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