1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodData.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/interfaceSupport.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "trace/tracing.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #ifdef COMPILER1
50 #include "c1/c1_Compiler.hpp"
51 #endif
52 #ifdef COMPILER2
53 #include "opto/c2compiler.hpp"
54 #endif
55 #ifdef SHARK
56 #include "shark/sharkCompiler.hpp"
57 #endif
58
59 #ifdef DTRACE_ENABLED
60
61 // Only bother with this argument setup if dtrace is available
62
63 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
64 { \
65 Symbol* klass_name = (method)->klass_name(); \
66 Symbol* name = (method)->name(); \
67 Symbol* signature = (method)->signature(); \
68 HOTSPOT_METHOD_COMPILE_BEGIN( \
69 (char *) comp_name, strlen(comp_name), \
70 (char *) klass_name->bytes(), klass_name->utf8_length(), \
71 (char *) name->bytes(), name->utf8_length(), \
72 (char *) signature->bytes(), signature->utf8_length()); \
73 }
74
75 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
76 { \
77 Symbol* klass_name = (method)->klass_name(); \
78 Symbol* name = (method)->name(); \
79 Symbol* signature = (method)->signature(); \
80 HOTSPOT_METHOD_COMPILE_END( \
81 (char *) comp_name, strlen(comp_name), \
82 (char *) klass_name->bytes(), klass_name->utf8_length(), \
83 (char *) name->bytes(), name->utf8_length(), \
84 (char *) signature->bytes(), signature->utf8_length(), (success)); \
85 }
86
87 #else // ndef DTRACE_ENABLED
88
89 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
90 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
91
92 #endif // ndef DTRACE_ENABLED
93
94 bool CompileBroker::_initialized = false;
95 volatile bool CompileBroker::_should_block = false;
96 volatile jint CompileBroker::_print_compilation_warning = 0;
97 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
98
99 // The installed compiler(s)
100 AbstractCompiler* CompileBroker::_compilers[2];
101
102 // These counters are used to assign an unique ID to each compilation.
103 volatile jint CompileBroker::_compilation_id = 0;
104 volatile jint CompileBroker::_osr_compilation_id = 0;
105
106 // Debugging information
107 int CompileBroker::_last_compile_type = no_compile;
108 int CompileBroker::_last_compile_level = CompLevel_none;
109 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
110
111 // Performance counters
112 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
113 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
114 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
115
116 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
117 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
118 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
119 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
121
122 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
123 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
124 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
125 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
126
127 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
128 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
129 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
130 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
131 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
132 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
133 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
134
135 // Timers and counters for generating statistics
136 elapsedTimer CompileBroker::_t_total_compilation;
137 elapsedTimer CompileBroker::_t_osr_compilation;
138 elapsedTimer CompileBroker::_t_standard_compilation;
139
140 int CompileBroker::_total_bailout_count = 0;
141 int CompileBroker::_total_invalidated_count = 0;
142 int CompileBroker::_total_compile_count = 0;
143 int CompileBroker::_total_osr_compile_count = 0;
144 int CompileBroker::_total_standard_compile_count = 0;
145
146 int CompileBroker::_sum_osr_bytes_compiled = 0;
147 int CompileBroker::_sum_standard_bytes_compiled = 0;
148 int CompileBroker::_sum_nmethod_size = 0;
149 int CompileBroker::_sum_nmethod_code_size = 0;
150
151 long CompileBroker::_peak_compilation_time = 0;
152
153 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
154 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
155
156 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
157
158
159 class CompilationLog : public StringEventLog {
160 public:
161 CompilationLog() : StringEventLog("Compilation events") {
162 }
163
164 void log_compile(JavaThread* thread, CompileTask* task) {
165 StringLogMessage lm;
166 stringStream sstr = lm.stream();
167 // msg.time_stamp().update_to(tty->time_stamp().ticks());
168 task->print_compilation(&sstr, NULL, true);
169 log(thread, "%s", (const char*)lm);
170 }
171
172 void log_nmethod(JavaThread* thread, nmethod* nm) {
173 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
174 nm->compile_id(), nm->is_osr_method() ? "%" : "",
175 nm, nm->code_begin(), nm->code_end());
176 }
177
178 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
179 StringLogMessage lm;
180 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
181 if (retry_message != NULL) {
182 lm.append(" (%s)", retry_message);
183 }
184 lm.print("\n");
185 log(thread, "%s", (const char*)lm);
186 }
187 };
188
189 static CompilationLog* _compilation_log = NULL;
190
191 void compileBroker_init() {
192 if (LogEvents) {
193 _compilation_log = new CompilationLog();
194 }
195 }
196
197 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
198 CompilerThread* thread = CompilerThread::current();
199 thread->set_task(task);
200 CompileLog* log = thread->log();
201 if (log != NULL) task->log_task_start(log);
202 }
203
204 CompileTaskWrapper::~CompileTaskWrapper() {
205 CompilerThread* thread = CompilerThread::current();
206 CompileTask* task = thread->task();
207 CompileLog* log = thread->log();
208 if (log != NULL) task->log_task_done(log);
209 thread->set_task(NULL);
210 task->set_code_handle(NULL);
211 thread->set_env(NULL);
212 if (task->is_blocking()) {
213 MutexLocker notifier(task->lock(), thread);
214 task->mark_complete();
215 // Notify the waiting thread that the compilation has completed.
216 task->lock()->notify_all();
217 } else {
218 task->mark_complete();
219
220 // By convention, the compiling thread is responsible for
221 // recycling a non-blocking CompileTask.
222 CompileTask::free(task);
223 }
224 }
225
226
227 CompileTask* CompileTask::_task_free_list = NULL;
228 #ifdef ASSERT
229 int CompileTask::_num_allocated_tasks = 0;
230 #endif
231 /**
232 * Allocate a CompileTask, from the free list if possible.
233 */
234 CompileTask* CompileTask::allocate() {
235 MutexLocker locker(CompileTaskAlloc_lock);
236 CompileTask* task = NULL;
237
238 if (_task_free_list != NULL) {
239 task = _task_free_list;
240 _task_free_list = task->next();
241 task->set_next(NULL);
242 } else {
243 task = new CompileTask();
244 DEBUG_ONLY(_num_allocated_tasks++;)
245 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
246 task->set_next(NULL);
247 task->set_is_free(true);
248 }
249 assert(task->is_free(), "Task must be free.");
250 task->set_is_free(false);
251 return task;
252 }
253
254
255 /**
256 * Add a task to the free list.
257 */
258 void CompileTask::free(CompileTask* task) {
259 MutexLocker locker(CompileTaskAlloc_lock);
260 if (!task->is_free()) {
261 task->set_code(NULL);
262 assert(!task->lock()->is_locked(), "Should not be locked when freed");
263 JNIHandles::destroy_global(task->_method_holder);
264 JNIHandles::destroy_global(task->_hot_method_holder);
265
266 task->set_is_free(true);
267 task->set_next(_task_free_list);
268 _task_free_list = task;
269 }
270 }
271
272 void CompileTask::initialize(int compile_id,
273 methodHandle method,
274 int osr_bci,
275 int comp_level,
276 methodHandle hot_method,
277 int hot_count,
278 const char* comment,
279 bool is_blocking) {
280 assert(!_lock->is_locked(), "bad locking");
281
282 _compile_id = compile_id;
283 _method = method();
284 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
285 _osr_bci = osr_bci;
286 _is_blocking = is_blocking;
287 _comp_level = comp_level;
288 _num_inlined_bytecodes = 0;
289
290 _is_complete = false;
291 _is_success = false;
292 _code_handle = NULL;
293
294 _hot_method = NULL;
295 _hot_method_holder = NULL;
296 _hot_count = hot_count;
297 _time_queued = 0; // tidy
298 _comment = comment;
299
300 if (LogCompilation) {
301 _time_queued = os::elapsed_counter();
302 if (hot_method.not_null()) {
303 if (hot_method == method) {
304 _hot_method = _method;
305 } else {
306 _hot_method = hot_method();
307 // only add loader or mirror if different from _method_holder
308 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
309 }
310 }
311 }
312
313 _next = NULL;
314 }
315
316 // ------------------------------------------------------------------
317 // CompileTask::code/set_code
318 nmethod* CompileTask::code() const {
319 if (_code_handle == NULL) return NULL;
320 return _code_handle->code();
321 }
322 void CompileTask::set_code(nmethod* nm) {
323 if (_code_handle == NULL && nm == NULL) return;
324 guarantee(_code_handle != NULL, "");
325 _code_handle->set_code(nm);
326 if (nm == NULL) _code_handle = NULL; // drop the handle also
327 }
328
329
330 void CompileTask::mark_on_stack() {
331 // Mark these methods as something redefine classes cannot remove.
332 _method->set_on_stack(true);
333 if (_hot_method != NULL) {
334 _hot_method->set_on_stack(true);
335 }
336 }
337
338 // ------------------------------------------------------------------
339 // CompileTask::print
340 void CompileTask::print() {
341 tty->print("<CompileTask compile_id=%d ", _compile_id);
342 tty->print("method=");
343 _method->print_name(tty);
344 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
345 _osr_bci, bool_to_str(_is_blocking),
346 bool_to_str(_is_complete), bool_to_str(_is_success));
347 }
348
349
350 // ------------------------------------------------------------------
351 // CompileTask::print_line_on_error
352 //
353 // This function is called by fatal error handler when the thread
354 // causing troubles is a compiler thread.
355 //
356 // Do not grab any lock, do not allocate memory.
357 //
358 // Otherwise it's the same as CompileTask::print_line()
359 //
360 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
361 // print compiler name
362 st->print("%s:", CompileBroker::compiler_name(comp_level()));
363 print_compilation(st);
364 }
365
366 // ------------------------------------------------------------------
367 // CompileTask::print_line
368 void CompileTask::print_line() {
369 ttyLocker ttyl; // keep the following output all in one block
370 // print compiler name if requested
371 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
372 print_compilation();
373 }
374
375
376 // ------------------------------------------------------------------
377 // CompileTask::print_compilation_impl
378 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
379 bool is_osr_method, int osr_bci, bool is_blocking,
380 const char* msg, bool short_form) {
381 if (!short_form) {
382 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
383 }
384 st->print("%4d ", compile_id); // print compilation number
385
386 // For unloaded methods the transition to zombie occurs after the
387 // method is cleared so it's impossible to report accurate
388 // information for that case.
389 bool is_synchronized = false;
390 bool has_exception_handler = false;
391 bool is_native = false;
392 if (method != NULL) {
393 is_synchronized = method->is_synchronized();
394 has_exception_handler = method->has_exception_handler();
395 is_native = method->is_native();
396 }
397 // method attributes
398 const char compile_type = is_osr_method ? '%' : ' ';
399 const char sync_char = is_synchronized ? 's' : ' ';
400 const char exception_char = has_exception_handler ? '!' : ' ';
401 const char blocking_char = is_blocking ? 'b' : ' ';
402 const char native_char = is_native ? 'n' : ' ';
403
404 // print method attributes
405 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
406
407 if (TieredCompilation) {
408 if (comp_level != -1) st->print("%d ", comp_level);
409 else st->print("- ");
410 }
411 st->print(" "); // more indent
412
413 if (method == NULL) {
414 st->print("(method)");
415 } else {
416 method->print_short_name(st);
417 if (is_osr_method) {
418 st->print(" @ %d", osr_bci);
419 }
420 if (method->is_native())
421 st->print(" (native)");
422 else
423 st->print(" (%d bytes)", method->code_size());
424 }
425
426 if (msg != NULL) {
427 st->print(" %s", msg);
428 }
429 if (!short_form) {
430 st->cr();
431 }
432 }
433
434 // ------------------------------------------------------------------
435 // CompileTask::print_inlining
436 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
437 // 1234567
438 st->print(" "); // print timestamp
439 // 1234
440 st->print(" "); // print compilation number
441
442 // method attributes
443 if (method->is_loaded()) {
444 const char sync_char = method->is_synchronized() ? 's' : ' ';
445 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
446 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
447
448 // print method attributes
449 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
450 } else {
451 // %s!bn
452 st->print(" "); // print method attributes
453 }
454
455 if (TieredCompilation) {
456 st->print(" ");
457 }
458 st->print(" "); // more indent
459 st->print(" "); // initial inlining indent
460
461 for (int i = 0; i < inline_level; i++) st->print(" ");
462
463 st->print("@ %d ", bci); // print bci
464 method->print_short_name(st);
465 if (method->is_loaded())
466 st->print(" (%d bytes)", method->code_size());
467 else
468 st->print(" (not loaded)");
469
470 if (msg != NULL) {
471 st->print(" %s", msg);
472 }
473 st->cr();
474 }
475
476 // ------------------------------------------------------------------
477 // CompileTask::print_inline_indent
478 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
479 // 1234567
480 st->print(" "); // print timestamp
481 // 1234
482 st->print(" "); // print compilation number
483 // %s!bn
484 st->print(" "); // print method attributes
485 if (TieredCompilation) {
486 st->print(" ");
487 }
488 st->print(" "); // more indent
489 st->print(" "); // initial inlining indent
490 for (int i = 0; i < inline_level; i++) st->print(" ");
491 }
492
493 // ------------------------------------------------------------------
494 // CompileTask::print_compilation
495 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
496 bool is_osr_method = osr_bci() != InvocationEntryBci;
497 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
498 }
499
500 // ------------------------------------------------------------------
501 // CompileTask::log_task
502 void CompileTask::log_task(xmlStream* log) {
503 Thread* thread = Thread::current();
504 methodHandle method(thread, this->method());
505 ResourceMark rm(thread);
506
507 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
508 log->print(" compile_id='%d'", _compile_id);
509 if (_osr_bci != CompileBroker::standard_entry_bci) {
510 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
511 } // else compile_kind='c2c'
512 if (!method.is_null()) log->method(method);
513 if (_osr_bci != CompileBroker::standard_entry_bci) {
514 log->print(" osr_bci='%d'", _osr_bci);
515 }
516 if (_comp_level != CompLevel_highest_tier) {
517 log->print(" level='%d'", _comp_level);
518 }
519 if (_is_blocking) {
520 log->print(" blocking='1'");
521 }
522 log->stamp();
523 }
524
525
526 // ------------------------------------------------------------------
527 // CompileTask::log_task_queued
528 void CompileTask::log_task_queued() {
529 Thread* thread = Thread::current();
530 ttyLocker ttyl;
531 ResourceMark rm(thread);
532
533 xtty->begin_elem("task_queued");
534 log_task(xtty);
535 if (_comment != NULL) {
536 xtty->print(" comment='%s'", _comment);
537 }
538 if (_hot_method != NULL) {
539 methodHandle hot(thread, _hot_method);
540 methodHandle method(thread, _method);
541 if (hot() != method()) {
542 xtty->method(hot);
543 }
544 }
545 if (_hot_count != 0) {
546 xtty->print(" hot_count='%d'", _hot_count);
547 }
548 xtty->end_elem();
549 }
550
551
552 // ------------------------------------------------------------------
553 // CompileTask::log_task_start
554 void CompileTask::log_task_start(CompileLog* log) {
555 log->begin_head("task");
556 log_task(log);
557 log->end_head();
558 }
559
560
561 // ------------------------------------------------------------------
562 // CompileTask::log_task_done
563 void CompileTask::log_task_done(CompileLog* log) {
564 Thread* thread = Thread::current();
565 methodHandle method(thread, this->method());
566 ResourceMark rm(thread);
567
568 // <task_done ... stamp='1.234'> </task>
569 nmethod* nm = code();
570 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
571 _is_success, nm == NULL ? 0 : nm->content_size(),
572 method->invocation_count());
573 int bec = method->backedge_count();
574 if (bec != 0) log->print(" backedge_count='%d'", bec);
575 // Note: "_is_complete" is about to be set, but is not.
576 if (_num_inlined_bytecodes != 0) {
577 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
578 }
579 log->stamp();
580 log->end_elem();
581 log->tail("task");
582 log->clear_identities(); // next task will have different CI
583 if (log->unflushed_count() > 2000) {
584 log->flush();
585 }
586 log->mark_file_end();
587 }
588
589
590
591 /**
592 * Add a CompileTask to a CompileQueue
593 */
594 void CompileQueue::add(CompileTask* task) {
595 assert(lock()->owned_by_self(), "must own lock");
596 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
597
598 task->set_next(NULL);
599 task->set_prev(NULL);
600
601 if (_last == NULL) {
602 // The compile queue is empty.
603 assert(_first == NULL, "queue is empty");
604 _first = task;
605 _last = task;
606 } else {
607 // Append the task to the queue.
608 assert(_last->next() == NULL, "not last");
609 _last->set_next(task);
610 task->set_prev(_last);
611 _last = task;
612 }
613 ++_size;
614
615 // Mark the method as being in the compile queue.
616 task->method()->set_queued_for_compilation();
617
618 NOT_PRODUCT(print();)
619
620 if (LogCompilation && xtty != NULL) {
621 task->log_task_queued();
622 }
623
624 // Notify CompilerThreads that a task is available.
625 lock()->notify_all();
626 }
627
628 /**
629 * Empties compilation queue by putting all compilation tasks onto
630 * a freelist. Furthermore, the method wakes up all threads that are
631 * waiting on a compilation task to finish. This can happen if background
632 * compilation is disabled.
633 */
634 void CompileQueue::free_all() {
635 MutexLocker mu(lock());
636 CompileTask* next = _first;
637
638 // Iterate over all tasks in the compile queue
639 while (next != NULL) {
640 CompileTask* current = next;
641 next = current->next();
642 // Wake up thread that blocks on the compile task.
643 current->lock()->notify();
644 // Put the task back on the freelist.
645 CompileTask::free(current);
646 }
647 _first = NULL;
648
649 // Wake up all threads that block on the queue.
650 lock()->notify_all();
651 }
652
653 // ------------------------------------------------------------------
654 // CompileQueue::get
655 //
656 // Get the next CompileTask from a CompileQueue
657 CompileTask* CompileQueue::get() {
658 NMethodSweeper::possibly_sweep();
659
660 MutexLocker locker(lock());
661 // If _first is NULL we have no more compile jobs. There are two reasons for
662 // having no compile jobs: First, we compiled everything we wanted. Second,
663 // we ran out of code cache so compilation has been disabled. In the latter
664 // case we perform code cache sweeps to free memory such that we can re-enable
665 // compilation.
666 while (_first == NULL) {
667 // Exit loop if compilation is disabled forever
668 if (CompileBroker::is_compilation_disabled_forever()) {
669 return NULL;
670 }
671
672 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
673 // Wait a certain amount of time to possibly do another sweep.
674 // We must wait until stack scanning has happened so that we can
675 // transition a method's state from 'not_entrant' to 'zombie'.
676 long wait_time = NmethodSweepCheckInterval * 1000;
677 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
678 // Only one thread at a time can do sweeping. Scale the
679 // wait time according to the number of compiler threads.
680 // As a result, the next sweep is likely to happen every 100ms
681 // with an arbitrary number of threads that do sweeping.
682 wait_time = 100 * CICompilerCount;
683 }
684 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
685 if (timeout) {
686 MutexUnlocker ul(lock());
687 NMethodSweeper::possibly_sweep();
688 }
689 } else {
690 // If there are no compilation tasks and we can compile new jobs
691 // (i.e., there is enough free space in the code cache) there is
692 // no need to invoke the sweeper. As a result, the hotness of methods
693 // remains unchanged. This behavior is desired, since we want to keep
694 // the stable state, i.e., we do not want to evict methods from the
695 // code cache if it is unnecessary.
696 // We need a timed wait here, since compiler threads can exit if compilation
697 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
698 // is not critical and we do not want idle compiler threads to wake up too often.
699 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
700 }
701 }
702
703 if (CompileBroker::is_compilation_disabled_forever()) {
704 return NULL;
705 }
706
707 CompileTask* task;
708 {
709 No_Safepoint_Verifier nsv;
710 task = CompilationPolicy::policy()->select_task(this);
711 }
712 remove(task);
713 purge_stale_tasks(); // may temporarily release MCQ lock
714 return task;
715 }
716
717 // Clean & deallocate stale compile tasks.
718 // Temporarily releases MethodCompileQueue lock.
719 void CompileQueue::purge_stale_tasks() {
720 assert(lock()->owned_by_self(), "must own lock");
721 if (_first_stale != NULL) {
722 // Stale tasks are purged when MCQ lock is released,
723 // but _first_stale updates are protected by MCQ lock.
724 // Once task processing starts and MCQ lock is released,
725 // other compiler threads can reuse _first_stale.
726 CompileTask* head = _first_stale;
727 _first_stale = NULL;
728 {
729 MutexUnlocker ul(lock());
730 for (CompileTask* task = head; task != NULL; ) {
731 CompileTask* next_task = task->next();
732 CompileTaskWrapper ctw(task); // Frees the task
733 task->method()->clear_queued_for_compilation();
734 task = next_task;
735 }
736 }
737 }
738 }
739
740 void CompileQueue::remove(CompileTask* task) {
741 assert(lock()->owned_by_self(), "must own lock");
742 if (task->prev() != NULL) {
743 task->prev()->set_next(task->next());
744 } else {
745 // max is the first element
746 assert(task == _first, "Sanity");
747 _first = task->next();
748 }
749
750 if (task->next() != NULL) {
751 task->next()->set_prev(task->prev());
752 } else {
753 // max is the last element
754 assert(task == _last, "Sanity");
755 _last = task->prev();
756 }
757 --_size;
758 }
759
760 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
761 assert(lock()->owned_by_self(), "must own lock");
762 remove(task);
763
764 // Enqueue the task for reclamation (should be done outside MCQ lock)
765 task->set_next(_first_stale);
766 task->set_prev(NULL);
767 _first_stale = task;
768 }
769
770 // methods in the compile queue need to be marked as used on the stack
771 // so that they don't get reclaimed by Redefine Classes
772 void CompileQueue::mark_on_stack() {
773 CompileTask* task = _first;
774 while (task != NULL) {
775 task->mark_on_stack();
776 task = task->next();
777 }
778 }
779
780 #ifndef PRODUCT
781 /**
782 * Print entire compilation queue.
783 */
784 void CompileQueue::print() {
785 if (CIPrintCompileQueue) {
786 ttyLocker ttyl;
787 tty->print_cr("Contents of %s", name());
788 tty->print_cr("----------------------");
789 CompileTask* task = _first;
790 while (task != NULL) {
791 task->print_line();
792 task = task->next();
793 }
794 tty->print_cr("----------------------");
795 }
796 }
797 #endif // PRODUCT
798
799 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
800
801 _current_method[0] = '\0';
802 _compile_type = CompileBroker::no_compile;
803
804 if (UsePerfData) {
805 ResourceMark rm;
806
807 // create the thread instance name space string - don't create an
808 // instance subspace if instance is -1 - keeps the adapterThread
809 // counters from having a ".0" namespace.
810 const char* thread_i = (instance == -1) ? thread_name :
811 PerfDataManager::name_space(thread_name, instance);
812
813
814 char* name = PerfDataManager::counter_name(thread_i, "method");
815 _perf_current_method =
816 PerfDataManager::create_string_variable(SUN_CI, name,
817 cmname_buffer_length,
818 _current_method, CHECK);
819
820 name = PerfDataManager::counter_name(thread_i, "type");
821 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
822 PerfData::U_None,
823 (jlong)_compile_type,
824 CHECK);
825
826 name = PerfDataManager::counter_name(thread_i, "time");
827 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
828 PerfData::U_Ticks, CHECK);
829
830 name = PerfDataManager::counter_name(thread_i, "compiles");
831 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
832 PerfData::U_Events, CHECK);
833 }
834 }
835
836 // ------------------------------------------------------------------
837 // CompileBroker::compilation_init
838 //
839 // Initialize the Compilation object
840 void CompileBroker::compilation_init() {
841 _last_method_compiled[0] = '\0';
842
843 // No need to initialize compilation system if we do not use it.
844 if (!UseCompiler) {
845 return;
846 }
847 #ifndef SHARK
848 // Set the interface to the current compiler(s).
849 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
850 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
851 #ifdef COMPILER1
852 if (c1_count > 0) {
853 _compilers[0] = new Compiler();
854 }
855 #endif // COMPILER1
856
857 #ifdef COMPILER2
858 if (c2_count > 0) {
859 _compilers[1] = new C2Compiler();
860 }
861 #endif // COMPILER2
862
863 #else // SHARK
864 int c1_count = 0;
865 int c2_count = 1;
866
867 _compilers[1] = new SharkCompiler();
868 #endif // SHARK
869
870 // Start the CompilerThreads
871 init_compiler_threads(c1_count, c2_count);
872 // totalTime performance counter is always created as it is required
873 // by the implementation of java.lang.management.CompilationMBean.
874 {
875 EXCEPTION_MARK;
876 _perf_total_compilation =
877 PerfDataManager::create_counter(JAVA_CI, "totalTime",
878 PerfData::U_Ticks, CHECK);
879 }
880
881
882 if (UsePerfData) {
883
884 EXCEPTION_MARK;
885
886 // create the jvmstat performance counters
887 _perf_osr_compilation =
888 PerfDataManager::create_counter(SUN_CI, "osrTime",
889 PerfData::U_Ticks, CHECK);
890
891 _perf_standard_compilation =
892 PerfDataManager::create_counter(SUN_CI, "standardTime",
893 PerfData::U_Ticks, CHECK);
894
895 _perf_total_bailout_count =
896 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
897 PerfData::U_Events, CHECK);
898
899 _perf_total_invalidated_count =
900 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
901 PerfData::U_Events, CHECK);
902
903 _perf_total_compile_count =
904 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
905 PerfData::U_Events, CHECK);
906 _perf_total_osr_compile_count =
907 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
908 PerfData::U_Events, CHECK);
909
910 _perf_total_standard_compile_count =
911 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
912 PerfData::U_Events, CHECK);
913
914 _perf_sum_osr_bytes_compiled =
915 PerfDataManager::create_counter(SUN_CI, "osrBytes",
916 PerfData::U_Bytes, CHECK);
917
918 _perf_sum_standard_bytes_compiled =
919 PerfDataManager::create_counter(SUN_CI, "standardBytes",
920 PerfData::U_Bytes, CHECK);
921
922 _perf_sum_nmethod_size =
923 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
924 PerfData::U_Bytes, CHECK);
925
926 _perf_sum_nmethod_code_size =
927 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
928 PerfData::U_Bytes, CHECK);
929
930 _perf_last_method =
931 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
932 CompilerCounters::cmname_buffer_length,
933 "", CHECK);
934
935 _perf_last_failed_method =
936 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
937 CompilerCounters::cmname_buffer_length,
938 "", CHECK);
939
940 _perf_last_invalidated_method =
941 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
942 CompilerCounters::cmname_buffer_length,
943 "", CHECK);
944
945 _perf_last_compile_type =
946 PerfDataManager::create_variable(SUN_CI, "lastType",
947 PerfData::U_None,
948 (jlong)CompileBroker::no_compile,
949 CHECK);
950
951 _perf_last_compile_size =
952 PerfDataManager::create_variable(SUN_CI, "lastSize",
953 PerfData::U_Bytes,
954 (jlong)CompileBroker::no_compile,
955 CHECK);
956
957
958 _perf_last_failed_type =
959 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
960 PerfData::U_None,
961 (jlong)CompileBroker::no_compile,
962 CHECK);
963
964 _perf_last_invalidated_type =
965 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
966 PerfData::U_None,
967 (jlong)CompileBroker::no_compile,
968 CHECK);
969 }
970
971 _initialized = true;
972 }
973
974
975 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
976 AbstractCompiler* comp, TRAPS) {
977 CompilerThread* compiler_thread = NULL;
978
979 Klass* k =
980 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
981 true, CHECK_0);
982 instanceKlassHandle klass (THREAD, k);
983 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
984 Handle string = java_lang_String::create_from_str(name, CHECK_0);
985
986 // Initialize thread_oop to put it into the system threadGroup
987 Handle thread_group (THREAD, Universe::system_thread_group());
988 JavaValue result(T_VOID);
989 JavaCalls::call_special(&result, thread_oop,
990 klass,
991 vmSymbols::object_initializer_name(),
992 vmSymbols::threadgroup_string_void_signature(),
993 thread_group,
994 string,
995 CHECK_0);
996
997 {
998 MutexLocker mu(Threads_lock, THREAD);
999 compiler_thread = new CompilerThread(queue, counters);
1000 // At this point the new CompilerThread data-races with this startup
1001 // thread (which I believe is the primoridal thread and NOT the VM
1002 // thread). This means Java bytecodes being executed at startup can
1003 // queue compile jobs which will run at whatever default priority the
1004 // newly created CompilerThread runs at.
1005
1006
1007 // At this point it may be possible that no osthread was created for the
1008 // JavaThread due to lack of memory. We would have to throw an exception
1009 // in that case. However, since this must work and we do not allow
1010 // exceptions anyway, check and abort if this fails.
1011
1012 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1013 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1014 os::native_thread_creation_failed_msg());
1015 }
1016
1017 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1018
1019 // Note that this only sets the JavaThread _priority field, which by
1020 // definition is limited to Java priorities and not OS priorities.
1021 // The os-priority is set in the CompilerThread startup code itself
1022
1023 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1024
1025 // Note that we cannot call os::set_priority because it expects Java
1026 // priorities and we are *explicitly* using OS priorities so that it's
1027 // possible to set the compiler thread priority higher than any Java
1028 // thread.
1029
1030 int native_prio = CompilerThreadPriority;
1031 if (native_prio == -1) {
1032 if (UseCriticalCompilerThreadPriority) {
1033 native_prio = os::java_to_os_priority[CriticalPriority];
1034 } else {
1035 native_prio = os::java_to_os_priority[NearMaxPriority];
1036 }
1037 }
1038 os::set_native_priority(compiler_thread, native_prio);
1039
1040 java_lang_Thread::set_daemon(thread_oop());
1041
1042 compiler_thread->set_threadObj(thread_oop());
1043 compiler_thread->set_compiler(comp);
1044 Threads::add(compiler_thread);
1045 Thread::start(compiler_thread);
1046 }
1047
1048 // Let go of Threads_lock before yielding
1049 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1050
1051 return compiler_thread;
1052 }
1053
1054
1055 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1056 EXCEPTION_MARK;
1057 #if !defined(ZERO) && !defined(SHARK)
1058 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1059 #endif // !ZERO && !SHARK
1060 // Initialize the compilation queue
1061 if (c2_compiler_count > 0) {
1062 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1063 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1064 }
1065 if (c1_compiler_count > 0) {
1066 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1067 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1068 }
1069
1070 int compiler_count = c1_compiler_count + c2_compiler_count;
1071
1072 _compiler_threads =
1073 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1074
1075 char name_buffer[256];
1076 for (int i = 0; i < c2_compiler_count; i++) {
1077 // Create a name for our thread.
1078 sprintf(name_buffer, "C2 CompilerThread%d", i);
1079 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1080 // Shark and C2
1081 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1082 _compiler_threads->append(new_thread);
1083 }
1084
1085 for (int i = c2_compiler_count; i < compiler_count; i++) {
1086 // Create a name for our thread.
1087 sprintf(name_buffer, "C1 CompilerThread%d", i);
1088 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1089 // C1
1090 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1091 _compiler_threads->append(new_thread);
1092 }
1093
1094 if (UsePerfData) {
1095 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1096 }
1097 }
1098
1099
1100 /**
1101 * Set the methods on the stack as on_stack so that redefine classes doesn't
1102 * reclaim them. This method is executed at a safepoint.
1103 */
1104 void CompileBroker::mark_on_stack() {
1105 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1106 // Since we are at a safepoint, we do not need a lock to access
1107 // the compile queues.
1108 if (_c2_compile_queue != NULL) {
1109 _c2_compile_queue->mark_on_stack();
1110 }
1111 if (_c1_compile_queue != NULL) {
1112 _c1_compile_queue->mark_on_stack();
1113 }
1114 }
1115
1116 // ------------------------------------------------------------------
1117 // CompileBroker::compile_method
1118 //
1119 // Request compilation of a method.
1120 void CompileBroker::compile_method_base(methodHandle method,
1121 int osr_bci,
1122 int comp_level,
1123 methodHandle hot_method,
1124 int hot_count,
1125 const char* comment,
1126 Thread* thread) {
1127 // do nothing if compiler thread(s) is not available
1128 if (!_initialized) {
1129 return;
1130 }
1131
1132 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1133 assert(method->method_holder()->oop_is_instance(),
1134 "sanity check");
1135 assert(!method->method_holder()->is_not_initialized(),
1136 "method holder must be initialized");
1137 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1138
1139 if (CIPrintRequests) {
1140 tty->print("request: ");
1141 method->print_short_name(tty);
1142 if (osr_bci != InvocationEntryBci) {
1143 tty->print(" osr_bci: %d", osr_bci);
1144 }
1145 tty->print(" comment: %s count: %d", comment, hot_count);
1146 if (!hot_method.is_null()) {
1147 tty->print(" hot: ");
1148 if (hot_method() != method()) {
1149 hot_method->print_short_name(tty);
1150 } else {
1151 tty->print("yes");
1152 }
1153 }
1154 tty->cr();
1155 }
1156
1157 // A request has been made for compilation. Before we do any
1158 // real work, check to see if the method has been compiled
1159 // in the meantime with a definitive result.
1160 if (compilation_is_complete(method, osr_bci, comp_level)) {
1161 return;
1162 }
1163
1164 #ifndef PRODUCT
1165 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1166 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1167 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1168 return;
1169 }
1170 }
1171 #endif
1172
1173 // If this method is already in the compile queue, then
1174 // we do not block the current thread.
1175 if (compilation_is_in_queue(method)) {
1176 // We may want to decay our counter a bit here to prevent
1177 // multiple denied requests for compilation. This is an
1178 // open compilation policy issue. Note: The other possibility,
1179 // in the case that this is a blocking compile request, is to have
1180 // all subsequent blocking requesters wait for completion of
1181 // ongoing compiles. Note that in this case we'll need a protocol
1182 // for freeing the associated compile tasks. [Or we could have
1183 // a single static monitor on which all these waiters sleep.]
1184 return;
1185 }
1186
1187 // If the requesting thread is holding the pending list lock
1188 // then we just return. We can't risk blocking while holding
1189 // the pending list lock or a 3-way deadlock may occur
1190 // between the reference handler thread, a GC (instigated
1191 // by a compiler thread), and compiled method registration.
1192 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1193 return;
1194 }
1195
1196 // Outputs from the following MutexLocker block:
1197 CompileTask* task = NULL;
1198 bool blocking = false;
1199 CompileQueue* queue = compile_queue(comp_level);
1200
1201 // Acquire our lock.
1202 {
1203 MutexLocker locker(queue->lock(), thread);
1204
1205 // Make sure the method has not slipped into the queues since
1206 // last we checked; note that those checks were "fast bail-outs".
1207 // Here we need to be more careful, see 14012000 below.
1208 if (compilation_is_in_queue(method)) {
1209 return;
1210 }
1211
1212 // We need to check again to see if the compilation has
1213 // completed. A previous compilation may have registered
1214 // some result.
1215 if (compilation_is_complete(method, osr_bci, comp_level)) {
1216 return;
1217 }
1218
1219 // We now know that this compilation is not pending, complete,
1220 // or prohibited. Assign a compile_id to this compilation
1221 // and check to see if it is in our [Start..Stop) range.
1222 int compile_id = assign_compile_id(method, osr_bci);
1223 if (compile_id == 0) {
1224 // The compilation falls outside the allowed range.
1225 return;
1226 }
1227
1228 // Should this thread wait for completion of the compile?
1229 blocking = is_compile_blocking();
1230
1231 // We will enter the compilation in the queue.
1232 // 14012000: Note that this sets the queued_for_compile bits in
1233 // the target method. We can now reason that a method cannot be
1234 // queued for compilation more than once, as follows:
1235 // Before a thread queues a task for compilation, it first acquires
1236 // the compile queue lock, then checks if the method's queued bits
1237 // are set or it has already been compiled. Thus there can not be two
1238 // instances of a compilation task for the same method on the
1239 // compilation queue. Consider now the case where the compilation
1240 // thread has already removed a task for that method from the queue
1241 // and is in the midst of compiling it. In this case, the
1242 // queued_for_compile bits must be set in the method (and these
1243 // will be visible to the current thread, since the bits were set
1244 // under protection of the compile queue lock, which we hold now.
1245 // When the compilation completes, the compiler thread first sets
1246 // the compilation result and then clears the queued_for_compile
1247 // bits. Neither of these actions are protected by a barrier (or done
1248 // under the protection of a lock), so the only guarantee we have
1249 // (on machines with TSO (Total Store Order)) is that these values
1250 // will update in that order. As a result, the only combinations of
1251 // these bits that the current thread will see are, in temporal order:
1252 // <RESULT, QUEUE> :
1253 // <0, 1> : in compile queue, but not yet compiled
1254 // <1, 1> : compiled but queue bit not cleared
1255 // <1, 0> : compiled and queue bit cleared
1256 // Because we first check the queue bits then check the result bits,
1257 // we are assured that we cannot introduce a duplicate task.
1258 // Note that if we did the tests in the reverse order (i.e. check
1259 // result then check queued bit), we could get the result bit before
1260 // the compilation completed, and the queue bit after the compilation
1261 // completed, and end up introducing a "duplicate" (redundant) task.
1262 // In that case, the compiler thread should first check if a method
1263 // has already been compiled before trying to compile it.
1264 // NOTE: in the event that there are multiple compiler threads and
1265 // there is de-optimization/recompilation, things will get hairy,
1266 // and in that case it's best to protect both the testing (here) of
1267 // these bits, and their updating (here and elsewhere) under a
1268 // common lock.
1269 task = create_compile_task(queue,
1270 compile_id, method,
1271 osr_bci, comp_level,
1272 hot_method, hot_count, comment,
1273 blocking);
1274 }
1275
1276 if (blocking) {
1277 wait_for_completion(task);
1278 }
1279 }
1280
1281
1282 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1283 int comp_level,
1284 methodHandle hot_method, int hot_count,
1285 const char* comment, Thread* THREAD) {
1286 // make sure arguments make sense
1287 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1288 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1289 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1290 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1291 // allow any levels for WhiteBox
1292 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1293 // return quickly if possible
1294
1295 // lock, make sure that the compilation
1296 // isn't prohibited in a straightforward way.
1297 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1298 if (comp == NULL || !comp->can_compile_method(method) ||
1299 compilation_is_prohibited(method, osr_bci, comp_level)) {
1300 return NULL;
1301 }
1302
1303 if (osr_bci == InvocationEntryBci) {
1304 // standard compilation
1305 nmethod* method_code = method->code();
1306 if (method_code != NULL) {
1307 if (compilation_is_complete(method, osr_bci, comp_level)) {
1308 return method_code;
1309 }
1310 }
1311 if (method->is_not_compilable(comp_level)) {
1312 return NULL;
1313 }
1314 } else {
1315 // osr compilation
1316 #ifndef TIERED
1317 // seems like an assert of dubious value
1318 assert(comp_level == CompLevel_highest_tier,
1319 "all OSR compiles are assumed to be at a single compilation lavel");
1320 #endif // TIERED
1321 // We accept a higher level osr method
1322 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1323 if (nm != NULL) return nm;
1324 if (method->is_not_osr_compilable(comp_level)) return NULL;
1325 }
1326
1327 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1328 // some prerequisites that are compiler specific
1329 if (comp->is_c2() || comp->is_shark()) {
1330 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1331 // Resolve all classes seen in the signature of the method
1332 // we are compiling.
1333 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1334 }
1335
1336 // If the method is native, do the lookup in the thread requesting
1337 // the compilation. Native lookups can load code, which is not
1338 // permitted during compilation.
1339 //
1340 // Note: A native method implies non-osr compilation which is
1341 // checked with an assertion at the entry of this method.
1342 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1343 bool in_base_library;
1344 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1345 if (HAS_PENDING_EXCEPTION) {
1346 // In case of an exception looking up the method, we just forget
1347 // about it. The interpreter will kick-in and throw the exception.
1348 method->set_not_compilable(); // implies is_not_osr_compilable()
1349 CLEAR_PENDING_EXCEPTION;
1350 return NULL;
1351 }
1352 assert(method->has_native_function(), "must have native code by now");
1353 }
1354
1355 // RedefineClasses() has replaced this method; just return
1356 if (method->is_old()) {
1357 return NULL;
1358 }
1359
1360 // JVMTI -- post_compile_event requires jmethod_id() that may require
1361 // a lock the compiling thread can not acquire. Prefetch it here.
1362 if (JvmtiExport::should_post_compiled_method_load()) {
1363 method->jmethod_id();
1364 }
1365
1366 // do the compilation
1367 if (method->is_native()) {
1368 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1369 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1370 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1371 //
1372 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1373 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1374 AdapterHandlerLibrary::create_native_wrapper(method);
1375 } else {
1376 return NULL;
1377 }
1378 } else {
1379 // If the compiler is shut off due to code cache getting full
1380 // fail out now so blocking compiles dont hang the java thread
1381 if (!should_compile_new_jobs()) {
1382 CompilationPolicy::policy()->delay_compilation(method());
1383 return NULL;
1384 }
1385 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1386 }
1387
1388 // return requested nmethod
1389 // We accept a higher level osr method
1390 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1391 }
1392
1393
1394 // ------------------------------------------------------------------
1395 // CompileBroker::compilation_is_complete
1396 //
1397 // See if compilation of this method is already complete.
1398 bool CompileBroker::compilation_is_complete(methodHandle method,
1399 int osr_bci,
1400 int comp_level) {
1401 bool is_osr = (osr_bci != standard_entry_bci);
1402 if (is_osr) {
1403 if (method->is_not_osr_compilable(comp_level)) {
1404 return true;
1405 } else {
1406 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1407 return (result != NULL);
1408 }
1409 } else {
1410 if (method->is_not_compilable(comp_level)) {
1411 return true;
1412 } else {
1413 nmethod* result = method->code();
1414 if (result == NULL) return false;
1415 return comp_level == result->comp_level();
1416 }
1417 }
1418 }
1419
1420
1421 /**
1422 * See if this compilation is already requested.
1423 *
1424 * Implementation note: there is only a single "is in queue" bit
1425 * for each method. This means that the check below is overly
1426 * conservative in the sense that an osr compilation in the queue
1427 * will block a normal compilation from entering the queue (and vice
1428 * versa). This can be remedied by a full queue search to disambiguate
1429 * cases. If it is deemed profitable, this may be done.
1430 */
1431 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1432 return method->queued_for_compilation();
1433 }
1434
1435 // ------------------------------------------------------------------
1436 // CompileBroker::compilation_is_prohibited
1437 //
1438 // See if this compilation is not allowed.
1439 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1440 bool is_native = method->is_native();
1441 // Some compilers may not support the compilation of natives.
1442 AbstractCompiler *comp = compiler(comp_level);
1443 if (is_native &&
1444 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1445 method->set_not_compilable_quietly(comp_level);
1446 return true;
1447 }
1448
1449 bool is_osr = (osr_bci != standard_entry_bci);
1450 // Some compilers may not support on stack replacement.
1451 if (is_osr &&
1452 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1453 method->set_not_osr_compilable(comp_level);
1454 return true;
1455 }
1456
1457 // The method may be explicitly excluded by the user.
1458 bool quietly;
1459 if (CompilerOracle::should_exclude(method, quietly)) {
1460 if (!quietly) {
1461 // This does not happen quietly...
1462 ResourceMark rm;
1463 tty->print("### Excluding %s:%s",
1464 method->is_native() ? "generation of native wrapper" : "compile",
1465 (method->is_static() ? " static" : ""));
1466 method->print_short_name(tty);
1467 tty->cr();
1468 }
1469 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1470 }
1471
1472 return false;
1473 }
1474
1475 /**
1476 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1477 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1478 * The function also allows to generate separate compilation IDs for OSR compilations.
1479 */
1480 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1481 #ifdef ASSERT
1482 bool is_osr = (osr_bci != standard_entry_bci);
1483 int id;
1484 if (method->is_native()) {
1485 assert(!is_osr, "can't be osr");
1486 // Adapters, native wrappers and method handle intrinsics
1487 // should be generated always.
1488 return Atomic::add(1, &_compilation_id);
1489 } else if (CICountOSR && is_osr) {
1490 id = Atomic::add(1, &_osr_compilation_id);
1491 if (CIStartOSR <= id && id < CIStopOSR) {
1492 return id;
1493 }
1494 } else {
1495 id = Atomic::add(1, &_compilation_id);
1496 if (CIStart <= id && id < CIStop) {
1497 return id;
1498 }
1499 }
1500
1501 // Method was not in the appropriate compilation range.
1502 method->set_not_compilable_quietly();
1503 return 0;
1504 #else
1505 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1506 // only _compilation_id is incremented.
1507 return Atomic::add(1, &_compilation_id);
1508 #endif
1509 }
1510
1511 /**
1512 * Should the current thread block until this compilation request
1513 * has been fulfilled?
1514 */
1515 bool CompileBroker::is_compile_blocking() {
1516 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1517 return !BackgroundCompilation;
1518 }
1519
1520
1521 // ------------------------------------------------------------------
1522 // CompileBroker::preload_classes
1523 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1524 // Move this code over from c1_Compiler.cpp
1525 ShouldNotReachHere();
1526 }
1527
1528
1529 // ------------------------------------------------------------------
1530 // CompileBroker::create_compile_task
1531 //
1532 // Create a CompileTask object representing the current request for
1533 // compilation. Add this task to the queue.
1534 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1535 int compile_id,
1536 methodHandle method,
1537 int osr_bci,
1538 int comp_level,
1539 methodHandle hot_method,
1540 int hot_count,
1541 const char* comment,
1542 bool blocking) {
1543 CompileTask* new_task = CompileTask::allocate();
1544 new_task->initialize(compile_id, method, osr_bci, comp_level,
1545 hot_method, hot_count, comment,
1546 blocking);
1547 queue->add(new_task);
1548 return new_task;
1549 }
1550
1551
1552 /**
1553 * Wait for the compilation task to complete.
1554 */
1555 void CompileBroker::wait_for_completion(CompileTask* task) {
1556 if (CIPrintCompileQueue) {
1557 ttyLocker ttyl;
1558 tty->print_cr("BLOCKING FOR COMPILE");
1559 }
1560
1561 assert(task->is_blocking(), "can only wait on blocking task");
1562
1563 JavaThread* thread = JavaThread::current();
1564 thread->set_blocked_on_compilation(true);
1565
1566 methodHandle method(thread, task->method());
1567 {
1568 MutexLocker waiter(task->lock(), thread);
1569
1570 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1571 task->lock()->wait();
1572 }
1573 }
1574
1575 thread->set_blocked_on_compilation(false);
1576 if (is_compilation_disabled_forever()) {
1577 CompileTask::free(task);
1578 return;
1579 }
1580
1581 // It is harmless to check this status without the lock, because
1582 // completion is a stable property (until the task object is recycled).
1583 assert(task->is_complete(), "Compilation should have completed");
1584 assert(task->code_handle() == NULL, "must be reset");
1585
1586 // By convention, the waiter is responsible for recycling a
1587 // blocking CompileTask. Since there is only one waiter ever
1588 // waiting on a CompileTask, we know that no one else will
1589 // be using this CompileTask; we can free it.
1590 CompileTask::free(task);
1591 }
1592
1593 /**
1594 * Initialize compiler thread(s) + compiler object(s). The postcondition
1595 * of this function is that the compiler runtimes are initialized and that
1596 * compiler threads can start compiling.
1597 */
1598 bool CompileBroker::init_compiler_runtime() {
1599 CompilerThread* thread = CompilerThread::current();
1600 AbstractCompiler* comp = thread->compiler();
1601 // Final sanity check - the compiler object must exist
1602 guarantee(comp != NULL, "Compiler object must exist");
1603
1604 int system_dictionary_modification_counter;
1605 {
1606 MutexLocker locker(Compile_lock, thread);
1607 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1608 }
1609
1610 {
1611 // Must switch to native to allocate ci_env
1612 ThreadToNativeFromVM ttn(thread);
1613 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1614 // Cache Jvmti state
1615 ci_env.cache_jvmti_state();
1616 // Cache DTrace flags
1617 ci_env.cache_dtrace_flags();
1618
1619 // Switch back to VM state to do compiler initialization
1620 ThreadInVMfromNative tv(thread);
1621 ResetNoHandleMark rnhm;
1622
1623
1624 if (!comp->is_shark()) {
1625 // Perform per-thread and global initializations
1626 comp->initialize();
1627 }
1628 }
1629
1630 if (comp->is_failed()) {
1631 disable_compilation_forever();
1632 // If compiler initialization failed, no compiler thread that is specific to a
1633 // particular compiler runtime will ever start to compile methods.
1634 shutdown_compiler_runtime(comp, thread);
1635 return false;
1636 }
1637
1638 // C1 specific check
1639 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1640 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1641 return false;
1642 }
1643
1644 return true;
1645 }
1646
1647 /**
1648 * If C1 and/or C2 initialization failed, we shut down all compilation.
1649 * We do this to keep things simple. This can be changed if it ever turns
1650 * out to be a problem.
1651 */
1652 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1653 // Free buffer blob, if allocated
1654 if (thread->get_buffer_blob() != NULL) {
1655 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1656 CodeCache::free(thread->get_buffer_blob());
1657 }
1658
1659 if (comp->should_perform_shutdown()) {
1660 // There are two reasons for shutting down the compiler
1661 // 1) compiler runtime initialization failed
1662 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1663 warning("%s initialization failed. Shutting down all compilers", comp->name());
1664
1665 // Only one thread per compiler runtime object enters here
1666 // Set state to shut down
1667 comp->set_shut_down();
1668
1669 // Delete all queued compilation tasks to make compiler threads exit faster.
1670 if (_c1_compile_queue != NULL) {
1671 _c1_compile_queue->free_all();
1672 }
1673
1674 if (_c2_compile_queue != NULL) {
1675 _c2_compile_queue->free_all();
1676 }
1677
1678 // Set flags so that we continue execution with using interpreter only.
1679 UseCompiler = false;
1680 UseInterpreter = true;
1681
1682 // We could delete compiler runtimes also. However, there are references to
1683 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1684 // fail. This can be done later if necessary.
1685 }
1686 }
1687
1688 // ------------------------------------------------------------------
1689 // CompileBroker::compiler_thread_loop
1690 //
1691 // The main loop run by a CompilerThread.
1692 void CompileBroker::compiler_thread_loop() {
1693 CompilerThread* thread = CompilerThread::current();
1694 CompileQueue* queue = thread->queue();
1695 // For the thread that initializes the ciObjectFactory
1696 // this resource mark holds all the shared objects
1697 ResourceMark rm;
1698
1699 // First thread to get here will initialize the compiler interface
1700
1701 if (!ciObjectFactory::is_initialized()) {
1702 ASSERT_IN_VM;
1703 MutexLocker only_one (CompileThread_lock, thread);
1704 if (!ciObjectFactory::is_initialized()) {
1705 ciObjectFactory::initialize();
1706 }
1707 }
1708
1709 // Open a log.
1710 if (LogCompilation) {
1711 init_compiler_thread_log();
1712 }
1713 CompileLog* log = thread->log();
1714 if (log != NULL) {
1715 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1716 thread->name(),
1717 os::current_thread_id(),
1718 os::current_process_id());
1719 log->stamp();
1720 log->end_elem();
1721 }
1722
1723 // If compiler thread/runtime initialization fails, exit the compiler thread
1724 if (!init_compiler_runtime()) {
1725 return;
1726 }
1727
1728 // Poll for new compilation tasks as long as the JVM runs. Compilation
1729 // should only be disabled if something went wrong while initializing the
1730 // compiler runtimes. This, in turn, should not happen. The only known case
1731 // when compiler runtime initialization fails is if there is not enough free
1732 // space in the code cache to generate the necessary stubs, etc.
1733 while (!is_compilation_disabled_forever()) {
1734 // We need this HandleMark to avoid leaking VM handles.
1735 HandleMark hm(thread);
1736
1737 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1738 // the code cache is really full
1739 handle_full_code_cache();
1740 }
1741
1742 CompileTask* task = queue->get();
1743 if (task == NULL) {
1744 continue;
1745 }
1746
1747 // Give compiler threads an extra quanta. They tend to be bursty and
1748 // this helps the compiler to finish up the job.
1749 if( CompilerThreadHintNoPreempt )
1750 os::hint_no_preempt();
1751
1752 // trace per thread time and compile statistics
1753 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1754 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1755
1756 // Assign the task to the current thread. Mark this compilation
1757 // thread as active for the profiler.
1758 CompileTaskWrapper ctw(task);
1759 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1760 task->set_code_handle(&result_handle);
1761 methodHandle method(thread, task->method());
1762
1763 // Never compile a method if breakpoints are present in it
1764 if (method()->number_of_breakpoints() == 0) {
1765 // Compile the method.
1766 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1767 #ifdef COMPILER1
1768 // Allow repeating compilations for the purpose of benchmarking
1769 // compile speed. This is not useful for customers.
1770 if (CompilationRepeat != 0) {
1771 int compile_count = CompilationRepeat;
1772 while (compile_count > 0) {
1773 invoke_compiler_on_method(task);
1774 nmethod* nm = method->code();
1775 if (nm != NULL) {
1776 nm->make_zombie();
1777 method->clear_code();
1778 }
1779 compile_count--;
1780 }
1781 }
1782 #endif /* COMPILER1 */
1783 invoke_compiler_on_method(task);
1784 } else {
1785 // After compilation is disabled, remove remaining methods from queue
1786 method->clear_queued_for_compilation();
1787 }
1788 }
1789 }
1790
1791 // Shut down compiler runtime
1792 shutdown_compiler_runtime(thread->compiler(), thread);
1793 }
1794
1795 // ------------------------------------------------------------------
1796 // CompileBroker::init_compiler_thread_log
1797 //
1798 // Set up state required by +LogCompilation.
1799 void CompileBroker::init_compiler_thread_log() {
1800 CompilerThread* thread = CompilerThread::current();
1801 char file_name[4*K];
1802 FILE* fp = NULL;
1803 intx thread_id = os::current_thread_id();
1804 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1805 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1806 if (dir == NULL) {
1807 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1808 thread_id, os::current_process_id());
1809 } else {
1810 jio_snprintf(file_name, sizeof(file_name),
1811 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1812 os::file_separator(), thread_id, os::current_process_id());
1813 }
1814
1815 fp = fopen(file_name, "at");
1816 if (fp != NULL) {
1817 if (LogCompilation && Verbose) {
1818 tty->print_cr("Opening compilation log %s", file_name);
1819 }
1820 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1821 thread->init_log(log);
1822
1823 if (xtty != NULL) {
1824 ttyLocker ttyl;
1825 // Record any per thread log files
1826 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name);
1827 }
1828 return;
1829 }
1830 }
1831 warning("Cannot open log file: %s", file_name);
1832 }
1833
1834 // ------------------------------------------------------------------
1835 // CompileBroker::set_should_block
1836 //
1837 // Set _should_block.
1838 // Call this from the VM, with Threads_lock held and a safepoint requested.
1839 void CompileBroker::set_should_block() {
1840 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1841 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1842 #ifndef PRODUCT
1843 if (PrintCompilation && (Verbose || WizardMode))
1844 tty->print_cr("notifying compiler thread pool to block");
1845 #endif
1846 _should_block = true;
1847 }
1848
1849 // ------------------------------------------------------------------
1850 // CompileBroker::maybe_block
1851 //
1852 // Call this from the compiler at convenient points, to poll for _should_block.
1853 void CompileBroker::maybe_block() {
1854 if (_should_block) {
1855 #ifndef PRODUCT
1856 if (PrintCompilation && (Verbose || WizardMode))
1857 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1858 #endif
1859 ThreadInVMfromNative tivfn(JavaThread::current());
1860 }
1861 }
1862
1863 // wrapper for CodeCache::print_summary()
1864 static void codecache_print(bool detailed)
1865 {
1866 ResourceMark rm;
1867 stringStream s;
1868 // Dump code cache into a buffer before locking the tty,
1869 {
1870 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1871 CodeCache::print_summary(&s, detailed);
1872 }
1873 ttyLocker ttyl;
1874 tty->print(s.as_string());
1875 }
1876
1877 // ------------------------------------------------------------------
1878 // CompileBroker::invoke_compiler_on_method
1879 //
1880 // Compile a method.
1881 //
1882 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1883 if (PrintCompilation) {
1884 ResourceMark rm;
1885 task->print_line();
1886 }
1887 elapsedTimer time;
1888
1889 CompilerThread* thread = CompilerThread::current();
1890 ResourceMark rm(thread);
1891
1892 if (LogEvents) {
1893 _compilation_log->log_compile(thread, task);
1894 }
1895
1896 // Common flags.
1897 uint compile_id = task->compile_id();
1898 int osr_bci = task->osr_bci();
1899 bool is_osr = (osr_bci != standard_entry_bci);
1900 bool should_log = (thread->log() != NULL);
1901 bool should_break = false;
1902 int task_level = task->comp_level();
1903 {
1904 // create the handle inside it's own block so it can't
1905 // accidentally be referenced once the thread transitions to
1906 // native. The NoHandleMark before the transition should catch
1907 // any cases where this occurs in the future.
1908 methodHandle method(thread, task->method());
1909 should_break = check_break_at(method, compile_id, is_osr);
1910 if (should_log && !CompilerOracle::should_log(method)) {
1911 should_log = false;
1912 }
1913 assert(!method->is_native(), "no longer compile natives");
1914
1915 // Save information about this method in case of failure.
1916 set_last_compile(thread, method, is_osr, task_level);
1917
1918 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1919 }
1920
1921 // Allocate a new set of JNI handles.
1922 push_jni_handle_block();
1923 Method* target_handle = task->method();
1924 int compilable = ciEnv::MethodCompilable;
1925 {
1926 int system_dictionary_modification_counter;
1927 {
1928 MutexLocker locker(Compile_lock, thread);
1929 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1930 }
1931
1932 NoHandleMark nhm;
1933 ThreadToNativeFromVM ttn(thread);
1934
1935 ciEnv ci_env(task, system_dictionary_modification_counter);
1936 if (should_break) {
1937 ci_env.set_break_at_compile(true);
1938 }
1939 if (should_log) {
1940 ci_env.set_log(thread->log());
1941 }
1942 assert(thread->env() == &ci_env, "set by ci_env");
1943 // The thread-env() field is cleared in ~CompileTaskWrapper.
1944
1945 // Cache Jvmti state
1946 ci_env.cache_jvmti_state();
1947
1948 // Cache DTrace flags
1949 ci_env.cache_dtrace_flags();
1950
1951 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1952
1953 TraceTime t1("compilation", &time);
1954 EventCompilation event;
1955
1956 AbstractCompiler *comp = compiler(task_level);
1957 if (comp == NULL) {
1958 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1959 } else {
1960 comp->compile_method(&ci_env, target, osr_bci);
1961 }
1962
1963 if (!ci_env.failing() && task->code() == NULL) {
1964 //assert(false, "compiler should always document failure");
1965 // The compiler elected, without comment, not to register a result.
1966 // Do not attempt further compilations of this method.
1967 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1968 }
1969
1970 // Copy this bit to the enclosing block:
1971 compilable = ci_env.compilable();
1972
1973 if (ci_env.failing()) {
1974 const char* retry_message = ci_env.retry_message();
1975 if (_compilation_log != NULL) {
1976 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1977 }
1978 if (PrintCompilation) {
1979 FormatBufferResource msg = retry_message != NULL ?
1980 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1981 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
1982 task->print_compilation(tty, msg);
1983 }
1984 } else {
1985 task->mark_success();
1986 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1987 if (_compilation_log != NULL) {
1988 nmethod* code = task->code();
1989 if (code != NULL) {
1990 _compilation_log->log_nmethod(thread, code);
1991 }
1992 }
1993 }
1994 // simulate crash during compilation
1995 assert(task->compile_id() != CICrashAt, "just as planned");
1996 if (event.should_commit()) {
1997 event.set_method(target->get_Method());
1998 event.set_compileID(compile_id);
1999 event.set_compileLevel(task->comp_level());
2000 event.set_succeded(task->is_success());
2001 event.set_isOsr(is_osr);
2002 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2003 event.set_inlinedBytes(task->num_inlined_bytecodes());
2004 event.commit();
2005 }
2006 }
2007 pop_jni_handle_block();
2008
2009 methodHandle method(thread, task->method());
2010
2011 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2012
2013 collect_statistics(thread, time, task);
2014
2015 if (PrintCompilation && PrintCompilation2) {
2016 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2017 tty->print("%4d ", compile_id); // print compilation number
2018 tty->print("%s ", (is_osr ? "%" : " "));
2019 if (task->code() != NULL) {
2020 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2021 }
2022 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2023 }
2024
2025 if (PrintCodeCacheOnCompilation)
2026 codecache_print(/* detailed= */ false);
2027
2028 // Disable compilation, if required.
2029 switch (compilable) {
2030 case ciEnv::MethodCompilable_never:
2031 if (is_osr)
2032 method->set_not_osr_compilable_quietly();
2033 else
2034 method->set_not_compilable_quietly();
2035 break;
2036 case ciEnv::MethodCompilable_not_at_tier:
2037 if (is_osr)
2038 method->set_not_osr_compilable_quietly(task_level);
2039 else
2040 method->set_not_compilable_quietly(task_level);
2041 break;
2042 }
2043
2044 // Note that the queued_for_compilation bits are cleared without
2045 // protection of a mutex. [They were set by the requester thread,
2046 // when adding the task to the compile queue -- at which time the
2047 // compile queue lock was held. Subsequently, we acquired the compile
2048 // queue lock to get this task off the compile queue; thus (to belabour
2049 // the point somewhat) our clearing of the bits must be occurring
2050 // only after the setting of the bits. See also 14012000 above.
2051 method->clear_queued_for_compilation();
2052
2053 #ifdef ASSERT
2054 if (CollectedHeap::fired_fake_oom()) {
2055 // The current compile received a fake OOM during compilation so
2056 // go ahead and exit the VM since the test apparently succeeded
2057 tty->print_cr("*** Shutting down VM after successful fake OOM");
2058 vm_exit(0);
2059 }
2060 #endif
2061 }
2062
2063 /**
2064 * The CodeCache is full. Print out warning and disable compilation
2065 * or try code cache cleaning so compilation can continue later.
2066 */
2067 void CompileBroker::handle_full_code_cache() {
2068 UseInterpreter = true;
2069 if (UseCompiler || AlwaysCompileLoopMethods ) {
2070 if (xtty != NULL) {
2071 ResourceMark rm;
2072 stringStream s;
2073 // Dump code cache state into a buffer before locking the tty,
2074 // because log_state() will use locks causing lock conflicts.
2075 CodeCache::log_state(&s);
2076 // Lock to prevent tearing
2077 ttyLocker ttyl;
2078 xtty->begin_elem("code_cache_full");
2079 xtty->print(s.as_string());
2080 xtty->stamp();
2081 xtty->end_elem();
2082 }
2083
2084 CodeCache::report_codemem_full();
2085
2086 #ifndef PRODUCT
2087 if (CompileTheWorld || ExitOnFullCodeCache) {
2088 codecache_print(/* detailed= */ true);
2089 before_exit(JavaThread::current());
2090 exit_globals(); // will delete tty
2091 vm_direct_exit(CompileTheWorld ? 0 : 1);
2092 }
2093 #endif
2094 if (UseCodeCacheFlushing) {
2095 // Since code cache is full, immediately stop new compiles
2096 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2097 NMethodSweeper::log_sweep("disable_compiler");
2098 }
2099 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2100 // without having to consider the state in which the current thread is.
2101 ThreadInVMfromUnknown in_vm;
2102 NMethodSweeper::possibly_sweep();
2103 } else {
2104 disable_compilation_forever();
2105 }
2106
2107 // Print warning only once
2108 if (should_print_compiler_warning()) {
2109 warning("CodeCache is full. Compiler has been disabled.");
2110 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2111 codecache_print(/* detailed= */ true);
2112 }
2113 }
2114 }
2115
2116 // ------------------------------------------------------------------
2117 // CompileBroker::set_last_compile
2118 //
2119 // Record this compilation for debugging purposes.
2120 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2121 ResourceMark rm;
2122 char* method_name = method->name()->as_C_string();
2123 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2124 char current_method[CompilerCounters::cmname_buffer_length];
2125 size_t maxLen = CompilerCounters::cmname_buffer_length;
2126
2127 if (UsePerfData) {
2128 const char* class_name = method->method_holder()->name()->as_C_string();
2129
2130 size_t s1len = strlen(class_name);
2131 size_t s2len = strlen(method_name);
2132
2133 // check if we need to truncate the string
2134 if (s1len + s2len + 2 > maxLen) {
2135
2136 // the strategy is to lop off the leading characters of the
2137 // class name and the trailing characters of the method name.
2138
2139 if (s2len + 2 > maxLen) {
2140 // lop of the entire class name string, let snprintf handle
2141 // truncation of the method name.
2142 class_name += s1len; // null string
2143 }
2144 else {
2145 // lop off the extra characters from the front of the class name
2146 class_name += ((s1len + s2len + 2) - maxLen);
2147 }
2148 }
2149
2150 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2151 }
2152
2153 if (CICountOSR && is_osr) {
2154 _last_compile_type = osr_compile;
2155 } else {
2156 _last_compile_type = normal_compile;
2157 }
2158 _last_compile_level = comp_level;
2159
2160 if (UsePerfData) {
2161 CompilerCounters* counters = thread->counters();
2162 counters->set_current_method(current_method);
2163 counters->set_compile_type((jlong)_last_compile_type);
2164 }
2165 }
2166
2167
2168 // ------------------------------------------------------------------
2169 // CompileBroker::push_jni_handle_block
2170 //
2171 // Push on a new block of JNI handles.
2172 void CompileBroker::push_jni_handle_block() {
2173 JavaThread* thread = JavaThread::current();
2174
2175 // Allocate a new block for JNI handles.
2176 // Inlined code from jni_PushLocalFrame()
2177 JNIHandleBlock* java_handles = thread->active_handles();
2178 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2179 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2180 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2181 thread->set_active_handles(compile_handles);
2182 }
2183
2184
2185 // ------------------------------------------------------------------
2186 // CompileBroker::pop_jni_handle_block
2187 //
2188 // Pop off the current block of JNI handles.
2189 void CompileBroker::pop_jni_handle_block() {
2190 JavaThread* thread = JavaThread::current();
2191
2192 // Release our JNI handle block
2193 JNIHandleBlock* compile_handles = thread->active_handles();
2194 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2195 thread->set_active_handles(java_handles);
2196 compile_handles->set_pop_frame_link(NULL);
2197 JNIHandleBlock::release_block(compile_handles, thread); // may block
2198 }
2199
2200
2201 // ------------------------------------------------------------------
2202 // CompileBroker::check_break_at
2203 //
2204 // Should the compilation break at the current compilation.
2205 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2206 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2207 return true;
2208 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2209 return true;
2210 } else {
2211 return (compile_id == CIBreakAt);
2212 }
2213 }
2214
2215 // ------------------------------------------------------------------
2216 // CompileBroker::collect_statistics
2217 //
2218 // Collect statistics about the compilation.
2219
2220 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2221 bool success = task->is_success();
2222 methodHandle method (thread, task->method());
2223 uint compile_id = task->compile_id();
2224 bool is_osr = (task->osr_bci() != standard_entry_bci);
2225 nmethod* code = task->code();
2226 CompilerCounters* counters = thread->counters();
2227
2228 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2229 MutexLocker locker(CompileStatistics_lock);
2230
2231 // _perf variables are production performance counters which are
2232 // updated regardless of the setting of the CITime and CITimeEach flags
2233 //
2234 if (!success) {
2235 _total_bailout_count++;
2236 if (UsePerfData) {
2237 _perf_last_failed_method->set_value(counters->current_method());
2238 _perf_last_failed_type->set_value(counters->compile_type());
2239 _perf_total_bailout_count->inc();
2240 }
2241 } else if (code == NULL) {
2242 if (UsePerfData) {
2243 _perf_last_invalidated_method->set_value(counters->current_method());
2244 _perf_last_invalidated_type->set_value(counters->compile_type());
2245 _perf_total_invalidated_count->inc();
2246 }
2247 _total_invalidated_count++;
2248 } else {
2249 // Compilation succeeded
2250
2251 // update compilation ticks - used by the implementation of
2252 // java.lang.management.CompilationMBean
2253 _perf_total_compilation->inc(time.ticks());
2254
2255 _t_total_compilation.add(time);
2256 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2257
2258 if (CITime) {
2259 if (is_osr) {
2260 _t_osr_compilation.add(time);
2261 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2262 } else {
2263 _t_standard_compilation.add(time);
2264 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2265 }
2266 }
2267
2268 if (UsePerfData) {
2269 // save the name of the last method compiled
2270 _perf_last_method->set_value(counters->current_method());
2271 _perf_last_compile_type->set_value(counters->compile_type());
2272 _perf_last_compile_size->set_value(method->code_size() +
2273 task->num_inlined_bytecodes());
2274 if (is_osr) {
2275 _perf_osr_compilation->inc(time.ticks());
2276 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2277 } else {
2278 _perf_standard_compilation->inc(time.ticks());
2279 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2280 }
2281 }
2282
2283 if (CITimeEach) {
2284 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2285 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2286 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2287 }
2288
2289 // Collect counts of successful compilations
2290 _sum_nmethod_size += code->total_size();
2291 _sum_nmethod_code_size += code->insts_size();
2292 _total_compile_count++;
2293
2294 if (UsePerfData) {
2295 _perf_sum_nmethod_size->inc( code->total_size());
2296 _perf_sum_nmethod_code_size->inc(code->insts_size());
2297 _perf_total_compile_count->inc();
2298 }
2299
2300 if (is_osr) {
2301 if (UsePerfData) _perf_total_osr_compile_count->inc();
2302 _total_osr_compile_count++;
2303 } else {
2304 if (UsePerfData) _perf_total_standard_compile_count->inc();
2305 _total_standard_compile_count++;
2306 }
2307 }
2308 // set the current method for the thread to null
2309 if (UsePerfData) counters->set_current_method("");
2310 }
2311
2312 const char* CompileBroker::compiler_name(int comp_level) {
2313 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2314 if (comp == NULL) {
2315 return "no compiler";
2316 } else {
2317 return (comp->name());
2318 }
2319 }
2320
2321 void CompileBroker::print_times() {
2322 tty->cr();
2323 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2324 tty->print_cr("------------------------------------------------");
2325 //0000000000111111111122222222223333333333444444444455555555556666666666
2326 //0123456789012345678901234567890123456789012345678901234567890123456789
2327 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2328 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2329 CompileBroker::_t_standard_compilation.seconds(),
2330 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2331 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);
2332
2333 AbstractCompiler *comp = compiler(CompLevel_simple);
2334 if (comp != NULL) {
2335 comp->print_timers();
2336 }
2337 comp = compiler(CompLevel_full_optimization);
2338 if (comp != NULL) {
2339 comp->print_timers();
2340 }
2341 tty->cr();
2342 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2343 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2344 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2345 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2346 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2347 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2348 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2349 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2350 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2351 tty->cr();
2352 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2353 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2354 }
2355
2356 // Debugging output for failure
2357 void CompileBroker::print_last_compile() {
2358 if ( _last_compile_level != CompLevel_none &&
2359 compiler(_last_compile_level) != NULL &&
2360 _last_method_compiled != NULL &&
2361 _last_compile_type != no_compile) {
2362 if (_last_compile_type == osr_compile) {
2363 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2364 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2365 } else {
2366 tty->print_cr("Last parse: %d+++(%d) %s",
2367 _compilation_id, _last_compile_level, _last_method_compiled);
2368 }
2369 }
2370 }
2371
2372
2373 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2374 #ifndef PRODUCT
2375 st->print_cr("Compiler thread printing unimplemented.");
2376 st->cr();
2377 #endif
2378 }