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