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