1 /*
2 * Copyright (c) 1999, 2013, 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/methodData.hpp"
35 #include "oops/method.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 "trace/tracing.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #ifdef COMPILER1
50 #include "c1/c1_Compiler.hpp"
51 #endif
52 #ifdef COMPILER2
53 #include "opto/c2compiler.hpp"
54 #endif
55 #ifdef SHARK
56 #include "shark/sharkCompiler.hpp"
57 #endif
58
59 #ifdef DTRACE_ENABLED
60
61 // Only bother with this argument setup if dtrace is available
62
63 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
64 { \
65 Symbol* klass_name = (method)->klass_name(); \
66 Symbol* name = (method)->name(); \
67 Symbol* signature = (method)->signature(); \
68 HOTSPOT_METHOD_COMPILE_BEGIN( \
69 (char *) comp_name, strlen(comp_name), \
70 (char *) klass_name->bytes(), klass_name->utf8_length(), \
71 (char *) name->bytes(), name->utf8_length(), \
72 (char *) signature->bytes(), signature->utf8_length()); \
73 }
74
75 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
76 { \
77 Symbol* klass_name = (method)->klass_name(); \
78 Symbol* name = (method)->name(); \
79 Symbol* signature = (method)->signature(); \
80 HOTSPOT_METHOD_COMPILE_END( \
81 (char *) comp_name, strlen(comp_name), \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length(), (success)); \
85 }
86
87 #else // ndef DTRACE_ENABLED
88
89 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
90 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
91
92 #endif // ndef DTRACE_ENABLED
93
94 bool CompileBroker::_initialized = false;
95 volatile bool CompileBroker::_should_block = false;
96 volatile jint CompileBroker::_print_compilation_warning = 0;
97 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
98
99 // The installed compiler(s)
100 AbstractCompiler* CompileBroker::_compilers[2];
101
102 // These counters are used to assign an unique ID to each compilation.
103 volatile jint CompileBroker::_compilation_id = 0;
104 volatile jint CompileBroker::_osr_compilation_id = 0;
105
106 // Debugging information
107 int CompileBroker::_last_compile_type = no_compile;
108 int CompileBroker::_last_compile_level = CompLevel_none;
109 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
110
111 // Performance counters
112 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
113 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
114 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
115
116 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
117 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
118 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
119 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
121
122 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
123 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
124 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
125 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
126
127 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
128 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
129 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
130 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
131 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
132 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
133 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
134
135 // Timers and counters for generating statistics
136 elapsedTimer CompileBroker::_t_total_compilation;
137 elapsedTimer CompileBroker::_t_osr_compilation;
138 elapsedTimer CompileBroker::_t_standard_compilation;
139
140 int CompileBroker::_total_bailout_count = 0;
141 int CompileBroker::_total_invalidated_count = 0;
142 int CompileBroker::_total_compile_count = 0;
143 int CompileBroker::_total_osr_compile_count = 0;
144 int CompileBroker::_total_standard_compile_count = 0;
145
146 int CompileBroker::_sum_osr_bytes_compiled = 0;
147 int CompileBroker::_sum_standard_bytes_compiled = 0;
148 int CompileBroker::_sum_nmethod_size = 0;
149 int CompileBroker::_sum_nmethod_code_size = 0;
150
151 long CompileBroker::_peak_compilation_time = 0;
152
153 CompileQueue* CompileBroker::_c2_method_queue = NULL;
154 CompileQueue* CompileBroker::_c1_method_queue = NULL;
155 CompileTask* CompileBroker::_task_free_list = NULL;
156
157 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
158
159
160 class CompilationLog : public StringEventLog {
161 public:
162 CompilationLog() : StringEventLog("Compilation events") {
163 }
164
165 void log_compile(JavaThread* thread, CompileTask* task) {
166 StringLogMessage lm;
167 stringStream sstr = lm.stream();
168 // msg.time_stamp().update_to(tty->time_stamp().ticks());
169 task->print_compilation(&sstr, NULL, true);
170 log(thread, "%s", (const char*)lm);
171 }
172
173 void log_nmethod(JavaThread* thread, nmethod* nm) {
174 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
175 nm->compile_id(), nm->is_osr_method() ? "%" : "",
176 nm, nm->code_begin(), nm->code_end());
177 }
178
179 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
180 StringLogMessage lm;
181 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
182 if (retry_message != NULL) {
183 lm.append(" (%s)", retry_message);
184 }
185 lm.print("\n");
186 log(thread, "%s", (const char*)lm);
187 }
188 };
189
190 static CompilationLog* _compilation_log = NULL;
191
192 void compileBroker_init() {
193 if (LogEvents) {
194 _compilation_log = new CompilationLog();
195 }
196 }
197
198 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
199 CompilerThread* thread = CompilerThread::current();
200 thread->set_task(task);
201 CompileLog* log = thread->log();
202 if (log != NULL) task->log_task_start(log);
203 }
204
205 CompileTaskWrapper::~CompileTaskWrapper() {
206 CompilerThread* thread = CompilerThread::current();
207 CompileTask* task = thread->task();
208 CompileLog* log = thread->log();
209 if (log != NULL) task->log_task_done(log);
210 thread->set_task(NULL);
211 task->set_code_handle(NULL);
212 thread->set_env(NULL);
213 if (task->is_blocking()) {
214 MutexLocker notifier(task->lock(), thread);
215 task->mark_complete();
216 // Notify the waiting thread that the compilation has completed.
217 task->lock()->notify_all();
218 } else {
219 task->mark_complete();
220
221 // By convention, the compiling thread is responsible for
222 // recycling a non-blocking CompileTask.
223 CompileBroker::free_task(task);
224 }
225 }
226
227
228 // ------------------------------------------------------------------
229 // CompileTask::initialize
230 void CompileTask::initialize(int compile_id,
231 methodHandle method,
232 int osr_bci,
233 int comp_level,
234 methodHandle hot_method,
235 int hot_count,
236 const char* comment,
237 bool is_blocking) {
238 assert(!_lock->is_locked(), "bad locking");
239
240 _compile_id = compile_id;
241 _method = method();
242 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
243 _osr_bci = osr_bci;
244 _is_blocking = is_blocking;
245 _comp_level = comp_level;
246 _num_inlined_bytecodes = 0;
247
248 _is_complete = false;
249 _is_success = false;
250 _code_handle = NULL;
251
252 _hot_method = NULL;
253 _hot_method_holder = NULL;
254 _hot_count = hot_count;
255 _time_queued = 0; // tidy
256 _comment = comment;
257
258 if (LogCompilation) {
259 _time_queued = os::elapsed_counter();
260 if (hot_method.not_null()) {
261 if (hot_method == method) {
262 _hot_method = _method;
263 } else {
264 _hot_method = hot_method();
265 // only add loader or mirror if different from _method_holder
266 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
267 }
268 }
269 }
270
271 _next = NULL;
272 }
273
274 // ------------------------------------------------------------------
275 // CompileTask::code/set_code
276 nmethod* CompileTask::code() const {
277 if (_code_handle == NULL) return NULL;
278 return _code_handle->code();
279 }
280 void CompileTask::set_code(nmethod* nm) {
281 if (_code_handle == NULL && nm == NULL) return;
282 guarantee(_code_handle != NULL, "");
283 _code_handle->set_code(nm);
284 if (nm == NULL) _code_handle = NULL; // drop the handle also
285 }
286
287 // ------------------------------------------------------------------
288 // CompileTask::free
289 void CompileTask::free() {
290 set_code(NULL);
291 assert(!_lock->is_locked(), "Should not be locked when freed");
292 JNIHandles::destroy_global(_method_holder);
293 JNIHandles::destroy_global(_hot_method_holder);
294 }
295
296
297 void CompileTask::mark_on_stack() {
298 // Mark these methods as something redefine classes cannot remove.
299 _method->set_on_stack(true);
300 if (_hot_method != NULL) {
301 _hot_method->set_on_stack(true);
302 }
303 }
304
305 // ------------------------------------------------------------------
306 // CompileTask::print
307 void CompileTask::print() {
308 tty->print("<CompileTask compile_id=%d ", _compile_id);
309 tty->print("method=");
310 _method->print_name(tty);
311 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
312 _osr_bci, bool_to_str(_is_blocking),
313 bool_to_str(_is_complete), bool_to_str(_is_success));
314 }
315
316
317 // ------------------------------------------------------------------
318 // CompileTask::print_line_on_error
319 //
320 // This function is called by fatal error handler when the thread
321 // causing troubles is a compiler thread.
322 //
323 // Do not grab any lock, do not allocate memory.
324 //
325 // Otherwise it's the same as CompileTask::print_line()
326 //
327 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
328 // print compiler name
329 st->print("%s:", CompileBroker::compiler_name(comp_level()));
330 print_compilation(st);
331 }
332
333 // ------------------------------------------------------------------
334 // CompileTask::print_line
335 void CompileTask::print_line() {
336 ttyLocker ttyl; // keep the following output all in one block
337 // print compiler name if requested
338 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
339 print_compilation();
340 }
341
342
343 // ------------------------------------------------------------------
344 // CompileTask::print_compilation_impl
345 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
346 bool is_osr_method, int osr_bci, bool is_blocking,
347 const char* msg, bool short_form) {
348 if (!short_form) {
349 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
350 }
351 st->print("%4d ", compile_id); // print compilation number
352
353 // For unloaded methods the transition to zombie occurs after the
354 // method is cleared so it's impossible to report accurate
355 // information for that case.
356 bool is_synchronized = false;
357 bool has_exception_handler = false;
358 bool is_native = false;
359 if (method != NULL) {
360 is_synchronized = method->is_synchronized();
361 has_exception_handler = method->has_exception_handler();
362 is_native = method->is_native();
363 }
364 // method attributes
365 const char compile_type = is_osr_method ? '%' : ' ';
366 const char sync_char = is_synchronized ? 's' : ' ';
367 const char exception_char = has_exception_handler ? '!' : ' ';
368 const char blocking_char = is_blocking ? 'b' : ' ';
369 const char native_char = is_native ? 'n' : ' ';
370
371 // print method attributes
372 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
373
374 if (TieredCompilation) {
375 if (comp_level != -1) st->print("%d ", comp_level);
376 else st->print("- ");
377 }
378 st->print(" "); // more indent
379
380 if (method == NULL) {
381 st->print("(method)");
382 } else {
383 method->print_short_name(st);
384 if (is_osr_method) {
385 st->print(" @ %d", osr_bci);
386 }
387 if (method->is_native())
388 st->print(" (native)");
389 else
390 st->print(" (%d bytes)", method->code_size());
391 }
392
393 if (msg != NULL) {
394 st->print(" %s", msg);
395 }
396 if (!short_form) {
397 st->cr();
398 }
399 }
400
401 // ------------------------------------------------------------------
402 // CompileTask::print_inlining
403 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
404 // 1234567
405 st->print(" "); // print timestamp
406 // 1234
407 st->print(" "); // print compilation number
408
409 // method attributes
410 if (method->is_loaded()) {
411 const char sync_char = method->is_synchronized() ? 's' : ' ';
412 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
413 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
414
415 // print method attributes
416 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
417 } else {
418 // %s!bn
419 st->print(" "); // print method attributes
420 }
421
422 if (TieredCompilation) {
423 st->print(" ");
424 }
425 st->print(" "); // more indent
426 st->print(" "); // initial inlining indent
427
428 for (int i = 0; i < inline_level; i++) st->print(" ");
429
430 st->print("@ %d ", bci); // print bci
431 method->print_short_name(st);
432 if (method->is_loaded())
433 st->print(" (%d bytes)", method->code_size());
434 else
435 st->print(" (not loaded)");
436
437 if (msg != NULL) {
438 st->print(" %s", msg);
439 }
440 st->cr();
441 }
442
443 // ------------------------------------------------------------------
444 // CompileTask::print_inline_indent
445 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
446 // 1234567
447 st->print(" "); // print timestamp
448 // 1234
449 st->print(" "); // print compilation number
450 // %s!bn
451 st->print(" "); // print method attributes
452 if (TieredCompilation) {
453 st->print(" ");
454 }
455 st->print(" "); // more indent
456 st->print(" "); // initial inlining indent
457 for (int i = 0; i < inline_level; i++) st->print(" ");
458 }
459
460 // ------------------------------------------------------------------
461 // CompileTask::print_compilation
462 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
463 bool is_osr_method = osr_bci() != InvocationEntryBci;
464 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
465 }
466
467 // ------------------------------------------------------------------
468 // CompileTask::log_task
469 void CompileTask::log_task(xmlStream* log) {
470 Thread* thread = Thread::current();
471 methodHandle method(thread, this->method());
472 ResourceMark rm(thread);
473
474 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
475 log->print(" compile_id='%d'", _compile_id);
476 if (_osr_bci != CompileBroker::standard_entry_bci) {
477 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
478 } // else compile_kind='c2c'
479 if (!method.is_null()) log->method(method);
480 if (_osr_bci != CompileBroker::standard_entry_bci) {
481 log->print(" osr_bci='%d'", _osr_bci);
482 }
483 if (_comp_level != CompLevel_highest_tier) {
484 log->print(" level='%d'", _comp_level);
485 }
486 if (_is_blocking) {
487 log->print(" blocking='1'");
488 }
489 log->stamp();
490 }
491
492
493 // ------------------------------------------------------------------
494 // CompileTask::log_task_queued
495 void CompileTask::log_task_queued() {
496 Thread* thread = Thread::current();
497 ttyLocker ttyl;
498 ResourceMark rm(thread);
499
500 xtty->begin_elem("task_queued");
501 log_task(xtty);
502 if (_comment != NULL) {
503 xtty->print(" comment='%s'", _comment);
504 }
505 if (_hot_method != NULL) {
506 methodHandle hot(thread, _hot_method);
507 methodHandle method(thread, _method);
508 if (hot() != method()) {
509 xtty->method(hot);
510 }
511 }
512 if (_hot_count != 0) {
513 xtty->print(" hot_count='%d'", _hot_count);
514 }
515 xtty->end_elem();
516 }
517
518
519 // ------------------------------------------------------------------
520 // CompileTask::log_task_start
521 void CompileTask::log_task_start(CompileLog* log) {
522 log->begin_head("task");
523 log_task(log);
524 log->end_head();
525 }
526
527
528 // ------------------------------------------------------------------
529 // CompileTask::log_task_done
530 void CompileTask::log_task_done(CompileLog* log) {
531 Thread* thread = Thread::current();
532 methodHandle method(thread, this->method());
533 ResourceMark rm(thread);
534
535 // <task_done ... stamp='1.234'> </task>
536 nmethod* nm = code();
537 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
538 _is_success, nm == NULL ? 0 : nm->content_size(),
539 method->invocation_count());
540 int bec = method->backedge_count();
541 if (bec != 0) log->print(" backedge_count='%d'", bec);
542 // Note: "_is_complete" is about to be set, but is not.
543 if (_num_inlined_bytecodes != 0) {
544 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
545 }
546 log->stamp();
547 log->end_elem();
548 log->tail("task");
549 log->clear_identities(); // next task will have different CI
550 if (log->unflushed_count() > 2000) {
551 log->flush();
552 }
553 log->mark_file_end();
554 }
555
556
557
558 // Add a CompileTask to a CompileQueue
559 void CompileQueue::add(CompileTask* task) {
560 assert(lock()->owned_by_self(), "must own lock");
561
562 task->set_next(NULL);
563 task->set_prev(NULL);
564
565 if (_last == NULL) {
566 // The compile queue is empty.
567 assert(_first == NULL, "queue is empty");
568 _first = task;
569 _last = task;
570 } else {
571 // Append the task to the queue.
572 assert(_last->next() == NULL, "not last");
573 _last->set_next(task);
574 task->set_prev(_last);
575 _last = task;
576 }
577 ++_size;
578
579 // Mark the method as being in the compile queue.
580 task->method()->set_queued_for_compilation();
581
582 if (CIPrintCompileQueue) {
583 print();
584 }
585
586 if (LogCompilation && xtty != NULL) {
587 task->log_task_queued();
588 }
589
590 // Notify CompilerThreads that a task is available.
591 lock()->notify_all();
592 }
593
594 void CompileQueue::delete_all() {
595 assert(lock()->owned_by_self(), "must own lock");
596 if (_first != NULL) {
597 CompileTask* task = _first;
598 do {
599 CompileTask* delete_task = task;
600 task = task->next();
601 delete delete_task;
602 } while (task != NULL);
603 _first = NULL;
604 }
605 }
606
607 // ------------------------------------------------------------------
608 // CompileQueue::get
609 //
610 // Get the next CompileTask from a CompileQueue
611 CompileTask* CompileQueue::get() {
612 NMethodSweeper::possibly_sweep();
613
614 MutexLocker locker(lock());
615 // If _first is NULL we have no more compile jobs. There are two reasons for
616 // having no compile jobs: First, we compiled everything we wanted. Second,
617 // we ran out of code cache so compilation has been disabled. In the latter
618 // case we perform code cache sweeps to free memory such that we can re-enable
619 // compilation.
620 while (_first == NULL) {
621 // Exit loop if compilation is disabled forever
622 if (CompileBroker::is_compilation_disabled_forever()) {
623 return NULL;
624 }
625
626 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
627 // Wait a certain amount of time to possibly do another sweep.
628 // We must wait until stack scanning has happened so that we can
629 // transition a method's state from 'not_entrant' to 'zombie'.
630 long wait_time = NmethodSweepCheckInterval * 1000;
631 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
632 // Only one thread at a time can do sweeping. Scale the
633 // wait time according to the number of compiler threads.
634 // As a result, the next sweep is likely to happen every 100ms
635 // with an arbitrary number of threads that do sweeping.
636 wait_time = 100 * CICompilerCount;
637 }
638 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
639 if (timeout) {
640 MutexUnlocker ul(lock());
641 NMethodSweeper::possibly_sweep();
642 }
643 } else {
644 // If there are no compilation tasks and we can compile new jobs
645 // (i.e., there is enough free space in the code cache) there is
646 // no need to invoke the sweeper. As a result, the hotness of methods
647 // remains unchanged. This behavior is desired, since we want to keep
648 // the stable state, i.e., we do not want to evict methods from the
649 // code cache if it is unnecessary.
650 // We need a timed wait here, since compiler threads can exit if compilation
651 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
652 // is not critical and we do not want idle compiler threads to wake up too often.
653 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
654 }
655 }
656
657 if (CompileBroker::is_compilation_disabled_forever()) {
658 return NULL;
659 }
660
661 CompileTask* task = CompilationPolicy::policy()->select_task(this);
662 remove(task);
663 return task;
664 }
665
666 void CompileQueue::remove(CompileTask* task)
667 {
668 assert(lock()->owned_by_self(), "must own lock");
669 if (task->prev() != NULL) {
670 task->prev()->set_next(task->next());
671 } else {
672 // max is the first element
673 assert(task == _first, "Sanity");
674 _first = task->next();
675 }
676
677 if (task->next() != NULL) {
678 task->next()->set_prev(task->prev());
679 } else {
680 // max is the last element
681 assert(task == _last, "Sanity");
682 _last = task->prev();
683 }
684 --_size;
685 }
686
687 // methods in the compile queue need to be marked as used on the stack
688 // so that they don't get reclaimed by Redefine Classes
689 void CompileQueue::mark_on_stack() {
690 CompileTask* task = _first;
691 while (task != NULL) {
692 task->mark_on_stack();
693 task = task->next();
694 }
695 }
696
697 // ------------------------------------------------------------------
698 // CompileQueue::print
699 void CompileQueue::print() {
700 tty->print_cr("Contents of %s", name());
701 tty->print_cr("----------------------");
702 CompileTask* task = _first;
703 while (task != NULL) {
704 task->print_line();
705 task = task->next();
706 }
707 tty->print_cr("----------------------");
708 }
709
710 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
711
712 _current_method[0] = '\0';
713 _compile_type = CompileBroker::no_compile;
714
715 if (UsePerfData) {
716 ResourceMark rm;
717
718 // create the thread instance name space string - don't create an
719 // instance subspace if instance is -1 - keeps the adapterThread
720 // counters from having a ".0" namespace.
721 const char* thread_i = (instance == -1) ? thread_name :
722 PerfDataManager::name_space(thread_name, instance);
723
724
725 char* name = PerfDataManager::counter_name(thread_i, "method");
726 _perf_current_method =
727 PerfDataManager::create_string_variable(SUN_CI, name,
728 cmname_buffer_length,
729 _current_method, CHECK);
730
731 name = PerfDataManager::counter_name(thread_i, "type");
732 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
733 PerfData::U_None,
734 (jlong)_compile_type,
735 CHECK);
736
737 name = PerfDataManager::counter_name(thread_i, "time");
738 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
739 PerfData::U_Ticks, CHECK);
740
741 name = PerfDataManager::counter_name(thread_i, "compiles");
742 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
743 PerfData::U_Events, CHECK);
744 }
745 }
746
747 // ------------------------------------------------------------------
748 // CompileBroker::compilation_init
749 //
750 // Initialize the Compilation object
751 void CompileBroker::compilation_init() {
752 _last_method_compiled[0] = '\0';
753
754 // No need to initialize compilation system if we do not use it.
755 if (!UseCompiler) {
756 return;
757 }
758 #ifndef SHARK
759 // Set the interface to the current compiler(s).
760 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
761 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
762 #ifdef COMPILER1
763 if (c1_count > 0) {
764 _compilers[0] = new Compiler();
765 }
766 #endif // COMPILER1
767
768 #ifdef COMPILER2
769 if (c2_count > 0) {
770 _compilers[1] = new C2Compiler();
771 }
772 #endif // COMPILER2
773
774 #else // SHARK
775 int c1_count = 0;
776 int c2_count = 1;
777
778 _compilers[1] = new SharkCompiler();
779 #endif // SHARK
780
781 // Initialize the CompileTask free list
782 _task_free_list = NULL;
783
784 // Start the CompilerThreads
785 init_compiler_threads(c1_count, c2_count);
786 // totalTime performance counter is always created as it is required
787 // by the implementation of java.lang.management.CompilationMBean.
788 {
789 EXCEPTION_MARK;
790 _perf_total_compilation =
791 PerfDataManager::create_counter(JAVA_CI, "totalTime",
792 PerfData::U_Ticks, CHECK);
793 }
794
795
796 if (UsePerfData) {
797
798 EXCEPTION_MARK;
799
800 // create the jvmstat performance counters
801 _perf_osr_compilation =
802 PerfDataManager::create_counter(SUN_CI, "osrTime",
803 PerfData::U_Ticks, CHECK);
804
805 _perf_standard_compilation =
806 PerfDataManager::create_counter(SUN_CI, "standardTime",
807 PerfData::U_Ticks, CHECK);
808
809 _perf_total_bailout_count =
810 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
811 PerfData::U_Events, CHECK);
812
813 _perf_total_invalidated_count =
814 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
815 PerfData::U_Events, CHECK);
816
817 _perf_total_compile_count =
818 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
819 PerfData::U_Events, CHECK);
820 _perf_total_osr_compile_count =
821 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
822 PerfData::U_Events, CHECK);
823
824 _perf_total_standard_compile_count =
825 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
826 PerfData::U_Events, CHECK);
827
828 _perf_sum_osr_bytes_compiled =
829 PerfDataManager::create_counter(SUN_CI, "osrBytes",
830 PerfData::U_Bytes, CHECK);
831
832 _perf_sum_standard_bytes_compiled =
833 PerfDataManager::create_counter(SUN_CI, "standardBytes",
834 PerfData::U_Bytes, CHECK);
835
836 _perf_sum_nmethod_size =
837 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
838 PerfData::U_Bytes, CHECK);
839
840 _perf_sum_nmethod_code_size =
841 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
842 PerfData::U_Bytes, CHECK);
843
844 _perf_last_method =
845 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
846 CompilerCounters::cmname_buffer_length,
847 "", CHECK);
848
849 _perf_last_failed_method =
850 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
851 CompilerCounters::cmname_buffer_length,
852 "", CHECK);
853
854 _perf_last_invalidated_method =
855 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
856 CompilerCounters::cmname_buffer_length,
857 "", CHECK);
858
859 _perf_last_compile_type =
860 PerfDataManager::create_variable(SUN_CI, "lastType",
861 PerfData::U_None,
862 (jlong)CompileBroker::no_compile,
863 CHECK);
864
865 _perf_last_compile_size =
866 PerfDataManager::create_variable(SUN_CI, "lastSize",
867 PerfData::U_Bytes,
868 (jlong)CompileBroker::no_compile,
869 CHECK);
870
871
872 _perf_last_failed_type =
873 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
874 PerfData::U_None,
875 (jlong)CompileBroker::no_compile,
876 CHECK);
877
878 _perf_last_invalidated_type =
879 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
880 PerfData::U_None,
881 (jlong)CompileBroker::no_compile,
882 CHECK);
883 }
884
885 _initialized = true;
886 }
887
888
889 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
890 AbstractCompiler* comp, TRAPS) {
891 CompilerThread* compiler_thread = NULL;
892
893 Klass* k =
894 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
895 true, CHECK_0);
896 instanceKlassHandle klass (THREAD, k);
897 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
898 Handle string = java_lang_String::create_from_str(name, CHECK_0);
899
900 // Initialize thread_oop to put it into the system threadGroup
901 Handle thread_group (THREAD, Universe::system_thread_group());
902 JavaValue result(T_VOID);
903 JavaCalls::call_special(&result, thread_oop,
904 klass,
905 vmSymbols::object_initializer_name(),
906 vmSymbols::threadgroup_string_void_signature(),
907 thread_group,
908 string,
909 CHECK_0);
910
911 {
912 MutexLocker mu(Threads_lock, THREAD);
913 compiler_thread = new CompilerThread(queue, counters);
914 // At this point the new CompilerThread data-races with this startup
915 // thread (which I believe is the primoridal thread and NOT the VM
916 // thread). This means Java bytecodes being executed at startup can
917 // queue compile jobs which will run at whatever default priority the
918 // newly created CompilerThread runs at.
919
920
921 // At this point it may be possible that no osthread was created for the
922 // JavaThread due to lack of memory. We would have to throw an exception
923 // in that case. However, since this must work and we do not allow
924 // exceptions anyway, check and abort if this fails.
925
926 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
927 vm_exit_during_initialization("java.lang.OutOfMemoryError",
928 os::native_thread_creation_failed_msg());
929 }
930
931 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
932
933 // Note that this only sets the JavaThread _priority field, which by
934 // definition is limited to Java priorities and not OS priorities.
935 // The os-priority is set in the CompilerThread startup code itself
936
937 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
938
939 // Note that we cannot call os::set_priority because it expects Java
940 // priorities and we are *explicitly* using OS priorities so that it's
941 // possible to set the compiler thread priority higher than any Java
942 // thread.
943
944 int native_prio = CompilerThreadPriority;
945 if (native_prio == -1) {
946 if (UseCriticalCompilerThreadPriority) {
947 native_prio = os::java_to_os_priority[CriticalPriority];
948 } else {
949 native_prio = os::java_to_os_priority[NearMaxPriority];
950 }
951 }
952 os::set_native_priority(compiler_thread, native_prio);
953
954 java_lang_Thread::set_daemon(thread_oop());
955
956 compiler_thread->set_threadObj(thread_oop());
957 compiler_thread->set_compiler(comp);
958 Threads::add(compiler_thread);
959 Thread::start(compiler_thread);
960 }
961
962 // Let go of Threads_lock before yielding
963 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
964
965 return compiler_thread;
966 }
967
968
969 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
970 EXCEPTION_MARK;
971 #if !defined(ZERO) && !defined(SHARK)
972 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
973 #endif // !ZERO && !SHARK
974 // Initialize the compilation queue
975 if (c2_compiler_count > 0) {
976 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
977 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
978 }
979 if (c1_compiler_count > 0) {
980 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
981 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
982 }
983
984 int compiler_count = c1_compiler_count + c2_compiler_count;
985
986 _compiler_threads =
987 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
988
989 char name_buffer[256];
990 for (int i = 0; i < c2_compiler_count; i++) {
991 // Create a name for our thread.
992 sprintf(name_buffer, "C2 CompilerThread%d", i);
993 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
994 // Shark and C2
995 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK);
996 _compiler_threads->append(new_thread);
997 }
998
999 for (int i = c2_compiler_count; i < compiler_count; i++) {
1000 // Create a name for our thread.
1001 sprintf(name_buffer, "C1 CompilerThread%d", i);
1002 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1003 // C1
1004 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK);
1005 _compiler_threads->append(new_thread);
1006 }
1007
1008 if (UsePerfData) {
1009 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1010 }
1011 }
1012
1013
1014 // Set the methods on the stack as on_stack so that redefine classes doesn't
1015 // reclaim them
1016 void CompileBroker::mark_on_stack() {
1017 if (_c2_method_queue != NULL) {
1018 _c2_method_queue->mark_on_stack();
1019 }
1020 if (_c1_method_queue != NULL) {
1021 _c1_method_queue->mark_on_stack();
1022 }
1023 }
1024
1025 // ------------------------------------------------------------------
1026 // CompileBroker::compile_method
1027 //
1028 // Request compilation of a method.
1029 void CompileBroker::compile_method_base(methodHandle method,
1030 int osr_bci,
1031 int comp_level,
1032 methodHandle hot_method,
1033 int hot_count,
1034 const char* comment,
1035 Thread* thread) {
1036 // do nothing if compiler thread(s) is not available
1037 if (!_initialized ) {
1038 return;
1039 }
1040
1041 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1042 assert(method->method_holder()->oop_is_instance(),
1043 "sanity check");
1044 assert(!method->method_holder()->is_not_initialized(),
1045 "method holder must be initialized");
1046 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1047
1048 if (CIPrintRequests) {
1049 tty->print("request: ");
1050 method->print_short_name(tty);
1051 if (osr_bci != InvocationEntryBci) {
1052 tty->print(" osr_bci: %d", osr_bci);
1053 }
1054 tty->print(" comment: %s count: %d", comment, hot_count);
1055 if (!hot_method.is_null()) {
1056 tty->print(" hot: ");
1057 if (hot_method() != method()) {
1058 hot_method->print_short_name(tty);
1059 } else {
1060 tty->print("yes");
1061 }
1062 }
1063 tty->cr();
1064 }
1065
1066 // A request has been made for compilation. Before we do any
1067 // real work, check to see if the method has been compiled
1068 // in the meantime with a definitive result.
1069 if (compilation_is_complete(method, osr_bci, comp_level)) {
1070 return;
1071 }
1072
1073 #ifndef PRODUCT
1074 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1075 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1076 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1077 return;
1078 }
1079 }
1080 #endif
1081
1082 // If this method is already in the compile queue, then
1083 // we do not block the current thread.
1084 if (compilation_is_in_queue(method, osr_bci)) {
1085 // We may want to decay our counter a bit here to prevent
1086 // multiple denied requests for compilation. This is an
1087 // open compilation policy issue. Note: The other possibility,
1088 // in the case that this is a blocking compile request, is to have
1089 // all subsequent blocking requesters wait for completion of
1090 // ongoing compiles. Note that in this case we'll need a protocol
1091 // for freeing the associated compile tasks. [Or we could have
1092 // a single static monitor on which all these waiters sleep.]
1093 return;
1094 }
1095
1096 // If the requesting thread is holding the pending list lock
1097 // then we just return. We can't risk blocking while holding
1098 // the pending list lock or a 3-way deadlock may occur
1099 // between the reference handler thread, a GC (instigated
1100 // by a compiler thread), and compiled method registration.
1101 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1102 return;
1103 }
1104
1105 // Outputs from the following MutexLocker block:
1106 CompileTask* task = NULL;
1107 bool blocking = false;
1108 CompileQueue* queue = compile_queue(comp_level);
1109
1110 // Acquire our lock.
1111 {
1112 MutexLocker locker(queue->lock(), thread);
1113
1114 // Make sure the method has not slipped into the queues since
1115 // last we checked; note that those checks were "fast bail-outs".
1116 // Here we need to be more careful, see 14012000 below.
1117 if (compilation_is_in_queue(method, osr_bci)) {
1118 return;
1119 }
1120
1121 // We need to check again to see if the compilation has
1122 // completed. A previous compilation may have registered
1123 // some result.
1124 if (compilation_is_complete(method, osr_bci, comp_level)) {
1125 return;
1126 }
1127
1128 // We now know that this compilation is not pending, complete,
1129 // or prohibited. Assign a compile_id to this compilation
1130 // and check to see if it is in our [Start..Stop) range.
1131 int compile_id = assign_compile_id(method, osr_bci);
1132 if (compile_id == 0) {
1133 // The compilation falls outside the allowed range.
1134 return;
1135 }
1136
1137 // Should this thread wait for completion of the compile?
1138 blocking = is_compile_blocking(method, osr_bci);
1139
1140 // We will enter the compilation in the queue.
1141 // 14012000: Note that this sets the queued_for_compile bits in
1142 // the target method. We can now reason that a method cannot be
1143 // queued for compilation more than once, as follows:
1144 // Before a thread queues a task for compilation, it first acquires
1145 // the compile queue lock, then checks if the method's queued bits
1146 // are set or it has already been compiled. Thus there can not be two
1147 // instances of a compilation task for the same method on the
1148 // compilation queue. Consider now the case where the compilation
1149 // thread has already removed a task for that method from the queue
1150 // and is in the midst of compiling it. In this case, the
1151 // queued_for_compile bits must be set in the method (and these
1152 // will be visible to the current thread, since the bits were set
1153 // under protection of the compile queue lock, which we hold now.
1154 // When the compilation completes, the compiler thread first sets
1155 // the compilation result and then clears the queued_for_compile
1156 // bits. Neither of these actions are protected by a barrier (or done
1157 // under the protection of a lock), so the only guarantee we have
1158 // (on machines with TSO (Total Store Order)) is that these values
1159 // will update in that order. As a result, the only combinations of
1160 // these bits that the current thread will see are, in temporal order:
1161 // <RESULT, QUEUE> :
1162 // <0, 1> : in compile queue, but not yet compiled
1163 // <1, 1> : compiled but queue bit not cleared
1164 // <1, 0> : compiled and queue bit cleared
1165 // Because we first check the queue bits then check the result bits,
1166 // we are assured that we cannot introduce a duplicate task.
1167 // Note that if we did the tests in the reverse order (i.e. check
1168 // result then check queued bit), we could get the result bit before
1169 // the compilation completed, and the queue bit after the compilation
1170 // completed, and end up introducing a "duplicate" (redundant) task.
1171 // In that case, the compiler thread should first check if a method
1172 // has already been compiled before trying to compile it.
1173 // NOTE: in the event that there are multiple compiler threads and
1174 // there is de-optimization/recompilation, things will get hairy,
1175 // and in that case it's best to protect both the testing (here) of
1176 // these bits, and their updating (here and elsewhere) under a
1177 // common lock.
1178 task = create_compile_task(queue,
1179 compile_id, method,
1180 osr_bci, comp_level,
1181 hot_method, hot_count, comment,
1182 blocking);
1183 }
1184
1185 if (blocking) {
1186 wait_for_completion(task);
1187 }
1188 }
1189
1190
1191 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1192 int comp_level,
1193 methodHandle hot_method, int hot_count,
1194 const char* comment, Thread* THREAD) {
1195 // make sure arguments make sense
1196 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1197 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1198 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1199 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1200 // allow any levels for WhiteBox
1201 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1202 // return quickly if possible
1203
1204 // lock, make sure that the compilation
1205 // isn't prohibited in a straightforward way.
1206 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1207 if (comp == NULL || !comp->can_compile_method(method) ||
1208 compilation_is_prohibited(method, osr_bci, comp_level)) {
1209 return NULL;
1210 }
1211
1212 if (osr_bci == InvocationEntryBci) {
1213 // standard compilation
1214 nmethod* method_code = method->code();
1215 if (method_code != NULL) {
1216 if (compilation_is_complete(method, osr_bci, comp_level)) {
1217 return method_code;
1218 }
1219 }
1220 if (method->is_not_compilable(comp_level)) {
1221 return NULL;
1222 }
1223 } else {
1224 // osr compilation
1225 #ifndef TIERED
1226 // seems like an assert of dubious value
1227 assert(comp_level == CompLevel_highest_tier,
1228 "all OSR compiles are assumed to be at a single compilation lavel");
1229 #endif // TIERED
1230 // We accept a higher level osr method
1231 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1232 if (nm != NULL) return nm;
1233 if (method->is_not_osr_compilable(comp_level)) return NULL;
1234 }
1235
1236 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1237 // some prerequisites that are compiler specific
1238 if (comp->is_c2() || comp->is_shark()) {
1239 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1240 // Resolve all classes seen in the signature of the method
1241 // we are compiling.
1242 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1243 }
1244
1245 // If the method is native, do the lookup in the thread requesting
1246 // the compilation. Native lookups can load code, which is not
1247 // permitted during compilation.
1248 //
1249 // Note: A native method implies non-osr compilation which is
1250 // checked with an assertion at the entry of this method.
1251 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1252 bool in_base_library;
1253 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1254 if (HAS_PENDING_EXCEPTION) {
1255 // In case of an exception looking up the method, we just forget
1256 // about it. The interpreter will kick-in and throw the exception.
1257 method->set_not_compilable(); // implies is_not_osr_compilable()
1258 CLEAR_PENDING_EXCEPTION;
1259 return NULL;
1260 }
1261 assert(method->has_native_function(), "must have native code by now");
1262 }
1263
1264 // RedefineClasses() has replaced this method; just return
1265 if (method->is_old()) {
1266 return NULL;
1267 }
1268
1269 // JVMTI -- post_compile_event requires jmethod_id() that may require
1270 // a lock the compiling thread can not acquire. Prefetch it here.
1271 if (JvmtiExport::should_post_compiled_method_load()) {
1272 method->jmethod_id();
1273 }
1274
1275 // do the compilation
1276 if (method->is_native()) {
1277 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1278 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1279 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1280 //
1281 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1282 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1283 AdapterHandlerLibrary::create_native_wrapper(method);
1284 } else {
1285 return NULL;
1286 }
1287 } else {
1288 // If the compiler is shut off due to code cache getting full
1289 // fail out now so blocking compiles dont hang the java thread
1290 if (!should_compile_new_jobs()) {
1291 CompilationPolicy::policy()->delay_compilation(method());
1292 return NULL;
1293 }
1294 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1295 }
1296
1297 // return requested nmethod
1298 // We accept a higher level osr method
1299 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1300 }
1301
1302
1303 // ------------------------------------------------------------------
1304 // CompileBroker::compilation_is_complete
1305 //
1306 // See if compilation of this method is already complete.
1307 bool CompileBroker::compilation_is_complete(methodHandle method,
1308 int osr_bci,
1309 int comp_level) {
1310 bool is_osr = (osr_bci != standard_entry_bci);
1311 if (is_osr) {
1312 if (method->is_not_osr_compilable(comp_level)) {
1313 return true;
1314 } else {
1315 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1316 return (result != NULL);
1317 }
1318 } else {
1319 if (method->is_not_compilable(comp_level)) {
1320 return true;
1321 } else {
1322 nmethod* result = method->code();
1323 if (result == NULL) return false;
1324 return comp_level == result->comp_level();
1325 }
1326 }
1327 }
1328
1329
1330 // ------------------------------------------------------------------
1331 // CompileBroker::compilation_is_in_queue
1332 //
1333 // See if this compilation is already requested.
1334 //
1335 // Implementation note: there is only a single "is in queue" bit
1336 // for each method. This means that the check below is overly
1337 // conservative in the sense that an osr compilation in the queue
1338 // will block a normal compilation from entering the queue (and vice
1339 // versa). This can be remedied by a full queue search to disambiguate
1340 // cases. If it is deemed profitible, this may be done.
1341 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1342 int osr_bci) {
1343 return method->queued_for_compilation();
1344 }
1345
1346 // ------------------------------------------------------------------
1347 // CompileBroker::compilation_is_prohibited
1348 //
1349 // See if this compilation is not allowed.
1350 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1351 bool is_native = method->is_native();
1352 // Some compilers may not support the compilation of natives.
1353 AbstractCompiler *comp = compiler(comp_level);
1354 if (is_native &&
1355 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1356 method->set_not_compilable_quietly(comp_level);
1357 return true;
1358 }
1359
1360 bool is_osr = (osr_bci != standard_entry_bci);
1361 // Some compilers may not support on stack replacement.
1362 if (is_osr &&
1363 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1364 method->set_not_osr_compilable(comp_level);
1365 return true;
1366 }
1367
1368 // The method may be explicitly excluded by the user.
1369 bool quietly;
1370 if (CompilerOracle::should_exclude(method, quietly)) {
1371 if (!quietly) {
1372 // This does not happen quietly...
1373 ResourceMark rm;
1374 tty->print("### Excluding %s:%s",
1375 method->is_native() ? "generation of native wrapper" : "compile",
1376 (method->is_static() ? " static" : ""));
1377 method->print_short_name(tty);
1378 tty->cr();
1379 }
1380 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1381 }
1382
1383 return false;
1384 }
1385
1386 /**
1387 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1388 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1389 * The function also allows to generate separate compilation IDs for OSR compilations.
1390 */
1391 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1392 #ifdef ASSERT
1393 bool is_osr = (osr_bci != standard_entry_bci);
1394 int id;
1395 if (method->is_native()) {
1396 assert(!is_osr, "can't be osr");
1397 // Adapters, native wrappers and method handle intrinsics
1398 // should be generated always.
1399 return Atomic::add(1, &_compilation_id);
1400 } else if (CICountOSR && is_osr) {
1401 id = Atomic::add(1, &_osr_compilation_id);
1402 if (CIStartOSR <= id && id < CIStopOSR) {
1403 return id;
1404 }
1405 } else {
1406 id = Atomic::add(1, &_compilation_id);
1407 if (CIStart <= id && id < CIStop) {
1408 return id;
1409 }
1410 }
1411
1412 // Method was not in the appropriate compilation range.
1413 method->set_not_compilable_quietly();
1414 return 0;
1415 #else
1416 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1417 // only _compilation_id is incremented.
1418 return Atomic::add(1, &_compilation_id);
1419 #endif
1420 }
1421
1422
1423 // ------------------------------------------------------------------
1424 // CompileBroker::is_compile_blocking
1425 //
1426 // Should the current thread be blocked until this compilation request
1427 // has been fulfilled?
1428 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1429 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1430 return !BackgroundCompilation;
1431 }
1432
1433
1434 // ------------------------------------------------------------------
1435 // CompileBroker::preload_classes
1436 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1437 // Move this code over from c1_Compiler.cpp
1438 ShouldNotReachHere();
1439 }
1440
1441
1442 // ------------------------------------------------------------------
1443 // CompileBroker::create_compile_task
1444 //
1445 // Create a CompileTask object representing the current request for
1446 // compilation. Add this task to the queue.
1447 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1448 int compile_id,
1449 methodHandle method,
1450 int osr_bci,
1451 int comp_level,
1452 methodHandle hot_method,
1453 int hot_count,
1454 const char* comment,
1455 bool blocking) {
1456 CompileTask* new_task = allocate_task();
1457 new_task->initialize(compile_id, method, osr_bci, comp_level,
1458 hot_method, hot_count, comment,
1459 blocking);
1460 queue->add(new_task);
1461 return new_task;
1462 }
1463
1464
1465 // ------------------------------------------------------------------
1466 // CompileBroker::allocate_task
1467 //
1468 // Allocate a CompileTask, from the free list if possible.
1469 CompileTask* CompileBroker::allocate_task() {
1470 MutexLocker locker(CompileTaskAlloc_lock);
1471 CompileTask* task = NULL;
1472 if (_task_free_list != NULL) {
1473 task = _task_free_list;
1474 _task_free_list = task->next();
1475 task->set_next(NULL);
1476 } else {
1477 task = new CompileTask();
1478 task->set_next(NULL);
1479 }
1480 return task;
1481 }
1482
1483
1484 // ------------------------------------------------------------------
1485 // CompileBroker::free_task
1486 //
1487 // Add a task to the free list.
1488 void CompileBroker::free_task(CompileTask* task) {
1489 MutexLocker locker(CompileTaskAlloc_lock);
1490 task->free();
1491 task->set_next(_task_free_list);
1492 _task_free_list = task;
1493 }
1494
1495
1496 // ------------------------------------------------------------------
1497 // CompileBroker::wait_for_completion
1498 //
1499 // Wait for the given method CompileTask to complete.
1500 void CompileBroker::wait_for_completion(CompileTask* task) {
1501 if (CIPrintCompileQueue) {
1502 tty->print_cr("BLOCKING FOR COMPILE");
1503 }
1504
1505 assert(task->is_blocking(), "can only wait on blocking task");
1506
1507 JavaThread *thread = JavaThread::current();
1508 thread->set_blocked_on_compilation(true);
1509
1510 methodHandle method(thread, task->method());
1511 {
1512 MutexLocker waiter(task->lock(), thread);
1513
1514 while (!task->is_complete())
1515 task->lock()->wait();
1516 }
1517 // It is harmless to check this status without the lock, because
1518 // completion is a stable property (until the task object is recycled).
1519 assert(task->is_complete(), "Compilation should have completed");
1520 assert(task->code_handle() == NULL, "must be reset");
1521
1522 thread->set_blocked_on_compilation(false);
1523
1524 // By convention, the waiter is responsible for recycling a
1525 // blocking CompileTask. Since there is only one waiter ever
1526 // waiting on a CompileTask, we know that no one else will
1527 // be using this CompileTask; we can free it.
1528 free_task(task);
1529 }
1530
1531 // Initialize compiler thread(s) + compiler object(s). The postcondition
1532 // of this function is that the compiler runtimes are initialized and that
1533 //compiler threads can start compiling.
1534 bool CompileBroker::init_compiler_runtime() {
1535 CompilerThread* thread = CompilerThread::current();
1536 AbstractCompiler* comp = thread->compiler();
1537 // Final sanity check - the compiler object must exist
1538 guarantee(comp != NULL, "Compiler object must exist");
1539
1540 int system_dictionary_modification_counter;
1541 {
1542 MutexLocker locker(Compile_lock, thread);
1543 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1544 }
1545
1546 {
1547 // Must switch to native to allocate ci_env
1548 ThreadToNativeFromVM ttn(thread);
1549 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1550 // Cache Jvmti state
1551 ci_env.cache_jvmti_state();
1552 // Cache DTrace flags
1553 ci_env.cache_dtrace_flags();
1554
1555 // Switch back to VM state to do compiler initialization
1556 ThreadInVMfromNative tv(thread);
1557 ResetNoHandleMark rnhm;
1558
1559
1560 if (!comp->is_shark()) {
1561 // Perform per-thread and global initializations
1562 comp->initialize();
1563 }
1564 }
1565
1566 if (comp->is_failed()) {
1567 disable_compilation_forever();
1568 // If compiler initialization failed, no compiler thread that is specific to a
1569 // particular compiler runtime will ever start to compile methods.
1570
1571 shutdown_compiler_runtime(comp, thread);
1572 return false;
1573 }
1574
1575 // C1 specific check
1576 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1577 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1578 return false;
1579 }
1580
1581 return true;
1582 }
1583
1584 // If C1 and/or C2 initialization failed, we shut down all compilation.
1585 // We do this to keep things simple. This can be changed if it ever turns out to be
1586 // a problem.
1587 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1588 // Free buffer blob, if allocated
1589 if (thread->get_buffer_blob() != NULL) {
1590 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1591 CodeCache::free(thread->get_buffer_blob());
1592 }
1593
1594 if (comp->should_perform_shutdown()) {
1595 // There are two reasons for shutting down the compiler
1596 // 1) compiler runtime initialization failed
1597 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1598 warning("Shutting down compiler %s (no space to run compilers)", comp->name());
1599
1600 // Only one thread per compiler runtime object enters here
1601 // Set state to shut down
1602 comp->set_shut_down();
1603
1604 MutexLocker mu(MethodCompileQueue_lock, thread);
1605 CompileQueue* queue;
1606 if (_c1_method_queue != NULL) {
1607 _c1_method_queue->delete_all();
1608 queue = _c1_method_queue;
1609 _c1_method_queue = NULL;
1610 delete _c1_method_queue;
1611 }
1612
1613 if (_c2_method_queue != NULL) {
1614 _c2_method_queue->delete_all();
1615 queue = _c2_method_queue;
1616 _c2_method_queue = NULL;
1617 delete _c2_method_queue;
1618 }
1619
1620 // We could delete compiler runtimes also. However, there are references to
1621 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1622 // fail. This can be done later if necessary.
1623 }
1624 }
1625
1626 // ------------------------------------------------------------------
1627 // CompileBroker::compiler_thread_loop
1628 //
1629 // The main loop run by a CompilerThread.
1630 void CompileBroker::compiler_thread_loop() {
1631 CompilerThread* thread = CompilerThread::current();
1632 CompileQueue* queue = thread->queue();
1633 // For the thread that initializes the ciObjectFactory
1634 // this resource mark holds all the shared objects
1635 ResourceMark rm;
1636
1637 // First thread to get here will initialize the compiler interface
1638
1639 if (!ciObjectFactory::is_initialized()) {
1640 ASSERT_IN_VM;
1641 MutexLocker only_one (CompileThread_lock, thread);
1642 if (!ciObjectFactory::is_initialized()) {
1643 ciObjectFactory::initialize();
1644 }
1645 }
1646
1647 // Open a log.
1648 if (LogCompilation) {
1649 init_compiler_thread_log();
1650 }
1651 CompileLog* log = thread->log();
1652 if (log != NULL) {
1653 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1654 thread->name(),
1655 os::current_thread_id(),
1656 os::current_process_id());
1657 log->stamp();
1658 log->end_elem();
1659 }
1660
1661 // If compiler thread/runtime initialization fails, exit the compiler thread
1662 if (!init_compiler_runtime()) {
1663 return;
1664 }
1665
1666 // Poll for new compilation tasks as long as the JVM runs. Compilation
1667 // should only be disabled if something went wrong while initializing the
1668 // compiler runtimes. This, in turn, should not happen. The only known case
1669 // when compiler runtime initialization fails is if there is not enough free
1670 // space in the code cache to generate the necessary stubs, etc.
1671 while (!is_compilation_disabled_forever()) {
1672 // We need this HandleMark to avoid leaking VM handles.
1673 HandleMark hm(thread);
1674
1675 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1676 // the code cache is really full
1677 handle_full_code_cache();
1678 }
1679
1680 CompileTask* task = queue->get();
1681 if (task == NULL) {
1682 continue;
1683 }
1684
1685 // Give compiler threads an extra quanta. They tend to be bursty and
1686 // this helps the compiler to finish up the job.
1687 if( CompilerThreadHintNoPreempt )
1688 os::hint_no_preempt();
1689
1690 // trace per thread time and compile statistics
1691 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1692 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1693
1694 // Assign the task to the current thread. Mark this compilation
1695 // thread as active for the profiler.
1696 CompileTaskWrapper ctw(task);
1697 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1698 task->set_code_handle(&result_handle);
1699 methodHandle method(thread, task->method());
1700
1701 // Never compile a method if breakpoints are present in it
1702 if (method()->number_of_breakpoints() == 0) {
1703 // Compile the method.
1704 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1705 #ifdef COMPILER1
1706 // Allow repeating compilations for the purpose of benchmarking
1707 // compile speed. This is not useful for customers.
1708 if (CompilationRepeat != 0) {
1709 int compile_count = CompilationRepeat;
1710 while (compile_count > 0) {
1711 invoke_compiler_on_method(task);
1712 nmethod* nm = method->code();
1713 if (nm != NULL) {
1714 nm->make_zombie();
1715 method->clear_code();
1716 }
1717 compile_count--;
1718 }
1719 }
1720 #endif /* COMPILER1 */
1721 invoke_compiler_on_method(task);
1722 } else {
1723 // After compilation is disabled, remove remaining methods from queue
1724 method->clear_queued_for_compilation();
1725 }
1726 }
1727 }
1728
1729 // Shut down compiler runtime
1730 shutdown_compiler_runtime(thread->compiler(), thread);
1731 }
1732
1733 // ------------------------------------------------------------------
1734 // CompileBroker::init_compiler_thread_log
1735 //
1736 // Set up state required by +LogCompilation.
1737 void CompileBroker::init_compiler_thread_log() {
1738 CompilerThread* thread = CompilerThread::current();
1739 char file_name[4*K];
1740 FILE* fp = NULL;
1741 intx thread_id = os::current_thread_id();
1742 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1743 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1744 if (dir == NULL) {
1745 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1746 thread_id, os::current_process_id());
1747 } else {
1748 jio_snprintf(file_name, sizeof(file_name),
1749 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1750 os::file_separator(), thread_id, os::current_process_id());
1751 }
1752
1753 fp = fopen(file_name, "at");
1754 if (fp != NULL) {
1755 if (LogCompilation && Verbose) {
1756 tty->print_cr("Opening compilation log %s", file_name);
1757 }
1758 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1759 thread->init_log(log);
1760
1761 if (xtty != NULL) {
1762 ttyLocker ttyl;
1763 // Record any per thread log files
1764 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name);
1765 }
1766 return;
1767 }
1768 }
1769 warning("Cannot open log file: %s", file_name);
1770 }
1771
1772 // ------------------------------------------------------------------
1773 // CompileBroker::set_should_block
1774 //
1775 // Set _should_block.
1776 // Call this from the VM, with Threads_lock held and a safepoint requested.
1777 void CompileBroker::set_should_block() {
1778 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1779 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1780 #ifndef PRODUCT
1781 if (PrintCompilation && (Verbose || WizardMode))
1782 tty->print_cr("notifying compiler thread pool to block");
1783 #endif
1784 _should_block = true;
1785 }
1786
1787 // ------------------------------------------------------------------
1788 // CompileBroker::maybe_block
1789 //
1790 // Call this from the compiler at convenient points, to poll for _should_block.
1791 void CompileBroker::maybe_block() {
1792 if (_should_block) {
1793 #ifndef PRODUCT
1794 if (PrintCompilation && (Verbose || WizardMode))
1795 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1796 #endif
1797 ThreadInVMfromNative tivfn(JavaThread::current());
1798 }
1799 }
1800
1801 // wrapper for CodeCache::print_summary()
1802 static void codecache_print(bool detailed)
1803 {
1804 ResourceMark rm;
1805 stringStream s;
1806 // Dump code cache into a buffer before locking the tty,
1807 {
1808 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1809 CodeCache::print_summary(&s, detailed);
1810 }
1811 ttyLocker ttyl;
1812 tty->print(s.as_string());
1813 }
1814
1815 // ------------------------------------------------------------------
1816 // CompileBroker::invoke_compiler_on_method
1817 //
1818 // Compile a method.
1819 //
1820 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1821 if (PrintCompilation) {
1822 ResourceMark rm;
1823 task->print_line();
1824 }
1825 elapsedTimer time;
1826
1827 CompilerThread* thread = CompilerThread::current();
1828 ResourceMark rm(thread);
1829
1830 if (LogEvents) {
1831 _compilation_log->log_compile(thread, task);
1832 }
1833
1834 // Common flags.
1835 uint compile_id = task->compile_id();
1836 int osr_bci = task->osr_bci();
1837 bool is_osr = (osr_bci != standard_entry_bci);
1838 bool should_log = (thread->log() != NULL);
1839 bool should_break = false;
1840 int task_level = task->comp_level();
1841 {
1842 // create the handle inside it's own block so it can't
1843 // accidentally be referenced once the thread transitions to
1844 // native. The NoHandleMark before the transition should catch
1845 // any cases where this occurs in the future.
1846 methodHandle method(thread, task->method());
1847 should_break = check_break_at(method, compile_id, is_osr);
1848 if (should_log && !CompilerOracle::should_log(method)) {
1849 should_log = false;
1850 }
1851 assert(!method->is_native(), "no longer compile natives");
1852
1853 // Save information about this method in case of failure.
1854 set_last_compile(thread, method, is_osr, task_level);
1855
1856 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1857 }
1858
1859 // Allocate a new set of JNI handles.
1860 push_jni_handle_block();
1861 Method* target_handle = task->method();
1862 int compilable = ciEnv::MethodCompilable;
1863 {
1864 int system_dictionary_modification_counter;
1865 {
1866 MutexLocker locker(Compile_lock, thread);
1867 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1868 }
1869
1870 NoHandleMark nhm;
1871 ThreadToNativeFromVM ttn(thread);
1872
1873 ciEnv ci_env(task, system_dictionary_modification_counter);
1874 if (should_break) {
1875 ci_env.set_break_at_compile(true);
1876 }
1877 if (should_log) {
1878 ci_env.set_log(thread->log());
1879 }
1880 assert(thread->env() == &ci_env, "set by ci_env");
1881 // The thread-env() field is cleared in ~CompileTaskWrapper.
1882
1883 // Cache Jvmti state
1884 ci_env.cache_jvmti_state();
1885
1886 // Cache DTrace flags
1887 ci_env.cache_dtrace_flags();
1888
1889 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1890
1891 TraceTime t1("compilation", &time);
1892 EventCompilation event;
1893
1894 AbstractCompiler *comp = compiler(task_level);
1895 if (comp == NULL) {
1896 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1897 } else {
1898 comp->compile_method(&ci_env, target, osr_bci);
1899 }
1900
1901 if (!ci_env.failing() && task->code() == NULL) {
1902 //assert(false, "compiler should always document failure");
1903 // The compiler elected, without comment, not to register a result.
1904 // Do not attempt further compilations of this method.
1905 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1906 }
1907
1908 // Copy this bit to the enclosing block:
1909 compilable = ci_env.compilable();
1910
1911 if (ci_env.failing()) {
1912 const char* retry_message = ci_env.retry_message();
1913 if (_compilation_log != NULL) {
1914 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1915 }
1916 if (PrintCompilation) {
1917 FormatBufferResource msg = retry_message != NULL ?
1918 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1919 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
1920 task->print_compilation(tty, msg);
1921 }
1922 } else {
1923 task->mark_success();
1924 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1925 if (_compilation_log != NULL) {
1926 nmethod* code = task->code();
1927 if (code != NULL) {
1928 _compilation_log->log_nmethod(thread, code);
1929 }
1930 }
1931 }
1932 // simulate crash during compilation
1933 assert(task->compile_id() != CICrashAt, "just as planned");
1934 if (event.should_commit()) {
1935 event.set_method(target->get_Method());
1936 event.set_compileID(compile_id);
1937 event.set_compileLevel(task->comp_level());
1938 event.set_succeded(task->is_success());
1939 event.set_isOsr(is_osr);
1940 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1941 event.set_inlinedBytes(task->num_inlined_bytecodes());
1942 event.commit();
1943 }
1944 }
1945 pop_jni_handle_block();
1946
1947 methodHandle method(thread, task->method());
1948
1949 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1950
1951 collect_statistics(thread, time, task);
1952
1953 if (PrintCompilation && PrintCompilation2) {
1954 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
1955 tty->print("%4d ", compile_id); // print compilation number
1956 tty->print("%s ", (is_osr ? "%" : " "));
1957 if (task->code() != NULL) {
1958 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1959 }
1960 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1961 }
1962
1963 if (PrintCodeCacheOnCompilation)
1964 codecache_print(/* detailed= */ false);
1965
1966 // Disable compilation, if required.
1967 switch (compilable) {
1968 case ciEnv::MethodCompilable_never:
1969 if (is_osr)
1970 method->set_not_osr_compilable_quietly();
1971 else
1972 method->set_not_compilable_quietly();
1973 break;
1974 case ciEnv::MethodCompilable_not_at_tier:
1975 if (is_osr)
1976 method->set_not_osr_compilable_quietly(task_level);
1977 else
1978 method->set_not_compilable_quietly(task_level);
1979 break;
1980 }
1981
1982 // Note that the queued_for_compilation bits are cleared without
1983 // protection of a mutex. [They were set by the requester thread,
1984 // when adding the task to the complie queue -- at which time the
1985 // compile queue lock was held. Subsequently, we acquired the compile
1986 // queue lock to get this task off the compile queue; thus (to belabour
1987 // the point somewhat) our clearing of the bits must be occurring
1988 // only after the setting of the bits. See also 14012000 above.
1989 method->clear_queued_for_compilation();
1990
1991 #ifdef ASSERT
1992 if (CollectedHeap::fired_fake_oom()) {
1993 // The current compile received a fake OOM during compilation so
1994 // go ahead and exit the VM since the test apparently succeeded
1995 tty->print_cr("*** Shutting down VM after successful fake OOM");
1996 vm_exit(0);
1997 }
1998 #endif
1999 }
2000
2001 /**
2002 * The CodeCache is full. Print out warning and disable compilation
2003 * or try code cache cleaning so compilation can continue later.
2004 */
2005 void CompileBroker::handle_full_code_cache() {
2006 UseInterpreter = true;
2007 if (UseCompiler || AlwaysCompileLoopMethods ) {
2008 if (xtty != NULL) {
2009 ResourceMark rm;
2010 stringStream s;
2011 // Dump code cache state into a buffer before locking the tty,
2012 // because log_state() will use locks causing lock conflicts.
2013 CodeCache::log_state(&s);
2014 // Lock to prevent tearing
2015 ttyLocker ttyl;
2016 xtty->begin_elem("code_cache_full");
2017 xtty->print(s.as_string());
2018 xtty->stamp();
2019 xtty->end_elem();
2020 }
2021
2022 CodeCache::report_codemem_full();
2023
2024 #ifndef PRODUCT
2025 if (CompileTheWorld || ExitOnFullCodeCache) {
2026 codecache_print(/* detailed= */ true);
2027 before_exit(JavaThread::current());
2028 exit_globals(); // will delete tty
2029 vm_direct_exit(CompileTheWorld ? 0 : 1);
2030 }
2031 #endif
2032 if (UseCodeCacheFlushing) {
2033 // Since code cache is full, immediately stop new compiles
2034 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2035 NMethodSweeper::log_sweep("disable_compiler");
2036 }
2037 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2038 // without having to consider the state in which the current thread is.
2039 ThreadInVMfromUnknown in_vm;
2040 NMethodSweeper::possibly_sweep();
2041 } else {
2042 disable_compilation_forever();
2043 }
2044
2045 // Print warning only once
2046 if (should_print_compiler_warning()) {
2047 warning("CodeCache is full. Compiler has been disabled.");
2048 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2049 codecache_print(/* detailed= */ true);
2050 }
2051 }
2052 }
2053
2054 // ------------------------------------------------------------------
2055 // CompileBroker::set_last_compile
2056 //
2057 // Record this compilation for debugging purposes.
2058 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2059 ResourceMark rm;
2060 char* method_name = method->name()->as_C_string();
2061 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2062 char current_method[CompilerCounters::cmname_buffer_length];
2063 size_t maxLen = CompilerCounters::cmname_buffer_length;
2064
2065 if (UsePerfData) {
2066 const char* class_name = method->method_holder()->name()->as_C_string();
2067
2068 size_t s1len = strlen(class_name);
2069 size_t s2len = strlen(method_name);
2070
2071 // check if we need to truncate the string
2072 if (s1len + s2len + 2 > maxLen) {
2073
2074 // the strategy is to lop off the leading characters of the
2075 // class name and the trailing characters of the method name.
2076
2077 if (s2len + 2 > maxLen) {
2078 // lop of the entire class name string, let snprintf handle
2079 // truncation of the method name.
2080 class_name += s1len; // null string
2081 }
2082 else {
2083 // lop off the extra characters from the front of the class name
2084 class_name += ((s1len + s2len + 2) - maxLen);
2085 }
2086 }
2087
2088 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2089 }
2090
2091 if (CICountOSR && is_osr) {
2092 _last_compile_type = osr_compile;
2093 } else {
2094 _last_compile_type = normal_compile;
2095 }
2096 _last_compile_level = comp_level;
2097
2098 if (UsePerfData) {
2099 CompilerCounters* counters = thread->counters();
2100 counters->set_current_method(current_method);
2101 counters->set_compile_type((jlong)_last_compile_type);
2102 }
2103 }
2104
2105
2106 // ------------------------------------------------------------------
2107 // CompileBroker::push_jni_handle_block
2108 //
2109 // Push on a new block of JNI handles.
2110 void CompileBroker::push_jni_handle_block() {
2111 JavaThread* thread = JavaThread::current();
2112
2113 // Allocate a new block for JNI handles.
2114 // Inlined code from jni_PushLocalFrame()
2115 JNIHandleBlock* java_handles = thread->active_handles();
2116 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2117 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2118 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2119 thread->set_active_handles(compile_handles);
2120 }
2121
2122
2123 // ------------------------------------------------------------------
2124 // CompileBroker::pop_jni_handle_block
2125 //
2126 // Pop off the current block of JNI handles.
2127 void CompileBroker::pop_jni_handle_block() {
2128 JavaThread* thread = JavaThread::current();
2129
2130 // Release our JNI handle block
2131 JNIHandleBlock* compile_handles = thread->active_handles();
2132 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2133 thread->set_active_handles(java_handles);
2134 compile_handles->set_pop_frame_link(NULL);
2135 JNIHandleBlock::release_block(compile_handles, thread); // may block
2136 }
2137
2138
2139 // ------------------------------------------------------------------
2140 // CompileBroker::check_break_at
2141 //
2142 // Should the compilation break at the current compilation.
2143 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2144 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2145 return true;
2146 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2147 return true;
2148 } else {
2149 return (compile_id == CIBreakAt);
2150 }
2151 }
2152
2153 // ------------------------------------------------------------------
2154 // CompileBroker::collect_statistics
2155 //
2156 // Collect statistics about the compilation.
2157
2158 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2159 bool success = task->is_success();
2160 methodHandle method (thread, task->method());
2161 uint compile_id = task->compile_id();
2162 bool is_osr = (task->osr_bci() != standard_entry_bci);
2163 nmethod* code = task->code();
2164 CompilerCounters* counters = thread->counters();
2165
2166 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2167 MutexLocker locker(CompileStatistics_lock);
2168
2169 // _perf variables are production performance counters which are
2170 // updated regardless of the setting of the CITime and CITimeEach flags
2171 //
2172 if (!success) {
2173 _total_bailout_count++;
2174 if (UsePerfData) {
2175 _perf_last_failed_method->set_value(counters->current_method());
2176 _perf_last_failed_type->set_value(counters->compile_type());
2177 _perf_total_bailout_count->inc();
2178 }
2179 } else if (code == NULL) {
2180 if (UsePerfData) {
2181 _perf_last_invalidated_method->set_value(counters->current_method());
2182 _perf_last_invalidated_type->set_value(counters->compile_type());
2183 _perf_total_invalidated_count->inc();
2184 }
2185 _total_invalidated_count++;
2186 } else {
2187 // Compilation succeeded
2188
2189 // update compilation ticks - used by the implementation of
2190 // java.lang.management.CompilationMBean
2191 _perf_total_compilation->inc(time.ticks());
2192
2193 _t_total_compilation.add(time);
2194 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2195
2196 if (CITime) {
2197 if (is_osr) {
2198 _t_osr_compilation.add(time);
2199 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2200 } else {
2201 _t_standard_compilation.add(time);
2202 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2203 }
2204 }
2205
2206 if (UsePerfData) {
2207 // save the name of the last method compiled
2208 _perf_last_method->set_value(counters->current_method());
2209 _perf_last_compile_type->set_value(counters->compile_type());
2210 _perf_last_compile_size->set_value(method->code_size() +
2211 task->num_inlined_bytecodes());
2212 if (is_osr) {
2213 _perf_osr_compilation->inc(time.ticks());
2214 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2215 } else {
2216 _perf_standard_compilation->inc(time.ticks());
2217 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2218 }
2219 }
2220
2221 if (CITimeEach) {
2222 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2223 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2224 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2225 }
2226
2227 // Collect counts of successful compilations
2228 _sum_nmethod_size += code->total_size();
2229 _sum_nmethod_code_size += code->insts_size();
2230 _total_compile_count++;
2231
2232 if (UsePerfData) {
2233 _perf_sum_nmethod_size->inc( code->total_size());
2234 _perf_sum_nmethod_code_size->inc(code->insts_size());
2235 _perf_total_compile_count->inc();
2236 }
2237
2238 if (is_osr) {
2239 if (UsePerfData) _perf_total_osr_compile_count->inc();
2240 _total_osr_compile_count++;
2241 } else {
2242 if (UsePerfData) _perf_total_standard_compile_count->inc();
2243 _total_standard_compile_count++;
2244 }
2245 }
2246 // set the current method for the thread to null
2247 if (UsePerfData) counters->set_current_method("");
2248 }
2249
2250 const char* CompileBroker::compiler_name(int comp_level) {
2251 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2252 if (comp == NULL) {
2253 return "no compiler";
2254 } else {
2255 return (comp->name());
2256 }
2257 }
2258
2259 void CompileBroker::print_times() {
2260 tty->cr();
2261 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2262 tty->print_cr("------------------------------------------------");
2263 //0000000000111111111122222222223333333333444444444455555555556666666666
2264 //0123456789012345678901234567890123456789012345678901234567890123456789
2265 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2266 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2267 CompileBroker::_t_standard_compilation.seconds(),
2268 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2269 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);
2270
2271 AbstractCompiler *comp = compiler(CompLevel_simple);
2272 if (comp != NULL) {
2273 comp->print_timers();
2274 }
2275 comp = compiler(CompLevel_full_optimization);
2276 if (comp != NULL) {
2277 comp->print_timers();
2278 }
2279 tty->cr();
2280 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2281 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2282 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2283 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2284 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2285 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2286 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2287 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2288 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2289 tty->cr();
2290 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2291 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2292 }
2293
2294 // Debugging output for failure
2295 void CompileBroker::print_last_compile() {
2296 if ( _last_compile_level != CompLevel_none &&
2297 compiler(_last_compile_level) != NULL &&
2298 _last_method_compiled != NULL &&
2299 _last_compile_type != no_compile) {
2300 if (_last_compile_type == osr_compile) {
2301 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2302 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2303 } else {
2304 tty->print_cr("Last parse: %d+++(%d) %s",
2305 _compilation_id, _last_compile_level, _last_method_compiled);
2306 }
2307 }
2308 }
2309
2310
2311 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2312 #ifndef PRODUCT
2313 st->print_cr("Compiler thread printing unimplemented.");
2314 st->cr();
2315 #endif
2316 }