1 /*
2 * Copyright (c) 1999, 2014, 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/atomic.inline.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/init.hpp"
42 #include "runtime/interfaceSupport.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/sweeper.hpp"
47 #include "trace/tracing.hpp"
48 #include "utilities/dtrace.hpp"
49 #include "utilities/events.hpp"
50 #ifdef COMPILER1
51 #include "c1/c1_Compiler.hpp"
52 #endif
53 #ifdef COMPILER2
54 #include "opto/c2compiler.hpp"
55 #endif
56 #ifdef SHARK
57 #include "shark/sharkCompiler.hpp"
58 #endif
59
60 #ifdef DTRACE_ENABLED
61
62 // Only bother with this argument setup if dtrace is available
63
64 #ifndef USDT2
65 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
66 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
67 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
68 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
69
70 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
71 { \
72 Symbol* klass_name = (method)->klass_name(); \
73 Symbol* name = (method)->name(); \
74 Symbol* signature = (method)->signature(); \
75 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
76 comp_name, strlen(comp_name), \
77 klass_name->bytes(), klass_name->utf8_length(), \
78 name->bytes(), name->utf8_length(), \
79 signature->bytes(), signature->utf8_length()); \
80 }
81
82 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
83 { \
84 Symbol* klass_name = (method)->klass_name(); \
85 Symbol* name = (method)->name(); \
86 Symbol* signature = (method)->signature(); \
87 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
88 comp_name, strlen(comp_name), \
89 klass_name->bytes(), klass_name->utf8_length(), \
90 name->bytes(), name->utf8_length(), \
91 signature->bytes(), signature->utf8_length(), (success)); \
92 }
93
94 #else /* USDT2 */
95
96 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
97 { \
98 Symbol* klass_name = (method)->klass_name(); \
99 Symbol* name = (method)->name(); \
100 Symbol* signature = (method)->signature(); \
101 HOTSPOT_METHOD_COMPILE_BEGIN( \
102 comp_name, strlen(comp_name), \
103 (char *) klass_name->bytes(), klass_name->utf8_length(), \
104 (char *) name->bytes(), name->utf8_length(), \
105 (char *) signature->bytes(), signature->utf8_length()); \
106 }
107
108 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
109 { \
110 Symbol* klass_name = (method)->klass_name(); \
111 Symbol* name = (method)->name(); \
112 Symbol* signature = (method)->signature(); \
113 HOTSPOT_METHOD_COMPILE_END( \
114 comp_name, strlen(comp_name), \
115 (char *) klass_name->bytes(), klass_name->utf8_length(), \
116 (char *) name->bytes(), name->utf8_length(), \
117 (char *) signature->bytes(), signature->utf8_length(), (success)); \
118 }
119 #endif /* USDT2 */
120
121 #else // ndef DTRACE_ENABLED
122
123 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
124 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
125
126 #endif // ndef DTRACE_ENABLED
127
128 bool CompileBroker::_initialized = false;
129 volatile bool CompileBroker::_should_block = false;
130 volatile jint CompileBroker::_print_compilation_warning = 0;
131 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
132
133 // The installed compiler(s)
134 AbstractCompiler* CompileBroker::_compilers[2];
135
136 // These counters are used to assign an unique ID to each compilation.
137 volatile jint CompileBroker::_compilation_id = 0;
138 volatile jint CompileBroker::_osr_compilation_id = 0;
139
140 // Debugging information
141 int CompileBroker::_last_compile_type = no_compile;
142 int CompileBroker::_last_compile_level = CompLevel_none;
143 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
144
145 // Performance counters
146 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
148 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
149
150 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
154 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
155
156 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
160
161 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
163 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
165 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
166 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
167 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
168
169 // Timers and counters for generating statistics
170 elapsedTimer CompileBroker::_t_total_compilation;
171 elapsedTimer CompileBroker::_t_osr_compilation;
172 elapsedTimer CompileBroker::_t_standard_compilation;
173
174 int CompileBroker::_total_bailout_count = 0;
175 int CompileBroker::_total_invalidated_count = 0;
176 int CompileBroker::_total_compile_count = 0;
177 int CompileBroker::_total_osr_compile_count = 0;
178 int CompileBroker::_total_standard_compile_count = 0;
179
180 int CompileBroker::_sum_osr_bytes_compiled = 0;
181 int CompileBroker::_sum_standard_bytes_compiled = 0;
182 int CompileBroker::_sum_nmethod_size = 0;
183 int CompileBroker::_sum_nmethod_code_size = 0;
184
185 long CompileBroker::_peak_compilation_time = 0;
186
187 CompileQueue* CompileBroker::_c2_method_queue = NULL;
188 CompileQueue* CompileBroker::_c1_method_queue = NULL;
189 CompileTask* CompileBroker::_task_free_list = NULL;
190
191 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
192
193
194 class CompilationLog : public StringEventLog {
195 public:
196 CompilationLog() : StringEventLog("Compilation events") {
197 }
198
199 void log_compile(JavaThread* thread, CompileTask* task) {
200 StringLogMessage lm;
201 stringStream sstr = lm.stream();
202 // msg.time_stamp().update_to(tty->time_stamp().ticks());
203 task->print_compilation(&sstr, NULL, true);
204 log(thread, "%s", (const char*)lm);
205 }
206
207 void log_nmethod(JavaThread* thread, nmethod* nm) {
208 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
209 nm->compile_id(), nm->is_osr_method() ? "%" : "",
210 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
211 }
212
213 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
214 StringLogMessage lm;
215 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
216 if (retry_message != NULL) {
217 lm.append(" (%s)", retry_message);
218 }
219 lm.print("\n");
220 log(thread, "%s", (const char*)lm);
221 }
222 };
223
224 static CompilationLog* _compilation_log = NULL;
225
226 void compileBroker_init() {
227 if (LogEvents) {
228 _compilation_log = new CompilationLog();
229 }
230 }
231
232 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
233 CompilerThread* thread = CompilerThread::current();
234 thread->set_task(task);
235 CompileLog* log = thread->log();
236 if (log != NULL) task->log_task_start(log);
237 }
238
239 CompileTaskWrapper::~CompileTaskWrapper() {
240 CompilerThread* thread = CompilerThread::current();
241 CompileTask* task = thread->task();
242 CompileLog* log = thread->log();
243 if (log != NULL) task->log_task_done(log);
244 thread->set_task(NULL);
245 task->set_code_handle(NULL);
246 thread->set_env(NULL);
247 if (task->is_blocking()) {
248 MutexLocker notifier(task->lock(), thread);
249 task->mark_complete();
250 // Notify the waiting thread that the compilation has completed.
251 task->lock()->notify_all();
252 } else {
253 task->mark_complete();
254
255 // By convention, the compiling thread is responsible for
256 // recycling a non-blocking CompileTask.
257 CompileBroker::free_task(task);
258 }
259 }
260
261
262 // ------------------------------------------------------------------
263 // CompileTask::initialize
264 void CompileTask::initialize(int compile_id,
265 methodHandle method,
266 int osr_bci,
267 int comp_level,
268 methodHandle hot_method,
269 int hot_count,
270 const char* comment,
271 bool is_blocking) {
272 assert(!_lock->is_locked(), "bad locking");
273
274 _compile_id = compile_id;
275 _method = method();
276 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
277 _osr_bci = osr_bci;
278 _is_blocking = is_blocking;
279 _comp_level = comp_level;
280 _num_inlined_bytecodes = 0;
281
282 _is_complete = false;
283 _is_success = false;
284 _code_handle = NULL;
285
286 _hot_method = NULL;
287 _hot_method_holder = NULL;
288 _hot_count = hot_count;
289 _time_queued = 0; // tidy
290 _comment = comment;
291 _failure_reason = NULL;
292
293 if (LogCompilation) {
294 _time_queued = os::elapsed_counter();
295 if (hot_method.not_null()) {
296 if (hot_method == method) {
297 _hot_method = _method;
298 } else {
299 _hot_method = hot_method();
300 // only add loader or mirror if different from _method_holder
301 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
302 }
303 }
304 }
305
306 _next = NULL;
307 }
308
309 // ------------------------------------------------------------------
310 // CompileTask::code/set_code
311 nmethod* CompileTask::code() const {
312 if (_code_handle == NULL) return NULL;
313 return _code_handle->code();
314 }
315 void CompileTask::set_code(nmethod* nm) {
316 if (_code_handle == NULL && nm == NULL) return;
317 guarantee(_code_handle != NULL, "");
318 _code_handle->set_code(nm);
319 if (nm == NULL) _code_handle = NULL; // drop the handle also
320 }
321
322 // ------------------------------------------------------------------
323 // CompileTask::free
324 void CompileTask::free() {
325 set_code(NULL);
326 assert(!_lock->is_locked(), "Should not be locked when freed");
327 JNIHandles::destroy_global(_method_holder);
328 JNIHandles::destroy_global(_hot_method_holder);
329 }
330
331
332 void CompileTask::mark_on_stack() {
333 // Mark these methods as something redefine classes cannot remove.
334 _method->set_on_stack(true);
335 if (_hot_method != NULL) {
336 _hot_method->set_on_stack(true);
337 }
338 }
339
340 // ------------------------------------------------------------------
341 // CompileTask::print
342 void CompileTask::print() {
343 tty->print("<CompileTask compile_id=%d ", _compile_id);
344 tty->print("method=");
345 _method->print_name(tty);
346 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
347 _osr_bci, bool_to_str(_is_blocking),
348 bool_to_str(_is_complete), bool_to_str(_is_success));
349 }
350
351
352 // ------------------------------------------------------------------
353 // CompileTask::print_line_on_error
354 //
355 // This function is called by fatal error handler when the thread
356 // causing troubles is a compiler thread.
357 //
358 // Do not grab any lock, do not allocate memory.
359 //
360 // Otherwise it's the same as CompileTask::print_line()
361 //
362 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
363 // print compiler name
364 st->print("%s:", CompileBroker::compiler_name(comp_level()));
365 print_compilation(st);
366 }
367
368 // ------------------------------------------------------------------
369 // CompileTask::print_line
370 void CompileTask::print_line() {
371 ttyLocker ttyl; // keep the following output all in one block
372 // print compiler name if requested
373 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
374 print_compilation();
375 }
376
377
378 // ------------------------------------------------------------------
379 // CompileTask::print_compilation_impl
380 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
381 bool is_osr_method, int osr_bci, bool is_blocking,
382 const char* msg, bool short_form) {
383 if (!short_form) {
384 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
385 }
386 st->print("%4d ", compile_id); // print compilation number
387
388 // For unloaded methods the transition to zombie occurs after the
389 // method is cleared so it's impossible to report accurate
390 // information for that case.
391 bool is_synchronized = false;
392 bool has_exception_handler = false;
393 bool is_native = false;
394 if (method != NULL) {
395 is_synchronized = method->is_synchronized();
396 has_exception_handler = method->has_exception_handler();
397 is_native = method->is_native();
398 }
399 // method attributes
400 const char compile_type = is_osr_method ? '%' : ' ';
401 const char sync_char = is_synchronized ? 's' : ' ';
402 const char exception_char = has_exception_handler ? '!' : ' ';
403 const char blocking_char = is_blocking ? 'b' : ' ';
404 const char native_char = is_native ? 'n' : ' ';
405
406 // print method attributes
407 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
408
409 if (TieredCompilation) {
410 if (comp_level != -1) st->print("%d ", comp_level);
411 else st->print("- ");
412 }
413 st->print(" "); // more indent
414
415 if (method == NULL) {
416 st->print("(method)");
417 } else {
418 method->print_short_name(st);
419 if (is_osr_method) {
420 st->print(" @ %d", osr_bci);
421 }
422 if (method->is_native())
423 st->print(" (native)");
424 else
425 st->print(" (%d bytes)", method->code_size());
426 }
427
428 if (msg != NULL) {
429 st->print(" %s", msg);
430 }
431 if (!short_form) {
432 st->cr();
433 }
434 }
435
436 // ------------------------------------------------------------------
437 // CompileTask::print_inlining
438 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
439 // 1234567
440 st->print(" "); // print timestamp
441 // 1234
442 st->print(" "); // print compilation number
443
444 // method attributes
445 if (method->is_loaded()) {
446 const char sync_char = method->is_synchronized() ? 's' : ' ';
447 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
448 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
449
450 // print method attributes
451 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
452 } else {
453 // %s!bn
454 st->print(" "); // print method attributes
455 }
456
457 if (TieredCompilation) {
458 st->print(" ");
459 }
460 st->print(" "); // more indent
461 st->print(" "); // initial inlining indent
462
463 for (int i = 0; i < inline_level; i++) st->print(" ");
464
465 st->print("@ %d ", bci); // print bci
466 method->print_short_name(st);
467 if (method->is_loaded())
468 st->print(" (%d bytes)", method->code_size());
469 else
470 st->print(" (not loaded)");
471
472 if (msg != NULL) {
473 st->print(" %s", msg);
474 }
475 st->cr();
476 }
477
478 // ------------------------------------------------------------------
479 // CompileTask::print_inline_indent
480 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
481 // 1234567
482 st->print(" "); // print timestamp
483 // 1234
484 st->print(" "); // print compilation number
485 // %s!bn
486 st->print(" "); // print method attributes
487 if (TieredCompilation) {
488 st->print(" ");
489 }
490 st->print(" "); // more indent
491 st->print(" "); // initial inlining indent
492 for (int i = 0; i < inline_level; i++) st->print(" ");
493 }
494
495 // ------------------------------------------------------------------
496 // CompileTask::print_compilation
497 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
498 bool is_osr_method = osr_bci() != InvocationEntryBci;
499 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
500 }
501
502 // ------------------------------------------------------------------
503 // CompileTask::log_task
504 void CompileTask::log_task(xmlStream* log) {
505 Thread* thread = Thread::current();
506 methodHandle method(thread, this->method());
507 ResourceMark rm(thread);
508
509 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
510 log->print(" compile_id='%d'", _compile_id);
511 if (_osr_bci != CompileBroker::standard_entry_bci) {
512 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
513 } // else compile_kind='c2c'
514 if (!method.is_null()) log->method(method);
515 if (_osr_bci != CompileBroker::standard_entry_bci) {
516 log->print(" osr_bci='%d'", _osr_bci);
517 }
518 if (_comp_level != CompLevel_highest_tier) {
519 log->print(" level='%d'", _comp_level);
520 }
521 if (_is_blocking) {
522 log->print(" blocking='1'");
523 }
524 log->stamp();
525 }
526
527
528 // ------------------------------------------------------------------
529 // CompileTask::log_task_queued
530 void CompileTask::log_task_queued() {
531 Thread* thread = Thread::current();
532 ttyLocker ttyl;
533 ResourceMark rm(thread);
534
535 xtty->begin_elem("task_queued");
536 log_task(xtty);
537 if (_comment != NULL) {
538 xtty->print(" comment='%s'", _comment);
539 }
540 if (_hot_method != NULL) {
541 methodHandle hot(thread, _hot_method);
542 methodHandle method(thread, _method);
543 if (hot() != method()) {
544 xtty->method(hot);
545 }
546 }
547 if (_hot_count != 0) {
548 xtty->print(" hot_count='%d'", _hot_count);
549 }
550 xtty->end_elem();
551 }
552
553
554 // ------------------------------------------------------------------
555 // CompileTask::log_task_start
556 void CompileTask::log_task_start(CompileLog* log) {
557 log->begin_head("task");
558 log_task(log);
559 log->end_head();
560 }
561
562
563 // ------------------------------------------------------------------
564 // CompileTask::log_task_done
565 void CompileTask::log_task_done(CompileLog* log) {
566 Thread* thread = Thread::current();
567 methodHandle method(thread, this->method());
568 ResourceMark rm(thread);
569
570 if (!_is_success) {
571 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
572 log->elem("failure reason='%s'", reason);
573 }
574
575 // <task_done ... stamp='1.234'> </task>
576 nmethod* nm = code();
577 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
578 _is_success, nm == NULL ? 0 : nm->content_size(),
579 method->invocation_count());
580 int bec = method->backedge_count();
581 if (bec != 0) log->print(" backedge_count='%d'", bec);
582 // Note: "_is_complete" is about to be set, but is not.
583 if (_num_inlined_bytecodes != 0) {
584 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
585 }
586 log->stamp();
587 log->end_elem();
588 log->tail("task");
589 log->clear_identities(); // next task will have different CI
590 if (log->unflushed_count() > 2000) {
591 log->flush();
592 }
593 log->mark_file_end();
594 }
595
596
597
598 // Add a CompileTask to a CompileQueue
599 void CompileQueue::add(CompileTask* task) {
600 assert(lock()->owned_by_self(), "must own lock");
601
602 task->set_next(NULL);
603 task->set_prev(NULL);
604
605 if (_last == NULL) {
606 // The compile queue is empty.
607 assert(_first == NULL, "queue is empty");
608 _first = task;
609 _last = task;
610 } else {
611 // Append the task to the queue.
612 assert(_last->next() == NULL, "not last");
613 _last->set_next(task);
614 task->set_prev(_last);
615 _last = task;
616 }
617 ++_size;
618
619 // Mark the method as being in the compile queue.
620 task->method()->set_queued_for_compilation();
621
622 if (CIPrintCompileQueue) {
623 print();
624 }
625
626 if (LogCompilation && xtty != NULL) {
627 task->log_task_queued();
628 }
629
630 // Notify CompilerThreads that a task is available.
631 lock()->notify_all();
632 }
633
634 void CompileQueue::delete_all() {
635 assert(lock()->owned_by_self(), "must own lock");
636 if (_first != NULL) {
637 for (CompileTask* task = _first; task != NULL; task = task->next()) {
638 delete task;
639 }
640 _first = NULL;
641 }
642 }
643
644 // ------------------------------------------------------------------
645 // CompileQueue::get
646 //
647 // Get the next CompileTask from a CompileQueue
648 CompileTask* CompileQueue::get() {
649 NMethodSweeper::possibly_sweep();
650
651 MutexLocker locker(lock());
652 // If _first is NULL we have no more compile jobs. There are two reasons for
653 // having no compile jobs: First, we compiled everything we wanted. Second,
654 // we ran out of code cache so compilation has been disabled. In the latter
655 // case we perform code cache sweeps to free memory such that we can re-enable
656 // compilation.
657 while (_first == NULL) {
658 // Exit loop if compilation is disabled forever
659 if (CompileBroker::is_compilation_disabled_forever()) {
660 return NULL;
661 }
662
663 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
664 // Wait a certain amount of time to possibly do another sweep.
665 // We must wait until stack scanning has happened so that we can
666 // transition a method's state from 'not_entrant' to 'zombie'.
667 long wait_time = NmethodSweepCheckInterval * 1000;
668 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
669 // Only one thread at a time can do sweeping. Scale the
670 // wait time according to the number of compiler threads.
671 // As a result, the next sweep is likely to happen every 100ms
672 // with an arbitrary number of threads that do sweeping.
673 wait_time = 100 * CICompilerCount;
674 }
675 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
676 if (timeout) {
677 MutexUnlocker ul(lock());
678 NMethodSweeper::possibly_sweep();
679 }
680 } else {
681 // If there are no compilation tasks and we can compile new jobs
682 // (i.e., there is enough free space in the code cache) there is
683 // no need to invoke the sweeper. As a result, the hotness of methods
684 // remains unchanged. This behavior is desired, since we want to keep
685 // the stable state, i.e., we do not want to evict methods from the
686 // code cache if it is unnecessary.
687 // We need a timed wait here, since compiler threads can exit if compilation
688 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
689 // is not critical and we do not want idle compiler threads to wake up too often.
690 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
691 }
692 }
693
694 if (CompileBroker::is_compilation_disabled_forever()) {
695 return NULL;
696 }
697
698 CompileTask* task;
699 {
700 No_Safepoint_Verifier nsv;
701 task = CompilationPolicy::policy()->select_task(this);
702 }
703 remove(task);
704 purge_stale_tasks(); // may temporarily release MCQ lock
705 return task;
706 }
707
708 // Clean & deallocate stale compile tasks.
709 // Temporarily releases MethodCompileQueue lock.
710 void CompileQueue::purge_stale_tasks() {
711 assert(lock()->owned_by_self(), "must own lock");
712 if (_first_stale != NULL) {
713 // Stale tasks are purged when MCQ lock is released,
714 // but _first_stale updates are protected by MCQ lock.
715 // Once task processing starts and MCQ lock is released,
716 // other compiler threads can reuse _first_stale.
717 CompileTask* head = _first_stale;
718 _first_stale = NULL;
719 {
720 MutexUnlocker ul(lock());
721 for (CompileTask* task = head; task != NULL; ) {
722 CompileTask* next_task = task->next();
723 CompileTaskWrapper ctw(task); // Frees the task
724 task->set_failure_reason("stale task");
725 task = next_task;
726 }
727 }
728 }
729 }
730
731 void CompileQueue::remove(CompileTask* task) {
732 assert(lock()->owned_by_self(), "must own lock");
733 if (task->prev() != NULL) {
734 task->prev()->set_next(task->next());
735 } else {
736 // max is the first element
737 assert(task == _first, "Sanity");
738 _first = task->next();
739 }
740
741 if (task->next() != NULL) {
742 task->next()->set_prev(task->prev());
743 } else {
744 // max is the last element
745 assert(task == _last, "Sanity");
746 _last = task->prev();
747 }
748 --_size;
749 }
750
751 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
752 assert(lock()->owned_by_self(), "must own lock");
753 remove(task);
754
755 // Enqueue the task for reclamation (should be done outside MCQ lock)
756 task->set_next(_first_stale);
757 task->set_prev(NULL);
758 _first_stale = task;
759 }
760
761 // methods in the compile queue need to be marked as used on the stack
762 // so that they don't get reclaimed by Redefine Classes
763 void CompileQueue::mark_on_stack() {
764 CompileTask* task = _first;
765 while (task != NULL) {
766 task->mark_on_stack();
767 task = task->next();
768 }
769 }
770
771 // ------------------------------------------------------------------
772 // CompileQueue::print
773 void CompileQueue::print() {
774 tty->print_cr("Contents of %s", name());
775 tty->print_cr("----------------------");
776 CompileTask* task = _first;
777 while (task != NULL) {
778 task->print_line();
779 task = task->next();
780 }
781 tty->print_cr("----------------------");
782 }
783
784 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
785
786 _current_method[0] = '\0';
787 _compile_type = CompileBroker::no_compile;
788
789 if (UsePerfData) {
790 ResourceMark rm;
791
792 // create the thread instance name space string - don't create an
793 // instance subspace if instance is -1 - keeps the adapterThread
794 // counters from having a ".0" namespace.
795 const char* thread_i = (instance == -1) ? thread_name :
796 PerfDataManager::name_space(thread_name, instance);
797
798
799 char* name = PerfDataManager::counter_name(thread_i, "method");
800 _perf_current_method =
801 PerfDataManager::create_string_variable(SUN_CI, name,
802 cmname_buffer_length,
803 _current_method, CHECK);
804
805 name = PerfDataManager::counter_name(thread_i, "type");
806 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
807 PerfData::U_None,
808 (jlong)_compile_type,
809 CHECK);
810
811 name = PerfDataManager::counter_name(thread_i, "time");
812 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
813 PerfData::U_Ticks, CHECK);
814
815 name = PerfDataManager::counter_name(thread_i, "compiles");
816 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
817 PerfData::U_Events, CHECK);
818 }
819 }
820
821 // ------------------------------------------------------------------
822 // CompileBroker::compilation_init
823 //
824 // Initialize the Compilation object
825 void CompileBroker::compilation_init() {
826 _last_method_compiled[0] = '\0';
827
828 // No need to initialize compilation system if we do not use it.
829 if (!UseCompiler) {
830 return;
831 }
832 #ifndef SHARK
833 // Set the interface to the current compiler(s).
834 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
835 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
836 #ifdef COMPILER1
837 if (c1_count > 0) {
838 _compilers[0] = new Compiler();
839 }
840 #endif // COMPILER1
841
842 #ifdef COMPILER2
843 if (c2_count > 0) {
844 _compilers[1] = new C2Compiler();
845 }
846 #endif // COMPILER2
847
848 #else // SHARK
849 int c1_count = 0;
850 int c2_count = 1;
851
852 _compilers[1] = new SharkCompiler();
853 #endif // SHARK
854
855 // Initialize the CompileTask free list
856 _task_free_list = NULL;
857
858 // Start the CompilerThreads
859 init_compiler_threads(c1_count, c2_count);
860 // totalTime performance counter is always created as it is required
861 // by the implementation of java.lang.management.CompilationMBean.
862 {
863 EXCEPTION_MARK;
864 _perf_total_compilation =
865 PerfDataManager::create_counter(JAVA_CI, "totalTime",
866 PerfData::U_Ticks, CHECK);
867 }
868
869
870 if (UsePerfData) {
871
872 EXCEPTION_MARK;
873
874 // create the jvmstat performance counters
875 _perf_osr_compilation =
876 PerfDataManager::create_counter(SUN_CI, "osrTime",
877 PerfData::U_Ticks, CHECK);
878
879 _perf_standard_compilation =
880 PerfDataManager::create_counter(SUN_CI, "standardTime",
881 PerfData::U_Ticks, CHECK);
882
883 _perf_total_bailout_count =
884 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
885 PerfData::U_Events, CHECK);
886
887 _perf_total_invalidated_count =
888 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
889 PerfData::U_Events, CHECK);
890
891 _perf_total_compile_count =
892 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
893 PerfData::U_Events, CHECK);
894 _perf_total_osr_compile_count =
895 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
896 PerfData::U_Events, CHECK);
897
898 _perf_total_standard_compile_count =
899 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
900 PerfData::U_Events, CHECK);
901
902 _perf_sum_osr_bytes_compiled =
903 PerfDataManager::create_counter(SUN_CI, "osrBytes",
904 PerfData::U_Bytes, CHECK);
905
906 _perf_sum_standard_bytes_compiled =
907 PerfDataManager::create_counter(SUN_CI, "standardBytes",
908 PerfData::U_Bytes, CHECK);
909
910 _perf_sum_nmethod_size =
911 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
912 PerfData::U_Bytes, CHECK);
913
914 _perf_sum_nmethod_code_size =
915 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
916 PerfData::U_Bytes, CHECK);
917
918 _perf_last_method =
919 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
920 CompilerCounters::cmname_buffer_length,
921 "", CHECK);
922
923 _perf_last_failed_method =
924 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
925 CompilerCounters::cmname_buffer_length,
926 "", CHECK);
927
928 _perf_last_invalidated_method =
929 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
930 CompilerCounters::cmname_buffer_length,
931 "", CHECK);
932
933 _perf_last_compile_type =
934 PerfDataManager::create_variable(SUN_CI, "lastType",
935 PerfData::U_None,
936 (jlong)CompileBroker::no_compile,
937 CHECK);
938
939 _perf_last_compile_size =
940 PerfDataManager::create_variable(SUN_CI, "lastSize",
941 PerfData::U_Bytes,
942 (jlong)CompileBroker::no_compile,
943 CHECK);
944
945
946 _perf_last_failed_type =
947 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
948 PerfData::U_None,
949 (jlong)CompileBroker::no_compile,
950 CHECK);
951
952 _perf_last_invalidated_type =
953 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
954 PerfData::U_None,
955 (jlong)CompileBroker::no_compile,
956 CHECK);
957 }
958
959 _initialized = true;
960 }
961
962
963 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
964 AbstractCompiler* comp, TRAPS) {
965 CompilerThread* compiler_thread = NULL;
966
967 Klass* k =
968 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
969 true, CHECK_0);
970 instanceKlassHandle klass (THREAD, k);
971 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
972 Handle string = java_lang_String::create_from_str(name, CHECK_0);
973
974 // Initialize thread_oop to put it into the system threadGroup
975 Handle thread_group (THREAD, Universe::system_thread_group());
976 JavaValue result(T_VOID);
977 JavaCalls::call_special(&result, thread_oop,
978 klass,
979 vmSymbols::object_initializer_name(),
980 vmSymbols::threadgroup_string_void_signature(),
981 thread_group,
982 string,
983 CHECK_0);
984
985 {
986 MutexLocker mu(Threads_lock, THREAD);
987 compiler_thread = new CompilerThread(queue, counters);
988 // At this point the new CompilerThread data-races with this startup
989 // thread (which I believe is the primoridal thread and NOT the VM
990 // thread). This means Java bytecodes being executed at startup can
991 // queue compile jobs which will run at whatever default priority the
992 // newly created CompilerThread runs at.
993
994
995 // At this point it may be possible that no osthread was created for the
996 // JavaThread due to lack of memory. We would have to throw an exception
997 // in that case. However, since this must work and we do not allow
998 // exceptions anyway, check and abort if this fails.
999
1000 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1001 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1002 "unable to create new native thread");
1003 }
1004
1005 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1006
1007 // Note that this only sets the JavaThread _priority field, which by
1008 // definition is limited to Java priorities and not OS priorities.
1009 // The os-priority is set in the CompilerThread startup code itself
1010
1011 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1012
1013 // Note that we cannot call os::set_priority because it expects Java
1014 // priorities and we are *explicitly* using OS priorities so that it's
1015 // possible to set the compiler thread priority higher than any Java
1016 // thread.
1017
1018 int native_prio = CompilerThreadPriority;
1019 if (native_prio == -1) {
1020 if (UseCriticalCompilerThreadPriority) {
1021 native_prio = os::java_to_os_priority[CriticalPriority];
1022 } else {
1023 native_prio = os::java_to_os_priority[NearMaxPriority];
1024 }
1025 }
1026 os::set_native_priority(compiler_thread, native_prio);
1027
1028 java_lang_Thread::set_daemon(thread_oop());
1029
1030 compiler_thread->set_threadObj(thread_oop());
1031 compiler_thread->set_compiler(comp);
1032 Threads::add(compiler_thread);
1033 Thread::start(compiler_thread);
1034 }
1035
1036 // Let go of Threads_lock before yielding
1037 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1038
1039 return compiler_thread;
1040 }
1041
1042
1043 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1044 EXCEPTION_MARK;
1045 #if !defined(ZERO) && !defined(SHARK)
1046 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1047 #endif // !ZERO && !SHARK
1048 // Initialize the compilation queue
1049 if (c2_compiler_count > 0) {
1050 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
1051 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1052 }
1053 if (c1_compiler_count > 0) {
1054 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
1055 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1056 }
1057
1058 int compiler_count = c1_compiler_count + c2_compiler_count;
1059
1060 _compiler_threads =
1061 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1062
1063 char name_buffer[256];
1064 for (int i = 0; i < c2_compiler_count; i++) {
1065 // Create a name for our thread.
1066 sprintf(name_buffer, "C2 CompilerThread%d", i);
1067 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1068 // Shark and C2
1069 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK);
1070 _compiler_threads->append(new_thread);
1071 }
1072
1073 for (int i = c2_compiler_count; i < compiler_count; i++) {
1074 // Create a name for our thread.
1075 sprintf(name_buffer, "C1 CompilerThread%d", i);
1076 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1077 // C1
1078 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK);
1079 _compiler_threads->append(new_thread);
1080 }
1081
1082 if (UsePerfData) {
1083 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1084 }
1085 }
1086
1087
1088 // Set the methods on the stack as on_stack so that redefine classes doesn't
1089 // reclaim them
1090 void CompileBroker::mark_on_stack() {
1091 if (_c2_method_queue != NULL) {
1092 _c2_method_queue->mark_on_stack();
1093 }
1094 if (_c1_method_queue != NULL) {
1095 _c1_method_queue->mark_on_stack();
1096 }
1097 }
1098
1099 // ------------------------------------------------------------------
1100 // CompileBroker::compile_method
1101 //
1102 // Request compilation of a method.
1103 void CompileBroker::compile_method_base(methodHandle method,
1104 int osr_bci,
1105 int comp_level,
1106 methodHandle hot_method,
1107 int hot_count,
1108 const char* comment,
1109 Thread* thread) {
1110 // do nothing if compiler thread(s) is not available
1111 if (!_initialized ) {
1112 return;
1113 }
1114
1115 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1116 assert(method->method_holder()->oop_is_instance(),
1117 "sanity check");
1118 assert(!method->method_holder()->is_not_initialized(),
1119 "method holder must be initialized");
1120 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1121
1122 if (CIPrintRequests) {
1123 tty->print("request: ");
1124 method->print_short_name(tty);
1125 if (osr_bci != InvocationEntryBci) {
1126 tty->print(" osr_bci: %d", osr_bci);
1127 }
1128 tty->print(" comment: %s count: %d", comment, hot_count);
1129 if (!hot_method.is_null()) {
1130 tty->print(" hot: ");
1131 if (hot_method() != method()) {
1132 hot_method->print_short_name(tty);
1133 } else {
1134 tty->print("yes");
1135 }
1136 }
1137 tty->cr();
1138 }
1139
1140 // A request has been made for compilation. Before we do any
1141 // real work, check to see if the method has been compiled
1142 // in the meantime with a definitive result.
1143 if (compilation_is_complete(method, osr_bci, comp_level)) {
1144 return;
1145 }
1146
1147 #ifndef PRODUCT
1148 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1149 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1150 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1151 return;
1152 }
1153 }
1154 #endif
1155
1156 // If this method is already in the compile queue, then
1157 // we do not block the current thread.
1158 if (compilation_is_in_queue(method, osr_bci)) {
1159 // We may want to decay our counter a bit here to prevent
1160 // multiple denied requests for compilation. This is an
1161 // open compilation policy issue. Note: The other possibility,
1162 // in the case that this is a blocking compile request, is to have
1163 // all subsequent blocking requesters wait for completion of
1164 // ongoing compiles. Note that in this case we'll need a protocol
1165 // for freeing the associated compile tasks. [Or we could have
1166 // a single static monitor on which all these waiters sleep.]
1167 return;
1168 }
1169
1170 // If the requesting thread is holding the pending list lock
1171 // then we just return. We can't risk blocking while holding
1172 // the pending list lock or a 3-way deadlock may occur
1173 // between the reference handler thread, a GC (instigated
1174 // by a compiler thread), and compiled method registration.
1175 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1176 return;
1177 }
1178
1179 // Outputs from the following MutexLocker block:
1180 CompileTask* task = NULL;
1181 bool blocking = false;
1182 CompileQueue* queue = compile_queue(comp_level);
1183
1184 // Acquire our lock.
1185 {
1186 MutexLocker locker(queue->lock(), thread);
1187
1188 // Make sure the method has not slipped into the queues since
1189 // last we checked; note that those checks were "fast bail-outs".
1190 // Here we need to be more careful, see 14012000 below.
1191 if (compilation_is_in_queue(method, osr_bci)) {
1192 return;
1193 }
1194
1195 // We need to check again to see if the compilation has
1196 // completed. A previous compilation may have registered
1197 // some result.
1198 if (compilation_is_complete(method, osr_bci, comp_level)) {
1199 return;
1200 }
1201
1202 // We now know that this compilation is not pending, complete,
1203 // or prohibited. Assign a compile_id to this compilation
1204 // and check to see if it is in our [Start..Stop) range.
1205 int compile_id = assign_compile_id(method, osr_bci);
1206 if (compile_id == 0) {
1207 // The compilation falls outside the allowed range.
1208 return;
1209 }
1210
1211 // Should this thread wait for completion of the compile?
1212 blocking = is_compile_blocking(method, osr_bci);
1213
1214 // We will enter the compilation in the queue.
1215 // 14012000: Note that this sets the queued_for_compile bits in
1216 // the target method. We can now reason that a method cannot be
1217 // queued for compilation more than once, as follows:
1218 // Before a thread queues a task for compilation, it first acquires
1219 // the compile queue lock, then checks if the method's queued bits
1220 // are set or it has already been compiled. Thus there can not be two
1221 // instances of a compilation task for the same method on the
1222 // compilation queue. Consider now the case where the compilation
1223 // thread has already removed a task for that method from the queue
1224 // and is in the midst of compiling it. In this case, the
1225 // queued_for_compile bits must be set in the method (and these
1226 // will be visible to the current thread, since the bits were set
1227 // under protection of the compile queue lock, which we hold now.
1228 // When the compilation completes, the compiler thread first sets
1229 // the compilation result and then clears the queued_for_compile
1230 // bits. Neither of these actions are protected by a barrier (or done
1231 // under the protection of a lock), so the only guarantee we have
1232 // (on machines with TSO (Total Store Order)) is that these values
1233 // will update in that order. As a result, the only combinations of
1234 // these bits that the current thread will see are, in temporal order:
1235 // <RESULT, QUEUE> :
1236 // <0, 1> : in compile queue, but not yet compiled
1237 // <1, 1> : compiled but queue bit not cleared
1238 // <1, 0> : compiled and queue bit cleared
1239 // Because we first check the queue bits then check the result bits,
1240 // we are assured that we cannot introduce a duplicate task.
1241 // Note that if we did the tests in the reverse order (i.e. check
1242 // result then check queued bit), we could get the result bit before
1243 // the compilation completed, and the queue bit after the compilation
1244 // completed, and end up introducing a "duplicate" (redundant) task.
1245 // In that case, the compiler thread should first check if a method
1246 // has already been compiled before trying to compile it.
1247 // NOTE: in the event that there are multiple compiler threads and
1248 // there is de-optimization/recompilation, things will get hairy,
1249 // and in that case it's best to protect both the testing (here) of
1250 // these bits, and their updating (here and elsewhere) under a
1251 // common lock.
1252 task = create_compile_task(queue,
1253 compile_id, method,
1254 osr_bci, comp_level,
1255 hot_method, hot_count, comment,
1256 blocking);
1257 }
1258
1259 if (blocking) {
1260 wait_for_completion(task);
1261 }
1262 }
1263
1264
1265 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1266 int comp_level,
1267 methodHandle hot_method, int hot_count,
1268 const char* comment, Thread* THREAD) {
1269 // make sure arguments make sense
1270 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1271 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1272 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1273 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1274 // allow any levels for WhiteBox
1275 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1276 // return quickly if possible
1277
1278 // lock, make sure that the compilation
1279 // isn't prohibited in a straightforward way.
1280 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1281 if (comp == NULL || !comp->can_compile_method(method) ||
1282 compilation_is_prohibited(method, osr_bci, comp_level)) {
1283 return NULL;
1284 }
1285
1286 if (osr_bci == InvocationEntryBci) {
1287 // standard compilation
1288 nmethod* method_code = method->code();
1289 if (method_code != NULL) {
1290 if (compilation_is_complete(method, osr_bci, comp_level)) {
1291 return method_code;
1292 }
1293 }
1294 if (method->is_not_compilable(comp_level)) {
1295 return NULL;
1296 }
1297 } else {
1298 // osr compilation
1299 #ifndef TIERED
1300 // seems like an assert of dubious value
1301 assert(comp_level == CompLevel_highest_tier,
1302 "all OSR compiles are assumed to be at a single compilation lavel");
1303 #endif // TIERED
1304 // We accept a higher level osr method
1305 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1306 if (nm != NULL) return nm;
1307 if (method->is_not_osr_compilable(comp_level)) return NULL;
1308 }
1309
1310 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1311 // some prerequisites that are compiler specific
1312 if (comp->is_c2() || comp->is_shark()) {
1313 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1314 // Resolve all classes seen in the signature of the method
1315 // we are compiling.
1316 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1317 }
1318
1319 // If the method is native, do the lookup in the thread requesting
1320 // the compilation. Native lookups can load code, which is not
1321 // permitted during compilation.
1322 //
1323 // Note: A native method implies non-osr compilation which is
1324 // checked with an assertion at the entry of this method.
1325 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1326 bool in_base_library;
1327 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1328 if (HAS_PENDING_EXCEPTION) {
1329 // In case of an exception looking up the method, we just forget
1330 // about it. The interpreter will kick-in and throw the exception.
1331 method->set_not_compilable(); // implies is_not_osr_compilable()
1332 CLEAR_PENDING_EXCEPTION;
1333 return NULL;
1334 }
1335 assert(method->has_native_function(), "must have native code by now");
1336 }
1337
1338 // RedefineClasses() has replaced this method; just return
1339 if (method->is_old()) {
1340 return NULL;
1341 }
1342
1343 // JVMTI -- post_compile_event requires jmethod_id() that may require
1344 // a lock the compiling thread can not acquire. Prefetch it here.
1345 if (JvmtiExport::should_post_compiled_method_load()) {
1346 method->jmethod_id();
1347 }
1348
1349 // do the compilation
1350 if (method->is_native()) {
1351 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1352 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1353 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1354 //
1355 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1356 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1357 AdapterHandlerLibrary::create_native_wrapper(method);
1358 } else {
1359 return NULL;
1360 }
1361 } else {
1362 // If the compiler is shut off due to code cache getting full
1363 // fail out now so blocking compiles dont hang the java thread
1364 if (!should_compile_new_jobs()) {
1365 CompilationPolicy::policy()->delay_compilation(method());
1366 return NULL;
1367 }
1368 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1369 }
1370
1371 // return requested nmethod
1372 // We accept a higher level osr method
1373 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1374 }
1375
1376
1377 // ------------------------------------------------------------------
1378 // CompileBroker::compilation_is_complete
1379 //
1380 // See if compilation of this method is already complete.
1381 bool CompileBroker::compilation_is_complete(methodHandle method,
1382 int osr_bci,
1383 int comp_level) {
1384 bool is_osr = (osr_bci != standard_entry_bci);
1385 if (is_osr) {
1386 if (method->is_not_osr_compilable(comp_level)) {
1387 return true;
1388 } else {
1389 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1390 return (result != NULL);
1391 }
1392 } else {
1393 if (method->is_not_compilable(comp_level)) {
1394 return true;
1395 } else {
1396 nmethod* result = method->code();
1397 if (result == NULL) return false;
1398 return comp_level == result->comp_level();
1399 }
1400 }
1401 }
1402
1403
1404 // ------------------------------------------------------------------
1405 // CompileBroker::compilation_is_in_queue
1406 //
1407 // See if this compilation is already requested.
1408 //
1409 // Implementation note: there is only a single "is in queue" bit
1410 // for each method. This means that the check below is overly
1411 // conservative in the sense that an osr compilation in the queue
1412 // will block a normal compilation from entering the queue (and vice
1413 // versa). This can be remedied by a full queue search to disambiguate
1414 // cases. If it is deemed profitible, this may be done.
1415 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1416 int osr_bci) {
1417 return method->queued_for_compilation();
1418 }
1419
1420 // ------------------------------------------------------------------
1421 // CompileBroker::compilation_is_prohibited
1422 //
1423 // See if this compilation is not allowed.
1424 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1425 bool is_native = method->is_native();
1426 // Some compilers may not support the compilation of natives.
1427 AbstractCompiler *comp = compiler(comp_level);
1428 if (is_native &&
1429 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1430 method->set_not_compilable_quietly(comp_level);
1431 return true;
1432 }
1433
1434 bool is_osr = (osr_bci != standard_entry_bci);
1435 // Some compilers may not support on stack replacement.
1436 if (is_osr &&
1437 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1438 method->set_not_osr_compilable(comp_level);
1439 return true;
1440 }
1441
1442 // The method may be explicitly excluded by the user.
1443 bool quietly;
1444 if (CompilerOracle::should_exclude(method, quietly)) {
1445 if (!quietly) {
1446 // This does not happen quietly...
1447 ResourceMark rm;
1448 tty->print("### Excluding %s:%s",
1449 method->is_native() ? "generation of native wrapper" : "compile",
1450 (method->is_static() ? " static" : ""));
1451 method->print_short_name(tty);
1452 tty->cr();
1453 }
1454 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1455 }
1456
1457 return false;
1458 }
1459
1460 /**
1461 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1462 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1463 * The function also allows to generate separate compilation IDs for OSR compilations.
1464 */
1465 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1466 #ifdef ASSERT
1467 bool is_osr = (osr_bci != standard_entry_bci);
1468 int id;
1469 if (method->is_native()) {
1470 assert(!is_osr, "can't be osr");
1471 // Adapters, native wrappers and method handle intrinsics
1472 // should be generated always.
1473 return Atomic::add(1, &_compilation_id);
1474 } else if (CICountOSR && is_osr) {
1475 id = Atomic::add(1, &_osr_compilation_id);
1476 if (CIStartOSR <= id && id < CIStopOSR) {
1477 return id;
1478 }
1479 } else {
1480 id = Atomic::add(1, &_compilation_id);
1481 if (CIStart <= id && id < CIStop) {
1482 return id;
1483 }
1484 }
1485
1486 // Method was not in the appropriate compilation range.
1487 method->set_not_compilable_quietly();
1488 return 0;
1489 #else
1490 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1491 // only _compilation_id is incremented.
1492 return Atomic::add(1, &_compilation_id);
1493 #endif
1494 }
1495
1496
1497 // ------------------------------------------------------------------
1498 // CompileBroker::is_compile_blocking
1499 //
1500 // Should the current thread be blocked until this compilation request
1501 // has been fulfilled?
1502 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1503 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1504 return !BackgroundCompilation;
1505 }
1506
1507
1508 // ------------------------------------------------------------------
1509 // CompileBroker::preload_classes
1510 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1511 // Move this code over from c1_Compiler.cpp
1512 ShouldNotReachHere();
1513 }
1514
1515
1516 // ------------------------------------------------------------------
1517 // CompileBroker::create_compile_task
1518 //
1519 // Create a CompileTask object representing the current request for
1520 // compilation. Add this task to the queue.
1521 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1522 int compile_id,
1523 methodHandle method,
1524 int osr_bci,
1525 int comp_level,
1526 methodHandle hot_method,
1527 int hot_count,
1528 const char* comment,
1529 bool blocking) {
1530 CompileTask* new_task = allocate_task();
1531 new_task->initialize(compile_id, method, osr_bci, comp_level,
1532 hot_method, hot_count, comment,
1533 blocking);
1534 queue->add(new_task);
1535 return new_task;
1536 }
1537
1538
1539 // ------------------------------------------------------------------
1540 // CompileBroker::allocate_task
1541 //
1542 // Allocate a CompileTask, from the free list if possible.
1543 CompileTask* CompileBroker::allocate_task() {
1544 MutexLocker locker(CompileTaskAlloc_lock);
1545 CompileTask* task = NULL;
1546 if (_task_free_list != NULL) {
1547 task = _task_free_list;
1548 _task_free_list = task->next();
1549 task->set_next(NULL);
1550 } else {
1551 task = new CompileTask();
1552 task->set_next(NULL);
1553 }
1554 return task;
1555 }
1556
1557
1558 // ------------------------------------------------------------------
1559 // CompileBroker::free_task
1560 //
1561 // Add a task to the free list.
1562 void CompileBroker::free_task(CompileTask* task) {
1563 MutexLocker locker(CompileTaskAlloc_lock);
1564 task->free();
1565 task->set_next(_task_free_list);
1566 _task_free_list = task;
1567 }
1568
1569
1570 // ------------------------------------------------------------------
1571 // CompileBroker::wait_for_completion
1572 //
1573 // Wait for the given method CompileTask to complete.
1574 void CompileBroker::wait_for_completion(CompileTask* task) {
1575 if (CIPrintCompileQueue) {
1576 tty->print_cr("BLOCKING FOR COMPILE");
1577 }
1578
1579 assert(task->is_blocking(), "can only wait on blocking task");
1580
1581 JavaThread *thread = JavaThread::current();
1582 thread->set_blocked_on_compilation(true);
1583
1584 methodHandle method(thread, task->method());
1585 {
1586 MutexLocker waiter(task->lock(), thread);
1587
1588 while (!task->is_complete())
1589 task->lock()->wait();
1590 }
1591 // It is harmless to check this status without the lock, because
1592 // completion is a stable property (until the task object is recycled).
1593 assert(task->is_complete(), "Compilation should have completed");
1594 assert(task->code_handle() == NULL, "must be reset");
1595
1596 thread->set_blocked_on_compilation(false);
1597
1598 // By convention, the waiter is responsible for recycling a
1599 // blocking CompileTask. Since there is only one waiter ever
1600 // waiting on a CompileTask, we know that no one else will
1601 // be using this CompileTask; we can free it.
1602 free_task(task);
1603 }
1604
1605 // Initialize compiler thread(s) + compiler object(s). The postcondition
1606 // of this function is that the compiler runtimes are initialized and that
1607 //compiler threads can start compiling.
1608 bool CompileBroker::init_compiler_runtime() {
1609 CompilerThread* thread = CompilerThread::current();
1610 AbstractCompiler* comp = thread->compiler();
1611 // Final sanity check - the compiler object must exist
1612 guarantee(comp != NULL, "Compiler object must exist");
1613
1614 int system_dictionary_modification_counter;
1615 {
1616 MutexLocker locker(Compile_lock, thread);
1617 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1618 }
1619
1620 {
1621 // Must switch to native to allocate ci_env
1622 ThreadToNativeFromVM ttn(thread);
1623 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1624 // Cache Jvmti state
1625 ci_env.cache_jvmti_state();
1626 // Cache DTrace flags
1627 ci_env.cache_dtrace_flags();
1628
1629 // Switch back to VM state to do compiler initialization
1630 ThreadInVMfromNative tv(thread);
1631 ResetNoHandleMark rnhm;
1632
1633
1634 if (!comp->is_shark()) {
1635 // Perform per-thread and global initializations
1636 comp->initialize();
1637 }
1638 }
1639
1640 if (comp->is_failed()) {
1641 disable_compilation_forever();
1642 // If compiler initialization failed, no compiler thread that is specific to a
1643 // particular compiler runtime will ever start to compile methods.
1644
1645 shutdown_compiler_runtime(comp, thread);
1646 return false;
1647 }
1648
1649 // C1 specific check
1650 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1651 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1652 return false;
1653 }
1654
1655 return true;
1656 }
1657
1658 // If C1 and/or C2 initialization failed, we shut down all compilation.
1659 // We do this to keep things simple. This can be changed if it ever turns out to be
1660 // a problem.
1661 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1662 // Free buffer blob, if allocated
1663 if (thread->get_buffer_blob() != NULL) {
1664 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1665 CodeCache::free(thread->get_buffer_blob());
1666 }
1667
1668 if (comp->should_perform_shutdown()) {
1669 // There are two reasons for shutting down the compiler
1670 // 1) compiler runtime initialization failed
1671 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1672 warning("Shutting down compiler %s (no space to run compilers)", comp->name());
1673
1674 // Only one thread per compiler runtime object enters here
1675 // Set state to shut down
1676 comp->set_shut_down();
1677
1678 MutexLocker mu(MethodCompileQueue_lock, thread);
1679 CompileQueue* queue;
1680 if (_c1_method_queue != NULL) {
1681 _c1_method_queue->delete_all();
1682 queue = _c1_method_queue;
1683 _c1_method_queue = NULL;
1684 delete _c1_method_queue;
1685 }
1686
1687 if (_c2_method_queue != NULL) {
1688 _c2_method_queue->delete_all();
1689 queue = _c2_method_queue;
1690 _c2_method_queue = NULL;
1691 delete _c2_method_queue;
1692 }
1693
1694 // We could delete compiler runtimes also. However, there are references to
1695 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1696 // fail. This can be done later if necessary.
1697 }
1698 }
1699
1700 // ------------------------------------------------------------------
1701 // CompileBroker::compiler_thread_loop
1702 //
1703 // The main loop run by a CompilerThread.
1704 void CompileBroker::compiler_thread_loop() {
1705 CompilerThread* thread = CompilerThread::current();
1706 CompileQueue* queue = thread->queue();
1707 // For the thread that initializes the ciObjectFactory
1708 // this resource mark holds all the shared objects
1709 ResourceMark rm;
1710
1711 // First thread to get here will initialize the compiler interface
1712
1713 if (!ciObjectFactory::is_initialized()) {
1714 ASSERT_IN_VM;
1715 MutexLocker only_one (CompileThread_lock, thread);
1716 if (!ciObjectFactory::is_initialized()) {
1717 ciObjectFactory::initialize();
1718 }
1719 }
1720
1721 // Open a log.
1722 if (LogCompilation) {
1723 init_compiler_thread_log();
1724 }
1725 CompileLog* log = thread->log();
1726 if (log != NULL) {
1727 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1728 thread->name(),
1729 os::current_thread_id(),
1730 os::current_process_id());
1731 log->stamp();
1732 log->end_elem();
1733 }
1734
1735 // If compiler thread/runtime initialization fails, exit the compiler thread
1736 if (!init_compiler_runtime()) {
1737 return;
1738 }
1739
1740 // Poll for new compilation tasks as long as the JVM runs. Compilation
1741 // should only be disabled if something went wrong while initializing the
1742 // compiler runtimes. This, in turn, should not happen. The only known case
1743 // when compiler runtime initialization fails is if there is not enough free
1744 // space in the code cache to generate the necessary stubs, etc.
1745 while (!is_compilation_disabled_forever()) {
1746 // We need this HandleMark to avoid leaking VM handles.
1747 HandleMark hm(thread);
1748
1749 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1750 // the code cache is really full
1751 handle_full_code_cache();
1752 }
1753
1754 CompileTask* task = queue->get();
1755 if (task == NULL) {
1756 continue;
1757 }
1758
1759 // Give compiler threads an extra quanta. They tend to be bursty and
1760 // this helps the compiler to finish up the job.
1761 if( CompilerThreadHintNoPreempt )
1762 os::hint_no_preempt();
1763
1764 // trace per thread time and compile statistics
1765 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1766 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1767
1768 // Assign the task to the current thread. Mark this compilation
1769 // thread as active for the profiler.
1770 CompileTaskWrapper ctw(task);
1771 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1772 task->set_code_handle(&result_handle);
1773 methodHandle method(thread, task->method());
1774
1775 // Never compile a method if breakpoints are present in it
1776 if (method()->number_of_breakpoints() == 0) {
1777 // Compile the method.
1778 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1779 #ifdef COMPILER1
1780 // Allow repeating compilations for the purpose of benchmarking
1781 // compile speed. This is not useful for customers.
1782 if (CompilationRepeat != 0) {
1783 int compile_count = CompilationRepeat;
1784 while (compile_count > 0) {
1785 invoke_compiler_on_method(task);
1786 nmethod* nm = method->code();
1787 if (nm != NULL) {
1788 nm->make_zombie();
1789 method->clear_code();
1790 }
1791 compile_count--;
1792 }
1793 }
1794 #endif /* COMPILER1 */
1795 invoke_compiler_on_method(task);
1796 } else {
1797 // After compilation is disabled, remove remaining methods from queue
1798 method->clear_queued_for_compilation();
1799 task->set_failure_reason("compilation is disabled");
1800 }
1801 }
1802 }
1803
1804 // Shut down compiler runtime
1805 shutdown_compiler_runtime(thread->compiler(), thread);
1806 }
1807
1808 // ------------------------------------------------------------------
1809 // CompileBroker::init_compiler_thread_log
1810 //
1811 // Set up state required by +LogCompilation.
1812 void CompileBroker::init_compiler_thread_log() {
1813 CompilerThread* thread = CompilerThread::current();
1814 char file_name[4*K];
1815 FILE* fp = NULL;
1816 intx thread_id = os::current_thread_id();
1817 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1818 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1819 if (dir == NULL) {
1820 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1821 thread_id, os::current_process_id());
1822 } else {
1823 jio_snprintf(file_name, sizeof(file_name),
1824 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1825 os::file_separator(), thread_id, os::current_process_id());
1826 }
1827
1828 fp = fopen(file_name, "at");
1829 if (fp != NULL) {
1830 if (LogCompilation && Verbose) {
1831 tty->print_cr("Opening compilation log %s", file_name);
1832 }
1833 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1834 thread->init_log(log);
1835
1836 if (xtty != NULL) {
1837 ttyLocker ttyl;
1838 // Record any per thread log files
1839 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1840 }
1841 return;
1842 }
1843 }
1844 warning("Cannot open log file: %s", file_name);
1845 }
1846
1847 // ------------------------------------------------------------------
1848 // CompileBroker::set_should_block
1849 //
1850 // Set _should_block.
1851 // Call this from the VM, with Threads_lock held and a safepoint requested.
1852 void CompileBroker::set_should_block() {
1853 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1854 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1855 #ifndef PRODUCT
1856 if (PrintCompilation && (Verbose || WizardMode))
1857 tty->print_cr("notifying compiler thread pool to block");
1858 #endif
1859 _should_block = true;
1860 }
1861
1862 // ------------------------------------------------------------------
1863 // CompileBroker::maybe_block
1864 //
1865 // Call this from the compiler at convenient points, to poll for _should_block.
1866 void CompileBroker::maybe_block() {
1867 if (_should_block) {
1868 #ifndef PRODUCT
1869 if (PrintCompilation && (Verbose || WizardMode))
1870 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1871 #endif
1872 ThreadInVMfromNative tivfn(JavaThread::current());
1873 }
1874 }
1875
1876 // wrapper for CodeCache::print_summary()
1877 static void codecache_print(bool detailed)
1878 {
1879 ResourceMark rm;
1880 stringStream s;
1881 // Dump code cache into a buffer before locking the tty,
1882 {
1883 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1884 CodeCache::print_summary(&s, detailed);
1885 }
1886 ttyLocker ttyl;
1887 tty->print("%s", s.as_string());
1888 }
1889
1890 // ------------------------------------------------------------------
1891 // CompileBroker::invoke_compiler_on_method
1892 //
1893 // Compile a method.
1894 //
1895 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1896 if (PrintCompilation) {
1897 ResourceMark rm;
1898 task->print_line();
1899 }
1900 elapsedTimer time;
1901
1902 CompilerThread* thread = CompilerThread::current();
1903 ResourceMark rm(thread);
1904
1905 if (LogEvents) {
1906 _compilation_log->log_compile(thread, task);
1907 }
1908
1909 // Common flags.
1910 uint compile_id = task->compile_id();
1911 int osr_bci = task->osr_bci();
1912 bool is_osr = (osr_bci != standard_entry_bci);
1913 bool should_log = (thread->log() != NULL);
1914 bool should_break = false;
1915 int task_level = task->comp_level();
1916 {
1917 // create the handle inside it's own block so it can't
1918 // accidentally be referenced once the thread transitions to
1919 // native. The NoHandleMark before the transition should catch
1920 // any cases where this occurs in the future.
1921 methodHandle method(thread, task->method());
1922 should_break = check_break_at(method, compile_id, is_osr);
1923 if (should_log && !CompilerOracle::should_log(method)) {
1924 should_log = false;
1925 }
1926 assert(!method->is_native(), "no longer compile natives");
1927
1928 // Save information about this method in case of failure.
1929 set_last_compile(thread, method, is_osr, task_level);
1930
1931 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1932 }
1933
1934 // Allocate a new set of JNI handles.
1935 push_jni_handle_block();
1936 Method* target_handle = task->method();
1937 int compilable = ciEnv::MethodCompilable;
1938 {
1939 int system_dictionary_modification_counter;
1940 {
1941 MutexLocker locker(Compile_lock, thread);
1942 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1943 }
1944
1945 NoHandleMark nhm;
1946 ThreadToNativeFromVM ttn(thread);
1947
1948 ciEnv ci_env(task, system_dictionary_modification_counter);
1949 if (should_break) {
1950 ci_env.set_break_at_compile(true);
1951 }
1952 if (should_log) {
1953 ci_env.set_log(thread->log());
1954 }
1955 assert(thread->env() == &ci_env, "set by ci_env");
1956 // The thread-env() field is cleared in ~CompileTaskWrapper.
1957
1958 // Cache Jvmti state
1959 ci_env.cache_jvmti_state();
1960
1961 // Cache DTrace flags
1962 ci_env.cache_dtrace_flags();
1963
1964 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1965
1966 TraceTime t1("compilation", &time);
1967 EventCompilation event;
1968
1969 AbstractCompiler *comp = compiler(task_level);
1970 if (comp == NULL) {
1971 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1972 } else {
1973 comp->compile_method(&ci_env, target, osr_bci);
1974 }
1975
1976 if (!ci_env.failing() && task->code() == NULL) {
1977 //assert(false, "compiler should always document failure");
1978 // The compiler elected, without comment, not to register a result.
1979 // Do not attempt further compilations of this method.
1980 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1981 }
1982
1983 // Copy this bit to the enclosing block:
1984 compilable = ci_env.compilable();
1985
1986 if (ci_env.failing()) {
1987 task->set_failure_reason(ci_env.failure_reason());
1988 const char* retry_message = ci_env.retry_message();
1989 if (_compilation_log != NULL) {
1990 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1991 }
1992 if (PrintCompilation) {
1993 FormatBufferResource msg = retry_message != NULL ?
1994 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1995 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
1996 task->print_compilation(tty, msg);
1997 }
1998 } else {
1999 task->mark_success();
2000 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2001 if (_compilation_log != NULL) {
2002 nmethod* code = task->code();
2003 if (code != NULL) {
2004 _compilation_log->log_nmethod(thread, code);
2005 }
2006 }
2007 }
2008 // simulate crash during compilation
2009 assert(task->compile_id() != CICrashAt, "just as planned");
2010 if (event.should_commit()) {
2011 event.set_method(target->get_Method());
2012 event.set_compileID(compile_id);
2013 event.set_compileLevel(task->comp_level());
2014 event.set_succeded(task->is_success());
2015 event.set_isOsr(is_osr);
2016 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2017 event.set_inlinedBytes(task->num_inlined_bytecodes());
2018 event.commit();
2019 }
2020 }
2021 pop_jni_handle_block();
2022
2023 methodHandle method(thread, task->method());
2024
2025 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2026
2027 collect_statistics(thread, time, task);
2028
2029 if (PrintCompilation && PrintCompilation2) {
2030 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2031 tty->print("%4d ", compile_id); // print compilation number
2032 tty->print("%s ", (is_osr ? "%" : " "));
2033 if (task->code() != NULL) {
2034 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2035 }
2036 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2037 }
2038
2039 if (PrintCodeCacheOnCompilation)
2040 codecache_print(/* detailed= */ false);
2041
2042 // Disable compilation, if required.
2043 switch (compilable) {
2044 case ciEnv::MethodCompilable_never:
2045 if (is_osr)
2046 method->set_not_osr_compilable_quietly();
2047 else
2048 method->set_not_compilable_quietly();
2049 break;
2050 case ciEnv::MethodCompilable_not_at_tier:
2051 if (is_osr)
2052 method->set_not_osr_compilable_quietly(task_level);
2053 else
2054 method->set_not_compilable_quietly(task_level);
2055 break;
2056 }
2057
2058 // Note that the queued_for_compilation bits are cleared without
2059 // protection of a mutex. [They were set by the requester thread,
2060 // when adding the task to the compile queue -- at which time the
2061 // compile queue lock was held. Subsequently, we acquired the compile
2062 // queue lock to get this task off the compile queue; thus (to belabour
2063 // the point somewhat) our clearing of the bits must be occurring
2064 // only after the setting of the bits. See also 14012000 above.
2065 method->clear_queued_for_compilation();
2066
2067 #ifdef ASSERT
2068 if (CollectedHeap::fired_fake_oom()) {
2069 // The current compile received a fake OOM during compilation so
2070 // go ahead and exit the VM since the test apparently succeeded
2071 tty->print_cr("*** Shutting down VM after successful fake OOM");
2072 vm_exit(0);
2073 }
2074 #endif
2075 }
2076
2077 /**
2078 * The CodeCache is full. Print out warning and disable compilation
2079 * or try code cache cleaning so compilation can continue later.
2080 */
2081 void CompileBroker::handle_full_code_cache() {
2082 UseInterpreter = true;
2083 if (UseCompiler || AlwaysCompileLoopMethods ) {
2084 if (xtty != NULL) {
2085 ResourceMark rm;
2086 stringStream s;
2087 // Dump code cache state into a buffer before locking the tty,
2088 // because log_state() will use locks causing lock conflicts.
2089 CodeCache::log_state(&s);
2090 // Lock to prevent tearing
2091 ttyLocker ttyl;
2092 xtty->begin_elem("code_cache_full");
2093 xtty->print("%s", s.as_string());
2094 xtty->stamp();
2095 xtty->end_elem();
2096 }
2097
2098 CodeCache::report_codemem_full();
2099
2100 #ifndef PRODUCT
2101 if (CompileTheWorld || ExitOnFullCodeCache) {
2102 codecache_print(/* detailed= */ true);
2103 before_exit(JavaThread::current());
2104 exit_globals(); // will delete tty
2105 vm_direct_exit(CompileTheWorld ? 0 : 1);
2106 }
2107 #endif
2108 if (UseCodeCacheFlushing) {
2109 // Since code cache is full, immediately stop new compiles
2110 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2111 NMethodSweeper::log_sweep("disable_compiler");
2112 }
2113 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2114 // without having to consider the state in which the current thread is.
2115 ThreadInVMfromUnknown in_vm;
2116 NMethodSweeper::possibly_sweep();
2117 } else {
2118 disable_compilation_forever();
2119 }
2120
2121 // Print warning only once
2122 if (should_print_compiler_warning()) {
2123 warning("CodeCache is full. Compiler has been disabled.");
2124 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2125 codecache_print(/* detailed= */ true);
2126 }
2127 }
2128 }
2129
2130 // ------------------------------------------------------------------
2131 // CompileBroker::set_last_compile
2132 //
2133 // Record this compilation for debugging purposes.
2134 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2135 ResourceMark rm;
2136 char* method_name = method->name()->as_C_string();
2137 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2138 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2139 char current_method[CompilerCounters::cmname_buffer_length];
2140 size_t maxLen = CompilerCounters::cmname_buffer_length;
2141
2142 if (UsePerfData) {
2143 const char* class_name = method->method_holder()->name()->as_C_string();
2144
2145 size_t s1len = strlen(class_name);
2146 size_t s2len = strlen(method_name);
2147
2148 // check if we need to truncate the string
2149 if (s1len + s2len + 2 > maxLen) {
2150
2151 // the strategy is to lop off the leading characters of the
2152 // class name and the trailing characters of the method name.
2153
2154 if (s2len + 2 > maxLen) {
2155 // lop of the entire class name string, let snprintf handle
2156 // truncation of the method name.
2157 class_name += s1len; // null string
2158 }
2159 else {
2160 // lop off the extra characters from the front of the class name
2161 class_name += ((s1len + s2len + 2) - maxLen);
2162 }
2163 }
2164
2165 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2166 }
2167
2168 if (CICountOSR && is_osr) {
2169 _last_compile_type = osr_compile;
2170 } else {
2171 _last_compile_type = normal_compile;
2172 }
2173 _last_compile_level = comp_level;
2174
2175 if (UsePerfData) {
2176 CompilerCounters* counters = thread->counters();
2177 counters->set_current_method(current_method);
2178 counters->set_compile_type((jlong)_last_compile_type);
2179 }
2180 }
2181
2182
2183 // ------------------------------------------------------------------
2184 // CompileBroker::push_jni_handle_block
2185 //
2186 // Push on a new block of JNI handles.
2187 void CompileBroker::push_jni_handle_block() {
2188 JavaThread* thread = JavaThread::current();
2189
2190 // Allocate a new block for JNI handles.
2191 // Inlined code from jni_PushLocalFrame()
2192 JNIHandleBlock* java_handles = thread->active_handles();
2193 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2194 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2195 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2196 thread->set_active_handles(compile_handles);
2197 }
2198
2199
2200 // ------------------------------------------------------------------
2201 // CompileBroker::pop_jni_handle_block
2202 //
2203 // Pop off the current block of JNI handles.
2204 void CompileBroker::pop_jni_handle_block() {
2205 JavaThread* thread = JavaThread::current();
2206
2207 // Release our JNI handle block
2208 JNIHandleBlock* compile_handles = thread->active_handles();
2209 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2210 thread->set_active_handles(java_handles);
2211 compile_handles->set_pop_frame_link(NULL);
2212 JNIHandleBlock::release_block(compile_handles, thread); // may block
2213 }
2214
2215
2216 // ------------------------------------------------------------------
2217 // CompileBroker::check_break_at
2218 //
2219 // Should the compilation break at the current compilation.
2220 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2221 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2222 return true;
2223 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2224 return true;
2225 } else {
2226 return (compile_id == CIBreakAt);
2227 }
2228 }
2229
2230 // ------------------------------------------------------------------
2231 // CompileBroker::collect_statistics
2232 //
2233 // Collect statistics about the compilation.
2234
2235 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2236 bool success = task->is_success();
2237 methodHandle method (thread, task->method());
2238 uint compile_id = task->compile_id();
2239 bool is_osr = (task->osr_bci() != standard_entry_bci);
2240 nmethod* code = task->code();
2241 CompilerCounters* counters = thread->counters();
2242
2243 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2244 MutexLocker locker(CompileStatistics_lock);
2245
2246 // _perf variables are production performance counters which are
2247 // updated regardless of the setting of the CITime and CITimeEach flags
2248 //
2249 if (!success) {
2250 _total_bailout_count++;
2251 if (UsePerfData) {
2252 _perf_last_failed_method->set_value(counters->current_method());
2253 _perf_last_failed_type->set_value(counters->compile_type());
2254 _perf_total_bailout_count->inc();
2255 }
2256 } else if (code == NULL) {
2257 if (UsePerfData) {
2258 _perf_last_invalidated_method->set_value(counters->current_method());
2259 _perf_last_invalidated_type->set_value(counters->compile_type());
2260 _perf_total_invalidated_count->inc();
2261 }
2262 _total_invalidated_count++;
2263 } else {
2264 // Compilation succeeded
2265
2266 // update compilation ticks - used by the implementation of
2267 // java.lang.management.CompilationMBean
2268 _perf_total_compilation->inc(time.ticks());
2269
2270 _t_total_compilation.add(time);
2271 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2272
2273 if (CITime) {
2274 if (is_osr) {
2275 _t_osr_compilation.add(time);
2276 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2277 } else {
2278 _t_standard_compilation.add(time);
2279 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2280 }
2281 }
2282
2283 if (UsePerfData) {
2284 // save the name of the last method compiled
2285 _perf_last_method->set_value(counters->current_method());
2286 _perf_last_compile_type->set_value(counters->compile_type());
2287 _perf_last_compile_size->set_value(method->code_size() +
2288 task->num_inlined_bytecodes());
2289 if (is_osr) {
2290 _perf_osr_compilation->inc(time.ticks());
2291 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2292 } else {
2293 _perf_standard_compilation->inc(time.ticks());
2294 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2295 }
2296 }
2297
2298 if (CITimeEach) {
2299 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2300 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2301 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2302 }
2303
2304 // Collect counts of successful compilations
2305 _sum_nmethod_size += code->total_size();
2306 _sum_nmethod_code_size += code->insts_size();
2307 _total_compile_count++;
2308
2309 if (UsePerfData) {
2310 _perf_sum_nmethod_size->inc( code->total_size());
2311 _perf_sum_nmethod_code_size->inc(code->insts_size());
2312 _perf_total_compile_count->inc();
2313 }
2314
2315 if (is_osr) {
2316 if (UsePerfData) _perf_total_osr_compile_count->inc();
2317 _total_osr_compile_count++;
2318 } else {
2319 if (UsePerfData) _perf_total_standard_compile_count->inc();
2320 _total_standard_compile_count++;
2321 }
2322 }
2323 // set the current method for the thread to null
2324 if (UsePerfData) counters->set_current_method("");
2325 }
2326
2327 const char* CompileBroker::compiler_name(int comp_level) {
2328 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2329 if (comp == NULL) {
2330 return "no compiler";
2331 } else {
2332 return (comp->name());
2333 }
2334 }
2335
2336 void CompileBroker::print_times() {
2337 tty->cr();
2338 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2339 tty->print_cr("------------------------------------------------");
2340 //0000000000111111111122222222223333333333444444444455555555556666666666
2341 //0123456789012345678901234567890123456789012345678901234567890123456789
2342 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2343 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2344 CompileBroker::_t_standard_compilation.seconds(),
2345 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2346 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);
2347
2348 AbstractCompiler *comp = compiler(CompLevel_simple);
2349 if (comp != NULL) {
2350 comp->print_timers();
2351 }
2352 comp = compiler(CompLevel_full_optimization);
2353 if (comp != NULL) {
2354 comp->print_timers();
2355 }
2356 tty->cr();
2357 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2358 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2359 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2360 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2361 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2362 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2363 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2364 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2365 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2366 tty->cr();
2367 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2368 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2369 }
2370
2371 // Debugging output for failure
2372 void CompileBroker::print_last_compile() {
2373 if ( _last_compile_level != CompLevel_none &&
2374 compiler(_last_compile_level) != NULL &&
2375 _last_method_compiled != NULL &&
2376 _last_compile_type != no_compile) {
2377 if (_last_compile_type == osr_compile) {
2378 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2379 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2380 } else {
2381 tty->print_cr("Last parse: %d+++(%d) %s",
2382 _compilation_id, _last_compile_level, _last_method_compiled);
2383 }
2384 }
2385 }
2386
2387
2388 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2389 #ifndef PRODUCT
2390 st->print_cr("Compiler thread printing unimplemented.");
2391 st->cr();
2392 #endif
2393 }