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 "prims/whitebox.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/atomic.inline.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/interfaceSupport.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/sweeper.hpp"
48 #include "trace/tracing.hpp"
49 #include "utilities/dtrace.hpp"
50 #include "utilities/events.hpp"
51 #ifdef COMPILER1
52 #include "c1/c1_Compiler.hpp"
53 #endif
54 #ifdef COMPILER2
55 #include "opto/c2compiler.hpp"
56 #endif
57 #ifdef SHARK
58 #include "shark/sharkCompiler.hpp"
59 #endif
60
61 #ifdef DTRACE_ENABLED
62
63 // Only bother with this argument setup if dtrace is available
64
65 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
66 { \
67 Symbol* klass_name = (method)->klass_name(); \
68 Symbol* name = (method)->name(); \
69 Symbol* signature = (method)->signature(); \
70 HOTSPOT_METHOD_COMPILE_BEGIN( \
71 (char *) comp_name, strlen(comp_name), \
72 (char *) klass_name->bytes(), klass_name->utf8_length(), \
73 (char *) name->bytes(), name->utf8_length(), \
74 (char *) signature->bytes(), signature->utf8_length()); \
75 }
76
77 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
78 { \
79 Symbol* klass_name = (method)->klass_name(); \
80 Symbol* name = (method)->name(); \
81 Symbol* signature = (method)->signature(); \
82 HOTSPOT_METHOD_COMPILE_END( \
83 (char *) comp_name, strlen(comp_name), \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length(), (success)); \
87 }
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
92 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
93
94 #endif // ndef DTRACE_ENABLED
95
96 bool CompileBroker::_initialized = false;
97 volatile bool CompileBroker::_should_block = false;
98 volatile jint CompileBroker::_print_compilation_warning = 0;
99 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
100
101 // The installed compiler(s)
102 AbstractCompiler* CompileBroker::_compilers[2];
103
104 // These counters are used to assign an unique ID to each compilation.
105 volatile jint CompileBroker::_compilation_id = 0;
106 volatile jint CompileBroker::_osr_compilation_id = 0;
107
108 // Debugging information
109 int CompileBroker::_last_compile_type = no_compile;
110 int CompileBroker::_last_compile_level = CompLevel_none;
111 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
112
113 // Performance counters
114 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
115 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
116 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
117
118 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
119 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
121 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
122 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
123
124 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
125 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
126 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
127 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
128
129 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
130 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
131 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
132 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
133 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
134 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
135 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
136
137 // Timers and counters for generating statistics
138 elapsedTimer CompileBroker::_t_total_compilation;
139 elapsedTimer CompileBroker::_t_osr_compilation;
140 elapsedTimer CompileBroker::_t_standard_compilation;
141 elapsedTimer CompileBroker::_t_invalidated_compilation;
142 elapsedTimer CompileBroker::_t_bailedout_compilation;
143
144 int CompileBroker::_total_bailout_count = 0;
145 int CompileBroker::_total_invalidated_count = 0;
146 int CompileBroker::_total_compile_count = 0;
147 int CompileBroker::_total_osr_compile_count = 0;
148 int CompileBroker::_total_standard_compile_count = 0;
149
150 int CompileBroker::_sum_osr_bytes_compiled = 0;
151 int CompileBroker::_sum_standard_bytes_compiled = 0;
152 int CompileBroker::_sum_nmethod_size = 0;
153 int CompileBroker::_sum_nmethod_code_size = 0;
154
155 long CompileBroker::_peak_compilation_time = 0;
156
157 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
158 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
159
160
161 class CompilationLog : public StringEventLog {
162 public:
163 CompilationLog() : StringEventLog("Compilation events") {
164 }
165
166 void log_compile(JavaThread* thread, CompileTask* task) {
167 StringLogMessage lm;
168 stringStream sstr = lm.stream();
169 // msg.time_stamp().update_to(tty->time_stamp().ticks());
170 task->print_compilation(&sstr, NULL, true, false);
171 log(thread, "%s", (const char*)lm);
172 }
173
174 void log_nmethod(JavaThread* thread, nmethod* nm) {
175 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
176 nm->compile_id(), nm->is_osr_method() ? "%" : "",
177 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
178 }
179
180 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
181 StringLogMessage lm;
182 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
183 if (retry_message != NULL) {
184 lm.append(" (%s)", retry_message);
185 }
186 lm.print("\n");
187 log(thread, "%s", (const char*)lm);
188 }
189
190 void log_metaspace_failure(const char* reason) {
191 ResourceMark rm;
192 StringLogMessage lm;
193 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
194 lm.print("\n");
195 log(JavaThread::current(), "%s", (const char*)lm);
196 }
197 };
198
199 static CompilationLog* _compilation_log = NULL;
200
201 void compileBroker_init() {
202 if (LogEvents) {
203 _compilation_log = new CompilationLog();
204 }
205 }
206
207 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
208 CompilerThread* thread = CompilerThread::current();
209 thread->set_task(task);
210 CompileLog* log = thread->log();
211 if (log != NULL) task->log_task_start(log);
212 }
213
214 CompileTaskWrapper::~CompileTaskWrapper() {
215 CompilerThread* thread = CompilerThread::current();
216 CompileTask* task = thread->task();
217 CompileLog* log = thread->log();
218 if (log != NULL) task->log_task_done(log);
219 thread->set_task(NULL);
220 task->set_code_handle(NULL);
221 thread->set_env(NULL);
222 if (task->is_blocking()) {
223 MutexLocker notifier(task->lock(), thread);
224 task->mark_complete();
225 // Notify the waiting thread that the compilation has completed.
226 task->lock()->notify_all();
227 } else {
228 task->mark_complete();
229
230 // By convention, the compiling thread is responsible for
231 // recycling a non-blocking CompileTask.
232 CompileTask::free(task);
233 }
234 }
235
236
237 CompileTask* CompileTask::_task_free_list = NULL;
238 #ifdef ASSERT
239 int CompileTask::_num_allocated_tasks = 0;
240 #endif
241 /**
242 * Allocate a CompileTask, from the free list if possible.
243 */
244 CompileTask* CompileTask::allocate() {
245 MutexLocker locker(CompileTaskAlloc_lock);
246 CompileTask* task = NULL;
247
248 if (_task_free_list != NULL) {
249 task = _task_free_list;
250 _task_free_list = task->next();
251 task->set_next(NULL);
252 } else {
253 task = new CompileTask();
254 DEBUG_ONLY(_num_allocated_tasks++;)
255 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
256 task->set_next(NULL);
257 task->set_is_free(true);
258 }
259 assert(task->is_free(), "Task must be free.");
260 task->set_is_free(false);
261 return task;
262 }
263
264
265 /**
266 * Add a task to the free list.
267 */
268 void CompileTask::free(CompileTask* task) {
269 MutexLocker locker(CompileTaskAlloc_lock);
270 if (!task->is_free()) {
271 task->set_code(NULL);
272 assert(!task->lock()->is_locked(), "Should not be locked when freed");
273 JNIHandles::destroy_global(task->_method_holder);
274 JNIHandles::destroy_global(task->_hot_method_holder);
275
276 task->set_is_free(true);
277 task->set_next(_task_free_list);
278 _task_free_list = task;
279 }
280 }
281
282 void CompileTask::initialize(int compile_id,
283 methodHandle method,
284 int osr_bci,
285 int comp_level,
286 methodHandle hot_method,
287 int hot_count,
288 const char* comment,
289 bool is_blocking) {
290 assert(!_lock->is_locked(), "bad locking");
291
292 _compile_id = compile_id;
293 _method = method();
294 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
295 _osr_bci = osr_bci;
296 _is_blocking = is_blocking;
297 _comp_level = comp_level;
298 _num_inlined_bytecodes = 0;
299
300 _is_complete = false;
301 _is_success = false;
302 _code_handle = NULL;
303
304 _hot_method = NULL;
305 _hot_method_holder = NULL;
306 _hot_count = hot_count;
307 _time_queued = 0; // tidy
308 _comment = comment;
309 _failure_reason = NULL;
310
311 if (LogCompilation) {
312 _time_queued = os::elapsed_counter();
313 if (hot_method.not_null()) {
314 if (hot_method == method) {
315 _hot_method = _method;
316 } else {
317 _hot_method = hot_method();
318 // only add loader or mirror if different from _method_holder
319 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
320 }
321 }
322 }
323
324 _next = NULL;
325 }
326
327 // ------------------------------------------------------------------
328 // CompileTask::code/set_code
329 nmethod* CompileTask::code() const {
330 if (_code_handle == NULL) return NULL;
331 return _code_handle->code();
332 }
333 void CompileTask::set_code(nmethod* nm) {
334 if (_code_handle == NULL && nm == NULL) return;
335 guarantee(_code_handle != NULL, "");
336 _code_handle->set_code(nm);
337 if (nm == NULL) _code_handle = NULL; // drop the handle also
338 }
339
340 void CompileTask::mark_on_stack() {
341 // Mark these methods as something redefine classes cannot remove.
342 _method->set_on_stack(true);
343 if (_hot_method != NULL) {
344 _hot_method->set_on_stack(true);
345 }
346 }
347
348 // ------------------------------------------------------------------
349 // CompileTask::print_line_on_error
350 //
351 // This function is called by fatal error handler when the thread
352 // causing troubles is a compiler thread.
353 //
354 // Do not grab any lock, do not allocate memory.
355 //
356 // Otherwise it's the same as CompileTask::print_line()
357 //
358 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
359 // print compiler name
360 st->print("%s:", CompileBroker::compiler_name(comp_level()));
361 print_compilation(st);
362 }
363
364 // ------------------------------------------------------------------
365 // CompileTask::print_line
366 void CompileTask::print_tty() {
367 ttyLocker ttyl; // keep the following output all in one block
368 // print compiler name if requested
369 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
370 print_compilation(tty);
371 }
372
373 // ------------------------------------------------------------------
374 // CompileTask::print_compilation_impl
375 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
376 bool is_osr_method, int osr_bci, bool is_blocking,
377 const char* msg, bool short_form, bool cr) {
378 if (!short_form) {
379 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
380 }
381 st->print("%4d ", compile_id); // print compilation number
382
383 // For unloaded methods the transition to zombie occurs after the
384 // method is cleared so it's impossible to report accurate
385 // information for that case.
386 bool is_synchronized = false;
387 bool has_exception_handler = false;
388 bool is_native = false;
389 if (method != NULL) {
390 is_synchronized = method->is_synchronized();
391 has_exception_handler = method->has_exception_handler();
392 is_native = method->is_native();
393 }
394 // method attributes
395 const char compile_type = is_osr_method ? '%' : ' ';
396 const char sync_char = is_synchronized ? 's' : ' ';
397 const char exception_char = has_exception_handler ? '!' : ' ';
398 const char blocking_char = is_blocking ? 'b' : ' ';
399 const char native_char = is_native ? 'n' : ' ';
400
401 // print method attributes
402 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
403
404 if (TieredCompilation) {
405 if (comp_level != -1) st->print("%d ", comp_level);
406 else st->print("- ");
407 }
408 st->print(" "); // more indent
409
410 if (method == NULL) {
411 st->print("(method)");
412 } else {
413 method->print_short_name(st);
414 if (is_osr_method) {
415 st->print(" @ %d", osr_bci);
416 }
417 if (method->is_native())
418 st->print(" (native)");
419 else
420 st->print(" (%d bytes)", method->code_size());
421 }
422
423 if (msg != NULL) {
424 st->print(" %s", msg);
425 }
426 if (cr) {
427 st->cr();
428 }
429 }
430
431 // ------------------------------------------------------------------
432 // CompileTask::print_inlining
433 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
434 // 1234567
435 st->print(" "); // print timestamp
436 // 1234
437 st->print(" "); // print compilation number
438
439 // method attributes
440 if (method->is_loaded()) {
441 const char sync_char = method->is_synchronized() ? 's' : ' ';
442 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
443 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
444
445 // print method attributes
446 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
447 } else {
448 // %s!bn
449 st->print(" "); // print method attributes
450 }
451
452 if (TieredCompilation) {
453 st->print(" ");
454 }
455 st->print(" "); // more indent
456 st->print(" "); // initial inlining indent
457
458 for (int i = 0; i < inline_level; i++) st->print(" ");
459
460 st->print("@ %d ", bci); // print bci
461 method->print_short_name(st);
462 if (method->is_loaded())
463 st->print(" (%d bytes)", method->code_size());
464 else
465 st->print(" (not loaded)");
466
467 if (msg != NULL) {
468 st->print(" %s", msg);
469 }
470 st->cr();
471 }
472
473 // ------------------------------------------------------------------
474 // CompileTask::print_inline_indent
475 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
476 // 1234567
477 st->print(" "); // print timestamp
478 // 1234
479 st->print(" "); // print compilation number
480 // %s!bn
481 st->print(" "); // print method attributes
482 if (TieredCompilation) {
483 st->print(" ");
484 }
485 st->print(" "); // more indent
486 st->print(" "); // initial inlining indent
487 for (int i = 0; i < inline_level; i++) st->print(" ");
488 }
489
490 // ------------------------------------------------------------------
491 // CompileTask::print_compilation
492 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
493 bool is_osr_method = osr_bci() != InvocationEntryBci;
494 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
495 }
496
497 // ------------------------------------------------------------------
498 // CompileTask::log_task
499 void CompileTask::log_task(xmlStream* log) {
500 Thread* thread = Thread::current();
501 methodHandle method(thread, this->method());
502 ResourceMark rm(thread);
503
504 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
505 log->print(" compile_id='%d'", _compile_id);
506 if (_osr_bci != CompileBroker::standard_entry_bci) {
507 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
508 } // else compile_kind='c2c'
509 if (!method.is_null()) log->method(method);
510 if (_osr_bci != CompileBroker::standard_entry_bci) {
511 log->print(" osr_bci='%d'", _osr_bci);
512 }
513 if (_comp_level != CompLevel_highest_tier) {
514 log->print(" level='%d'", _comp_level);
515 }
516 if (_is_blocking) {
517 log->print(" blocking='1'");
518 }
519 log->stamp();
520 }
521
522
523 // ------------------------------------------------------------------
524 // CompileTask::log_task_queued
525 void CompileTask::log_task_queued() {
526 Thread* thread = Thread::current();
527 ttyLocker ttyl;
528 ResourceMark rm(thread);
529
530 xtty->begin_elem("task_queued");
531 log_task(xtty);
532 if (_comment != NULL) {
533 xtty->print(" comment='%s'", _comment);
534 }
535 if (_hot_method != NULL) {
536 methodHandle hot(thread, _hot_method);
537 methodHandle method(thread, _method);
538 if (hot() != method()) {
539 xtty->method(hot);
540 }
541 }
542 if (_hot_count != 0) {
543 xtty->print(" hot_count='%d'", _hot_count);
544 }
545 xtty->end_elem();
546 }
547
548
549 // ------------------------------------------------------------------
550 // CompileTask::log_task_start
551 void CompileTask::log_task_start(CompileLog* log) {
552 log->begin_head("task");
553 log_task(log);
554 log->end_head();
555 }
556
557
558 // ------------------------------------------------------------------
559 // CompileTask::log_task_done
560 void CompileTask::log_task_done(CompileLog* log) {
561 Thread* thread = Thread::current();
562 methodHandle method(thread, this->method());
563 ResourceMark rm(thread);
564
565 if (!_is_success) {
566 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
567 log->elem("failure reason='%s'", reason);
568 }
569
570 // <task_done ... stamp='1.234'> </task>
571 nmethod* nm = code();
572 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
573 _is_success, nm == NULL ? 0 : nm->content_size(),
574 method->invocation_count());
575 int bec = method->backedge_count();
576 if (bec != 0) log->print(" backedge_count='%d'", bec);
577 // Note: "_is_complete" is about to be set, but is not.
578 if (_num_inlined_bytecodes != 0) {
579 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
580 }
581 log->stamp();
582 log->end_elem();
583 log->tail("task");
584 log->clear_identities(); // next task will have different CI
585 if (log->unflushed_count() > 2000) {
586 log->flush();
587 }
588 log->mark_file_end();
589 }
590
591
592
593 /**
594 * Add a CompileTask to a CompileQueue.
595 */
596 void CompileQueue::add(CompileTask* task) {
597 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
598
599 task->set_next(NULL);
600 task->set_prev(NULL);
601
602 if (_last == NULL) {
603 // The compile queue is empty.
604 assert(_first == NULL, "queue is empty");
605 _first = task;
606 _last = task;
607 } else {
608 // Append the task to the queue.
609 assert(_last->next() == NULL, "not last");
610 _last->set_next(task);
611 task->set_prev(_last);
612 _last = task;
613 }
614 ++_size;
615
616 // Mark the method as being in the compile queue.
617 task->method()->set_queued_for_compilation();
618
619 if (CIPrintCompileQueue) {
620 print_tty();
621 }
622
623 if (LogCompilation && xtty != NULL) {
624 task->log_task_queued();
625 }
626
627 // Notify CompilerThreads that a task is available.
628 MethodCompileQueue_lock->notify_all();
629 }
630
631 /**
632 * Empties compilation queue by putting all compilation tasks onto
633 * a freelist. Furthermore, the method wakes up all threads that are
634 * waiting on a compilation task to finish. This can happen if background
635 * compilation is disabled.
636 */
637 void CompileQueue::free_all() {
638 MutexLocker mu(MethodCompileQueue_lock);
639 CompileTask* next = _first;
640
641 // Iterate over all tasks in the compile queue
642 while (next != NULL) {
643 CompileTask* current = next;
644 next = current->next();
645 {
646 // Wake up thread that blocks on the compile task.
647 MutexLocker ct_lock(current->lock());
648 current->lock()->notify();
649 }
650 // Put the task back on the freelist.
651 CompileTask::free(current);
652 }
653 _first = NULL;
654
655 // Wake up all threads that block on the queue.
656 MethodCompileQueue_lock->notify_all();
657 }
658
659 /**
660 * Get the next CompileTask from a CompileQueue
661 */
662 CompileTask* CompileQueue::get() {
663 MutexLocker locker(MethodCompileQueue_lock);
664 // If _first is NULL we have no more compile jobs. There are two reasons for
665 // having no compile jobs: First, we compiled everything we wanted. Second,
666 // we ran out of code cache so compilation has been disabled. In the latter
667 // case we perform code cache sweeps to free memory such that we can re-enable
668 // compilation.
669 while (_first == NULL) {
670 // Exit loop if compilation is disabled forever
671 if (CompileBroker::is_compilation_disabled_forever()) {
672 return NULL;
673 }
674
675 // If there are no compilation tasks and we can compile new jobs
676 // (i.e., there is enough free space in the code cache) there is
677 // no need to invoke the sweeper. As a result, the hotness of methods
678 // remains unchanged. This behavior is desired, since we want to keep
679 // the stable state, i.e., we do not want to evict methods from the
680 // code cache if it is unnecessary.
681 // We need a timed wait here, since compiler threads can exit if compilation
682 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
683 // is not critical and we do not want idle compiler threads to wake up too often.
684 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
685 }
686
687 if (CompileBroker::is_compilation_disabled_forever()) {
688 return NULL;
689 }
690
691 CompileTask* task;
692 {
693 No_Safepoint_Verifier nsv;
694 task = CompilationPolicy::policy()->select_task(this);
695 }
696 remove(task);
697 purge_stale_tasks(); // may temporarily release MCQ lock
698 return task;
699 }
700
701 // Clean & deallocate stale compile tasks.
702 // Temporarily releases MethodCompileQueue lock.
703 void CompileQueue::purge_stale_tasks() {
704 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
705 if (_first_stale != NULL) {
706 // Stale tasks are purged when MCQ lock is released,
707 // but _first_stale updates are protected by MCQ lock.
708 // Once task processing starts and MCQ lock is released,
709 // other compiler threads can reuse _first_stale.
710 CompileTask* head = _first_stale;
711 _first_stale = NULL;
712 {
713 MutexUnlocker ul(MethodCompileQueue_lock);
714 for (CompileTask* task = head; task != NULL; ) {
715 CompileTask* next_task = task->next();
716 CompileTaskWrapper ctw(task); // Frees the task
717 task->set_failure_reason("stale task");
718 task = next_task;
719 }
720 }
721 }
722 }
723
724 void CompileQueue::remove(CompileTask* task) {
725 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
726 if (task->prev() != NULL) {
727 task->prev()->set_next(task->next());
728 } else {
729 // max is the first element
730 assert(task == _first, "Sanity");
731 _first = task->next();
732 }
733
734 if (task->next() != NULL) {
735 task->next()->set_prev(task->prev());
736 } else {
737 // max is the last element
738 assert(task == _last, "Sanity");
739 _last = task->prev();
740 }
741 --_size;
742 }
743
744 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
745 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
746 remove(task);
747
748 // Enqueue the task for reclamation (should be done outside MCQ lock)
749 task->set_next(_first_stale);
750 task->set_prev(NULL);
751 _first_stale = task;
752 }
753
754 // methods in the compile queue need to be marked as used on the stack
755 // so that they don't get reclaimed by Redefine Classes
756 void CompileQueue::mark_on_stack() {
757 CompileTask* task = _first;
758 while (task != NULL) {
759 task->mark_on_stack();
760 task = task->next();
761 }
762 }
763
764
765 CompileQueue* CompileBroker::compile_queue(int comp_level) {
766 if (is_c2_compile(comp_level)) return _c2_compile_queue;
767 if (is_c1_compile(comp_level)) return _c1_compile_queue;
768 return NULL;
769 }
770
771
772 void CompileBroker::print_compile_queues(outputStream* st) {
773 MutexLocker locker(MethodCompileQueue_lock);
774 if (_c1_compile_queue != NULL) {
775 _c1_compile_queue->print(st);
776 }
777 if (_c2_compile_queue != NULL) {
778 _c2_compile_queue->print(st);
779 }
780 }
781
782 void CompileQueue::print(outputStream* st) {
783 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
784 st->print_cr("Contents of %s", name());
785 st->print_cr("----------------------------");
786 CompileTask* task = _first;
787 if (task == NULL) {
788 st->print_cr("Empty");
789 } else {
790 while (task != NULL) {
791 task->print_compilation(st, NULL, true, true);
792 task = task->next();
793 }
794 }
795 st->print_cr("----------------------------");
796 }
797
798 void CompileQueue::print_tty() {
799 ttyLocker ttyl;
800 print(tty);
801 }
802
803 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
804
805 _current_method[0] = '\0';
806 _compile_type = CompileBroker::no_compile;
807
808 if (UsePerfData) {
809 ResourceMark rm;
810
811 // create the thread instance name space string - don't create an
812 // instance subspace if instance is -1 - keeps the adapterThread
813 // counters from having a ".0" namespace.
814 const char* thread_i = (instance == -1) ? thread_name :
815 PerfDataManager::name_space(thread_name, instance);
816
817
818 char* name = PerfDataManager::counter_name(thread_i, "method");
819 _perf_current_method =
820 PerfDataManager::create_string_variable(SUN_CI, name,
821 cmname_buffer_length,
822 _current_method, CHECK);
823
824 name = PerfDataManager::counter_name(thread_i, "type");
825 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
826 PerfData::U_None,
827 (jlong)_compile_type,
828 CHECK);
829
830 name = PerfDataManager::counter_name(thread_i, "time");
831 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
832 PerfData::U_Ticks, CHECK);
833
834 name = PerfDataManager::counter_name(thread_i, "compiles");
835 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
836 PerfData::U_Events, CHECK);
837 }
838 }
839
840 // ------------------------------------------------------------------
841 // CompileBroker::compilation_init
842 //
843 // Initialize the Compilation object
844 void CompileBroker::compilation_init() {
845 _last_method_compiled[0] = '\0';
846
847 // No need to initialize compilation system if we do not use it.
848 if (!UseCompiler) {
849 return;
850 }
851 #ifndef SHARK
852 // Set the interface to the current compiler(s).
853 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
854 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
855 #ifdef COMPILER1
856 if (c1_count > 0) {
857 _compilers[0] = new Compiler();
858 }
859 #endif // COMPILER1
860
861 #ifdef COMPILER2
862 if (c2_count > 0) {
863 _compilers[1] = new C2Compiler();
864 }
865 #endif // COMPILER2
866
867 #else // SHARK
868 int c1_count = 0;
869 int c2_count = 1;
870
871 _compilers[1] = new SharkCompiler();
872 #endif // SHARK
873
874 // Start the compiler thread(s) and the sweeper thread
875 init_compiler_sweeper_threads(c1_count, c2_count);
876 // totalTime performance counter is always created as it is required
877 // by the implementation of java.lang.management.CompilationMBean.
878 {
879 EXCEPTION_MARK;
880 _perf_total_compilation =
881 PerfDataManager::create_counter(JAVA_CI, "totalTime",
882 PerfData::U_Ticks, CHECK);
883 }
884
885
886 if (UsePerfData) {
887
888 EXCEPTION_MARK;
889
890 // create the jvmstat performance counters
891 _perf_osr_compilation =
892 PerfDataManager::create_counter(SUN_CI, "osrTime",
893 PerfData::U_Ticks, CHECK);
894
895 _perf_standard_compilation =
896 PerfDataManager::create_counter(SUN_CI, "standardTime",
897 PerfData::U_Ticks, CHECK);
898
899 _perf_total_bailout_count =
900 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
901 PerfData::U_Events, CHECK);
902
903 _perf_total_invalidated_count =
904 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
905 PerfData::U_Events, CHECK);
906
907 _perf_total_compile_count =
908 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
909 PerfData::U_Events, CHECK);
910 _perf_total_osr_compile_count =
911 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
912 PerfData::U_Events, CHECK);
913
914 _perf_total_standard_compile_count =
915 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
916 PerfData::U_Events, CHECK);
917
918 _perf_sum_osr_bytes_compiled =
919 PerfDataManager::create_counter(SUN_CI, "osrBytes",
920 PerfData::U_Bytes, CHECK);
921
922 _perf_sum_standard_bytes_compiled =
923 PerfDataManager::create_counter(SUN_CI, "standardBytes",
924 PerfData::U_Bytes, CHECK);
925
926 _perf_sum_nmethod_size =
927 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
928 PerfData::U_Bytes, CHECK);
929
930 _perf_sum_nmethod_code_size =
931 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
932 PerfData::U_Bytes, CHECK);
933
934 _perf_last_method =
935 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
936 CompilerCounters::cmname_buffer_length,
937 "", CHECK);
938
939 _perf_last_failed_method =
940 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
941 CompilerCounters::cmname_buffer_length,
942 "", CHECK);
943
944 _perf_last_invalidated_method =
945 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
946 CompilerCounters::cmname_buffer_length,
947 "", CHECK);
948
949 _perf_last_compile_type =
950 PerfDataManager::create_variable(SUN_CI, "lastType",
951 PerfData::U_None,
952 (jlong)CompileBroker::no_compile,
953 CHECK);
954
955 _perf_last_compile_size =
956 PerfDataManager::create_variable(SUN_CI, "lastSize",
957 PerfData::U_Bytes,
958 (jlong)CompileBroker::no_compile,
959 CHECK);
960
961
962 _perf_last_failed_type =
963 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
964 PerfData::U_None,
965 (jlong)CompileBroker::no_compile,
966 CHECK);
967
968 _perf_last_invalidated_type =
969 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
970 PerfData::U_None,
971 (jlong)CompileBroker::no_compile,
972 CHECK);
973 }
974
975 _initialized = true;
976 }
977
978
979 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
980 AbstractCompiler* comp, bool compiler_thread, TRAPS) {
981 JavaThread* thread = NULL;
982 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
983 instanceKlassHandle klass (THREAD, k);
984 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
985 Handle string = java_lang_String::create_from_str(name, CHECK_0);
986
987 // Initialize thread_oop to put it into the system threadGroup
988 Handle thread_group (THREAD, Universe::system_thread_group());
989 JavaValue result(T_VOID);
990 JavaCalls::call_special(&result, thread_oop,
991 klass,
992 vmSymbols::object_initializer_name(),
993 vmSymbols::threadgroup_string_void_signature(),
994 thread_group,
995 string,
996 CHECK_0);
997
998 {
999 MutexLocker mu(Threads_lock, THREAD);
1000 if (compiler_thread) {
1001 thread = new CompilerThread(queue, counters);
1002 } else {
1003 thread = new CodeCacheSweeperThread();
1004 }
1005 // At this point the new CompilerThread data-races with this startup
1006 // thread (which I believe is the primoridal thread and NOT the VM
1007 // thread). This means Java bytecodes being executed at startup can
1008 // queue compile jobs which will run at whatever default priority the
1009 // newly created CompilerThread runs at.
1010
1011
1012 // At this point it may be possible that no osthread was created for the
1013 // JavaThread due to lack of memory. We would have to throw an exception
1014 // in that case. However, since this must work and we do not allow
1015 // exceptions anyway, check and abort if this fails.
1016
1017 if (thread == NULL || thread->osthread() == NULL) {
1018 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1019 os::native_thread_creation_failed_msg());
1020 }
1021
1022 java_lang_Thread::set_thread(thread_oop(), thread);
1023
1024 // Note that this only sets the JavaThread _priority field, which by
1025 // definition is limited to Java priorities and not OS priorities.
1026 // The os-priority is set in the CompilerThread startup code itself
1027
1028 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1029
1030 // Note that we cannot call os::set_priority because it expects Java
1031 // priorities and we are *explicitly* using OS priorities so that it's
1032 // possible to set the compiler thread priority higher than any Java
1033 // thread.
1034
1035 int native_prio = CompilerThreadPriority;
1036 if (native_prio == -1) {
1037 if (UseCriticalCompilerThreadPriority) {
1038 native_prio = os::java_to_os_priority[CriticalPriority];
1039 } else {
1040 native_prio = os::java_to_os_priority[NearMaxPriority];
1041 }
1042 }
1043 os::set_native_priority(thread, native_prio);
1044
1045 java_lang_Thread::set_daemon(thread_oop());
1046
1047 thread->set_threadObj(thread_oop());
1048 if (compiler_thread) {
1049 thread->as_CompilerThread()->set_compiler(comp);
1050 }
1051 Threads::add(thread);
1052 Thread::start(thread);
1053 }
1054
1055 // Let go of Threads_lock before yielding
1056 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1057
1058 return thread;
1059 }
1060
1061
1062 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
1063 EXCEPTION_MARK;
1064 #if !defined(ZERO) && !defined(SHARK)
1065 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1066 #endif // !ZERO && !SHARK
1067 // Initialize the compilation queue
1068 if (c2_compiler_count > 0) {
1069 _c2_compile_queue = new CompileQueue("C2 compile queue", MethodCompileQueue_lock);
1070 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1071 }
1072 if (c1_compiler_count > 0) {
1073 _c1_compile_queue = new CompileQueue("C1 compile queue", MethodCompileQueue_lock);
1074 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1075 }
1076
1077 int compiler_count = c1_compiler_count + c2_compiler_count;
1078
1079 char name_buffer[256];
1080 const bool compiler_thread = true;
1081 for (int i = 0; i < c2_compiler_count; i++) {
1082 // Create a name for our thread.
1083 sprintf(name_buffer, "C2 CompilerThread%d", i);
1084 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1085 // Shark and C2
1086 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
1087 }
1088
1089 for (int i = c2_compiler_count; i < compiler_count; i++) {
1090 // Create a name for our thread.
1091 sprintf(name_buffer, "C1 CompilerThread%d", i);
1092 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1093 // C1
1094 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
1095 }
1096
1097 if (UsePerfData) {
1098 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1099 }
1100
1101 if (MethodFlushing) {
1102 // Initialize the sweeper thread
1103 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
1104 }
1105 }
1106
1107
1108 /**
1109 * Set the methods on the stack as on_stack so that redefine classes doesn't
1110 * reclaim them. This method is executed at a safepoint.
1111 */
1112 void CompileBroker::mark_on_stack() {
1113 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1114 // Since we are at a safepoint, we do not need a lock to access
1115 // the compile queues.
1116 if (_c2_compile_queue != NULL) {
1117 _c2_compile_queue->mark_on_stack();
1118 }
1119 if (_c1_compile_queue != NULL) {
1120 _c1_compile_queue->mark_on_stack();
1121 }
1122 }
1123
1124 // ------------------------------------------------------------------
1125 // CompileBroker::compile_method
1126 //
1127 // Request compilation of a method.
1128 void CompileBroker::compile_method_base(methodHandle method,
1129 int osr_bci,
1130 int comp_level,
1131 methodHandle hot_method,
1132 int hot_count,
1133 const char* comment,
1134 Thread* thread) {
1135 // do nothing if compiler thread(s) is not available
1136 if (!_initialized) {
1137 return;
1138 }
1139
1140 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1141 assert(method->method_holder()->oop_is_instance(),
1142 "sanity check");
1143 assert(!method->method_holder()->is_not_initialized(),
1144 "method holder must be initialized");
1145 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1146
1147 if (CIPrintRequests) {
1148 tty->print("request: ");
1149 method->print_short_name(tty);
1150 if (osr_bci != InvocationEntryBci) {
1151 tty->print(" osr_bci: %d", osr_bci);
1152 }
1153 tty->print(" comment: %s count: %d", comment, hot_count);
1154 if (!hot_method.is_null()) {
1155 tty->print(" hot: ");
1156 if (hot_method() != method()) {
1157 hot_method->print_short_name(tty);
1158 } else {
1159 tty->print("yes");
1160 }
1161 }
1162 tty->cr();
1163 }
1164
1165 // A request has been made for compilation. Before we do any
1166 // real work, check to see if the method has been compiled
1167 // in the meantime with a definitive result.
1168 if (compilation_is_complete(method, osr_bci, comp_level)) {
1169 return;
1170 }
1171
1172 #ifndef PRODUCT
1173 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1174 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1175 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1176 return;
1177 }
1178 }
1179 #endif
1180
1181 // If this method is already in the compile queue, then
1182 // we do not block the current thread.
1183 if (compilation_is_in_queue(method)) {
1184 // We may want to decay our counter a bit here to prevent
1185 // multiple denied requests for compilation. This is an
1186 // open compilation policy issue. Note: The other possibility,
1187 // in the case that this is a blocking compile request, is to have
1188 // all subsequent blocking requesters wait for completion of
1189 // ongoing compiles. Note that in this case we'll need a protocol
1190 // for freeing the associated compile tasks. [Or we could have
1191 // a single static monitor on which all these waiters sleep.]
1192 return;
1193 }
1194
1195 // If the requesting thread is holding the pending list lock
1196 // then we just return. We can't risk blocking while holding
1197 // the pending list lock or a 3-way deadlock may occur
1198 // between the reference handler thread, a GC (instigated
1199 // by a compiler thread), and compiled method registration.
1200 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1201 return;
1202 }
1203
1204 if (TieredCompilation) {
1205 // Tiered policy requires MethodCounters to exist before adding a method to
1206 // the queue. Create if we don't have them yet.
1207 method->get_method_counters(thread);
1208 }
1209
1210 // Outputs from the following MutexLocker block:
1211 CompileTask* task = NULL;
1212 bool blocking = false;
1213 CompileQueue* queue = compile_queue(comp_level);
1214
1215 // Acquire our lock.
1216 {
1217 MutexLocker locker(MethodCompileQueue_lock, thread);
1218
1219 // Make sure the method has not slipped into the queues since
1220 // last we checked; note that those checks were "fast bail-outs".
1221 // Here we need to be more careful, see 14012000 below.
1222 if (compilation_is_in_queue(method)) {
1223 return;
1224 }
1225
1226 // We need to check again to see if the compilation has
1227 // completed. A previous compilation may have registered
1228 // some result.
1229 if (compilation_is_complete(method, osr_bci, comp_level)) {
1230 return;
1231 }
1232
1233 // We now know that this compilation is not pending, complete,
1234 // or prohibited. Assign a compile_id to this compilation
1235 // and check to see if it is in our [Start..Stop) range.
1236 int compile_id = assign_compile_id(method, osr_bci);
1237 if (compile_id == 0) {
1238 // The compilation falls outside the allowed range.
1239 return;
1240 }
1241
1242 // Should this thread wait for completion of the compile?
1243 blocking = is_compile_blocking();
1244
1245 // We will enter the compilation in the queue.
1246 // 14012000: Note that this sets the queued_for_compile bits in
1247 // the target method. We can now reason that a method cannot be
1248 // queued for compilation more than once, as follows:
1249 // Before a thread queues a task for compilation, it first acquires
1250 // the compile queue lock, then checks if the method's queued bits
1251 // are set or it has already been compiled. Thus there can not be two
1252 // instances of a compilation task for the same method on the
1253 // compilation queue. Consider now the case where the compilation
1254 // thread has already removed a task for that method from the queue
1255 // and is in the midst of compiling it. In this case, the
1256 // queued_for_compile bits must be set in the method (and these
1257 // will be visible to the current thread, since the bits were set
1258 // under protection of the compile queue lock, which we hold now.
1259 // When the compilation completes, the compiler thread first sets
1260 // the compilation result and then clears the queued_for_compile
1261 // bits. Neither of these actions are protected by a barrier (or done
1262 // under the protection of a lock), so the only guarantee we have
1263 // (on machines with TSO (Total Store Order)) is that these values
1264 // will update in that order. As a result, the only combinations of
1265 // these bits that the current thread will see are, in temporal order:
1266 // <RESULT, QUEUE> :
1267 // <0, 1> : in compile queue, but not yet compiled
1268 // <1, 1> : compiled but queue bit not cleared
1269 // <1, 0> : compiled and queue bit cleared
1270 // Because we first check the queue bits then check the result bits,
1271 // we are assured that we cannot introduce a duplicate task.
1272 // Note that if we did the tests in the reverse order (i.e. check
1273 // result then check queued bit), we could get the result bit before
1274 // the compilation completed, and the queue bit after the compilation
1275 // completed, and end up introducing a "duplicate" (redundant) task.
1276 // In that case, the compiler thread should first check if a method
1277 // has already been compiled before trying to compile it.
1278 // NOTE: in the event that there are multiple compiler threads and
1279 // there is de-optimization/recompilation, things will get hairy,
1280 // and in that case it's best to protect both the testing (here) of
1281 // these bits, and their updating (here and elsewhere) under a
1282 // common lock.
1283 task = create_compile_task(queue,
1284 compile_id, method,
1285 osr_bci, comp_level,
1286 hot_method, hot_count, comment,
1287 blocking);
1288 }
1289
1290 if (blocking) {
1291 wait_for_completion(task);
1292 }
1293 }
1294
1295
1296 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1297 int comp_level,
1298 methodHandle hot_method, int hot_count,
1299 const char* comment, Thread* THREAD) {
1300 // make sure arguments make sense
1301 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1302 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1303 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1304 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1305 // allow any levels for WhiteBox
1306 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1307 // return quickly if possible
1308
1309 // lock, make sure that the compilation
1310 // isn't prohibited in a straightforward way.
1311 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1312 if (comp == NULL || !comp->can_compile_method(method) ||
1313 compilation_is_prohibited(method, osr_bci, comp_level)) {
1314 return NULL;
1315 }
1316
1317 if (osr_bci == InvocationEntryBci) {
1318 // standard compilation
1319 nmethod* method_code = method->code();
1320 if (method_code != NULL) {
1321 if (compilation_is_complete(method, osr_bci, comp_level)) {
1322 return method_code;
1323 }
1324 }
1325 if (method->is_not_compilable(comp_level)) {
1326 return NULL;
1327 }
1328 } else {
1329 // osr compilation
1330 #ifndef TIERED
1331 // seems like an assert of dubious value
1332 assert(comp_level == CompLevel_highest_tier,
1333 "all OSR compiles are assumed to be at a single compilation lavel");
1334 #endif // TIERED
1335 // We accept a higher level osr method
1336 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1337 if (nm != NULL) return nm;
1338 if (method->is_not_osr_compilable(comp_level)) return NULL;
1339 }
1340
1341 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1342 // some prerequisites that are compiler specific
1343 if (comp->is_c2() || comp->is_shark()) {
1344 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1345 // Resolve all classes seen in the signature of the method
1346 // we are compiling.
1347 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1348 }
1349
1350 // If the method is native, do the lookup in the thread requesting
1351 // the compilation. Native lookups can load code, which is not
1352 // permitted during compilation.
1353 //
1354 // Note: A native method implies non-osr compilation which is
1355 // checked with an assertion at the entry of this method.
1356 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1357 bool in_base_library;
1358 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1359 if (HAS_PENDING_EXCEPTION) {
1360 // In case of an exception looking up the method, we just forget
1361 // about it. The interpreter will kick-in and throw the exception.
1362 method->set_not_compilable(); // implies is_not_osr_compilable()
1363 CLEAR_PENDING_EXCEPTION;
1364 return NULL;
1365 }
1366 assert(method->has_native_function(), "must have native code by now");
1367 }
1368
1369 // RedefineClasses() has replaced this method; just return
1370 if (method->is_old()) {
1371 return NULL;
1372 }
1373
1374 // JVMTI -- post_compile_event requires jmethod_id() that may require
1375 // a lock the compiling thread can not acquire. Prefetch it here.
1376 if (JvmtiExport::should_post_compiled_method_load()) {
1377 method->jmethod_id();
1378 }
1379
1380 // do the compilation
1381 if (method->is_native()) {
1382 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1383 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1384 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1385 //
1386 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1387 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1388 AdapterHandlerLibrary::create_native_wrapper(method);
1389 } else {
1390 return NULL;
1391 }
1392 } else {
1393 // If the compiler is shut off due to code cache getting full
1394 // fail out now so blocking compiles dont hang the java thread
1395 if (!should_compile_new_jobs()) {
1396 CompilationPolicy::policy()->delay_compilation(method());
1397 return NULL;
1398 }
1399 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1400 }
1401
1402 // return requested nmethod
1403 // We accept a higher level osr method
1404 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1405 }
1406
1407
1408 // ------------------------------------------------------------------
1409 // CompileBroker::compilation_is_complete
1410 //
1411 // See if compilation of this method is already complete.
1412 bool CompileBroker::compilation_is_complete(methodHandle method,
1413 int osr_bci,
1414 int comp_level) {
1415 bool is_osr = (osr_bci != standard_entry_bci);
1416 if (is_osr) {
1417 if (method->is_not_osr_compilable(comp_level)) {
1418 return true;
1419 } else {
1420 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1421 return (result != NULL);
1422 }
1423 } else {
1424 if (method->is_not_compilable(comp_level)) {
1425 return true;
1426 } else {
1427 nmethod* result = method->code();
1428 if (result == NULL) return false;
1429 return comp_level == result->comp_level();
1430 }
1431 }
1432 }
1433
1434
1435 /**
1436 * See if this compilation is already requested.
1437 *
1438 * Implementation note: there is only a single "is in queue" bit
1439 * for each method. This means that the check below is overly
1440 * conservative in the sense that an osr compilation in the queue
1441 * will block a normal compilation from entering the queue (and vice
1442 * versa). This can be remedied by a full queue search to disambiguate
1443 * cases. If it is deemed profitable, this may be done.
1444 */
1445 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1446 return method->queued_for_compilation();
1447 }
1448
1449 // ------------------------------------------------------------------
1450 // CompileBroker::compilation_is_prohibited
1451 //
1452 // See if this compilation is not allowed.
1453 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1454 bool is_native = method->is_native();
1455 // Some compilers may not support the compilation of natives.
1456 AbstractCompiler *comp = compiler(comp_level);
1457 if (is_native &&
1458 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1459 method->set_not_compilable_quietly(comp_level);
1460 return true;
1461 }
1462
1463 bool is_osr = (osr_bci != standard_entry_bci);
1464 // Some compilers may not support on stack replacement.
1465 if (is_osr &&
1466 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1467 method->set_not_osr_compilable(comp_level);
1468 return true;
1469 }
1470
1471 // The method may be explicitly excluded by the user.
1472 bool quietly;
1473 if (CompilerOracle::should_exclude(method, quietly)) {
1474 if (!quietly) {
1475 // This does not happen quietly...
1476 ResourceMark rm;
1477 tty->print("### Excluding %s:%s",
1478 method->is_native() ? "generation of native wrapper" : "compile",
1479 (method->is_static() ? " static" : ""));
1480 method->print_short_name(tty);
1481 tty->cr();
1482 }
1483 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1484 }
1485
1486 return false;
1487 }
1488
1489 /**
1490 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1491 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1492 * The function also allows to generate separate compilation IDs for OSR compilations.
1493 */
1494 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1495 #ifdef ASSERT
1496 bool is_osr = (osr_bci != standard_entry_bci);
1497 int id;
1498 if (method->is_native()) {
1499 assert(!is_osr, "can't be osr");
1500 // Adapters, native wrappers and method handle intrinsics
1501 // should be generated always.
1502 return Atomic::add(1, &_compilation_id);
1503 } else if (CICountOSR && is_osr) {
1504 id = Atomic::add(1, &_osr_compilation_id);
1505 if (CIStartOSR <= id && id < CIStopOSR) {
1506 return id;
1507 }
1508 } else {
1509 id = Atomic::add(1, &_compilation_id);
1510 if (CIStart <= id && id < CIStop) {
1511 return id;
1512 }
1513 }
1514
1515 // Method was not in the appropriate compilation range.
1516 method->set_not_compilable_quietly();
1517 return 0;
1518 #else
1519 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1520 // only _compilation_id is incremented.
1521 return Atomic::add(1, &_compilation_id);
1522 #endif
1523 }
1524
1525 /**
1526 * Should the current thread block until this compilation request
1527 * has been fulfilled?
1528 */
1529 bool CompileBroker::is_compile_blocking() {
1530 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1531 return !BackgroundCompilation;
1532 }
1533
1534
1535 // ------------------------------------------------------------------
1536 // CompileBroker::preload_classes
1537 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1538 // Move this code over from c1_Compiler.cpp
1539 ShouldNotReachHere();
1540 }
1541
1542
1543 // ------------------------------------------------------------------
1544 // CompileBroker::create_compile_task
1545 //
1546 // Create a CompileTask object representing the current request for
1547 // compilation. Add this task to the queue.
1548 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1549 int compile_id,
1550 methodHandle method,
1551 int osr_bci,
1552 int comp_level,
1553 methodHandle hot_method,
1554 int hot_count,
1555 const char* comment,
1556 bool blocking) {
1557 CompileTask* new_task = CompileTask::allocate();
1558 new_task->initialize(compile_id, method, osr_bci, comp_level,
1559 hot_method, hot_count, comment,
1560 blocking);
1561 queue->add(new_task);
1562 return new_task;
1563 }
1564
1565
1566 /**
1567 * Wait for the compilation task to complete.
1568 */
1569 void CompileBroker::wait_for_completion(CompileTask* task) {
1570 if (CIPrintCompileQueue) {
1571 ttyLocker ttyl;
1572 tty->print_cr("BLOCKING FOR COMPILE");
1573 }
1574
1575 assert(task->is_blocking(), "can only wait on blocking task");
1576
1577 JavaThread* thread = JavaThread::current();
1578 thread->set_blocked_on_compilation(true);
1579
1580 methodHandle method(thread, task->method());
1581 {
1582 MutexLocker waiter(task->lock(), thread);
1583
1584 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1585 task->lock()->wait();
1586 }
1587 }
1588
1589 thread->set_blocked_on_compilation(false);
1590 if (is_compilation_disabled_forever()) {
1591 CompileTask::free(task);
1592 return;
1593 }
1594
1595 // It is harmless to check this status without the lock, because
1596 // completion is a stable property (until the task object is recycled).
1597 assert(task->is_complete(), "Compilation should have completed");
1598 assert(task->code_handle() == NULL, "must be reset");
1599
1600 // By convention, the waiter is responsible for recycling a
1601 // blocking CompileTask. Since there is only one waiter ever
1602 // waiting on a CompileTask, we know that no one else will
1603 // be using this CompileTask; we can free it.
1604 CompileTask::free(task);
1605 }
1606
1607 /**
1608 * Initialize compiler thread(s) + compiler object(s). The postcondition
1609 * of this function is that the compiler runtimes are initialized and that
1610 * compiler threads can start compiling.
1611 */
1612 bool CompileBroker::init_compiler_runtime() {
1613 CompilerThread* thread = CompilerThread::current();
1614 AbstractCompiler* comp = thread->compiler();
1615 // Final sanity check - the compiler object must exist
1616 guarantee(comp != NULL, "Compiler object must exist");
1617
1618 int system_dictionary_modification_counter;
1619 {
1620 MutexLocker locker(Compile_lock, thread);
1621 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1622 }
1623
1624 {
1625 // Must switch to native to allocate ci_env
1626 ThreadToNativeFromVM ttn(thread);
1627 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1628 // Cache Jvmti state
1629 ci_env.cache_jvmti_state();
1630 // Cache DTrace flags
1631 ci_env.cache_dtrace_flags();
1632
1633 // Switch back to VM state to do compiler initialization
1634 ThreadInVMfromNative tv(thread);
1635 ResetNoHandleMark rnhm;
1636
1637
1638 if (!comp->is_shark()) {
1639 // Perform per-thread and global initializations
1640 comp->initialize();
1641 }
1642 }
1643
1644 if (comp->is_failed()) {
1645 disable_compilation_forever();
1646 // If compiler initialization failed, no compiler thread that is specific to a
1647 // particular compiler runtime will ever start to compile methods.
1648 shutdown_compiler_runtime(comp, thread);
1649 return false;
1650 }
1651
1652 // C1 specific check
1653 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1654 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1655 return false;
1656 }
1657
1658 return true;
1659 }
1660
1661 /**
1662 * If C1 and/or C2 initialization failed, we shut down all compilation.
1663 * We do this to keep things simple. This can be changed if it ever turns
1664 * out to be a problem.
1665 */
1666 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1667 // Free buffer blob, if allocated
1668 if (thread->get_buffer_blob() != NULL) {
1669 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1670 CodeCache::free(thread->get_buffer_blob());
1671 }
1672
1673 if (comp->should_perform_shutdown()) {
1674 // There are two reasons for shutting down the compiler
1675 // 1) compiler runtime initialization failed
1676 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1677 warning("%s initialization failed. Shutting down all compilers", comp->name());
1678
1679 // Only one thread per compiler runtime object enters here
1680 // Set state to shut down
1681 comp->set_shut_down();
1682
1683 // Delete all queued compilation tasks to make compiler threads exit faster.
1684 if (_c1_compile_queue != NULL) {
1685 _c1_compile_queue->free_all();
1686 }
1687
1688 if (_c2_compile_queue != NULL) {
1689 _c2_compile_queue->free_all();
1690 }
1691
1692 // Set flags so that we continue execution with using interpreter only.
1693 UseCompiler = false;
1694 UseInterpreter = true;
1695
1696 // We could delete compiler runtimes also. However, there are references to
1697 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1698 // fail. This can be done later if necessary.
1699 }
1700 }
1701
1702 // ------------------------------------------------------------------
1703 // CompileBroker::compiler_thread_loop
1704 //
1705 // The main loop run by a CompilerThread.
1706 void CompileBroker::compiler_thread_loop() {
1707 CompilerThread* thread = CompilerThread::current();
1708 CompileQueue* queue = thread->queue();
1709 // For the thread that initializes the ciObjectFactory
1710 // this resource mark holds all the shared objects
1711 ResourceMark rm;
1712
1713 // First thread to get here will initialize the compiler interface
1714
1715 if (!ciObjectFactory::is_initialized()) {
1716 ASSERT_IN_VM;
1717 MutexLocker only_one (CompileThread_lock, thread);
1718 if (!ciObjectFactory::is_initialized()) {
1719 ciObjectFactory::initialize();
1720 }
1721 }
1722
1723 // Open a log.
1724 if (LogCompilation) {
1725 init_compiler_thread_log();
1726 }
1727 CompileLog* log = thread->log();
1728 if (log != NULL) {
1729 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1730 thread->name(),
1731 os::current_thread_id(),
1732 os::current_process_id());
1733 log->stamp();
1734 log->end_elem();
1735 }
1736
1737 // If compiler thread/runtime initialization fails, exit the compiler thread
1738 if (!init_compiler_runtime()) {
1739 return;
1740 }
1741
1742 // Poll for new compilation tasks as long as the JVM runs. Compilation
1743 // should only be disabled if something went wrong while initializing the
1744 // compiler runtimes. This, in turn, should not happen. The only known case
1745 // when compiler runtime initialization fails is if there is not enough free
1746 // space in the code cache to generate the necessary stubs, etc.
1747 while (!is_compilation_disabled_forever()) {
1748 // We need this HandleMark to avoid leaking VM handles.
1749 HandleMark hm(thread);
1750
1751 CompileTask* task = queue->get();
1752 if (task == NULL) {
1753 continue;
1754 }
1755
1756 // Give compiler threads an extra quanta. They tend to be bursty and
1757 // this helps the compiler to finish up the job.
1758 if (CompilerThreadHintNoPreempt) {
1759 os::hint_no_preempt();
1760 }
1761
1762 // trace per thread time and compile statistics
1763 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1764 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1765
1766 // Assign the task to the current thread. Mark this compilation
1767 // thread as active for the profiler.
1768 CompileTaskWrapper ctw(task);
1769 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1770 task->set_code_handle(&result_handle);
1771 methodHandle method(thread, task->method());
1772
1773 // Never compile a method if breakpoints are present in it
1774 if (method()->number_of_breakpoints() == 0) {
1775 // Compile the method.
1776 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1777 invoke_compiler_on_method(task);
1778 } else {
1779 // After compilation is disabled, remove remaining methods from queue
1780 method->clear_queued_for_compilation();
1781 task->set_failure_reason("compilation is disabled");
1782 }
1783 }
1784 }
1785
1786 // Shut down compiler runtime
1787 shutdown_compiler_runtime(thread->compiler(), thread);
1788 }
1789
1790 // ------------------------------------------------------------------
1791 // CompileBroker::init_compiler_thread_log
1792 //
1793 // Set up state required by +LogCompilation.
1794 void CompileBroker::init_compiler_thread_log() {
1795 CompilerThread* thread = CompilerThread::current();
1796 char file_name[4*K];
1797 FILE* fp = NULL;
1798 intx thread_id = os::current_thread_id();
1799 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1800 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1801 if (dir == NULL) {
1802 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1803 thread_id, os::current_process_id());
1804 } else {
1805 jio_snprintf(file_name, sizeof(file_name),
1806 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1807 os::file_separator(), thread_id, os::current_process_id());
1808 }
1809
1810 fp = fopen(file_name, "at");
1811 if (fp != NULL) {
1812 if (LogCompilation && Verbose) {
1813 tty->print_cr("Opening compilation log %s", file_name);
1814 }
1815 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1816 thread->init_log(log);
1817
1818 if (xtty != NULL) {
1819 ttyLocker ttyl;
1820 // Record any per thread log files
1821 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1822 }
1823 return;
1824 }
1825 }
1826 warning("Cannot open log file: %s", file_name);
1827 }
1828
1829 void CompileBroker::log_metaspace_failure() {
1830 const char* message = "some methods may not be compiled because metaspace "
1831 "is out of memory";
1832 if (_compilation_log != NULL) {
1833 _compilation_log->log_metaspace_failure(message);
1834 }
1835 if (PrintCompilation) {
1836 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1837 }
1838 }
1839
1840
1841 // ------------------------------------------------------------------
1842 // CompileBroker::set_should_block
1843 //
1844 // Set _should_block.
1845 // Call this from the VM, with Threads_lock held and a safepoint requested.
1846 void CompileBroker::set_should_block() {
1847 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1848 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1849 #ifndef PRODUCT
1850 if (PrintCompilation && (Verbose || WizardMode))
1851 tty->print_cr("notifying compiler thread pool to block");
1852 #endif
1853 _should_block = true;
1854 }
1855
1856 // ------------------------------------------------------------------
1857 // CompileBroker::maybe_block
1858 //
1859 // Call this from the compiler at convenient points, to poll for _should_block.
1860 void CompileBroker::maybe_block() {
1861 if (_should_block) {
1862 #ifndef PRODUCT
1863 if (PrintCompilation && (Verbose || WizardMode))
1864 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1865 #endif
1866 ThreadInVMfromNative tivfn(JavaThread::current());
1867 }
1868 }
1869
1870 // wrapper for CodeCache::print_summary()
1871 static void codecache_print(bool detailed)
1872 {
1873 ResourceMark rm;
1874 stringStream s;
1875 // Dump code cache into a buffer before locking the tty,
1876 {
1877 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1878 CodeCache::print_summary(&s, detailed);
1879 }
1880 ttyLocker ttyl;
1881 tty->print("%s", s.as_string());
1882 }
1883
1884 // ------------------------------------------------------------------
1885 // CompileBroker::invoke_compiler_on_method
1886 //
1887 // Compile a method.
1888 //
1889 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1890 if (PrintCompilation) {
1891 ResourceMark rm;
1892 task->print_tty();
1893 }
1894 elapsedTimer time;
1895
1896 CompilerThread* thread = CompilerThread::current();
1897 ResourceMark rm(thread);
1898
1899 if (LogEvents) {
1900 _compilation_log->log_compile(thread, task);
1901 }
1902
1903 // Common flags.
1904 uint compile_id = task->compile_id();
1905 int osr_bci = task->osr_bci();
1906 bool is_osr = (osr_bci != standard_entry_bci);
1907 bool should_log = (thread->log() != NULL);
1908 bool should_break = false;
1909 int task_level = task->comp_level();
1910 {
1911 // create the handle inside it's own block so it can't
1912 // accidentally be referenced once the thread transitions to
1913 // native. The NoHandleMark before the transition should catch
1914 // any cases where this occurs in the future.
1915 methodHandle method(thread, task->method());
1916 should_break = check_break_at(method, compile_id, is_osr);
1917 if (should_log && !CompilerOracle::should_log(method)) {
1918 should_log = false;
1919 }
1920 assert(!method->is_native(), "no longer compile natives");
1921
1922 // Save information about this method in case of failure.
1923 set_last_compile(thread, method, is_osr, task_level);
1924
1925 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1926 }
1927
1928 // Allocate a new set of JNI handles.
1929 push_jni_handle_block();
1930 Method* target_handle = task->method();
1931 int compilable = ciEnv::MethodCompilable;
1932 {
1933 int system_dictionary_modification_counter;
1934 {
1935 MutexLocker locker(Compile_lock, thread);
1936 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1937 }
1938
1939 NoHandleMark nhm;
1940 ThreadToNativeFromVM ttn(thread);
1941
1942 ciEnv ci_env(task, system_dictionary_modification_counter);
1943 if (should_break) {
1944 ci_env.set_break_at_compile(true);
1945 }
1946 if (should_log) {
1947 ci_env.set_log(thread->log());
1948 }
1949 assert(thread->env() == &ci_env, "set by ci_env");
1950 // The thread-env() field is cleared in ~CompileTaskWrapper.
1951
1952 // Cache Jvmti state
1953 ci_env.cache_jvmti_state();
1954
1955 // Cache DTrace flags
1956 ci_env.cache_dtrace_flags();
1957
1958 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1959
1960 TraceTime t1("compilation", &time);
1961 EventCompilation event;
1962
1963 AbstractCompiler *comp = compiler(task_level);
1964 if (comp == NULL) {
1965 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1966 } else {
1967 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1968 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1969 while (WhiteBox::compilation_locked) {
1970 locker.wait(Mutex::_no_safepoint_check_flag);
1971 }
1972 }
1973 comp->compile_method(&ci_env, target, osr_bci);
1974 }
1975
1976 if (!ci_env.failing() && task->code() == NULL) {
1977 //assert(false, "compiler should always document failure");
1978 // The compiler elected, without comment, not to register a result.
1979 // Do not attempt further compilations of this method.
1980 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1981 }
1982
1983 // Copy this bit to the enclosing block:
1984 compilable = ci_env.compilable();
1985
1986 if (ci_env.failing()) {
1987 task->set_failure_reason(ci_env.failure_reason());
1988 const char* retry_message = ci_env.retry_message();
1989 if (_compilation_log != NULL) {
1990 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1991 }
1992 if (PrintCompilation) {
1993 FormatBufferResource msg = retry_message != NULL ?
1994 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1995 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
1996 task->print_compilation(tty, msg);
1997 }
1998 } else {
1999 task->mark_success();
2000 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2001 if (_compilation_log != NULL) {
2002 nmethod* code = task->code();
2003 if (code != NULL) {
2004 _compilation_log->log_nmethod(thread, code);
2005 }
2006 }
2007 }
2008 // simulate crash during compilation
2009 assert(task->compile_id() != CICrashAt, "just as planned");
2010 if (event.should_commit()) {
2011 event.set_method(target->get_Method());
2012 event.set_compileID(compile_id);
2013 event.set_compileLevel(task->comp_level());
2014 event.set_succeded(task->is_success());
2015 event.set_isOsr(is_osr);
2016 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2017 event.set_inlinedBytes(task->num_inlined_bytecodes());
2018 event.commit();
2019 }
2020 }
2021 pop_jni_handle_block();
2022
2023 methodHandle method(thread, task->method());
2024
2025 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2026
2027 collect_statistics(thread, time, task);
2028
2029 if (PrintCompilation && PrintCompilation2) {
2030 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2031 tty->print("%4d ", compile_id); // print compilation number
2032 tty->print("%s ", (is_osr ? "%" : " "));
2033 if (task->code() != NULL) {
2034 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2035 }
2036 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2037 }
2038
2039 if (PrintCodeCacheOnCompilation)
2040 codecache_print(/* detailed= */ false);
2041
2042 // Disable compilation, if required.
2043 switch (compilable) {
2044 case ciEnv::MethodCompilable_never:
2045 if (is_osr)
2046 method->set_not_osr_compilable_quietly();
2047 else
2048 method->set_not_compilable_quietly();
2049 break;
2050 case ciEnv::MethodCompilable_not_at_tier:
2051 if (is_osr)
2052 method->set_not_osr_compilable_quietly(task_level);
2053 else
2054 method->set_not_compilable_quietly(task_level);
2055 break;
2056 }
2057
2058 // Note that the queued_for_compilation bits are cleared without
2059 // protection of a mutex. [They were set by the requester thread,
2060 // when adding the task to the compile queue -- at which time the
2061 // compile queue lock was held. Subsequently, we acquired the compile
2062 // queue lock to get this task off the compile queue; thus (to belabour
2063 // the point somewhat) our clearing of the bits must be occurring
2064 // only after the setting of the bits. See also 14012000 above.
2065 method->clear_queued_for_compilation();
2066
2067 #ifdef ASSERT
2068 if (CollectedHeap::fired_fake_oom()) {
2069 // The current compile received a fake OOM during compilation so
2070 // go ahead and exit the VM since the test apparently succeeded
2071 tty->print_cr("*** Shutting down VM after successful fake OOM");
2072 vm_exit(0);
2073 }
2074 #endif
2075 }
2076
2077 /**
2078 * The CodeCache is full. Print warning and disable compilation.
2079 * Schedule code cache cleaning so compilation can continue later.
2080 * This function needs to be called only from CodeCache::allocate(),
2081 * since we currently handle a full code cache uniformly.
2082 */
2083 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2084 UseInterpreter = true;
2085 if (UseCompiler || AlwaysCompileLoopMethods ) {
2086 if (xtty != NULL) {
2087 ResourceMark rm;
2088 stringStream s;
2089 // Dump code cache state into a buffer before locking the tty,
2090 // because log_state() will use locks causing lock conflicts.
2091 CodeCache::log_state(&s);
2092 // Lock to prevent tearing
2093 ttyLocker ttyl;
2094 xtty->begin_elem("code_cache_full");
2095 xtty->print("%s", s.as_string());
2096 xtty->stamp();
2097 xtty->end_elem();
2098 }
2099
2100 #ifndef PRODUCT
2101 if (CompileTheWorld || ExitOnFullCodeCache) {
2102 codecache_print(/* detailed= */ true);
2103 before_exit(JavaThread::current());
2104 exit_globals(); // will delete tty
2105 vm_direct_exit(CompileTheWorld ? 0 : 1);
2106 }
2107 #endif
2108 if (UseCodeCacheFlushing) {
2109 // Since code cache is full, immediately stop new compiles
2110 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2111 NMethodSweeper::log_sweep("disable_compiler");
2112 }
2113 } else {
2114 disable_compilation_forever();
2115 }
2116
2117 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2118 }
2119 }
2120
2121 // ------------------------------------------------------------------
2122 // CompileBroker::set_last_compile
2123 //
2124 // Record this compilation for debugging purposes.
2125 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2126 ResourceMark rm;
2127 char* method_name = method->name()->as_C_string();
2128 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2129 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2130 char current_method[CompilerCounters::cmname_buffer_length];
2131 size_t maxLen = CompilerCounters::cmname_buffer_length;
2132
2133 if (UsePerfData) {
2134 const char* class_name = method->method_holder()->name()->as_C_string();
2135
2136 size_t s1len = strlen(class_name);
2137 size_t s2len = strlen(method_name);
2138
2139 // check if we need to truncate the string
2140 if (s1len + s2len + 2 > maxLen) {
2141
2142 // the strategy is to lop off the leading characters of the
2143 // class name and the trailing characters of the method name.
2144
2145 if (s2len + 2 > maxLen) {
2146 // lop of the entire class name string, let snprintf handle
2147 // truncation of the method name.
2148 class_name += s1len; // null string
2149 }
2150 else {
2151 // lop off the extra characters from the front of the class name
2152 class_name += ((s1len + s2len + 2) - maxLen);
2153 }
2154 }
2155
2156 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2157 }
2158
2159 if (CICountOSR && is_osr) {
2160 _last_compile_type = osr_compile;
2161 } else {
2162 _last_compile_type = normal_compile;
2163 }
2164 _last_compile_level = comp_level;
2165
2166 if (UsePerfData) {
2167 CompilerCounters* counters = thread->counters();
2168 counters->set_current_method(current_method);
2169 counters->set_compile_type((jlong)_last_compile_type);
2170 }
2171 }
2172
2173
2174 // ------------------------------------------------------------------
2175 // CompileBroker::push_jni_handle_block
2176 //
2177 // Push on a new block of JNI handles.
2178 void CompileBroker::push_jni_handle_block() {
2179 JavaThread* thread = JavaThread::current();
2180
2181 // Allocate a new block for JNI handles.
2182 // Inlined code from jni_PushLocalFrame()
2183 JNIHandleBlock* java_handles = thread->active_handles();
2184 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2185 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2186 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2187 thread->set_active_handles(compile_handles);
2188 }
2189
2190
2191 // ------------------------------------------------------------------
2192 // CompileBroker::pop_jni_handle_block
2193 //
2194 // Pop off the current block of JNI handles.
2195 void CompileBroker::pop_jni_handle_block() {
2196 JavaThread* thread = JavaThread::current();
2197
2198 // Release our JNI handle block
2199 JNIHandleBlock* compile_handles = thread->active_handles();
2200 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2201 thread->set_active_handles(java_handles);
2202 compile_handles->set_pop_frame_link(NULL);
2203 JNIHandleBlock::release_block(compile_handles, thread); // may block
2204 }
2205
2206
2207 // ------------------------------------------------------------------
2208 // CompileBroker::check_break_at
2209 //
2210 // Should the compilation break at the current compilation.
2211 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2212 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2213 return true;
2214 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2215 return true;
2216 } else {
2217 return (compile_id == CIBreakAt);
2218 }
2219 }
2220
2221 // ------------------------------------------------------------------
2222 // CompileBroker::collect_statistics
2223 //
2224 // Collect statistics about the compilation.
2225
2226 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2227 bool success = task->is_success();
2228 methodHandle method (thread, task->method());
2229 uint compile_id = task->compile_id();
2230 bool is_osr = (task->osr_bci() != standard_entry_bci);
2231 nmethod* code = task->code();
2232 CompilerCounters* counters = thread->counters();
2233
2234 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2235 MutexLocker locker(CompileStatistics_lock);
2236
2237 // _perf variables are production performance counters which are
2238 // updated regardless of the setting of the CITime and CITimeEach flags
2239 //
2240
2241 // account all time, including bailouts and failures in this counter;
2242 // C1 and C2 counters are counting both successful and unsuccessful compiles
2243 _t_total_compilation.add(time);
2244
2245 if (!success) {
2246 _total_bailout_count++;
2247 if (UsePerfData) {
2248 _perf_last_failed_method->set_value(counters->current_method());
2249 _perf_last_failed_type->set_value(counters->compile_type());
2250 _perf_total_bailout_count->inc();
2251 }
2252 _t_bailedout_compilation.add(time);
2253 } else if (code == NULL) {
2254 if (UsePerfData) {
2255 _perf_last_invalidated_method->set_value(counters->current_method());
2256 _perf_last_invalidated_type->set_value(counters->compile_type());
2257 _perf_total_invalidated_count->inc();
2258 }
2259 _total_invalidated_count++;
2260 _t_invalidated_compilation.add(time);
2261 } else {
2262 // Compilation succeeded
2263
2264 // update compilation ticks - used by the implementation of
2265 // java.lang.management.CompilationMBean
2266 _perf_total_compilation->inc(time.ticks());
2267 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2268
2269 if (CITime) {
2270 if (is_osr) {
2271 _t_osr_compilation.add(time);
2272 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2273 } else {
2274 _t_standard_compilation.add(time);
2275 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2276 }
2277 }
2278
2279 if (UsePerfData) {
2280 // save the name of the last method compiled
2281 _perf_last_method->set_value(counters->current_method());
2282 _perf_last_compile_type->set_value(counters->compile_type());
2283 _perf_last_compile_size->set_value(method->code_size() +
2284 task->num_inlined_bytecodes());
2285 if (is_osr) {
2286 _perf_osr_compilation->inc(time.ticks());
2287 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2288 } else {
2289 _perf_standard_compilation->inc(time.ticks());
2290 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2291 }
2292 }
2293
2294 if (CITimeEach) {
2295 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2296 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2297 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2298 }
2299
2300 // Collect counts of successful compilations
2301 _sum_nmethod_size += code->total_size();
2302 _sum_nmethod_code_size += code->insts_size();
2303 _total_compile_count++;
2304
2305 if (UsePerfData) {
2306 _perf_sum_nmethod_size->inc( code->total_size());
2307 _perf_sum_nmethod_code_size->inc(code->insts_size());
2308 _perf_total_compile_count->inc();
2309 }
2310
2311 if (is_osr) {
2312 if (UsePerfData) _perf_total_osr_compile_count->inc();
2313 _total_osr_compile_count++;
2314 } else {
2315 if (UsePerfData) _perf_total_standard_compile_count->inc();
2316 _total_standard_compile_count++;
2317 }
2318 }
2319 // set the current method for the thread to null
2320 if (UsePerfData) counters->set_current_method("");
2321 }
2322
2323 const char* CompileBroker::compiler_name(int comp_level) {
2324 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2325 if (comp == NULL) {
2326 return "no compiler";
2327 } else {
2328 return (comp->name());
2329 }
2330 }
2331
2332 void CompileBroker::print_times() {
2333 tty->cr();
2334 tty->print_cr("Accumulated compiler times");
2335 tty->print_cr("----------------------------------------------------------");
2336 //0000000000111111111122222222223333333333444444444455555555556666666666
2337 //0123456789012345678901234567890123456789012345678901234567890123456789
2338 tty->print_cr(" Total compilation time : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2339 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2340 CompileBroker::_t_standard_compilation.seconds(),
2341 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2342 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2343 CompileBroker::_t_bailedout_compilation.seconds(),
2344 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2345 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2346 CompileBroker::_t_osr_compilation.seconds(),
2347 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2348 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2349 CompileBroker::_t_invalidated_compilation.seconds(),
2350 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2351
2352 AbstractCompiler *comp = compiler(CompLevel_simple);
2353 if (comp != NULL) {
2354 tty->cr();
2355 comp->print_timers();
2356 }
2357 comp = compiler(CompLevel_full_optimization);
2358 if (comp != NULL) {
2359 tty->cr();
2360 comp->print_timers();
2361 }
2362 tty->cr();
2363 tty->print_cr(" Total compiled methods : %8d methods", CompileBroker::_total_compile_count);
2364 tty->print_cr(" Standard compilation : %8d methods", CompileBroker::_total_standard_compile_count);
2365 tty->print_cr(" On stack replacement : %8d methods", CompileBroker::_total_osr_compile_count);
2366 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2367 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2368 tty->print_cr(" Standard compilation : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2369 tty->print_cr(" On stack replacement : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2370 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2371 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2372 tty->cr();
2373 tty->print_cr(" nmethod code size : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2374 tty->print_cr(" nmethod total size : %8d bytes", CompileBroker::_sum_nmethod_size);
2375 }
2376
2377 // Debugging output for failure
2378 void CompileBroker::print_last_compile() {
2379 if ( _last_compile_level != CompLevel_none &&
2380 compiler(_last_compile_level) != NULL &&
2381 _last_method_compiled != NULL &&
2382 _last_compile_type != no_compile) {
2383 if (_last_compile_type == osr_compile) {
2384 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2385 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2386 } else {
2387 tty->print_cr("Last parse: %d+++(%d) %s",
2388 _compilation_id, _last_compile_level, _last_method_compiled);
2389 }
2390 }
2391 }
2392
2393
2394 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2395 #ifndef PRODUCT
2396 st->print_cr("Compiler thread printing unimplemented.");
2397 st->cr();
2398 #endif
2399 }