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 #ifndef ZERO
772 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
773 #endif // !ZERO
774 if (c2_compiler_count > 0) {
775 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
776 }
777 if (c1_compiler_count > 0) {
778 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
779 }
780
781 int compiler_count = c1_compiler_count + c2_compiler_count;
782
783 _method_threads =
784 new (ResourceObj::C_HEAP) GrowableArray<CompilerThread*>(compiler_count, true);
785
786 char name_buffer[256];
787 for (int i = 0; i < c2_compiler_count; i++) {
788 // Create a name for our thread.
789 sprintf(name_buffer, "C2 CompilerThread%d", i);
790 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
791 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
792 _method_threads->append(new_thread);
793 }
794
795 for (int i = c2_compiler_count; i < compiler_count; i++) {
796 // Create a name for our thread.
797 sprintf(name_buffer, "C1 CompilerThread%d", i);
798 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
799 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
800 _method_threads->append(new_thread);
801 }
802
803 if (UsePerfData) {
804 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
805 compiler_count, CHECK);
806 }
807 }
808
809 // ------------------------------------------------------------------
810 // CompileBroker::is_idle
811 bool CompileBroker::is_idle() {
812 if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
813 return false;
814 } else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
815 return false;
816 } else {
817 int num_threads = _method_threads->length();
818 for (int i=0; i<num_threads; i++) {
819 if (_method_threads->at(i)->task() != NULL) {
820 return false;
821 }
822 }
823
824 // No pending or active compilations.
825 return true;
826 }
827 }
828
829
830 // ------------------------------------------------------------------
831 // CompileBroker::compile_method
832 //
833 // Request compilation of a method.
834 void CompileBroker::compile_method_base(methodHandle method,
835 int osr_bci,
836 int comp_level,
837 methodHandle hot_method,
838 int hot_count,
839 const char* comment,
840 TRAPS) {
841 // do nothing if compiler thread(s) is not available
842 if (!_initialized ) {
843 return;
844 }
845
846 guarantee(!method->is_abstract(), "cannot compile abstract methods");
847 assert(method->method_holder()->klass_part()->oop_is_instance(),
848 "sanity check");
849 assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(),
850 "method holder must be initialized");
851
852 if (CIPrintRequests) {
853 tty->print("request: ");
854 method->print_short_name(tty);
855 if (osr_bci != InvocationEntryBci) {
856 tty->print(" osr_bci: %d", osr_bci);
857 }
858 tty->print(" comment: %s count: %d", comment, hot_count);
859 if (!hot_method.is_null()) {
860 tty->print(" hot: ");
861 if (hot_method() != method()) {
862 hot_method->print_short_name(tty);
863 } else {
864 tty->print("yes");
865 }
866 }
867 tty->cr();
868 }
869
870 // A request has been made for compilation. Before we do any
871 // real work, check to see if the method has been compiled
872 // in the meantime with a definitive result.
873 if (compilation_is_complete(method, osr_bci, comp_level)) {
874 return;
875 }
876
877
878 // If this method is already in the compile queue, then
879 // we do not block the current thread.
880 if (compilation_is_in_queue(method, osr_bci)) {
881 // We may want to decay our counter a bit here to prevent
882 // multiple denied requests for compilation. This is an
883 // open compilation policy issue. Note: The other possibility,
884 // in the case that this is a blocking compile request, is to have
885 // all subsequent blocking requesters wait for completion of
886 // ongoing compiles. Note that in this case we'll need a protocol
887 // for freeing the associated compile tasks. [Or we could have
888 // a single static monitor on which all these waiters sleep.]
889 return;
890 }
891
892 // Outputs from the following MutexLocker block:
893 CompileTask* task = NULL;
894 bool blocking = false;
895 CompileQueue* queue = compile_queue(comp_level);
896
897 // Acquire our lock.
898 {
899 MutexLocker locker(queue->lock(), THREAD);
900
901 // Make sure the method has not slipped into the queues since
902 // last we checked; note that those checks were "fast bail-outs".
903 // Here we need to be more careful, see 14012000 below.
904 if (compilation_is_in_queue(method, osr_bci)) {
905 return;
906 }
907
908 // We need to check again to see if the compilation has
909 // completed. A previous compilation may have registered
910 // some result.
911 if (compilation_is_complete(method, osr_bci, comp_level)) {
912 return;
913 }
914
915 // We now know that this compilation is not pending, complete,
916 // or prohibited. Assign a compile_id to this compilation
917 // and check to see if it is in our [Start..Stop) range.
918 uint compile_id = assign_compile_id(method, osr_bci);
919 if (compile_id == 0) {
920 // The compilation falls outside the allowed range.
921 return;
922 }
923
924 // Should this thread wait for completion of the compile?
925 blocking = is_compile_blocking(method, osr_bci);
926
927 // We will enter the compilation in the queue.
928 // 14012000: Note that this sets the queued_for_compile bits in
929 // the target method. We can now reason that a method cannot be
930 // queued for compilation more than once, as follows:
931 // Before a thread queues a task for compilation, it first acquires
932 // the compile queue lock, then checks if the method's queued bits
933 // are set or it has already been compiled. Thus there can not be two
934 // instances of a compilation task for the same method on the
935 // compilation queue. Consider now the case where the compilation
936 // thread has already removed a task for that method from the queue
937 // and is in the midst of compiling it. In this case, the
938 // queued_for_compile bits must be set in the method (and these
939 // will be visible to the current thread, since the bits were set
940 // under protection of the compile queue lock, which we hold now.
941 // When the compilation completes, the compiler thread first sets
942 // the compilation result and then clears the queued_for_compile
943 // bits. Neither of these actions are protected by a barrier (or done
944 // under the protection of a lock), so the only guarantee we have
945 // (on machines with TSO (Total Store Order)) is that these values
946 // will update in that order. As a result, the only combinations of
947 // these bits that the current thread will see are, in temporal order:
948 // <RESULT, QUEUE> :
949 // <0, 1> : in compile queue, but not yet compiled
950 // <1, 1> : compiled but queue bit not cleared
951 // <1, 0> : compiled and queue bit cleared
952 // Because we first check the queue bits then check the result bits,
953 // we are assured that we cannot introduce a duplicate task.
954 // Note that if we did the tests in the reverse order (i.e. check
955 // result then check queued bit), we could get the result bit before
956 // the compilation completed, and the queue bit after the compilation
957 // completed, and end up introducing a "duplicate" (redundant) task.
958 // In that case, the compiler thread should first check if a method
959 // has already been compiled before trying to compile it.
960 // NOTE: in the event that there are multiple compiler threads and
961 // there is de-optimization/recompilation, things will get hairy,
962 // and in that case it's best to protect both the testing (here) of
963 // these bits, and their updating (here and elsewhere) under a
964 // common lock.
965 task = create_compile_task(queue,
966 compile_id, method,
967 osr_bci, comp_level,
968 hot_method, hot_count, comment,
969 blocking);
970 }
971
972 if (blocking) {
973 wait_for_completion(task);
974 }
975 }
976
977
978 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
979 int comp_level,
980 methodHandle hot_method, int hot_count,
981 const char* comment, TRAPS) {
982 // make sure arguments make sense
983 assert(method->method_holder()->klass_part()->oop_is_instance(), "not an instance method");
984 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
985 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
986 assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(), "method holder must be initialized");
987
988 if (!TieredCompilation) {
989 comp_level = CompLevel_highest_tier;
990 }
991
992 // return quickly if possible
993
994 // lock, make sure that the compilation
995 // isn't prohibited in a straightforward way.
996
997 if (compiler(comp_level) == NULL || compilation_is_prohibited(method, osr_bci, comp_level)) {
998 return NULL;
999 }
1000
1001 if (osr_bci == InvocationEntryBci) {
1002 // standard compilation
1003 nmethod* method_code = method->code();
1004 if (method_code != NULL) {
1005 if (compilation_is_complete(method, osr_bci, comp_level)) {
1006 return method_code;
1007 }
1008 }
1009 if (method->is_not_compilable(comp_level)) return NULL;
1010
1011 if (UseCodeCacheFlushing) {
1012 nmethod* saved = CodeCache::find_and_remove_saved_code(method());
1013 if (saved != NULL) {
1014 method->set_code(method, saved);
1015 return saved;
1016 }
1017 }
1018
1019 } else {
1020 // osr compilation
1021 #ifndef TIERED
1022 // seems like an assert of dubious value
1023 assert(comp_level == CompLevel_highest_tier,
1024 "all OSR compiles are assumed to be at a single compilation lavel");
1025 #endif // TIERED
1026 // We accept a higher level osr method
1027 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1028 if (nm != NULL) return nm;
1029 if (method->is_not_osr_compilable()) return NULL;
1030 }
1031
1032 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1033 // some prerequisites that are compiler specific
1034 if (compiler(comp_level)->is_c2()) {
1035 method->constants()->resolve_string_constants(CHECK_0);
1036 // Resolve all classes seen in the signature of the method
1037 // we are compiling.
1038 methodOopDesc::load_signature_classes(method, CHECK_0);
1039 }
1040
1041 // If the method is native, do the lookup in the thread requesting
1042 // the compilation. Native lookups can load code, which is not
1043 // permitted during compilation.
1044 //
1045 // Note: A native method implies non-osr compilation which is
1046 // checked with an assertion at the entry of this method.
1047 if (method->is_native()) {
1048 bool in_base_library;
1049 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1050 if (HAS_PENDING_EXCEPTION) {
1051 // In case of an exception looking up the method, we just forget
1052 // about it. The interpreter will kick-in and throw the exception.
1053 method->set_not_compilable(); // implies is_not_osr_compilable()
1054 CLEAR_PENDING_EXCEPTION;
1055 return NULL;
1056 }
1057 assert(method->has_native_function(), "must have native code by now");
1058 }
1059
1060 // RedefineClasses() has replaced this method; just return
1061 if (method->is_old()) {
1062 return NULL;
1063 }
1064
1065 // JVMTI -- post_compile_event requires jmethod_id() that may require
1066 // a lock the compiling thread can not acquire. Prefetch it here.
1067 if (JvmtiExport::should_post_compiled_method_load()) {
1068 method->jmethod_id();
1069 }
1070
1071 // If the compiler is shut off due to code cache flushing or otherwise,
1072 // fail out now so blocking compiles dont hang the java thread
1073 if (!should_compile_new_jobs() || (UseCodeCacheFlushing && CodeCache::needs_flushing())) {
1074 CompilationPolicy::policy()->delay_compilation(method());
1075 return NULL;
1076 }
1077
1078 // do the compilation
1079 if (method->is_native()) {
1080 if (!PreferInterpreterNativeStubs) {
1081 (void) AdapterHandlerLibrary::create_native_wrapper(method);
1082 } else {
1083 return NULL;
1084 }
1085 } else {
1086 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, CHECK_0);
1087 }
1088
1089 // return requested nmethod
1090 // We accept a higher level osr method
1091 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1092 }
1093
1094
1095 // ------------------------------------------------------------------
1096 // CompileBroker::compilation_is_complete
1097 //
1098 // See if compilation of this method is already complete.
1099 bool CompileBroker::compilation_is_complete(methodHandle method,
1100 int osr_bci,
1101 int comp_level) {
1102 bool is_osr = (osr_bci != standard_entry_bci);
1103 if (is_osr) {
1104 if (method->is_not_osr_compilable()) {
1105 return true;
1106 } else {
1107 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1108 return (result != NULL);
1109 }
1110 } else {
1111 if (method->is_not_compilable(comp_level)) {
1112 return true;
1113 } else {
1114 nmethod* result = method->code();
1115 if (result == NULL) return false;
1116 return comp_level == result->comp_level();
1117 }
1118 }
1119 }
1120
1121
1122 // ------------------------------------------------------------------
1123 // CompileBroker::compilation_is_in_queue
1124 //
1125 // See if this compilation is already requested.
1126 //
1127 // Implementation note: there is only a single "is in queue" bit
1128 // for each method. This means that the check below is overly
1129 // conservative in the sense that an osr compilation in the queue
1130 // will block a normal compilation from entering the queue (and vice
1131 // versa). This can be remedied by a full queue search to disambiguate
1132 // cases. If it is deemed profitible, this may be done.
1133 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1134 int osr_bci) {
1135 return method->queued_for_compilation();
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // CompileBroker::compilation_is_prohibited
1140 //
1141 // See if this compilation is not allowed.
1142 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1143 bool is_native = method->is_native();
1144 // Some compilers may not support the compilation of natives.
1145 if (is_native &&
1146 (!CICompileNatives || !compiler(comp_level)->supports_native())) {
1147 method->set_not_compilable_quietly(comp_level);
1148 return true;
1149 }
1150
1151 bool is_osr = (osr_bci != standard_entry_bci);
1152 // Some compilers may not support on stack replacement.
1153 if (is_osr &&
1154 (!CICompileOSR || !compiler(comp_level)->supports_osr())) {
1155 method->set_not_osr_compilable();
1156 return true;
1157 }
1158
1159 // The method may be explicitly excluded by the user.
1160 bool quietly;
1161 if (CompilerOracle::should_exclude(method, quietly)) {
1162 if (!quietly) {
1163 // This does not happen quietly...
1164 ResourceMark rm;
1165 tty->print("### Excluding %s:%s",
1166 method->is_native() ? "generation of native wrapper" : "compile",
1167 (method->is_static() ? " static" : ""));
1168 method->print_short_name(tty);
1169 tty->cr();
1170 }
1171 method->set_not_compilable_quietly();
1172 }
1173
1174 return false;
1175 }
1176
1177
1178 // ------------------------------------------------------------------
1179 // CompileBroker::assign_compile_id
1180 //
1181 // Assign a serialized id number to this compilation request. If the
1182 // number falls out of the allowed range, return a 0. OSR
1183 // compilations may be numbered separately from regular compilations
1184 // if certain debugging flags are used.
1185 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1186 assert(MethodCompileQueue_lock->owner() == Thread::current(),
1187 "must hold the compilation queue lock");
1188 bool is_osr = (osr_bci != standard_entry_bci);
1189 assert(!method->is_native(), "no longer compile natives");
1190 uint id;
1191 if (CICountOSR && is_osr) {
1192 id = ++_osr_compilation_id;
1193 if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1194 return id;
1195 }
1196 } else {
1197 id = ++_compilation_id;
1198 if ((uint)CIStart <= id && id < (uint)CIStop) {
1199 return id;
1200 }
1201 }
1202
1203 // Method was not in the appropriate compilation range.
1204 method->set_not_compilable_quietly();
1205 return 0;
1206 }
1207
1208
1209 // ------------------------------------------------------------------
1210 // CompileBroker::is_compile_blocking
1211 //
1212 // Should the current thread be blocked until this compilation request
1213 // has been fulfilled?
1214 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1215 return !BackgroundCompilation;
1216 }
1217
1218
1219 // ------------------------------------------------------------------
1220 // CompileBroker::preload_classes
1221 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1222 // Move this code over from c1_Compiler.cpp
1223 ShouldNotReachHere();
1224 }
1225
1226
1227 // ------------------------------------------------------------------
1228 // CompileBroker::create_compile_task
1229 //
1230 // Create a CompileTask object representing the current request for
1231 // compilation. Add this task to the queue.
1232 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1233 int compile_id,
1234 methodHandle method,
1235 int osr_bci,
1236 int comp_level,
1237 methodHandle hot_method,
1238 int hot_count,
1239 const char* comment,
1240 bool blocking) {
1241 CompileTask* new_task = allocate_task();
1242 new_task->initialize(compile_id, method, osr_bci, comp_level,
1243 hot_method, hot_count, comment,
1244 blocking);
1245 queue->add(new_task);
1246 return new_task;
1247 }
1248
1249
1250 // ------------------------------------------------------------------
1251 // CompileBroker::allocate_task
1252 //
1253 // Allocate a CompileTask, from the free list if possible.
1254 CompileTask* CompileBroker::allocate_task() {
1255 MutexLocker locker(CompileTaskAlloc_lock);
1256 CompileTask* task = NULL;
1257 if (_task_free_list != NULL) {
1258 task = _task_free_list;
1259 _task_free_list = task->next();
1260 task->set_next(NULL);
1261 } else {
1262 task = new CompileTask();
1263 task->set_next(NULL);
1264 }
1265 return task;
1266 }
1267
1268
1269 // ------------------------------------------------------------------
1270 // CompileBroker::free_task
1271 //
1272 // Add a task to the free list.
1273 void CompileBroker::free_task(CompileTask* task) {
1274 MutexLocker locker(CompileTaskAlloc_lock);
1275 task->free();
1276 task->set_next(_task_free_list);
1277 _task_free_list = task;
1278 }
1279
1280
1281 // ------------------------------------------------------------------
1282 // CompileBroker::wait_for_completion
1283 //
1284 // Wait for the given method CompileTask to complete.
1285 void CompileBroker::wait_for_completion(CompileTask* task) {
1286 if (CIPrintCompileQueue) {
1287 tty->print_cr("BLOCKING FOR COMPILE");
1288 }
1289
1290 assert(task->is_blocking(), "can only wait on blocking task");
1291
1292 JavaThread *thread = JavaThread::current();
1293 thread->set_blocked_on_compilation(true);
1294
1295 methodHandle method(thread,
1296 (methodOop)JNIHandles::resolve(task->method_handle()));
1297 {
1298 MutexLocker waiter(task->lock(), thread);
1299
1300 while (!task->is_complete())
1301 task->lock()->wait();
1302 }
1303 // It is harmless to check this status without the lock, because
1304 // completion is a stable property (until the task object is recycled).
1305 assert(task->is_complete(), "Compilation should have completed");
1306 assert(task->code_handle() == NULL, "must be reset");
1307
1308 thread->set_blocked_on_compilation(false);
1309
1310 // By convention, the waiter is responsible for recycling a
1311 // blocking CompileTask. Since there is only one waiter ever
1312 // waiting on a CompileTask, we know that no one else will
1313 // be using this CompileTask; we can free it.
1314 free_task(task);
1315 }
1316
1317 // ------------------------------------------------------------------
1318 // CompileBroker::compiler_thread_loop
1319 //
1320 // The main loop run by a CompilerThread.
1321 void CompileBroker::compiler_thread_loop() {
1322 CompilerThread* thread = CompilerThread::current();
1323 CompileQueue* queue = thread->queue();
1324
1325 // For the thread that initializes the ciObjectFactory
1326 // this resource mark holds all the shared objects
1327 ResourceMark rm;
1328
1329 // First thread to get here will initialize the compiler interface
1330
1331 if (!ciObjectFactory::is_initialized()) {
1332 ASSERT_IN_VM;
1333 MutexLocker only_one (CompileThread_lock, thread);
1334 if (!ciObjectFactory::is_initialized()) {
1335 ciObjectFactory::initialize();
1336 }
1337 }
1338
1339 // Open a log.
1340 if (LogCompilation) {
1341 init_compiler_thread_log();
1342 }
1343 CompileLog* log = thread->log();
1344 if (log != NULL) {
1345 log->begin_elem("start_compile_thread thread='" UINTX_FORMAT "' process='%d'",
1346 os::current_thread_id(),
1347 os::current_process_id());
1348 log->stamp();
1349 log->end_elem();
1350 }
1351
1352 while (true) {
1353 {
1354 // We need this HandleMark to avoid leaking VM handles.
1355 HandleMark hm(thread);
1356
1357 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1358 // the code cache is really full
1359 handle_full_code_cache();
1360 } else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
1361 // Attempt to start cleaning the code cache while there is still a little headroom
1362 NMethodSweeper::handle_full_code_cache(false);
1363 }
1364
1365 CompileTask* task = queue->get();
1366
1367 // Give compiler threads an extra quanta. They tend to be bursty and
1368 // this helps the compiler to finish up the job.
1369 if( CompilerThreadHintNoPreempt )
1370 os::hint_no_preempt();
1371
1372 // trace per thread time and compile statistics
1373 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1374 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1375
1376 // Assign the task to the current thread. Mark this compilation
1377 // thread as active for the profiler.
1378 CompileTaskWrapper ctw(task);
1379 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1380 task->set_code_handle(&result_handle);
1381 methodHandle method(thread,
1382 (methodOop)JNIHandles::resolve(task->method_handle()));
1383
1384 // Never compile a method if breakpoints are present in it
1385 if (method()->number_of_breakpoints() == 0) {
1386 // Compile the method.
1387 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1388 #ifdef COMPILER1
1389 // Allow repeating compilations for the purpose of benchmarking
1390 // compile speed. This is not useful for customers.
1391 if (CompilationRepeat != 0) {
1392 int compile_count = CompilationRepeat;
1393 while (compile_count > 0) {
1394 invoke_compiler_on_method(task);
1395 nmethod* nm = method->code();
1396 if (nm != NULL) {
1397 nm->make_zombie();
1398 method->clear_code();
1399 }
1400 compile_count--;
1401 }
1402 }
1403 #endif /* COMPILER1 */
1404 invoke_compiler_on_method(task);
1405 } else {
1406 // After compilation is disabled, remove remaining methods from queue
1407 method->clear_queued_for_compilation();
1408 }
1409 }
1410 }
1411 }
1412 }
1413
1414
1415 // ------------------------------------------------------------------
1416 // CompileBroker::init_compiler_thread_log
1417 //
1418 // Set up state required by +LogCompilation.
1419 void CompileBroker::init_compiler_thread_log() {
1420 CompilerThread* thread = CompilerThread::current();
1421 char fileBuf[4*K];
1422 FILE* fp = NULL;
1423 char* file = NULL;
1424 intx thread_id = os::current_thread_id();
1425 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1426 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1427 if (dir == NULL) {
1428 jio_snprintf(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
1429 thread_id, os::current_process_id());
1430 } else {
1431 jio_snprintf(fileBuf, sizeof(fileBuf),
1432 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1433 os::file_separator(), thread_id, os::current_process_id());
1434 }
1435 fp = fopen(fileBuf, "at");
1436 if (fp != NULL) {
1437 file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1);
1438 strcpy(file, fileBuf);
1439 break;
1440 }
1441 }
1442 if (fp == NULL) {
1443 warning("Cannot open log file: %s", fileBuf);
1444 } else {
1445 if (LogCompilation && Verbose)
1446 tty->print_cr("Opening compilation log %s", file);
1447 CompileLog* log = new(ResourceObj::C_HEAP) CompileLog(file, fp, thread_id);
1448 thread->init_log(log);
1449
1450 if (xtty != NULL) {
1451 ttyLocker ttyl;
1452
1453 // Record any per thread log files
1454 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file);
1455 }
1456 }
1457 }
1458
1459 // ------------------------------------------------------------------
1460 // CompileBroker::set_should_block
1461 //
1462 // Set _should_block.
1463 // Call this from the VM, with Threads_lock held and a safepoint requested.
1464 void CompileBroker::set_should_block() {
1465 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1466 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1467 #ifndef PRODUCT
1468 if (PrintCompilation && (Verbose || WizardMode))
1469 tty->print_cr("notifying compiler thread pool to block");
1470 #endif
1471 _should_block = true;
1472 }
1473
1474 // ------------------------------------------------------------------
1475 // CompileBroker::maybe_block
1476 //
1477 // Call this from the compiler at convenient points, to poll for _should_block.
1478 void CompileBroker::maybe_block() {
1479 if (_should_block) {
1480 #ifndef PRODUCT
1481 if (PrintCompilation && (Verbose || WizardMode))
1482 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1483 #endif
1484 ThreadInVMfromNative tivfn(JavaThread::current());
1485 }
1486 }
1487
1488
1489 // ------------------------------------------------------------------
1490 // CompileBroker::invoke_compiler_on_method
1491 //
1492 // Compile a method.
1493 //
1494 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1495 if (PrintCompilation) {
1496 ResourceMark rm;
1497 task->print_line();
1498 }
1499 elapsedTimer time;
1500
1501 CompilerThread* thread = CompilerThread::current();
1502 ResourceMark rm(thread);
1503
1504 // Common flags.
1505 uint compile_id = task->compile_id();
1506 int osr_bci = task->osr_bci();
1507 bool is_osr = (osr_bci != standard_entry_bci);
1508 bool should_log = (thread->log() != NULL);
1509 bool should_break = false;
1510 {
1511 // create the handle inside it's own block so it can't
1512 // accidentally be referenced once the thread transitions to
1513 // native. The NoHandleMark before the transition should catch
1514 // any cases where this occurs in the future.
1515 methodHandle method(thread,
1516 (methodOop)JNIHandles::resolve(task->method_handle()));
1517 should_break = check_break_at(method, compile_id, is_osr);
1518 if (should_log && !CompilerOracle::should_log(method)) {
1519 should_log = false;
1520 }
1521 assert(!method->is_native(), "no longer compile natives");
1522
1523 // Save information about this method in case of failure.
1524 set_last_compile(thread, method, is_osr, task->comp_level());
1525
1526 DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler(task->comp_level()), method);
1527 }
1528
1529 // Allocate a new set of JNI handles.
1530 push_jni_handle_block();
1531 jobject target_handle = JNIHandles::make_local(thread, JNIHandles::resolve(task->method_handle()));
1532 int compilable = ciEnv::MethodCompilable;
1533 {
1534 int system_dictionary_modification_counter;
1535 {
1536 MutexLocker locker(Compile_lock, thread);
1537 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1538 }
1539
1540 NoHandleMark nhm;
1541 ThreadToNativeFromVM ttn(thread);
1542
1543 ciEnv ci_env(task, system_dictionary_modification_counter);
1544 if (should_break) {
1545 ci_env.set_break_at_compile(true);
1546 }
1547 if (should_log) {
1548 ci_env.set_log(thread->log());
1549 }
1550 assert(thread->env() == &ci_env, "set by ci_env");
1551 // The thread-env() field is cleared in ~CompileTaskWrapper.
1552
1553 // Cache Jvmti state
1554 ci_env.cache_jvmti_state();
1555
1556 // Cache DTrace flags
1557 ci_env.cache_dtrace_flags();
1558
1559 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1560
1561 TraceTime t1("compilation", &time);
1562
1563 compiler(task->comp_level())->compile_method(&ci_env, target, osr_bci);
1564
1565 if (!ci_env.failing() && task->code() == NULL) {
1566 //assert(false, "compiler should always document failure");
1567 // The compiler elected, without comment, not to register a result.
1568 // Do not attempt further compilations of this method.
1569 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1570 }
1571
1572 if (ci_env.failing()) {
1573 // Copy this bit to the enclosing block:
1574 compilable = ci_env.compilable();
1575 if (PrintCompilation) {
1576 const char* reason = ci_env.failure_reason();
1577 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1578 tty->print_cr("%3d COMPILE SKIPPED: %s (retry at different tier)", compile_id, reason);
1579 } else if (compilable == ciEnv::MethodCompilable_never) {
1580 tty->print_cr("%3d COMPILE SKIPPED: %s (not retryable)", compile_id, reason);
1581 } else if (compilable == ciEnv::MethodCompilable) {
1582 tty->print_cr("%3d COMPILE SKIPPED: %s", compile_id, reason);
1583 }
1584 }
1585 } else {
1586 task->mark_success();
1587 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1588 }
1589 }
1590 pop_jni_handle_block();
1591
1592 methodHandle method(thread,
1593 (methodOop)JNIHandles::resolve(task->method_handle()));
1594
1595 DTRACE_METHOD_COMPILE_END_PROBE(compiler(task->comp_level()), method, task->is_success());
1596
1597 collect_statistics(thread, time, task);
1598
1599 if (compilable == ciEnv::MethodCompilable_never) {
1600 if (is_osr) {
1601 method->set_not_osr_compilable();
1602 } else {
1603 method->set_not_compilable_quietly();
1604 }
1605 } else if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1606 method->set_not_compilable_quietly(task->comp_level());
1607 }
1608
1609 // Note that the queued_for_compilation bits are cleared without
1610 // protection of a mutex. [They were set by the requester thread,
1611 // when adding the task to the complie queue -- at which time the
1612 // compile queue lock was held. Subsequently, we acquired the compile
1613 // queue lock to get this task off the compile queue; thus (to belabour
1614 // the point somewhat) our clearing of the bits must be occurring
1615 // only after the setting of the bits. See also 14012000 above.
1616 method->clear_queued_for_compilation();
1617
1618 #ifdef ASSERT
1619 if (CollectedHeap::fired_fake_oom()) {
1620 // The current compile received a fake OOM during compilation so
1621 // go ahead and exit the VM since the test apparently succeeded
1622 tty->print_cr("*** Shutting down VM after successful fake OOM");
1623 vm_exit(0);
1624 }
1625 #endif
1626 }
1627
1628 // ------------------------------------------------------------------
1629 // CompileBroker::handle_full_code_cache
1630 //
1631 // The CodeCache is full. Print out warning and disable compilation or
1632 // try code cache cleaning so compilation can continue later.
1633 void CompileBroker::handle_full_code_cache() {
1634 UseInterpreter = true;
1635 if (UseCompiler || AlwaysCompileLoopMethods ) {
1636 if (xtty != NULL) {
1637 xtty->begin_elem("code_cache_full");
1638 xtty->stamp();
1639 xtty->end_elem();
1640 }
1641 warning("CodeCache is full. Compiler has been disabled.");
1642 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1643 #ifndef PRODUCT
1644 if (CompileTheWorld || ExitOnFullCodeCache) {
1645 before_exit(JavaThread::current());
1646 exit_globals(); // will delete tty
1647 vm_direct_exit(CompileTheWorld ? 0 : 1);
1648 }
1649 #endif
1650 if (UseCodeCacheFlushing) {
1651 NMethodSweeper::handle_full_code_cache(true);
1652 } else {
1653 UseCompiler = false;
1654 AlwaysCompileLoopMethods = false;
1655 }
1656 }
1657 }
1658
1659 // ------------------------------------------------------------------
1660 // CompileBroker::set_last_compile
1661 //
1662 // Record this compilation for debugging purposes.
1663 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1664 ResourceMark rm;
1665 char* method_name = method->name()->as_C_string();
1666 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1667 char current_method[CompilerCounters::cmname_buffer_length];
1668 size_t maxLen = CompilerCounters::cmname_buffer_length;
1669
1670 if (UsePerfData) {
1671 const char* class_name = method->method_holder()->klass_part()->name()->as_C_string();
1672
1673 size_t s1len = strlen(class_name);
1674 size_t s2len = strlen(method_name);
1675
1676 // check if we need to truncate the string
1677 if (s1len + s2len + 2 > maxLen) {
1678
1679 // the strategy is to lop off the leading characters of the
1680 // class name and the trailing characters of the method name.
1681
1682 if (s2len + 2 > maxLen) {
1683 // lop of the entire class name string, let snprintf handle
1684 // truncation of the method name.
1685 class_name += s1len; // null string
1686 }
1687 else {
1688 // lop off the extra characters from the front of the class name
1689 class_name += ((s1len + s2len + 2) - maxLen);
1690 }
1691 }
1692
1693 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1694 }
1695
1696 if (CICountOSR && is_osr) {
1697 _last_compile_type = osr_compile;
1698 } else {
1699 _last_compile_type = normal_compile;
1700 }
1701 _last_compile_level = comp_level;
1702
1703 if (UsePerfData) {
1704 CompilerCounters* counters = thread->counters();
1705 counters->set_current_method(current_method);
1706 counters->set_compile_type((jlong)_last_compile_type);
1707 }
1708 }
1709
1710
1711 // ------------------------------------------------------------------
1712 // CompileBroker::push_jni_handle_block
1713 //
1714 // Push on a new block of JNI handles.
1715 void CompileBroker::push_jni_handle_block() {
1716 JavaThread* thread = JavaThread::current();
1717
1718 // Allocate a new block for JNI handles.
1719 // Inlined code from jni_PushLocalFrame()
1720 JNIHandleBlock* java_handles = thread->active_handles();
1721 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
1722 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
1723 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
1724 thread->set_active_handles(compile_handles);
1725 }
1726
1727
1728 // ------------------------------------------------------------------
1729 // CompileBroker::pop_jni_handle_block
1730 //
1731 // Pop off the current block of JNI handles.
1732 void CompileBroker::pop_jni_handle_block() {
1733 JavaThread* thread = JavaThread::current();
1734
1735 // Release our JNI handle block
1736 JNIHandleBlock* compile_handles = thread->active_handles();
1737 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
1738 thread->set_active_handles(java_handles);
1739 compile_handles->set_pop_frame_link(NULL);
1740 JNIHandleBlock::release_block(compile_handles, thread); // may block
1741 }
1742
1743
1744 // ------------------------------------------------------------------
1745 // CompileBroker::check_break_at
1746 //
1747 // Should the compilation break at the current compilation.
1748 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
1749 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
1750 return true;
1751 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
1752 return true;
1753 } else {
1754 return (compile_id == CIBreakAt);
1755 }
1756 }
1757
1758 // ------------------------------------------------------------------
1759 // CompileBroker::collect_statistics
1760 //
1761 // Collect statistics about the compilation.
1762
1763 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
1764 bool success = task->is_success();
1765 methodHandle method (thread, (methodOop)JNIHandles::resolve(task->method_handle()));
1766 uint compile_id = task->compile_id();
1767 bool is_osr = (task->osr_bci() != standard_entry_bci);
1768 nmethod* code = task->code();
1769 CompilerCounters* counters = thread->counters();
1770
1771 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
1772 MutexLocker locker(CompileStatistics_lock);
1773
1774 // _perf variables are production performance counters which are
1775 // updated regardless of the setting of the CITime and CITimeEach flags
1776 //
1777 if (!success) {
1778 _total_bailout_count++;
1779 if (UsePerfData) {
1780 _perf_last_failed_method->set_value(counters->current_method());
1781 _perf_last_failed_type->set_value(counters->compile_type());
1782 _perf_total_bailout_count->inc();
1783 }
1784 } else if (code == NULL) {
1785 if (UsePerfData) {
1786 _perf_last_invalidated_method->set_value(counters->current_method());
1787 _perf_last_invalidated_type->set_value(counters->compile_type());
1788 _perf_total_invalidated_count->inc();
1789 }
1790 _total_invalidated_count++;
1791 } else {
1792 // Compilation succeeded
1793
1794 // update compilation ticks - used by the implementation of
1795 // java.lang.management.CompilationMBean
1796 _perf_total_compilation->inc(time.ticks());
1797
1798 if (CITime) {
1799 _t_total_compilation.add(time);
1800 if (is_osr) {
1801 _t_osr_compilation.add(time);
1802 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1803 } else {
1804 _t_standard_compilation.add(time);
1805 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1806 }
1807 }
1808
1809 if (UsePerfData) {
1810 // save the name of the last method compiled
1811 _perf_last_method->set_value(counters->current_method());
1812 _perf_last_compile_type->set_value(counters->compile_type());
1813 _perf_last_compile_size->set_value(method->code_size() +
1814 task->num_inlined_bytecodes());
1815 if (is_osr) {
1816 _perf_osr_compilation->inc(time.ticks());
1817 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1818 } else {
1819 _perf_standard_compilation->inc(time.ticks());
1820 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1821 }
1822 }
1823
1824 if (CITimeEach) {
1825 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
1826 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
1827 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
1828 }
1829
1830 // Collect counts of successful compilations
1831 _sum_nmethod_size += code->total_size();
1832 _sum_nmethod_code_size += code->insts_size();
1833 _total_compile_count++;
1834
1835 if (UsePerfData) {
1836 _perf_sum_nmethod_size->inc( code->total_size());
1837 _perf_sum_nmethod_code_size->inc(code->insts_size());
1838 _perf_total_compile_count->inc();
1839 }
1840
1841 if (is_osr) {
1842 if (UsePerfData) _perf_total_osr_compile_count->inc();
1843 _total_osr_compile_count++;
1844 } else {
1845 if (UsePerfData) _perf_total_standard_compile_count->inc();
1846 _total_standard_compile_count++;
1847 }
1848 }
1849 // set the current method for the thread to null
1850 if (UsePerfData) counters->set_current_method("");
1851 }
1852
1853
1854
1855 void CompileBroker::print_times() {
1856 tty->cr();
1857 tty->print_cr("Accumulated compiler times (for compiled methods only)");
1858 tty->print_cr("------------------------------------------------");
1859 //0000000000111111111122222222223333333333444444444455555555556666666666
1860 //0123456789012345678901234567890123456789012345678901234567890123456789
1861 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
1862 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
1863 CompileBroker::_t_standard_compilation.seconds(),
1864 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
1865 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);
1866
1867 if (compiler(CompLevel_simple) != NULL) {
1868 compiler(CompLevel_simple)->print_timers();
1869 }
1870 if (compiler(CompLevel_full_optimization) != NULL) {
1871 compiler(CompLevel_full_optimization)->print_timers();
1872 }
1873 tty->cr();
1874 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
1875 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
1876 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
1877 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
1878 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
1879 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
1880 tty->cr();
1881 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
1882 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
1883 }
1884
1885
1886 // Debugging output for failure
1887 void CompileBroker::print_last_compile() {
1888 if ( _last_compile_level != CompLevel_none &&
1889 compiler(_last_compile_level) != NULL &&
1890 _last_method_compiled != NULL &&
1891 _last_compile_type != no_compile) {
1892 if (_last_compile_type == osr_compile) {
1893 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
1894 _osr_compilation_id, _last_compile_level, _last_method_compiled);
1895 } else {
1896 tty->print_cr("Last parse: %d+++(%d) %s",
1897 _compilation_id, _last_compile_level, _last_method_compiled);
1898 }
1899 }
1900 }
1901
1902
1903 void CompileBroker::print_compiler_threads_on(outputStream* st) {
1904 #ifndef PRODUCT
1905 st->print_cr("Compiler thread printing unimplemented.");
1906 st->cr();
1907 #endif
1908 }