1 /*
2 * Copyright (c) 1999, 2019, 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 #if INCLUDE_JFR
34 #include "jfr/jfrEvents.hpp"
35 #endif
36 #include "memory/allocation.inline.hpp"
37 #include "oops/methodData.hpp"
38 #include "oops/method.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/nativeLookup.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/compilationPolicy.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.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 #ifndef USDT2
66 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
67 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
68 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
69 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
70
71 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
72 { \
73 Symbol* klass_name = (method)->klass_name(); \
74 Symbol* name = (method)->name(); \
75 Symbol* signature = (method)->signature(); \
76 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
77 comp_name, strlen(comp_name), \
78 klass_name->bytes(), klass_name->utf8_length(), \
79 name->bytes(), name->utf8_length(), \
80 signature->bytes(), signature->utf8_length()); \
81 }
82
83 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
84 { \
85 Symbol* klass_name = (method)->klass_name(); \
86 Symbol* name = (method)->name(); \
87 Symbol* signature = (method)->signature(); \
88 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
89 comp_name, strlen(comp_name), \
90 klass_name->bytes(), klass_name->utf8_length(), \
91 name->bytes(), name->utf8_length(), \
92 signature->bytes(), signature->utf8_length(), (success)); \
93 }
94
95 #else /* USDT2 */
96
97 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
98 { \
99 Symbol* klass_name = (method)->klass_name(); \
100 Symbol* name = (method)->name(); \
101 Symbol* signature = (method)->signature(); \
102 HOTSPOT_METHOD_COMPILE_BEGIN( \
103 comp_name, strlen(comp_name), \
104 (char *) klass_name->bytes(), klass_name->utf8_length(), \
105 (char *) name->bytes(), name->utf8_length(), \
106 (char *) signature->bytes(), signature->utf8_length()); \
107 }
108
109 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
110 { \
111 Symbol* klass_name = (method)->klass_name(); \
112 Symbol* name = (method)->name(); \
113 Symbol* signature = (method)->signature(); \
114 HOTSPOT_METHOD_COMPILE_END( \
115 comp_name, strlen(comp_name), \
116 (char *) klass_name->bytes(), klass_name->utf8_length(), \
117 (char *) name->bytes(), name->utf8_length(), \
118 (char *) signature->bytes(), signature->utf8_length(), (success)); \
119 }
120 #endif /* USDT2 */
121
122 #else // ndef DTRACE_ENABLED
123
124 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
125 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
126
127 #endif // ndef DTRACE_ENABLED
128
129 bool CompileBroker::_initialized = false;
130 volatile bool CompileBroker::_should_block = false;
131 volatile jint CompileBroker::_print_compilation_warning = 0;
132 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
133
134 // The installed compiler(s)
135 AbstractCompiler* CompileBroker::_compilers[2];
136
137 // These counters are used to assign an unique ID to each compilation.
138 volatile jint CompileBroker::_compilation_id = 0;
139 volatile jint CompileBroker::_osr_compilation_id = 0;
140
141 // Debugging information
142 int CompileBroker::_last_compile_type = no_compile;
143 int CompileBroker::_last_compile_level = CompLevel_none;
144 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
145
146 // Performance counters
147 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
148 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
149 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
150
151 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
154 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
155 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
156
157 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
158 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
160 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
161
162 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
163 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
164 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
165 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
166 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
167 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
168 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
169
170 // Timers and counters for generating statistics
171 elapsedTimer CompileBroker::_t_total_compilation;
172 elapsedTimer CompileBroker::_t_osr_compilation;
173 elapsedTimer CompileBroker::_t_standard_compilation;
174
175 int CompileBroker::_total_bailout_count = 0;
176 int CompileBroker::_total_invalidated_count = 0;
177 int CompileBroker::_total_compile_count = 0;
178 int CompileBroker::_total_osr_compile_count = 0;
179 int CompileBroker::_total_standard_compile_count = 0;
180
181 int CompileBroker::_sum_osr_bytes_compiled = 0;
182 int CompileBroker::_sum_standard_bytes_compiled = 0;
183 int CompileBroker::_sum_nmethod_size = 0;
184 int CompileBroker::_sum_nmethod_code_size = 0;
185
186 long CompileBroker::_peak_compilation_time = 0;
187
188 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
189 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
190
191 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
192
193
194 class CompilationLog : public StringEventLog {
195 public:
196 CompilationLog() : StringEventLog("Compilation events") {
197 }
198
199 void log_compile(JavaThread* thread, CompileTask* task) {
200 StringLogMessage lm;
201 stringStream sstr = lm.stream();
202 // msg.time_stamp().update_to(tty->time_stamp().ticks());
203 task->print_compilation(&sstr, NULL, true);
204 log(thread, "%s", (const char*)lm);
205 }
206
207 void log_nmethod(JavaThread* thread, nmethod* nm) {
208 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
209 nm->compile_id(), nm->is_osr_method() ? "%" : "",
210 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
211 }
212
213 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
214 StringLogMessage lm;
215 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
216 if (retry_message != NULL) {
217 lm.append(" (%s)", retry_message);
218 }
219 lm.print("\n");
220 log(thread, "%s", (const char*)lm);
221 }
222 };
223
224 static CompilationLog* _compilation_log = NULL;
225
226 void compileBroker_init() {
227 if (LogEvents) {
228 _compilation_log = new CompilationLog();
229 }
230 }
231
232 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
233 CompilerThread* thread = CompilerThread::current();
234 thread->set_task(task);
235 CompileLog* log = thread->log();
236 if (log != NULL) task->log_task_start(log);
237 }
238
239 CompileTaskWrapper::~CompileTaskWrapper() {
240 CompilerThread* thread = CompilerThread::current();
241 CompileTask* task = thread->task();
242 CompileLog* log = thread->log();
243 if (log != NULL) task->log_task_done(log);
244 thread->set_task(NULL);
245 task->set_code_handle(NULL);
246 thread->set_env(NULL);
247 if (task->is_blocking()) {
248 MutexLocker notifier(task->lock(), thread);
249 task->mark_complete();
250 // Notify the waiting thread that the compilation has completed.
251 task->lock()->notify_all();
252 } else {
253 task->mark_complete();
254
255 // By convention, the compiling thread is responsible for
256 // recycling a non-blocking CompileTask.
257 CompileTask::free(task);
258 }
259 }
260
261
262 CompileTask* CompileTask::_task_free_list = NULL;
263 #ifdef ASSERT
264 int CompileTask::_num_allocated_tasks = 0;
265 #endif
266 /**
267 * Allocate a CompileTask, from the free list if possible.
268 */
269 CompileTask* CompileTask::allocate() {
270 MutexLocker locker(CompileTaskAlloc_lock);
271 CompileTask* task = NULL;
272
273 if (_task_free_list != NULL) {
274 task = _task_free_list;
275 _task_free_list = task->next();
276 task->set_next(NULL);
277 } else {
278 task = new CompileTask();
279 DEBUG_ONLY(_num_allocated_tasks++;)
280 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
281 task->set_next(NULL);
282 task->set_is_free(true);
283 }
284 assert(task->is_free(), "Task must be free.");
285 task->set_is_free(false);
286 return task;
287 }
288
289
290 /**
291 * Add a task to the free list.
292 */
293 void CompileTask::free(CompileTask* task) {
294 MutexLocker locker(CompileTaskAlloc_lock);
295 if (!task->is_free()) {
296 task->set_code(NULL);
297 assert(!task->lock()->is_locked(), "Should not be locked when freed");
298 JNIHandles::destroy_global(task->_method_holder);
299 JNIHandles::destroy_global(task->_hot_method_holder);
300
301 task->set_is_free(true);
302 task->set_next(_task_free_list);
303 _task_free_list = task;
304 }
305 }
306
307 void CompileTask::initialize(int compile_id,
308 methodHandle method,
309 int osr_bci,
310 int comp_level,
311 methodHandle hot_method,
312 int hot_count,
313 const char* comment,
314 bool is_blocking) {
315 assert(!_lock->is_locked(), "bad locking");
316
317 _compile_id = compile_id;
318 _method = method();
319 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
320 _osr_bci = osr_bci;
321 _is_blocking = is_blocking;
322 _comp_level = comp_level;
323 _num_inlined_bytecodes = 0;
324
325 _is_complete = false;
326 _is_success = false;
327 _code_handle = NULL;
328
329 _hot_method = NULL;
330 _hot_method_holder = NULL;
331 _hot_count = hot_count;
332 _time_queued = 0; // tidy
333 _comment = comment;
334 _failure_reason = NULL;
335
336 if (LogCompilation) {
337 _time_queued = os::elapsed_counter();
338 if (hot_method.not_null()) {
339 if (hot_method == method) {
340 _hot_method = _method;
341 } else {
342 _hot_method = hot_method();
343 // only add loader or mirror if different from _method_holder
344 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
345 }
346 }
347 }
348
349 _next = NULL;
350 }
351
352 // ------------------------------------------------------------------
353 // CompileTask::code/set_code
354 nmethod* CompileTask::code() const {
355 if (_code_handle == NULL) return NULL;
356 return _code_handle->code();
357 }
358 void CompileTask::set_code(nmethod* nm) {
359 if (_code_handle == NULL && nm == NULL) return;
360 guarantee(_code_handle != NULL, "");
361 _code_handle->set_code(nm);
362 if (nm == NULL) _code_handle = NULL; // drop the handle also
363 }
364
365
366 void CompileTask::mark_on_stack() {
367 // Mark these methods as something redefine classes cannot remove.
368 _method->set_on_stack(true);
369 if (_hot_method != NULL) {
370 _hot_method->set_on_stack(true);
371 }
372 }
373
374 // ------------------------------------------------------------------
375 // CompileTask::print
376 void CompileTask::print() {
377 tty->print("<CompileTask compile_id=%d ", _compile_id);
378 tty->print("method=");
379 _method->print_name(tty);
380 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
381 _osr_bci, bool_to_str(_is_blocking),
382 bool_to_str(_is_complete), bool_to_str(_is_success));
383 }
384
385
386 // ------------------------------------------------------------------
387 // CompileTask::print_line_on_error
388 //
389 // This function is called by fatal error handler when the thread
390 // causing troubles is a compiler thread.
391 //
392 // Do not grab any lock, do not allocate memory.
393 //
394 // Otherwise it's the same as CompileTask::print_line()
395 //
396 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
397 // print compiler name
398 st->print("%s:", CompileBroker::compiler_name(comp_level()));
399 print_compilation(st);
400 }
401
402 // ------------------------------------------------------------------
403 // CompileTask::print_line
404 void CompileTask::print_line() {
405 ttyLocker ttyl; // keep the following output all in one block
406 // print compiler name if requested
407 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
408 print_compilation();
409 }
410
411
412 // ------------------------------------------------------------------
413 // CompileTask::print_compilation_impl
414 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
415 bool is_osr_method, int osr_bci, bool is_blocking,
416 const char* msg, bool short_form) {
417 if (!short_form) {
418 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
419 }
420 st->print("%4d ", compile_id); // print compilation number
421
422 // For unloaded methods the transition to zombie occurs after the
423 // method is cleared so it's impossible to report accurate
424 // information for that case.
425 bool is_synchronized = false;
426 bool has_exception_handler = false;
427 bool is_native = false;
428 if (method != NULL) {
429 is_synchronized = method->is_synchronized();
430 has_exception_handler = method->has_exception_handler();
431 is_native = method->is_native();
432 }
433 // method attributes
434 const char compile_type = is_osr_method ? '%' : ' ';
435 const char sync_char = is_synchronized ? 's' : ' ';
436 const char exception_char = has_exception_handler ? '!' : ' ';
437 const char blocking_char = is_blocking ? 'b' : ' ';
438 const char native_char = is_native ? 'n' : ' ';
439
440 // print method attributes
441 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
442
443 if (TieredCompilation) {
444 if (comp_level != -1) st->print("%d ", comp_level);
445 else st->print("- ");
446 }
447 st->print(" "); // more indent
448
449 if (method == NULL) {
450 st->print("(method)");
451 } else {
452 method->print_short_name(st);
453 if (is_osr_method) {
454 st->print(" @ %d", osr_bci);
455 }
456 if (method->is_native())
457 st->print(" (native)");
458 else
459 st->print(" (%d bytes)", method->code_size());
460 }
461
462 if (msg != NULL) {
463 st->print(" %s", msg);
464 }
465 if (!short_form) {
466 st->cr();
467 }
468 }
469
470 // ------------------------------------------------------------------
471 // CompileTask::print_inlining
472 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
473 // 1234567
474 st->print(" "); // print timestamp
475 // 1234
476 st->print(" "); // print compilation number
477
478 // method attributes
479 if (method->is_loaded()) {
480 const char sync_char = method->is_synchronized() ? 's' : ' ';
481 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
482 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
483
484 // print method attributes
485 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
486 } else {
487 // %s!bn
488 st->print(" "); // print method attributes
489 }
490
491 if (TieredCompilation) {
492 st->print(" ");
493 }
494 st->print(" "); // more indent
495 st->print(" "); // initial inlining indent
496
497 for (int i = 0; i < inline_level; i++) st->print(" ");
498
499 st->print("@ %d ", bci); // print bci
500 method->print_short_name(st);
501 if (method->is_loaded())
502 st->print(" (%d bytes)", method->code_size());
503 else
504 st->print(" (not loaded)");
505
506 if (msg != NULL) {
507 st->print(" %s", msg);
508 }
509 st->cr();
510 }
511
512 // ------------------------------------------------------------------
513 // CompileTask::print_inline_indent
514 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
515 // 1234567
516 st->print(" "); // print timestamp
517 // 1234
518 st->print(" "); // print compilation number
519 // %s!bn
520 st->print(" "); // print method attributes
521 if (TieredCompilation) {
522 st->print(" ");
523 }
524 st->print(" "); // more indent
525 st->print(" "); // initial inlining indent
526 for (int i = 0; i < inline_level; i++) st->print(" ");
527 }
528
529 // ------------------------------------------------------------------
530 // CompileTask::print_compilation
531 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
532 bool is_osr_method = osr_bci() != InvocationEntryBci;
533 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
534 }
535
536 // ------------------------------------------------------------------
537 // CompileTask::log_task
538 void CompileTask::log_task(xmlStream* log) {
539 Thread* thread = Thread::current();
540 methodHandle method(thread, this->method());
541 ResourceMark rm(thread);
542
543 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
544 log->print(" compile_id='%d'", _compile_id);
545 if (_osr_bci != CompileBroker::standard_entry_bci) {
546 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
547 } // else compile_kind='c2c'
548 if (!method.is_null()) log->method(method);
549 if (_osr_bci != CompileBroker::standard_entry_bci) {
550 log->print(" osr_bci='%d'", _osr_bci);
551 }
552 if (_comp_level != CompLevel_highest_tier) {
553 log->print(" level='%d'", _comp_level);
554 }
555 if (_is_blocking) {
556 log->print(" blocking='1'");
557 }
558 log->stamp();
559 }
560
561
562 // ------------------------------------------------------------------
563 // CompileTask::log_task_queued
564 void CompileTask::log_task_queued() {
565 Thread* thread = Thread::current();
566 ttyLocker ttyl;
567 ResourceMark rm(thread);
568
569 xtty->begin_elem("task_queued");
570 log_task(xtty);
571 if (_comment != NULL) {
572 xtty->print(" comment='%s'", _comment);
573 }
574 if (_hot_method != NULL) {
575 methodHandle hot(thread, _hot_method);
576 methodHandle method(thread, _method);
577 if (hot() != method()) {
578 xtty->method(hot);
579 }
580 }
581 if (_hot_count != 0) {
582 xtty->print(" hot_count='%d'", _hot_count);
583 }
584 xtty->end_elem();
585 }
586
587
588 // ------------------------------------------------------------------
589 // CompileTask::log_task_start
590 void CompileTask::log_task_start(CompileLog* log) {
591 log->begin_head("task");
592 log_task(log);
593 log->end_head();
594 }
595
596
597 // ------------------------------------------------------------------
598 // CompileTask::log_task_done
599 void CompileTask::log_task_done(CompileLog* log) {
600 Thread* thread = Thread::current();
601 methodHandle method(thread, this->method());
602 ResourceMark rm(thread);
603
604 if (!_is_success) {
605 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
606 log->elem("failure reason='%s'", reason);
607 }
608
609 // <task_done ... stamp='1.234'> </task>
610 nmethod* nm = code();
611 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
612 _is_success, nm == NULL ? 0 : nm->content_size(),
613 method->invocation_count());
614 int bec = method->backedge_count();
615 if (bec != 0) log->print(" backedge_count='%d'", bec);
616 // Note: "_is_complete" is about to be set, but is not.
617 if (_num_inlined_bytecodes != 0) {
618 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
619 }
620 log->stamp();
621 log->end_elem();
622 log->tail("task");
623 log->clear_identities(); // next task will have different CI
624 if (log->unflushed_count() > 2000) {
625 log->flush();
626 }
627 log->mark_file_end();
628 }
629
630
631
632 /**
633 * Add a CompileTask to a CompileQueue
634 */
635 void CompileQueue::add(CompileTask* task) {
636 assert(lock()->owned_by_self(), "must own lock");
637 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
638
639 task->set_next(NULL);
640 task->set_prev(NULL);
641
642 if (_last == NULL) {
643 // The compile queue is empty.
644 assert(_first == NULL, "queue is empty");
645 _first = task;
646 _last = task;
647 } else {
648 // Append the task to the queue.
649 assert(_last->next() == NULL, "not last");
650 _last->set_next(task);
651 task->set_prev(_last);
652 _last = task;
653 }
654 ++_size;
655
656 // Mark the method as being in the compile queue.
657 task->method()->set_queued_for_compilation();
658
659 NOT_PRODUCT(print();)
660
661 if (LogCompilation && xtty != NULL) {
662 task->log_task_queued();
663 }
664
665 // Notify CompilerThreads that a task is available.
666 lock()->notify_all();
667 }
668
669 /**
670 * Empties compilation queue by putting all compilation tasks onto
671 * a freelist. Furthermore, the method wakes up all threads that are
672 * waiting on a compilation task to finish. This can happen if background
673 * compilation is disabled.
674 */
675 void CompileQueue::free_all() {
676 MutexLocker mu(lock());
677 CompileTask* next = _first;
678
679 // Iterate over all tasks in the compile queue
680 while (next != NULL) {
681 CompileTask* current = next;
682 next = current->next();
683 {
684 // Wake up thread that blocks on the compile task.
685 MutexLocker ct_lock(current->lock());
686 current->lock()->notify();
687 }
688 // Put the task back on the freelist.
689 CompileTask::free(current);
690 }
691 _first = NULL;
692
693 // Wake up all threads that block on the queue.
694 lock()->notify_all();
695 }
696
697 // ------------------------------------------------------------------
698 // CompileQueue::get
699 //
700 // Get the next CompileTask from a CompileQueue
701 CompileTask* CompileQueue::get() {
702 NMethodSweeper::possibly_sweep();
703
704 MutexLocker locker(lock());
705 // If _first is NULL we have no more compile jobs. There are two reasons for
706 // having no compile jobs: First, we compiled everything we wanted. Second,
707 // we ran out of code cache so compilation has been disabled. In the latter
708 // case we perform code cache sweeps to free memory such that we can re-enable
709 // compilation.
710 while (_first == NULL) {
711 // Exit loop if compilation is disabled forever
712 if (CompileBroker::is_compilation_disabled_forever()) {
713 return NULL;
714 }
715
716 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
717 // Wait a certain amount of time to possibly do another sweep.
718 // We must wait until stack scanning has happened so that we can
719 // transition a method's state from 'not_entrant' to 'zombie'.
720 long wait_time = NmethodSweepCheckInterval * 1000;
721 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
722 // Only one thread at a time can do sweeping. Scale the
723 // wait time according to the number of compiler threads.
724 // As a result, the next sweep is likely to happen every 100ms
725 // with an arbitrary number of threads that do sweeping.
726 wait_time = 100 * CICompilerCount;
727 }
728 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
729 if (timeout) {
730 MutexUnlocker ul(lock());
731 NMethodSweeper::possibly_sweep();
732 }
733 } else {
734 // If there are no compilation tasks and we can compile new jobs
735 // (i.e., there is enough free space in the code cache) there is
736 // no need to invoke the sweeper. As a result, the hotness of methods
737 // remains unchanged. This behavior is desired, since we want to keep
738 // the stable state, i.e., we do not want to evict methods from the
739 // code cache if it is unnecessary.
740 // We need a timed wait here, since compiler threads can exit if compilation
741 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
742 // is not critical and we do not want idle compiler threads to wake up too often.
743 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
744 }
745 }
746
747 if (CompileBroker::is_compilation_disabled_forever()) {
748 return NULL;
749 }
750
751 CompileTask* task;
752 {
753 No_Safepoint_Verifier nsv;
754 task = CompilationPolicy::policy()->select_task(this);
755 }
756 if (task != NULL) {
757 remove(task);
758 }
759 purge_stale_tasks(); // may temporarily release MCQ lock
760 return task;
761 }
762
763 // Clean & deallocate stale compile tasks.
764 // Temporarily releases MethodCompileQueue lock.
765 void CompileQueue::purge_stale_tasks() {
766 assert(lock()->owned_by_self(), "must own lock");
767 if (_first_stale != NULL) {
768 // Stale tasks are purged when MCQ lock is released,
769 // but _first_stale updates are protected by MCQ lock.
770 // Once task processing starts and MCQ lock is released,
771 // other compiler threads can reuse _first_stale.
772 CompileTask* head = _first_stale;
773 _first_stale = NULL;
774 {
775 MutexUnlocker ul(lock());
776 for (CompileTask* task = head; task != NULL; ) {
777 CompileTask* next_task = task->next();
778 CompileTaskWrapper ctw(task); // Frees the task
779 task->set_failure_reason("stale task");
780 task = next_task;
781 }
782 }
783 }
784 }
785
786 void CompileQueue::remove(CompileTask* task) {
787 assert(lock()->owned_by_self(), "must own lock");
788 if (task->prev() != NULL) {
789 task->prev()->set_next(task->next());
790 } else {
791 // max is the first element
792 assert(task == _first, "Sanity");
793 _first = task->next();
794 }
795
796 if (task->next() != NULL) {
797 task->next()->set_prev(task->prev());
798 } else {
799 // max is the last element
800 assert(task == _last, "Sanity");
801 _last = task->prev();
802 }
803 --_size;
804 }
805
806 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
807 assert(lock()->owned_by_self(), "must own lock");
808 remove(task);
809
810 // Enqueue the task for reclamation (should be done outside MCQ lock)
811 task->set_next(_first_stale);
812 task->set_prev(NULL);
813 _first_stale = task;
814 }
815
816 // methods in the compile queue need to be marked as used on the stack
817 // so that they don't get reclaimed by Redefine Classes
818 void CompileQueue::mark_on_stack() {
819 CompileTask* task = _first;
820 while (task != NULL) {
821 task->mark_on_stack();
822 task = task->next();
823 }
824 }
825
826 #ifndef PRODUCT
827 /**
828 * Print entire compilation queue.
829 */
830 void CompileQueue::print() {
831 if (CIPrintCompileQueue) {
832 ttyLocker ttyl;
833 tty->print_cr("Contents of %s", name());
834 tty->print_cr("----------------------");
835 CompileTask* task = _first;
836 while (task != NULL) {
837 task->print_line();
838 task = task->next();
839 }
840 tty->print_cr("----------------------");
841 }
842 }
843 #endif // PRODUCT
844
845 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
846
847 _current_method[0] = '\0';
848 _compile_type = CompileBroker::no_compile;
849
850 if (UsePerfData) {
851 ResourceMark rm;
852
853 // create the thread instance name space string - don't create an
854 // instance subspace if instance is -1 - keeps the adapterThread
855 // counters from having a ".0" namespace.
856 const char* thread_i = (instance == -1) ? thread_name :
857 PerfDataManager::name_space(thread_name, instance);
858
859
860 char* name = PerfDataManager::counter_name(thread_i, "method");
861 _perf_current_method =
862 PerfDataManager::create_string_variable(SUN_CI, name,
863 cmname_buffer_length,
864 _current_method, CHECK);
865
866 name = PerfDataManager::counter_name(thread_i, "type");
867 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
868 PerfData::U_None,
869 (jlong)_compile_type,
870 CHECK);
871
872 name = PerfDataManager::counter_name(thread_i, "time");
873 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
874 PerfData::U_Ticks, CHECK);
875
876 name = PerfDataManager::counter_name(thread_i, "compiles");
877 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
878 PerfData::U_Events, CHECK);
879 }
880 }
881
882 // ------------------------------------------------------------------
883 // CompileBroker::compilation_init
884 //
885 // Initialize the Compilation object
886 void CompileBroker::compilation_init() {
887 _last_method_compiled[0] = '\0';
888
889 // No need to initialize compilation system if we do not use it.
890 if (!UseCompiler) {
891 return;
892 }
893 #ifndef SHARK
894 // Set the interface to the current compiler(s).
895 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
896 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
897 #ifdef COMPILER1
898 if (c1_count > 0) {
899 _compilers[0] = new Compiler();
900 }
901 #endif // COMPILER1
902
903 #ifdef COMPILER2
904 if (c2_count > 0) {
905 _compilers[1] = new C2Compiler();
906 }
907 #endif // COMPILER2
908
909 #else // SHARK
910 int c1_count = 0;
911 int c2_count = 1;
912
913 _compilers[1] = new SharkCompiler();
914 #endif // SHARK
915
916 // Start the CompilerThreads
917 init_compiler_threads(c1_count, c2_count);
918 // totalTime performance counter is always created as it is required
919 // by the implementation of java.lang.management.CompilationMBean.
920 {
921 EXCEPTION_MARK;
922 _perf_total_compilation =
923 PerfDataManager::create_counter(JAVA_CI, "totalTime",
924 PerfData::U_Ticks, CHECK);
925 }
926
927
928 if (UsePerfData) {
929
930 EXCEPTION_MARK;
931
932 // create the jvmstat performance counters
933 _perf_osr_compilation =
934 PerfDataManager::create_counter(SUN_CI, "osrTime",
935 PerfData::U_Ticks, CHECK);
936
937 _perf_standard_compilation =
938 PerfDataManager::create_counter(SUN_CI, "standardTime",
939 PerfData::U_Ticks, CHECK);
940
941 _perf_total_bailout_count =
942 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
943 PerfData::U_Events, CHECK);
944
945 _perf_total_invalidated_count =
946 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
947 PerfData::U_Events, CHECK);
948
949 _perf_total_compile_count =
950 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
951 PerfData::U_Events, CHECK);
952 _perf_total_osr_compile_count =
953 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
954 PerfData::U_Events, CHECK);
955
956 _perf_total_standard_compile_count =
957 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
958 PerfData::U_Events, CHECK);
959
960 _perf_sum_osr_bytes_compiled =
961 PerfDataManager::create_counter(SUN_CI, "osrBytes",
962 PerfData::U_Bytes, CHECK);
963
964 _perf_sum_standard_bytes_compiled =
965 PerfDataManager::create_counter(SUN_CI, "standardBytes",
966 PerfData::U_Bytes, CHECK);
967
968 _perf_sum_nmethod_size =
969 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
970 PerfData::U_Bytes, CHECK);
971
972 _perf_sum_nmethod_code_size =
973 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
974 PerfData::U_Bytes, CHECK);
975
976 _perf_last_method =
977 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
978 CompilerCounters::cmname_buffer_length,
979 "", CHECK);
980
981 _perf_last_failed_method =
982 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
983 CompilerCounters::cmname_buffer_length,
984 "", CHECK);
985
986 _perf_last_invalidated_method =
987 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
988 CompilerCounters::cmname_buffer_length,
989 "", CHECK);
990
991 _perf_last_compile_type =
992 PerfDataManager::create_variable(SUN_CI, "lastType",
993 PerfData::U_None,
994 (jlong)CompileBroker::no_compile,
995 CHECK);
996
997 _perf_last_compile_size =
998 PerfDataManager::create_variable(SUN_CI, "lastSize",
999 PerfData::U_Bytes,
1000 (jlong)CompileBroker::no_compile,
1001 CHECK);
1002
1003
1004 _perf_last_failed_type =
1005 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
1006 PerfData::U_None,
1007 (jlong)CompileBroker::no_compile,
1008 CHECK);
1009
1010 _perf_last_invalidated_type =
1011 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1012 PerfData::U_None,
1013 (jlong)CompileBroker::no_compile,
1014 CHECK);
1015 }
1016
1017 _initialized = true;
1018 }
1019
1020
1021 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1022 AbstractCompiler* comp, TRAPS) {
1023 CompilerThread* compiler_thread = NULL;
1024
1025 Klass* k =
1026 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1027 true, CHECK_0);
1028 instanceKlassHandle klass (THREAD, k);
1029 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1030 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1031
1032 // Initialize thread_oop to put it into the system threadGroup
1033 Handle thread_group (THREAD, Universe::system_thread_group());
1034 JavaValue result(T_VOID);
1035 JavaCalls::call_special(&result, thread_oop,
1036 klass,
1037 vmSymbols::object_initializer_name(),
1038 vmSymbols::threadgroup_string_void_signature(),
1039 thread_group,
1040 string,
1041 CHECK_0);
1042
1043 {
1044 MutexLocker mu(Threads_lock, THREAD);
1045 compiler_thread = new CompilerThread(queue, counters);
1046 // At this point the new CompilerThread data-races with this startup
1047 // thread (which I believe is the primoridal thread and NOT the VM
1048 // thread). This means Java bytecodes being executed at startup can
1049 // queue compile jobs which will run at whatever default priority the
1050 // newly created CompilerThread runs at.
1051
1052
1053 // At this point it may be possible that no osthread was created for the
1054 // JavaThread due to lack of memory. We would have to throw an exception
1055 // in that case. However, since this must work and we do not allow
1056 // exceptions anyway, check and abort if this fails.
1057
1058 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1059 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1060 "unable to create new native thread");
1061 }
1062
1063 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1064
1065 // Note that this only sets the JavaThread _priority field, which by
1066 // definition is limited to Java priorities and not OS priorities.
1067 // The os-priority is set in the CompilerThread startup code itself
1068
1069 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1070
1071 // Note that we cannot call os::set_priority because it expects Java
1072 // priorities and we are *explicitly* using OS priorities so that it's
1073 // possible to set the compiler thread priority higher than any Java
1074 // thread.
1075
1076 int native_prio = CompilerThreadPriority;
1077 if (native_prio == -1) {
1078 if (UseCriticalCompilerThreadPriority) {
1079 native_prio = os::java_to_os_priority[CriticalPriority];
1080 } else {
1081 native_prio = os::java_to_os_priority[NearMaxPriority];
1082 }
1083 }
1084 os::set_native_priority(compiler_thread, native_prio);
1085
1086 java_lang_Thread::set_daemon(thread_oop());
1087
1088 compiler_thread->set_threadObj(thread_oop());
1089 compiler_thread->set_compiler(comp);
1090 Threads::add(compiler_thread);
1091 Thread::start(compiler_thread);
1092 }
1093
1094 // Let go of Threads_lock before yielding
1095 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1096
1097 return compiler_thread;
1098 }
1099
1100
1101 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1102 EXCEPTION_MARK;
1103 #if !defined(ZERO) && !defined(SHARK)
1104 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1105 #endif // !ZERO && !SHARK
1106 // Initialize the compilation queue
1107 if (c2_compiler_count > 0) {
1108 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1109 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1110 }
1111 if (c1_compiler_count > 0) {
1112 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1113 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1114 }
1115
1116 int compiler_count = c1_compiler_count + c2_compiler_count;
1117
1118 _compiler_threads =
1119 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1120
1121 char name_buffer[256];
1122 for (int i = 0; i < c2_compiler_count; i++) {
1123 // Create a name for our thread.
1124 sprintf(name_buffer, "C2 CompilerThread%d", i);
1125 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1126 // Shark and C2
1127 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1128 _compiler_threads->append(new_thread);
1129 }
1130
1131 for (int i = c2_compiler_count; i < compiler_count; i++) {
1132 // Create a name for our thread.
1133 sprintf(name_buffer, "C1 CompilerThread%d", i);
1134 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1135 // C1
1136 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1137 _compiler_threads->append(new_thread);
1138 }
1139
1140 if (UsePerfData) {
1141 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1142 }
1143 }
1144
1145
1146 /**
1147 * Set the methods on the stack as on_stack so that redefine classes doesn't
1148 * reclaim them. This method is executed at a safepoint.
1149 */
1150 void CompileBroker::mark_on_stack() {
1151 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1152 // Since we are at a safepoint, we do not need a lock to access
1153 // the compile queues.
1154 if (_c2_compile_queue != NULL) {
1155 _c2_compile_queue->mark_on_stack();
1156 }
1157 if (_c1_compile_queue != NULL) {
1158 _c1_compile_queue->mark_on_stack();
1159 }
1160 }
1161
1162 // ------------------------------------------------------------------
1163 // CompileBroker::compile_method
1164 //
1165 // Request compilation of a method.
1166 void CompileBroker::compile_method_base(methodHandle method,
1167 int osr_bci,
1168 int comp_level,
1169 methodHandle hot_method,
1170 int hot_count,
1171 const char* comment,
1172 Thread* thread) {
1173 // do nothing if compiler thread(s) is not available
1174 if (!_initialized) {
1175 return;
1176 }
1177
1178 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1179 assert(method->method_holder()->oop_is_instance(),
1180 "sanity check");
1181 assert(!method->method_holder()->is_not_initialized(),
1182 "method holder must be initialized");
1183 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1184
1185 if (CIPrintRequests) {
1186 tty->print("request: ");
1187 method->print_short_name(tty);
1188 if (osr_bci != InvocationEntryBci) {
1189 tty->print(" osr_bci: %d", osr_bci);
1190 }
1191 tty->print(" comment: %s count: %d", comment, hot_count);
1192 if (!hot_method.is_null()) {
1193 tty->print(" hot: ");
1194 if (hot_method() != method()) {
1195 hot_method->print_short_name(tty);
1196 } else {
1197 tty->print("yes");
1198 }
1199 }
1200 tty->cr();
1201 }
1202
1203 // A request has been made for compilation. Before we do any
1204 // real work, check to see if the method has been compiled
1205 // in the meantime with a definitive result.
1206 if (compilation_is_complete(method, osr_bci, comp_level)) {
1207 return;
1208 }
1209
1210 #ifndef PRODUCT
1211 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1212 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1213 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1214 return;
1215 }
1216 }
1217 #endif
1218
1219 // If this method is already in the compile queue, then
1220 // we do not block the current thread.
1221 if (compilation_is_in_queue(method)) {
1222 // We may want to decay our counter a bit here to prevent
1223 // multiple denied requests for compilation. This is an
1224 // open compilation policy issue. Note: The other possibility,
1225 // in the case that this is a blocking compile request, is to have
1226 // all subsequent blocking requesters wait for completion of
1227 // ongoing compiles. Note that in this case we'll need a protocol
1228 // for freeing the associated compile tasks. [Or we could have
1229 // a single static monitor on which all these waiters sleep.]
1230 return;
1231 }
1232
1233 // If the requesting thread is holding the pending list lock
1234 // then we just return. We can't risk blocking while holding
1235 // the pending list lock or a 3-way deadlock may occur
1236 // between the reference handler thread, a GC (instigated
1237 // by a compiler thread), and compiled method registration.
1238 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1239 return;
1240 }
1241
1242 if (TieredCompilation) {
1243 // Tiered policy requires MethodCounters to exist before adding a method to
1244 // the queue. Create if we don't have them yet.
1245 method->get_method_counters(thread);
1246 }
1247
1248 // Outputs from the following MutexLocker block:
1249 CompileTask* task = NULL;
1250 bool blocking = false;
1251 CompileQueue* queue = compile_queue(comp_level);
1252
1253 // Acquire our lock.
1254 {
1255 MutexLocker locker(queue->lock(), thread);
1256
1257 // Make sure the method has not slipped into the queues since
1258 // last we checked; note that those checks were "fast bail-outs".
1259 // Here we need to be more careful, see 14012000 below.
1260 if (compilation_is_in_queue(method)) {
1261 return;
1262 }
1263
1264 // We need to check again to see if the compilation has
1265 // completed. A previous compilation may have registered
1266 // some result.
1267 if (compilation_is_complete(method, osr_bci, comp_level)) {
1268 return;
1269 }
1270
1271 // We now know that this compilation is not pending, complete,
1272 // or prohibited. Assign a compile_id to this compilation
1273 // and check to see if it is in our [Start..Stop) range.
1274 int compile_id = assign_compile_id(method, osr_bci);
1275 if (compile_id == 0) {
1276 // The compilation falls outside the allowed range.
1277 return;
1278 }
1279
1280 // Should this thread wait for completion of the compile?
1281 blocking = is_compile_blocking();
1282
1283 // We will enter the compilation in the queue.
1284 // 14012000: Note that this sets the queued_for_compile bits in
1285 // the target method. We can now reason that a method cannot be
1286 // queued for compilation more than once, as follows:
1287 // Before a thread queues a task for compilation, it first acquires
1288 // the compile queue lock, then checks if the method's queued bits
1289 // are set or it has already been compiled. Thus there can not be two
1290 // instances of a compilation task for the same method on the
1291 // compilation queue. Consider now the case where the compilation
1292 // thread has already removed a task for that method from the queue
1293 // and is in the midst of compiling it. In this case, the
1294 // queued_for_compile bits must be set in the method (and these
1295 // will be visible to the current thread, since the bits were set
1296 // under protection of the compile queue lock, which we hold now.
1297 // When the compilation completes, the compiler thread first sets
1298 // the compilation result and then clears the queued_for_compile
1299 // bits. Neither of these actions are protected by a barrier (or done
1300 // under the protection of a lock), so the only guarantee we have
1301 // (on machines with TSO (Total Store Order)) is that these values
1302 // will update in that order. As a result, the only combinations of
1303 // these bits that the current thread will see are, in temporal order:
1304 // <RESULT, QUEUE> :
1305 // <0, 1> : in compile queue, but not yet compiled
1306 // <1, 1> : compiled but queue bit not cleared
1307 // <1, 0> : compiled and queue bit cleared
1308 // Because we first check the queue bits then check the result bits,
1309 // we are assured that we cannot introduce a duplicate task.
1310 // Note that if we did the tests in the reverse order (i.e. check
1311 // result then check queued bit), we could get the result bit before
1312 // the compilation completed, and the queue bit after the compilation
1313 // completed, and end up introducing a "duplicate" (redundant) task.
1314 // In that case, the compiler thread should first check if a method
1315 // has already been compiled before trying to compile it.
1316 // NOTE: in the event that there are multiple compiler threads and
1317 // there is de-optimization/recompilation, things will get hairy,
1318 // and in that case it's best to protect both the testing (here) of
1319 // these bits, and their updating (here and elsewhere) under a
1320 // common lock.
1321 task = create_compile_task(queue,
1322 compile_id, method,
1323 osr_bci, comp_level,
1324 hot_method, hot_count, comment,
1325 blocking);
1326 }
1327
1328 if (blocking) {
1329 wait_for_completion(task);
1330 }
1331 }
1332
1333
1334 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1335 int comp_level,
1336 methodHandle hot_method, int hot_count,
1337 const char* comment, Thread* THREAD) {
1338 // make sure arguments make sense
1339 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1340 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1341 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1342 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1343 // allow any levels for WhiteBox
1344 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1345 // return quickly if possible
1346
1347 // lock, make sure that the compilation
1348 // isn't prohibited in a straightforward way.
1349 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1350 if (comp == NULL || !comp->can_compile_method(method) ||
1351 compilation_is_prohibited(method, osr_bci, comp_level)) {
1352 return NULL;
1353 }
1354
1355 if (osr_bci == InvocationEntryBci) {
1356 // standard compilation
1357 nmethod* method_code = method->code();
1358 if (method_code != NULL) {
1359 if (compilation_is_complete(method, osr_bci, comp_level)) {
1360 return method_code;
1361 }
1362 }
1363 if (method->is_not_compilable(comp_level)) {
1364 return NULL;
1365 }
1366 } else {
1367 // osr compilation
1368 #ifndef TIERED
1369 // seems like an assert of dubious value
1370 assert(comp_level == CompLevel_highest_tier,
1371 "all OSR compiles are assumed to be at a single compilation lavel");
1372 #endif // TIERED
1373 // We accept a higher level osr method
1374 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1375 if (nm != NULL) return nm;
1376 if (method->is_not_osr_compilable(comp_level)) return NULL;
1377 }
1378
1379 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1380 // some prerequisites that are compiler specific
1381 if (comp->is_c2() || comp->is_shark()) {
1382 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1383 // Resolve all classes seen in the signature of the method
1384 // we are compiling.
1385 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1386 }
1387
1388 // If the method is native, do the lookup in the thread requesting
1389 // the compilation. Native lookups can load code, which is not
1390 // permitted during compilation.
1391 //
1392 // Note: A native method implies non-osr compilation which is
1393 // checked with an assertion at the entry of this method.
1394 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1395 bool in_base_library;
1396 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1397 if (HAS_PENDING_EXCEPTION) {
1398 // In case of an exception looking up the method, we just forget
1399 // about it. The interpreter will kick-in and throw the exception.
1400 method->set_not_compilable(); // implies is_not_osr_compilable()
1401 CLEAR_PENDING_EXCEPTION;
1402 return NULL;
1403 }
1404 assert(method->has_native_function(), "must have native code by now");
1405 }
1406
1407 // RedefineClasses() has replaced this method; just return
1408 if (method->is_old()) {
1409 return NULL;
1410 }
1411
1412 // JVMTI -- post_compile_event requires jmethod_id() that may require
1413 // a lock the compiling thread can not acquire. Prefetch it here.
1414 if (JvmtiExport::should_post_compiled_method_load()) {
1415 method->jmethod_id();
1416 }
1417
1418 // do the compilation
1419 if (method->is_native()) {
1420 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1421 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1422 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1423 //
1424 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1425 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1426 AdapterHandlerLibrary::create_native_wrapper(method);
1427 } else {
1428 return NULL;
1429 }
1430 } else {
1431 // If the compiler is shut off due to code cache getting full
1432 // fail out now so blocking compiles dont hang the java thread
1433 if (!should_compile_new_jobs()) {
1434 CompilationPolicy::policy()->delay_compilation(method());
1435 return NULL;
1436 }
1437 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1438 }
1439
1440 // return requested nmethod
1441 // We accept a higher level osr method
1442 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1443 }
1444
1445
1446 // ------------------------------------------------------------------
1447 // CompileBroker::compilation_is_complete
1448 //
1449 // See if compilation of this method is already complete.
1450 bool CompileBroker::compilation_is_complete(methodHandle method,
1451 int osr_bci,
1452 int comp_level) {
1453 bool is_osr = (osr_bci != standard_entry_bci);
1454 if (is_osr) {
1455 if (method->is_not_osr_compilable(comp_level)) {
1456 return true;
1457 } else {
1458 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1459 return (result != NULL);
1460 }
1461 } else {
1462 if (method->is_not_compilable(comp_level)) {
1463 return true;
1464 } else {
1465 nmethod* result = method->code();
1466 if (result == NULL) return false;
1467 return comp_level == result->comp_level();
1468 }
1469 }
1470 }
1471
1472
1473 /**
1474 * See if this compilation is already requested.
1475 *
1476 * Implementation note: there is only a single "is in queue" bit
1477 * for each method. This means that the check below is overly
1478 * conservative in the sense that an osr compilation in the queue
1479 * will block a normal compilation from entering the queue (and vice
1480 * versa). This can be remedied by a full queue search to disambiguate
1481 * cases. If it is deemed profitable, this may be done.
1482 */
1483 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1484 return method->queued_for_compilation();
1485 }
1486
1487 // ------------------------------------------------------------------
1488 // CompileBroker::compilation_is_prohibited
1489 //
1490 // See if this compilation is not allowed.
1491 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1492 bool is_native = method->is_native();
1493 // Some compilers may not support the compilation of natives.
1494 AbstractCompiler *comp = compiler(comp_level);
1495 if (is_native &&
1496 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1497 method->set_not_compilable_quietly(comp_level);
1498 return true;
1499 }
1500
1501 bool is_osr = (osr_bci != standard_entry_bci);
1502 // Some compilers may not support on stack replacement.
1503 if (is_osr &&
1504 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1505 method->set_not_osr_compilable(comp_level);
1506 return true;
1507 }
1508
1509 // The method may be explicitly excluded by the user.
1510 bool quietly;
1511 if (CompilerOracle::should_exclude(method, quietly)) {
1512 if (!quietly) {
1513 // This does not happen quietly...
1514 ResourceMark rm;
1515 tty->print("### Excluding %s:%s",
1516 method->is_native() ? "generation of native wrapper" : "compile",
1517 (method->is_static() ? " static" : ""));
1518 method->print_short_name(tty);
1519 tty->cr();
1520 }
1521 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1522 }
1523
1524 return false;
1525 }
1526
1527 /**
1528 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1529 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1530 * The function also allows to generate separate compilation IDs for OSR compilations.
1531 */
1532 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1533 #ifdef ASSERT
1534 bool is_osr = (osr_bci != standard_entry_bci);
1535 int id;
1536 if (method->is_native()) {
1537 assert(!is_osr, "can't be osr");
1538 // Adapters, native wrappers and method handle intrinsics
1539 // should be generated always.
1540 return Atomic::add(1, &_compilation_id);
1541 } else if (CICountOSR && is_osr) {
1542 id = Atomic::add(1, &_osr_compilation_id);
1543 if (CIStartOSR <= id && id < CIStopOSR) {
1544 return id;
1545 }
1546 } else {
1547 id = Atomic::add(1, &_compilation_id);
1548 if (CIStart <= id && id < CIStop) {
1549 return id;
1550 }
1551 }
1552
1553 // Method was not in the appropriate compilation range.
1554 method->set_not_compilable_quietly();
1555 return 0;
1556 #else
1557 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1558 // only _compilation_id is incremented.
1559 return Atomic::add(1, &_compilation_id);
1560 #endif
1561 }
1562
1563 /**
1564 * Should the current thread block until this compilation request
1565 * has been fulfilled?
1566 */
1567 bool CompileBroker::is_compile_blocking() {
1568 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1569 return !BackgroundCompilation;
1570 }
1571
1572
1573 // ------------------------------------------------------------------
1574 // CompileBroker::preload_classes
1575 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1576 // Move this code over from c1_Compiler.cpp
1577 ShouldNotReachHere();
1578 }
1579
1580
1581 // ------------------------------------------------------------------
1582 // CompileBroker::create_compile_task
1583 //
1584 // Create a CompileTask object representing the current request for
1585 // compilation. Add this task to the queue.
1586 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1587 int compile_id,
1588 methodHandle method,
1589 int osr_bci,
1590 int comp_level,
1591 methodHandle hot_method,
1592 int hot_count,
1593 const char* comment,
1594 bool blocking) {
1595 CompileTask* new_task = CompileTask::allocate();
1596 new_task->initialize(compile_id, method, osr_bci, comp_level,
1597 hot_method, hot_count, comment,
1598 blocking);
1599 queue->add(new_task);
1600 return new_task;
1601 }
1602
1603
1604 /**
1605 * Wait for the compilation task to complete.
1606 */
1607 void CompileBroker::wait_for_completion(CompileTask* task) {
1608 if (CIPrintCompileQueue) {
1609 ttyLocker ttyl;
1610 tty->print_cr("BLOCKING FOR COMPILE");
1611 }
1612
1613 assert(task->is_blocking(), "can only wait on blocking task");
1614
1615 JavaThread* thread = JavaThread::current();
1616 thread->set_blocked_on_compilation(true);
1617
1618 methodHandle method(thread, task->method());
1619 {
1620 MutexLocker waiter(task->lock(), thread);
1621
1622 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1623 task->lock()->wait();
1624 }
1625 }
1626
1627 thread->set_blocked_on_compilation(false);
1628 if (is_compilation_disabled_forever()) {
1629 CompileTask::free(task);
1630 return;
1631 }
1632
1633 // It is harmless to check this status without the lock, because
1634 // completion is a stable property (until the task object is recycled).
1635 assert(task->is_complete(), "Compilation should have completed");
1636 assert(task->code_handle() == NULL, "must be reset");
1637
1638 // By convention, the waiter is responsible for recycling a
1639 // blocking CompileTask. Since there is only one waiter ever
1640 // waiting on a CompileTask, we know that no one else will
1641 // be using this CompileTask; we can free it.
1642 CompileTask::free(task);
1643 }
1644
1645 /**
1646 * Initialize compiler thread(s) + compiler object(s). The postcondition
1647 * of this function is that the compiler runtimes are initialized and that
1648 * compiler threads can start compiling.
1649 */
1650 bool CompileBroker::init_compiler_runtime() {
1651 CompilerThread* thread = CompilerThread::current();
1652 AbstractCompiler* comp = thread->compiler();
1653 // Final sanity check - the compiler object must exist
1654 guarantee(comp != NULL, "Compiler object must exist");
1655
1656 int system_dictionary_modification_counter;
1657 {
1658 MutexLocker locker(Compile_lock, thread);
1659 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1660 }
1661
1662 {
1663 // Must switch to native to allocate ci_env
1664 ThreadToNativeFromVM ttn(thread);
1665 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1666 // Cache Jvmti state
1667 ci_env.cache_jvmti_state();
1668 // Cache DTrace flags
1669 ci_env.cache_dtrace_flags();
1670
1671 // Switch back to VM state to do compiler initialization
1672 ThreadInVMfromNative tv(thread);
1673 ResetNoHandleMark rnhm;
1674
1675
1676 if (!comp->is_shark()) {
1677 // Perform per-thread and global initializations
1678 comp->initialize();
1679 }
1680 }
1681
1682 if (comp->is_failed()) {
1683 disable_compilation_forever();
1684 // If compiler initialization failed, no compiler thread that is specific to a
1685 // particular compiler runtime will ever start to compile methods.
1686 shutdown_compiler_runtime(comp, thread);
1687 return false;
1688 }
1689
1690 // C1 specific check
1691 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1692 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1693 return false;
1694 }
1695
1696 return true;
1697 }
1698
1699 /**
1700 * If C1 and/or C2 initialization failed, we shut down all compilation.
1701 * We do this to keep things simple. This can be changed if it ever turns
1702 * out to be a problem.
1703 */
1704 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1705 // Free buffer blob, if allocated
1706 if (thread->get_buffer_blob() != NULL) {
1707 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1708 CodeCache::free(thread->get_buffer_blob());
1709 }
1710
1711 if (comp->should_perform_shutdown()) {
1712 // There are two reasons for shutting down the compiler
1713 // 1) compiler runtime initialization failed
1714 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1715 warning("%s initialization failed. Shutting down all compilers", comp->name());
1716
1717 // Only one thread per compiler runtime object enters here
1718 // Set state to shut down
1719 comp->set_shut_down();
1720
1721 // Delete all queued compilation tasks to make compiler threads exit faster.
1722 if (_c1_compile_queue != NULL) {
1723 _c1_compile_queue->free_all();
1724 }
1725
1726 if (_c2_compile_queue != NULL) {
1727 _c2_compile_queue->free_all();
1728 }
1729
1730 // Set flags so that we continue execution with using interpreter only.
1731 UseCompiler = false;
1732 UseInterpreter = true;
1733
1734 // We could delete compiler runtimes also. However, there are references to
1735 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1736 // fail. This can be done later if necessary.
1737 }
1738 }
1739
1740 // ------------------------------------------------------------------
1741 // CompileBroker::compiler_thread_loop
1742 //
1743 // The main loop run by a CompilerThread.
1744 void CompileBroker::compiler_thread_loop() {
1745 CompilerThread* thread = CompilerThread::current();
1746 CompileQueue* queue = thread->queue();
1747 // For the thread that initializes the ciObjectFactory
1748 // this resource mark holds all the shared objects
1749 ResourceMark rm;
1750
1751 // First thread to get here will initialize the compiler interface
1752
1753 if (!ciObjectFactory::is_initialized()) {
1754 ASSERT_IN_VM;
1755 MutexLocker only_one (CompileThread_lock, thread);
1756 if (!ciObjectFactory::is_initialized()) {
1757 ciObjectFactory::initialize();
1758 }
1759 }
1760
1761 // Open a log.
1762 if (LogCompilation) {
1763 init_compiler_thread_log();
1764 }
1765 CompileLog* log = thread->log();
1766 if (log != NULL) {
1767 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1768 thread->name(),
1769 os::current_thread_id(),
1770 os::current_process_id());
1771 log->stamp();
1772 log->end_elem();
1773 }
1774
1775 // If compiler thread/runtime initialization fails, exit the compiler thread
1776 if (!init_compiler_runtime()) {
1777 return;
1778 }
1779
1780 // Poll for new compilation tasks as long as the JVM runs. Compilation
1781 // should only be disabled if something went wrong while initializing the
1782 // compiler runtimes. This, in turn, should not happen. The only known case
1783 // when compiler runtime initialization fails is if there is not enough free
1784 // space in the code cache to generate the necessary stubs, etc.
1785 while (!is_compilation_disabled_forever()) {
1786 // We need this HandleMark to avoid leaking VM handles.
1787 HandleMark hm(thread);
1788
1789 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1790 // the code cache is really full
1791 handle_full_code_cache();
1792 }
1793
1794 CompileTask* task = queue->get();
1795 if (task == NULL) {
1796 continue;
1797 }
1798
1799 // Give compiler threads an extra quanta. They tend to be bursty and
1800 // this helps the compiler to finish up the job.
1801 if( CompilerThreadHintNoPreempt )
1802 os::hint_no_preempt();
1803
1804 // trace per thread time and compile statistics
1805 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1806 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1807
1808 // Assign the task to the current thread. Mark this compilation
1809 // thread as active for the profiler.
1810 CompileTaskWrapper ctw(task);
1811 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1812 task->set_code_handle(&result_handle);
1813 methodHandle method(thread, task->method());
1814
1815 // Never compile a method if breakpoints are present in it
1816 if (method()->number_of_breakpoints() == 0) {
1817 // Compile the method.
1818 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1819 invoke_compiler_on_method(task);
1820 } else {
1821 // After compilation is disabled, remove remaining methods from queue
1822 method->clear_queued_for_compilation();
1823 task->set_failure_reason("compilation is disabled");
1824 }
1825 }
1826 }
1827
1828 // Shut down compiler runtime
1829 shutdown_compiler_runtime(thread->compiler(), thread);
1830 }
1831
1832 // ------------------------------------------------------------------
1833 // CompileBroker::init_compiler_thread_log
1834 //
1835 // Set up state required by +LogCompilation.
1836 void CompileBroker::init_compiler_thread_log() {
1837 CompilerThread* thread = CompilerThread::current();
1838 char file_name[4*K];
1839 FILE* fp = NULL;
1840 intx thread_id = os::current_thread_id();
1841 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1842 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1843 if (dir == NULL) {
1844 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1845 thread_id, os::current_process_id());
1846 } else {
1847 jio_snprintf(file_name, sizeof(file_name),
1848 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1849 os::file_separator(), thread_id, os::current_process_id());
1850 }
1851
1852 fp = fopen(file_name, "wt");
1853 if (fp != NULL) {
1854 if (LogCompilation && Verbose) {
1855 tty->print_cr("Opening compilation log %s", file_name);
1856 }
1857 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1858 if (log == NULL) {
1859 fclose(fp);
1860 return;
1861 }
1862 thread->init_log(log);
1863
1864 if (xtty != NULL) {
1865 ttyLocker ttyl;
1866 // Record any per thread log files
1867 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1868 }
1869 return;
1870 }
1871 }
1872 warning("Cannot open log file: %s", file_name);
1873 }
1874
1875 // ------------------------------------------------------------------
1876 // CompileBroker::set_should_block
1877 //
1878 // Set _should_block.
1879 // Call this from the VM, with Threads_lock held and a safepoint requested.
1880 void CompileBroker::set_should_block() {
1881 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1882 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1883 #ifndef PRODUCT
1884 if (PrintCompilation && (Verbose || WizardMode))
1885 tty->print_cr("notifying compiler thread pool to block");
1886 #endif
1887 _should_block = true;
1888 }
1889
1890 // ------------------------------------------------------------------
1891 // CompileBroker::maybe_block
1892 //
1893 // Call this from the compiler at convenient points, to poll for _should_block.
1894 void CompileBroker::maybe_block() {
1895 if (_should_block) {
1896 #ifndef PRODUCT
1897 if (PrintCompilation && (Verbose || WizardMode))
1898 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1899 #endif
1900 ThreadInVMfromNative tivfn(JavaThread::current());
1901 }
1902 }
1903
1904 // wrapper for CodeCache::print_summary()
1905 static void codecache_print(bool detailed)
1906 {
1907 ResourceMark rm;
1908 stringStream s;
1909 // Dump code cache into a buffer before locking the tty,
1910 {
1911 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1912 CodeCache::print_summary(&s, detailed);
1913 }
1914 ttyLocker ttyl;
1915 tty->print("%s", s.as_string());
1916 }
1917
1918 #if INCLUDE_JFR
1919 static void post_compilation_event(EventCompilation* event, CompileTask* task) {
1920 assert(event != NULL, "invariant");
1921 assert(event->should_commit(), "invariant");
1922 event->set_method(task->method());
1923 event->set_compileId(task->compile_id());
1924 event->set_compileLevel(task->comp_level());
1925 event->set_succeded(task->is_success());
1926 event->set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
1927 event->set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1928 event->set_inlinedBytes(task->num_inlined_bytecodes());
1929 event->commit();
1930 }
1931 #endif
1932
1933 // ------------------------------------------------------------------
1934 // CompileBroker::invoke_compiler_on_method
1935 //
1936 // Compile a method.
1937 //
1938 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1939 if (PrintCompilation) {
1940 ResourceMark rm;
1941 task->print_line();
1942 }
1943 elapsedTimer time;
1944
1945 CompilerThread* thread = CompilerThread::current();
1946 ResourceMark rm(thread);
1947
1948 if (LogEvents) {
1949 _compilation_log->log_compile(thread, task);
1950 }
1951
1952 // Common flags.
1953 uint compile_id = task->compile_id();
1954 int osr_bci = task->osr_bci();
1955 bool is_osr = (osr_bci != standard_entry_bci);
1956 bool should_log = (thread->log() != NULL);
1957 bool should_break = false;
1958 int task_level = task->comp_level();
1959 {
1960 // create the handle inside it's own block so it can't
1961 // accidentally be referenced once the thread transitions to
1962 // native. The NoHandleMark before the transition should catch
1963 // any cases where this occurs in the future.
1964 methodHandle method(thread, task->method());
1965 should_break = check_break_at(method, compile_id, is_osr);
1966 if (should_log && !CompilerOracle::should_log(method)) {
1967 should_log = false;
1968 }
1969 assert(!method->is_native(), "no longer compile natives");
1970
1971 // Save information about this method in case of failure.
1972 set_last_compile(thread, method, is_osr, task_level);
1973
1974 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1975 }
1976
1977 // Allocate a new set of JNI handles.
1978 push_jni_handle_block();
1979 Method* target_handle = task->method();
1980 int compilable = ciEnv::MethodCompilable;
1981 {
1982 int system_dictionary_modification_counter;
1983 {
1984 MutexLocker locker(Compile_lock, thread);
1985 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1986 }
1987
1988 NoHandleMark nhm;
1989 ThreadToNativeFromVM ttn(thread);
1990
1991 ciEnv ci_env(task, system_dictionary_modification_counter);
1992 if (should_break) {
1993 ci_env.set_break_at_compile(true);
1994 }
1995 if (should_log) {
1996 ci_env.set_log(thread->log());
1997 }
1998 assert(thread->env() == &ci_env, "set by ci_env");
1999 // The thread-env() field is cleared in ~CompileTaskWrapper.
2000
2001 // Cache Jvmti state
2002 ci_env.cache_jvmti_state();
2003
2004 // Cache DTrace flags
2005 ci_env.cache_dtrace_flags();
2006
2007 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2008
2009 TraceTime t1("compilation", &time);
2010 #if INCLUDE_JFR
2011 EventCompilation event;
2012 #endif
2013
2014 AbstractCompiler *comp = compiler(task_level);
2015 if (comp == NULL) {
2016 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2017 } else {
2018 comp->compile_method(&ci_env, target, osr_bci);
2019 }
2020
2021 if (!ci_env.failing() && task->code() == NULL) {
2022 //assert(false, "compiler should always document failure");
2023 // The compiler elected, without comment, not to register a result.
2024 // Do not attempt further compilations of this method.
2025 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2026 }
2027
2028 // Copy this bit to the enclosing block:
2029 compilable = ci_env.compilable();
2030
2031 if (ci_env.failing()) {
2032 const char *failure_reason = ci_env.failure_reason();
2033 const char* retry_message = ci_env.retry_message();
2034 task->set_failure_reason(failure_reason);
2035 if (_compilation_log != NULL) {
2036 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2037 }
2038 if (PrintCompilation) {
2039 FormatBufferResource msg = retry_message != NULL ?
2040 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2041 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2042 task->print_compilation(tty, msg);
2043 }
2044
2045 #if INCLUDE_JFR
2046 EventCompilationFailure event;
2047 if (event.should_commit()) {
2048 event.set_compileId(compile_id);
2049 event.set_failureMessage(failure_reason);
2050 event.commit();
2051 }
2052 #endif
2053 } else {
2054 task->mark_success();
2055 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2056 if (_compilation_log != NULL) {
2057 nmethod* code = task->code();
2058 if (code != NULL) {
2059 _compilation_log->log_nmethod(thread, code);
2060 }
2061 }
2062 }
2063 // simulate crash during compilation
2064 assert(task->compile_id() != CICrashAt, "just as planned");
2065 #if INCLUDE_JFR
2066 if (event.should_commit()) {
2067 post_compilation_event(&event, task);
2068 }
2069 #endif
2070 }
2071 pop_jni_handle_block();
2072
2073 methodHandle method(thread, task->method());
2074
2075 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2076
2077 collect_statistics(thread, time, task);
2078
2079 if (PrintCompilation && PrintCompilation2) {
2080 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2081 tty->print("%4d ", compile_id); // print compilation number
2082 tty->print("%s ", (is_osr ? "%" : " "));
2083 if (task->code() != NULL) {
2084 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2085 }
2086 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2087 }
2088
2089 if (PrintCodeCacheOnCompilation)
2090 codecache_print(/* detailed= */ false);
2091
2092 // Disable compilation, if required.
2093 switch (compilable) {
2094 case ciEnv::MethodCompilable_never:
2095 if (is_osr)
2096 method->set_not_osr_compilable_quietly();
2097 else
2098 method->set_not_compilable_quietly();
2099 break;
2100 case ciEnv::MethodCompilable_not_at_tier:
2101 if (is_osr)
2102 method->set_not_osr_compilable_quietly(task_level);
2103 else
2104 method->set_not_compilable_quietly(task_level);
2105 break;
2106 }
2107
2108 // Note that the queued_for_compilation bits are cleared without
2109 // protection of a mutex. [They were set by the requester thread,
2110 // when adding the task to the compile queue -- at which time the
2111 // compile queue lock was held. Subsequently, we acquired the compile
2112 // queue lock to get this task off the compile queue; thus (to belabour
2113 // the point somewhat) our clearing of the bits must be occurring
2114 // only after the setting of the bits. See also 14012000 above.
2115 method->clear_queued_for_compilation();
2116
2117 #ifdef ASSERT
2118 if (CollectedHeap::fired_fake_oom()) {
2119 // The current compile received a fake OOM during compilation so
2120 // go ahead and exit the VM since the test apparently succeeded
2121 tty->print_cr("*** Shutting down VM after successful fake OOM");
2122 vm_exit(0);
2123 }
2124 #endif
2125 }
2126
2127 /**
2128 * The CodeCache is full. Print out warning and disable compilation
2129 * or try code cache cleaning so compilation can continue later.
2130 */
2131 void CompileBroker::handle_full_code_cache() {
2132 UseInterpreter = true;
2133 if (UseCompiler || AlwaysCompileLoopMethods ) {
2134 if (xtty != NULL) {
2135 ResourceMark rm;
2136 stringStream s;
2137 // Dump code cache state into a buffer before locking the tty,
2138 // because log_state() will use locks causing lock conflicts.
2139 CodeCache::log_state(&s);
2140 // Lock to prevent tearing
2141 ttyLocker ttyl;
2142 xtty->begin_elem("code_cache_full");
2143 xtty->print("%s", s.as_string());
2144 xtty->stamp();
2145 xtty->end_elem();
2146 }
2147
2148 CodeCache::report_codemem_full();
2149
2150 #ifndef PRODUCT
2151 if (CompileTheWorld || ExitOnFullCodeCache) {
2152 codecache_print(/* detailed= */ true);
2153 before_exit(JavaThread::current());
2154 exit_globals(); // will delete tty
2155 vm_direct_exit(CompileTheWorld ? 0 : 1);
2156 }
2157 #endif
2158 if (UseCodeCacheFlushing) {
2159 // Since code cache is full, immediately stop new compiles
2160 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2161 NMethodSweeper::log_sweep("disable_compiler");
2162 }
2163 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2164 // without having to consider the state in which the current thread is.
2165 ThreadInVMfromUnknown in_vm;
2166 NMethodSweeper::possibly_sweep();
2167 } else {
2168 disable_compilation_forever();
2169 }
2170
2171 // Print warning only once
2172 if (should_print_compiler_warning()) {
2173 warning("CodeCache is full. Compiler has been disabled.");
2174 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2175 codecache_print(/* detailed= */ true);
2176 }
2177 }
2178 }
2179
2180 // ------------------------------------------------------------------
2181 // CompileBroker::set_last_compile
2182 //
2183 // Record this compilation for debugging purposes.
2184 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2185 ResourceMark rm;
2186 char* method_name = method->name()->as_C_string();
2187 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2188 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2189 char current_method[CompilerCounters::cmname_buffer_length];
2190 size_t maxLen = CompilerCounters::cmname_buffer_length;
2191
2192 if (UsePerfData) {
2193 const char* class_name = method->method_holder()->name()->as_C_string();
2194
2195 size_t s1len = strlen(class_name);
2196 size_t s2len = strlen(method_name);
2197
2198 // check if we need to truncate the string
2199 if (s1len + s2len + 2 > maxLen) {
2200
2201 // the strategy is to lop off the leading characters of the
2202 // class name and the trailing characters of the method name.
2203
2204 if (s2len + 2 > maxLen) {
2205 // lop of the entire class name string, let snprintf handle
2206 // truncation of the method name.
2207 class_name += s1len; // null string
2208 }
2209 else {
2210 // lop off the extra characters from the front of the class name
2211 class_name += ((s1len + s2len + 2) - maxLen);
2212 }
2213 }
2214
2215 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2216 }
2217
2218 if (CICountOSR && is_osr) {
2219 _last_compile_type = osr_compile;
2220 } else {
2221 _last_compile_type = normal_compile;
2222 }
2223 _last_compile_level = comp_level;
2224
2225 if (UsePerfData) {
2226 CompilerCounters* counters = thread->counters();
2227 counters->set_current_method(current_method);
2228 counters->set_compile_type((jlong)_last_compile_type);
2229 }
2230 }
2231
2232
2233 // ------------------------------------------------------------------
2234 // CompileBroker::push_jni_handle_block
2235 //
2236 // Push on a new block of JNI handles.
2237 void CompileBroker::push_jni_handle_block() {
2238 JavaThread* thread = JavaThread::current();
2239
2240 // Allocate a new block for JNI handles.
2241 // Inlined code from jni_PushLocalFrame()
2242 JNIHandleBlock* java_handles = thread->active_handles();
2243 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2244 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2245 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2246 thread->set_active_handles(compile_handles);
2247 }
2248
2249
2250 // ------------------------------------------------------------------
2251 // CompileBroker::pop_jni_handle_block
2252 //
2253 // Pop off the current block of JNI handles.
2254 void CompileBroker::pop_jni_handle_block() {
2255 JavaThread* thread = JavaThread::current();
2256
2257 // Release our JNI handle block
2258 JNIHandleBlock* compile_handles = thread->active_handles();
2259 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2260 thread->set_active_handles(java_handles);
2261 compile_handles->set_pop_frame_link(NULL);
2262 JNIHandleBlock::release_block(compile_handles, thread); // may block
2263 }
2264
2265
2266 // ------------------------------------------------------------------
2267 // CompileBroker::check_break_at
2268 //
2269 // Should the compilation break at the current compilation.
2270 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2271 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2272 return true;
2273 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2274 return true;
2275 } else {
2276 return (compile_id == CIBreakAt);
2277 }
2278 }
2279
2280 // ------------------------------------------------------------------
2281 // CompileBroker::collect_statistics
2282 //
2283 // Collect statistics about the compilation.
2284
2285 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2286 bool success = task->is_success();
2287 methodHandle method (thread, task->method());
2288 uint compile_id = task->compile_id();
2289 bool is_osr = (task->osr_bci() != standard_entry_bci);
2290 nmethod* code = task->code();
2291 CompilerCounters* counters = thread->counters();
2292
2293 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2294 MutexLocker locker(CompileStatistics_lock);
2295
2296 // _perf variables are production performance counters which are
2297 // updated regardless of the setting of the CITime and CITimeEach flags
2298 //
2299 if (!success) {
2300 _total_bailout_count++;
2301 if (UsePerfData) {
2302 _perf_last_failed_method->set_value(counters->current_method());
2303 _perf_last_failed_type->set_value(counters->compile_type());
2304 _perf_total_bailout_count->inc();
2305 }
2306 } else if (code == NULL) {
2307 if (UsePerfData) {
2308 _perf_last_invalidated_method->set_value(counters->current_method());
2309 _perf_last_invalidated_type->set_value(counters->compile_type());
2310 _perf_total_invalidated_count->inc();
2311 }
2312 _total_invalidated_count++;
2313 } else {
2314 // Compilation succeeded
2315
2316 // update compilation ticks - used by the implementation of
2317 // java.lang.management.CompilationMBean
2318 _perf_total_compilation->inc(time.ticks());
2319
2320 _t_total_compilation.add(time);
2321 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2322
2323 if (CITime) {
2324 if (is_osr) {
2325 _t_osr_compilation.add(time);
2326 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2327 } else {
2328 _t_standard_compilation.add(time);
2329 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2330 }
2331 }
2332
2333 if (UsePerfData) {
2334 // save the name of the last method compiled
2335 _perf_last_method->set_value(counters->current_method());
2336 _perf_last_compile_type->set_value(counters->compile_type());
2337 _perf_last_compile_size->set_value(method->code_size() +
2338 task->num_inlined_bytecodes());
2339 if (is_osr) {
2340 _perf_osr_compilation->inc(time.ticks());
2341 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2342 } else {
2343 _perf_standard_compilation->inc(time.ticks());
2344 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2345 }
2346 }
2347
2348 if (CITimeEach) {
2349 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2350 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2351 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2352 }
2353
2354 // Collect counts of successful compilations
2355 _sum_nmethod_size += code->total_size();
2356 _sum_nmethod_code_size += code->insts_size();
2357 _total_compile_count++;
2358
2359 if (UsePerfData) {
2360 _perf_sum_nmethod_size->inc( code->total_size());
2361 _perf_sum_nmethod_code_size->inc(code->insts_size());
2362 _perf_total_compile_count->inc();
2363 }
2364
2365 if (is_osr) {
2366 if (UsePerfData) _perf_total_osr_compile_count->inc();
2367 _total_osr_compile_count++;
2368 } else {
2369 if (UsePerfData) _perf_total_standard_compile_count->inc();
2370 _total_standard_compile_count++;
2371 }
2372 }
2373 // set the current method for the thread to null
2374 if (UsePerfData) counters->set_current_method("");
2375 }
2376
2377 const char* CompileBroker::compiler_name(int comp_level) {
2378 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2379 if (comp == NULL) {
2380 return "no compiler";
2381 } else {
2382 return (comp->name());
2383 }
2384 }
2385
2386 void CompileBroker::print_times() {
2387 tty->cr();
2388 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2389 tty->print_cr("------------------------------------------------");
2390 //0000000000111111111122222222223333333333444444444455555555556666666666
2391 //0123456789012345678901234567890123456789012345678901234567890123456789
2392 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2393 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2394 CompileBroker::_t_standard_compilation.seconds(),
2395 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2396 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);
2397
2398 AbstractCompiler *comp = compiler(CompLevel_simple);
2399 if (comp != NULL) {
2400 comp->print_timers();
2401 }
2402 comp = compiler(CompLevel_full_optimization);
2403 if (comp != NULL) {
2404 comp->print_timers();
2405 }
2406 tty->cr();
2407 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2408 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2409 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2410 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2411 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2412 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2413 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2414 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2415 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2416 tty->cr();
2417 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2418 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2419 }
2420
2421 // Debugging output for failure
2422 void CompileBroker::print_last_compile() {
2423 if ( _last_compile_level != CompLevel_none &&
2424 compiler(_last_compile_level) != NULL &&
2425 _last_method_compiled != NULL &&
2426 _last_compile_type != no_compile) {
2427 if (_last_compile_type == osr_compile) {
2428 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2429 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2430 } else {
2431 tty->print_cr("Last parse: %d+++(%d) %s",
2432 _compilation_id, _last_compile_level, _last_method_compiled);
2433 }
2434 }
2435 }
2436
2437
2438 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2439 #ifndef PRODUCT
2440 st->print_cr("Compiler thread printing unimplemented.");
2441 st->cr();
2442 #endif
2443 }