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 "jfr/jfrEvents.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "oops/methodData.hpp"
36 #include "oops/method.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/nativeLookup.hpp"
39 #include "runtime/arguments.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 "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::_print_compilation_warning = 0;
130 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
131
132 // The installed compiler(s)
133 AbstractCompiler* CompileBroker::_compilers[2];
134
135 // These counters are used to assign an unique ID to each compilation.
136 volatile jint CompileBroker::_compilation_id = 0;
137 volatile jint CompileBroker::_osr_compilation_id = 0;
138
139 // Debugging information
140 int CompileBroker::_last_compile_type = no_compile;
141 int CompileBroker::_last_compile_level = CompLevel_none;
142 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
143
144 // Performance counters
145 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
148
149 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
150 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
154
155 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
156 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
159
160 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
161 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
163 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
165 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
166 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
167
168 // Timers and counters for generating statistics
169 elapsedTimer CompileBroker::_t_total_compilation;
170 elapsedTimer CompileBroker::_t_osr_compilation;
171 elapsedTimer CompileBroker::_t_standard_compilation;
172
173 int CompileBroker::_total_bailout_count = 0;
174 int CompileBroker::_total_invalidated_count = 0;
175 int CompileBroker::_total_compile_count = 0;
176 int CompileBroker::_total_osr_compile_count = 0;
177 int CompileBroker::_total_standard_compile_count = 0;
178
179 int CompileBroker::_sum_osr_bytes_compiled = 0;
180 int CompileBroker::_sum_standard_bytes_compiled = 0;
181 int CompileBroker::_sum_nmethod_size = 0;
182 int CompileBroker::_sum_nmethod_code_size = 0;
183
184 long CompileBroker::_peak_compilation_time = 0;
185
186 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
187 CompileQueue* CompileBroker::_c1_compile_queue = 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 p2i(nm), p2i(nm->code_begin()), p2i(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 CompileTask::free(task);
256 }
257 }
258
259
260 CompileTask* CompileTask::_task_free_list = NULL;
261 #ifdef ASSERT
262 int CompileTask::_num_allocated_tasks = 0;
263 #endif
264 /**
265 * Allocate a CompileTask, from the free list if possible.
266 */
267 CompileTask* CompileTask::allocate() {
268 MutexLocker locker(CompileTaskAlloc_lock);
269 CompileTask* task = NULL;
270
271 if (_task_free_list != NULL) {
272 task = _task_free_list;
273 _task_free_list = task->next();
274 task->set_next(NULL);
275 } else {
276 task = new CompileTask();
277 DEBUG_ONLY(_num_allocated_tasks++;)
278 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
279 task->set_next(NULL);
280 task->set_is_free(true);
281 }
282 assert(task->is_free(), "Task must be free.");
283 task->set_is_free(false);
284 return task;
285 }
286
287
288 /**
289 * Add a task to the free list.
290 */
291 void CompileTask::free(CompileTask* task) {
292 MutexLocker locker(CompileTaskAlloc_lock);
293 if (!task->is_free()) {
294 task->set_code(NULL);
295 assert(!task->lock()->is_locked(), "Should not be locked when freed");
296 JNIHandles::destroy_global(task->_method_holder);
297 JNIHandles::destroy_global(task->_hot_method_holder);
298
299 task->set_is_free(true);
300 task->set_next(_task_free_list);
301 _task_free_list = task;
302 }
303 }
304
305 void CompileTask::initialize(int compile_id,
306 methodHandle method,
307 int osr_bci,
308 int comp_level,
309 methodHandle hot_method,
310 int hot_count,
311 const char* comment,
312 bool is_blocking) {
313 assert(!_lock->is_locked(), "bad locking");
314
315 _compile_id = compile_id;
316 _method = method();
317 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
318 _osr_bci = osr_bci;
319 _is_blocking = is_blocking;
320 _comp_level = comp_level;
321 _num_inlined_bytecodes = 0;
322
323 _is_complete = false;
324 _is_success = false;
325 _code_handle = NULL;
326
327 _hot_method = NULL;
328 _hot_method_holder = NULL;
329 _hot_count = hot_count;
330 _time_queued = 0; // tidy
331 _comment = comment;
332 _failure_reason = NULL;
333
334 if (LogCompilation) {
335 _time_queued = os::elapsed_counter();
336 if (hot_method.not_null()) {
337 if (hot_method == method) {
338 _hot_method = _method;
339 } else {
340 _hot_method = hot_method();
341 // only add loader or mirror if different from _method_holder
342 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
343 }
344 }
345 }
346
347 _next = NULL;
348 }
349
350 // ------------------------------------------------------------------
351 // CompileTask::code/set_code
352 nmethod* CompileTask::code() const {
353 if (_code_handle == NULL) return NULL;
354 return _code_handle->code();
355 }
356 void CompileTask::set_code(nmethod* nm) {
357 if (_code_handle == NULL && nm == NULL) return;
358 guarantee(_code_handle != NULL, "");
359 _code_handle->set_code(nm);
360 if (nm == NULL) _code_handle = NULL; // drop the handle also
361 }
362
363
364 void CompileTask::mark_on_stack() {
365 // Mark these methods as something redefine classes cannot remove.
366 _method->set_on_stack(true);
367 if (_hot_method != NULL) {
368 _hot_method->set_on_stack(true);
369 }
370 }
371
372 // ------------------------------------------------------------------
373 // CompileTask::print
374 void CompileTask::print() {
375 tty->print("<CompileTask compile_id=%d ", _compile_id);
376 tty->print("method=");
377 _method->print_name(tty);
378 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
379 _osr_bci, bool_to_str(_is_blocking),
380 bool_to_str(_is_complete), bool_to_str(_is_success));
381 }
382
383
384 // ------------------------------------------------------------------
385 // CompileTask::print_line_on_error
386 //
387 // This function is called by fatal error handler when the thread
388 // causing troubles is a compiler thread.
389 //
390 // Do not grab any lock, do not allocate memory.
391 //
392 // Otherwise it's the same as CompileTask::print_line()
393 //
394 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
395 // print compiler name
396 st->print("%s:", CompileBroker::compiler_name(comp_level()));
397 print_compilation(st);
398 }
399
400 // ------------------------------------------------------------------
401 // CompileTask::print_line
402 void CompileTask::print_line() {
403 ttyLocker ttyl; // keep the following output all in one block
404 // print compiler name if requested
405 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
406 print_compilation();
407 }
408
409
410 // ------------------------------------------------------------------
411 // CompileTask::print_compilation_impl
412 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
413 bool is_osr_method, int osr_bci, bool is_blocking,
414 const char* msg, bool short_form) {
415 if (!short_form) {
416 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
417 }
418 st->print("%4d ", compile_id); // print compilation number
419
420 // For unloaded methods the transition to zombie occurs after the
421 // method is cleared so it's impossible to report accurate
422 // information for that case.
423 bool is_synchronized = false;
424 bool has_exception_handler = false;
425 bool is_native = false;
426 if (method != NULL) {
427 is_synchronized = method->is_synchronized();
428 has_exception_handler = method->has_exception_handler();
429 is_native = method->is_native();
430 }
431 // method attributes
432 const char compile_type = is_osr_method ? '%' : ' ';
433 const char sync_char = is_synchronized ? 's' : ' ';
434 const char exception_char = has_exception_handler ? '!' : ' ';
435 const char blocking_char = is_blocking ? 'b' : ' ';
436 const char native_char = is_native ? 'n' : ' ';
437
438 // print method attributes
439 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
440
441 if (TieredCompilation) {
442 if (comp_level != -1) st->print("%d ", comp_level);
443 else st->print("- ");
444 }
445 st->print(" "); // more indent
446
447 if (method == NULL) {
448 st->print("(method)");
449 } else {
450 method->print_short_name(st);
451 if (is_osr_method) {
452 st->print(" @ %d", osr_bci);
453 }
454 if (method->is_native())
455 st->print(" (native)");
456 else
457 st->print(" (%d bytes)", method->code_size());
458 }
459
460 if (msg != NULL) {
461 st->print(" %s", msg);
462 }
463 if (!short_form) {
464 st->cr();
465 }
466 }
467
468 // ------------------------------------------------------------------
469 // CompileTask::print_inlining
470 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
471 // 1234567
472 st->print(" "); // print timestamp
473 // 1234
474 st->print(" "); // print compilation number
475
476 // method attributes
477 if (method->is_loaded()) {
478 const char sync_char = method->is_synchronized() ? 's' : ' ';
479 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
480 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
481
482 // print method attributes
483 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
484 } else {
485 // %s!bn
486 st->print(" "); // print method attributes
487 }
488
489 if (TieredCompilation) {
490 st->print(" ");
491 }
492 st->print(" "); // more indent
493 st->print(" "); // initial inlining indent
494
495 for (int i = 0; i < inline_level; i++) st->print(" ");
496
497 st->print("@ %d ", bci); // print bci
498 method->print_short_name(st);
499 if (method->is_loaded())
500 st->print(" (%d bytes)", method->code_size());
501 else
502 st->print(" (not loaded)");
503
504 if (msg != NULL) {
505 st->print(" %s", msg);
506 }
507 st->cr();
508 }
509
510 // ------------------------------------------------------------------
511 // CompileTask::print_inline_indent
512 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
513 // 1234567
514 st->print(" "); // print timestamp
515 // 1234
516 st->print(" "); // print compilation number
517 // %s!bn
518 st->print(" "); // print method attributes
519 if (TieredCompilation) {
520 st->print(" ");
521 }
522 st->print(" "); // more indent
523 st->print(" "); // initial inlining indent
524 for (int i = 0; i < inline_level; i++) st->print(" ");
525 }
526
527 // ------------------------------------------------------------------
528 // CompileTask::print_compilation
529 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
530 bool is_osr_method = osr_bci() != InvocationEntryBci;
531 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
532 }
533
534 // ------------------------------------------------------------------
535 // CompileTask::log_task
536 void CompileTask::log_task(xmlStream* log) {
537 Thread* thread = Thread::current();
538 methodHandle method(thread, this->method());
539 ResourceMark rm(thread);
540
541 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
542 log->print(" compile_id='%d'", _compile_id);
543 if (_osr_bci != CompileBroker::standard_entry_bci) {
544 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
545 } // else compile_kind='c2c'
546 if (!method.is_null()) log->method(method);
547 if (_osr_bci != CompileBroker::standard_entry_bci) {
548 log->print(" osr_bci='%d'", _osr_bci);
549 }
550 if (_comp_level != CompLevel_highest_tier) {
551 log->print(" level='%d'", _comp_level);
552 }
553 if (_is_blocking) {
554 log->print(" blocking='1'");
555 }
556 log->stamp();
557 }
558
559
560 // ------------------------------------------------------------------
561 // CompileTask::log_task_queued
562 void CompileTask::log_task_queued() {
563 Thread* thread = Thread::current();
564 ttyLocker ttyl;
565 ResourceMark rm(thread);
566
567 xtty->begin_elem("task_queued");
568 log_task(xtty);
569 if (_comment != NULL) {
570 xtty->print(" comment='%s'", _comment);
571 }
572 if (_hot_method != NULL) {
573 methodHandle hot(thread, _hot_method);
574 methodHandle method(thread, _method);
575 if (hot() != method()) {
576 xtty->method(hot);
577 }
578 }
579 if (_hot_count != 0) {
580 xtty->print(" hot_count='%d'", _hot_count);
581 }
582 xtty->end_elem();
583 }
584
585
586 // ------------------------------------------------------------------
587 // CompileTask::log_task_start
588 void CompileTask::log_task_start(CompileLog* log) {
589 log->begin_head("task");
590 log_task(log);
591 log->end_head();
592 }
593
594
595 // ------------------------------------------------------------------
596 // CompileTask::log_task_done
597 void CompileTask::log_task_done(CompileLog* log) {
598 Thread* thread = Thread::current();
599 methodHandle method(thread, this->method());
600 ResourceMark rm(thread);
601
602 if (!_is_success) {
603 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
604 log->elem("failure reason='%s'", reason);
605 }
606
607 // <task_done ... stamp='1.234'> </task>
608 nmethod* nm = code();
609 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
610 _is_success, nm == NULL ? 0 : nm->content_size(),
611 method->invocation_count());
612 int bec = method->backedge_count();
613 if (bec != 0) log->print(" backedge_count='%d'", bec);
614 // Note: "_is_complete" is about to be set, but is not.
615 if (_num_inlined_bytecodes != 0) {
616 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
617 }
618 log->stamp();
619 log->end_elem();
620 log->tail("task");
621 log->clear_identities(); // next task will have different CI
622 if (log->unflushed_count() > 2000) {
623 log->flush();
624 }
625 log->mark_file_end();
626 }
627
628
629
630 /**
631 * Add a CompileTask to a CompileQueue
632 */
633 void CompileQueue::add(CompileTask* task) {
634 assert(lock()->owned_by_self(), "must own lock");
635 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
636
637 task->set_next(NULL);
638 task->set_prev(NULL);
639
640 if (_last == NULL) {
641 // The compile queue is empty.
642 assert(_first == NULL, "queue is empty");
643 _first = task;
644 _last = task;
645 } else {
646 // Append the task to the queue.
647 assert(_last->next() == NULL, "not last");
648 _last->set_next(task);
649 task->set_prev(_last);
650 _last = task;
651 }
652 ++_size;
653
654 // Mark the method as being in the compile queue.
655 task->method()->set_queued_for_compilation();
656
657 NOT_PRODUCT(print();)
658
659 if (LogCompilation && xtty != NULL) {
660 task->log_task_queued();
661 }
662
663 // Notify CompilerThreads that a task is available.
664 lock()->notify_all();
665 }
666
667 /**
668 * Empties compilation queue by putting all compilation tasks onto
669 * a freelist. Furthermore, the method wakes up all threads that are
670 * waiting on a compilation task to finish. This can happen if background
671 * compilation is disabled.
672 */
673 void CompileQueue::free_all() {
674 MutexLocker mu(lock());
675 CompileTask* next = _first;
676
677 // Iterate over all tasks in the compile queue
678 while (next != NULL) {
679 CompileTask* current = next;
680 next = current->next();
681 {
682 // Wake up thread that blocks on the compile task.
683 MutexLocker ct_lock(current->lock());
684 current->lock()->notify();
685 }
686 // Put the task back on the freelist.
687 CompileTask::free(current);
688 }
689 _first = NULL;
690
691 // Wake up all threads that block on the queue.
692 lock()->notify_all();
693 }
694
695 // ------------------------------------------------------------------
696 // CompileQueue::get
697 //
698 // Get the next CompileTask from a CompileQueue
699 CompileTask* CompileQueue::get() {
700 NMethodSweeper::possibly_sweep();
701
702 MutexLocker locker(lock());
703 // If _first is NULL we have no more compile jobs. There are two reasons for
704 // having no compile jobs: First, we compiled everything we wanted. Second,
705 // we ran out of code cache so compilation has been disabled. In the latter
706 // case we perform code cache sweeps to free memory such that we can re-enable
707 // compilation.
708 while (_first == NULL) {
709 // Exit loop if compilation is disabled forever
710 if (CompileBroker::is_compilation_disabled_forever()) {
711 return NULL;
712 }
713
714 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
715 // Wait a certain amount of time to possibly do another sweep.
716 // We must wait until stack scanning has happened so that we can
717 // transition a method's state from 'not_entrant' to 'zombie'.
718 long wait_time = NmethodSweepCheckInterval * 1000;
719 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
720 // Only one thread at a time can do sweeping. Scale the
721 // wait time according to the number of compiler threads.
722 // As a result, the next sweep is likely to happen every 100ms
723 // with an arbitrary number of threads that do sweeping.
724 wait_time = 100 * CICompilerCount;
725 }
726 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
727 if (timeout) {
728 MutexUnlocker ul(lock());
729 NMethodSweeper::possibly_sweep();
730 }
731 } else {
732 // If there are no compilation tasks and we can compile new jobs
733 // (i.e., there is enough free space in the code cache) there is
734 // no need to invoke the sweeper. As a result, the hotness of methods
735 // remains unchanged. This behavior is desired, since we want to keep
736 // the stable state, i.e., we do not want to evict methods from the
737 // code cache if it is unnecessary.
738 // We need a timed wait here, since compiler threads can exit if compilation
739 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
740 // is not critical and we do not want idle compiler threads to wake up too often.
741 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
742 }
743 }
744
745 if (CompileBroker::is_compilation_disabled_forever()) {
746 return NULL;
747 }
748
749 CompileTask* task;
750 {
751 No_Safepoint_Verifier nsv;
752 task = CompilationPolicy::policy()->select_task(this);
753 }
754 remove(task);
755 purge_stale_tasks(); // may temporarily release MCQ lock
756 return task;
757 }
758
759 // Clean & deallocate stale compile tasks.
760 // Temporarily releases MethodCompileQueue lock.
761 void CompileQueue::purge_stale_tasks() {
762 assert(lock()->owned_by_self(), "must own lock");
763 if (_first_stale != NULL) {
764 // Stale tasks are purged when MCQ lock is released,
765 // but _first_stale updates are protected by MCQ lock.
766 // Once task processing starts and MCQ lock is released,
767 // other compiler threads can reuse _first_stale.
768 CompileTask* head = _first_stale;
769 _first_stale = NULL;
770 {
771 MutexUnlocker ul(lock());
772 for (CompileTask* task = head; task != NULL; ) {
773 CompileTask* next_task = task->next();
774 CompileTaskWrapper ctw(task); // Frees the task
775 task->set_failure_reason("stale task");
776 task = next_task;
777 }
778 }
779 }
780 }
781
782 void CompileQueue::remove(CompileTask* task) {
783 assert(lock()->owned_by_self(), "must own lock");
784 if (task->prev() != NULL) {
785 task->prev()->set_next(task->next());
786 } else {
787 // max is the first element
788 assert(task == _first, "Sanity");
789 _first = task->next();
790 }
791
792 if (task->next() != NULL) {
793 task->next()->set_prev(task->prev());
794 } else {
795 // max is the last element
796 assert(task == _last, "Sanity");
797 _last = task->prev();
798 }
799 --_size;
800 }
801
802 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
803 assert(lock()->owned_by_self(), "must own lock");
804 remove(task);
805
806 // Enqueue the task for reclamation (should be done outside MCQ lock)
807 task->set_next(_first_stale);
808 task->set_prev(NULL);
809 _first_stale = task;
810 }
811
812 // methods in the compile queue need to be marked as used on the stack
813 // so that they don't get reclaimed by Redefine Classes
814 void CompileQueue::mark_on_stack() {
815 CompileTask* task = _first;
816 while (task != NULL) {
817 task->mark_on_stack();
818 task = task->next();
819 }
820 }
821
822 #ifndef PRODUCT
823 /**
824 * Print entire compilation queue.
825 */
826 void CompileQueue::print() {
827 if (CIPrintCompileQueue) {
828 ttyLocker ttyl;
829 tty->print_cr("Contents of %s", name());
830 tty->print_cr("----------------------");
831 CompileTask* task = _first;
832 while (task != NULL) {
833 task->print_line();
834 task = task->next();
835 }
836 tty->print_cr("----------------------");
837 }
838 }
839 #endif // PRODUCT
840
841 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
842
843 _current_method[0] = '\0';
844 _compile_type = CompileBroker::no_compile;
845
846 if (UsePerfData) {
847 ResourceMark rm;
848
849 // create the thread instance name space string - don't create an
850 // instance subspace if instance is -1 - keeps the adapterThread
851 // counters from having a ".0" namespace.
852 const char* thread_i = (instance == -1) ? thread_name :
853 PerfDataManager::name_space(thread_name, instance);
854
855
856 char* name = PerfDataManager::counter_name(thread_i, "method");
857 _perf_current_method =
858 PerfDataManager::create_string_variable(SUN_CI, name,
859 cmname_buffer_length,
860 _current_method, CHECK);
861
862 name = PerfDataManager::counter_name(thread_i, "type");
863 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
864 PerfData::U_None,
865 (jlong)_compile_type,
866 CHECK);
867
868 name = PerfDataManager::counter_name(thread_i, "time");
869 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
870 PerfData::U_Ticks, CHECK);
871
872 name = PerfDataManager::counter_name(thread_i, "compiles");
873 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
874 PerfData::U_Events, CHECK);
875 }
876 }
877
878 // ------------------------------------------------------------------
879 // CompileBroker::compilation_init
880 //
881 // Initialize the Compilation object
882 void CompileBroker::compilation_init() {
883 _last_method_compiled[0] = '\0';
884
885 // No need to initialize compilation system if we do not use it.
886 if (!UseCompiler) {
887 return;
888 }
889 #ifndef SHARK
890 // Set the interface to the current compiler(s).
891 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
892 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
893 #ifdef COMPILER1
894 if (c1_count > 0) {
895 _compilers[0] = new Compiler();
896 }
897 #endif // COMPILER1
898
899 #ifdef COMPILER2
900 if (c2_count > 0) {
901 _compilers[1] = new C2Compiler();
902 }
903 #endif // COMPILER2
904
905 #else // SHARK
906 int c1_count = 0;
907 int c2_count = 1;
908
909 _compilers[1] = new SharkCompiler();
910 #endif // SHARK
911
912 // Start the CompilerThreads
913 init_compiler_threads(c1_count, c2_count);
914 // totalTime performance counter is always created as it is required
915 // by the implementation of java.lang.management.CompilationMBean.
916 {
917 EXCEPTION_MARK;
918 _perf_total_compilation =
919 PerfDataManager::create_counter(JAVA_CI, "totalTime",
920 PerfData::U_Ticks, CHECK);
921 }
922
923
924 if (UsePerfData) {
925
926 EXCEPTION_MARK;
927
928 // create the jvmstat performance counters
929 _perf_osr_compilation =
930 PerfDataManager::create_counter(SUN_CI, "osrTime",
931 PerfData::U_Ticks, CHECK);
932
933 _perf_standard_compilation =
934 PerfDataManager::create_counter(SUN_CI, "standardTime",
935 PerfData::U_Ticks, CHECK);
936
937 _perf_total_bailout_count =
938 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
939 PerfData::U_Events, CHECK);
940
941 _perf_total_invalidated_count =
942 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
943 PerfData::U_Events, CHECK);
944
945 _perf_total_compile_count =
946 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
947 PerfData::U_Events, CHECK);
948 _perf_total_osr_compile_count =
949 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
950 PerfData::U_Events, CHECK);
951
952 _perf_total_standard_compile_count =
953 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
954 PerfData::U_Events, CHECK);
955
956 _perf_sum_osr_bytes_compiled =
957 PerfDataManager::create_counter(SUN_CI, "osrBytes",
958 PerfData::U_Bytes, CHECK);
959
960 _perf_sum_standard_bytes_compiled =
961 PerfDataManager::create_counter(SUN_CI, "standardBytes",
962 PerfData::U_Bytes, CHECK);
963
964 _perf_sum_nmethod_size =
965 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
966 PerfData::U_Bytes, CHECK);
967
968 _perf_sum_nmethod_code_size =
969 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
970 PerfData::U_Bytes, CHECK);
971
972 _perf_last_method =
973 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
974 CompilerCounters::cmname_buffer_length,
975 "", CHECK);
976
977 _perf_last_failed_method =
978 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
979 CompilerCounters::cmname_buffer_length,
980 "", CHECK);
981
982 _perf_last_invalidated_method =
983 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
984 CompilerCounters::cmname_buffer_length,
985 "", CHECK);
986
987 _perf_last_compile_type =
988 PerfDataManager::create_variable(SUN_CI, "lastType",
989 PerfData::U_None,
990 (jlong)CompileBroker::no_compile,
991 CHECK);
992
993 _perf_last_compile_size =
994 PerfDataManager::create_variable(SUN_CI, "lastSize",
995 PerfData::U_Bytes,
996 (jlong)CompileBroker::no_compile,
997 CHECK);
998
999
1000 _perf_last_failed_type =
1001 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
1002 PerfData::U_None,
1003 (jlong)CompileBroker::no_compile,
1004 CHECK);
1005
1006 _perf_last_invalidated_type =
1007 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1008 PerfData::U_None,
1009 (jlong)CompileBroker::no_compile,
1010 CHECK);
1011 }
1012
1013 _initialized = true;
1014 }
1015
1016
1017 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1018 AbstractCompiler* comp, TRAPS) {
1019 CompilerThread* compiler_thread = NULL;
1020
1021 Klass* k =
1022 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1023 true, CHECK_0);
1024 instanceKlassHandle klass (THREAD, k);
1025 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1026 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1027
1028 // Initialize thread_oop to put it into the system threadGroup
1029 Handle thread_group (THREAD, Universe::system_thread_group());
1030 JavaValue result(T_VOID);
1031 JavaCalls::call_special(&result, thread_oop,
1032 klass,
1033 vmSymbols::object_initializer_name(),
1034 vmSymbols::threadgroup_string_void_signature(),
1035 thread_group,
1036 string,
1037 CHECK_0);
1038
1039 {
1040 MutexLocker mu(Threads_lock, THREAD);
1041 compiler_thread = new CompilerThread(queue, counters);
1042 // At this point the new CompilerThread data-races with this startup
1043 // thread (which I believe is the primoridal thread and NOT the VM
1044 // thread). This means Java bytecodes being executed at startup can
1045 // queue compile jobs which will run at whatever default priority the
1046 // newly created CompilerThread runs at.
1047
1048
1049 // At this point it may be possible that no osthread was created for the
1050 // JavaThread due to lack of memory. We would have to throw an exception
1051 // in that case. However, since this must work and we do not allow
1052 // exceptions anyway, check and abort if this fails.
1053
1054 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1055 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1056 "unable to create new native thread");
1057 }
1058
1059 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1060
1061 // Note that this only sets the JavaThread _priority field, which by
1062 // definition is limited to Java priorities and not OS priorities.
1063 // The os-priority is set in the CompilerThread startup code itself
1064
1065 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1066
1067 // Note that we cannot call os::set_priority because it expects Java
1068 // priorities and we are *explicitly* using OS priorities so that it's
1069 // possible to set the compiler thread priority higher than any Java
1070 // thread.
1071
1072 int native_prio = CompilerThreadPriority;
1073 if (native_prio == -1) {
1074 if (UseCriticalCompilerThreadPriority) {
1075 native_prio = os::java_to_os_priority[CriticalPriority];
1076 } else {
1077 native_prio = os::java_to_os_priority[NearMaxPriority];
1078 }
1079 }
1080 os::set_native_priority(compiler_thread, native_prio);
1081
1082 java_lang_Thread::set_daemon(thread_oop());
1083
1084 compiler_thread->set_threadObj(thread_oop());
1085 compiler_thread->set_compiler(comp);
1086 Threads::add(compiler_thread);
1087 Thread::start(compiler_thread);
1088 }
1089
1090 // Let go of Threads_lock before yielding
1091 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1092
1093 return compiler_thread;
1094 }
1095
1096
1097 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1098 EXCEPTION_MARK;
1099 #if !defined(ZERO) && !defined(SHARK)
1100 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1101 #endif // !ZERO && !SHARK
1102 // Initialize the compilation queue
1103 if (c2_compiler_count > 0) {
1104 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1105 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1106 }
1107 if (c1_compiler_count > 0) {
1108 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1109 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1110 }
1111
1112 int compiler_count = c1_compiler_count + c2_compiler_count;
1113
1114 _compiler_threads =
1115 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1116
1117 char name_buffer[256];
1118 for (int i = 0; i < c2_compiler_count; i++) {
1119 // Create a name for our thread.
1120 sprintf(name_buffer, "C2 CompilerThread%d", i);
1121 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1122 // Shark and C2
1123 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1124 _compiler_threads->append(new_thread);
1125 }
1126
1127 for (int i = c2_compiler_count; i < compiler_count; i++) {
1128 // Create a name for our thread.
1129 sprintf(name_buffer, "C1 CompilerThread%d", i);
1130 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1131 // C1
1132 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1133 _compiler_threads->append(new_thread);
1134 }
1135
1136 if (UsePerfData) {
1137 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1138 }
1139 }
1140
1141
1142 /**
1143 * Set the methods on the stack as on_stack so that redefine classes doesn't
1144 * reclaim them. This method is executed at a safepoint.
1145 */
1146 void CompileBroker::mark_on_stack() {
1147 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1148 // Since we are at a safepoint, we do not need a lock to access
1149 // the compile queues.
1150 if (_c2_compile_queue != NULL) {
1151 _c2_compile_queue->mark_on_stack();
1152 }
1153 if (_c1_compile_queue != NULL) {
1154 _c1_compile_queue->mark_on_stack();
1155 }
1156 }
1157
1158 // ------------------------------------------------------------------
1159 // CompileBroker::compile_method
1160 //
1161 // Request compilation of a method.
1162 void CompileBroker::compile_method_base(methodHandle method,
1163 int osr_bci,
1164 int comp_level,
1165 methodHandle hot_method,
1166 int hot_count,
1167 const char* comment,
1168 Thread* thread) {
1169 // do nothing if compiler thread(s) is not available
1170 if (!_initialized) {
1171 return;
1172 }
1173
1174 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1175 assert(method->method_holder()->oop_is_instance(),
1176 "sanity check");
1177 assert(!method->method_holder()->is_not_initialized(),
1178 "method holder must be initialized");
1179 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1180
1181 if (CIPrintRequests) {
1182 tty->print("request: ");
1183 method->print_short_name(tty);
1184 if (osr_bci != InvocationEntryBci) {
1185 tty->print(" osr_bci: %d", osr_bci);
1186 }
1187 tty->print(" comment: %s count: %d", comment, hot_count);
1188 if (!hot_method.is_null()) {
1189 tty->print(" hot: ");
1190 if (hot_method() != method()) {
1191 hot_method->print_short_name(tty);
1192 } else {
1193 tty->print("yes");
1194 }
1195 }
1196 tty->cr();
1197 }
1198
1199 // A request has been made for compilation. Before we do any
1200 // real work, check to see if the method has been compiled
1201 // in the meantime with a definitive result.
1202 if (compilation_is_complete(method, osr_bci, comp_level)) {
1203 return;
1204 }
1205
1206 #ifndef PRODUCT
1207 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1208 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1209 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1210 return;
1211 }
1212 }
1213 #endif
1214
1215 // If this method is already in the compile queue, then
1216 // we do not block the current thread.
1217 if (compilation_is_in_queue(method)) {
1218 // We may want to decay our counter a bit here to prevent
1219 // multiple denied requests for compilation. This is an
1220 // open compilation policy issue. Note: The other possibility,
1221 // in the case that this is a blocking compile request, is to have
1222 // all subsequent blocking requesters wait for completion of
1223 // ongoing compiles. Note that in this case we'll need a protocol
1224 // for freeing the associated compile tasks. [Or we could have
1225 // a single static monitor on which all these waiters sleep.]
1226 return;
1227 }
1228
1229 // If the requesting thread is holding the pending list lock
1230 // then we just return. We can't risk blocking while holding
1231 // the pending list lock or a 3-way deadlock may occur
1232 // between the reference handler thread, a GC (instigated
1233 // by a compiler thread), and compiled method registration.
1234 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1235 return;
1236 }
1237
1238 if (TieredCompilation) {
1239 // Tiered policy requires MethodCounters to exist before adding a method to
1240 // the queue. Create if we don't have them yet.
1241 method->get_method_counters(thread);
1242 }
1243
1244 // Outputs from the following MutexLocker block:
1245 CompileTask* task = NULL;
1246 bool blocking = false;
1247 CompileQueue* queue = compile_queue(comp_level);
1248
1249 // Acquire our lock.
1250 {
1251 MutexLocker locker(queue->lock(), thread);
1252
1253 // Make sure the method has not slipped into the queues since
1254 // last we checked; note that those checks were "fast bail-outs".
1255 // Here we need to be more careful, see 14012000 below.
1256 if (compilation_is_in_queue(method)) {
1257 return;
1258 }
1259
1260 // We need to check again to see if the compilation has
1261 // completed. A previous compilation may have registered
1262 // some result.
1263 if (compilation_is_complete(method, osr_bci, comp_level)) {
1264 return;
1265 }
1266
1267 // We now know that this compilation is not pending, complete,
1268 // or prohibited. Assign a compile_id to this compilation
1269 // and check to see if it is in our [Start..Stop) range.
1270 int compile_id = assign_compile_id(method, osr_bci);
1271 if (compile_id == 0) {
1272 // The compilation falls outside the allowed range.
1273 return;
1274 }
1275
1276 // Should this thread wait for completion of the compile?
1277 blocking = is_compile_blocking();
1278
1279 // We will enter the compilation in the queue.
1280 // 14012000: Note that this sets the queued_for_compile bits in
1281 // the target method. We can now reason that a method cannot be
1282 // queued for compilation more than once, as follows:
1283 // Before a thread queues a task for compilation, it first acquires
1284 // the compile queue lock, then checks if the method's queued bits
1285 // are set or it has already been compiled. Thus there can not be two
1286 // instances of a compilation task for the same method on the
1287 // compilation queue. Consider now the case where the compilation
1288 // thread has already removed a task for that method from the queue
1289 // and is in the midst of compiling it. In this case, the
1290 // queued_for_compile bits must be set in the method (and these
1291 // will be visible to the current thread, since the bits were set
1292 // under protection of the compile queue lock, which we hold now.
1293 // When the compilation completes, the compiler thread first sets
1294 // the compilation result and then clears the queued_for_compile
1295 // bits. Neither of these actions are protected by a barrier (or done
1296 // under the protection of a lock), so the only guarantee we have
1297 // (on machines with TSO (Total Store Order)) is that these values
1298 // will update in that order. As a result, the only combinations of
1299 // these bits that the current thread will see are, in temporal order:
1300 // <RESULT, QUEUE> :
1301 // <0, 1> : in compile queue, but not yet compiled
1302 // <1, 1> : compiled but queue bit not cleared
1303 // <1, 0> : compiled and queue bit cleared
1304 // Because we first check the queue bits then check the result bits,
1305 // we are assured that we cannot introduce a duplicate task.
1306 // Note that if we did the tests in the reverse order (i.e. check
1307 // result then check queued bit), we could get the result bit before
1308 // the compilation completed, and the queue bit after the compilation
1309 // completed, and end up introducing a "duplicate" (redundant) task.
1310 // In that case, the compiler thread should first check if a method
1311 // has already been compiled before trying to compile it.
1312 // NOTE: in the event that there are multiple compiler threads and
1313 // there is de-optimization/recompilation, things will get hairy,
1314 // and in that case it's best to protect both the testing (here) of
1315 // these bits, and their updating (here and elsewhere) under a
1316 // common lock.
1317 task = create_compile_task(queue,
1318 compile_id, method,
1319 osr_bci, comp_level,
1320 hot_method, hot_count, comment,
1321 blocking);
1322 }
1323
1324 if (blocking) {
1325 wait_for_completion(task);
1326 }
1327 }
1328
1329
1330 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1331 int comp_level,
1332 methodHandle hot_method, int hot_count,
1333 const char* comment, Thread* THREAD) {
1334 // make sure arguments make sense
1335 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1336 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1337 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1338 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1339 // allow any levels for WhiteBox
1340 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1341 // return quickly if possible
1342
1343 // lock, make sure that the compilation
1344 // isn't prohibited in a straightforward way.
1345 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1346 if (comp == NULL || !comp->can_compile_method(method) ||
1347 compilation_is_prohibited(method, osr_bci, comp_level)) {
1348 return NULL;
1349 }
1350
1351 if (osr_bci == InvocationEntryBci) {
1352 // standard compilation
1353 nmethod* method_code = method->code();
1354 if (method_code != NULL) {
1355 if (compilation_is_complete(method, osr_bci, comp_level)) {
1356 return method_code;
1357 }
1358 }
1359 if (method->is_not_compilable(comp_level)) {
1360 return NULL;
1361 }
1362 } else {
1363 // osr compilation
1364 #ifndef TIERED
1365 // seems like an assert of dubious value
1366 assert(comp_level == CompLevel_highest_tier,
1367 "all OSR compiles are assumed to be at a single compilation lavel");
1368 #endif // TIERED
1369 // We accept a higher level osr method
1370 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1371 if (nm != NULL) return nm;
1372 if (method->is_not_osr_compilable(comp_level)) return NULL;
1373 }
1374
1375 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1376 // some prerequisites that are compiler specific
1377 if (comp->is_c2() || comp->is_shark()) {
1378 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1379 // Resolve all classes seen in the signature of the method
1380 // we are compiling.
1381 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1382 }
1383
1384 // If the method is native, do the lookup in the thread requesting
1385 // the compilation. Native lookups can load code, which is not
1386 // permitted during compilation.
1387 //
1388 // Note: A native method implies non-osr compilation which is
1389 // checked with an assertion at the entry of this method.
1390 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1391 bool in_base_library;
1392 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1393 if (HAS_PENDING_EXCEPTION) {
1394 // In case of an exception looking up the method, we just forget
1395 // about it. The interpreter will kick-in and throw the exception.
1396 method->set_not_compilable(); // implies is_not_osr_compilable()
1397 CLEAR_PENDING_EXCEPTION;
1398 return NULL;
1399 }
1400 assert(method->has_native_function(), "must have native code by now");
1401 }
1402
1403 // RedefineClasses() has replaced this method; just return
1404 if (method->is_old()) {
1405 return NULL;
1406 }
1407
1408 // JVMTI -- post_compile_event requires jmethod_id() that may require
1409 // a lock the compiling thread can not acquire. Prefetch it here.
1410 if (JvmtiExport::should_post_compiled_method_load()) {
1411 method->jmethod_id();
1412 }
1413
1414 // do the compilation
1415 if (method->is_native()) {
1416 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1417 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1418 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1419 //
1420 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1421 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1422 AdapterHandlerLibrary::create_native_wrapper(method);
1423 } else {
1424 return NULL;
1425 }
1426 } else {
1427 // If the compiler is shut off due to code cache getting full
1428 // fail out now so blocking compiles dont hang the java thread
1429 if (!should_compile_new_jobs()) {
1430 CompilationPolicy::policy()->delay_compilation(method());
1431 return NULL;
1432 }
1433 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1434 }
1435
1436 // return requested nmethod
1437 // We accept a higher level osr method
1438 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1439 }
1440
1441
1442 // ------------------------------------------------------------------
1443 // CompileBroker::compilation_is_complete
1444 //
1445 // See if compilation of this method is already complete.
1446 bool CompileBroker::compilation_is_complete(methodHandle method,
1447 int osr_bci,
1448 int comp_level) {
1449 bool is_osr = (osr_bci != standard_entry_bci);
1450 if (is_osr) {
1451 if (method->is_not_osr_compilable(comp_level)) {
1452 return true;
1453 } else {
1454 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1455 return (result != NULL);
1456 }
1457 } else {
1458 if (method->is_not_compilable(comp_level)) {
1459 return true;
1460 } else {
1461 nmethod* result = method->code();
1462 if (result == NULL) return false;
1463 return comp_level == result->comp_level();
1464 }
1465 }
1466 }
1467
1468
1469 /**
1470 * See if this compilation is already requested.
1471 *
1472 * Implementation note: there is only a single "is in queue" bit
1473 * for each method. This means that the check below is overly
1474 * conservative in the sense that an osr compilation in the queue
1475 * will block a normal compilation from entering the queue (and vice
1476 * versa). This can be remedied by a full queue search to disambiguate
1477 * cases. If it is deemed profitable, this may be done.
1478 */
1479 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1480 return method->queued_for_compilation();
1481 }
1482
1483 // ------------------------------------------------------------------
1484 // CompileBroker::compilation_is_prohibited
1485 //
1486 // See if this compilation is not allowed.
1487 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1488 bool is_native = method->is_native();
1489 // Some compilers may not support the compilation of natives.
1490 AbstractCompiler *comp = compiler(comp_level);
1491 if (is_native &&
1492 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1493 method->set_not_compilable_quietly(comp_level);
1494 return true;
1495 }
1496
1497 bool is_osr = (osr_bci != standard_entry_bci);
1498 // Some compilers may not support on stack replacement.
1499 if (is_osr &&
1500 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1501 method->set_not_osr_compilable(comp_level);
1502 return true;
1503 }
1504
1505 // The method may be explicitly excluded by the user.
1506 bool quietly;
1507 if (CompilerOracle::should_exclude(method, quietly)) {
1508 if (!quietly) {
1509 // This does not happen quietly...
1510 ResourceMark rm;
1511 tty->print("### Excluding %s:%s",
1512 method->is_native() ? "generation of native wrapper" : "compile",
1513 (method->is_static() ? " static" : ""));
1514 method->print_short_name(tty);
1515 tty->cr();
1516 }
1517 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1518 }
1519
1520 return false;
1521 }
1522
1523 /**
1524 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1525 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1526 * The function also allows to generate separate compilation IDs for OSR compilations.
1527 */
1528 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1529 #ifdef ASSERT
1530 bool is_osr = (osr_bci != standard_entry_bci);
1531 int id;
1532 if (method->is_native()) {
1533 assert(!is_osr, "can't be osr");
1534 // Adapters, native wrappers and method handle intrinsics
1535 // should be generated always.
1536 return Atomic::add(1, &_compilation_id);
1537 } else if (CICountOSR && is_osr) {
1538 id = Atomic::add(1, &_osr_compilation_id);
1539 if (CIStartOSR <= id && id < CIStopOSR) {
1540 return id;
1541 }
1542 } else {
1543 id = Atomic::add(1, &_compilation_id);
1544 if (CIStart <= id && id < CIStop) {
1545 return id;
1546 }
1547 }
1548
1549 // Method was not in the appropriate compilation range.
1550 method->set_not_compilable_quietly();
1551 return 0;
1552 #else
1553 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1554 // only _compilation_id is incremented.
1555 return Atomic::add(1, &_compilation_id);
1556 #endif
1557 }
1558
1559 /**
1560 * Should the current thread block until this compilation request
1561 * has been fulfilled?
1562 */
1563 bool CompileBroker::is_compile_blocking() {
1564 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1565 return !BackgroundCompilation;
1566 }
1567
1568
1569 // ------------------------------------------------------------------
1570 // CompileBroker::preload_classes
1571 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1572 // Move this code over from c1_Compiler.cpp
1573 ShouldNotReachHere();
1574 }
1575
1576
1577 // ------------------------------------------------------------------
1578 // CompileBroker::create_compile_task
1579 //
1580 // Create a CompileTask object representing the current request for
1581 // compilation. Add this task to the queue.
1582 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1583 int compile_id,
1584 methodHandle method,
1585 int osr_bci,
1586 int comp_level,
1587 methodHandle hot_method,
1588 int hot_count,
1589 const char* comment,
1590 bool blocking) {
1591 CompileTask* new_task = CompileTask::allocate();
1592 new_task->initialize(compile_id, method, osr_bci, comp_level,
1593 hot_method, hot_count, comment,
1594 blocking);
1595 queue->add(new_task);
1596 return new_task;
1597 }
1598
1599
1600 /**
1601 * Wait for the compilation task to complete.
1602 */
1603 void CompileBroker::wait_for_completion(CompileTask* task) {
1604 if (CIPrintCompileQueue) {
1605 ttyLocker ttyl;
1606 tty->print_cr("BLOCKING FOR COMPILE");
1607 }
1608
1609 assert(task->is_blocking(), "can only wait on blocking task");
1610
1611 JavaThread* thread = JavaThread::current();
1612 thread->set_blocked_on_compilation(true);
1613
1614 methodHandle method(thread, task->method());
1615 {
1616 MutexLocker waiter(task->lock(), thread);
1617
1618 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1619 task->lock()->wait();
1620 }
1621 }
1622
1623 thread->set_blocked_on_compilation(false);
1624 if (is_compilation_disabled_forever()) {
1625 CompileTask::free(task);
1626 return;
1627 }
1628
1629 // It is harmless to check this status without the lock, because
1630 // completion is a stable property (until the task object is recycled).
1631 assert(task->is_complete(), "Compilation should have completed");
1632 assert(task->code_handle() == NULL, "must be reset");
1633
1634 // By convention, the waiter is responsible for recycling a
1635 // blocking CompileTask. Since there is only one waiter ever
1636 // waiting on a CompileTask, we know that no one else will
1637 // be using this CompileTask; we can free it.
1638 CompileTask::free(task);
1639 }
1640
1641 /**
1642 * Initialize compiler thread(s) + compiler object(s). The postcondition
1643 * of this function is that the compiler runtimes are initialized and that
1644 * compiler threads can start compiling.
1645 */
1646 bool CompileBroker::init_compiler_runtime() {
1647 CompilerThread* thread = CompilerThread::current();
1648 AbstractCompiler* comp = thread->compiler();
1649 // Final sanity check - the compiler object must exist
1650 guarantee(comp != NULL, "Compiler object must exist");
1651
1652 int system_dictionary_modification_counter;
1653 {
1654 MutexLocker locker(Compile_lock, thread);
1655 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1656 }
1657
1658 {
1659 // Must switch to native to allocate ci_env
1660 ThreadToNativeFromVM ttn(thread);
1661 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1662 // Cache Jvmti state
1663 ci_env.cache_jvmti_state();
1664 // Cache DTrace flags
1665 ci_env.cache_dtrace_flags();
1666
1667 // Switch back to VM state to do compiler initialization
1668 ThreadInVMfromNative tv(thread);
1669 ResetNoHandleMark rnhm;
1670
1671
1672 if (!comp->is_shark()) {
1673 // Perform per-thread and global initializations
1674 comp->initialize();
1675 }
1676 }
1677
1678 if (comp->is_failed()) {
1679 disable_compilation_forever();
1680 // If compiler initialization failed, no compiler thread that is specific to a
1681 // particular compiler runtime will ever start to compile methods.
1682 shutdown_compiler_runtime(comp, thread);
1683 return false;
1684 }
1685
1686 // C1 specific check
1687 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1688 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1689 return false;
1690 }
1691
1692 return true;
1693 }
1694
1695 /**
1696 * If C1 and/or C2 initialization failed, we shut down all compilation.
1697 * We do this to keep things simple. This can be changed if it ever turns
1698 * out to be a problem.
1699 */
1700 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1701 // Free buffer blob, if allocated
1702 if (thread->get_buffer_blob() != NULL) {
1703 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1704 CodeCache::free(thread->get_buffer_blob());
1705 }
1706
1707 if (comp->should_perform_shutdown()) {
1708 // There are two reasons for shutting down the compiler
1709 // 1) compiler runtime initialization failed
1710 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1711 warning("%s initialization failed. Shutting down all compilers", comp->name());
1712
1713 // Only one thread per compiler runtime object enters here
1714 // Set state to shut down
1715 comp->set_shut_down();
1716
1717 // Delete all queued compilation tasks to make compiler threads exit faster.
1718 if (_c1_compile_queue != NULL) {
1719 _c1_compile_queue->free_all();
1720 }
1721
1722 if (_c2_compile_queue != NULL) {
1723 _c2_compile_queue->free_all();
1724 }
1725
1726 // Set flags so that we continue execution with using interpreter only.
1727 UseCompiler = false;
1728 UseInterpreter = true;
1729
1730 // We could delete compiler runtimes also. However, there are references to
1731 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1732 // fail. This can be done later if necessary.
1733 }
1734 }
1735
1736 // ------------------------------------------------------------------
1737 // CompileBroker::compiler_thread_loop
1738 //
1739 // The main loop run by a CompilerThread.
1740 void CompileBroker::compiler_thread_loop() {
1741 CompilerThread* thread = CompilerThread::current();
1742 CompileQueue* queue = thread->queue();
1743 // For the thread that initializes the ciObjectFactory
1744 // this resource mark holds all the shared objects
1745 ResourceMark rm;
1746
1747 // First thread to get here will initialize the compiler interface
1748
1749 if (!ciObjectFactory::is_initialized()) {
1750 ASSERT_IN_VM;
1751 MutexLocker only_one (CompileThread_lock, thread);
1752 if (!ciObjectFactory::is_initialized()) {
1753 ciObjectFactory::initialize();
1754 }
1755 }
1756
1757 // Open a log.
1758 if (LogCompilation) {
1759 init_compiler_thread_log();
1760 }
1761 CompileLog* log = thread->log();
1762 if (log != NULL) {
1763 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1764 thread->name(),
1765 os::current_thread_id(),
1766 os::current_process_id());
1767 log->stamp();
1768 log->end_elem();
1769 }
1770
1771 // If compiler thread/runtime initialization fails, exit the compiler thread
1772 if (!init_compiler_runtime()) {
1773 return;
1774 }
1775
1776 // Poll for new compilation tasks as long as the JVM runs. Compilation
1777 // should only be disabled if something went wrong while initializing the
1778 // compiler runtimes. This, in turn, should not happen. The only known case
1779 // when compiler runtime initialization fails is if there is not enough free
1780 // space in the code cache to generate the necessary stubs, etc.
1781 while (!is_compilation_disabled_forever()) {
1782 // We need this HandleMark to avoid leaking VM handles.
1783 HandleMark hm(thread);
1784
1785 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1786 // the code cache is really full
1787 handle_full_code_cache();
1788 }
1789
1790 CompileTask* task = queue->get();
1791 if (task == NULL) {
1792 continue;
1793 }
1794
1795 // Give compiler threads an extra quanta. They tend to be bursty and
1796 // this helps the compiler to finish up the job.
1797 if( CompilerThreadHintNoPreempt )
1798 os::hint_no_preempt();
1799
1800 // trace per thread time and compile statistics
1801 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1802 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1803
1804 // Assign the task to the current thread. Mark this compilation
1805 // thread as active for the profiler.
1806 CompileTaskWrapper ctw(task);
1807 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1808 task->set_code_handle(&result_handle);
1809 methodHandle method(thread, task->method());
1810
1811 // Never compile a method if breakpoints are present in it
1812 if (method()->number_of_breakpoints() == 0) {
1813 // Compile the method.
1814 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1815 invoke_compiler_on_method(task);
1816 } else {
1817 // After compilation is disabled, remove remaining methods from queue
1818 method->clear_queued_for_compilation();
1819 task->set_failure_reason("compilation is disabled");
1820 }
1821 }
1822 }
1823
1824 // Shut down compiler runtime
1825 shutdown_compiler_runtime(thread->compiler(), thread);
1826 }
1827
1828 // ------------------------------------------------------------------
1829 // CompileBroker::init_compiler_thread_log
1830 //
1831 // Set up state required by +LogCompilation.
1832 void CompileBroker::init_compiler_thread_log() {
1833 CompilerThread* thread = CompilerThread::current();
1834 char file_name[4*K];
1835 FILE* fp = NULL;
1836 intx thread_id = os::current_thread_id();
1837 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1838 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1839 if (dir == NULL) {
1840 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1841 thread_id, os::current_process_id());
1842 } else {
1843 jio_snprintf(file_name, sizeof(file_name),
1844 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1845 os::file_separator(), thread_id, os::current_process_id());
1846 }
1847
1848 fp = fopen(file_name, "wt");
1849 if (fp != NULL) {
1850 if (LogCompilation && Verbose) {
1851 tty->print_cr("Opening compilation log %s", file_name);
1852 }
1853 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1854 if (log == NULL) {
1855 fclose(fp);
1856 return;
1857 }
1858 thread->init_log(log);
1859
1860 if (xtty != NULL) {
1861 ttyLocker ttyl;
1862 // Record any per thread log files
1863 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1864 }
1865 return;
1866 }
1867 }
1868 warning("Cannot open log file: %s", file_name);
1869 }
1870
1871 // ------------------------------------------------------------------
1872 // CompileBroker::set_should_block
1873 //
1874 // Set _should_block.
1875 // Call this from the VM, with Threads_lock held and a safepoint requested.
1876 void CompileBroker::set_should_block() {
1877 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1878 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1879 #ifndef PRODUCT
1880 if (PrintCompilation && (Verbose || WizardMode))
1881 tty->print_cr("notifying compiler thread pool to block");
1882 #endif
1883 _should_block = true;
1884 }
1885
1886 // ------------------------------------------------------------------
1887 // CompileBroker::maybe_block
1888 //
1889 // Call this from the compiler at convenient points, to poll for _should_block.
1890 void CompileBroker::maybe_block() {
1891 if (_should_block) {
1892 #ifndef PRODUCT
1893 if (PrintCompilation && (Verbose || WizardMode))
1894 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1895 #endif
1896 ThreadInVMfromNative tivfn(JavaThread::current());
1897 }
1898 }
1899
1900 // wrapper for CodeCache::print_summary()
1901 static void codecache_print(bool detailed)
1902 {
1903 ResourceMark rm;
1904 stringStream s;
1905 // Dump code cache into a buffer before locking the tty,
1906 {
1907 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1908 CodeCache::print_summary(&s, detailed);
1909 }
1910 ttyLocker ttyl;
1911 tty->print("%s", s.as_string());
1912 }
1913
1914 static void post_compilation_event(EventCompilation* event, CompileTask* task) {
1915 assert(event != NULL, "invariant");
1916 assert(event->should_commit(), "invariant");
1917 event->set_method(task->method());
1918 event->set_compileId(task->compile_id());
1919 event->set_compileLevel(task->comp_level());
1920 event->set_succeded(task->is_success());
1921 event->set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
1922 event->set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1923 event->set_inlinedBytes(task->num_inlined_bytecodes());
1924 event->commit();
1925 }
1926
1927 // ------------------------------------------------------------------
1928 // CompileBroker::invoke_compiler_on_method
1929 //
1930 // Compile a method.
1931 //
1932 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1933 if (PrintCompilation) {
1934 ResourceMark rm;
1935 task->print_line();
1936 }
1937 elapsedTimer time;
1938
1939 CompilerThread* thread = CompilerThread::current();
1940 ResourceMark rm(thread);
1941
1942 if (LogEvents) {
1943 _compilation_log->log_compile(thread, task);
1944 }
1945
1946 // Common flags.
1947 uint compile_id = task->compile_id();
1948 int osr_bci = task->osr_bci();
1949 bool is_osr = (osr_bci != standard_entry_bci);
1950 bool should_log = (thread->log() != NULL);
1951 bool should_break = false;
1952 int task_level = task->comp_level();
1953 {
1954 // create the handle inside it's own block so it can't
1955 // accidentally be referenced once the thread transitions to
1956 // native. The NoHandleMark before the transition should catch
1957 // any cases where this occurs in the future.
1958 methodHandle method(thread, task->method());
1959 should_break = check_break_at(method, compile_id, is_osr);
1960 if (should_log && !CompilerOracle::should_log(method)) {
1961 should_log = false;
1962 }
1963 assert(!method->is_native(), "no longer compile natives");
1964
1965 // Save information about this method in case of failure.
1966 set_last_compile(thread, method, is_osr, task_level);
1967
1968 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1969 }
1970
1971 // Allocate a new set of JNI handles.
1972 push_jni_handle_block();
1973 Method* target_handle = task->method();
1974 int compilable = ciEnv::MethodCompilable;
1975 {
1976 int system_dictionary_modification_counter;
1977 {
1978 MutexLocker locker(Compile_lock, thread);
1979 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1980 }
1981
1982 NoHandleMark nhm;
1983 ThreadToNativeFromVM ttn(thread);
1984
1985 ciEnv ci_env(task, system_dictionary_modification_counter);
1986 if (should_break) {
1987 ci_env.set_break_at_compile(true);
1988 }
1989 if (should_log) {
1990 ci_env.set_log(thread->log());
1991 }
1992 assert(thread->env() == &ci_env, "set by ci_env");
1993 // The thread-env() field is cleared in ~CompileTaskWrapper.
1994
1995 // Cache Jvmti state
1996 ci_env.cache_jvmti_state();
1997
1998 // Cache DTrace flags
1999 ci_env.cache_dtrace_flags();
2000
2001 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2002
2003 TraceTime t1("compilation", &time);
2004 EventCompilation event;
2005
2006 AbstractCompiler *comp = compiler(task_level);
2007 if (comp == NULL) {
2008 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2009 } else {
2010 comp->compile_method(&ci_env, target, osr_bci);
2011 }
2012
2013 if (!ci_env.failing() && task->code() == NULL) {
2014 //assert(false, "compiler should always document failure");
2015 // The compiler elected, without comment, not to register a result.
2016 // Do not attempt further compilations of this method.
2017 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2018 }
2019
2020 // Copy this bit to the enclosing block:
2021 compilable = ci_env.compilable();
2022
2023 if (ci_env.failing()) {
2024 const char *failure_reason = ci_env.failure_reason();
2025 const char* retry_message = ci_env.retry_message();
2026 task->set_failure_reason(failure_reason);
2027 if (_compilation_log != NULL) {
2028 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2029 }
2030 if (PrintCompilation) {
2031 FormatBufferResource msg = retry_message != NULL ?
2032 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2033 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2034 task->print_compilation(tty, msg);
2035 }
2036
2037 EventCompilationFailure event;
2038 if (event.should_commit()) {
2039 event.set_compileId(compile_id);
2040 event.set_failureMessage(failure_reason);
2041 event.commit();
2042 }
2043 } else {
2044 task->mark_success();
2045 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2046 if (_compilation_log != NULL) {
2047 nmethod* code = task->code();
2048 if (code != NULL) {
2049 _compilation_log->log_nmethod(thread, code);
2050 }
2051 }
2052 }
2053 // simulate crash during compilation
2054 assert(task->compile_id() != CICrashAt, "just as planned");
2055 if (event.should_commit()) {
2056 post_compilation_event(&event, task);
2057 }
2058 }
2059 pop_jni_handle_block();
2060
2061 methodHandle method(thread, task->method());
2062
2063 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2064
2065 collect_statistics(thread, time, task);
2066
2067 if (PrintCompilation && PrintCompilation2) {
2068 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2069 tty->print("%4d ", compile_id); // print compilation number
2070 tty->print("%s ", (is_osr ? "%" : " "));
2071 if (task->code() != NULL) {
2072 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2073 }
2074 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2075 }
2076
2077 if (PrintCodeCacheOnCompilation)
2078 codecache_print(/* detailed= */ false);
2079
2080 // Disable compilation, if required.
2081 switch (compilable) {
2082 case ciEnv::MethodCompilable_never:
2083 if (is_osr)
2084 method->set_not_osr_compilable_quietly();
2085 else
2086 method->set_not_compilable_quietly();
2087 break;
2088 case ciEnv::MethodCompilable_not_at_tier:
2089 if (is_osr)
2090 method->set_not_osr_compilable_quietly(task_level);
2091 else
2092 method->set_not_compilable_quietly(task_level);
2093 break;
2094 }
2095
2096 // Note that the queued_for_compilation bits are cleared without
2097 // protection of a mutex. [They were set by the requester thread,
2098 // when adding the task to the compile queue -- at which time the
2099 // compile queue lock was held. Subsequently, we acquired the compile
2100 // queue lock to get this task off the compile queue; thus (to belabour
2101 // the point somewhat) our clearing of the bits must be occurring
2102 // only after the setting of the bits. See also 14012000 above.
2103 method->clear_queued_for_compilation();
2104
2105 #ifdef ASSERT
2106 if (CollectedHeap::fired_fake_oom()) {
2107 // The current compile received a fake OOM during compilation so
2108 // go ahead and exit the VM since the test apparently succeeded
2109 tty->print_cr("*** Shutting down VM after successful fake OOM");
2110 vm_exit(0);
2111 }
2112 #endif
2113 }
2114
2115 /**
2116 * The CodeCache is full. Print out warning and disable compilation
2117 * or try code cache cleaning so compilation can continue later.
2118 */
2119 void CompileBroker::handle_full_code_cache() {
2120 UseInterpreter = true;
2121 if (UseCompiler || AlwaysCompileLoopMethods ) {
2122 if (xtty != NULL) {
2123 ResourceMark rm;
2124 stringStream s;
2125 // Dump code cache state into a buffer before locking the tty,
2126 // because log_state() will use locks causing lock conflicts.
2127 CodeCache::log_state(&s);
2128 // Lock to prevent tearing
2129 ttyLocker ttyl;
2130 xtty->begin_elem("code_cache_full");
2131 xtty->print("%s", s.as_string());
2132 xtty->stamp();
2133 xtty->end_elem();
2134 }
2135
2136 CodeCache::report_codemem_full();
2137
2138 #ifndef PRODUCT
2139 if (CompileTheWorld || ExitOnFullCodeCache) {
2140 codecache_print(/* detailed= */ true);
2141 before_exit(JavaThread::current());
2142 exit_globals(); // will delete tty
2143 vm_direct_exit(CompileTheWorld ? 0 : 1);
2144 }
2145 #endif
2146 if (UseCodeCacheFlushing) {
2147 // Since code cache is full, immediately stop new compiles
2148 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2149 NMethodSweeper::log_sweep("disable_compiler");
2150 }
2151 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2152 // without having to consider the state in which the current thread is.
2153 ThreadInVMfromUnknown in_vm;
2154 NMethodSweeper::possibly_sweep();
2155 } else {
2156 disable_compilation_forever();
2157 }
2158
2159 // Print warning only once
2160 if (should_print_compiler_warning()) {
2161 warning("CodeCache is full. Compiler has been disabled.");
2162 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2163 codecache_print(/* detailed= */ true);
2164 }
2165 }
2166 }
2167
2168 // ------------------------------------------------------------------
2169 // CompileBroker::set_last_compile
2170 //
2171 // Record this compilation for debugging purposes.
2172 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2173 ResourceMark rm;
2174 char* method_name = method->name()->as_C_string();
2175 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2176 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2177 char current_method[CompilerCounters::cmname_buffer_length];
2178 size_t maxLen = CompilerCounters::cmname_buffer_length;
2179
2180 if (UsePerfData) {
2181 const char* class_name = method->method_holder()->name()->as_C_string();
2182
2183 size_t s1len = strlen(class_name);
2184 size_t s2len = strlen(method_name);
2185
2186 // check if we need to truncate the string
2187 if (s1len + s2len + 2 > maxLen) {
2188
2189 // the strategy is to lop off the leading characters of the
2190 // class name and the trailing characters of the method name.
2191
2192 if (s2len + 2 > maxLen) {
2193 // lop of the entire class name string, let snprintf handle
2194 // truncation of the method name.
2195 class_name += s1len; // null string
2196 }
2197 else {
2198 // lop off the extra characters from the front of the class name
2199 class_name += ((s1len + s2len + 2) - maxLen);
2200 }
2201 }
2202
2203 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2204 }
2205
2206 if (CICountOSR && is_osr) {
2207 _last_compile_type = osr_compile;
2208 } else {
2209 _last_compile_type = normal_compile;
2210 }
2211 _last_compile_level = comp_level;
2212
2213 if (UsePerfData) {
2214 CompilerCounters* counters = thread->counters();
2215 counters->set_current_method(current_method);
2216 counters->set_compile_type((jlong)_last_compile_type);
2217 }
2218 }
2219
2220
2221 // ------------------------------------------------------------------
2222 // CompileBroker::push_jni_handle_block
2223 //
2224 // Push on a new block of JNI handles.
2225 void CompileBroker::push_jni_handle_block() {
2226 JavaThread* thread = JavaThread::current();
2227
2228 // Allocate a new block for JNI handles.
2229 // Inlined code from jni_PushLocalFrame()
2230 JNIHandleBlock* java_handles = thread->active_handles();
2231 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2232 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2233 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2234 thread->set_active_handles(compile_handles);
2235 }
2236
2237
2238 // ------------------------------------------------------------------
2239 // CompileBroker::pop_jni_handle_block
2240 //
2241 // Pop off the current block of JNI handles.
2242 void CompileBroker::pop_jni_handle_block() {
2243 JavaThread* thread = JavaThread::current();
2244
2245 // Release our JNI handle block
2246 JNIHandleBlock* compile_handles = thread->active_handles();
2247 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2248 thread->set_active_handles(java_handles);
2249 compile_handles->set_pop_frame_link(NULL);
2250 JNIHandleBlock::release_block(compile_handles, thread); // may block
2251 }
2252
2253
2254 // ------------------------------------------------------------------
2255 // CompileBroker::check_break_at
2256 //
2257 // Should the compilation break at the current compilation.
2258 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2259 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2260 return true;
2261 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2262 return true;
2263 } else {
2264 return (compile_id == CIBreakAt);
2265 }
2266 }
2267
2268 // ------------------------------------------------------------------
2269 // CompileBroker::collect_statistics
2270 //
2271 // Collect statistics about the compilation.
2272
2273 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2274 bool success = task->is_success();
2275 methodHandle method (thread, task->method());
2276 uint compile_id = task->compile_id();
2277 bool is_osr = (task->osr_bci() != standard_entry_bci);
2278 nmethod* code = task->code();
2279 CompilerCounters* counters = thread->counters();
2280
2281 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2282 MutexLocker locker(CompileStatistics_lock);
2283
2284 // _perf variables are production performance counters which are
2285 // updated regardless of the setting of the CITime and CITimeEach flags
2286 //
2287 if (!success) {
2288 _total_bailout_count++;
2289 if (UsePerfData) {
2290 _perf_last_failed_method->set_value(counters->current_method());
2291 _perf_last_failed_type->set_value(counters->compile_type());
2292 _perf_total_bailout_count->inc();
2293 }
2294 } else if (code == NULL) {
2295 if (UsePerfData) {
2296 _perf_last_invalidated_method->set_value(counters->current_method());
2297 _perf_last_invalidated_type->set_value(counters->compile_type());
2298 _perf_total_invalidated_count->inc();
2299 }
2300 _total_invalidated_count++;
2301 } else {
2302 // Compilation succeeded
2303
2304 // update compilation ticks - used by the implementation of
2305 // java.lang.management.CompilationMBean
2306 _perf_total_compilation->inc(time.ticks());
2307
2308 _t_total_compilation.add(time);
2309 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2310
2311 if (CITime) {
2312 if (is_osr) {
2313 _t_osr_compilation.add(time);
2314 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2315 } else {
2316 _t_standard_compilation.add(time);
2317 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2318 }
2319 }
2320
2321 if (UsePerfData) {
2322 // save the name of the last method compiled
2323 _perf_last_method->set_value(counters->current_method());
2324 _perf_last_compile_type->set_value(counters->compile_type());
2325 _perf_last_compile_size->set_value(method->code_size() +
2326 task->num_inlined_bytecodes());
2327 if (is_osr) {
2328 _perf_osr_compilation->inc(time.ticks());
2329 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2330 } else {
2331 _perf_standard_compilation->inc(time.ticks());
2332 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2333 }
2334 }
2335
2336 if (CITimeEach) {
2337 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2338 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2339 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2340 }
2341
2342 // Collect counts of successful compilations
2343 _sum_nmethod_size += code->total_size();
2344 _sum_nmethod_code_size += code->insts_size();
2345 _total_compile_count++;
2346
2347 if (UsePerfData) {
2348 _perf_sum_nmethod_size->inc( code->total_size());
2349 _perf_sum_nmethod_code_size->inc(code->insts_size());
2350 _perf_total_compile_count->inc();
2351 }
2352
2353 if (is_osr) {
2354 if (UsePerfData) _perf_total_osr_compile_count->inc();
2355 _total_osr_compile_count++;
2356 } else {
2357 if (UsePerfData) _perf_total_standard_compile_count->inc();
2358 _total_standard_compile_count++;
2359 }
2360 }
2361 // set the current method for the thread to null
2362 if (UsePerfData) counters->set_current_method("");
2363 }
2364
2365 const char* CompileBroker::compiler_name(int comp_level) {
2366 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2367 if (comp == NULL) {
2368 return "no compiler";
2369 } else {
2370 return (comp->name());
2371 }
2372 }
2373
2374 void CompileBroker::print_times() {
2375 tty->cr();
2376 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2377 tty->print_cr("------------------------------------------------");
2378 //0000000000111111111122222222223333333333444444444455555555556666666666
2379 //0123456789012345678901234567890123456789012345678901234567890123456789
2380 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2381 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2382 CompileBroker::_t_standard_compilation.seconds(),
2383 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2384 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);
2385
2386 AbstractCompiler *comp = compiler(CompLevel_simple);
2387 if (comp != NULL) {
2388 comp->print_timers();
2389 }
2390 comp = compiler(CompLevel_full_optimization);
2391 if (comp != NULL) {
2392 comp->print_timers();
2393 }
2394 tty->cr();
2395 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2396 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2397 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2398 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2399 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2400 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2401 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2402 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2403 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2404 tty->cr();
2405 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2406 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2407 }
2408
2409 // Debugging output for failure
2410 void CompileBroker::print_last_compile() {
2411 if ( _last_compile_level != CompLevel_none &&
2412 compiler(_last_compile_level) != NULL &&
2413 _last_method_compiled != NULL &&
2414 _last_compile_type != no_compile) {
2415 if (_last_compile_type == osr_compile) {
2416 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2417 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2418 } else {
2419 tty->print_cr("Last parse: %d+++(%d) %s",
2420 _compilation_id, _last_compile_level, _last_method_compiled);
2421 }
2422 }
2423 }
2424
2425
2426 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2427 #ifndef PRODUCT
2428 st->print_cr("Compiler thread printing unimplemented.");
2429 st->cr();
2430 #endif
2431 }