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 = CompilationPolicy::policy()->select_task(this);
708 remove(task);
709 return task;
710 }
711
712 void CompileQueue::remove(CompileTask* task)
713 {
714 assert(lock()->owned_by_self(), "must own lock");
715 if (task->prev() != NULL) {
716 task->prev()->set_next(task->next());
717 } else {
718 // max is the first element
719 assert(task == _first, "Sanity");
720 _first = task->next();
721 }
722
723 if (task->next() != NULL) {
724 task->next()->set_prev(task->prev());
725 } else {
726 // max is the last element
727 assert(task == _last, "Sanity");
728 _last = task->prev();
729 }
730 --_size;
731 }
732
733 // methods in the compile queue need to be marked as used on the stack
734 // so that they don't get reclaimed by Redefine Classes
735 void CompileQueue::mark_on_stack() {
736 CompileTask* task = _first;
737 while (task != NULL) {
738 task->mark_on_stack();
739 task = task->next();
740 }
741 }
742
743 #ifndef PRODUCT
744 /**
745 * Print entire compilation queue.
746 */
747 void CompileQueue::print() {
748 if (CIPrintCompileQueue) {
749 ttyLocker ttyl;
750 tty->print_cr("Contents of %s", name());
751 tty->print_cr("----------------------");
752 CompileTask* task = _first;
753 while (task != NULL) {
754 task->print_line();
755 task = task->next();
756 }
757 tty->print_cr("----------------------");
758 }
759 }
760 #endif // PRODUCT
761
762 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
763
764 _current_method[0] = '\0';
765 _compile_type = CompileBroker::no_compile;
766
767 if (UsePerfData) {
768 ResourceMark rm;
769
770 // create the thread instance name space string - don't create an
771 // instance subspace if instance is -1 - keeps the adapterThread
772 // counters from having a ".0" namespace.
773 const char* thread_i = (instance == -1) ? thread_name :
774 PerfDataManager::name_space(thread_name, instance);
775
776
777 char* name = PerfDataManager::counter_name(thread_i, "method");
778 _perf_current_method =
779 PerfDataManager::create_string_variable(SUN_CI, name,
780 cmname_buffer_length,
781 _current_method, CHECK);
782
783 name = PerfDataManager::counter_name(thread_i, "type");
784 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
785 PerfData::U_None,
786 (jlong)_compile_type,
787 CHECK);
788
789 name = PerfDataManager::counter_name(thread_i, "time");
790 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
791 PerfData::U_Ticks, CHECK);
792
793 name = PerfDataManager::counter_name(thread_i, "compiles");
794 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
795 PerfData::U_Events, CHECK);
796 }
797 }
798
799 // ------------------------------------------------------------------
800 // CompileBroker::compilation_init
801 //
802 // Initialize the Compilation object
803 void CompileBroker::compilation_init() {
804 _last_method_compiled[0] = '\0';
805
806 // No need to initialize compilation system if we do not use it.
807 if (!UseCompiler) {
808 return;
809 }
810 #ifndef SHARK
811 // Set the interface to the current compiler(s).
812 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
813 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
814 #ifdef COMPILER1
815 if (c1_count > 0) {
816 _compilers[0] = new Compiler();
817 }
818 #endif // COMPILER1
819
820 #ifdef COMPILER2
821 if (c2_count > 0) {
822 _compilers[1] = new C2Compiler();
823 }
824 #endif // COMPILER2
825
826 #else // SHARK
827 int c1_count = 0;
828 int c2_count = 1;
829
830 _compilers[1] = new SharkCompiler();
831 #endif // SHARK
832
833 // Start the CompilerThreads
834 init_compiler_threads(c1_count, c2_count);
835 // totalTime performance counter is always created as it is required
836 // by the implementation of java.lang.management.CompilationMBean.
837 {
838 EXCEPTION_MARK;
839 _perf_total_compilation =
840 PerfDataManager::create_counter(JAVA_CI, "totalTime",
841 PerfData::U_Ticks, CHECK);
842 }
843
844
845 if (UsePerfData) {
846
847 EXCEPTION_MARK;
848
849 // create the jvmstat performance counters
850 _perf_osr_compilation =
851 PerfDataManager::create_counter(SUN_CI, "osrTime",
852 PerfData::U_Ticks, CHECK);
853
854 _perf_standard_compilation =
855 PerfDataManager::create_counter(SUN_CI, "standardTime",
856 PerfData::U_Ticks, CHECK);
857
858 _perf_total_bailout_count =
859 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
860 PerfData::U_Events, CHECK);
861
862 _perf_total_invalidated_count =
863 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
864 PerfData::U_Events, CHECK);
865
866 _perf_total_compile_count =
867 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
868 PerfData::U_Events, CHECK);
869 _perf_total_osr_compile_count =
870 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
871 PerfData::U_Events, CHECK);
872
873 _perf_total_standard_compile_count =
874 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
875 PerfData::U_Events, CHECK);
876
877 _perf_sum_osr_bytes_compiled =
878 PerfDataManager::create_counter(SUN_CI, "osrBytes",
879 PerfData::U_Bytes, CHECK);
880
881 _perf_sum_standard_bytes_compiled =
882 PerfDataManager::create_counter(SUN_CI, "standardBytes",
883 PerfData::U_Bytes, CHECK);
884
885 _perf_sum_nmethod_size =
886 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
887 PerfData::U_Bytes, CHECK);
888
889 _perf_sum_nmethod_code_size =
890 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
891 PerfData::U_Bytes, CHECK);
892
893 _perf_last_method =
894 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
895 CompilerCounters::cmname_buffer_length,
896 "", CHECK);
897
898 _perf_last_failed_method =
899 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
900 CompilerCounters::cmname_buffer_length,
901 "", CHECK);
902
903 _perf_last_invalidated_method =
904 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
905 CompilerCounters::cmname_buffer_length,
906 "", CHECK);
907
908 _perf_last_compile_type =
909 PerfDataManager::create_variable(SUN_CI, "lastType",
910 PerfData::U_None,
911 (jlong)CompileBroker::no_compile,
912 CHECK);
913
914 _perf_last_compile_size =
915 PerfDataManager::create_variable(SUN_CI, "lastSize",
916 PerfData::U_Bytes,
917 (jlong)CompileBroker::no_compile,
918 CHECK);
919
920
921 _perf_last_failed_type =
922 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
923 PerfData::U_None,
924 (jlong)CompileBroker::no_compile,
925 CHECK);
926
927 _perf_last_invalidated_type =
928 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
929 PerfData::U_None,
930 (jlong)CompileBroker::no_compile,
931 CHECK);
932 }
933
934 _initialized = true;
935 }
936
937
938 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
939 AbstractCompiler* comp, TRAPS) {
940 CompilerThread* compiler_thread = NULL;
941
942 Klass* k =
943 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
944 true, CHECK_0);
945 instanceKlassHandle klass (THREAD, k);
946 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
947 Handle string = java_lang_String::create_from_str(name, CHECK_0);
948
949 // Initialize thread_oop to put it into the system threadGroup
950 Handle thread_group (THREAD, Universe::system_thread_group());
951 JavaValue result(T_VOID);
952 JavaCalls::call_special(&result, thread_oop,
953 klass,
954 vmSymbols::object_initializer_name(),
955 vmSymbols::threadgroup_string_void_signature(),
956 thread_group,
957 string,
958 CHECK_0);
959
960 {
961 MutexLocker mu(Threads_lock, THREAD);
962 compiler_thread = new CompilerThread(queue, counters);
963 // At this point the new CompilerThread data-races with this startup
964 // thread (which I believe is the primoridal thread and NOT the VM
965 // thread). This means Java bytecodes being executed at startup can
966 // queue compile jobs which will run at whatever default priority the
967 // newly created CompilerThread runs at.
968
969
970 // At this point it may be possible that no osthread was created for the
971 // JavaThread due to lack of memory. We would have to throw an exception
972 // in that case. However, since this must work and we do not allow
973 // exceptions anyway, check and abort if this fails.
974
975 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
976 vm_exit_during_initialization("java.lang.OutOfMemoryError",
977 os::native_thread_creation_failed_msg());
978 }
979
980 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
981
982 // Note that this only sets the JavaThread _priority field, which by
983 // definition is limited to Java priorities and not OS priorities.
984 // The os-priority is set in the CompilerThread startup code itself
985
986 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
987
988 // Note that we cannot call os::set_priority because it expects Java
989 // priorities and we are *explicitly* using OS priorities so that it's
990 // possible to set the compiler thread priority higher than any Java
991 // thread.
992
993 int native_prio = CompilerThreadPriority;
994 if (native_prio == -1) {
995 if (UseCriticalCompilerThreadPriority) {
996 native_prio = os::java_to_os_priority[CriticalPriority];
997 } else {
998 native_prio = os::java_to_os_priority[NearMaxPriority];
999 }
1000 }
1001 os::set_native_priority(compiler_thread, native_prio);
1002
1003 java_lang_Thread::set_daemon(thread_oop());
1004
1005 compiler_thread->set_threadObj(thread_oop());
1006 compiler_thread->set_compiler(comp);
1007 Threads::add(compiler_thread);
1008 Thread::start(compiler_thread);
1009 }
1010
1011 // Let go of Threads_lock before yielding
1012 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1013
1014 return compiler_thread;
1015 }
1016
1017
1018 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1019 EXCEPTION_MARK;
1020 #if !defined(ZERO) && !defined(SHARK)
1021 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1022 #endif // !ZERO && !SHARK
1023 // Initialize the compilation queue
1024 if (c2_compiler_count > 0) {
1025 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1026 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1027 }
1028 if (c1_compiler_count > 0) {
1029 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1030 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1031 }
1032
1033 int compiler_count = c1_compiler_count + c2_compiler_count;
1034
1035 _compiler_threads =
1036 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1037
1038 char name_buffer[256];
1039 for (int i = 0; i < c2_compiler_count; i++) {
1040 // Create a name for our thread.
1041 sprintf(name_buffer, "C2 CompilerThread%d", i);
1042 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1043 // Shark and C2
1044 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1045 _compiler_threads->append(new_thread);
1046 }
1047
1048 for (int i = c2_compiler_count; i < compiler_count; i++) {
1049 // Create a name for our thread.
1050 sprintf(name_buffer, "C1 CompilerThread%d", i);
1051 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1052 // C1
1053 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1054 _compiler_threads->append(new_thread);
1055 }
1056
1057 if (UsePerfData) {
1058 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1059 }
1060 }
1061
1062
1063 /**
1064 * Set the methods on the stack as on_stack so that redefine classes doesn't
1065 * reclaim them. This method is executed at a safepoint.
1066 */
1067 void CompileBroker::mark_on_stack() {
1068 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1069 // Since we are at a safepoint, we do not need a lock to access
1070 // the compile queues.
1071 if (_c2_compile_queue != NULL) {
1072 _c2_compile_queue->mark_on_stack();
1073 }
1074 if (_c1_compile_queue != NULL) {
1075 _c1_compile_queue->mark_on_stack();
1076 }
1077 }
1078
1079 // ------------------------------------------------------------------
1080 // CompileBroker::compile_method
1081 //
1082 // Request compilation of a method.
1083 void CompileBroker::compile_method_base(methodHandle method,
1084 int osr_bci,
1085 int comp_level,
1086 methodHandle hot_method,
1087 int hot_count,
1088 const char* comment,
1089 Thread* thread) {
1090 // do nothing if compiler thread(s) is not available
1091 if (!_initialized) {
1092 return;
1093 }
1094
1095 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1096 assert(method->method_holder()->oop_is_instance(),
1097 "sanity check");
1098 assert(!method->method_holder()->is_not_initialized(),
1099 "method holder must be initialized");
1100 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1101
1102 if (CIPrintRequests) {
1103 tty->print("request: ");
1104 method->print_short_name(tty);
1105 if (osr_bci != InvocationEntryBci) {
1106 tty->print(" osr_bci: %d", osr_bci);
1107 }
1108 tty->print(" comment: %s count: %d", comment, hot_count);
1109 if (!hot_method.is_null()) {
1110 tty->print(" hot: ");
1111 if (hot_method() != method()) {
1112 hot_method->print_short_name(tty);
1113 } else {
1114 tty->print("yes");
1115 }
1116 }
1117 tty->cr();
1118 }
1119
1120 // A request has been made for compilation. Before we do any
1121 // real work, check to see if the method has been compiled
1122 // in the meantime with a definitive result.
1123 if (compilation_is_complete(method, osr_bci, comp_level)) {
1124 return;
1125 }
1126
1127 #ifndef PRODUCT
1128 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1129 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1130 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1131 return;
1132 }
1133 }
1134 #endif
1135
1136 // If this method is already in the compile queue, then
1137 // we do not block the current thread.
1138 if (compilation_is_in_queue(method)) {
1139 // We may want to decay our counter a bit here to prevent
1140 // multiple denied requests for compilation. This is an
1141 // open compilation policy issue. Note: The other possibility,
1142 // in the case that this is a blocking compile request, is to have
1143 // all subsequent blocking requesters wait for completion of
1144 // ongoing compiles. Note that in this case we'll need a protocol
1145 // for freeing the associated compile tasks. [Or we could have
1146 // a single static monitor on which all these waiters sleep.]
1147 return;
1148 }
1149
1150 // If the requesting thread is holding the pending list lock
1151 // then we just return. We can't risk blocking while holding
1152 // the pending list lock or a 3-way deadlock may occur
1153 // between the reference handler thread, a GC (instigated
1154 // by a compiler thread), and compiled method registration.
1155 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1156 return;
1157 }
1158
1159 // Outputs from the following MutexLocker block:
1160 CompileTask* task = NULL;
1161 bool blocking = false;
1162 CompileQueue* queue = compile_queue(comp_level);
1163
1164 // Acquire our lock.
1165 {
1166 MutexLocker locker(queue->lock(), thread);
1167
1168 // Make sure the method has not slipped into the queues since
1169 // last we checked; note that those checks were "fast bail-outs".
1170 // Here we need to be more careful, see 14012000 below.
1171 if (compilation_is_in_queue(method)) {
1172 return;
1173 }
1174
1175 // We need to check again to see if the compilation has
1176 // completed. A previous compilation may have registered
1177 // some result.
1178 if (compilation_is_complete(method, osr_bci, comp_level)) {
1179 return;
1180 }
1181
1182 // We now know that this compilation is not pending, complete,
1183 // or prohibited. Assign a compile_id to this compilation
1184 // and check to see if it is in our [Start..Stop) range.
1185 int compile_id = assign_compile_id(method, osr_bci);
1186 if (compile_id == 0) {
1187 // The compilation falls outside the allowed range.
1188 return;
1189 }
1190
1191 // Should this thread wait for completion of the compile?
1192 blocking = is_compile_blocking();
1193
1194 // We will enter the compilation in the queue.
1195 // 14012000: Note that this sets the queued_for_compile bits in
1196 // the target method. We can now reason that a method cannot be
1197 // queued for compilation more than once, as follows:
1198 // Before a thread queues a task for compilation, it first acquires
1199 // the compile queue lock, then checks if the method's queued bits
1200 // are set or it has already been compiled. Thus there can not be two
1201 // instances of a compilation task for the same method on the
1202 // compilation queue. Consider now the case where the compilation
1203 // thread has already removed a task for that method from the queue
1204 // and is in the midst of compiling it. In this case, the
1205 // queued_for_compile bits must be set in the method (and these
1206 // will be visible to the current thread, since the bits were set
1207 // under protection of the compile queue lock, which we hold now.
1208 // When the compilation completes, the compiler thread first sets
1209 // the compilation result and then clears the queued_for_compile
1210 // bits. Neither of these actions are protected by a barrier (or done
1211 // under the protection of a lock), so the only guarantee we have
1212 // (on machines with TSO (Total Store Order)) is that these values
1213 // will update in that order. As a result, the only combinations of
1214 // these bits that the current thread will see are, in temporal order:
1215 // <RESULT, QUEUE> :
1216 // <0, 1> : in compile queue, but not yet compiled
1217 // <1, 1> : compiled but queue bit not cleared
1218 // <1, 0> : compiled and queue bit cleared
1219 // Because we first check the queue bits then check the result bits,
1220 // we are assured that we cannot introduce a duplicate task.
1221 // Note that if we did the tests in the reverse order (i.e. check
1222 // result then check queued bit), we could get the result bit before
1223 // the compilation completed, and the queue bit after the compilation
1224 // completed, and end up introducing a "duplicate" (redundant) task.
1225 // In that case, the compiler thread should first check if a method
1226 // has already been compiled before trying to compile it.
1227 // NOTE: in the event that there are multiple compiler threads and
1228 // there is de-optimization/recompilation, things will get hairy,
1229 // and in that case it's best to protect both the testing (here) of
1230 // these bits, and their updating (here and elsewhere) under a
1231 // common lock.
1232 task = create_compile_task(queue,
1233 compile_id, method,
1234 osr_bci, comp_level,
1235 hot_method, hot_count, comment,
1236 blocking);
1237 }
1238
1239 if (blocking) {
1240 wait_for_completion(task);
1241 }
1242 }
1243
1244
1245 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1246 int comp_level,
1247 methodHandle hot_method, int hot_count,
1248 const char* comment, Thread* THREAD) {
1249 // make sure arguments make sense
1250 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1251 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1252 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1253 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1254 // allow any levels for WhiteBox
1255 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1256 // return quickly if possible
1257
1258 // lock, make sure that the compilation
1259 // isn't prohibited in a straightforward way.
1260 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1261 if (comp == NULL || !comp->can_compile_method(method) ||
1262 compilation_is_prohibited(method, osr_bci, comp_level)) {
1263 return NULL;
1264 }
1265
1266 if (osr_bci == InvocationEntryBci) {
1267 // standard compilation
1268 nmethod* method_code = method->code();
1269 if (method_code != NULL) {
1270 if (compilation_is_complete(method, osr_bci, comp_level)) {
1271 return method_code;
1272 }
1273 }
1274 if (method->is_not_compilable(comp_level)) {
1275 return NULL;
1276 }
1277 } else {
1278 // osr compilation
1279 #ifndef TIERED
1280 // seems like an assert of dubious value
1281 assert(comp_level == CompLevel_highest_tier,
1282 "all OSR compiles are assumed to be at a single compilation lavel");
1283 #endif // TIERED
1284 // We accept a higher level osr method
1285 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1286 if (nm != NULL) return nm;
1287 if (method->is_not_osr_compilable(comp_level)) return NULL;
1288 }
1289
1290 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1291 // some prerequisites that are compiler specific
1292 if (comp->is_c2() || comp->is_shark()) {
1293 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1294 // Resolve all classes seen in the signature of the method
1295 // we are compiling.
1296 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1297 }
1298
1299 // If the method is native, do the lookup in the thread requesting
1300 // the compilation. Native lookups can load code, which is not
1301 // permitted during compilation.
1302 //
1303 // Note: A native method implies non-osr compilation which is
1304 // checked with an assertion at the entry of this method.
1305 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1306 bool in_base_library;
1307 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1308 if (HAS_PENDING_EXCEPTION) {
1309 // In case of an exception looking up the method, we just forget
1310 // about it. The interpreter will kick-in and throw the exception.
1311 method->set_not_compilable(); // implies is_not_osr_compilable()
1312 CLEAR_PENDING_EXCEPTION;
1313 return NULL;
1314 }
1315 assert(method->has_native_function(), "must have native code by now");
1316 }
1317
1318 // RedefineClasses() has replaced this method; just return
1319 if (method->is_old()) {
1320 return NULL;
1321 }
1322
1323 // JVMTI -- post_compile_event requires jmethod_id() that may require
1324 // a lock the compiling thread can not acquire. Prefetch it here.
1325 if (JvmtiExport::should_post_compiled_method_load()) {
1326 method->jmethod_id();
1327 }
1328
1329 // do the compilation
1330 if (method->is_native()) {
1331 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1332 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1333 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1334 //
1335 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1336 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1337 AdapterHandlerLibrary::create_native_wrapper(method);
1338 } else {
1339 return NULL;
1340 }
1341 } else {
1342 // If the compiler is shut off due to code cache getting full
1343 // fail out now so blocking compiles dont hang the java thread
1344 if (!should_compile_new_jobs()) {
1345 CompilationPolicy::policy()->delay_compilation(method());
1346 return NULL;
1347 }
1348 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1349 }
1350
1351 // return requested nmethod
1352 // We accept a higher level osr method
1353 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1354 }
1355
1356
1357 // ------------------------------------------------------------------
1358 // CompileBroker::compilation_is_complete
1359 //
1360 // See if compilation of this method is already complete.
1361 bool CompileBroker::compilation_is_complete(methodHandle method,
1362 int osr_bci,
1363 int comp_level) {
1364 bool is_osr = (osr_bci != standard_entry_bci);
1365 if (is_osr) {
1366 if (method->is_not_osr_compilable(comp_level)) {
1367 return true;
1368 } else {
1369 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1370 return (result != NULL);
1371 }
1372 } else {
1373 if (method->is_not_compilable(comp_level)) {
1374 return true;
1375 } else {
1376 nmethod* result = method->code();
1377 if (result == NULL) return false;
1378 return comp_level == result->comp_level();
1379 }
1380 }
1381 }
1382
1383
1384 /**
1385 * See if this compilation is already requested.
1386 *
1387 * Implementation note: there is only a single "is in queue" bit
1388 * for each method. This means that the check below is overly
1389 * conservative in the sense that an osr compilation in the queue
1390 * will block a normal compilation from entering the queue (and vice
1391 * versa). This can be remedied by a full queue search to disambiguate
1392 * cases. If it is deemed profitable, this may be done.
1393 */
1394 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1395 return method->queued_for_compilation();
1396 }
1397
1398 // ------------------------------------------------------------------
1399 // CompileBroker::compilation_is_prohibited
1400 //
1401 // See if this compilation is not allowed.
1402 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1403 bool is_native = method->is_native();
1404 // Some compilers may not support the compilation of natives.
1405 AbstractCompiler *comp = compiler(comp_level);
1406 if (is_native &&
1407 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1408 method->set_not_compilable_quietly(comp_level);
1409 return true;
1410 }
1411
1412 bool is_osr = (osr_bci != standard_entry_bci);
1413 // Some compilers may not support on stack replacement.
1414 if (is_osr &&
1415 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1416 method->set_not_osr_compilable(comp_level);
1417 return true;
1418 }
1419
1420 // The method may be explicitly excluded by the user.
1421 bool quietly;
1422 if (CompilerOracle::should_exclude(method, quietly)) {
1423 if (!quietly) {
1424 // This does not happen quietly...
1425 ResourceMark rm;
1426 tty->print("### Excluding %s:%s",
1427 method->is_native() ? "generation of native wrapper" : "compile",
1428 (method->is_static() ? " static" : ""));
1429 method->print_short_name(tty);
1430 tty->cr();
1431 }
1432 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1433 }
1434
1435 return false;
1436 }
1437
1438 /**
1439 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1440 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1441 * The function also allows to generate separate compilation IDs for OSR compilations.
1442 */
1443 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1444 #ifdef ASSERT
1445 bool is_osr = (osr_bci != standard_entry_bci);
1446 int id;
1447 if (method->is_native()) {
1448 assert(!is_osr, "can't be osr");
1449 // Adapters, native wrappers and method handle intrinsics
1450 // should be generated always.
1451 return Atomic::add(1, &_compilation_id);
1452 } else if (CICountOSR && is_osr) {
1453 id = Atomic::add(1, &_osr_compilation_id);
1454 if (CIStartOSR <= id && id < CIStopOSR) {
1455 return id;
1456 }
1457 } else {
1458 id = Atomic::add(1, &_compilation_id);
1459 if (CIStart <= id && id < CIStop) {
1460 return id;
1461 }
1462 }
1463
1464 // Method was not in the appropriate compilation range.
1465 method->set_not_compilable_quietly();
1466 return 0;
1467 #else
1468 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1469 // only _compilation_id is incremented.
1470 return Atomic::add(1, &_compilation_id);
1471 #endif
1472 }
1473
1474 /**
1475 * Should the current thread block until this compilation request
1476 * has been fulfilled?
1477 */
1478 bool CompileBroker::is_compile_blocking() {
1479 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1480 return !BackgroundCompilation;
1481 }
1482
1483
1484 // ------------------------------------------------------------------
1485 // CompileBroker::preload_classes
1486 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1487 // Move this code over from c1_Compiler.cpp
1488 ShouldNotReachHere();
1489 }
1490
1491
1492 // ------------------------------------------------------------------
1493 // CompileBroker::create_compile_task
1494 //
1495 // Create a CompileTask object representing the current request for
1496 // compilation. Add this task to the queue.
1497 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1498 int compile_id,
1499 methodHandle method,
1500 int osr_bci,
1501 int comp_level,
1502 methodHandle hot_method,
1503 int hot_count,
1504 const char* comment,
1505 bool blocking) {
1506 CompileTask* new_task = CompileTask::allocate();
1507 new_task->initialize(compile_id, method, osr_bci, comp_level,
1508 hot_method, hot_count, comment,
1509 blocking);
1510 queue->add(new_task);
1511 return new_task;
1512 }
1513
1514
1515 /**
1516 * Wait for the compilation task to complete.
1517 */
1518 void CompileBroker::wait_for_completion(CompileTask* task) {
1519 if (CIPrintCompileQueue) {
1520 ttyLocker ttyl;
1521 tty->print_cr("BLOCKING FOR COMPILE");
1522 }
1523
1524 assert(task->is_blocking(), "can only wait on blocking task");
1525
1526 JavaThread* thread = JavaThread::current();
1527 thread->set_blocked_on_compilation(true);
1528
1529 methodHandle method(thread, task->method());
1530 {
1531 MutexLocker waiter(task->lock(), thread);
1532
1533 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1534 task->lock()->wait();
1535 }
1536 }
1537
1538 thread->set_blocked_on_compilation(false);
1539 if (is_compilation_disabled_forever()) {
1540 CompileTask::free(task);
1541 return;
1542 }
1543
1544 // It is harmless to check this status without the lock, because
1545 // completion is a stable property (until the task object is recycled).
1546 assert(task->is_complete(), "Compilation should have completed");
1547 assert(task->code_handle() == NULL, "must be reset");
1548
1549 // By convention, the waiter is responsible for recycling a
1550 // blocking CompileTask. Since there is only one waiter ever
1551 // waiting on a CompileTask, we know that no one else will
1552 // be using this CompileTask; we can free it.
1553 CompileTask::free(task);
1554 }
1555
1556 /**
1557 * Initialize compiler thread(s) + compiler object(s). The postcondition
1558 * of this function is that the compiler runtimes are initialized and that
1559 * compiler threads can start compiling.
1560 */
1561 bool CompileBroker::init_compiler_runtime() {
1562 CompilerThread* thread = CompilerThread::current();
1563 AbstractCompiler* comp = thread->compiler();
1564 // Final sanity check - the compiler object must exist
1565 guarantee(comp != NULL, "Compiler object must exist");
1566
1567 int system_dictionary_modification_counter;
1568 {
1569 MutexLocker locker(Compile_lock, thread);
1570 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1571 }
1572
1573 {
1574 // Must switch to native to allocate ci_env
1575 ThreadToNativeFromVM ttn(thread);
1576 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1577 // Cache Jvmti state
1578 ci_env.cache_jvmti_state();
1579 // Cache DTrace flags
1580 ci_env.cache_dtrace_flags();
1581
1582 // Switch back to VM state to do compiler initialization
1583 ThreadInVMfromNative tv(thread);
1584 ResetNoHandleMark rnhm;
1585
1586
1587 if (!comp->is_shark()) {
1588 // Perform per-thread and global initializations
1589 comp->initialize();
1590 }
1591 }
1592
1593 if (comp->is_failed()) {
1594 disable_compilation_forever();
1595 // If compiler initialization failed, no compiler thread that is specific to a
1596 // particular compiler runtime will ever start to compile methods.
1597 shutdown_compiler_runtime(comp, thread);
1598 return false;
1599 }
1600
1601 // C1 specific check
1602 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1603 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1604 return false;
1605 }
1606
1607 return true;
1608 }
1609
1610 /**
1611 * If C1 and/or C2 initialization failed, we shut down all compilation.
1612 * We do this to keep things simple. This can be changed if it ever turns
1613 * out to be a problem.
1614 */
1615 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1616 // Free buffer blob, if allocated
1617 if (thread->get_buffer_blob() != NULL) {
1618 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1619 CodeCache::free(thread->get_buffer_blob());
1620 }
1621
1622 if (comp->should_perform_shutdown()) {
1623 // There are two reasons for shutting down the compiler
1624 // 1) compiler runtime initialization failed
1625 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1626 warning("%s initialization failed. Shutting down all compilers", comp->name());
1627
1628 // Only one thread per compiler runtime object enters here
1629 // Set state to shut down
1630 comp->set_shut_down();
1631
1632 // Delete all queued compilation tasks to make compiler threads exit faster.
1633 if (_c1_compile_queue != NULL) {
1634 _c1_compile_queue->free_all();
1635 }
1636
1637 if (_c2_compile_queue != NULL) {
1638 _c2_compile_queue->free_all();
1639 }
1640
1641 // Set flags so that we continue execution with using interpreter only.
1642 UseCompiler = false;
1643 UseInterpreter = true;
1644
1645 // We could delete compiler runtimes also. However, there are references to
1646 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1647 // fail. This can be done later if necessary.
1648 }
1649 }
1650
1651 // ------------------------------------------------------------------
1652 // CompileBroker::compiler_thread_loop
1653 //
1654 // The main loop run by a CompilerThread.
1655 void CompileBroker::compiler_thread_loop() {
1656 CompilerThread* thread = CompilerThread::current();
1657 CompileQueue* queue = thread->queue();
1658 // For the thread that initializes the ciObjectFactory
1659 // this resource mark holds all the shared objects
1660 ResourceMark rm;
1661
1662 // First thread to get here will initialize the compiler interface
1663
1664 if (!ciObjectFactory::is_initialized()) {
1665 ASSERT_IN_VM;
1666 MutexLocker only_one (CompileThread_lock, thread);
1667 if (!ciObjectFactory::is_initialized()) {
1668 ciObjectFactory::initialize();
1669 }
1670 }
1671
1672 // Open a log.
1673 if (LogCompilation) {
1674 init_compiler_thread_log();
1675 }
1676 CompileLog* log = thread->log();
1677 if (log != NULL) {
1678 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1679 thread->name(),
1680 os::current_thread_id(),
1681 os::current_process_id());
1682 log->stamp();
1683 log->end_elem();
1684 }
1685
1686 // If compiler thread/runtime initialization fails, exit the compiler thread
1687 if (!init_compiler_runtime()) {
1688 return;
1689 }
1690
1691 // Poll for new compilation tasks as long as the JVM runs. Compilation
1692 // should only be disabled if something went wrong while initializing the
1693 // compiler runtimes. This, in turn, should not happen. The only known case
1694 // when compiler runtime initialization fails is if there is not enough free
1695 // space in the code cache to generate the necessary stubs, etc.
1696 while (!is_compilation_disabled_forever()) {
1697 // We need this HandleMark to avoid leaking VM handles.
1698 HandleMark hm(thread);
1699
1700 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1701 // the code cache is really full
1702 handle_full_code_cache();
1703 }
1704
1705 CompileTask* task = queue->get();
1706 if (task == NULL) {
1707 continue;
1708 }
1709
1710 // Give compiler threads an extra quanta. They tend to be bursty and
1711 // this helps the compiler to finish up the job.
1712 if( CompilerThreadHintNoPreempt )
1713 os::hint_no_preempt();
1714
1715 // trace per thread time and compile statistics
1716 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1717 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1718
1719 // Assign the task to the current thread. Mark this compilation
1720 // thread as active for the profiler.
1721 CompileTaskWrapper ctw(task);
1722 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1723 task->set_code_handle(&result_handle);
1724 methodHandle method(thread, task->method());
1725
1726 // Never compile a method if breakpoints are present in it
1727 if (method()->number_of_breakpoints() == 0) {
1728 // Compile the method.
1729 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1730 #ifdef COMPILER1
1731 // Allow repeating compilations for the purpose of benchmarking
1732 // compile speed. This is not useful for customers.
1733 if (CompilationRepeat != 0) {
1734 int compile_count = CompilationRepeat;
1735 while (compile_count > 0) {
1736 invoke_compiler_on_method(task);
1737 nmethod* nm = method->code();
1738 if (nm != NULL) {
1739 nm->make_zombie();
1740 method->clear_code();
1741 }
1742 compile_count--;
1743 }
1744 }
1745 #endif /* COMPILER1 */
1746 invoke_compiler_on_method(task);
1747 } else {
1748 // After compilation is disabled, remove remaining methods from queue
1749 method->clear_queued_for_compilation();
1750 }
1751 }
1752 }
1753
1754 // Shut down compiler runtime
1755 shutdown_compiler_runtime(thread->compiler(), thread);
1756 }
1757
1758 // ------------------------------------------------------------------
1759 // CompileBroker::init_compiler_thread_log
1760 //
1761 // Set up state required by +LogCompilation.
1762 void CompileBroker::init_compiler_thread_log() {
1763 CompilerThread* thread = CompilerThread::current();
1764 char file_name[4*K];
1765 FILE* fp = NULL;
1766 intx thread_id = os::current_thread_id();
1767 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1768 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1769 if (dir == NULL) {
1770 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1771 thread_id, os::current_process_id());
1772 } else {
1773 jio_snprintf(file_name, sizeof(file_name),
1774 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1775 os::file_separator(), thread_id, os::current_process_id());
1776 }
1777
1778 fp = fopen(file_name, "at");
1779 if (fp != NULL) {
1780 if (LogCompilation && Verbose) {
1781 tty->print_cr("Opening compilation log %s", file_name);
1782 }
1783 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1784 thread->init_log(log);
1785
1786 if (xtty != NULL) {
1787 ttyLocker ttyl;
1788 // Record any per thread log files
1789 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name);
1790 }
1791 return;
1792 }
1793 }
1794 warning("Cannot open log file: %s", file_name);
1795 }
1796
1797 // ------------------------------------------------------------------
1798 // CompileBroker::set_should_block
1799 //
1800 // Set _should_block.
1801 // Call this from the VM, with Threads_lock held and a safepoint requested.
1802 void CompileBroker::set_should_block() {
1803 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1804 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1805 #ifndef PRODUCT
1806 if (PrintCompilation && (Verbose || WizardMode))
1807 tty->print_cr("notifying compiler thread pool to block");
1808 #endif
1809 _should_block = true;
1810 }
1811
1812 // ------------------------------------------------------------------
1813 // CompileBroker::maybe_block
1814 //
1815 // Call this from the compiler at convenient points, to poll for _should_block.
1816 void CompileBroker::maybe_block() {
1817 if (_should_block) {
1818 #ifndef PRODUCT
1819 if (PrintCompilation && (Verbose || WizardMode))
1820 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1821 #endif
1822 ThreadInVMfromNative tivfn(JavaThread::current());
1823 }
1824 }
1825
1826 // wrapper for CodeCache::print_summary()
1827 static void codecache_print(bool detailed)
1828 {
1829 ResourceMark rm;
1830 stringStream s;
1831 // Dump code cache into a buffer before locking the tty,
1832 {
1833 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1834 CodeCache::print_summary(&s, detailed);
1835 }
1836 ttyLocker ttyl;
1837 tty->print(s.as_string());
1838 }
1839
1840 // ------------------------------------------------------------------
1841 // CompileBroker::invoke_compiler_on_method
1842 //
1843 // Compile a method.
1844 //
1845 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1846 if (PrintCompilation) {
1847 ResourceMark rm;
1848 task->print_line();
1849 }
1850 elapsedTimer time;
1851
1852 CompilerThread* thread = CompilerThread::current();
1853 ResourceMark rm(thread);
1854
1855 if (LogEvents) {
1856 _compilation_log->log_compile(thread, task);
1857 }
1858
1859 // Common flags.
1860 uint compile_id = task->compile_id();
1861 int osr_bci = task->osr_bci();
1862 bool is_osr = (osr_bci != standard_entry_bci);
1863 bool should_log = (thread->log() != NULL);
1864 bool should_break = false;
1865 int task_level = task->comp_level();
1866 {
1867 // create the handle inside it's own block so it can't
1868 // accidentally be referenced once the thread transitions to
1869 // native. The NoHandleMark before the transition should catch
1870 // any cases where this occurs in the future.
1871 methodHandle method(thread, task->method());
1872 should_break = check_break_at(method, compile_id, is_osr);
1873 if (should_log && !CompilerOracle::should_log(method)) {
1874 should_log = false;
1875 }
1876 assert(!method->is_native(), "no longer compile natives");
1877
1878 // Save information about this method in case of failure.
1879 set_last_compile(thread, method, is_osr, task_level);
1880
1881 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1882 }
1883
1884 // Allocate a new set of JNI handles.
1885 push_jni_handle_block();
1886 Method* target_handle = task->method();
1887 int compilable = ciEnv::MethodCompilable;
1888 {
1889 int system_dictionary_modification_counter;
1890 {
1891 MutexLocker locker(Compile_lock, thread);
1892 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1893 }
1894
1895 NoHandleMark nhm;
1896 ThreadToNativeFromVM ttn(thread);
1897
1898 ciEnv ci_env(task, system_dictionary_modification_counter);
1899 if (should_break) {
1900 ci_env.set_break_at_compile(true);
1901 }
1902 if (should_log) {
1903 ci_env.set_log(thread->log());
1904 }
1905 assert(thread->env() == &ci_env, "set by ci_env");
1906 // The thread-env() field is cleared in ~CompileTaskWrapper.
1907
1908 // Cache Jvmti state
1909 ci_env.cache_jvmti_state();
1910
1911 // Cache DTrace flags
1912 ci_env.cache_dtrace_flags();
1913
1914 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1915
1916 TraceTime t1("compilation", &time);
1917 EventCompilation event;
1918
1919 AbstractCompiler *comp = compiler(task_level);
1920 if (comp == NULL) {
1921 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1922 } else {
1923 comp->compile_method(&ci_env, target, osr_bci);
1924 }
1925
1926 if (!ci_env.failing() && task->code() == NULL) {
1927 //assert(false, "compiler should always document failure");
1928 // The compiler elected, without comment, not to register a result.
1929 // Do not attempt further compilations of this method.
1930 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1931 }
1932
1933 // Copy this bit to the enclosing block:
1934 compilable = ci_env.compilable();
1935
1936 if (ci_env.failing()) {
1937 const char* retry_message = ci_env.retry_message();
1938 if (_compilation_log != NULL) {
1939 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1940 }
1941 if (PrintCompilation) {
1942 FormatBufferResource msg = retry_message != NULL ?
1943 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1944 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
1945 task->print_compilation(tty, msg);
1946 }
1947 } else {
1948 task->mark_success();
1949 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1950 if (_compilation_log != NULL) {
1951 nmethod* code = task->code();
1952 if (code != NULL) {
1953 _compilation_log->log_nmethod(thread, code);
1954 }
1955 }
1956 }
1957 // simulate crash during compilation
1958 assert(task->compile_id() != CICrashAt, "just as planned");
1959 if (event.should_commit()) {
1960 event.set_method(target->get_Method());
1961 event.set_compileID(compile_id);
1962 event.set_compileLevel(task->comp_level());
1963 event.set_succeded(task->is_success());
1964 event.set_isOsr(is_osr);
1965 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1966 event.set_inlinedBytes(task->num_inlined_bytecodes());
1967 event.commit();
1968 }
1969 }
1970 pop_jni_handle_block();
1971
1972 methodHandle method(thread, task->method());
1973
1974 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1975
1976 collect_statistics(thread, time, task);
1977
1978 if (PrintCompilation && PrintCompilation2) {
1979 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
1980 tty->print("%4d ", compile_id); // print compilation number
1981 tty->print("%s ", (is_osr ? "%" : " "));
1982 if (task->code() != NULL) {
1983 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1984 }
1985 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1986 }
1987
1988 if (PrintCodeCacheOnCompilation)
1989 codecache_print(/* detailed= */ false);
1990
1991 // Disable compilation, if required.
1992 switch (compilable) {
1993 case ciEnv::MethodCompilable_never:
1994 if (is_osr)
1995 method->set_not_osr_compilable_quietly();
1996 else
1997 method->set_not_compilable_quietly();
1998 break;
1999 case ciEnv::MethodCompilable_not_at_tier:
2000 if (is_osr)
2001 method->set_not_osr_compilable_quietly(task_level);
2002 else
2003 method->set_not_compilable_quietly(task_level);
2004 break;
2005 }
2006
2007 // Note that the queued_for_compilation bits are cleared without
2008 // protection of a mutex. [They were set by the requester thread,
2009 // when adding the task to the complie queue -- at which time the
2010 // compile queue lock was held. Subsequently, we acquired the compile
2011 // queue lock to get this task off the compile queue; thus (to belabour
2012 // the point somewhat) our clearing of the bits must be occurring
2013 // only after the setting of the bits. See also 14012000 above.
2014 method->clear_queued_for_compilation();
2015
2016 #ifdef ASSERT
2017 if (CollectedHeap::fired_fake_oom()) {
2018 // The current compile received a fake OOM during compilation so
2019 // go ahead and exit the VM since the test apparently succeeded
2020 tty->print_cr("*** Shutting down VM after successful fake OOM");
2021 vm_exit(0);
2022 }
2023 #endif
2024 }
2025
2026 /**
2027 * The CodeCache is full. Print out warning and disable compilation
2028 * or try code cache cleaning so compilation can continue later.
2029 */
2030 void CompileBroker::handle_full_code_cache() {
2031 UseInterpreter = true;
2032 if (UseCompiler || AlwaysCompileLoopMethods ) {
2033 if (xtty != NULL) {
2034 ResourceMark rm;
2035 stringStream s;
2036 // Dump code cache state into a buffer before locking the tty,
2037 // because log_state() will use locks causing lock conflicts.
2038 CodeCache::log_state(&s);
2039 // Lock to prevent tearing
2040 ttyLocker ttyl;
2041 xtty->begin_elem("code_cache_full");
2042 xtty->print(s.as_string());
2043 xtty->stamp();
2044 xtty->end_elem();
2045 }
2046
2047 CodeCache::report_codemem_full();
2048
2049 #ifndef PRODUCT
2050 if (CompileTheWorld || ExitOnFullCodeCache) {
2051 codecache_print(/* detailed= */ true);
2052 before_exit(JavaThread::current());
2053 exit_globals(); // will delete tty
2054 vm_direct_exit(CompileTheWorld ? 0 : 1);
2055 }
2056 #endif
2057 if (UseCodeCacheFlushing) {
2058 // Since code cache is full, immediately stop new compiles
2059 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2060 NMethodSweeper::log_sweep("disable_compiler");
2061 }
2062 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2063 // without having to consider the state in which the current thread is.
2064 ThreadInVMfromUnknown in_vm;
2065 NMethodSweeper::possibly_sweep();
2066 } else {
2067 disable_compilation_forever();
2068 }
2069
2070 // Print warning only once
2071 if (should_print_compiler_warning()) {
2072 warning("CodeCache is full. Compiler has been disabled.");
2073 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2074 codecache_print(/* detailed= */ true);
2075 }
2076 }
2077 }
2078
2079 // ------------------------------------------------------------------
2080 // CompileBroker::set_last_compile
2081 //
2082 // Record this compilation for debugging purposes.
2083 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2084 ResourceMark rm;
2085 char* method_name = method->name()->as_C_string();
2086 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2087 char current_method[CompilerCounters::cmname_buffer_length];
2088 size_t maxLen = CompilerCounters::cmname_buffer_length;
2089
2090 if (UsePerfData) {
2091 const char* class_name = method->method_holder()->name()->as_C_string();
2092
2093 size_t s1len = strlen(class_name);
2094 size_t s2len = strlen(method_name);
2095
2096 // check if we need to truncate the string
2097 if (s1len + s2len + 2 > maxLen) {
2098
2099 // the strategy is to lop off the leading characters of the
2100 // class name and the trailing characters of the method name.
2101
2102 if (s2len + 2 > maxLen) {
2103 // lop of the entire class name string, let snprintf handle
2104 // truncation of the method name.
2105 class_name += s1len; // null string
2106 }
2107 else {
2108 // lop off the extra characters from the front of the class name
2109 class_name += ((s1len + s2len + 2) - maxLen);
2110 }
2111 }
2112
2113 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2114 }
2115
2116 if (CICountOSR && is_osr) {
2117 _last_compile_type = osr_compile;
2118 } else {
2119 _last_compile_type = normal_compile;
2120 }
2121 _last_compile_level = comp_level;
2122
2123 if (UsePerfData) {
2124 CompilerCounters* counters = thread->counters();
2125 counters->set_current_method(current_method);
2126 counters->set_compile_type((jlong)_last_compile_type);
2127 }
2128 }
2129
2130
2131 // ------------------------------------------------------------------
2132 // CompileBroker::push_jni_handle_block
2133 //
2134 // Push on a new block of JNI handles.
2135 void CompileBroker::push_jni_handle_block() {
2136 JavaThread* thread = JavaThread::current();
2137
2138 // Allocate a new block for JNI handles.
2139 // Inlined code from jni_PushLocalFrame()
2140 JNIHandleBlock* java_handles = thread->active_handles();
2141 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2142 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2143 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2144 thread->set_active_handles(compile_handles);
2145 }
2146
2147
2148 // ------------------------------------------------------------------
2149 // CompileBroker::pop_jni_handle_block
2150 //
2151 // Pop off the current block of JNI handles.
2152 void CompileBroker::pop_jni_handle_block() {
2153 JavaThread* thread = JavaThread::current();
2154
2155 // Release our JNI handle block
2156 JNIHandleBlock* compile_handles = thread->active_handles();
2157 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2158 thread->set_active_handles(java_handles);
2159 compile_handles->set_pop_frame_link(NULL);
2160 JNIHandleBlock::release_block(compile_handles, thread); // may block
2161 }
2162
2163
2164 // ------------------------------------------------------------------
2165 // CompileBroker::check_break_at
2166 //
2167 // Should the compilation break at the current compilation.
2168 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2169 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2170 return true;
2171 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2172 return true;
2173 } else {
2174 return (compile_id == CIBreakAt);
2175 }
2176 }
2177
2178 // ------------------------------------------------------------------
2179 // CompileBroker::collect_statistics
2180 //
2181 // Collect statistics about the compilation.
2182
2183 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2184 bool success = task->is_success();
2185 methodHandle method (thread, task->method());
2186 uint compile_id = task->compile_id();
2187 bool is_osr = (task->osr_bci() != standard_entry_bci);
2188 nmethod* code = task->code();
2189 CompilerCounters* counters = thread->counters();
2190
2191 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2192 MutexLocker locker(CompileStatistics_lock);
2193
2194 // _perf variables are production performance counters which are
2195 // updated regardless of the setting of the CITime and CITimeEach flags
2196 //
2197 if (!success) {
2198 _total_bailout_count++;
2199 if (UsePerfData) {
2200 _perf_last_failed_method->set_value(counters->current_method());
2201 _perf_last_failed_type->set_value(counters->compile_type());
2202 _perf_total_bailout_count->inc();
2203 }
2204 } else if (code == NULL) {
2205 if (UsePerfData) {
2206 _perf_last_invalidated_method->set_value(counters->current_method());
2207 _perf_last_invalidated_type->set_value(counters->compile_type());
2208 _perf_total_invalidated_count->inc();
2209 }
2210 _total_invalidated_count++;
2211 } else {
2212 // Compilation succeeded
2213
2214 // update compilation ticks - used by the implementation of
2215 // java.lang.management.CompilationMBean
2216 _perf_total_compilation->inc(time.ticks());
2217
2218 _t_total_compilation.add(time);
2219 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2220
2221 if (CITime) {
2222 if (is_osr) {
2223 _t_osr_compilation.add(time);
2224 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2225 } else {
2226 _t_standard_compilation.add(time);
2227 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2228 }
2229 }
2230
2231 if (UsePerfData) {
2232 // save the name of the last method compiled
2233 _perf_last_method->set_value(counters->current_method());
2234 _perf_last_compile_type->set_value(counters->compile_type());
2235 _perf_last_compile_size->set_value(method->code_size() +
2236 task->num_inlined_bytecodes());
2237 if (is_osr) {
2238 _perf_osr_compilation->inc(time.ticks());
2239 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2240 } else {
2241 _perf_standard_compilation->inc(time.ticks());
2242 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2243 }
2244 }
2245
2246 if (CITimeEach) {
2247 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2248 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2249 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2250 }
2251
2252 // Collect counts of successful compilations
2253 _sum_nmethod_size += code->total_size();
2254 _sum_nmethod_code_size += code->insts_size();
2255 _total_compile_count++;
2256
2257 if (UsePerfData) {
2258 _perf_sum_nmethod_size->inc( code->total_size());
2259 _perf_sum_nmethod_code_size->inc(code->insts_size());
2260 _perf_total_compile_count->inc();
2261 }
2262
2263 if (is_osr) {
2264 if (UsePerfData) _perf_total_osr_compile_count->inc();
2265 _total_osr_compile_count++;
2266 } else {
2267 if (UsePerfData) _perf_total_standard_compile_count->inc();
2268 _total_standard_compile_count++;
2269 }
2270 }
2271 // set the current method for the thread to null
2272 if (UsePerfData) counters->set_current_method("");
2273 }
2274
2275 const char* CompileBroker::compiler_name(int comp_level) {
2276 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2277 if (comp == NULL) {
2278 return "no compiler";
2279 } else {
2280 return (comp->name());
2281 }
2282 }
2283
2284 void CompileBroker::print_times() {
2285 tty->cr();
2286 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2287 tty->print_cr("------------------------------------------------");
2288 //0000000000111111111122222222223333333333444444444455555555556666666666
2289 //0123456789012345678901234567890123456789012345678901234567890123456789
2290 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2291 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2292 CompileBroker::_t_standard_compilation.seconds(),
2293 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2294 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);
2295
2296 AbstractCompiler *comp = compiler(CompLevel_simple);
2297 if (comp != NULL) {
2298 comp->print_timers();
2299 }
2300 comp = compiler(CompLevel_full_optimization);
2301 if (comp != NULL) {
2302 comp->print_timers();
2303 }
2304 tty->cr();
2305 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2306 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2307 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2308 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2309 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2310 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2311 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2312 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2313 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2314 tty->cr();
2315 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2316 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2317 }
2318
2319 // Debugging output for failure
2320 void CompileBroker::print_last_compile() {
2321 if ( _last_compile_level != CompLevel_none &&
2322 compiler(_last_compile_level) != NULL &&
2323 _last_method_compiled != NULL &&
2324 _last_compile_type != no_compile) {
2325 if (_last_compile_type == osr_compile) {
2326 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2327 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2328 } else {
2329 tty->print_cr("Last parse: %d+++(%d) %s",
2330 _compilation_id, _last_compile_level, _last_method_compiled);
2331 }
2332 }
2333 }
2334
2335
2336 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2337 #ifndef PRODUCT
2338 st->print_cr("Compiler thread printing unimplemented.");
2339 st->cr();
2340 #endif
2341 }