1 /*
2 * Copyright (c) 1999, 2010, 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/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodDataOop.hpp"
35 #include "oops/methodOop.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/interfaceSupport.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "utilities/dtrace.hpp"
47 #ifdef COMPILER1
48 #include "c1/c1_Compiler.hpp"
49 #endif
50 #ifdef COMPILER2
51 #include "opto/c2compiler.hpp"
52 #endif
53 #ifdef SHARK
54 #include "shark/sharkCompiler.hpp"
55 #endif
56
57 #ifdef DTRACE_ENABLED
58
59 // Only bother with this argument setup if dtrace is available
60
61 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
62 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
63 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
64 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
65
66 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method) \
67 { \
68 char* comp_name = (char*)(compiler)->name(); \
69 Symbol* klass_name = (method)->klass_name(); \
70 Symbol* name = (method)->name(); \
71 Symbol* signature = (method)->signature(); \
72 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
73 comp_name, strlen(comp_name), \
74 klass_name->bytes(), klass_name->utf8_length(), \
75 name->bytes(), name->utf8_length(), \
76 signature->bytes(), signature->utf8_length()); \
77 }
78
79 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success) \
80 { \
81 char* comp_name = (char*)(compiler)->name(); \
82 Symbol* klass_name = (method)->klass_name(); \
83 Symbol* name = (method)->name(); \
84 Symbol* signature = (method)->signature(); \
85 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
86 comp_name, strlen(comp_name), \
87 klass_name->bytes(), klass_name->utf8_length(), \
88 name->bytes(), name->utf8_length(), \
89 signature->bytes(), signature->utf8_length(), (success)); \
90 }
91
92 #else // ndef DTRACE_ENABLED
93
94 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)
95 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)
96
97 #endif // ndef DTRACE_ENABLED
98
99 bool CompileBroker::_initialized = false;
100 volatile bool CompileBroker::_should_block = false;
101 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
102
103 // The installed compiler(s)
104 AbstractCompiler* CompileBroker::_compilers[2];
105
106 // These counters are used for assigning id's to each compilation
107 uint CompileBroker::_compilation_id = 0;
108 uint CompileBroker::_osr_compilation_id = 0;
109
110 // Debugging information
111 int CompileBroker::_last_compile_type = no_compile;
112 int CompileBroker::_last_compile_level = CompLevel_none;
113 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
114
115 // Performance counters
116 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
117 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
118 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
119
120 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
121 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
122 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
123 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
124 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
125
126 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
127 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
128 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
129 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
130
131 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
132 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
133 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
134 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
135 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
136 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
137 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
138
139 // Timers and counters for generating statistics
140 elapsedTimer CompileBroker::_t_total_compilation;
141 elapsedTimer CompileBroker::_t_osr_compilation;
142 elapsedTimer CompileBroker::_t_standard_compilation;
143
144 int CompileBroker::_total_bailout_count = 0;
145 int CompileBroker::_total_invalidated_count = 0;
146 int CompileBroker::_total_compile_count = 0;
147 int CompileBroker::_total_osr_compile_count = 0;
148 int CompileBroker::_total_standard_compile_count = 0;
149
150 int CompileBroker::_sum_osr_bytes_compiled = 0;
151 int CompileBroker::_sum_standard_bytes_compiled = 0;
152 int CompileBroker::_sum_nmethod_size = 0;
153 int CompileBroker::_sum_nmethod_code_size = 0;
154
155 CompileQueue* CompileBroker::_c2_method_queue = NULL;
156 CompileQueue* CompileBroker::_c1_method_queue = NULL;
157 CompileTask* CompileBroker::_task_free_list = NULL;
158
159 GrowableArray<CompilerThread*>* CompileBroker::_method_threads = NULL;
160
161
162 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
163 CompilerThread* thread = CompilerThread::current();
164 thread->set_task(task);
165 CompileLog* log = thread->log();
166 if (log != NULL) task->log_task_start(log);
167 }
168
169 CompileTaskWrapper::~CompileTaskWrapper() {
170 CompilerThread* thread = CompilerThread::current();
171 CompileTask* task = thread->task();
172 CompileLog* log = thread->log();
173 if (log != NULL) task->log_task_done(log);
174 thread->set_task(NULL);
175 task->set_code_handle(NULL);
176 DEBUG_ONLY(thread->set_env((ciEnv*)badAddress));
177 if (task->is_blocking()) {
178 MutexLocker notifier(task->lock(), thread);
179 task->mark_complete();
180 // Notify the waiting thread that the compilation has completed.
181 task->lock()->notify_all();
182 } else {
183 task->mark_complete();
184
185 // By convention, the compiling thread is responsible for
186 // recycling a non-blocking CompileTask.
187 CompileBroker::free_task(task);
188 }
189 }
190
191
192 // ------------------------------------------------------------------
193 // CompileTask::initialize
194 void CompileTask::initialize(int compile_id,
195 methodHandle method,
196 int osr_bci,
197 int comp_level,
198 methodHandle hot_method,
199 int hot_count,
200 const char* comment,
201 bool is_blocking) {
202 assert(!_lock->is_locked(), "bad locking");
203
204 _compile_id = compile_id;
205 _method = JNIHandles::make_global(method);
206 _osr_bci = osr_bci;
207 _is_blocking = is_blocking;
208 _comp_level = comp_level;
209 _num_inlined_bytecodes = 0;
210
211 _is_complete = false;
212 _is_success = false;
213 _code_handle = NULL;
214
215 _hot_method = NULL;
216 _hot_count = hot_count;
217 _time_queued = 0; // tidy
218 _comment = comment;
219
220 if (LogCompilation) {
221 _time_queued = os::elapsed_counter();
222 if (hot_method.not_null()) {
223 if (hot_method == method) {
224 _hot_method = _method;
225 } else {
226 _hot_method = JNIHandles::make_global(hot_method);
227 }
228 }
229 }
230
231 _next = NULL;
232 }
233
234 // ------------------------------------------------------------------
235 // CompileTask::code/set_code
236 nmethod* CompileTask::code() const {
237 if (_code_handle == NULL) return NULL;
238 return _code_handle->code();
239 }
240 void CompileTask::set_code(nmethod* nm) {
241 if (_code_handle == NULL && nm == NULL) return;
242 guarantee(_code_handle != NULL, "");
243 _code_handle->set_code(nm);
244 if (nm == NULL) _code_handle = NULL; // drop the handle also
245 }
246
247 // ------------------------------------------------------------------
248 // CompileTask::free
249 void CompileTask::free() {
250 set_code(NULL);
251 assert(!_lock->is_locked(), "Should not be locked when freed");
252 if (_hot_method != NULL && _hot_method != _method) {
253 JNIHandles::destroy_global(_hot_method);
254 }
255 JNIHandles::destroy_global(_method);
256 }
257
258
259 // ------------------------------------------------------------------
260 // CompileTask::print
261 void CompileTask::print() {
262 tty->print("<CompileTask compile_id=%d ", _compile_id);
263 tty->print("method=");
264 ((methodOop)JNIHandles::resolve(_method))->print_name(tty);
265 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
266 _osr_bci, bool_to_str(_is_blocking),
267 bool_to_str(_is_complete), bool_to_str(_is_success));
268 }
269
270
271 void CompileTask::print_compilation(outputStream *st, methodOop method, char* method_name) {
272 nmethod::print_compilation(st, method_name,/*title*/ NULL, method,
273 is_blocking(), compile_id(), osr_bci(), comp_level());
274 }
275
276 // ------------------------------------------------------------------
277 // CompileTask::print_line_on_error
278 //
279 // This function is called by fatal error handler when the thread
280 // causing troubles is a compiler thread.
281 //
282 // Do not grab any lock, do not allocate memory.
283 //
284 // Otherwise it's the same as CompileTask::print_line()
285 //
286 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
287 methodOop method = (methodOop)JNIHandles::resolve(_method);
288 // print compiler name
289 st->print("%s:", CompileBroker::compiler(comp_level())->name());
290 char* method_name = NULL;
291 if (method != NULL) {
292 method_name = method->name_and_sig_as_C_string(buf, buflen);
293 }
294 print_compilation(st, method, method_name);
295 }
296
297 // ------------------------------------------------------------------
298 // CompileTask::print_line
299 void CompileTask::print_line() {
300 Thread *thread = Thread::current();
301 methodHandle method(thread,
302 (methodOop)JNIHandles::resolve(method_handle()));
303 ResourceMark rm(thread);
304
305 ttyLocker ttyl; // keep the following output all in one block
306
307 // print compiler name if requested
308 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler(comp_level())->name());
309 print_compilation(tty, method(), NULL);
310 }
311
312
313 // ------------------------------------------------------------------
314 // CompileTask::log_task
315 void CompileTask::log_task(xmlStream* log) {
316 Thread* thread = Thread::current();
317 methodHandle method(thread,
318 (methodOop)JNIHandles::resolve(method_handle()));
319 ResourceMark rm(thread);
320
321 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
322 if (_compile_id != 0) log->print(" compile_id='%d'", _compile_id);
323 if (_osr_bci != CompileBroker::standard_entry_bci) {
324 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
325 } // else compile_kind='c2c'
326 if (!method.is_null()) log->method(method);
327 if (_osr_bci != CompileBroker::standard_entry_bci) {
328 log->print(" osr_bci='%d'", _osr_bci);
329 }
330 if (_comp_level != CompLevel_highest_tier) {
331 log->print(" level='%d'", _comp_level);
332 }
333 if (_is_blocking) {
334 log->print(" blocking='1'");
335 }
336 log->stamp();
337 }
338
339
340 // ------------------------------------------------------------------
341 // CompileTask::log_task_queued
342 void CompileTask::log_task_queued() {
343 Thread* thread = Thread::current();
344 ttyLocker ttyl;
345 ResourceMark rm(thread);
346
347 xtty->begin_elem("task_queued");
348 log_task(xtty);
349 if (_comment != NULL) {
350 xtty->print(" comment='%s'", _comment);
351 }
352 if (_hot_method != NULL) {
353 methodHandle hot(thread,
354 (methodOop)JNIHandles::resolve(_hot_method));
355 methodHandle method(thread,
356 (methodOop)JNIHandles::resolve(_method));
357 if (hot() != method()) {
358 xtty->method(hot);
359 }
360 }
361 if (_hot_count != 0) {
362 xtty->print(" hot_count='%d'", _hot_count);
363 }
364 xtty->end_elem();
365 }
366
367
368 // ------------------------------------------------------------------
369 // CompileTask::log_task_start
370 void CompileTask::log_task_start(CompileLog* log) {
371 log->begin_head("task");
372 log_task(log);
373 log->end_head();
374 }
375
376
377 // ------------------------------------------------------------------
378 // CompileTask::log_task_done
379 void CompileTask::log_task_done(CompileLog* log) {
380 Thread* thread = Thread::current();
381 methodHandle method(thread,
382 (methodOop)JNIHandles::resolve(method_handle()));
383 ResourceMark rm(thread);
384
385 // <task_done ... stamp='1.234'> </task>
386 nmethod* nm = code();
387 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
388 _is_success, nm == NULL ? 0 : nm->content_size(),
389 method->invocation_count());
390 int bec = method->backedge_count();
391 if (bec != 0) log->print(" backedge_count='%d'", bec);
392 // Note: "_is_complete" is about to be set, but is not.
393 if (_num_inlined_bytecodes != 0) {
394 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
395 }
396 log->stamp();
397 log->end_elem();
398 log->tail("task");
399 log->clear_identities(); // next task will have different CI
400 if (log->unflushed_count() > 2000) {
401 log->flush();
402 }
403 log->mark_file_end();
404 }
405
406
407
408 // ------------------------------------------------------------------
409 // CompileQueue::add
410 //
411 // Add a CompileTask to a CompileQueue
412 void CompileQueue::add(CompileTask* task) {
413 assert(lock()->owned_by_self(), "must own lock");
414
415 task->set_next(NULL);
416 task->set_prev(NULL);
417
418 if (_last == NULL) {
419 // The compile queue is empty.
420 assert(_first == NULL, "queue is empty");
421 _first = task;
422 _last = task;
423 } else {
424 // Append the task to the queue.
425 assert(_last->next() == NULL, "not last");
426 _last->set_next(task);
427 task->set_prev(_last);
428 _last = task;
429 }
430 ++_size;
431
432 // Mark the method as being in the compile queue.
433 ((methodOop)JNIHandles::resolve(task->method_handle()))->set_queued_for_compilation();
434
435 if (CIPrintCompileQueue) {
436 print();
437 }
438
439 if (LogCompilation && xtty != NULL) {
440 task->log_task_queued();
441 }
442
443 // Notify CompilerThreads that a task is available.
444 lock()->notify_all();
445 }
446
447 // ------------------------------------------------------------------
448 // CompileQueue::get
449 //
450 // Get the next CompileTask from a CompileQueue
451 CompileTask* CompileQueue::get() {
452 NMethodSweeper::possibly_sweep();
453
454 MutexLocker locker(lock());
455 // Wait for an available CompileTask.
456 while (_first == NULL) {
457 // There is no work to be done right now. Wait.
458 if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() || CodeCache::needs_flushing())) {
459 // During the emergency sweeping periods, wake up and sweep occasionally
460 bool timedout = lock()->wait(!Mutex::_no_safepoint_check_flag, NmethodSweepCheckInterval*1000);
461 if (timedout) {
462 MutexUnlocker ul(lock());
463 // When otherwise not busy, run nmethod sweeping
464 NMethodSweeper::possibly_sweep();
465 }
466 } else {
467 // During normal operation no need to wake up on timer
468 lock()->wait();
469 }
470 }
471 CompileTask* task = CompilationPolicy::policy()->select_task(this);
472 remove(task);
473 return task;
474 }
475
476 void CompileQueue::remove(CompileTask* task)
477 {
478 assert(lock()->owned_by_self(), "must own lock");
479 if (task->prev() != NULL) {
480 task->prev()->set_next(task->next());
481 } else {
482 // max is the first element
483 assert(task == _first, "Sanity");
484 _first = task->next();
485 }
486
487 if (task->next() != NULL) {
488 task->next()->set_prev(task->prev());
489 } else {
490 // max is the last element
491 assert(task == _last, "Sanity");
492 _last = task->prev();
493 }
494 --_size;
495 }
496
497 // ------------------------------------------------------------------
498 // CompileQueue::print
499 void CompileQueue::print() {
500 tty->print_cr("Contents of %s", name());
501 tty->print_cr("----------------------");
502 CompileTask* task = _first;
503 while (task != NULL) {
504 task->print_line();
505 task = task->next();
506 }
507 tty->print_cr("----------------------");
508 }
509
510 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
511
512 _current_method[0] = '\0';
513 _compile_type = CompileBroker::no_compile;
514
515 if (UsePerfData) {
516 ResourceMark rm;
517
518 // create the thread instance name space string - don't create an
519 // instance subspace if instance is -1 - keeps the adapterThread
520 // counters from having a ".0" namespace.
521 const char* thread_i = (instance == -1) ? thread_name :
522 PerfDataManager::name_space(thread_name, instance);
523
524
525 char* name = PerfDataManager::counter_name(thread_i, "method");
526 _perf_current_method =
527 PerfDataManager::create_string_variable(SUN_CI, name,
528 cmname_buffer_length,
529 _current_method, CHECK);
530
531 name = PerfDataManager::counter_name(thread_i, "type");
532 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
533 PerfData::U_None,
534 (jlong)_compile_type,
535 CHECK);
536
537 name = PerfDataManager::counter_name(thread_i, "time");
538 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
539 PerfData::U_Ticks, CHECK);
540
541 name = PerfDataManager::counter_name(thread_i, "compiles");
542 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
543 PerfData::U_Events, CHECK);
544 }
545 }
546
547 // ------------------------------------------------------------------
548 // CompileBroker::compilation_init
549 //
550 // Initialize the Compilation object
551 void CompileBroker::compilation_init() {
552 _last_method_compiled[0] = '\0';
553
554 #ifndef SHARK
555 // Set the interface to the current compiler(s).
556 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
557 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
558 #ifdef COMPILER1
559 if (c1_count > 0) {
560 _compilers[0] = new Compiler();
561 }
562 #endif // COMPILER1
563
564 #ifdef COMPILER2
565 if (c2_count > 0) {
566 _compilers[1] = new C2Compiler();
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 // Initialize the CompileTask free list
578 _task_free_list = NULL;
579
580 // Start the CompilerThreads
581 init_compiler_threads(c1_count, c2_count);
582 // totalTime performance counter is always created as it is required
583 // by the implementation of java.lang.management.CompilationMBean.
584 {
585 EXCEPTION_MARK;
586 _perf_total_compilation =
587 PerfDataManager::create_counter(JAVA_CI, "totalTime",
588 PerfData::U_Ticks, CHECK);
589 }
590
591
592 if (UsePerfData) {
593
594 EXCEPTION_MARK;
595
596 // create the jvmstat performance counters
597 _perf_osr_compilation =
598 PerfDataManager::create_counter(SUN_CI, "osrTime",
599 PerfData::U_Ticks, CHECK);
600
601 _perf_standard_compilation =
602 PerfDataManager::create_counter(SUN_CI, "standardTime",
603 PerfData::U_Ticks, CHECK);
604
605 _perf_total_bailout_count =
606 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
607 PerfData::U_Events, CHECK);
608
609 _perf_total_invalidated_count =
610 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
611 PerfData::U_Events, CHECK);
612
613 _perf_total_compile_count =
614 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
615 PerfData::U_Events, CHECK);
616 _perf_total_osr_compile_count =
617 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
618 PerfData::U_Events, CHECK);
619
620 _perf_total_standard_compile_count =
621 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
622 PerfData::U_Events, CHECK);
623
624 _perf_sum_osr_bytes_compiled =
625 PerfDataManager::create_counter(SUN_CI, "osrBytes",
626 PerfData::U_Bytes, CHECK);
627
628 _perf_sum_standard_bytes_compiled =
629 PerfDataManager::create_counter(SUN_CI, "standardBytes",
630 PerfData::U_Bytes, CHECK);
631
632 _perf_sum_nmethod_size =
633 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
634 PerfData::U_Bytes, CHECK);
635
636 _perf_sum_nmethod_code_size =
637 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
638 PerfData::U_Bytes, CHECK);
639
640 _perf_last_method =
641 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
642 CompilerCounters::cmname_buffer_length,
643 "", CHECK);
644
645 _perf_last_failed_method =
646 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
647 CompilerCounters::cmname_buffer_length,
648 "", CHECK);
649
650 _perf_last_invalidated_method =
651 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
652 CompilerCounters::cmname_buffer_length,
653 "", CHECK);
654
655 _perf_last_compile_type =
656 PerfDataManager::create_variable(SUN_CI, "lastType",
657 PerfData::U_None,
658 (jlong)CompileBroker::no_compile,
659 CHECK);
660
661 _perf_last_compile_size =
662 PerfDataManager::create_variable(SUN_CI, "lastSize",
663 PerfData::U_Bytes,
664 (jlong)CompileBroker::no_compile,
665 CHECK);
666
667
668 _perf_last_failed_type =
669 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
670 PerfData::U_None,
671 (jlong)CompileBroker::no_compile,
672 CHECK);
673
674 _perf_last_invalidated_type =
675 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
676 PerfData::U_None,
677 (jlong)CompileBroker::no_compile,
678 CHECK);
679 }
680
681 _initialized = true;
682 }
683
684
685
686 // ------------------------------------------------------------------
687 // CompileBroker::make_compiler_thread
688 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, TRAPS) {
689 CompilerThread* compiler_thread = NULL;
690
691 klassOop k =
692 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
693 true, CHECK_0);
694 instanceKlassHandle klass (THREAD, k);
695 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
696 Handle string = java_lang_String::create_from_str(name, CHECK_0);
697
698 // Initialize thread_oop to put it into the system threadGroup
699 Handle thread_group (THREAD, Universe::system_thread_group());
700 JavaValue result(T_VOID);
701 JavaCalls::call_special(&result, thread_oop,
702 klass,
703 vmSymbols::object_initializer_name(),
704 vmSymbols::threadgroup_string_void_signature(),
705 thread_group,
706 string,
707 CHECK_0);
708
709 {
710 MutexLocker mu(Threads_lock, THREAD);
711 compiler_thread = new CompilerThread(queue, counters);
712 // At this point the new CompilerThread data-races with this startup
713 // thread (which I believe is the primoridal thread and NOT the VM
714 // thread). This means Java bytecodes being executed at startup can
715 // queue compile jobs which will run at whatever default priority the
716 // newly created CompilerThread runs at.
717
718
719 // At this point it may be possible that no osthread was created for the
720 // JavaThread due to lack of memory. We would have to throw an exception
721 // in that case. However, since this must work and we do not allow
722 // exceptions anyway, check and abort if this fails.
723
724 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
725 vm_exit_during_initialization("java.lang.OutOfMemoryError",
726 "unable to create new native thread");
727 }
728
729 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
730
731 // Note that this only sets the JavaThread _priority field, which by
732 // definition is limited to Java priorities and not OS priorities.
733 // The os-priority is set in the CompilerThread startup code itself
734 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
735 // CLEANUP PRIORITIES: This -if- statement hids a bug whereby the compiler
736 // threads never have their OS priority set. The assumption here is to
737 // enable the Performance group to do flag tuning, figure out a suitable
738 // CompilerThreadPriority, and then remove this 'if' statement (and
739 // comment) and unconditionally set the priority.
740
741 // Compiler Threads should be at the highest Priority
742 if ( CompilerThreadPriority != -1 )
743 os::set_native_priority( compiler_thread, CompilerThreadPriority );
744 else
745 os::set_native_priority( compiler_thread, os::java_to_os_priority[NearMaxPriority]);
746
747 // Note that I cannot call os::set_priority because it expects Java
748 // priorities and I am *explicitly* using OS priorities so that it's
749 // possible to set the compiler thread priority higher than any Java
750 // thread.
751
752 java_lang_Thread::set_daemon(thread_oop());
753
754 compiler_thread->set_threadObj(thread_oop());
755 Threads::add(compiler_thread);
756 Thread::start(compiler_thread);
757 }
758 // Let go of Threads_lock before yielding
759 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
760
761 return compiler_thread;
762 }
763
764
765 // ------------------------------------------------------------------
766 // CompileBroker::init_compiler_threads
767 //
768 // Initialize the compilation queue
769 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
770 EXCEPTION_MARK;
771 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
772 if (c2_compiler_count > 0) {
773 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
774 }
775 if (c1_compiler_count > 0) {
776 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
777 }
778
779 int compiler_count = c1_compiler_count + c2_compiler_count;
780
781 _method_threads =
782 new (ResourceObj::C_HEAP) GrowableArray<CompilerThread*>(compiler_count, true);
783
784 char name_buffer[256];
785 for (int i = 0; i < c2_compiler_count; i++) {
786 // Create a name for our thread.
787 sprintf(name_buffer, "C2 CompilerThread%d", i);
788 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
789 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
790 _method_threads->append(new_thread);
791 }
792
793 for (int i = c2_compiler_count; i < compiler_count; i++) {
794 // Create a name for our thread.
795 sprintf(name_buffer, "C1 CompilerThread%d", i);
796 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
797 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
798 _method_threads->append(new_thread);
799 }
800
801 if (UsePerfData) {
802 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
803 compiler_count, CHECK);
804 }
805 }
806
807 // ------------------------------------------------------------------
808 // CompileBroker::is_idle
809 bool CompileBroker::is_idle() {
810 if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
811 return false;
812 } else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
813 return false;
814 } else {
815 int num_threads = _method_threads->length();
816 for (int i=0; i<num_threads; i++) {
817 if (_method_threads->at(i)->task() != NULL) {
818 return false;
819 }
820 }
821
822 // No pending or active compilations.
823 return true;
824 }
825 }
826
827
828 // ------------------------------------------------------------------
829 // CompileBroker::compile_method
830 //
831 // Request compilation of a method.
832 void CompileBroker::compile_method_base(methodHandle method,
833 int osr_bci,
834 int comp_level,
835 methodHandle hot_method,
836 int hot_count,
837 const char* comment,
838 TRAPS) {
839 // do nothing if compiler thread(s) is not available
840 if (!_initialized ) {
841 return;
842 }
843
844 guarantee(!method->is_abstract(), "cannot compile abstract methods");
845 assert(method->method_holder()->klass_part()->oop_is_instance(),
846 "sanity check");
847 assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(),
848 "method holder must be initialized");
849
850 if (CIPrintRequests) {
851 tty->print("request: ");
852 method->print_short_name(tty);
853 if (osr_bci != InvocationEntryBci) {
854 tty->print(" osr_bci: %d", osr_bci);
855 }
856 tty->print(" comment: %s count: %d", comment, hot_count);
857 if (!hot_method.is_null()) {
858 tty->print(" hot: ");
859 if (hot_method() != method()) {
860 hot_method->print_short_name(tty);
861 } else {
862 tty->print("yes");
863 }
864 }
865 tty->cr();
866 }
867
868 // A request has been made for compilation. Before we do any
869 // real work, check to see if the method has been compiled
870 // in the meantime with a definitive result.
871 if (compilation_is_complete(method, osr_bci, comp_level)) {
872 return;
873 }
874
875
876 // If this method is already in the compile queue, then
877 // we do not block the current thread.
878 if (compilation_is_in_queue(method, osr_bci)) {
879 // We may want to decay our counter a bit here to prevent
880 // multiple denied requests for compilation. This is an
881 // open compilation policy issue. Note: The other possibility,
882 // in the case that this is a blocking compile request, is to have
883 // all subsequent blocking requesters wait for completion of
884 // ongoing compiles. Note that in this case we'll need a protocol
885 // for freeing the associated compile tasks. [Or we could have
886 // a single static monitor on which all these waiters sleep.]
887 return;
888 }
889
890 // Outputs from the following MutexLocker block:
891 CompileTask* task = NULL;
892 bool blocking = false;
893 CompileQueue* queue = compile_queue(comp_level);
894
895 // Acquire our lock.
896 {
897 MutexLocker locker(queue->lock(), THREAD);
898
899 // Make sure the method has not slipped into the queues since
900 // last we checked; note that those checks were "fast bail-outs".
901 // Here we need to be more careful, see 14012000 below.
902 if (compilation_is_in_queue(method, osr_bci)) {
903 return;
904 }
905
906 // We need to check again to see if the compilation has
907 // completed. A previous compilation may have registered
908 // some result.
909 if (compilation_is_complete(method, osr_bci, comp_level)) {
910 return;
911 }
912
913 // We now know that this compilation is not pending, complete,
914 // or prohibited. Assign a compile_id to this compilation
915 // and check to see if it is in our [Start..Stop) range.
916 uint compile_id = assign_compile_id(method, osr_bci);
917 if (compile_id == 0) {
918 // The compilation falls outside the allowed range.
919 return;
920 }
921
922 // Should this thread wait for completion of the compile?
923 blocking = is_compile_blocking(method, osr_bci);
924
925 // We will enter the compilation in the queue.
926 // 14012000: Note that this sets the queued_for_compile bits in
927 // the target method. We can now reason that a method cannot be
928 // queued for compilation more than once, as follows:
929 // Before a thread queues a task for compilation, it first acquires
930 // the compile queue lock, then checks if the method's queued bits
931 // are set or it has already been compiled. Thus there can not be two
932 // instances of a compilation task for the same method on the
933 // compilation queue. Consider now the case where the compilation
934 // thread has already removed a task for that method from the queue
935 // and is in the midst of compiling it. In this case, the
936 // queued_for_compile bits must be set in the method (and these
937 // will be visible to the current thread, since the bits were set
938 // under protection of the compile queue lock, which we hold now.
939 // When the compilation completes, the compiler thread first sets
940 // the compilation result and then clears the queued_for_compile
941 // bits. Neither of these actions are protected by a barrier (or done
942 // under the protection of a lock), so the only guarantee we have
943 // (on machines with TSO (Total Store Order)) is that these values
944 // will update in that order. As a result, the only combinations of
945 // these bits that the current thread will see are, in temporal order:
946 // <RESULT, QUEUE> :
947 // <0, 1> : in compile queue, but not yet compiled
948 // <1, 1> : compiled but queue bit not cleared
949 // <1, 0> : compiled and queue bit cleared
950 // Because we first check the queue bits then check the result bits,
951 // we are assured that we cannot introduce a duplicate task.
952 // Note that if we did the tests in the reverse order (i.e. check
953 // result then check queued bit), we could get the result bit before
954 // the compilation completed, and the queue bit after the compilation
955 // completed, and end up introducing a "duplicate" (redundant) task.
956 // In that case, the compiler thread should first check if a method
957 // has already been compiled before trying to compile it.
958 // NOTE: in the event that there are multiple compiler threads and
959 // there is de-optimization/recompilation, things will get hairy,
960 // and in that case it's best to protect both the testing (here) of
961 // these bits, and their updating (here and elsewhere) under a
962 // common lock.
963 task = create_compile_task(queue,
964 compile_id, method,
965 osr_bci, comp_level,
966 hot_method, hot_count, comment,
967 blocking);
968 }
969
970 if (blocking) {
971 wait_for_completion(task);
972 }
973 }
974
975
976 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
977 int comp_level,
978 methodHandle hot_method, int hot_count,
979 const char* comment, TRAPS) {
980 // make sure arguments make sense
981 assert(method->method_holder()->klass_part()->oop_is_instance(), "not an instance method");
982 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
983 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
984 assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(), "method holder must be initialized");
985
986 if (!TieredCompilation) {
987 comp_level = CompLevel_highest_tier;
988 }
989
990 // return quickly if possible
991
992 // lock, make sure that the compilation
993 // isn't prohibited in a straightforward way.
994
995 if (compiler(comp_level) == NULL || compilation_is_prohibited(method, osr_bci, comp_level)) {
996 return NULL;
997 }
998
999 if (osr_bci == InvocationEntryBci) {
1000 // standard compilation
1001 nmethod* method_code = method->code();
1002 if (method_code != NULL) {
1003 if (compilation_is_complete(method, osr_bci, comp_level)) {
1004 return method_code;
1005 }
1006 }
1007 if (method->is_not_compilable(comp_level)) return NULL;
1008
1009 if (UseCodeCacheFlushing) {
1010 nmethod* saved = CodeCache::find_and_remove_saved_code(method());
1011 if (saved != NULL) {
1012 method->set_code(method, saved);
1013 return saved;
1014 }
1015 }
1016
1017 } else {
1018 // osr compilation
1019 #ifndef TIERED
1020 // seems like an assert of dubious value
1021 assert(comp_level == CompLevel_highest_tier,
1022 "all OSR compiles are assumed to be at a single compilation lavel");
1023 #endif // TIERED
1024 // We accept a higher level osr method
1025 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1026 if (nm != NULL) return nm;
1027 if (method->is_not_osr_compilable()) return NULL;
1028 }
1029
1030 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1031 // some prerequisites that are compiler specific
1032 if (compiler(comp_level)->is_c2()) {
1033 method->constants()->resolve_string_constants(CHECK_0);
1034 // Resolve all classes seen in the signature of the method
1035 // we are compiling.
1036 methodOopDesc::load_signature_classes(method, CHECK_0);
1037 }
1038
1039 // If the method is native, do the lookup in the thread requesting
1040 // the compilation. Native lookups can load code, which is not
1041 // permitted during compilation.
1042 //
1043 // Note: A native method implies non-osr compilation which is
1044 // checked with an assertion at the entry of this method.
1045 if (method->is_native()) {
1046 bool in_base_library;
1047 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1048 if (HAS_PENDING_EXCEPTION) {
1049 // In case of an exception looking up the method, we just forget
1050 // about it. The interpreter will kick-in and throw the exception.
1051 method->set_not_compilable(); // implies is_not_osr_compilable()
1052 CLEAR_PENDING_EXCEPTION;
1053 return NULL;
1054 }
1055 assert(method->has_native_function(), "must have native code by now");
1056 }
1057
1058 // RedefineClasses() has replaced this method; just return
1059 if (method->is_old()) {
1060 return NULL;
1061 }
1062
1063 // JVMTI -- post_compile_event requires jmethod_id() that may require
1064 // a lock the compiling thread can not acquire. Prefetch it here.
1065 if (JvmtiExport::should_post_compiled_method_load()) {
1066 method->jmethod_id();
1067 }
1068
1069 // If the compiler is shut off due to code cache flushing or otherwise,
1070 // fail out now so blocking compiles dont hang the java thread
1071 if (!should_compile_new_jobs() || (UseCodeCacheFlushing && CodeCache::needs_flushing())) {
1072 CompilationPolicy::policy()->delay_compilation(method());
1073 return NULL;
1074 }
1075
1076 // do the compilation
1077 if (method->is_native()) {
1078 if (!PreferInterpreterNativeStubs) {
1079 (void) AdapterHandlerLibrary::create_native_wrapper(method);
1080 } else {
1081 return NULL;
1082 }
1083 } else {
1084 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, CHECK_0);
1085 }
1086
1087 // return requested nmethod
1088 // We accept a higher level osr method
1089 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1090 }
1091
1092
1093 // ------------------------------------------------------------------
1094 // CompileBroker::compilation_is_complete
1095 //
1096 // See if compilation of this method is already complete.
1097 bool CompileBroker::compilation_is_complete(methodHandle method,
1098 int osr_bci,
1099 int comp_level) {
1100 bool is_osr = (osr_bci != standard_entry_bci);
1101 if (is_osr) {
1102 if (method->is_not_osr_compilable()) {
1103 return true;
1104 } else {
1105 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1106 return (result != NULL);
1107 }
1108 } else {
1109 if (method->is_not_compilable(comp_level)) {
1110 return true;
1111 } else {
1112 nmethod* result = method->code();
1113 if (result == NULL) return false;
1114 return comp_level == result->comp_level();
1115 }
1116 }
1117 }
1118
1119
1120 // ------------------------------------------------------------------
1121 // CompileBroker::compilation_is_in_queue
1122 //
1123 // See if this compilation is already requested.
1124 //
1125 // Implementation note: there is only a single "is in queue" bit
1126 // for each method. This means that the check below is overly
1127 // conservative in the sense that an osr compilation in the queue
1128 // will block a normal compilation from entering the queue (and vice
1129 // versa). This can be remedied by a full queue search to disambiguate
1130 // cases. If it is deemed profitible, this may be done.
1131 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1132 int osr_bci) {
1133 return method->queued_for_compilation();
1134 }
1135
1136 // ------------------------------------------------------------------
1137 // CompileBroker::compilation_is_prohibited
1138 //
1139 // See if this compilation is not allowed.
1140 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1141 bool is_native = method->is_native();
1142 // Some compilers may not support the compilation of natives.
1143 if (is_native &&
1144 (!CICompileNatives || !compiler(comp_level)->supports_native())) {
1145 method->set_not_compilable_quietly(comp_level);
1146 return true;
1147 }
1148
1149 bool is_osr = (osr_bci != standard_entry_bci);
1150 // Some compilers may not support on stack replacement.
1151 if (is_osr &&
1152 (!CICompileOSR || !compiler(comp_level)->supports_osr())) {
1153 method->set_not_osr_compilable();
1154 return true;
1155 }
1156
1157 // The method may be explicitly excluded by the user.
1158 bool quietly;
1159 if (CompilerOracle::should_exclude(method, quietly)) {
1160 if (!quietly) {
1161 // This does not happen quietly...
1162 ResourceMark rm;
1163 tty->print("### Excluding %s:%s",
1164 method->is_native() ? "generation of native wrapper" : "compile",
1165 (method->is_static() ? " static" : ""));
1166 method->print_short_name(tty);
1167 tty->cr();
1168 }
1169 method->set_not_compilable_quietly();
1170 }
1171
1172 return false;
1173 }
1174
1175
1176 // ------------------------------------------------------------------
1177 // CompileBroker::assign_compile_id
1178 //
1179 // Assign a serialized id number to this compilation request. If the
1180 // number falls out of the allowed range, return a 0. OSR
1181 // compilations may be numbered separately from regular compilations
1182 // if certain debugging flags are used.
1183 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1184 assert(MethodCompileQueue_lock->owner() == Thread::current(),
1185 "must hold the compilation queue lock");
1186 bool is_osr = (osr_bci != standard_entry_bci);
1187 assert(!method->is_native(), "no longer compile natives");
1188 uint id;
1189 if (CICountOSR && is_osr) {
1190 id = ++_osr_compilation_id;
1191 if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1192 return id;
1193 }
1194 } else {
1195 id = ++_compilation_id;
1196 if ((uint)CIStart <= id && id < (uint)CIStop) {
1197 return id;
1198 }
1199 }
1200
1201 // Method was not in the appropriate compilation range.
1202 method->set_not_compilable_quietly();
1203 return 0;
1204 }
1205
1206
1207 // ------------------------------------------------------------------
1208 // CompileBroker::is_compile_blocking
1209 //
1210 // Should the current thread be blocked until this compilation request
1211 // has been fulfilled?
1212 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1213 return !BackgroundCompilation;
1214 }
1215
1216
1217 // ------------------------------------------------------------------
1218 // CompileBroker::preload_classes
1219 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1220 // Move this code over from c1_Compiler.cpp
1221 ShouldNotReachHere();
1222 }
1223
1224
1225 // ------------------------------------------------------------------
1226 // CompileBroker::create_compile_task
1227 //
1228 // Create a CompileTask object representing the current request for
1229 // compilation. Add this task to the queue.
1230 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1231 int compile_id,
1232 methodHandle method,
1233 int osr_bci,
1234 int comp_level,
1235 methodHandle hot_method,
1236 int hot_count,
1237 const char* comment,
1238 bool blocking) {
1239 CompileTask* new_task = allocate_task();
1240 new_task->initialize(compile_id, method, osr_bci, comp_level,
1241 hot_method, hot_count, comment,
1242 blocking);
1243 queue->add(new_task);
1244 return new_task;
1245 }
1246
1247
1248 // ------------------------------------------------------------------
1249 // CompileBroker::allocate_task
1250 //
1251 // Allocate a CompileTask, from the free list if possible.
1252 CompileTask* CompileBroker::allocate_task() {
1253 MutexLocker locker(CompileTaskAlloc_lock);
1254 CompileTask* task = NULL;
1255 if (_task_free_list != NULL) {
1256 task = _task_free_list;
1257 _task_free_list = task->next();
1258 task->set_next(NULL);
1259 } else {
1260 task = new CompileTask();
1261 task->set_next(NULL);
1262 }
1263 return task;
1264 }
1265
1266
1267 // ------------------------------------------------------------------
1268 // CompileBroker::free_task
1269 //
1270 // Add a task to the free list.
1271 void CompileBroker::free_task(CompileTask* task) {
1272 MutexLocker locker(CompileTaskAlloc_lock);
1273 task->free();
1274 task->set_next(_task_free_list);
1275 _task_free_list = task;
1276 }
1277
1278
1279 // ------------------------------------------------------------------
1280 // CompileBroker::wait_for_completion
1281 //
1282 // Wait for the given method CompileTask to complete.
1283 void CompileBroker::wait_for_completion(CompileTask* task) {
1284 if (CIPrintCompileQueue) {
1285 tty->print_cr("BLOCKING FOR COMPILE");
1286 }
1287
1288 assert(task->is_blocking(), "can only wait on blocking task");
1289
1290 JavaThread *thread = JavaThread::current();
1291 thread->set_blocked_on_compilation(true);
1292
1293 methodHandle method(thread,
1294 (methodOop)JNIHandles::resolve(task->method_handle()));
1295 {
1296 MutexLocker waiter(task->lock(), thread);
1297
1298 while (!task->is_complete())
1299 task->lock()->wait();
1300 }
1301 // It is harmless to check this status without the lock, because
1302 // completion is a stable property (until the task object is recycled).
1303 assert(task->is_complete(), "Compilation should have completed");
1304 assert(task->code_handle() == NULL, "must be reset");
1305
1306 thread->set_blocked_on_compilation(false);
1307
1308 // By convention, the waiter is responsible for recycling a
1309 // blocking CompileTask. Since there is only one waiter ever
1310 // waiting on a CompileTask, we know that no one else will
1311 // be using this CompileTask; we can free it.
1312 free_task(task);
1313 }
1314
1315 // ------------------------------------------------------------------
1316 // CompileBroker::compiler_thread_loop
1317 //
1318 // The main loop run by a CompilerThread.
1319 void CompileBroker::compiler_thread_loop() {
1320 CompilerThread* thread = CompilerThread::current();
1321 CompileQueue* queue = thread->queue();
1322
1323 // For the thread that initializes the ciObjectFactory
1324 // this resource mark holds all the shared objects
1325 ResourceMark rm;
1326
1327 // First thread to get here will initialize the compiler interface
1328
1329 if (!ciObjectFactory::is_initialized()) {
1330 ASSERT_IN_VM;
1331 MutexLocker only_one (CompileThread_lock, thread);
1332 if (!ciObjectFactory::is_initialized()) {
1333 ciObjectFactory::initialize();
1334 }
1335 }
1336
1337 // Open a log.
1338 if (LogCompilation) {
1339 init_compiler_thread_log();
1340 }
1341 CompileLog* log = thread->log();
1342 if (log != NULL) {
1343 log->begin_elem("start_compile_thread thread='" UINTX_FORMAT "' process='%d'",
1344 os::current_thread_id(),
1345 os::current_process_id());
1346 log->stamp();
1347 log->end_elem();
1348 }
1349
1350 while (true) {
1351 {
1352 // We need this HandleMark to avoid leaking VM handles.
1353 HandleMark hm(thread);
1354
1355 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1356 // the code cache is really full
1357 handle_full_code_cache();
1358 } else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
1359 // Attempt to start cleaning the code cache while there is still a little headroom
1360 NMethodSweeper::handle_full_code_cache(false);
1361 }
1362
1363 CompileTask* task = queue->get();
1364
1365 // Give compiler threads an extra quanta. They tend to be bursty and
1366 // this helps the compiler to finish up the job.
1367 if( CompilerThreadHintNoPreempt )
1368 os::hint_no_preempt();
1369
1370 // trace per thread time and compile statistics
1371 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1372 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1373
1374 // Assign the task to the current thread. Mark this compilation
1375 // thread as active for the profiler.
1376 CompileTaskWrapper ctw(task);
1377 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1378 task->set_code_handle(&result_handle);
1379 methodHandle method(thread,
1380 (methodOop)JNIHandles::resolve(task->method_handle()));
1381
1382 // Never compile a method if breakpoints are present in it
1383 if (method()->number_of_breakpoints() == 0) {
1384 // Compile the method.
1385 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1386 #ifdef COMPILER1
1387 // Allow repeating compilations for the purpose of benchmarking
1388 // compile speed. This is not useful for customers.
1389 if (CompilationRepeat != 0) {
1390 int compile_count = CompilationRepeat;
1391 while (compile_count > 0) {
1392 invoke_compiler_on_method(task);
1393 nmethod* nm = method->code();
1394 if (nm != NULL) {
1395 nm->make_zombie();
1396 method->clear_code();
1397 }
1398 compile_count--;
1399 }
1400 }
1401 #endif /* COMPILER1 */
1402 invoke_compiler_on_method(task);
1403 } else {
1404 // After compilation is disabled, remove remaining methods from queue
1405 method->clear_queued_for_compilation();
1406 }
1407 }
1408 }
1409 }
1410 }
1411
1412
1413 // ------------------------------------------------------------------
1414 // CompileBroker::init_compiler_thread_log
1415 //
1416 // Set up state required by +LogCompilation.
1417 void CompileBroker::init_compiler_thread_log() {
1418 CompilerThread* thread = CompilerThread::current();
1419 char fileBuf[4*K];
1420 FILE* fp = NULL;
1421 char* file = NULL;
1422 intx thread_id = os::current_thread_id();
1423 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1424 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1425 if (dir == NULL) {
1426 jio_snprintf(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
1427 thread_id, os::current_process_id());
1428 } else {
1429 jio_snprintf(fileBuf, sizeof(fileBuf),
1430 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1431 os::file_separator(), thread_id, os::current_process_id());
1432 }
1433 fp = fopen(fileBuf, "at");
1434 if (fp != NULL) {
1435 file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1);
1436 strcpy(file, fileBuf);
1437 break;
1438 }
1439 }
1440 if (fp == NULL) {
1441 warning("Cannot open log file: %s", fileBuf);
1442 } else {
1443 if (LogCompilation && Verbose)
1444 tty->print_cr("Opening compilation log %s", file);
1445 CompileLog* log = new(ResourceObj::C_HEAP) CompileLog(file, fp, thread_id);
1446 thread->init_log(log);
1447
1448 if (xtty != NULL) {
1449 ttyLocker ttyl;
1450
1451 // Record any per thread log files
1452 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file);
1453 }
1454 }
1455 }
1456
1457 // ------------------------------------------------------------------
1458 // CompileBroker::set_should_block
1459 //
1460 // Set _should_block.
1461 // Call this from the VM, with Threads_lock held and a safepoint requested.
1462 void CompileBroker::set_should_block() {
1463 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1464 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1465 #ifndef PRODUCT
1466 if (PrintCompilation && (Verbose || WizardMode))
1467 tty->print_cr("notifying compiler thread pool to block");
1468 #endif
1469 _should_block = true;
1470 }
1471
1472 // ------------------------------------------------------------------
1473 // CompileBroker::maybe_block
1474 //
1475 // Call this from the compiler at convenient points, to poll for _should_block.
1476 void CompileBroker::maybe_block() {
1477 if (_should_block) {
1478 #ifndef PRODUCT
1479 if (PrintCompilation && (Verbose || WizardMode))
1480 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1481 #endif
1482 ThreadInVMfromNative tivfn(JavaThread::current());
1483 }
1484 }
1485
1486
1487 // ------------------------------------------------------------------
1488 // CompileBroker::invoke_compiler_on_method
1489 //
1490 // Compile a method.
1491 //
1492 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1493 if (PrintCompilation) {
1494 ResourceMark rm;
1495 task->print_line();
1496 }
1497 elapsedTimer time;
1498
1499 CompilerThread* thread = CompilerThread::current();
1500 ResourceMark rm(thread);
1501
1502 // Common flags.
1503 uint compile_id = task->compile_id();
1504 int osr_bci = task->osr_bci();
1505 bool is_osr = (osr_bci != standard_entry_bci);
1506 bool should_log = (thread->log() != NULL);
1507 bool should_break = false;
1508 {
1509 // create the handle inside it's own block so it can't
1510 // accidentally be referenced once the thread transitions to
1511 // native. The NoHandleMark before the transition should catch
1512 // any cases where this occurs in the future.
1513 methodHandle method(thread,
1514 (methodOop)JNIHandles::resolve(task->method_handle()));
1515 should_break = check_break_at(method, compile_id, is_osr);
1516 if (should_log && !CompilerOracle::should_log(method)) {
1517 should_log = false;
1518 }
1519 assert(!method->is_native(), "no longer compile natives");
1520
1521 // Save information about this method in case of failure.
1522 set_last_compile(thread, method, is_osr, task->comp_level());
1523
1524 DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler(task->comp_level()), method);
1525 }
1526
1527 // Allocate a new set of JNI handles.
1528 push_jni_handle_block();
1529 jobject target_handle = JNIHandles::make_local(thread, JNIHandles::resolve(task->method_handle()));
1530 int compilable = ciEnv::MethodCompilable;
1531 {
1532 int system_dictionary_modification_counter;
1533 {
1534 MutexLocker locker(Compile_lock, thread);
1535 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1536 }
1537
1538 NoHandleMark nhm;
1539 ThreadToNativeFromVM ttn(thread);
1540
1541 ciEnv ci_env(task, system_dictionary_modification_counter);
1542 if (should_break) {
1543 ci_env.set_break_at_compile(true);
1544 }
1545 if (should_log) {
1546 ci_env.set_log(thread->log());
1547 }
1548 assert(thread->env() == &ci_env, "set by ci_env");
1549 // The thread-env() field is cleared in ~CompileTaskWrapper.
1550
1551 // Cache Jvmti state
1552 ci_env.cache_jvmti_state();
1553
1554 // Cache DTrace flags
1555 ci_env.cache_dtrace_flags();
1556
1557 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1558
1559 TraceTime t1("compilation", &time);
1560
1561 compiler(task->comp_level())->compile_method(&ci_env, target, osr_bci);
1562
1563 if (!ci_env.failing() && task->code() == NULL) {
1564 //assert(false, "compiler should always document failure");
1565 // The compiler elected, without comment, not to register a result.
1566 // Do not attempt further compilations of this method.
1567 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1568 }
1569
1570 if (ci_env.failing()) {
1571 // Copy this bit to the enclosing block:
1572 compilable = ci_env.compilable();
1573 if (PrintCompilation) {
1574 const char* reason = ci_env.failure_reason();
1575 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1576 tty->print_cr("%3d COMPILE SKIPPED: %s (retry at different tier)", compile_id, reason);
1577 } else if (compilable == ciEnv::MethodCompilable_never) {
1578 tty->print_cr("%3d COMPILE SKIPPED: %s (not retryable)", compile_id, reason);
1579 } else if (compilable == ciEnv::MethodCompilable) {
1580 tty->print_cr("%3d COMPILE SKIPPED: %s", compile_id, reason);
1581 }
1582 }
1583 } else {
1584 task->mark_success();
1585 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1586 }
1587 }
1588 pop_jni_handle_block();
1589
1590 methodHandle method(thread,
1591 (methodOop)JNIHandles::resolve(task->method_handle()));
1592
1593 DTRACE_METHOD_COMPILE_END_PROBE(compiler(task->comp_level()), method, task->is_success());
1594
1595 collect_statistics(thread, time, task);
1596
1597 if (compilable == ciEnv::MethodCompilable_never) {
1598 if (is_osr) {
1599 method->set_not_osr_compilable();
1600 } else {
1601 method->set_not_compilable_quietly();
1602 }
1603 } else if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1604 method->set_not_compilable_quietly(task->comp_level());
1605 }
1606
1607 // Note that the queued_for_compilation bits are cleared without
1608 // protection of a mutex. [They were set by the requester thread,
1609 // when adding the task to the complie queue -- at which time the
1610 // compile queue lock was held. Subsequently, we acquired the compile
1611 // queue lock to get this task off the compile queue; thus (to belabour
1612 // the point somewhat) our clearing of the bits must be occurring
1613 // only after the setting of the bits. See also 14012000 above.
1614 method->clear_queued_for_compilation();
1615
1616 #ifdef ASSERT
1617 if (CollectedHeap::fired_fake_oom()) {
1618 // The current compile received a fake OOM during compilation so
1619 // go ahead and exit the VM since the test apparently succeeded
1620 tty->print_cr("*** Shutting down VM after successful fake OOM");
1621 vm_exit(0);
1622 }
1623 #endif
1624 }
1625
1626 // ------------------------------------------------------------------
1627 // CompileBroker::handle_full_code_cache
1628 //
1629 // The CodeCache is full. Print out warning and disable compilation or
1630 // try code cache cleaning so compilation can continue later.
1631 void CompileBroker::handle_full_code_cache() {
1632 UseInterpreter = true;
1633 if (UseCompiler || AlwaysCompileLoopMethods ) {
1634 if (xtty != NULL) {
1635 xtty->begin_elem("code_cache_full");
1636 xtty->stamp();
1637 xtty->end_elem();
1638 }
1639 warning("CodeCache is full. Compiler has been disabled.");
1640 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1641 #ifndef PRODUCT
1642 if (CompileTheWorld || ExitOnFullCodeCache) {
1643 before_exit(JavaThread::current());
1644 exit_globals(); // will delete tty
1645 vm_direct_exit(CompileTheWorld ? 0 : 1);
1646 }
1647 #endif
1648 if (UseCodeCacheFlushing) {
1649 NMethodSweeper::handle_full_code_cache(true);
1650 } else {
1651 UseCompiler = false;
1652 AlwaysCompileLoopMethods = false;
1653 }
1654 }
1655 }
1656
1657 // ------------------------------------------------------------------
1658 // CompileBroker::set_last_compile
1659 //
1660 // Record this compilation for debugging purposes.
1661 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1662 ResourceMark rm;
1663 char* method_name = method->name()->as_C_string();
1664 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1665 char current_method[CompilerCounters::cmname_buffer_length];
1666 size_t maxLen = CompilerCounters::cmname_buffer_length;
1667
1668 if (UsePerfData) {
1669 const char* class_name = method->method_holder()->klass_part()->name()->as_C_string();
1670
1671 size_t s1len = strlen(class_name);
1672 size_t s2len = strlen(method_name);
1673
1674 // check if we need to truncate the string
1675 if (s1len + s2len + 2 > maxLen) {
1676
1677 // the strategy is to lop off the leading characters of the
1678 // class name and the trailing characters of the method name.
1679
1680 if (s2len + 2 > maxLen) {
1681 // lop of the entire class name string, let snprintf handle
1682 // truncation of the method name.
1683 class_name += s1len; // null string
1684 }
1685 else {
1686 // lop off the extra characters from the front of the class name
1687 class_name += ((s1len + s2len + 2) - maxLen);
1688 }
1689 }
1690
1691 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1692 }
1693
1694 if (CICountOSR && is_osr) {
1695 _last_compile_type = osr_compile;
1696 } else {
1697 _last_compile_type = normal_compile;
1698 }
1699 _last_compile_level = comp_level;
1700
1701 if (UsePerfData) {
1702 CompilerCounters* counters = thread->counters();
1703 counters->set_current_method(current_method);
1704 counters->set_compile_type((jlong)_last_compile_type);
1705 }
1706 }
1707
1708
1709 // ------------------------------------------------------------------
1710 // CompileBroker::push_jni_handle_block
1711 //
1712 // Push on a new block of JNI handles.
1713 void CompileBroker::push_jni_handle_block() {
1714 JavaThread* thread = JavaThread::current();
1715
1716 // Allocate a new block for JNI handles.
1717 // Inlined code from jni_PushLocalFrame()
1718 JNIHandleBlock* java_handles = thread->active_handles();
1719 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
1720 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
1721 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
1722 thread->set_active_handles(compile_handles);
1723 }
1724
1725
1726 // ------------------------------------------------------------------
1727 // CompileBroker::pop_jni_handle_block
1728 //
1729 // Pop off the current block of JNI handles.
1730 void CompileBroker::pop_jni_handle_block() {
1731 JavaThread* thread = JavaThread::current();
1732
1733 // Release our JNI handle block
1734 JNIHandleBlock* compile_handles = thread->active_handles();
1735 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
1736 thread->set_active_handles(java_handles);
1737 compile_handles->set_pop_frame_link(NULL);
1738 JNIHandleBlock::release_block(compile_handles, thread); // may block
1739 }
1740
1741
1742 // ------------------------------------------------------------------
1743 // CompileBroker::check_break_at
1744 //
1745 // Should the compilation break at the current compilation.
1746 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
1747 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
1748 return true;
1749 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
1750 return true;
1751 } else {
1752 return (compile_id == CIBreakAt);
1753 }
1754 }
1755
1756 // ------------------------------------------------------------------
1757 // CompileBroker::collect_statistics
1758 //
1759 // Collect statistics about the compilation.
1760
1761 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
1762 bool success = task->is_success();
1763 methodHandle method (thread, (methodOop)JNIHandles::resolve(task->method_handle()));
1764 uint compile_id = task->compile_id();
1765 bool is_osr = (task->osr_bci() != standard_entry_bci);
1766 nmethod* code = task->code();
1767 CompilerCounters* counters = thread->counters();
1768
1769 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
1770 MutexLocker locker(CompileStatistics_lock);
1771
1772 // _perf variables are production performance counters which are
1773 // updated regardless of the setting of the CITime and CITimeEach flags
1774 //
1775 if (!success) {
1776 _total_bailout_count++;
1777 if (UsePerfData) {
1778 _perf_last_failed_method->set_value(counters->current_method());
1779 _perf_last_failed_type->set_value(counters->compile_type());
1780 _perf_total_bailout_count->inc();
1781 }
1782 } else if (code == NULL) {
1783 if (UsePerfData) {
1784 _perf_last_invalidated_method->set_value(counters->current_method());
1785 _perf_last_invalidated_type->set_value(counters->compile_type());
1786 _perf_total_invalidated_count->inc();
1787 }
1788 _total_invalidated_count++;
1789 } else {
1790 // Compilation succeeded
1791
1792 // update compilation ticks - used by the implementation of
1793 // java.lang.management.CompilationMBean
1794 _perf_total_compilation->inc(time.ticks());
1795
1796 if (CITime) {
1797 _t_total_compilation.add(time);
1798 if (is_osr) {
1799 _t_osr_compilation.add(time);
1800 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1801 } else {
1802 _t_standard_compilation.add(time);
1803 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1804 }
1805 }
1806
1807 if (UsePerfData) {
1808 // save the name of the last method compiled
1809 _perf_last_method->set_value(counters->current_method());
1810 _perf_last_compile_type->set_value(counters->compile_type());
1811 _perf_last_compile_size->set_value(method->code_size() +
1812 task->num_inlined_bytecodes());
1813 if (is_osr) {
1814 _perf_osr_compilation->inc(time.ticks());
1815 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1816 } else {
1817 _perf_standard_compilation->inc(time.ticks());
1818 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1819 }
1820 }
1821
1822 if (CITimeEach) {
1823 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
1824 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
1825 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
1826 }
1827
1828 // Collect counts of successful compilations
1829 _sum_nmethod_size += code->total_size();
1830 _sum_nmethod_code_size += code->insts_size();
1831 _total_compile_count++;
1832
1833 if (UsePerfData) {
1834 _perf_sum_nmethod_size->inc( code->total_size());
1835 _perf_sum_nmethod_code_size->inc(code->insts_size());
1836 _perf_total_compile_count->inc();
1837 }
1838
1839 if (is_osr) {
1840 if (UsePerfData) _perf_total_osr_compile_count->inc();
1841 _total_osr_compile_count++;
1842 } else {
1843 if (UsePerfData) _perf_total_standard_compile_count->inc();
1844 _total_standard_compile_count++;
1845 }
1846 }
1847 // set the current method for the thread to null
1848 if (UsePerfData) counters->set_current_method("");
1849 }
1850
1851
1852
1853 void CompileBroker::print_times() {
1854 tty->cr();
1855 tty->print_cr("Accumulated compiler times (for compiled methods only)");
1856 tty->print_cr("------------------------------------------------");
1857 //0000000000111111111122222222223333333333444444444455555555556666666666
1858 //0123456789012345678901234567890123456789012345678901234567890123456789
1859 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
1860 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
1861 CompileBroker::_t_standard_compilation.seconds(),
1862 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
1863 tty->print_cr(" On stack replacement : %6.3f s, Average : %2.3f", CompileBroker::_t_osr_compilation.seconds(), CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
1864
1865 if (compiler(CompLevel_simple) != NULL) {
1866 compiler(CompLevel_simple)->print_timers();
1867 }
1868 if (compiler(CompLevel_full_optimization) != NULL) {
1869 compiler(CompLevel_full_optimization)->print_timers();
1870 }
1871 tty->cr();
1872 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
1873 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
1874 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
1875 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
1876 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
1877 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
1878 tty->cr();
1879 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
1880 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
1881 }
1882
1883
1884 // Debugging output for failure
1885 void CompileBroker::print_last_compile() {
1886 if ( _last_compile_level != CompLevel_none &&
1887 compiler(_last_compile_level) != NULL &&
1888 _last_method_compiled != NULL &&
1889 _last_compile_type != no_compile) {
1890 if (_last_compile_type == osr_compile) {
1891 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
1892 _osr_compilation_id, _last_compile_level, _last_method_compiled);
1893 } else {
1894 tty->print_cr("Last parse: %d+++(%d) %s",
1895 _compilation_id, _last_compile_level, _last_method_compiled);
1896 }
1897 }
1898 }
1899
1900
1901 void CompileBroker::print_compiler_threads_on(outputStream* st) {
1902 #ifndef PRODUCT
1903 st->print_cr("Compiler thread printing unimplemented.");
1904 st->cr();
1905 #endif
1906 }