not block until JVMCI is initialized
551 ResourceMark rm;
552 TempNewSymbol getCompiler = SymbolTable::new_symbol("getCompiler", CHECK);
553 TempNewSymbol sig = SymbolTable::new_symbol("()Ljdk/vm/ci/runtime/JVMCICompiler;", CHECK);
554 Handle jvmciRuntime = JVMCIRuntime::get_HotSpotJVMCIRuntime(CHECK);
555 JavaValue result(T_OBJECT);
556 JavaCalls::call_virtual(&result, jvmciRuntime, HotSpotJVMCIRuntime::klass(), getCompiler, sig, CHECK);
557 }
558 }
559 }
560 #endif // INCLUDE_JVMCI
561
562 #ifdef COMPILER1
563 if (c1_count > 0) {
564 _compilers[0] = new Compiler();
565 }
566 #endif // COMPILER1
567
568 #ifdef COMPILER2
569 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
570 if (c2_count > 0) {
571 _compilers[1] = new C2Compiler();
572 }
573 }
574 #endif // COMPILER2
575
576 #else // SHARK
577 int c1_count = 0;
578 int c2_count = 1;
579
580 _compilers[1] = new SharkCompiler();
581 #endif // SHARK
582
583 // Start the compiler thread(s) and the sweeper thread
584 init_compiler_sweeper_threads(c1_count, c2_count);
585 // totalTime performance counter is always created as it is required
586 // by the implementation of java.lang.management.CompilationMBean.
587 {
588 EXCEPTION_MARK;
589 _perf_total_compilation =
590 PerfDataManager::create_counter(JAVA_CI, "totalTime",
591 PerfData::U_Ticks, CHECK);
592 }
593
594 if (UsePerfData) {
595
596 EXCEPTION_MARK;
597
598 // create the jvmstat performance counters
599 _perf_osr_compilation =
600 PerfDataManager::create_counter(SUN_CI, "osrTime",
601 PerfData::U_Ticks, CHECK);
602
603 _perf_standard_compilation =
604 PerfDataManager::create_counter(SUN_CI, "standardTime",
605 PerfData::U_Ticks, CHECK);
606
607 _perf_total_bailout_count =
608 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
609 PerfData::U_Events, CHECK);
610
611 _perf_total_invalidated_count =
612 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
613 PerfData::U_Events, CHECK);
614
615 _perf_total_compile_count =
616 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
617 PerfData::U_Events, CHECK);
618 _perf_total_osr_compile_count =
619 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
620 PerfData::U_Events, CHECK);
621
622 _perf_total_standard_compile_count =
623 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
624 PerfData::U_Events, CHECK);
625
626 _perf_sum_osr_bytes_compiled =
627 PerfDataManager::create_counter(SUN_CI, "osrBytes",
628 PerfData::U_Bytes, CHECK);
629
630 _perf_sum_standard_bytes_compiled =
631 PerfDataManager::create_counter(SUN_CI, "standardBytes",
632 PerfData::U_Bytes, CHECK);
633
634 _perf_sum_nmethod_size =
635 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
636 PerfData::U_Bytes, CHECK);
637
638 _perf_sum_nmethod_code_size =
639 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
640 PerfData::U_Bytes, CHECK);
641
642 _perf_last_method =
643 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
644 CompilerCounters::cmname_buffer_length,
645 "", CHECK);
646
647 _perf_last_failed_method =
648 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
649 CompilerCounters::cmname_buffer_length,
650 "", CHECK);
651
652 _perf_last_invalidated_method =
653 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
654 CompilerCounters::cmname_buffer_length,
655 "", CHECK);
656
657 _perf_last_compile_type =
658 PerfDataManager::create_variable(SUN_CI, "lastType",
659 PerfData::U_None,
660 (jlong)CompileBroker::no_compile,
661 CHECK);
662
663 _perf_last_compile_size =
664 PerfDataManager::create_variable(SUN_CI, "lastSize",
665 PerfData::U_Bytes,
666 (jlong)CompileBroker::no_compile,
667 CHECK);
668
669
670 _perf_last_failed_type =
671 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
672 PerfData::U_None,
673 (jlong)CompileBroker::no_compile,
674 CHECK);
675
676 _perf_last_invalidated_type =
677 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
678 PerfData::U_None,
679 (jlong)CompileBroker::no_compile,
680 CHECK);
681 }
682
683 _initialized = true;
684 }
685
686
687 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
688 AbstractCompiler* comp, bool compiler_thread, TRAPS) {
689 JavaThread* thread = NULL;
690 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
691 instanceKlassHandle klass (THREAD, k);
692 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
693 Handle string = java_lang_String::create_from_str(name, CHECK_0);
694
695 // Initialize thread_oop to put it into the system threadGroup
696 Handle thread_group (THREAD, Universe::system_thread_group());
697 JavaValue result(T_VOID);
698 JavaCalls::call_special(&result, thread_oop,
699 klass,
700 vmSymbols::object_initializer_name(),
701 vmSymbols::threadgroup_string_void_signature(),
702 thread_group,
703 string,
704 CHECK_0);
705
706 {
707 MutexLocker mu(Threads_lock, THREAD);
708 if (compiler_thread) {
709 thread = new CompilerThread(queue, counters);
710 } else {
711 thread = new CodeCacheSweeperThread();
712 }
713 // At this point the new CompilerThread data-races with this startup
714 // thread (which I believe is the primoridal thread and NOT the VM
715 // thread). This means Java bytecodes being executed at startup can
716 // queue compile jobs which will run at whatever default priority the
717 // newly created CompilerThread runs at.
718
719
720 // At this point it may be possible that no osthread was created for the
721 // JavaThread due to lack of memory. We would have to throw an exception
722 // in that case. However, since this must work and we do not allow
723 // exceptions anyway, check and abort if this fails.
724
725 if (thread == NULL || thread->osthread() == NULL) {
726 vm_exit_during_initialization("java.lang.OutOfMemoryError",
727 os::native_thread_creation_failed_msg());
728 }
729
730 java_lang_Thread::set_thread(thread_oop(), thread);
731
732 // Note that this only sets the JavaThread _priority field, which by
733 // definition is limited to Java priorities and not OS priorities.
734 // The os-priority is set in the CompilerThread startup code itself
735
736 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
737
738 // Note that we cannot call os::set_priority because it expects Java
739 // priorities and we are *explicitly* using OS priorities so that it's
740 // possible to set the compiler thread priority higher than any Java
741 // thread.
742
743 int native_prio = CompilerThreadPriority;
744 if (native_prio == -1) {
745 if (UseCriticalCompilerThreadPriority) {
746 native_prio = os::java_to_os_priority[CriticalPriority];
747 } else {
748 native_prio = os::java_to_os_priority[NearMaxPriority];
749 }
750 }
751 os::set_native_priority(thread, native_prio);
752
753 java_lang_Thread::set_daemon(thread_oop());
754
755 thread->set_threadObj(thread_oop());
756 if (compiler_thread) {
757 thread->as_CompilerThread()->set_compiler(comp);
758 }
759 Threads::add(thread);
760 Thread::start(thread);
761 }
762
763 // Let go of Threads_lock before yielding
764 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
765
766 return thread;
767 }
768
769
770 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
771 EXCEPTION_MARK;
772 #if !defined(ZERO) && !defined(SHARK)
773 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
774 #endif // !ZERO && !SHARK
775 // Initialize the compilation queue
776 if (c2_compiler_count > 0) {
777 _c2_compile_queue = new CompileQueue("C2 compile queue");
778 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
779 }
780 if (c1_compiler_count > 0) {
781 _c1_compile_queue = new CompileQueue("C1 compile queue");
782 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
783 }
784
785 int compiler_count = c1_compiler_count + c2_compiler_count;
786
787 char name_buffer[256];
788 const bool compiler_thread = true;
789 for (int i = 0; i < c2_compiler_count; i++) {
790 // Create a name for our thread.
791 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
792 CompilerCounters* counters = new CompilerCounters();
793 // Shark and C2
794 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
795 }
796
797 for (int i = c2_compiler_count; i < compiler_count; i++) {
798 // Create a name for our thread.
799 sprintf(name_buffer, "C1 CompilerThread%d", i);
800 CompilerCounters* counters = new CompilerCounters();
801 // C1
802 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
803 }
804
805 if (UsePerfData) {
806 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
807 }
808
809 if (MethodFlushing) {
810 // Initialize the sweeper thread
811 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
812 }
813 }
814
815
816 /**
817 * Set the methods on the stack as on_stack so that redefine classes doesn't
818 * reclaim them. This method is executed at a safepoint.
819 */
820 void CompileBroker::mark_on_stack() {
821 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
822 // Since we are at a safepoint, we do not need a lock to access
823 // the compile queues.
824 if (_c2_compile_queue != NULL) {
825 _c2_compile_queue->mark_on_stack();
826 }
827 if (_c1_compile_queue != NULL) {
828 _c1_compile_queue->mark_on_stack();
829 }
830 }
831
832 // ------------------------------------------------------------------
833 // CompileBroker::compile_method
834 //
835 // Request compilation of a method.
836 void CompileBroker::compile_method_base(const methodHandle& method,
837 int osr_bci,
838 int comp_level,
839 const methodHandle& hot_method,
840 int hot_count,
841 const char* comment,
842 Thread* thread) {
843 // do nothing if compiler thread(s) is not available
844 if (!_initialized) {
845 return;
846 }
847
848 guarantee(!method->is_abstract(), "cannot compile abstract methods");
849 assert(method->method_holder()->is_instance_klass(),
850 "sanity check");
851 assert(!method->method_holder()->is_not_initialized(),
852 "method holder must be initialized");
853 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
854
855 if (CIPrintRequests) {
856 tty->print("request: ");
857 method->print_short_name(tty);
858 if (osr_bci != InvocationEntryBci) {
859 tty->print(" osr_bci: %d", osr_bci);
860 }
861 tty->print(" level: %d comment: %s count: %d", comp_level, comment, hot_count);
862 if (!hot_method.is_null()) {
863 tty->print(" hot: ");
864 if (hot_method() != method()) {
865 hot_method->print_short_name(tty);
866 } else {
867 tty->print("yes");
868 }
869 }
870 tty->cr();
871 }
872
873 // A request has been made for compilation. Before we do any
874 // real work, check to see if the method has been compiled
875 // in the meantime with a definitive result.
876 if (compilation_is_complete(method, osr_bci, comp_level)) {
877 return;
878 }
879
880 #ifndef PRODUCT
881 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
882 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
883 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
884 return;
885 }
886 }
887 #endif
888
889 // If this method is already in the compile queue, then
890 // we do not block the current thread.
891 if (compilation_is_in_queue(method)) {
892 // We may want to decay our counter a bit here to prevent
893 // multiple denied requests for compilation. This is an
894 // open compilation policy issue. Note: The other possibility,
895 // in the case that this is a blocking compile request, is to have
896 // all subsequent blocking requesters wait for completion of
897 // ongoing compiles. Note that in this case we'll need a protocol
898 // for freeing the associated compile tasks. [Or we could have
899 // a single static monitor on which all these waiters sleep.]
900 return;
901 }
902
903 // If the requesting thread is holding the pending list lock
904 // then we just return. We can't risk blocking while holding
905 // the pending list lock or a 3-way deadlock may occur
906 // between the reference handler thread, a GC (instigated
907 // by a compiler thread), and compiled method registration.
908 if (ReferencePendingListLocker::is_locked_by_self()) {
909 return;
910 }
911
912 if (TieredCompilation) {
913 // Tiered policy requires MethodCounters to exist before adding a method to
914 // the queue. Create if we don't have them yet.
915 method->get_method_counters(thread);
916 }
917
918 // Outputs from the following MutexLocker block:
919 CompileTask* task = NULL;
920 bool blocking = false;
921 CompileQueue* queue = compile_queue(comp_level);
922
923 // Acquire our lock.
924 {
925 MutexLocker locker(MethodCompileQueue_lock, thread);
926
927 // Make sure the method has not slipped into the queues since
928 // last we checked; note that those checks were "fast bail-outs".
929 // Here we need to be more careful, see 14012000 below.
930 if (compilation_is_in_queue(method)) {
931 return;
932 }
933
934 // We need to check again to see if the compilation has
935 // completed. A previous compilation may have registered
936 // some result.
937 if (compilation_is_complete(method, osr_bci, comp_level)) {
938 return;
939 }
940
941 // We now know that this compilation is not pending, complete,
942 // or prohibited. Assign a compile_id to this compilation
943 // and check to see if it is in our [Start..Stop) range.
944 int compile_id = assign_compile_id(method, osr_bci);
945 if (compile_id == 0) {
946 // The compilation falls outside the allowed range.
947 return;
948 }
949
950 // Should this thread wait for completion of the compile?
951 blocking = is_compile_blocking();
952
953 #if INCLUDE_JVMCI
954 if (UseJVMCICompiler) {
955 if (blocking) {
956 // Don't allow blocking compiles for requests triggered by JVMCI.
957 if (thread->is_Compiler_thread()) {
958 blocking = false;
959 }
960
961 // Don't allow blocking compiles if inside a class initializer or while performing class loading
962 vframeStream vfst((JavaThread*) thread);
963 for (; !vfst.at_end(); vfst.next()) {
964 if (vfst.method()->is_static_initializer() ||
965 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
966 vfst.method()->name() == vmSymbols::loadClass_name())) {
967 blocking = false;
968 break;
969 }
970 }
971
972 // Don't allow blocking compilation requests to JVMCI
973 // if JVMCI itself is not yet initialized
974 if (!JVMCIRuntime::is_HotSpotJVMCIRuntime_initialized() && compiler(comp_level)->is_jvmci()) {
975 blocking = false;
976 }
977
978 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
979 // to avoid deadlock between compiler thread(s) and threads run at shutdown
980 // such as the DestroyJavaVM thread.
981 if (JVMCIRuntime::shutdown_called()) {
982 blocking = false;
983 }
984 }
985 }
986 #endif // INCLUDE_JVMCI
987
988 // We will enter the compilation in the queue.
989 // 14012000: Note that this sets the queued_for_compile bits in
990 // the target method. We can now reason that a method cannot be
991 // queued for compilation more than once, as follows:
992 // Before a thread queues a task for compilation, it first acquires
993 // the compile queue lock, then checks if the method's queued bits
994 // are set or it has already been compiled. Thus there can not be two
995 // instances of a compilation task for the same method on the
996 // compilation queue. Consider now the case where the compilation
997 // thread has already removed a task for that method from the queue
998 // and is in the midst of compiling it. In this case, the
999 // queued_for_compile bits must be set in the method (and these
1000 // will be visible to the current thread, since the bits were set
1001 // under protection of the compile queue lock, which we hold now.
1002 // When the compilation completes, the compiler thread first sets
1003 // the compilation result and then clears the queued_for_compile
1004 // bits. Neither of these actions are protected by a barrier (or done
1005 // under the protection of a lock), so the only guarantee we have
1006 // (on machines with TSO (Total Store Order)) is that these values
1007 // will update in that order. As a result, the only combinations of
1008 // these bits that the current thread will see are, in temporal order:
1009 // <RESULT, QUEUE> :
1010 // <0, 1> : in compile queue, but not yet compiled
1011 // <1, 1> : compiled but queue bit not cleared
1012 // <1, 0> : compiled and queue bit cleared
1013 // Because we first check the queue bits then check the result bits,
1014 // we are assured that we cannot introduce a duplicate task.
1015 // Note that if we did the tests in the reverse order (i.e. check
1016 // result then check queued bit), we could get the result bit before
1017 // the compilation completed, and the queue bit after the compilation
1018 // completed, and end up introducing a "duplicate" (redundant) task.
1019 // In that case, the compiler thread should first check if a method
1020 // has already been compiled before trying to compile it.
1021 // NOTE: in the event that there are multiple compiler threads and
1022 // there is de-optimization/recompilation, things will get hairy,
1023 // and in that case it's best to protect both the testing (here) of
1024 // these bits, and their updating (here and elsewhere) under a
1025 // common lock.
1026 task = create_compile_task(queue,
1027 compile_id, method,
1028 osr_bci, comp_level,
1029 hot_method, hot_count, comment,
1030 blocking);
1031 }
1032
1033 if (blocking) {
1034 wait_for_completion(task);
1035 }
1036 }
1037
1038
1039 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1040 int comp_level,
1041 const methodHandle& hot_method, int hot_count,
1042 const char* comment, Thread* THREAD) {
1043 // make sure arguments make sense
1044 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1045 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1046 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1047 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1048 // allow any levels for WhiteBox
1049 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1050 // return quickly if possible
1051
1052 // lock, make sure that the compilation
1053 // isn't prohibited in a straightforward way.
1054 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1055 if (comp == NULL || !comp->can_compile_method(method) ||
1056 compilation_is_prohibited(method, osr_bci, comp_level)) {
1057 return NULL;
1058 }
1059
1060 if (osr_bci == InvocationEntryBci) {
1061 // standard compilation
1062 nmethod* method_code = method->code();
1063 if (method_code != NULL) {
1064 if (compilation_is_complete(method, osr_bci, comp_level)) {
1065 return method_code;
1066 }
1067 }
1068 if (method->is_not_compilable(comp_level)) {
1069 return NULL;
1070 }
1071 } else {
1072 // osr compilation
1073 #ifndef TIERED
1074 // seems like an assert of dubious value
1075 assert(comp_level == CompLevel_highest_tier,
1076 "all OSR compiles are assumed to be at a single compilation level");
1077 #endif // TIERED
1078 // We accept a higher level osr method
1079 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1080 if (nm != NULL) return nm;
1081 if (method->is_not_osr_compilable(comp_level)) return NULL;
1082 }
1083
1084 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1085 // some prerequisites that are compiler specific
1086 if (comp->is_c2() || comp->is_shark()) {
1087 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1088 // Resolve all classes seen in the signature of the method
1089 // we are compiling.
1090 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1091 }
1092
1093 // If the method is native, do the lookup in the thread requesting
1094 // the compilation. Native lookups can load code, which is not
1095 // permitted during compilation.
1096 //
1097 // Note: A native method implies non-osr compilation which is
1098 // checked with an assertion at the entry of this method.
1099 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1100 bool in_base_library;
1101 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1102 if (HAS_PENDING_EXCEPTION) {
1103 // In case of an exception looking up the method, we just forget
1104 // about it. The interpreter will kick-in and throw the exception.
1105 method->set_not_compilable(); // implies is_not_osr_compilable()
1106 CLEAR_PENDING_EXCEPTION;
1107 return NULL;
1108 }
1109 assert(method->has_native_function(), "must have native code by now");
1110 }
1111
1112 // RedefineClasses() has replaced this method; just return
1113 if (method->is_old()) {
1114 return NULL;
1115 }
1116
1117 // JVMTI -- post_compile_event requires jmethod_id() that may require
1118 // a lock the compiling thread can not acquire. Prefetch it here.
1119 if (JvmtiExport::should_post_compiled_method_load()) {
1120 method->jmethod_id();
1121 }
1122
1123 // do the compilation
1124 if (method->is_native()) {
1125 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1126 // The following native methods:
1127 //
1128 // java.lang.Float.intBitsToFloat
1129 // java.lang.Float.floatToRawIntBits
1130 // java.lang.Double.longBitsToDouble
1131 // java.lang.Double.doubleToRawLongBits
1132 //
1133 // are called through the interpreter even if interpreter native stubs
1134 // are not preferred (i.e., calling through adapter handlers is preferred).
1135 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1136 // if the version of the methods from the native libraries is called.
1137 // As the interpreter and the C2-intrinsified version of the methods preserves
1138 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1139 if ((UseSSE >= 1 &&
1140 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1141 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1142 (UseSSE >= 2 &&
1143 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1144 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1145 return NULL;
1146 }
1147
1148 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1149 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1150 //
1151 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1152 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1153 AdapterHandlerLibrary::create_native_wrapper(method);
1154 } else {
1155 return NULL;
1156 }
1157 } else {
1158 // If the compiler is shut off due to code cache getting full
1159 // fail out now so blocking compiles dont hang the java thread
1160 if (!should_compile_new_jobs()) {
1161 CompilationPolicy::policy()->delay_compilation(method());
1162 return NULL;
1163 }
1164 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1165 }
1166
1167 // return requested nmethod
1168 // We accept a higher level osr method
1169 if (osr_bci == InvocationEntryBci) {
1170 return method->code();
1171 }
1172 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1173 }
1174
1175
1176 // ------------------------------------------------------------------
1177 // CompileBroker::compilation_is_complete
1178 //
1179 // See if compilation of this method is already complete.
1180 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1181 int osr_bci,
1182 int comp_level) {
1183 bool is_osr = (osr_bci != standard_entry_bci);
1184 if (is_osr) {
1185 if (method->is_not_osr_compilable(comp_level)) {
1186 return true;
1187 } else {
1188 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1189 return (result != NULL);
1190 }
1191 } else {
1192 if (method->is_not_compilable(comp_level)) {
1193 return true;
1194 } else {
1195 nmethod* result = method->code();
1196 if (result == NULL) return false;
1197 return comp_level == result->comp_level();
1198 }
1199 }
1200 }
1201
1202
1203 /**
1204 * See if this compilation is already requested.
1205 *
1206 * Implementation note: there is only a single "is in queue" bit
1207 * for each method. This means that the check below is overly
1208 * conservative in the sense that an osr compilation in the queue
1209 * will block a normal compilation from entering the queue (and vice
1210 * versa). This can be remedied by a full queue search to disambiguate
1211 * cases. If it is deemed profitable, this may be done.
1212 */
1213 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1214 return method->queued_for_compilation();
1215 }
1216
1217 // ------------------------------------------------------------------
1218 // CompileBroker::compilation_is_prohibited
1219 //
1220 // See if this compilation is not allowed.
1221 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level) {
1222 bool is_native = method->is_native();
1223 // Some compilers may not support the compilation of natives.
1224 AbstractCompiler *comp = compiler(comp_level);
1225 if (is_native &&
1226 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1227 method->set_not_compilable_quietly(comp_level);
1228 return true;
1229 }
1230
1231 bool is_osr = (osr_bci != standard_entry_bci);
1232 // Some compilers may not support on stack replacement.
1233 if (is_osr &&
1234 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1235 method->set_not_osr_compilable(comp_level);
1236 return true;
1237 }
1238
1239 // Breaking the abstraction - directives are only used inside a compilation otherwise.
1240 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1241 bool excluded = directive->ExcludeOption;
1242 DirectivesStack::release(directive);
1243
1244 // The method may be explicitly excluded by the user.
1245 double scale;
1246 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1247 bool quietly = CompilerOracle::should_exclude_quietly();
1248 if (PrintCompilation && !quietly) {
1249 // This does not happen quietly...
1250 ResourceMark rm;
1251 tty->print("### Excluding %s:%s",
1252 method->is_native() ? "generation of native wrapper" : "compile",
1253 (method->is_static() ? " static" : ""));
1254 method->print_short_name(tty);
1255 tty->cr();
1256 }
1257 method->set_not_compilable(comp_level, !quietly, "excluded by CompileCommand");
1258 }
1259
1260 return false;
1261 }
1262
1263 /**
1264 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1265 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1266 * The function also allows to generate separate compilation IDs for OSR compilations.
1267 */
1268 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1269 #ifdef ASSERT
1270 bool is_osr = (osr_bci != standard_entry_bci);
1271 int id;
1272 if (method->is_native()) {
1273 assert(!is_osr, "can't be osr");
1274 // Adapters, native wrappers and method handle intrinsics
1275 // should be generated always.
1276 return Atomic::add(1, &_compilation_id);
1277 } else if (CICountOSR && is_osr) {
1278 id = Atomic::add(1, &_osr_compilation_id);
1279 if (CIStartOSR <= id && id < CIStopOSR) {
1280 return id;
1281 }
1282 } else {
1283 id = Atomic::add(1, &_compilation_id);
1284 if (CIStart <= id && id < CIStop) {
1285 return id;
1286 }
1287 }
1288
1289 // Method was not in the appropriate compilation range.
1290 method->set_not_compilable_quietly();
1291 return 0;
1292 #else
1293 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1294 // only _compilation_id is incremented.
1295 return Atomic::add(1, &_compilation_id);
1296 #endif
1297 }
1298
1299 // ------------------------------------------------------------------
1300 // CompileBroker::assign_compile_id_unlocked
1301 //
1302 // Public wrapper for assign_compile_id that acquires the needed locks
1303 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1304 MutexLocker locker(MethodCompileQueue_lock, thread);
1305 return assign_compile_id(method, osr_bci);
1306 }
1307
1308 /**
1309 * Should the current thread block until this compilation request
1310 * has been fulfilled?
1311 */
1312 bool CompileBroker::is_compile_blocking() {
1313 assert(!ReferencePendingListLocker::is_locked_by_self(), "possible deadlock");
1314 return !BackgroundCompilation;
1315 }
1316
1317
1318 // ------------------------------------------------------------------
1319 // CompileBroker::preload_classes
1320 void CompileBroker::preload_classes(const methodHandle& method, TRAPS) {
1321 // Move this code over from c1_Compiler.cpp
1322 ShouldNotReachHere();
1323 }
1324
1325
1326 // ------------------------------------------------------------------
1327 // CompileBroker::create_compile_task
1328 //
1329 // Create a CompileTask object representing the current request for
1330 // compilation. Add this task to the queue.
1331 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1332 int compile_id,
1333 const methodHandle& method,
1334 int osr_bci,
1335 int comp_level,
1336 const methodHandle& hot_method,
1337 int hot_count,
1338 const char* comment,
1339 bool blocking) {
1340 CompileTask* new_task = CompileTask::allocate();
1341 new_task->initialize(compile_id, method, osr_bci, comp_level,
1342 hot_method, hot_count, comment,
1343 blocking);
1344 queue->add(new_task);
1345 return new_task;
1346 }
1347
1348 #if INCLUDE_JVMCI
1349 // The number of milliseconds to wait before checking if
1350 // JVMCI compilation has made progress.
1351 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 500;
1352
1353 // The number of JVMCI compilation progress checks that must fail
1354 // before unblocking a thread waiting for a blocking compilation.
1355 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 5;
1356
1357 /**
1358 * Waits for a JVMCI compiler to complete a given task. This thread
1359 * waits until either the task completes or it sees no JVMCI compilation
1360 * progress for N consecutive milliseconds where N is
1361 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1362 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1363 *
1364 * @return true if this thread needs to free/recycle the task
1365 */
1366 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1367 MutexLocker waiter(task->lock(), thread);
1368 int progress_wait_attempts = 0;
1369 int methods_compiled = jvmci->methods_compiled();
1370 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1371 task->lock()->wait(!Mutex::_no_safepoint_check_flag, JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1372 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1373
1374 bool progress;
1375 if (jvmci_compiler_thread != NULL) {
1376 // If the JVMCI compiler thread is not blocked, we deem it to be making progress.
1377 progress = jvmci_compiler_thread->thread_state() != _thread_blocked;
1378 } else {
1379 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1380 // that all JVMCI compiler threads are blocked on. We use the counter for
1381 // successful JVMCI compilations to determine whether JVMCI compilation
1382 // is still making progress through the JVMCI compiler queue.
1383 progress = jvmci->methods_compiled() != methods_compiled;
1384 }
1385
1386 if (!progress) {
1387 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1388 if (PrintCompilation) {
1389 task->print(tty, "wait for blocking compilation timed out");
1390 }
1391 break;
1392 }
1393 } else {
1394 progress_wait_attempts = 0;
1395 if (jvmci_compiler_thread == NULL) {
1396 methods_compiled = jvmci->methods_compiled();
1397 }
1398 }
1399 }
1400 task->clear_waiter();
1401 return task->is_complete();
1402 }
1403 #endif
1404
1405 /**
1406 * Wait for the compilation task to complete.
1407 */
1408 void CompileBroker::wait_for_completion(CompileTask* task) {
1409 if (CIPrintCompileQueue) {
1410 ttyLocker ttyl;
1411 tty->print_cr("BLOCKING FOR COMPILE");
1412 }
1413
1414 assert(task->is_blocking(), "can only wait on blocking task");
1415
1416 JavaThread* thread = JavaThread::current();
1417 thread->set_blocked_on_compilation(true);
1418
1419 methodHandle method(thread, task->method());
1420 bool free_task;
1421 #if INCLUDE_JVMCI
1422 AbstractCompiler* comp = compiler(task->comp_level());
1423 if (comp->is_jvmci()) {
1424 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1425 } else
1426 #endif
1427 {
1428 MutexLocker waiter(task->lock(), thread);
1429 free_task = true;
1430 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1431 task->lock()->wait();
1432 }
1433 }
1434
1435 thread->set_blocked_on_compilation(false);
1436 if (free_task) {
1437 if (is_compilation_disabled_forever()) {
1438 CompileTask::free(task);
1439 return;
1440 }
1441
1442 // It is harmless to check this status without the lock, because
1443 // completion is a stable property (until the task object is recycled).
1444 assert(task->is_complete(), "Compilation should have completed");
1445 assert(task->code_handle() == NULL, "must be reset");
1446
1447 // By convention, the waiter is responsible for recycling a
1448 // blocking CompileTask. Since there is only one waiter ever
1449 // waiting on a CompileTask, we know that no one else will
1450 // be using this CompileTask; we can free it.
1451 CompileTask::free(task);
1452 }
1453 }
1454
1455 /**
1456 * Initialize compiler thread(s) + compiler object(s). The postcondition
1457 * of this function is that the compiler runtimes are initialized and that
1458 * compiler threads can start compiling.
1459 */
1460 bool CompileBroker::init_compiler_runtime() {
1461 CompilerThread* thread = CompilerThread::current();
1462 AbstractCompiler* comp = thread->compiler();
1463 // Final sanity check - the compiler object must exist
1464 guarantee(comp != NULL, "Compiler object must exist");
1465
1466 int system_dictionary_modification_counter;
1467 {
1468 MutexLocker locker(Compile_lock, thread);
1469 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1470 }
1471
1472 {
1473 // Must switch to native to allocate ci_env
1474 ThreadToNativeFromVM ttn(thread);
1475 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1476 // Cache Jvmti state
1477 ci_env.cache_jvmti_state();
1478 // Cache DTrace flags
1479 ci_env.cache_dtrace_flags();
1480
1481 // Switch back to VM state to do compiler initialization
1482 ThreadInVMfromNative tv(thread);
1483 ResetNoHandleMark rnhm;
1484
1485 if (!comp->is_shark()) {
1486 // Perform per-thread and global initializations
1487 comp->initialize();
1488 }
1489 }
1490
1491 if (comp->is_failed()) {
1492 disable_compilation_forever();
1493 // If compiler initialization failed, no compiler thread that is specific to a
1494 // particular compiler runtime will ever start to compile methods.
1495 shutdown_compiler_runtime(comp, thread);
1496 return false;
1497 }
1498
1499 // C1 specific check
1500 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1501 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1502 return false;
1503 }
1504
1505 return true;
1506 }
1507
1508 /**
1509 * If C1 and/or C2 initialization failed, we shut down all compilation.
1510 * We do this to keep things simple. This can be changed if it ever turns
1511 * out to be a problem.
1512 */
1513 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1514 // Free buffer blob, if allocated
1515 if (thread->get_buffer_blob() != NULL) {
1516 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1517 CodeCache::free(thread->get_buffer_blob());
1518 }
1519
1520 if (comp->should_perform_shutdown()) {
1521 // There are two reasons for shutting down the compiler
1522 // 1) compiler runtime initialization failed
1523 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1524 warning("%s initialization failed. Shutting down all compilers", comp->name());
1525
1526 // Only one thread per compiler runtime object enters here
1527 // Set state to shut down
1528 comp->set_shut_down();
1529
1530 // Delete all queued compilation tasks to make compiler threads exit faster.
1531 if (_c1_compile_queue != NULL) {
1532 _c1_compile_queue->free_all();
1533 }
1534
1535 if (_c2_compile_queue != NULL) {
1536 _c2_compile_queue->free_all();
1537 }
1538
1539 // Set flags so that we continue execution with using interpreter only.
1540 UseCompiler = false;
1541 UseInterpreter = true;
1542
1543 // We could delete compiler runtimes also. However, there are references to
1544 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1545 // fail. This can be done later if necessary.
1546 }
1547 }
1548
1549 // ------------------------------------------------------------------
1550 // CompileBroker::compiler_thread_loop
1551 //
1552 // The main loop run by a CompilerThread.
1553 void CompileBroker::compiler_thread_loop() {
1554 CompilerThread* thread = CompilerThread::current();
1555 CompileQueue* queue = thread->queue();
1556 // For the thread that initializes the ciObjectFactory
1557 // this resource mark holds all the shared objects
1558 ResourceMark rm;
1559
1560 // First thread to get here will initialize the compiler interface
1561
1562 if (!ciObjectFactory::is_initialized()) {
1563 ASSERT_IN_VM;
1564 MutexLocker only_one (CompileThread_lock, thread);
1565 if (!ciObjectFactory::is_initialized()) {
1566 ciObjectFactory::initialize();
1567 }
1568 }
1569
1570 // Open a log.
1571 if (LogCompilation) {
1572 init_compiler_thread_log();
1573 }
1574 CompileLog* log = thread->log();
1575 if (log != NULL) {
1576 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1577 thread->name(),
1578 os::current_thread_id(),
1579 os::current_process_id());
1580 log->stamp();
1581 log->end_elem();
1582 }
1583
1584 // If compiler thread/runtime initialization fails, exit the compiler thread
1585 if (!init_compiler_runtime()) {
1586 return;
1587 }
1588
1589 // Poll for new compilation tasks as long as the JVM runs. Compilation
1590 // should only be disabled if something went wrong while initializing the
1591 // compiler runtimes. This, in turn, should not happen. The only known case
1592 // when compiler runtime initialization fails is if there is not enough free
1593 // space in the code cache to generate the necessary stubs, etc.
1594 while (!is_compilation_disabled_forever()) {
1595 // We need this HandleMark to avoid leaking VM handles.
1596 HandleMark hm(thread);
1597
1598 CompileTask* task = queue->get();
1599 if (task == NULL) {
1600 continue;
1601 }
1602
1603 // Give compiler threads an extra quanta. They tend to be bursty and
1604 // this helps the compiler to finish up the job.
1605 if (CompilerThreadHintNoPreempt) {
1606 os::hint_no_preempt();
1607 }
1608
1609 // Assign the task to the current thread. Mark this compilation
1610 // thread as active for the profiler.
1611 CompileTaskWrapper ctw(task);
1612 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1613 task->set_code_handle(&result_handle);
1614 methodHandle method(thread, task->method());
1615
1616 // Never compile a method if breakpoints are present in it
1617 if (method()->number_of_breakpoints() == 0) {
1618 // Compile the method.
1619 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1620 invoke_compiler_on_method(task);
1621 } else {
1622 // After compilation is disabled, remove remaining methods from queue
1623 method->clear_queued_for_compilation();
1624 task->set_failure_reason("compilation is disabled");
1625 }
1626 }
1627 }
1628
1629 // Shut down compiler runtime
1630 shutdown_compiler_runtime(thread->compiler(), thread);
1631 }
1632
1633 // ------------------------------------------------------------------
1634 // CompileBroker::init_compiler_thread_log
1635 //
1636 // Set up state required by +LogCompilation.
1637 void CompileBroker::init_compiler_thread_log() {
1638 CompilerThread* thread = CompilerThread::current();
1639 char file_name[4*K];
1640 FILE* fp = NULL;
1641 intx thread_id = os::current_thread_id();
1642 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1643 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1644 if (dir == NULL) {
1645 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1646 thread_id, os::current_process_id());
1647 } else {
1648 jio_snprintf(file_name, sizeof(file_name),
1649 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1650 os::file_separator(), thread_id, os::current_process_id());
1651 }
1652
1653 fp = fopen(file_name, "wt");
1654 if (fp != NULL) {
1655 if (LogCompilation && Verbose) {
1656 tty->print_cr("Opening compilation log %s", file_name);
1657 }
1658 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1659 thread->init_log(log);
1660
1661 if (xtty != NULL) {
1662 ttyLocker ttyl;
1663 // Record any per thread log files
1664 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1665 }
1666 return;
1667 }
1668 }
1669 warning("Cannot open log file: %s", file_name);
1670 }
1671
1672 void CompileBroker::log_metaspace_failure() {
1673 const char* message = "some methods may not be compiled because metaspace "
1674 "is out of memory";
1675 if (_compilation_log != NULL) {
1676 _compilation_log->log_metaspace_failure(message);
1677 }
1678 if (PrintCompilation) {
1679 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1680 }
1681 }
1682
1683
1684 // ------------------------------------------------------------------
1685 // CompileBroker::set_should_block
1686 //
1687 // Set _should_block.
1688 // Call this from the VM, with Threads_lock held and a safepoint requested.
1689 void CompileBroker::set_should_block() {
1690 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1691 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1692 #ifndef PRODUCT
1693 if (PrintCompilation && (Verbose || WizardMode))
1694 tty->print_cr("notifying compiler thread pool to block");
1695 #endif
1696 _should_block = true;
1697 }
1698
1699 // ------------------------------------------------------------------
1700 // CompileBroker::maybe_block
1701 //
1702 // Call this from the compiler at convenient points, to poll for _should_block.
1703 void CompileBroker::maybe_block() {
1704 if (_should_block) {
1705 #ifndef PRODUCT
1706 if (PrintCompilation && (Verbose || WizardMode))
1707 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1708 #endif
1709 ThreadInVMfromNative tivfn(JavaThread::current());
1710 }
1711 }
1712
1713 // wrapper for CodeCache::print_summary()
1714 static void codecache_print(bool detailed)
1715 {
1716 ResourceMark rm;
1717 stringStream s;
1718 // Dump code cache into a buffer before locking the tty,
1719 {
1720 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1721 CodeCache::print_summary(&s, detailed);
1722 }
1723 ttyLocker ttyl;
1724 tty->print("%s", s.as_string());
1725 }
1726
1727 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, EventCompilation& event, bool success, ciEnv* ci_env) {
1728
1729 if (success) {
1730 task->mark_success();
1731 if (ci_env != NULL) {
1732 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
1733 }
1734 if (_compilation_log != NULL) {
1735 nmethod* code = task->code();
1736 if (code != NULL) {
1737 _compilation_log->log_nmethod(thread, code);
1738 }
1739 }
1740 }
1741
1742 // simulate crash during compilation
1743 assert(task->compile_id() != CICrashAt, "just as planned");
1744 if (event.should_commit()) {
1745 event.set_method(task->method());
1746 event.set_compileID(task->compile_id());
1747 event.set_compileLevel(task->comp_level());
1748 event.set_succeded(task->is_success());
1749 event.set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
1750 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1751 event.set_inlinedBytes(task->num_inlined_bytecodes());
1752 event.commit();
1753 }
1754 }
1755
1756 int DirectivesStack::_depth = 0;
1757 CompilerDirectives* DirectivesStack::_top = NULL;
1758 CompilerDirectives* DirectivesStack::_bottom = NULL;
1759
1760 // ------------------------------------------------------------------
1761 // CompileBroker::invoke_compiler_on_method
1762 //
1763 // Compile a method.
1764 //
1765 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1766 if (PrintCompilation) {
1767 ResourceMark rm;
1768 task->print_tty();
1769 }
1770 elapsedTimer time;
1771
1772 CompilerThread* thread = CompilerThread::current();
1773 ResourceMark rm(thread);
1774
1775 if (LogEvents) {
1776 _compilation_log->log_compile(thread, task);
1777 }
1778
1779 // Common flags.
1780 uint compile_id = task->compile_id();
1781 int osr_bci = task->osr_bci();
1782 bool is_osr = (osr_bci != standard_entry_bci);
1783 bool should_log = (thread->log() != NULL);
1784 bool should_break = false;
1785 int task_level = task->comp_level();
1786
1787 DirectiveSet* directive;
1788 {
1789 // create the handle inside it's own block so it can't
1790 // accidentally be referenced once the thread transitions to
1791 // native. The NoHandleMark before the transition should catch
1792 // any cases where this occurs in the future.
1793 methodHandle method(thread, task->method());
1794 assert(!method->is_native(), "no longer compile natives");
1795
1796 // Look up matching directives
1797 directive = DirectivesStack::getMatchingDirective(method, compiler(task_level));
1798
1799 // Save information about this method in case of failure.
1800 set_last_compile(thread, method, is_osr, task_level);
1801
1802 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1803 }
1804
1805 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
1806 if (should_log && !directive->LogOption) {
1807 should_log = false;
1808 }
1809
1810 // Allocate a new set of JNI handles.
1811 push_jni_handle_block();
1812 Method* target_handle = task->method();
1813 int compilable = ciEnv::MethodCompilable;
1814 const char* failure_reason = NULL;
1815 const char* retry_message = NULL;
1816 AbstractCompiler *comp = compiler(task_level);
1817
1818 int system_dictionary_modification_counter;
1819 {
1820 MutexLocker locker(Compile_lock, thread);
1821 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1822 }
1823 #if INCLUDE_JVMCI
1824 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
1825 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
1826
1827 TraceTime t1("compilation", &time);
1828 EventCompilation event;
1829
1830 JVMCIEnv env(task, system_dictionary_modification_counter);
1831 methodHandle method(thread, target_handle);
1832 jvmci->compile_method(method, osr_bci, &env);
1833
1834 post_compile(thread, task, event, task->code() != NULL, NULL);
1835
1836 failure_reason = env.failure_reason();
1837 if (!env.retryable()) {
1838 retry_message = "not retryable";
1839 compilable = ciEnv::MethodCompilable_not_at_tier;
1840 }
1841
1842 } else
1843 #endif // INCLUDE_JVMCI
1844 {
1845 NoHandleMark nhm;
1846 ThreadToNativeFromVM ttn(thread);
1847
1848 ciEnv ci_env(task, system_dictionary_modification_counter);
1849 if (should_break) {
1850 ci_env.set_break_at_compile(true);
1851 }
1852 if (should_log) {
1853 ci_env.set_log(thread->log());
1854 }
1855 assert(thread->env() == &ci_env, "set by ci_env");
1856 // The thread-env() field is cleared in ~CompileTaskWrapper.
1857
1858 // Cache Jvmti state
1859 ci_env.cache_jvmti_state();
1860
1861 // Cache DTrace flags
1862 ci_env.cache_dtrace_flags();
1863
1864 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1865
1866 TraceTime t1("compilation", &time);
1867 EventCompilation event;
1868
1869 if (comp == NULL) {
1870 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1871 } else {
1872 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1873 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1874 while (WhiteBox::compilation_locked) {
1875 locker.wait(Mutex::_no_safepoint_check_flag);
1876 }
1877 }
1878 comp->compile_method(&ci_env, target, osr_bci, directive);
1879 }
1880
1881 if (!ci_env.failing() && task->code() == NULL) {
1882 //assert(false, "compiler should always document failure");
1883 // The compiler elected, without comment, not to register a result.
1884 // Do not attempt further compilations of this method.
1885 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1886 }
1887
1888 // Copy this bit to the enclosing block:
1889 compilable = ci_env.compilable();
1890
1891 if (ci_env.failing()) {
1892 failure_reason = ci_env.failure_reason();
1893 retry_message = ci_env.retry_message();
1894 ci_env.report_failure(failure_reason);
1895 }
1896
1897 post_compile(thread, task, event, !ci_env.failing(), &ci_env);
1898 }
1899 // Remove the JNI handle block after the ciEnv destructor has run in
1900 // the previous block.
1901 pop_jni_handle_block();
1902
1903 if (failure_reason != NULL) {
1904 task->set_failure_reason(failure_reason);
1905 if (_compilation_log != NULL) {
1906 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
1907 }
1908 if (PrintCompilation) {
1909 FormatBufferResource msg = retry_message != NULL ?
1910 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
1911 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
1912 task->print(tty, msg);
1913 }
1914 }
1915
1916 methodHandle method(thread, task->method());
1917
1918 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1919
1920 collect_statistics(thread, time, task);
1921
1922 nmethod* nm = task->code();
1923 if (nm != NULL) {
1924 nm->maybe_print_nmethod(directive);
1925 }
1926 DirectivesStack::release(directive);
1927
1928 if (PrintCompilation && PrintCompilation2) {
1929 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
1930 tty->print("%4d ", compile_id); // print compilation number
1931 tty->print("%s ", (is_osr ? "%" : " "));
1932 if (task->code() != NULL) {
1933 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1934 }
1935 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1936 }
1937
1938 if (PrintCodeCacheOnCompilation)
1939 codecache_print(/* detailed= */ false);
1940
1941 // Disable compilation, if required.
1942 switch (compilable) {
1943 case ciEnv::MethodCompilable_never:
1944 if (is_osr)
1945 method->set_not_osr_compilable_quietly();
1946 else
1947 method->set_not_compilable_quietly();
1948 break;
1949 case ciEnv::MethodCompilable_not_at_tier:
1950 if (is_osr)
1951 method->set_not_osr_compilable_quietly(task_level);
1952 else
1953 method->set_not_compilable_quietly(task_level);
1954 break;
1955 }
1956
1957 // Note that the queued_for_compilation bits are cleared without
1958 // protection of a mutex. [They were set by the requester thread,
1959 // when adding the task to the compile queue -- at which time the
1960 // compile queue lock was held. Subsequently, we acquired the compile
1961 // queue lock to get this task off the compile queue; thus (to belabour
1962 // the point somewhat) our clearing of the bits must be occurring
1963 // only after the setting of the bits. See also 14012000 above.
1964 method->clear_queued_for_compilation();
1965
1966 #ifdef ASSERT
1967 if (CollectedHeap::fired_fake_oom()) {
1968 // The current compile received a fake OOM during compilation so
1969 // go ahead and exit the VM since the test apparently succeeded
1970 tty->print_cr("*** Shutting down VM after successful fake OOM");
1971 vm_exit(0);
1972 }
1973 #endif
1974 }
1975
1976 /**
1977 * The CodeCache is full. Print warning and disable compilation.
1978 * Schedule code cache cleaning so compilation can continue later.
1979 * This function needs to be called only from CodeCache::allocate(),
1980 * since we currently handle a full code cache uniformly.
1981 */
1982 void CompileBroker::handle_full_code_cache(int code_blob_type) {
1983 UseInterpreter = true;
1984 if (UseCompiler || AlwaysCompileLoopMethods ) {
1985 if (xtty != NULL) {
1986 ResourceMark rm;
1987 stringStream s;
1988 // Dump code cache state into a buffer before locking the tty,
1989 // because log_state() will use locks causing lock conflicts.
1990 CodeCache::log_state(&s);
1991 // Lock to prevent tearing
1992 ttyLocker ttyl;
1993 xtty->begin_elem("code_cache_full");
1994 xtty->print("%s", s.as_string());
1995 xtty->stamp();
1996 xtty->end_elem();
1997 }
1998
1999 #ifndef PRODUCT
2000 if (CompileTheWorld || ExitOnFullCodeCache) {
2001 codecache_print(/* detailed= */ true);
2002 before_exit(JavaThread::current());
2003 exit_globals(); // will delete tty
2004 vm_direct_exit(CompileTheWorld ? 0 : 1);
2005 }
2006 #endif
2007 if (UseCodeCacheFlushing) {
2008 // Since code cache is full, immediately stop new compiles
2009 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2010 NMethodSweeper::log_sweep("disable_compiler");
2011 }
2012 } else {
2013 disable_compilation_forever();
2014 }
2015
2016 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2017 }
2018 }
2019
2020 // ------------------------------------------------------------------
2021 // CompileBroker::set_last_compile
2022 //
2023 // Record this compilation for debugging purposes.
2024 void CompileBroker::set_last_compile(CompilerThread* thread, const methodHandle& method, bool is_osr, int comp_level) {
2025 ResourceMark rm;
2026 char* method_name = method->name()->as_C_string();
2027 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2028 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2029 char current_method[CompilerCounters::cmname_buffer_length];
2030 size_t maxLen = CompilerCounters::cmname_buffer_length;
2031
2032 if (UsePerfData) {
2033 const char* class_name = method->method_holder()->name()->as_C_string();
2034
2035 size_t s1len = strlen(class_name);
2036 size_t s2len = strlen(method_name);
2037
2038 // check if we need to truncate the string
2039 if (s1len + s2len + 2 > maxLen) {
2040
2041 // the strategy is to lop off the leading characters of the
2042 // class name and the trailing characters of the method name.
2043
2044 if (s2len + 2 > maxLen) {
2045 // lop of the entire class name string, let snprintf handle
2046 // truncation of the method name.
2047 class_name += s1len; // null string
2048 }
2049 else {
2050 // lop off the extra characters from the front of the class name
2051 class_name += ((s1len + s2len + 2) - maxLen);
2052 }
2053 }
2054
2055 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2056 }
2057
2058 if (CICountOSR && is_osr) {
2059 _last_compile_type = osr_compile;
2060 } else {
2061 _last_compile_type = normal_compile;
2062 }
2063 _last_compile_level = comp_level;
2064
2065 if (UsePerfData) {
2066 CompilerCounters* counters = thread->counters();
2067 counters->set_current_method(current_method);
2068 counters->set_compile_type((jlong)_last_compile_type);
2069 }
2070 }
2071
2072
2073 // ------------------------------------------------------------------
2074 // CompileBroker::push_jni_handle_block
2075 //
2076 // Push on a new block of JNI handles.
2077 void CompileBroker::push_jni_handle_block() {
2078 JavaThread* thread = JavaThread::current();
2079
2080 // Allocate a new block for JNI handles.
2081 // Inlined code from jni_PushLocalFrame()
2082 JNIHandleBlock* java_handles = thread->active_handles();
2083 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2084 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2085 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2086 thread->set_active_handles(compile_handles);
2087 }
2088
2089
2090 // ------------------------------------------------------------------
2091 // CompileBroker::pop_jni_handle_block
2092 //
2093 // Pop off the current block of JNI handles.
2094 void CompileBroker::pop_jni_handle_block() {
2095 JavaThread* thread = JavaThread::current();
2096
2097 // Release our JNI handle block
2098 JNIHandleBlock* compile_handles = thread->active_handles();
2099 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2100 thread->set_active_handles(java_handles);
2101 compile_handles->set_pop_frame_link(NULL);
2102 JNIHandleBlock::release_block(compile_handles, thread); // may block
2103 }
2104
2105 // ------------------------------------------------------------------
2106 // CompileBroker::collect_statistics
2107 //
2108 // Collect statistics about the compilation.
2109
2110 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2111 bool success = task->is_success();
2112 methodHandle method (thread, task->method());
2113 uint compile_id = task->compile_id();
2114 bool is_osr = (task->osr_bci() != standard_entry_bci);
2115 nmethod* code = task->code();
2116 CompilerCounters* counters = thread->counters();
2117
2118 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2119 MutexLocker locker(CompileStatistics_lock);
2120
2121 // _perf variables are production performance counters which are
2122 // updated regardless of the setting of the CITime and CITimeEach flags
2123 //
2124
2125 // account all time, including bailouts and failures in this counter;
2126 // C1 and C2 counters are counting both successful and unsuccessful compiles
2127 _t_total_compilation.add(time);
2128
2129 if (!success) {
2130 _total_bailout_count++;
2131 if (UsePerfData) {
2132 _perf_last_failed_method->set_value(counters->current_method());
2133 _perf_last_failed_type->set_value(counters->compile_type());
2134 _perf_total_bailout_count->inc();
2135 }
2136 _t_bailedout_compilation.add(time);
2137 } else if (code == NULL) {
2138 if (UsePerfData) {
2139 _perf_last_invalidated_method->set_value(counters->current_method());
2140 _perf_last_invalidated_type->set_value(counters->compile_type());
2141 _perf_total_invalidated_count->inc();
2142 }
2143 _total_invalidated_count++;
2144 _t_invalidated_compilation.add(time);
2145 } else {
2146 // Compilation succeeded
2147
2148 // update compilation ticks - used by the implementation of
2149 // java.lang.management.CompilationMBean
2150 _perf_total_compilation->inc(time.ticks());
2151 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2152
2153 if (CITime) {
2154 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2155 if (is_osr) {
2156 _t_osr_compilation.add(time);
2157 _sum_osr_bytes_compiled += bytes_compiled;
2158 } else {
2159 _t_standard_compilation.add(time);
2160 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2161 }
2162
2163 #if INCLUDE_JVMCI
2164 AbstractCompiler* comp = compiler(task->comp_level());
2165 if (comp) {
2166 CompilerStatistics* stats = comp->stats();
2167 if (stats) {
2168 if (is_osr) {
2169 stats->_osr.update(time, bytes_compiled);
2170 } else {
2171 stats->_standard.update(time, bytes_compiled);
2172 }
2173 stats->_nmethods_size += code->total_size();
2174 stats->_nmethods_code_size += code->insts_size();
2175 } else { // if (!stats)
2176 assert(false, "Compiler statistics object must exist");
2177 }
2178 } else { // if (!comp)
2179 assert(false, "Compiler object must exist");
2180 }
2181 #endif // INCLUDE_JVMCI
2182 }
2183
2184 if (UsePerfData) {
2185 // save the name of the last method compiled
2186 _perf_last_method->set_value(counters->current_method());
2187 _perf_last_compile_type->set_value(counters->compile_type());
2188 _perf_last_compile_size->set_value(method->code_size() +
2189 task->num_inlined_bytecodes());
2190 if (is_osr) {
2191 _perf_osr_compilation->inc(time.ticks());
2192 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2193 } else {
2194 _perf_standard_compilation->inc(time.ticks());
2195 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2196 }
2197 }
2198
2199 if (CITimeEach) {
2200 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2201 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2202 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2203 }
2204
2205 // Collect counts of successful compilations
2206 _sum_nmethod_size += code->total_size();
2207 _sum_nmethod_code_size += code->insts_size();
2208 _total_compile_count++;
2209
2210 if (UsePerfData) {
2211 _perf_sum_nmethod_size->inc( code->total_size());
2212 _perf_sum_nmethod_code_size->inc(code->insts_size());
2213 _perf_total_compile_count->inc();
2214 }
2215
2216 if (is_osr) {
2217 if (UsePerfData) _perf_total_osr_compile_count->inc();
2218 _total_osr_compile_count++;
2219 } else {
2220 if (UsePerfData) _perf_total_standard_compile_count->inc();
2221 _total_standard_compile_count++;
2222 }
2223 }
2224 // set the current method for the thread to null
2225 if (UsePerfData) counters->set_current_method("");
2226 }
2227
2228 const char* CompileBroker::compiler_name(int comp_level) {
2229 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2230 if (comp == NULL) {
2231 return "no compiler";
2232 } else {
2233 return (comp->name());
2234 }
2235 }
2236
2237 #if INCLUDE_JVMCI
2238 void CompileBroker::print_times(AbstractCompiler* comp) {
2239 CompilerStatistics* stats = comp->stats();
2240 if (stats) {
2241 tty->print_cr(" %s {speed: %d bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2242 comp->name(), stats->bytes_per_second(),
2243 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2244 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2245 stats->_nmethods_size, stats->_nmethods_code_size);
2246 } else { // if (!stats)
2247 assert(false, "Compiler statistics object must exist");
2248 }
2249 comp->print_timers();
2250 }
2251 #endif // INCLUDE_JVMCI
2252
2253 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2254 #if INCLUDE_JVMCI
2255 elapsedTimer standard_compilation;
2256 elapsedTimer total_compilation;
2257 elapsedTimer osr_compilation;
2258
2259 int standard_bytes_compiled = 0;
2260 int osr_bytes_compiled = 0;
2261
2262 int standard_compile_count = 0;
2263 int osr_compile_count = 0;
2264 int total_compile_count = 0;
2265
2266 int nmethods_size = 0;
2267 int nmethods_code_size = 0;
2268 bool printedHeader = false;
2269
2270 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2271 AbstractCompiler* comp = _compilers[i];
2272 if (comp != NULL) {
2273 if (per_compiler && aggregate && !printedHeader) {
2274 printedHeader = true;
2275 tty->cr();
2276 tty->print_cr("Individual compiler times (for compiled methods only)");
2277 tty->print_cr("------------------------------------------------");
2278 tty->cr();
2279 }
2280 CompilerStatistics* stats = comp->stats();
2281
2282 if (stats) {
2283 standard_compilation.add(stats->_standard._time);
2284 osr_compilation.add(stats->_osr._time);
2285
2286 standard_bytes_compiled += stats->_standard._bytes;
2287 osr_bytes_compiled += stats->_osr._bytes;
2288
2289 standard_compile_count += stats->_standard._count;
2290 osr_compile_count += stats->_osr._count;
2291
2292 nmethods_size += stats->_nmethods_size;
2293 nmethods_code_size += stats->_nmethods_code_size;
2294 } else { // if (!stats)
2295 assert(false, "Compiler statistics object must exist");
2296 }
2297
2298 if (per_compiler) {
2299 print_times(comp);
2300 }
2301 }
2302 }
2303 total_compile_count = osr_compile_count + standard_compile_count;
2304 total_compilation.add(osr_compilation);
2305 total_compilation.add(standard_compilation);
2306
2307 // In hosted mode, print the JVMCI compiler specific counters manually.
2308 if (!UseJVMCICompiler) {
2309 JVMCICompiler::print_compilation_timers();
2310 }
2311 #else // INCLUDE_JVMCI
2312 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2313 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2314 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2315
2316 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2317 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2318
2319 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2320 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2321 int total_compile_count = CompileBroker::_total_compile_count;
2322
2323 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2324 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2325 #endif // INCLUDE_JVMCI
2326
2327 if (!aggregate) {
2328 return;
2329 }
2330 tty->cr();
2331 tty->print_cr("Accumulated compiler times");
2332 tty->print_cr("----------------------------------------------------------");
2333 //0000000000111111111122222222223333333333444444444455555555556666666666
2334 //0123456789012345678901234567890123456789012345678901234567890123456789
2335 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2336 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2337 standard_compilation.seconds(),
2338 standard_compilation.seconds() / standard_compile_count);
2339 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2340 CompileBroker::_t_bailedout_compilation.seconds(),
2341 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2342 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2343 osr_compilation.seconds(),
2344 osr_compilation.seconds() / osr_compile_count);
2345 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2346 CompileBroker::_t_invalidated_compilation.seconds(),
2347 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2348
2349 AbstractCompiler *comp = compiler(CompLevel_simple);
2350 if (comp != NULL) {
2351 tty->cr();
2352 comp->print_timers();
2353 }
2354 comp = compiler(CompLevel_full_optimization);
2355 if (comp != NULL) {
2356 tty->cr();
2357 comp->print_timers();
2358 }
2359 tty->cr();
2360 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2361 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2362 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2363 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2364 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2365 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2366 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2367 double tcs = total_compilation.seconds();
2368 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2369 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2370 tty->cr();
2371 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2372 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2373 }
2374
2375 // Debugging output for failure
2376 void CompileBroker::print_last_compile() {
2377 if ( _last_compile_level != CompLevel_none &&
2378 compiler(_last_compile_level) != NULL &&
2379 _last_method_compiled != NULL &&
2380 _last_compile_type != no_compile) {
2381 if (_last_compile_type == osr_compile) {
2382 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2383 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2384 } else {
2385 tty->print_cr("Last parse: %d+++(%d) %s",
2386 _compilation_id, _last_compile_level, _last_method_compiled);
2387 }
2388 }
2389 }
2390