1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodData.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/atomic.inline.hpp"
40 #include "runtime/compilationPolicy.hpp"
41 #include "runtime/init.hpp"
42 #include "runtime/interfaceSupport.hpp"
43 #include "runtime/javaCalls.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/sweeper.hpp"
47 #include "trace/tracing.hpp"
48 #include "utilities/dtrace.hpp"
49 #include "utilities/events.hpp"
50 #ifdef COMPILER1
51 #include "c1/c1_Compiler.hpp"
52 #endif
53 #ifdef COMPILER2
54 #include "opto/c2compiler.hpp"
55 #endif
56 #ifdef SHARK
57 #include "shark/sharkCompiler.hpp"
58 #endif
59
60 #ifdef DTRACE_ENABLED
61
62 // Only bother with this argument setup if dtrace is available
63
64 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
65 { \
66 Symbol* klass_name = (method)->klass_name(); \
67 Symbol* name = (method)->name(); \
68 Symbol* signature = (method)->signature(); \
69 HOTSPOT_METHOD_COMPILE_BEGIN( \
70 (char *) comp_name, strlen(comp_name), \
71 (char *) klass_name->bytes(), klass_name->utf8_length(), \
72 (char *) name->bytes(), name->utf8_length(), \
73 (char *) signature->bytes(), signature->utf8_length()); \
74 }
75
76 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
77 { \
78 Symbol* klass_name = (method)->klass_name(); \
79 Symbol* name = (method)->name(); \
80 Symbol* signature = (method)->signature(); \
81 HOTSPOT_METHOD_COMPILE_END( \
82 (char *) comp_name, strlen(comp_name), \
83 (char *) klass_name->bytes(), klass_name->utf8_length(), \
84 (char *) name->bytes(), name->utf8_length(), \
85 (char *) signature->bytes(), signature->utf8_length(), (success)); \
86 }
87
88 #else // ndef DTRACE_ENABLED
89
90 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
91 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
92
93 #endif // ndef DTRACE_ENABLED
94
95 bool CompileBroker::_initialized = false;
96 volatile bool CompileBroker::_should_block = false;
97 volatile jint CompileBroker::_print_compilation_warning = 0;
98 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
99
100 // The installed compiler(s)
101 AbstractCompiler* CompileBroker::_compilers[2];
102
103 // These counters are used to assign an unique ID to each compilation.
104 volatile jint CompileBroker::_compilation_id = 0;
105 volatile jint CompileBroker::_osr_compilation_id = 0;
106
107 // Debugging information
108 int CompileBroker::_last_compile_type = no_compile;
109 int CompileBroker::_last_compile_level = CompLevel_none;
110 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
111
112 // Performance counters
113 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
114 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
115 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
116
117 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
118 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
119 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
121 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
122
123 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
124 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
125 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
126 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
127
128 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
129 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
130 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
131 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
132 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
133 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
134 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
135
136 // Timers and counters for generating statistics
137 elapsedTimer CompileBroker::_t_total_compilation;
138 elapsedTimer CompileBroker::_t_osr_compilation;
139 elapsedTimer CompileBroker::_t_standard_compilation;
140
141 int CompileBroker::_total_bailout_count = 0;
142 int CompileBroker::_total_invalidated_count = 0;
143 int CompileBroker::_total_compile_count = 0;
144 int CompileBroker::_total_osr_compile_count = 0;
145 int CompileBroker::_total_standard_compile_count = 0;
146
147 int CompileBroker::_sum_osr_bytes_compiled = 0;
148 int CompileBroker::_sum_standard_bytes_compiled = 0;
149 int CompileBroker::_sum_nmethod_size = 0;
150 int CompileBroker::_sum_nmethod_code_size = 0;
151
152 long CompileBroker::_peak_compilation_time = 0;
153
154 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
155 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
156
157 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
158
159
160 class CompilationLog : public StringEventLog {
161 public:
162 CompilationLog() : StringEventLog("Compilation events") {
163 }
164
165 void log_compile(JavaThread* thread, CompileTask* task) {
166 StringLogMessage lm;
167 stringStream sstr = lm.stream();
168 // msg.time_stamp().update_to(tty->time_stamp().ticks());
169 task->print_compilation(&sstr, NULL, true, false);
170 log(thread, "%s", (const char*)lm);
171 }
172
173 void log_nmethod(JavaThread* thread, nmethod* nm) {
174 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
175 nm->compile_id(), nm->is_osr_method() ? "%" : "",
176 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
177 }
178
179 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
180 StringLogMessage lm;
181 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
182 if (retry_message != NULL) {
183 lm.append(" (%s)", retry_message);
184 }
185 lm.print("\n");
186 log(thread, "%s", (const char*)lm);
187 }
188 };
189
190 static CompilationLog* _compilation_log = NULL;
191
192 void compileBroker_init() {
193 if (LogEvents) {
194 _compilation_log = new CompilationLog();
195 }
196 }
197
198 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
199 CompilerThread* thread = CompilerThread::current();
200 thread->set_task(task);
201 CompileLog* log = thread->log();
202 if (log != NULL) task->log_task_start(log);
203 }
204
205 CompileTaskWrapper::~CompileTaskWrapper() {
206 CompilerThread* thread = CompilerThread::current();
207 CompileTask* task = thread->task();
208 CompileLog* log = thread->log();
209 if (log != NULL) task->log_task_done(log);
210 thread->set_task(NULL);
211 task->set_code_handle(NULL);
212 thread->set_env(NULL);
213 if (task->is_blocking()) {
214 MutexLocker notifier(task->lock(), thread);
215 task->mark_complete();
216 // Notify the waiting thread that the compilation has completed.
217 task->lock()->notify_all();
218 } else {
219 task->mark_complete();
220
221 // By convention, the compiling thread is responsible for
222 // recycling a non-blocking CompileTask.
223 CompileTask::free(task);
224 }
225 }
226
227
228 CompileTask* CompileTask::_task_free_list = NULL;
229 #ifdef ASSERT
230 int CompileTask::_num_allocated_tasks = 0;
231 #endif
232 /**
233 * Allocate a CompileTask, from the free list if possible.
234 */
235 CompileTask* CompileTask::allocate() {
236 MutexLocker locker(CompileTaskAlloc_lock);
237 CompileTask* task = NULL;
238
239 if (_task_free_list != NULL) {
240 task = _task_free_list;
241 _task_free_list = task->next();
242 task->set_next(NULL);
243 } else {
244 task = new CompileTask();
245 DEBUG_ONLY(_num_allocated_tasks++;)
246 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
247 task->set_next(NULL);
248 task->set_is_free(true);
249 }
250 assert(task->is_free(), "Task must be free.");
251 task->set_is_free(false);
252 return task;
253 }
254
255
256 /**
257 * Add a task to the free list.
258 */
259 void CompileTask::free(CompileTask* task) {
260 MutexLocker locker(CompileTaskAlloc_lock);
261 if (!task->is_free()) {
262 task->set_code(NULL);
263 assert(!task->lock()->is_locked(), "Should not be locked when freed");
264 JNIHandles::destroy_global(task->_method_holder);
265 JNIHandles::destroy_global(task->_hot_method_holder);
266
267 task->set_is_free(true);
268 task->set_next(_task_free_list);
269 _task_free_list = task;
270 }
271 }
272
273 void CompileTask::initialize(int compile_id,
274 methodHandle method,
275 int osr_bci,
276 int comp_level,
277 methodHandle hot_method,
278 int hot_count,
279 const char* comment,
280 bool is_blocking) {
281 assert(!_lock->is_locked(), "bad locking");
282
283 _compile_id = compile_id;
284 _method = method();
285 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
286 _osr_bci = osr_bci;
287 _is_blocking = is_blocking;
288 _comp_level = comp_level;
289 _num_inlined_bytecodes = 0;
290
291 _is_complete = false;
292 _is_success = false;
293 _code_handle = NULL;
294
295 _hot_method = NULL;
296 _hot_method_holder = NULL;
297 _hot_count = hot_count;
298 _time_queued = 0; // tidy
299 _comment = comment;
300 _failure_reason = NULL;
301
302 if (LogCompilation) {
303 _time_queued = os::elapsed_counter();
304 if (hot_method.not_null()) {
305 if (hot_method == method) {
306 _hot_method = _method;
307 } else {
308 _hot_method = hot_method();
309 // only add loader or mirror if different from _method_holder
310 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
311 }
312 }
313 }
314
315 _next = NULL;
316 }
317
318 // ------------------------------------------------------------------
319 // CompileTask::code/set_code
320 nmethod* CompileTask::code() const {
321 if (_code_handle == NULL) return NULL;
322 return _code_handle->code();
323 }
324 void CompileTask::set_code(nmethod* nm) {
325 if (_code_handle == NULL && nm == NULL) return;
326 guarantee(_code_handle != NULL, "");
327 _code_handle->set_code(nm);
328 if (nm == NULL) _code_handle = NULL; // drop the handle also
329 }
330
331 void CompileTask::mark_on_stack() {
332 // Mark these methods as something redefine classes cannot remove.
333 _method->set_on_stack(true);
334 if (_hot_method != NULL) {
335 _hot_method->set_on_stack(true);
336 }
337 }
338
339 // ------------------------------------------------------------------
340 // CompileTask::print_line_on_error
341 //
342 // This function is called by fatal error handler when the thread
343 // causing troubles is a compiler thread.
344 //
345 // Do not grab any lock, do not allocate memory.
346 //
347 // Otherwise it's the same as CompileTask::print_line()
348 //
349 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
350 // print compiler name
351 st->print("%s:", CompileBroker::compiler_name(comp_level()));
352 print_compilation(st);
353 }
354
355 // ------------------------------------------------------------------
356 // CompileTask::print_line
357 void CompileTask::print_tty() {
358 ttyLocker ttyl; // keep the following output all in one block
359 // print compiler name if requested
360 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
361 print_compilation(tty);
362 }
363
364 // ------------------------------------------------------------------
365 // CompileTask::print_compilation_impl
366 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
367 bool is_osr_method, int osr_bci, bool is_blocking,
368 const char* msg, bool short_form, bool cr) {
369 if (!short_form) {
370 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
371 }
372 st->print("%4d ", compile_id); // print compilation number
373
374 // For unloaded methods the transition to zombie occurs after the
375 // method is cleared so it's impossible to report accurate
376 // information for that case.
377 bool is_synchronized = false;
378 bool has_exception_handler = false;
379 bool is_native = false;
380 if (method != NULL) {
381 is_synchronized = method->is_synchronized();
382 has_exception_handler = method->has_exception_handler();
383 is_native = method->is_native();
384 }
385 // method attributes
386 const char compile_type = is_osr_method ? '%' : ' ';
387 const char sync_char = is_synchronized ? 's' : ' ';
388 const char exception_char = has_exception_handler ? '!' : ' ';
389 const char blocking_char = is_blocking ? 'b' : ' ';
390 const char native_char = is_native ? 'n' : ' ';
391
392 // print method attributes
393 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
394
395 if (TieredCompilation) {
396 if (comp_level != -1) st->print("%d ", comp_level);
397 else st->print("- ");
398 }
399 st->print(" "); // more indent
400
401 if (method == NULL) {
402 st->print("(method)");
403 } else {
404 method->print_short_name(st);
405 if (is_osr_method) {
406 st->print(" @ %d", osr_bci);
407 }
408 if (method->is_native())
409 st->print(" (native)");
410 else
411 st->print(" (%d bytes)", method->code_size());
412 }
413
414 if (msg != NULL) {
415 st->print(" %s", msg);
416 }
417 if (cr) {
418 st->cr();
419 }
420 }
421
422 // ------------------------------------------------------------------
423 // CompileTask::print_inlining
424 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
425 // 1234567
426 st->print(" "); // print timestamp
427 // 1234
428 st->print(" "); // print compilation number
429
430 // method attributes
431 if (method->is_loaded()) {
432 const char sync_char = method->is_synchronized() ? 's' : ' ';
433 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
434 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
435
436 // print method attributes
437 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
438 } else {
439 // %s!bn
440 st->print(" "); // print method attributes
441 }
442
443 if (TieredCompilation) {
444 st->print(" ");
445 }
446 st->print(" "); // more indent
447 st->print(" "); // initial inlining indent
448
449 for (int i = 0; i < inline_level; i++) st->print(" ");
450
451 st->print("@ %d ", bci); // print bci
452 method->print_short_name(st);
453 if (method->is_loaded())
454 st->print(" (%d bytes)", method->code_size());
455 else
456 st->print(" (not loaded)");
457
458 if (msg != NULL) {
459 st->print(" %s", msg);
460 }
461 st->cr();
462 }
463
464 // ------------------------------------------------------------------
465 // CompileTask::print_inline_indent
466 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
467 // 1234567
468 st->print(" "); // print timestamp
469 // 1234
470 st->print(" "); // print compilation number
471 // %s!bn
472 st->print(" "); // print method attributes
473 if (TieredCompilation) {
474 st->print(" ");
475 }
476 st->print(" "); // more indent
477 st->print(" "); // initial inlining indent
478 for (int i = 0; i < inline_level; i++) st->print(" ");
479 }
480
481 // ------------------------------------------------------------------
482 // CompileTask::print_compilation
483 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
484 bool is_osr_method = osr_bci() != InvocationEntryBci;
485 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
486 }
487
488 // ------------------------------------------------------------------
489 // CompileTask::log_task
490 void CompileTask::log_task(xmlStream* log) {
491 Thread* thread = Thread::current();
492 methodHandle method(thread, this->method());
493 ResourceMark rm(thread);
494
495 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
496 log->print(" compile_id='%d'", _compile_id);
497 if (_osr_bci != CompileBroker::standard_entry_bci) {
498 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
499 } // else compile_kind='c2c'
500 if (!method.is_null()) log->method(method);
501 if (_osr_bci != CompileBroker::standard_entry_bci) {
502 log->print(" osr_bci='%d'", _osr_bci);
503 }
504 if (_comp_level != CompLevel_highest_tier) {
505 log->print(" level='%d'", _comp_level);
506 }
507 if (_is_blocking) {
508 log->print(" blocking='1'");
509 }
510 log->stamp();
511 }
512
513
514 // ------------------------------------------------------------------
515 // CompileTask::log_task_queued
516 void CompileTask::log_task_queued() {
517 Thread* thread = Thread::current();
518 ttyLocker ttyl;
519 ResourceMark rm(thread);
520
521 xtty->begin_elem("task_queued");
522 log_task(xtty);
523 if (_comment != NULL) {
524 xtty->print(" comment='%s'", _comment);
525 }
526 if (_hot_method != NULL) {
527 methodHandle hot(thread, _hot_method);
528 methodHandle method(thread, _method);
529 if (hot() != method()) {
530 xtty->method(hot);
531 }
532 }
533 if (_hot_count != 0) {
534 xtty->print(" hot_count='%d'", _hot_count);
535 }
536 xtty->end_elem();
537 }
538
539
540 // ------------------------------------------------------------------
541 // CompileTask::log_task_start
542 void CompileTask::log_task_start(CompileLog* log) {
543 log->begin_head("task");
544 log_task(log);
545 log->end_head();
546 }
547
548
549 // ------------------------------------------------------------------
550 // CompileTask::log_task_done
551 void CompileTask::log_task_done(CompileLog* log) {
552 Thread* thread = Thread::current();
553 methodHandle method(thread, this->method());
554 ResourceMark rm(thread);
555
556 if (!_is_success) {
557 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
558 log->elem("failure reason='%s'", reason);
559 }
560
561 // <task_done ... stamp='1.234'> </task>
562 nmethod* nm = code();
563 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
564 _is_success, nm == NULL ? 0 : nm->content_size(),
565 method->invocation_count());
566 int bec = method->backedge_count();
567 if (bec != 0) log->print(" backedge_count='%d'", bec);
568 // Note: "_is_complete" is about to be set, but is not.
569 if (_num_inlined_bytecodes != 0) {
570 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
571 }
572 log->stamp();
573 log->end_elem();
574 log->tail("task");
575 log->clear_identities(); // next task will have different CI
576 if (log->unflushed_count() > 2000) {
577 log->flush();
578 }
579 log->mark_file_end();
580 }
581
582
583
584 /**
585 * Add a CompileTask to a CompileQueue.
586 */
587 void CompileQueue::add(CompileTask* task) {
588 assert(lock()->owned_by_self(), "must own lock");
589
590 task->set_next(NULL);
591 task->set_prev(NULL);
592
593 if (_last == NULL) {
594 // The compile queue is empty.
595 assert(_first == NULL, "queue is empty");
596 _first = task;
597 _last = task;
598 } else {
599 // Append the task to the queue.
600 assert(_last->next() == NULL, "not last");
601 _last->set_next(task);
602 task->set_prev(_last);
603 _last = task;
604 }
605 ++_size;
606
607 // Mark the method as being in the compile queue.
608 task->method()->set_queued_for_compilation();
609
610 if (CIPrintCompileQueue) {
611 print_tty();
612 }
613
614 if (LogCompilation && xtty != NULL) {
615 task->log_task_queued();
616 }
617
618 // Notify CompilerThreads that a task is available.
619 lock()->notify_all();
620 }
621
622 /**
623 * Empties compilation queue by putting all compilation tasks onto
624 * a freelist. Furthermore, the method wakes up all threads that are
625 * waiting on a compilation task to finish. This can happen if background
626 * compilation is disabled.
627 */
628 void CompileQueue::free_all() {
629 MutexLocker mu(lock());
630 CompileTask* next = _first;
631
632 // Iterate over all tasks in the compile queue
633 while (next != NULL) {
634 CompileTask* current = next;
635 next = current->next();
636 {
637 // Wake up thread that blocks on the compile task.
638 MutexLocker ct_lock(current->lock());
639 current->lock()->notify();
640 }
641 // Put the task back on the freelist.
642 CompileTask::free(current);
643 }
644 _first = NULL;
645
646 // Wake up all threads that block on the queue.
647 lock()->notify_all();
648 }
649
650 // ------------------------------------------------------------------
651 // CompileQueue::get
652 //
653 // Get the next CompileTask from a CompileQueue
654 CompileTask* CompileQueue::get() {
655 NMethodSweeper::possibly_sweep();
656
657 MutexLocker locker(lock());
658 // If _first is NULL we have no more compile jobs. There are two reasons for
659 // having no compile jobs: First, we compiled everything we wanted. Second,
660 // we ran out of code cache so compilation has been disabled. In the latter
661 // case we perform code cache sweeps to free memory such that we can re-enable
662 // compilation.
663 while (_first == NULL) {
664 // Exit loop if compilation is disabled forever
665 if (CompileBroker::is_compilation_disabled_forever()) {
666 return NULL;
667 }
668
669 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
670 // Wait a certain amount of time to possibly do another sweep.
671 // We must wait until stack scanning has happened so that we can
672 // transition a method's state from 'not_entrant' to 'zombie'.
673 long wait_time = NmethodSweepCheckInterval * 1000;
674 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
675 // Only one thread at a time can do sweeping. Scale the
676 // wait time according to the number of compiler threads.
677 // As a result, the next sweep is likely to happen every 100ms
678 // with an arbitrary number of threads that do sweeping.
679 wait_time = 100 * CICompilerCount;
680 }
681 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
682 if (timeout) {
683 MutexUnlocker ul(lock());
684 NMethodSweeper::possibly_sweep();
685 }
686 } else {
687 // If there are no compilation tasks and we can compile new jobs
688 // (i.e., there is enough free space in the code cache) there is
689 // no need to invoke the sweeper. As a result, the hotness of methods
690 // remains unchanged. This behavior is desired, since we want to keep
691 // the stable state, i.e., we do not want to evict methods from the
692 // code cache if it is unnecessary.
693 // We need a timed wait here, since compiler threads can exit if compilation
694 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
695 // is not critical and we do not want idle compiler threads to wake up too often.
696 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
697 }
698 }
699
700 if (CompileBroker::is_compilation_disabled_forever()) {
701 return NULL;
702 }
703
704 CompileTask* task;
705 {
706 No_Safepoint_Verifier nsv;
707 task = CompilationPolicy::policy()->select_task(this);
708 }
709 remove(task);
710 purge_stale_tasks(); // may temporarily release MCQ lock
711 return task;
712 }
713
714 // Clean & deallocate stale compile tasks.
715 // Temporarily releases MethodCompileQueue lock.
716 void CompileQueue::purge_stale_tasks() {
717 assert(lock()->owned_by_self(), "must own lock");
718 if (_first_stale != NULL) {
719 // Stale tasks are purged when MCQ lock is released,
720 // but _first_stale updates are protected by MCQ lock.
721 // Once task processing starts and MCQ lock is released,
722 // other compiler threads can reuse _first_stale.
723 CompileTask* head = _first_stale;
724 _first_stale = NULL;
725 {
726 MutexUnlocker ul(lock());
727 for (CompileTask* task = head; task != NULL; ) {
728 CompileTask* next_task = task->next();
729 CompileTaskWrapper ctw(task); // Frees the task
730 task->set_failure_reason("stale task");
731 task = next_task;
732 }
733 }
734 }
735 }
736
737 void CompileQueue::remove(CompileTask* task) {
738 assert(lock()->owned_by_self(), "must own lock");
739 if (task->prev() != NULL) {
740 task->prev()->set_next(task->next());
741 } else {
742 // max is the first element
743 assert(task == _first, "Sanity");
744 _first = task->next();
745 }
746
747 if (task->next() != NULL) {
748 task->next()->set_prev(task->prev());
749 } else {
750 // max is the last element
751 assert(task == _last, "Sanity");
752 _last = task->prev();
753 }
754 --_size;
755 }
756
757 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
758 assert(lock()->owned_by_self(), "must own lock");
759 remove(task);
760
761 // Enqueue the task for reclamation (should be done outside MCQ lock)
762 task->set_next(_first_stale);
763 task->set_prev(NULL);
764 _first_stale = task;
765 }
766
767 // methods in the compile queue need to be marked as used on the stack
768 // so that they don't get reclaimed by Redefine Classes
769 void CompileQueue::mark_on_stack() {
770 CompileTask* task = _first;
771 while (task != NULL) {
772 task->mark_on_stack();
773 task = task->next();
774 }
775 }
776
777
778 CompileQueue* CompileBroker::compile_queue(int comp_level) {
779 if (is_c2_compile(comp_level)) return _c2_compile_queue;
780 if (is_c1_compile(comp_level)) return _c1_compile_queue;
781 return NULL;
782 }
783
784
785 void CompileBroker::print_compile_queues(outputStream* st) {
786 _c1_compile_queue->print(st);
787 _c2_compile_queue->print(st);
788 }
789
790
791 void CompileQueue::print(outputStream* st) {
792 assert_locked_or_safepoint(lock());
793 st->print_cr("Contents of %s", name());
794 st->print_cr("----------------------------");
795 CompileTask* task = _first;
796 if (task == NULL) {
797 st->print_cr("Empty");;
798 } else {
799 while (task != NULL) {
800 task->print_compilation(st, NULL, true, true);
801 task = task->next();
802 }
803 }
804 st->print_cr("----------------------------");
805 }
806
807 void CompileQueue::print_tty() {
808 ttyLocker ttyl;
809 print(tty);
810 }
811
812 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
813
814 _current_method[0] = '\0';
815 _compile_type = CompileBroker::no_compile;
816
817 if (UsePerfData) {
818 ResourceMark rm;
819
820 // create the thread instance name space string - don't create an
821 // instance subspace if instance is -1 - keeps the adapterThread
822 // counters from having a ".0" namespace.
823 const char* thread_i = (instance == -1) ? thread_name :
824 PerfDataManager::name_space(thread_name, instance);
825
826
827 char* name = PerfDataManager::counter_name(thread_i, "method");
828 _perf_current_method =
829 PerfDataManager::create_string_variable(SUN_CI, name,
830 cmname_buffer_length,
831 _current_method, CHECK);
832
833 name = PerfDataManager::counter_name(thread_i, "type");
834 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
835 PerfData::U_None,
836 (jlong)_compile_type,
837 CHECK);
838
839 name = PerfDataManager::counter_name(thread_i, "time");
840 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
841 PerfData::U_Ticks, CHECK);
842
843 name = PerfDataManager::counter_name(thread_i, "compiles");
844 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
845 PerfData::U_Events, CHECK);
846 }
847 }
848
849 // ------------------------------------------------------------------
850 // CompileBroker::compilation_init
851 //
852 // Initialize the Compilation object
853 void CompileBroker::compilation_init() {
854 _last_method_compiled[0] = '\0';
855
856 // No need to initialize compilation system if we do not use it.
857 if (!UseCompiler) {
858 return;
859 }
860 #ifndef SHARK
861 // Set the interface to the current compiler(s).
862 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
863 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
864 #ifdef COMPILER1
865 if (c1_count > 0) {
866 _compilers[0] = new Compiler();
867 }
868 #endif // COMPILER1
869
870 #ifdef COMPILER2
871 if (c2_count > 0) {
872 _compilers[1] = new C2Compiler();
873 }
874 #endif // COMPILER2
875
876 #else // SHARK
877 int c1_count = 0;
878 int c2_count = 1;
879
880 _compilers[1] = new SharkCompiler();
881 #endif // SHARK
882
883 // Start the CompilerThreads
884 init_compiler_threads(c1_count, c2_count);
885 // totalTime performance counter is always created as it is required
886 // by the implementation of java.lang.management.CompilationMBean.
887 {
888 EXCEPTION_MARK;
889 _perf_total_compilation =
890 PerfDataManager::create_counter(JAVA_CI, "totalTime",
891 PerfData::U_Ticks, CHECK);
892 }
893
894
895 if (UsePerfData) {
896
897 EXCEPTION_MARK;
898
899 // create the jvmstat performance counters
900 _perf_osr_compilation =
901 PerfDataManager::create_counter(SUN_CI, "osrTime",
902 PerfData::U_Ticks, CHECK);
903
904 _perf_standard_compilation =
905 PerfDataManager::create_counter(SUN_CI, "standardTime",
906 PerfData::U_Ticks, CHECK);
907
908 _perf_total_bailout_count =
909 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
910 PerfData::U_Events, CHECK);
911
912 _perf_total_invalidated_count =
913 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
914 PerfData::U_Events, CHECK);
915
916 _perf_total_compile_count =
917 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
918 PerfData::U_Events, CHECK);
919 _perf_total_osr_compile_count =
920 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
921 PerfData::U_Events, CHECK);
922
923 _perf_total_standard_compile_count =
924 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
925 PerfData::U_Events, CHECK);
926
927 _perf_sum_osr_bytes_compiled =
928 PerfDataManager::create_counter(SUN_CI, "osrBytes",
929 PerfData::U_Bytes, CHECK);
930
931 _perf_sum_standard_bytes_compiled =
932 PerfDataManager::create_counter(SUN_CI, "standardBytes",
933 PerfData::U_Bytes, CHECK);
934
935 _perf_sum_nmethod_size =
936 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
937 PerfData::U_Bytes, CHECK);
938
939 _perf_sum_nmethod_code_size =
940 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
941 PerfData::U_Bytes, CHECK);
942
943 _perf_last_method =
944 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
945 CompilerCounters::cmname_buffer_length,
946 "", CHECK);
947
948 _perf_last_failed_method =
949 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
950 CompilerCounters::cmname_buffer_length,
951 "", CHECK);
952
953 _perf_last_invalidated_method =
954 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
955 CompilerCounters::cmname_buffer_length,
956 "", CHECK);
957
958 _perf_last_compile_type =
959 PerfDataManager::create_variable(SUN_CI, "lastType",
960 PerfData::U_None,
961 (jlong)CompileBroker::no_compile,
962 CHECK);
963
964 _perf_last_compile_size =
965 PerfDataManager::create_variable(SUN_CI, "lastSize",
966 PerfData::U_Bytes,
967 (jlong)CompileBroker::no_compile,
968 CHECK);
969
970
971 _perf_last_failed_type =
972 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
973 PerfData::U_None,
974 (jlong)CompileBroker::no_compile,
975 CHECK);
976
977 _perf_last_invalidated_type =
978 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
979 PerfData::U_None,
980 (jlong)CompileBroker::no_compile,
981 CHECK);
982 }
983
984 _initialized = true;
985 }
986
987
988 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
989 AbstractCompiler* comp, TRAPS) {
990 CompilerThread* compiler_thread = NULL;
991
992 Klass* k =
993 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
994 true, CHECK_0);
995 instanceKlassHandle klass (THREAD, k);
996 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
997 Handle string = java_lang_String::create_from_str(name, CHECK_0);
998
999 // Initialize thread_oop to put it into the system threadGroup
1000 Handle thread_group (THREAD, Universe::system_thread_group());
1001 JavaValue result(T_VOID);
1002 JavaCalls::call_special(&result, thread_oop,
1003 klass,
1004 vmSymbols::object_initializer_name(),
1005 vmSymbols::threadgroup_string_void_signature(),
1006 thread_group,
1007 string,
1008 CHECK_0);
1009
1010 {
1011 MutexLocker mu(Threads_lock, THREAD);
1012 compiler_thread = new CompilerThread(queue, counters);
1013 // At this point the new CompilerThread data-races with this startup
1014 // thread (which I believe is the primoridal thread and NOT the VM
1015 // thread). This means Java bytecodes being executed at startup can
1016 // queue compile jobs which will run at whatever default priority the
1017 // newly created CompilerThread runs at.
1018
1019
1020 // At this point it may be possible that no osthread was created for the
1021 // JavaThread due to lack of memory. We would have to throw an exception
1022 // in that case. However, since this must work and we do not allow
1023 // exceptions anyway, check and abort if this fails.
1024
1025 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1026 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1027 os::native_thread_creation_failed_msg());
1028 }
1029
1030 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1031
1032 // Note that this only sets the JavaThread _priority field, which by
1033 // definition is limited to Java priorities and not OS priorities.
1034 // The os-priority is set in the CompilerThread startup code itself
1035
1036 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1037
1038 // Note that we cannot call os::set_priority because it expects Java
1039 // priorities and we are *explicitly* using OS priorities so that it's
1040 // possible to set the compiler thread priority higher than any Java
1041 // thread.
1042
1043 int native_prio = CompilerThreadPriority;
1044 if (native_prio == -1) {
1045 if (UseCriticalCompilerThreadPriority) {
1046 native_prio = os::java_to_os_priority[CriticalPriority];
1047 } else {
1048 native_prio = os::java_to_os_priority[NearMaxPriority];
1049 }
1050 }
1051 os::set_native_priority(compiler_thread, native_prio);
1052
1053 java_lang_Thread::set_daemon(thread_oop());
1054
1055 compiler_thread->set_threadObj(thread_oop());
1056 compiler_thread->set_compiler(comp);
1057 Threads::add(compiler_thread);
1058 Thread::start(compiler_thread);
1059 }
1060
1061 // Let go of Threads_lock before yielding
1062 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1063
1064 return compiler_thread;
1065 }
1066
1067
1068 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1069 EXCEPTION_MARK;
1070 #if !defined(ZERO) && !defined(SHARK)
1071 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1072 #endif // !ZERO && !SHARK
1073 // Initialize the compilation queue
1074 if (c2_compiler_count > 0) {
1075 _c2_compile_queue = new CompileQueue("C2 compile queue", MethodCompileQueue_lock);
1076 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1077 }
1078 if (c1_compiler_count > 0) {
1079 _c1_compile_queue = new CompileQueue("C1 compile queue", MethodCompileQueue_lock);
1080 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1081 }
1082
1083 int compiler_count = c1_compiler_count + c2_compiler_count;
1084
1085 _compiler_threads =
1086 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1087
1088 char name_buffer[256];
1089 for (int i = 0; i < c2_compiler_count; i++) {
1090 // Create a name for our thread.
1091 sprintf(name_buffer, "C2 CompilerThread%d", i);
1092 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1093 // Shark and C2
1094 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1095 _compiler_threads->append(new_thread);
1096 }
1097
1098 for (int i = c2_compiler_count; i < compiler_count; i++) {
1099 // Create a name for our thread.
1100 sprintf(name_buffer, "C1 CompilerThread%d", i);
1101 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1102 // C1
1103 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1104 _compiler_threads->append(new_thread);
1105 }
1106
1107 if (UsePerfData) {
1108 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1109 }
1110 }
1111
1112
1113 /**
1114 * Set the methods on the stack as on_stack so that redefine classes doesn't
1115 * reclaim them. This method is executed at a safepoint.
1116 */
1117 void CompileBroker::mark_on_stack() {
1118 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1119 // Since we are at a safepoint, we do not need a lock to access
1120 // the compile queues.
1121 if (_c2_compile_queue != NULL) {
1122 _c2_compile_queue->mark_on_stack();
1123 }
1124 if (_c1_compile_queue != NULL) {
1125 _c1_compile_queue->mark_on_stack();
1126 }
1127 }
1128
1129 // ------------------------------------------------------------------
1130 // CompileBroker::compile_method
1131 //
1132 // Request compilation of a method.
1133 void CompileBroker::compile_method_base(methodHandle method,
1134 int osr_bci,
1135 int comp_level,
1136 methodHandle hot_method,
1137 int hot_count,
1138 const char* comment,
1139 Thread* thread) {
1140 // do nothing if compiler thread(s) is not available
1141 if (!_initialized) {
1142 return;
1143 }
1144
1145 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1146 assert(method->method_holder()->oop_is_instance(),
1147 "sanity check");
1148 assert(!method->method_holder()->is_not_initialized(),
1149 "method holder must be initialized");
1150 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1151
1152 if (CIPrintRequests) {
1153 tty->print("request: ");
1154 method->print_short_name(tty);
1155 if (osr_bci != InvocationEntryBci) {
1156 tty->print(" osr_bci: %d", osr_bci);
1157 }
1158 tty->print(" comment: %s count: %d", comment, hot_count);
1159 if (!hot_method.is_null()) {
1160 tty->print(" hot: ");
1161 if (hot_method() != method()) {
1162 hot_method->print_short_name(tty);
1163 } else {
1164 tty->print("yes");
1165 }
1166 }
1167 tty->cr();
1168 }
1169
1170 // A request has been made for compilation. Before we do any
1171 // real work, check to see if the method has been compiled
1172 // in the meantime with a definitive result.
1173 if (compilation_is_complete(method, osr_bci, comp_level)) {
1174 return;
1175 }
1176
1177 #ifndef PRODUCT
1178 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1179 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1180 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1181 return;
1182 }
1183 }
1184 #endif
1185
1186 // If this method is already in the compile queue, then
1187 // we do not block the current thread.
1188 if (compilation_is_in_queue(method)) {
1189 // We may want to decay our counter a bit here to prevent
1190 // multiple denied requests for compilation. This is an
1191 // open compilation policy issue. Note: The other possibility,
1192 // in the case that this is a blocking compile request, is to have
1193 // all subsequent blocking requesters wait for completion of
1194 // ongoing compiles. Note that in this case we'll need a protocol
1195 // for freeing the associated compile tasks. [Or we could have
1196 // a single static monitor on which all these waiters sleep.]
1197 return;
1198 }
1199
1200 // If the requesting thread is holding the pending list lock
1201 // then we just return. We can't risk blocking while holding
1202 // the pending list lock or a 3-way deadlock may occur
1203 // between the reference handler thread, a GC (instigated
1204 // by a compiler thread), and compiled method registration.
1205 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1206 return;
1207 }
1208
1209 if (TieredCompilation) {
1210 // Tiered policy requires MethodCounters to exist before adding a method to
1211 // the queue. Create if we don't have them yet.
1212 method->get_method_counters(thread);
1213 }
1214
1215 // Outputs from the following MutexLocker block:
1216 CompileTask* task = NULL;
1217 bool blocking = false;
1218 CompileQueue* queue = compile_queue(comp_level);
1219
1220 // Acquire our lock.
1221 {
1222 MutexLocker locker(queue->lock(), thread);
1223
1224 // Make sure the method has not slipped into the queues since
1225 // last we checked; note that those checks were "fast bail-outs".
1226 // Here we need to be more careful, see 14012000 below.
1227 if (compilation_is_in_queue(method)) {
1228 return;
1229 }
1230
1231 // We need to check again to see if the compilation has
1232 // completed. A previous compilation may have registered
1233 // some result.
1234 if (compilation_is_complete(method, osr_bci, comp_level)) {
1235 return;
1236 }
1237
1238 // We now know that this compilation is not pending, complete,
1239 // or prohibited. Assign a compile_id to this compilation
1240 // and check to see if it is in our [Start..Stop) range.
1241 int compile_id = assign_compile_id(method, osr_bci);
1242 if (compile_id == 0) {
1243 // The compilation falls outside the allowed range.
1244 return;
1245 }
1246
1247 // Should this thread wait for completion of the compile?
1248 blocking = is_compile_blocking();
1249
1250 // We will enter the compilation in the queue.
1251 // 14012000: Note that this sets the queued_for_compile bits in
1252 // the target method. We can now reason that a method cannot be
1253 // queued for compilation more than once, as follows:
1254 // Before a thread queues a task for compilation, it first acquires
1255 // the compile queue lock, then checks if the method's queued bits
1256 // are set or it has already been compiled. Thus there can not be two
1257 // instances of a compilation task for the same method on the
1258 // compilation queue. Consider now the case where the compilation
1259 // thread has already removed a task for that method from the queue
1260 // and is in the midst of compiling it. In this case, the
1261 // queued_for_compile bits must be set in the method (and these
1262 // will be visible to the current thread, since the bits were set
1263 // under protection of the compile queue lock, which we hold now.
1264 // When the compilation completes, the compiler thread first sets
1265 // the compilation result and then clears the queued_for_compile
1266 // bits. Neither of these actions are protected by a barrier (or done
1267 // under the protection of a lock), so the only guarantee we have
1268 // (on machines with TSO (Total Store Order)) is that these values
1269 // will update in that order. As a result, the only combinations of
1270 // these bits that the current thread will see are, in temporal order:
1271 // <RESULT, QUEUE> :
1272 // <0, 1> : in compile queue, but not yet compiled
1273 // <1, 1> : compiled but queue bit not cleared
1274 // <1, 0> : compiled and queue bit cleared
1275 // Because we first check the queue bits then check the result bits,
1276 // we are assured that we cannot introduce a duplicate task.
1277 // Note that if we did the tests in the reverse order (i.e. check
1278 // result then check queued bit), we could get the result bit before
1279 // the compilation completed, and the queue bit after the compilation
1280 // completed, and end up introducing a "duplicate" (redundant) task.
1281 // In that case, the compiler thread should first check if a method
1282 // has already been compiled before trying to compile it.
1283 // NOTE: in the event that there are multiple compiler threads and
1284 // there is de-optimization/recompilation, things will get hairy,
1285 // and in that case it's best to protect both the testing (here) of
1286 // these bits, and their updating (here and elsewhere) under a
1287 // common lock.
1288 task = create_compile_task(queue,
1289 compile_id, method,
1290 osr_bci, comp_level,
1291 hot_method, hot_count, comment,
1292 blocking);
1293 }
1294
1295 if (blocking) {
1296 wait_for_completion(task);
1297 }
1298 }
1299
1300
1301 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1302 int comp_level,
1303 methodHandle hot_method, int hot_count,
1304 const char* comment, Thread* THREAD) {
1305 // make sure arguments make sense
1306 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1307 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1308 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1309 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1310 // allow any levels for WhiteBox
1311 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1312 // return quickly if possible
1313
1314 // lock, make sure that the compilation
1315 // isn't prohibited in a straightforward way.
1316 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1317 if (comp == NULL || !comp->can_compile_method(method) ||
1318 compilation_is_prohibited(method, osr_bci, comp_level)) {
1319 return NULL;
1320 }
1321
1322 if (osr_bci == InvocationEntryBci) {
1323 // standard compilation
1324 nmethod* method_code = method->code();
1325 if (method_code != NULL) {
1326 if (compilation_is_complete(method, osr_bci, comp_level)) {
1327 return method_code;
1328 }
1329 }
1330 if (method->is_not_compilable(comp_level)) {
1331 return NULL;
1332 }
1333 } else {
1334 // osr compilation
1335 #ifndef TIERED
1336 // seems like an assert of dubious value
1337 assert(comp_level == CompLevel_highest_tier,
1338 "all OSR compiles are assumed to be at a single compilation lavel");
1339 #endif // TIERED
1340 // We accept a higher level osr method
1341 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1342 if (nm != NULL) return nm;
1343 if (method->is_not_osr_compilable(comp_level)) return NULL;
1344 }
1345
1346 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1347 // some prerequisites that are compiler specific
1348 if (comp->is_c2() || comp->is_shark()) {
1349 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1350 // Resolve all classes seen in the signature of the method
1351 // we are compiling.
1352 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1353 }
1354
1355 // If the method is native, do the lookup in the thread requesting
1356 // the compilation. Native lookups can load code, which is not
1357 // permitted during compilation.
1358 //
1359 // Note: A native method implies non-osr compilation which is
1360 // checked with an assertion at the entry of this method.
1361 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1362 bool in_base_library;
1363 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1364 if (HAS_PENDING_EXCEPTION) {
1365 // In case of an exception looking up the method, we just forget
1366 // about it. The interpreter will kick-in and throw the exception.
1367 method->set_not_compilable(); // implies is_not_osr_compilable()
1368 CLEAR_PENDING_EXCEPTION;
1369 return NULL;
1370 }
1371 assert(method->has_native_function(), "must have native code by now");
1372 }
1373
1374 // RedefineClasses() has replaced this method; just return
1375 if (method->is_old()) {
1376 return NULL;
1377 }
1378
1379 // JVMTI -- post_compile_event requires jmethod_id() that may require
1380 // a lock the compiling thread can not acquire. Prefetch it here.
1381 if (JvmtiExport::should_post_compiled_method_load()) {
1382 method->jmethod_id();
1383 }
1384
1385 // do the compilation
1386 if (method->is_native()) {
1387 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1388 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1389 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1390 //
1391 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1392 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1393 AdapterHandlerLibrary::create_native_wrapper(method);
1394 } else {
1395 return NULL;
1396 }
1397 } else {
1398 // If the compiler is shut off due to code cache getting full
1399 // fail out now so blocking compiles dont hang the java thread
1400 if (!should_compile_new_jobs()) {
1401 CompilationPolicy::policy()->delay_compilation(method());
1402 return NULL;
1403 }
1404 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1405 }
1406
1407 // return requested nmethod
1408 // We accept a higher level osr method
1409 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1410 }
1411
1412
1413 // ------------------------------------------------------------------
1414 // CompileBroker::compilation_is_complete
1415 //
1416 // See if compilation of this method is already complete.
1417 bool CompileBroker::compilation_is_complete(methodHandle method,
1418 int osr_bci,
1419 int comp_level) {
1420 bool is_osr = (osr_bci != standard_entry_bci);
1421 if (is_osr) {
1422 if (method->is_not_osr_compilable(comp_level)) {
1423 return true;
1424 } else {
1425 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1426 return (result != NULL);
1427 }
1428 } else {
1429 if (method->is_not_compilable(comp_level)) {
1430 return true;
1431 } else {
1432 nmethod* result = method->code();
1433 if (result == NULL) return false;
1434 return comp_level == result->comp_level();
1435 }
1436 }
1437 }
1438
1439
1440 /**
1441 * See if this compilation is already requested.
1442 *
1443 * Implementation note: there is only a single "is in queue" bit
1444 * for each method. This means that the check below is overly
1445 * conservative in the sense that an osr compilation in the queue
1446 * will block a normal compilation from entering the queue (and vice
1447 * versa). This can be remedied by a full queue search to disambiguate
1448 * cases. If it is deemed profitable, this may be done.
1449 */
1450 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1451 return method->queued_for_compilation();
1452 }
1453
1454 // ------------------------------------------------------------------
1455 // CompileBroker::compilation_is_prohibited
1456 //
1457 // See if this compilation is not allowed.
1458 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1459 bool is_native = method->is_native();
1460 // Some compilers may not support the compilation of natives.
1461 AbstractCompiler *comp = compiler(comp_level);
1462 if (is_native &&
1463 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1464 method->set_not_compilable_quietly(comp_level);
1465 return true;
1466 }
1467
1468 bool is_osr = (osr_bci != standard_entry_bci);
1469 // Some compilers may not support on stack replacement.
1470 if (is_osr &&
1471 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1472 method->set_not_osr_compilable(comp_level);
1473 return true;
1474 }
1475
1476 // The method may be explicitly excluded by the user.
1477 bool quietly;
1478 if (CompilerOracle::should_exclude(method, quietly)) {
1479 if (!quietly) {
1480 // This does not happen quietly...
1481 ResourceMark rm;
1482 tty->print("### Excluding %s:%s",
1483 method->is_native() ? "generation of native wrapper" : "compile",
1484 (method->is_static() ? " static" : ""));
1485 method->print_short_name(tty);
1486 tty->cr();
1487 }
1488 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1489 }
1490
1491 return false;
1492 }
1493
1494 /**
1495 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1496 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1497 * The function also allows to generate separate compilation IDs for OSR compilations.
1498 */
1499 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1500 #ifdef ASSERT
1501 bool is_osr = (osr_bci != standard_entry_bci);
1502 int id;
1503 if (method->is_native()) {
1504 assert(!is_osr, "can't be osr");
1505 // Adapters, native wrappers and method handle intrinsics
1506 // should be generated always.
1507 return Atomic::add(1, &_compilation_id);
1508 } else if (CICountOSR && is_osr) {
1509 id = Atomic::add(1, &_osr_compilation_id);
1510 if (CIStartOSR <= id && id < CIStopOSR) {
1511 return id;
1512 }
1513 } else {
1514 id = Atomic::add(1, &_compilation_id);
1515 if (CIStart <= id && id < CIStop) {
1516 return id;
1517 }
1518 }
1519
1520 // Method was not in the appropriate compilation range.
1521 method->set_not_compilable_quietly();
1522 return 0;
1523 #else
1524 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1525 // only _compilation_id is incremented.
1526 return Atomic::add(1, &_compilation_id);
1527 #endif
1528 }
1529
1530 /**
1531 * Should the current thread block until this compilation request
1532 * has been fulfilled?
1533 */
1534 bool CompileBroker::is_compile_blocking() {
1535 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1536 return !BackgroundCompilation;
1537 }
1538
1539
1540 // ------------------------------------------------------------------
1541 // CompileBroker::preload_classes
1542 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1543 // Move this code over from c1_Compiler.cpp
1544 ShouldNotReachHere();
1545 }
1546
1547
1548 // ------------------------------------------------------------------
1549 // CompileBroker::create_compile_task
1550 //
1551 // Create a CompileTask object representing the current request for
1552 // compilation. Add this task to the queue.
1553 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1554 int compile_id,
1555 methodHandle method,
1556 int osr_bci,
1557 int comp_level,
1558 methodHandle hot_method,
1559 int hot_count,
1560 const char* comment,
1561 bool blocking) {
1562 CompileTask* new_task = CompileTask::allocate();
1563 new_task->initialize(compile_id, method, osr_bci, comp_level,
1564 hot_method, hot_count, comment,
1565 blocking);
1566 queue->add(new_task);
1567 return new_task;
1568 }
1569
1570
1571 /**
1572 * Wait for the compilation task to complete.
1573 */
1574 void CompileBroker::wait_for_completion(CompileTask* task) {
1575 if (CIPrintCompileQueue) {
1576 ttyLocker ttyl;
1577 tty->print_cr("BLOCKING FOR COMPILE");
1578 }
1579
1580 assert(task->is_blocking(), "can only wait on blocking task");
1581
1582 JavaThread* thread = JavaThread::current();
1583 thread->set_blocked_on_compilation(true);
1584
1585 methodHandle method(thread, task->method());
1586 {
1587 MutexLocker waiter(task->lock(), thread);
1588
1589 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1590 task->lock()->wait();
1591 }
1592 }
1593
1594 thread->set_blocked_on_compilation(false);
1595 if (is_compilation_disabled_forever()) {
1596 CompileTask::free(task);
1597 return;
1598 }
1599
1600 // It is harmless to check this status without the lock, because
1601 // completion is a stable property (until the task object is recycled).
1602 assert(task->is_complete(), "Compilation should have completed");
1603 assert(task->code_handle() == NULL, "must be reset");
1604
1605 // By convention, the waiter is responsible for recycling a
1606 // blocking CompileTask. Since there is only one waiter ever
1607 // waiting on a CompileTask, we know that no one else will
1608 // be using this CompileTask; we can free it.
1609 CompileTask::free(task);
1610 }
1611
1612 /**
1613 * Initialize compiler thread(s) + compiler object(s). The postcondition
1614 * of this function is that the compiler runtimes are initialized and that
1615 * compiler threads can start compiling.
1616 */
1617 bool CompileBroker::init_compiler_runtime() {
1618 CompilerThread* thread = CompilerThread::current();
1619 AbstractCompiler* comp = thread->compiler();
1620 // Final sanity check - the compiler object must exist
1621 guarantee(comp != NULL, "Compiler object must exist");
1622
1623 int system_dictionary_modification_counter;
1624 {
1625 MutexLocker locker(Compile_lock, thread);
1626 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1627 }
1628
1629 {
1630 // Must switch to native to allocate ci_env
1631 ThreadToNativeFromVM ttn(thread);
1632 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1633 // Cache Jvmti state
1634 ci_env.cache_jvmti_state();
1635 // Cache DTrace flags
1636 ci_env.cache_dtrace_flags();
1637
1638 // Switch back to VM state to do compiler initialization
1639 ThreadInVMfromNative tv(thread);
1640 ResetNoHandleMark rnhm;
1641
1642
1643 if (!comp->is_shark()) {
1644 // Perform per-thread and global initializations
1645 comp->initialize();
1646 }
1647 }
1648
1649 if (comp->is_failed()) {
1650 disable_compilation_forever();
1651 // If compiler initialization failed, no compiler thread that is specific to a
1652 // particular compiler runtime will ever start to compile methods.
1653 shutdown_compiler_runtime(comp, thread);
1654 return false;
1655 }
1656
1657 // C1 specific check
1658 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1659 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1660 return false;
1661 }
1662
1663 return true;
1664 }
1665
1666 /**
1667 * If C1 and/or C2 initialization failed, we shut down all compilation.
1668 * We do this to keep things simple. This can be changed if it ever turns
1669 * out to be a problem.
1670 */
1671 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1672 // Free buffer blob, if allocated
1673 if (thread->get_buffer_blob() != NULL) {
1674 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1675 CodeCache::free(thread->get_buffer_blob());
1676 }
1677
1678 if (comp->should_perform_shutdown()) {
1679 // There are two reasons for shutting down the compiler
1680 // 1) compiler runtime initialization failed
1681 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1682 warning("%s initialization failed. Shutting down all compilers", comp->name());
1683
1684 // Only one thread per compiler runtime object enters here
1685 // Set state to shut down
1686 comp->set_shut_down();
1687
1688 // Delete all queued compilation tasks to make compiler threads exit faster.
1689 if (_c1_compile_queue != NULL) {
1690 _c1_compile_queue->free_all();
1691 }
1692
1693 if (_c2_compile_queue != NULL) {
1694 _c2_compile_queue->free_all();
1695 }
1696
1697 // Set flags so that we continue execution with using interpreter only.
1698 UseCompiler = false;
1699 UseInterpreter = true;
1700
1701 // We could delete compiler runtimes also. However, there are references to
1702 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1703 // fail. This can be done later if necessary.
1704 }
1705 }
1706
1707 // ------------------------------------------------------------------
1708 // CompileBroker::compiler_thread_loop
1709 //
1710 // The main loop run by a CompilerThread.
1711 void CompileBroker::compiler_thread_loop() {
1712 CompilerThread* thread = CompilerThread::current();
1713 CompileQueue* queue = thread->queue();
1714 // For the thread that initializes the ciObjectFactory
1715 // this resource mark holds all the shared objects
1716 ResourceMark rm;
1717
1718 // First thread to get here will initialize the compiler interface
1719
1720 if (!ciObjectFactory::is_initialized()) {
1721 ASSERT_IN_VM;
1722 MutexLocker only_one (CompileThread_lock, thread);
1723 if (!ciObjectFactory::is_initialized()) {
1724 ciObjectFactory::initialize();
1725 }
1726 }
1727
1728 // Open a log.
1729 if (LogCompilation) {
1730 init_compiler_thread_log();
1731 }
1732 CompileLog* log = thread->log();
1733 if (log != NULL) {
1734 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1735 thread->name(),
1736 os::current_thread_id(),
1737 os::current_process_id());
1738 log->stamp();
1739 log->end_elem();
1740 }
1741
1742 // If compiler thread/runtime initialization fails, exit the compiler thread
1743 if (!init_compiler_runtime()) {
1744 return;
1745 }
1746
1747 // Poll for new compilation tasks as long as the JVM runs. Compilation
1748 // should only be disabled if something went wrong while initializing the
1749 // compiler runtimes. This, in turn, should not happen. The only known case
1750 // when compiler runtime initialization fails is if there is not enough free
1751 // space in the code cache to generate the necessary stubs, etc.
1752 while (!is_compilation_disabled_forever()) {
1753 // We need this HandleMark to avoid leaking VM handles.
1754 HandleMark hm(thread);
1755
1756 // Check if the CodeCache is full
1757 int code_blob_type = 0;
1758 if (CodeCache::is_full(&code_blob_type)) {
1759 // The CodeHeap for code_blob_type is really full
1760 handle_full_code_cache(code_blob_type);
1761 }
1762
1763 CompileTask* task = queue->get();
1764 if (task == NULL) {
1765 continue;
1766 }
1767
1768 // Give compiler threads an extra quanta. They tend to be bursty and
1769 // this helps the compiler to finish up the job.
1770 if( CompilerThreadHintNoPreempt )
1771 os::hint_no_preempt();
1772
1773 // trace per thread time and compile statistics
1774 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1775 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1776
1777 // Assign the task to the current thread. Mark this compilation
1778 // thread as active for the profiler.
1779 CompileTaskWrapper ctw(task);
1780 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1781 task->set_code_handle(&result_handle);
1782 methodHandle method(thread, task->method());
1783
1784 // Never compile a method if breakpoints are present in it
1785 if (method()->number_of_breakpoints() == 0) {
1786 // Compile the method.
1787 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1788 #ifdef COMPILER1
1789 // Allow repeating compilations for the purpose of benchmarking
1790 // compile speed. This is not useful for customers.
1791 if (CompilationRepeat != 0) {
1792 int compile_count = CompilationRepeat;
1793 while (compile_count > 0) {
1794 invoke_compiler_on_method(task);
1795 nmethod* nm = method->code();
1796 if (nm != NULL) {
1797 nm->make_zombie();
1798 method->clear_code();
1799 }
1800 compile_count--;
1801 }
1802 }
1803 #endif /* COMPILER1 */
1804 invoke_compiler_on_method(task);
1805 } else {
1806 // After compilation is disabled, remove remaining methods from queue
1807 method->clear_queued_for_compilation();
1808 task->set_failure_reason("compilation is disabled");
1809 }
1810 }
1811 }
1812
1813 // Shut down compiler runtime
1814 shutdown_compiler_runtime(thread->compiler(), thread);
1815 }
1816
1817 // ------------------------------------------------------------------
1818 // CompileBroker::init_compiler_thread_log
1819 //
1820 // Set up state required by +LogCompilation.
1821 void CompileBroker::init_compiler_thread_log() {
1822 CompilerThread* thread = CompilerThread::current();
1823 char file_name[4*K];
1824 FILE* fp = NULL;
1825 intx thread_id = os::current_thread_id();
1826 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1827 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1828 if (dir == NULL) {
1829 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1830 thread_id, os::current_process_id());
1831 } else {
1832 jio_snprintf(file_name, sizeof(file_name),
1833 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1834 os::file_separator(), thread_id, os::current_process_id());
1835 }
1836
1837 fp = fopen(file_name, "at");
1838 if (fp != NULL) {
1839 if (LogCompilation && Verbose) {
1840 tty->print_cr("Opening compilation log %s", file_name);
1841 }
1842 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1843 thread->init_log(log);
1844
1845 if (xtty != NULL) {
1846 ttyLocker ttyl;
1847 // Record any per thread log files
1848 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1849 }
1850 return;
1851 }
1852 }
1853 warning("Cannot open log file: %s", file_name);
1854 }
1855
1856 // ------------------------------------------------------------------
1857 // CompileBroker::set_should_block
1858 //
1859 // Set _should_block.
1860 // Call this from the VM, with Threads_lock held and a safepoint requested.
1861 void CompileBroker::set_should_block() {
1862 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1863 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1864 #ifndef PRODUCT
1865 if (PrintCompilation && (Verbose || WizardMode))
1866 tty->print_cr("notifying compiler thread pool to block");
1867 #endif
1868 _should_block = true;
1869 }
1870
1871 // ------------------------------------------------------------------
1872 // CompileBroker::maybe_block
1873 //
1874 // Call this from the compiler at convenient points, to poll for _should_block.
1875 void CompileBroker::maybe_block() {
1876 if (_should_block) {
1877 #ifndef PRODUCT
1878 if (PrintCompilation && (Verbose || WizardMode))
1879 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1880 #endif
1881 ThreadInVMfromNative tivfn(JavaThread::current());
1882 }
1883 }
1884
1885 // wrapper for CodeCache::print_summary()
1886 static void codecache_print(bool detailed)
1887 {
1888 ResourceMark rm;
1889 stringStream s;
1890 // Dump code cache into a buffer before locking the tty,
1891 {
1892 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1893 CodeCache::print_summary(&s, detailed);
1894 }
1895 ttyLocker ttyl;
1896 tty->print("%s", s.as_string());
1897 }
1898
1899 // ------------------------------------------------------------------
1900 // CompileBroker::invoke_compiler_on_method
1901 //
1902 // Compile a method.
1903 //
1904 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1905 if (PrintCompilation) {
1906 ResourceMark rm;
1907 task->print_tty();
1908 }
1909 elapsedTimer time;
1910
1911 CompilerThread* thread = CompilerThread::current();
1912 ResourceMark rm(thread);
1913
1914 if (LogEvents) {
1915 _compilation_log->log_compile(thread, task);
1916 }
1917
1918 // Common flags.
1919 uint compile_id = task->compile_id();
1920 int osr_bci = task->osr_bci();
1921 bool is_osr = (osr_bci != standard_entry_bci);
1922 bool should_log = (thread->log() != NULL);
1923 bool should_break = false;
1924 int task_level = task->comp_level();
1925 {
1926 // create the handle inside it's own block so it can't
1927 // accidentally be referenced once the thread transitions to
1928 // native. The NoHandleMark before the transition should catch
1929 // any cases where this occurs in the future.
1930 methodHandle method(thread, task->method());
1931 should_break = check_break_at(method, compile_id, is_osr);
1932 if (should_log && !CompilerOracle::should_log(method)) {
1933 should_log = false;
1934 }
1935 assert(!method->is_native(), "no longer compile natives");
1936
1937 // Save information about this method in case of failure.
1938 set_last_compile(thread, method, is_osr, task_level);
1939
1940 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1941 }
1942
1943 // Allocate a new set of JNI handles.
1944 push_jni_handle_block();
1945 Method* target_handle = task->method();
1946 int compilable = ciEnv::MethodCompilable;
1947 {
1948 int system_dictionary_modification_counter;
1949 {
1950 MutexLocker locker(Compile_lock, thread);
1951 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1952 }
1953
1954 NoHandleMark nhm;
1955 ThreadToNativeFromVM ttn(thread);
1956
1957 ciEnv ci_env(task, system_dictionary_modification_counter);
1958 if (should_break) {
1959 ci_env.set_break_at_compile(true);
1960 }
1961 if (should_log) {
1962 ci_env.set_log(thread->log());
1963 }
1964 assert(thread->env() == &ci_env, "set by ci_env");
1965 // The thread-env() field is cleared in ~CompileTaskWrapper.
1966
1967 // Cache Jvmti state
1968 ci_env.cache_jvmti_state();
1969
1970 // Cache DTrace flags
1971 ci_env.cache_dtrace_flags();
1972
1973 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1974
1975 TraceTime t1("compilation", &time);
1976 EventCompilation event;
1977
1978 AbstractCompiler *comp = compiler(task_level);
1979 if (comp == NULL) {
1980 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1981 } else {
1982 comp->compile_method(&ci_env, target, osr_bci);
1983 }
1984
1985 if (!ci_env.failing() && task->code() == NULL) {
1986 //assert(false, "compiler should always document failure");
1987 // The compiler elected, without comment, not to register a result.
1988 // Do not attempt further compilations of this method.
1989 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1990 }
1991
1992 // Copy this bit to the enclosing block:
1993 compilable = ci_env.compilable();
1994
1995 if (ci_env.failing()) {
1996 task->set_failure_reason(ci_env.failure_reason());
1997 const char* retry_message = ci_env.retry_message();
1998 if (_compilation_log != NULL) {
1999 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2000 }
2001 if (PrintCompilation) {
2002 FormatBufferResource msg = retry_message != NULL ?
2003 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2004 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2005 task->print_compilation(tty, msg);
2006 }
2007 } else {
2008 task->mark_success();
2009 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2010 if (_compilation_log != NULL) {
2011 nmethod* code = task->code();
2012 if (code != NULL) {
2013 _compilation_log->log_nmethod(thread, code);
2014 }
2015 }
2016 }
2017 // simulate crash during compilation
2018 assert(task->compile_id() != CICrashAt, "just as planned");
2019 if (event.should_commit()) {
2020 event.set_method(target->get_Method());
2021 event.set_compileID(compile_id);
2022 event.set_compileLevel(task->comp_level());
2023 event.set_succeded(task->is_success());
2024 event.set_isOsr(is_osr);
2025 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2026 event.set_inlinedBytes(task->num_inlined_bytecodes());
2027 event.commit();
2028 }
2029 }
2030 pop_jni_handle_block();
2031
2032 methodHandle method(thread, task->method());
2033
2034 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2035
2036 collect_statistics(thread, time, task);
2037
2038 if (PrintCompilation && PrintCompilation2) {
2039 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2040 tty->print("%4d ", compile_id); // print compilation number
2041 tty->print("%s ", (is_osr ? "%" : " "));
2042 if (task->code() != NULL) {
2043 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2044 }
2045 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2046 }
2047
2048 if (PrintCodeCacheOnCompilation)
2049 codecache_print(/* detailed= */ false);
2050
2051 // Disable compilation, if required.
2052 switch (compilable) {
2053 case ciEnv::MethodCompilable_never:
2054 if (is_osr)
2055 method->set_not_osr_compilable_quietly();
2056 else
2057 method->set_not_compilable_quietly();
2058 break;
2059 case ciEnv::MethodCompilable_not_at_tier:
2060 if (is_osr)
2061 method->set_not_osr_compilable_quietly(task_level);
2062 else
2063 method->set_not_compilable_quietly(task_level);
2064 break;
2065 }
2066
2067 // Note that the queued_for_compilation bits are cleared without
2068 // protection of a mutex. [They were set by the requester thread,
2069 // when adding the task to the compile queue -- at which time the
2070 // compile queue lock was held. Subsequently, we acquired the compile
2071 // queue lock to get this task off the compile queue; thus (to belabour
2072 // the point somewhat) our clearing of the bits must be occurring
2073 // only after the setting of the bits. See also 14012000 above.
2074 method->clear_queued_for_compilation();
2075
2076 #ifdef ASSERT
2077 if (CollectedHeap::fired_fake_oom()) {
2078 // The current compile received a fake OOM during compilation so
2079 // go ahead and exit the VM since the test apparently succeeded
2080 tty->print_cr("*** Shutting down VM after successful fake OOM");
2081 vm_exit(0);
2082 }
2083 #endif
2084 }
2085
2086 /**
2087 * The CodeCache is full. Print out warning and disable compilation
2088 * or try code cache cleaning so compilation can continue later.
2089 */
2090 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2091 UseInterpreter = true;
2092 if (UseCompiler || AlwaysCompileLoopMethods ) {
2093 if (xtty != NULL) {
2094 ResourceMark rm;
2095 stringStream s;
2096 // Dump code cache state into a buffer before locking the tty,
2097 // because log_state() will use locks causing lock conflicts.
2098 CodeCache::log_state(&s);
2099 // Lock to prevent tearing
2100 ttyLocker ttyl;
2101 xtty->begin_elem("code_cache_full");
2102 xtty->print("%s", s.as_string());
2103 xtty->stamp();
2104 xtty->end_elem();
2105 }
2106
2107 #ifndef PRODUCT
2108 if (CompileTheWorld || ExitOnFullCodeCache) {
2109 codecache_print(/* detailed= */ true);
2110 before_exit(JavaThread::current());
2111 exit_globals(); // will delete tty
2112 vm_direct_exit(CompileTheWorld ? 0 : 1);
2113 }
2114 #endif
2115 if (UseCodeCacheFlushing) {
2116 // Since code cache is full, immediately stop new compiles
2117 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2118 NMethodSweeper::log_sweep("disable_compiler");
2119 }
2120 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2121 // without having to consider the state in which the current thread is.
2122 ThreadInVMfromUnknown in_vm;
2123 NMethodSweeper::possibly_sweep();
2124 } else {
2125 disable_compilation_forever();
2126 }
2127
2128 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2129 }
2130 }
2131
2132 // ------------------------------------------------------------------
2133 // CompileBroker::set_last_compile
2134 //
2135 // Record this compilation for debugging purposes.
2136 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2137 ResourceMark rm;
2138 char* method_name = method->name()->as_C_string();
2139 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2140 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2141 char current_method[CompilerCounters::cmname_buffer_length];
2142 size_t maxLen = CompilerCounters::cmname_buffer_length;
2143
2144 if (UsePerfData) {
2145 const char* class_name = method->method_holder()->name()->as_C_string();
2146
2147 size_t s1len = strlen(class_name);
2148 size_t s2len = strlen(method_name);
2149
2150 // check if we need to truncate the string
2151 if (s1len + s2len + 2 > maxLen) {
2152
2153 // the strategy is to lop off the leading characters of the
2154 // class name and the trailing characters of the method name.
2155
2156 if (s2len + 2 > maxLen) {
2157 // lop of the entire class name string, let snprintf handle
2158 // truncation of the method name.
2159 class_name += s1len; // null string
2160 }
2161 else {
2162 // lop off the extra characters from the front of the class name
2163 class_name += ((s1len + s2len + 2) - maxLen);
2164 }
2165 }
2166
2167 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2168 }
2169
2170 if (CICountOSR && is_osr) {
2171 _last_compile_type = osr_compile;
2172 } else {
2173 _last_compile_type = normal_compile;
2174 }
2175 _last_compile_level = comp_level;
2176
2177 if (UsePerfData) {
2178 CompilerCounters* counters = thread->counters();
2179 counters->set_current_method(current_method);
2180 counters->set_compile_type((jlong)_last_compile_type);
2181 }
2182 }
2183
2184
2185 // ------------------------------------------------------------------
2186 // CompileBroker::push_jni_handle_block
2187 //
2188 // Push on a new block of JNI handles.
2189 void CompileBroker::push_jni_handle_block() {
2190 JavaThread* thread = JavaThread::current();
2191
2192 // Allocate a new block for JNI handles.
2193 // Inlined code from jni_PushLocalFrame()
2194 JNIHandleBlock* java_handles = thread->active_handles();
2195 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2196 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2197 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2198 thread->set_active_handles(compile_handles);
2199 }
2200
2201
2202 // ------------------------------------------------------------------
2203 // CompileBroker::pop_jni_handle_block
2204 //
2205 // Pop off the current block of JNI handles.
2206 void CompileBroker::pop_jni_handle_block() {
2207 JavaThread* thread = JavaThread::current();
2208
2209 // Release our JNI handle block
2210 JNIHandleBlock* compile_handles = thread->active_handles();
2211 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2212 thread->set_active_handles(java_handles);
2213 compile_handles->set_pop_frame_link(NULL);
2214 JNIHandleBlock::release_block(compile_handles, thread); // may block
2215 }
2216
2217
2218 // ------------------------------------------------------------------
2219 // CompileBroker::check_break_at
2220 //
2221 // Should the compilation break at the current compilation.
2222 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2223 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2224 return true;
2225 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2226 return true;
2227 } else {
2228 return (compile_id == CIBreakAt);
2229 }
2230 }
2231
2232 // ------------------------------------------------------------------
2233 // CompileBroker::collect_statistics
2234 //
2235 // Collect statistics about the compilation.
2236
2237 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2238 bool success = task->is_success();
2239 methodHandle method (thread, task->method());
2240 uint compile_id = task->compile_id();
2241 bool is_osr = (task->osr_bci() != standard_entry_bci);
2242 nmethod* code = task->code();
2243 CompilerCounters* counters = thread->counters();
2244
2245 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2246 MutexLocker locker(CompileStatistics_lock);
2247
2248 // _perf variables are production performance counters which are
2249 // updated regardless of the setting of the CITime and CITimeEach flags
2250 //
2251 if (!success) {
2252 _total_bailout_count++;
2253 if (UsePerfData) {
2254 _perf_last_failed_method->set_value(counters->current_method());
2255 _perf_last_failed_type->set_value(counters->compile_type());
2256 _perf_total_bailout_count->inc();
2257 }
2258 } else if (code == NULL) {
2259 if (UsePerfData) {
2260 _perf_last_invalidated_method->set_value(counters->current_method());
2261 _perf_last_invalidated_type->set_value(counters->compile_type());
2262 _perf_total_invalidated_count->inc();
2263 }
2264 _total_invalidated_count++;
2265 } else {
2266 // Compilation succeeded
2267
2268 // update compilation ticks - used by the implementation of
2269 // java.lang.management.CompilationMBean
2270 _perf_total_compilation->inc(time.ticks());
2271
2272 _t_total_compilation.add(time);
2273 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2274
2275 if (CITime) {
2276 if (is_osr) {
2277 _t_osr_compilation.add(time);
2278 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2279 } else {
2280 _t_standard_compilation.add(time);
2281 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2282 }
2283 }
2284
2285 if (UsePerfData) {
2286 // save the name of the last method compiled
2287 _perf_last_method->set_value(counters->current_method());
2288 _perf_last_compile_type->set_value(counters->compile_type());
2289 _perf_last_compile_size->set_value(method->code_size() +
2290 task->num_inlined_bytecodes());
2291 if (is_osr) {
2292 _perf_osr_compilation->inc(time.ticks());
2293 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2294 } else {
2295 _perf_standard_compilation->inc(time.ticks());
2296 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2297 }
2298 }
2299
2300 if (CITimeEach) {
2301 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2302 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2303 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2304 }
2305
2306 // Collect counts of successful compilations
2307 _sum_nmethod_size += code->total_size();
2308 _sum_nmethod_code_size += code->insts_size();
2309 _total_compile_count++;
2310
2311 if (UsePerfData) {
2312 _perf_sum_nmethod_size->inc( code->total_size());
2313 _perf_sum_nmethod_code_size->inc(code->insts_size());
2314 _perf_total_compile_count->inc();
2315 }
2316
2317 if (is_osr) {
2318 if (UsePerfData) _perf_total_osr_compile_count->inc();
2319 _total_osr_compile_count++;
2320 } else {
2321 if (UsePerfData) _perf_total_standard_compile_count->inc();
2322 _total_standard_compile_count++;
2323 }
2324 }
2325 // set the current method for the thread to null
2326 if (UsePerfData) counters->set_current_method("");
2327 }
2328
2329 const char* CompileBroker::compiler_name(int comp_level) {
2330 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2331 if (comp == NULL) {
2332 return "no compiler";
2333 } else {
2334 return (comp->name());
2335 }
2336 }
2337
2338 void CompileBroker::print_times() {
2339 tty->cr();
2340 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2341 tty->print_cr("------------------------------------------------");
2342 //0000000000111111111122222222223333333333444444444455555555556666666666
2343 //0123456789012345678901234567890123456789012345678901234567890123456789
2344 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2345 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2346 CompileBroker::_t_standard_compilation.seconds(),
2347 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2348 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);
2349
2350 AbstractCompiler *comp = compiler(CompLevel_simple);
2351 if (comp != NULL) {
2352 comp->print_timers();
2353 }
2354 comp = compiler(CompLevel_full_optimization);
2355 if (comp != NULL) {
2356 comp->print_timers();
2357 }
2358 tty->cr();
2359 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2360 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2361 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2362 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2363 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2364 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2365 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2366 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2367 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2368 tty->cr();
2369 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2370 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2371 }
2372
2373 // Debugging output for failure
2374 void CompileBroker::print_last_compile() {
2375 if ( _last_compile_level != CompLevel_none &&
2376 compiler(_last_compile_level) != NULL &&
2377 _last_method_compiled != NULL &&
2378 _last_compile_type != no_compile) {
2379 if (_last_compile_type == osr_compile) {
2380 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2381 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2382 } else {
2383 tty->print_cr("Last parse: %d+++(%d) %s",
2384 _compilation_id, _last_compile_level, _last_method_compiled);
2385 }
2386 }
2387 }
2388
2389
2390 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2391 #ifndef PRODUCT
2392 st->print_cr("Compiler thread printing unimplemented.");
2393 st->cr();
2394 #endif
2395 }