1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodData.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/interfaceSupport.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "trace/tracing.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #include "utilities/macros.hpp"
50 #ifdef COMPILER1
51 #include "c1/c1_Compiler.hpp"
52 #endif
53 #ifdef COMPILER2
54 #include "opto/c2compiler.hpp"
55 #endif
56 #ifdef SHARK
57 #include "shark/sharkCompiler.hpp"
58 #endif
59
60 #ifdef DTRACE_ENABLED
61
62 // Only bother with this argument setup if dtrace is available
63
64 #ifndef USDT2
65 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
66 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
67 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
68 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
69
70 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
71 { \
72 Symbol* klass_name = (method)->klass_name(); \
73 Symbol* name = (method)->name(); \
74 Symbol* signature = (method)->signature(); \
75 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
76 comp_name, strlen(comp_name), \
77 klass_name->bytes(), klass_name->utf8_length(), \
78 name->bytes(), name->utf8_length(), \
79 signature->bytes(), signature->utf8_length()); \
80 }
81
82 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
83 { \
84 Symbol* klass_name = (method)->klass_name(); \
85 Symbol* name = (method)->name(); \
86 Symbol* signature = (method)->signature(); \
87 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
88 comp_name, strlen(comp_name), \
89 klass_name->bytes(), klass_name->utf8_length(), \
90 name->bytes(), name->utf8_length(), \
91 signature->bytes(), signature->utf8_length(), (success)); \
92 }
93
94 #else /* USDT2 */
95
96 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
97 { \
98 Symbol* klass_name = (method)->klass_name(); \
99 Symbol* name = (method)->name(); \
100 Symbol* signature = (method)->signature(); \
101 HOTSPOT_METHOD_COMPILE_BEGIN( \
102 comp_name, strlen(comp_name), \
103 (char *) klass_name->bytes(), klass_name->utf8_length(), \
104 (char *) name->bytes(), name->utf8_length(), \
105 (char *) signature->bytes(), signature->utf8_length()); \
106 }
107
108 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
109 { \
110 Symbol* klass_name = (method)->klass_name(); \
111 Symbol* name = (method)->name(); \
112 Symbol* signature = (method)->signature(); \
113 HOTSPOT_METHOD_COMPILE_END( \
114 comp_name, strlen(comp_name), \
115 (char *) klass_name->bytes(), klass_name->utf8_length(), \
116 (char *) name->bytes(), name->utf8_length(), \
117 (char *) signature->bytes(), signature->utf8_length(), (success)); \
118 }
119 #endif /* USDT2 */
120
121 #else // ndef DTRACE_ENABLED
122
123 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
124 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
125
126 #endif // ndef DTRACE_ENABLED
127
128 bool CompileBroker::_initialized = false;
129 volatile bool CompileBroker::_should_block = false;
130 volatile jint CompileBroker::_print_compilation_warning = 0;
131 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
132
133 // The installed compiler(s)
134 AbstractCompiler* CompileBroker::_compilers[2];
135
136 // These counters are used to assign an unique ID to each compilation.
137 volatile jint CompileBroker::_compilation_id = 0;
138 volatile jint CompileBroker::_osr_compilation_id = 0;
139
140 // Debugging information
141 int CompileBroker::_last_compile_type = no_compile;
142 int CompileBroker::_last_compile_level = CompLevel_none;
143 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
144
145 // Performance counters
146 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
148 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
149
150 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
154 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
155
156 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
160
161 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
163 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
165 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
166 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
167 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
168
169 // Timers and counters for generating statistics
170 elapsedTimer CompileBroker::_t_total_compilation;
171 elapsedTimer CompileBroker::_t_osr_compilation;
172 elapsedTimer CompileBroker::_t_standard_compilation;
173
174 int CompileBroker::_total_bailout_count = 0;
175 int CompileBroker::_total_invalidated_count = 0;
176 int CompileBroker::_total_compile_count = 0;
177 int CompileBroker::_total_osr_compile_count = 0;
178 int CompileBroker::_total_standard_compile_count = 0;
179
180 int CompileBroker::_sum_osr_bytes_compiled = 0;
181 int CompileBroker::_sum_standard_bytes_compiled = 0;
182 int CompileBroker::_sum_nmethod_size = 0;
183 int CompileBroker::_sum_nmethod_code_size = 0;
184
185 long CompileBroker::_peak_compilation_time = 0;
186
187 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
188 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
189
190 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
191
192
193 class CompilationLog : public StringEventLog {
194 public:
195 CompilationLog() : StringEventLog("Compilation events") {
196 }
197
198 void log_compile(JavaThread* thread, CompileTask* task) {
199 StringLogMessage lm;
200 stringStream sstr = lm.stream();
201 // msg.time_stamp().update_to(tty->time_stamp().ticks());
202 task->print_compilation(&sstr, NULL, true);
203 log(thread, "%s", (const char*)lm);
204 }
205
206 void log_nmethod(JavaThread* thread, nmethod* nm) {
207 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
208 nm->compile_id(), nm->is_osr_method() ? "%" : "",
209 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
210 }
211
212 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
213 StringLogMessage lm;
214 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
215 if (retry_message != NULL) {
216 lm.append(" (%s)", retry_message);
217 }
218 lm.print("\n");
219 log(thread, "%s", (const char*)lm);
220 }
221 };
222
223 static CompilationLog* _compilation_log = NULL;
224
225 void compileBroker_init() {
226 if (LogEvents) {
227 _compilation_log = new CompilationLog();
228 }
229 }
230
231 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
232 CompilerThread* thread = CompilerThread::current();
233 thread->set_task(task);
234 CompileLog* log = thread->log();
235 if (log != NULL) task->log_task_start(log);
236 }
237
238 CompileTaskWrapper::~CompileTaskWrapper() {
239 CompilerThread* thread = CompilerThread::current();
240 CompileTask* task = thread->task();
241 CompileLog* log = thread->log();
242 if (log != NULL) task->log_task_done(log);
243 thread->set_task(NULL);
244 task->set_code_handle(NULL);
245 thread->set_env(NULL);
246 if (task->is_blocking()) {
247 MutexLocker notifier(task->lock(), thread);
248 task->mark_complete();
249 // Notify the waiting thread that the compilation has completed.
250 task->lock()->notify_all();
251 } else {
252 task->mark_complete();
253
254 // By convention, the compiling thread is responsible for
255 // recycling a non-blocking CompileTask.
256 CompileTask::free(task);
257 }
258 }
259
260
261 CompileTask* CompileTask::_task_free_list = NULL;
262 #ifdef ASSERT
263 int CompileTask::_num_allocated_tasks = 0;
264 #endif
265 /**
266 * Allocate a CompileTask, from the free list if possible.
267 */
268 CompileTask* CompileTask::allocate() {
269 MutexLocker locker(CompileTaskAlloc_lock);
270 CompileTask* task = NULL;
271
272 if (_task_free_list != NULL) {
273 task = _task_free_list;
274 _task_free_list = task->next();
275 task->set_next(NULL);
276 } else {
277 task = new CompileTask();
278 DEBUG_ONLY(_num_allocated_tasks++;)
279 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
280 task->set_next(NULL);
281 task->set_is_free(true);
282 }
283 assert(task->is_free(), "Task must be free.");
284 task->set_is_free(false);
285 return task;
286 }
287
288
289 /**
290 * Add a task to the free list.
291 */
292 void CompileTask::free(CompileTask* task) {
293 MutexLocker locker(CompileTaskAlloc_lock);
294 if (!task->is_free()) {
295 task->set_code(NULL);
296 assert(!task->lock()->is_locked(), "Should not be locked when freed");
297 JNIHandles::destroy_global(task->_method_holder);
298 JNIHandles::destroy_global(task->_hot_method_holder);
299
300 task->set_is_free(true);
301 task->set_next(_task_free_list);
302 _task_free_list = task;
303 }
304 }
305
306 void CompileTask::initialize(int compile_id,
307 methodHandle method,
308 int osr_bci,
309 int comp_level,
310 methodHandle hot_method,
311 int hot_count,
312 const char* comment,
313 bool is_blocking) {
314 assert(!_lock->is_locked(), "bad locking");
315
316 _compile_id = compile_id;
317 _method = method();
318 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
319 _osr_bci = osr_bci;
320 _is_blocking = is_blocking;
321 _comp_level = comp_level;
322 _num_inlined_bytecodes = 0;
323
324 _is_complete = false;
325 _is_success = false;
326 _code_handle = NULL;
327
328 _hot_method = NULL;
329 _hot_method_holder = NULL;
330 _hot_count = hot_count;
331 _time_queued = 0; // tidy
332 _comment = comment;
333 _failure_reason = NULL;
334
335 if (LogCompilation) {
336 _time_queued = os::elapsed_counter();
337 if (hot_method.not_null()) {
338 if (hot_method == method) {
339 _hot_method = _method;
340 } else {
341 _hot_method = hot_method();
342 // only add loader or mirror if different from _method_holder
343 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
344 }
345 }
346 }
347
348 _next = NULL;
349 }
350
351 // ------------------------------------------------------------------
352 // CompileTask::code/set_code
353 nmethod* CompileTask::code() const {
354 if (_code_handle == NULL) return NULL;
355 return _code_handle->code();
356 }
357 void CompileTask::set_code(nmethod* nm) {
358 if (_code_handle == NULL && nm == NULL) return;
359 guarantee(_code_handle != NULL, "");
360 _code_handle->set_code(nm);
361 if (nm == NULL) _code_handle = NULL; // drop the handle also
362 }
363
364
365 void CompileTask::mark_on_stack() {
366 // Mark these methods as something redefine classes cannot remove.
367 _method->set_on_stack(true);
368 if (_hot_method != NULL) {
369 _hot_method->set_on_stack(true);
370 }
371 }
372
373 // ------------------------------------------------------------------
374 // CompileTask::print
375 void CompileTask::print() {
376 tty->print("<CompileTask compile_id=%d ", _compile_id);
377 tty->print("method=");
378 _method->print_name(tty);
379 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
380 _osr_bci, bool_to_str(_is_blocking),
381 bool_to_str(_is_complete), bool_to_str(_is_success));
382 }
383
384
385 // ------------------------------------------------------------------
386 // CompileTask::print_line_on_error
387 //
388 // This function is called by fatal error handler when the thread
389 // causing troubles is a compiler thread.
390 //
391 // Do not grab any lock, do not allocate memory.
392 //
393 // Otherwise it's the same as CompileTask::print_line()
394 //
395 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
396 // print compiler name
397 st->print("%s:", CompileBroker::compiler_name(comp_level()));
398 print_compilation(st);
399 }
400
401 // ------------------------------------------------------------------
402 // CompileTask::print_line
403 void CompileTask::print_line() {
404 ttyLocker ttyl; // keep the following output all in one block
405 // print compiler name if requested
406 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
407 print_compilation();
408 }
409
410
411 // ------------------------------------------------------------------
412 // CompileTask::print_compilation_impl
413 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
414 bool is_osr_method, int osr_bci, bool is_blocking,
415 const char* msg, bool short_form) {
416 if (!short_form) {
417 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
418 }
419 st->print("%4d ", compile_id); // print compilation number
420
421 // For unloaded methods the transition to zombie occurs after the
422 // method is cleared so it's impossible to report accurate
423 // information for that case.
424 bool is_synchronized = false;
425 bool has_exception_handler = false;
426 bool is_native = false;
427 if (method != NULL) {
428 is_synchronized = method->is_synchronized();
429 has_exception_handler = method->has_exception_handler();
430 is_native = method->is_native();
431 }
432 // method attributes
433 const char compile_type = is_osr_method ? '%' : ' ';
434 const char sync_char = is_synchronized ? 's' : ' ';
435 const char exception_char = has_exception_handler ? '!' : ' ';
436 const char blocking_char = is_blocking ? 'b' : ' ';
437 const char native_char = is_native ? 'n' : ' ';
438
439 // print method attributes
440 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
441
442 if (TieredCompilation) {
443 if (comp_level != -1) st->print("%d ", comp_level);
444 else st->print("- ");
445 }
446 st->print(" "); // more indent
447
448 if (method == NULL) {
449 st->print("(method)");
450 } else {
451 method->print_short_name(st);
452 if (is_osr_method) {
453 st->print(" @ %d", osr_bci);
454 }
455 if (method->is_native())
456 st->print(" (native)");
457 else
458 st->print(" (%d bytes)", method->code_size());
459 }
460
461 if (msg != NULL) {
462 st->print(" %s", msg);
463 }
464 if (!short_form) {
465 st->cr();
466 }
467 }
468
469 // ------------------------------------------------------------------
470 // CompileTask::print_inlining
471 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
472 // 1234567
473 st->print(" "); // print timestamp
474 // 1234
475 st->print(" "); // print compilation number
476
477 // method attributes
478 if (method->is_loaded()) {
479 const char sync_char = method->is_synchronized() ? 's' : ' ';
480 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
481 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
482
483 // print method attributes
484 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
485 } else {
486 // %s!bn
487 st->print(" "); // print method attributes
488 }
489
490 if (TieredCompilation) {
491 st->print(" ");
492 }
493 st->print(" "); // more indent
494 st->print(" "); // initial inlining indent
495
496 for (int i = 0; i < inline_level; i++) st->print(" ");
497
498 st->print("@ %d ", bci); // print bci
499 method->print_short_name(st);
500 if (method->is_loaded())
501 st->print(" (%d bytes)", method->code_size());
502 else
503 st->print(" (not loaded)");
504
505 if (msg != NULL) {
506 st->print(" %s", msg);
507 }
508 st->cr();
509 }
510
511 // ------------------------------------------------------------------
512 // CompileTask::print_inline_indent
513 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
514 // 1234567
515 st->print(" "); // print timestamp
516 // 1234
517 st->print(" "); // print compilation number
518 // %s!bn
519 st->print(" "); // print method attributes
520 if (TieredCompilation) {
521 st->print(" ");
522 }
523 st->print(" "); // more indent
524 st->print(" "); // initial inlining indent
525 for (int i = 0; i < inline_level; i++) st->print(" ");
526 }
527
528 // ------------------------------------------------------------------
529 // CompileTask::print_compilation
530 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
531 bool is_osr_method = osr_bci() != InvocationEntryBci;
532 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
533 }
534
535 // ------------------------------------------------------------------
536 // CompileTask::log_task
537 void CompileTask::log_task(xmlStream* log) {
538 Thread* thread = Thread::current();
539 methodHandle method(thread, this->method());
540 ResourceMark rm(thread);
541
542 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
543 log->print(" compile_id='%d'", _compile_id);
544 if (_osr_bci != CompileBroker::standard_entry_bci) {
545 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
546 } // else compile_kind='c2c'
547 if (!method.is_null()) log->method(method);
548 if (_osr_bci != CompileBroker::standard_entry_bci) {
549 log->print(" osr_bci='%d'", _osr_bci);
550 }
551 if (_comp_level != CompLevel_highest_tier) {
552 log->print(" level='%d'", _comp_level);
553 }
554 if (_is_blocking) {
555 log->print(" blocking='1'");
556 }
557 log->stamp();
558 }
559
560
561 // ------------------------------------------------------------------
562 // CompileTask::log_task_queued
563 void CompileTask::log_task_queued() {
564 Thread* thread = Thread::current();
565 ttyLocker ttyl;
566 ResourceMark rm(thread);
567
568 xtty->begin_elem("task_queued");
569 log_task(xtty);
570 if (_comment != NULL) {
571 xtty->print(" comment='%s'", _comment);
572 }
573 if (_hot_method != NULL) {
574 methodHandle hot(thread, _hot_method);
575 methodHandle method(thread, _method);
576 if (hot() != method()) {
577 xtty->method(hot);
578 }
579 }
580 if (_hot_count != 0) {
581 xtty->print(" hot_count='%d'", _hot_count);
582 }
583 xtty->end_elem();
584 }
585
586
587 // ------------------------------------------------------------------
588 // CompileTask::log_task_start
589 void CompileTask::log_task_start(CompileLog* log) {
590 log->begin_head("task");
591 log_task(log);
592 log->end_head();
593 }
594
595
596 // ------------------------------------------------------------------
597 // CompileTask::log_task_done
598 void CompileTask::log_task_done(CompileLog* log) {
599 Thread* thread = Thread::current();
600 methodHandle method(thread, this->method());
601 ResourceMark rm(thread);
602
603 if (!_is_success) {
604 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
605 log->elem("failure reason='%s'", reason);
606 }
607
608 // <task_done ... stamp='1.234'> </task>
609 nmethod* nm = code();
610 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
611 _is_success, nm == NULL ? 0 : nm->content_size(),
612 method->invocation_count());
613 int bec = method->backedge_count();
614 if (bec != 0) log->print(" backedge_count='%d'", bec);
615 // Note: "_is_complete" is about to be set, but is not.
616 if (_num_inlined_bytecodes != 0) {
617 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
618 }
619 log->stamp();
620 log->end_elem();
621 log->tail("task");
622 log->clear_identities(); // next task will have different CI
623 if (log->unflushed_count() > 2000) {
624 log->flush();
625 }
626 log->mark_file_end();
627 }
628
629
630
631 /**
632 * Add a CompileTask to a CompileQueue
633 */
634 void CompileQueue::add(CompileTask* task) {
635 assert(lock()->owned_by_self(), "must own lock");
636 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
637
638 task->set_next(NULL);
639 task->set_prev(NULL);
640
641 if (_last == NULL) {
642 // The compile queue is empty.
643 assert(_first == NULL, "queue is empty");
644 _first = task;
645 _last = task;
646 } else {
647 // Append the task to the queue.
648 assert(_last->next() == NULL, "not last");
649 _last->set_next(task);
650 task->set_prev(_last);
651 _last = task;
652 }
653 ++_size;
654
655 // Mark the method as being in the compile queue.
656 task->method()->set_queued_for_compilation();
657
658 NOT_PRODUCT(print();)
659
660 if (LogCompilation && xtty != NULL) {
661 task->log_task_queued();
662 }
663
664 // Notify CompilerThreads that a task is available.
665 lock()->notify_all();
666 }
667
668 /**
669 * Empties compilation queue by putting all compilation tasks onto
670 * a freelist. Furthermore, the method wakes up all threads that are
671 * waiting on a compilation task to finish. This can happen if background
672 * compilation is disabled.
673 */
674 void CompileQueue::free_all() {
675 MutexLocker mu(lock());
676 CompileTask* next = _first;
677
678 // Iterate over all tasks in the compile queue
679 while (next != NULL) {
680 CompileTask* current = next;
681 next = current->next();
682 {
683 // Wake up thread that blocks on the compile task.
684 MutexLocker ct_lock(current->lock());
685 current->lock()->notify();
686 }
687 // Put the task back on the freelist.
688 CompileTask::free(current);
689 }
690 _first = NULL;
691
692 // Wake up all threads that block on the queue.
693 lock()->notify_all();
694 }
695
696 // ------------------------------------------------------------------
697 // CompileQueue::get
698 //
699 // Get the next CompileTask from a CompileQueue
700 CompileTask* CompileQueue::get() {
701 NMethodSweeper::possibly_sweep();
702
703 MutexLocker locker(lock());
704 // If _first is NULL we have no more compile jobs. There are two reasons for
705 // having no compile jobs: First, we compiled everything we wanted. Second,
706 // we ran out of code cache so compilation has been disabled. In the latter
707 // case we perform code cache sweeps to free memory such that we can re-enable
708 // compilation.
709 while (_first == NULL) {
710 // Exit loop if compilation is disabled forever
711 if (CompileBroker::is_compilation_disabled_forever()) {
712 return NULL;
713 }
714
715 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
716 // Wait a certain amount of time to possibly do another sweep.
717 // We must wait until stack scanning has happened so that we can
718 // transition a method's state from 'not_entrant' to 'zombie'.
719 long wait_time = NmethodSweepCheckInterval * 1000;
720 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
721 // Only one thread at a time can do sweeping. Scale the
722 // wait time according to the number of compiler threads.
723 // As a result, the next sweep is likely to happen every 100ms
724 // with an arbitrary number of threads that do sweeping.
725 wait_time = 100 * CICompilerCount;
726 }
727 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
728 if (timeout) {
729 MutexUnlocker ul(lock());
730 NMethodSweeper::possibly_sweep();
731 }
732 } else {
733 // If there are no compilation tasks and we can compile new jobs
734 // (i.e., there is enough free space in the code cache) there is
735 // no need to invoke the sweeper. As a result, the hotness of methods
736 // remains unchanged. This behavior is desired, since we want to keep
737 // the stable state, i.e., we do not want to evict methods from the
738 // code cache if it is unnecessary.
739 // We need a timed wait here, since compiler threads can exit if compilation
740 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
741 // is not critical and we do not want idle compiler threads to wake up too often.
742 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
743 }
744 }
745
746 if (CompileBroker::is_compilation_disabled_forever()) {
747 return NULL;
748 }
749
750 CompileTask* task;
751 {
752 No_Safepoint_Verifier nsv;
753 task = CompilationPolicy::policy()->select_task(this);
754 }
755 remove(task);
756 purge_stale_tasks(); // may temporarily release MCQ lock
757 return task;
758 }
759
760 // Clean & deallocate stale compile tasks.
761 // Temporarily releases MethodCompileQueue lock.
762 void CompileQueue::purge_stale_tasks() {
763 assert(lock()->owned_by_self(), "must own lock");
764 if (_first_stale != NULL) {
765 // Stale tasks are purged when MCQ lock is released,
766 // but _first_stale updates are protected by MCQ lock.
767 // Once task processing starts and MCQ lock is released,
768 // other compiler threads can reuse _first_stale.
769 CompileTask* head = _first_stale;
770 _first_stale = NULL;
771 {
772 MutexUnlocker ul(lock());
773 for (CompileTask* task = head; task != NULL; ) {
774 CompileTask* next_task = task->next();
775 CompileTaskWrapper ctw(task); // Frees the task
776 task->set_failure_reason("stale task");
777 task = next_task;
778 }
779 }
780 }
781 }
782
783 void CompileQueue::remove(CompileTask* task) {
784 assert(lock()->owned_by_self(), "must own lock");
785 if (task->prev() != NULL) {
786 task->prev()->set_next(task->next());
787 } else {
788 // max is the first element
789 assert(task == _first, "Sanity");
790 _first = task->next();
791 }
792
793 if (task->next() != NULL) {
794 task->next()->set_prev(task->prev());
795 } else {
796 // max is the last element
797 assert(task == _last, "Sanity");
798 _last = task->prev();
799 }
800 --_size;
801 }
802
803 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
804 assert(lock()->owned_by_self(), "must own lock");
805 remove(task);
806
807 // Enqueue the task for reclamation (should be done outside MCQ lock)
808 task->set_next(_first_stale);
809 task->set_prev(NULL);
810 _first_stale = task;
811 }
812
813 // methods in the compile queue need to be marked as used on the stack
814 // so that they don't get reclaimed by Redefine Classes
815 void CompileQueue::mark_on_stack() {
816 CompileTask* task = _first;
817 while (task != NULL) {
818 task->mark_on_stack();
819 task = task->next();
820 }
821 }
822
823 #ifndef PRODUCT
824 /**
825 * Print entire compilation queue.
826 */
827 void CompileQueue::print() {
828 if (CIPrintCompileQueue) {
829 ttyLocker ttyl;
830 tty->print_cr("Contents of %s", name());
831 tty->print_cr("----------------------");
832 CompileTask* task = _first;
833 while (task != NULL) {
834 task->print_line();
835 task = task->next();
836 }
837 tty->print_cr("----------------------");
838 }
839 }
840 #endif // PRODUCT
841
842 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
843
844 _current_method[0] = '\0';
845 _compile_type = CompileBroker::no_compile;
846
847 if (UsePerfData) {
848 ResourceMark rm;
849
850 // create the thread instance name space string - don't create an
851 // instance subspace if instance is -1 - keeps the adapterThread
852 // counters from having a ".0" namespace.
853 const char* thread_i = (instance == -1) ? thread_name :
854 PerfDataManager::name_space(thread_name, instance);
855
856
857 char* name = PerfDataManager::counter_name(thread_i, "method");
858 _perf_current_method =
859 PerfDataManager::create_string_variable(SUN_CI, name,
860 cmname_buffer_length,
861 _current_method, CHECK);
862
863 name = PerfDataManager::counter_name(thread_i, "type");
864 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
865 PerfData::U_None,
866 (jlong)_compile_type,
867 CHECK);
868
869 name = PerfDataManager::counter_name(thread_i, "time");
870 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
871 PerfData::U_Ticks, CHECK);
872
873 name = PerfDataManager::counter_name(thread_i, "compiles");
874 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
875 PerfData::U_Events, CHECK);
876 }
877 }
878
879 // ------------------------------------------------------------------
880 // CompileBroker::compilation_init
881 //
882 // Initialize the Compilation object
883 void CompileBroker::compilation_init() {
884 _last_method_compiled[0] = '\0';
885
886 // No need to initialize compilation system if we do not use it.
887 if (!UseCompiler) {
888 return;
889 }
890 #ifndef SHARK
891 // Set the interface to the current compiler(s).
892 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
893 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
894 #ifdef COMPILER1
895 if (c1_count > 0) {
896 _compilers[0] = new Compiler();
897 }
898 #endif // COMPILER1
899
900 #ifdef COMPILER2
901 if (c2_count > 0) {
902 _compilers[1] = new C2Compiler();
903 }
904 #endif // COMPILER2
905
906 #else // SHARK
907 int c1_count = 0;
908 int c2_count = 1;
909
910 _compilers[1] = new SharkCompiler();
911 #endif // SHARK
912
913 // Start the CompilerThreads
914 init_compiler_threads(c1_count, c2_count);
915 // totalTime performance counter is always created as it is required
916 // by the implementation of java.lang.management.CompilationMBean.
917 {
918 EXCEPTION_MARK;
919 _perf_total_compilation =
920 PerfDataManager::create_counter(JAVA_CI, "totalTime",
921 PerfData::U_Ticks, CHECK);
922 }
923
924
925 if (UsePerfData) {
926
927 EXCEPTION_MARK;
928
929 // create the jvmstat performance counters
930 _perf_osr_compilation =
931 PerfDataManager::create_counter(SUN_CI, "osrTime",
932 PerfData::U_Ticks, CHECK);
933
934 _perf_standard_compilation =
935 PerfDataManager::create_counter(SUN_CI, "standardTime",
936 PerfData::U_Ticks, CHECK);
937
938 _perf_total_bailout_count =
939 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
940 PerfData::U_Events, CHECK);
941
942 _perf_total_invalidated_count =
943 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
944 PerfData::U_Events, CHECK);
945
946 _perf_total_compile_count =
947 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
948 PerfData::U_Events, CHECK);
949 _perf_total_osr_compile_count =
950 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
951 PerfData::U_Events, CHECK);
952
953 _perf_total_standard_compile_count =
954 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
955 PerfData::U_Events, CHECK);
956
957 _perf_sum_osr_bytes_compiled =
958 PerfDataManager::create_counter(SUN_CI, "osrBytes",
959 PerfData::U_Bytes, CHECK);
960
961 _perf_sum_standard_bytes_compiled =
962 PerfDataManager::create_counter(SUN_CI, "standardBytes",
963 PerfData::U_Bytes, CHECK);
964
965 _perf_sum_nmethod_size =
966 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
967 PerfData::U_Bytes, CHECK);
968
969 _perf_sum_nmethod_code_size =
970 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
971 PerfData::U_Bytes, CHECK);
972
973 _perf_last_method =
974 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
975 CompilerCounters::cmname_buffer_length,
976 "", CHECK);
977
978 _perf_last_failed_method =
979 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
980 CompilerCounters::cmname_buffer_length,
981 "", CHECK);
982
983 _perf_last_invalidated_method =
984 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
985 CompilerCounters::cmname_buffer_length,
986 "", CHECK);
987
988 _perf_last_compile_type =
989 PerfDataManager::create_variable(SUN_CI, "lastType",
990 PerfData::U_None,
991 (jlong)CompileBroker::no_compile,
992 CHECK);
993
994 _perf_last_compile_size =
995 PerfDataManager::create_variable(SUN_CI, "lastSize",
996 PerfData::U_Bytes,
997 (jlong)CompileBroker::no_compile,
998 CHECK);
999
1000
1001 _perf_last_failed_type =
1002 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
1003 PerfData::U_None,
1004 (jlong)CompileBroker::no_compile,
1005 CHECK);
1006
1007 _perf_last_invalidated_type =
1008 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1009 PerfData::U_None,
1010 (jlong)CompileBroker::no_compile,
1011 CHECK);
1012 }
1013
1014 _initialized = true;
1015 }
1016
1017
1018 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1019 AbstractCompiler* comp, TRAPS) {
1020 CompilerThread* compiler_thread = NULL;
1021
1022 Klass* k =
1023 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1024 true, CHECK_0);
1025 instanceKlassHandle klass (THREAD, k);
1026 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1027 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1028
1029 // Initialize thread_oop to put it into the system threadGroup
1030 Handle thread_group (THREAD, Universe::system_thread_group());
1031 JavaValue result(T_VOID);
1032 JavaCalls::call_special(&result, thread_oop,
1033 klass,
1034 vmSymbols::object_initializer_name(),
1035 vmSymbols::threadgroup_string_void_signature(),
1036 thread_group,
1037 string,
1038 CHECK_0);
1039
1040 {
1041 MutexLocker mu(Threads_lock, THREAD);
1042 compiler_thread = new CompilerThread(queue, counters);
1043 // At this point the new CompilerThread data-races with this startup
1044 // thread (which I believe is the primoridal thread and NOT the VM
1045 // thread). This means Java bytecodes being executed at startup can
1046 // queue compile jobs which will run at whatever default priority the
1047 // newly created CompilerThread runs at.
1048
1049
1050 // At this point it may be possible that no osthread was created for the
1051 // JavaThread due to lack of memory. We would have to throw an exception
1052 // in that case. However, since this must work and we do not allow
1053 // exceptions anyway, check and abort if this fails.
1054
1055 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1056 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1057 "unable to create new native thread");
1058 }
1059
1060 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1061
1062 // Note that this only sets the JavaThread _priority field, which by
1063 // definition is limited to Java priorities and not OS priorities.
1064 // The os-priority is set in the CompilerThread startup code itself
1065
1066 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1067
1068 // Note that we cannot call os::set_priority because it expects Java
1069 // priorities and we are *explicitly* using OS priorities so that it's
1070 // possible to set the compiler thread priority higher than any Java
1071 // thread.
1072
1073 int native_prio = CompilerThreadPriority;
1074 if (native_prio == -1) {
1075 if (UseCriticalCompilerThreadPriority) {
1076 native_prio = os::java_to_os_priority[CriticalPriority];
1077 } else {
1078 native_prio = os::java_to_os_priority[NearMaxPriority];
1079 }
1080 }
1081 os::set_native_priority(compiler_thread, native_prio);
1082
1083 java_lang_Thread::set_daemon(thread_oop());
1084
1085 compiler_thread->set_threadObj(thread_oop());
1086 compiler_thread->set_compiler(comp);
1087 Threads::add(compiler_thread);
1088 Thread::start(compiler_thread);
1089 }
1090
1091 // Let go of Threads_lock before yielding
1092 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1093
1094 return compiler_thread;
1095 }
1096
1097
1098 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1099 EXCEPTION_MARK;
1100 #if !defined(ZERO) && !defined(SHARK)
1101 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1102 #endif // !ZERO && !SHARK
1103 // Initialize the compilation queue
1104 if (c2_compiler_count > 0) {
1105 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1106 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1107 }
1108 if (c1_compiler_count > 0) {
1109 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1110 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1111 }
1112
1113 int compiler_count = c1_compiler_count + c2_compiler_count;
1114
1115 _compiler_threads =
1116 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1117
1118 char name_buffer[256];
1119 for (int i = 0; i < c2_compiler_count; i++) {
1120 // Create a name for our thread.
1121 sprintf(name_buffer, "C2 CompilerThread%d", i);
1122 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1123 // Shark and C2
1124 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1125 _compiler_threads->append(new_thread);
1126 }
1127
1128 for (int i = c2_compiler_count; i < compiler_count; i++) {
1129 // Create a name for our thread.
1130 sprintf(name_buffer, "C1 CompilerThread%d", i);
1131 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1132 // C1
1133 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1134 _compiler_threads->append(new_thread);
1135 }
1136
1137 if (UsePerfData) {
1138 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1139 }
1140 }
1141
1142
1143 /**
1144 * Set the methods on the stack as on_stack so that redefine classes doesn't
1145 * reclaim them. This method is executed at a safepoint.
1146 */
1147 void CompileBroker::mark_on_stack() {
1148 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1149 // Since we are at a safepoint, we do not need a lock to access
1150 // the compile queues.
1151 if (_c2_compile_queue != NULL) {
1152 _c2_compile_queue->mark_on_stack();
1153 }
1154 if (_c1_compile_queue != NULL) {
1155 _c1_compile_queue->mark_on_stack();
1156 }
1157 }
1158
1159 // ------------------------------------------------------------------
1160 // CompileBroker::compile_method
1161 //
1162 // Request compilation of a method.
1163 void CompileBroker::compile_method_base(methodHandle method,
1164 int osr_bci,
1165 int comp_level,
1166 methodHandle hot_method,
1167 int hot_count,
1168 const char* comment,
1169 Thread* thread) {
1170 // do nothing if compiler thread(s) is not available
1171 if (!_initialized) {
1172 return;
1173 }
1174
1175 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1176 assert(method->method_holder()->oop_is_instance(),
1177 "sanity check");
1178 assert(!method->method_holder()->is_not_initialized(),
1179 "method holder must be initialized");
1180 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1181
1182 if (CIPrintRequests) {
1183 tty->print("request: ");
1184 method->print_short_name(tty);
1185 if (osr_bci != InvocationEntryBci) {
1186 tty->print(" osr_bci: %d", osr_bci);
1187 }
1188 tty->print(" comment: %s count: %d", comment, hot_count);
1189 if (!hot_method.is_null()) {
1190 tty->print(" hot: ");
1191 if (hot_method() != method()) {
1192 hot_method->print_short_name(tty);
1193 } else {
1194 tty->print("yes");
1195 }
1196 }
1197 tty->cr();
1198 }
1199
1200 // A request has been made for compilation. Before we do any
1201 // real work, check to see if the method has been compiled
1202 // in the meantime with a definitive result.
1203 if (compilation_is_complete(method, osr_bci, comp_level)) {
1204 return;
1205 }
1206
1207 #ifndef PRODUCT
1208 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1209 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1210 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1211 return;
1212 }
1213 }
1214 #endif
1215
1216 // If this method is already in the compile queue, then
1217 // we do not block the current thread.
1218 if (compilation_is_in_queue(method)) {
1219 // We may want to decay our counter a bit here to prevent
1220 // multiple denied requests for compilation. This is an
1221 // open compilation policy issue. Note: The other possibility,
1222 // in the case that this is a blocking compile request, is to have
1223 // all subsequent blocking requesters wait for completion of
1224 // ongoing compiles. Note that in this case we'll need a protocol
1225 // for freeing the associated compile tasks. [Or we could have
1226 // a single static monitor on which all these waiters sleep.]
1227 return;
1228 }
1229
1230 // If the requesting thread is holding the pending list lock
1231 // then we just return. We can't risk blocking while holding
1232 // the pending list lock or a 3-way deadlock may occur
1233 // between the reference handler thread, a GC (instigated
1234 // by a compiler thread), and compiled method registration.
1235 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1236 return;
1237 }
1238
1239 if (TieredCompilation) {
1240 // Tiered policy requires MethodCounters to exist before adding a method to
1241 // the queue. Create if we don't have them yet.
1242 method->get_method_counters(thread);
1243 }
1244
1245 // Outputs from the following MutexLocker block:
1246 CompileTask* task = NULL;
1247 bool blocking = false;
1248 CompileQueue* queue = compile_queue(comp_level);
1249
1250 // Acquire our lock.
1251 {
1252 MutexLocker locker(queue->lock(), thread);
1253
1254 // Make sure the method has not slipped into the queues since
1255 // last we checked; note that those checks were "fast bail-outs".
1256 // Here we need to be more careful, see 14012000 below.
1257 if (compilation_is_in_queue(method)) {
1258 return;
1259 }
1260
1261 // We need to check again to see if the compilation has
1262 // completed. A previous compilation may have registered
1263 // some result.
1264 if (compilation_is_complete(method, osr_bci, comp_level)) {
1265 return;
1266 }
1267
1268 // We now know that this compilation is not pending, complete,
1269 // or prohibited. Assign a compile_id to this compilation
1270 // and check to see if it is in our [Start..Stop) range.
1271 int compile_id = assign_compile_id(method, osr_bci);
1272 if (compile_id == 0) {
1273 // The compilation falls outside the allowed range.
1274 return;
1275 }
1276
1277 // Should this thread wait for completion of the compile?
1278 blocking = is_compile_blocking();
1279
1280 // We will enter the compilation in the queue.
1281 // 14012000: Note that this sets the queued_for_compile bits in
1282 // the target method. We can now reason that a method cannot be
1283 // queued for compilation more than once, as follows:
1284 // Before a thread queues a task for compilation, it first acquires
1285 // the compile queue lock, then checks if the method's queued bits
1286 // are set or it has already been compiled. Thus there can not be two
1287 // instances of a compilation task for the same method on the
1288 // compilation queue. Consider now the case where the compilation
1289 // thread has already removed a task for that method from the queue
1290 // and is in the midst of compiling it. In this case, the
1291 // queued_for_compile bits must be set in the method (and these
1292 // will be visible to the current thread, since the bits were set
1293 // under protection of the compile queue lock, which we hold now.
1294 // When the compilation completes, the compiler thread first sets
1295 // the compilation result and then clears the queued_for_compile
1296 // bits. Neither of these actions are protected by a barrier (or done
1297 // under the protection of a lock), so the only guarantee we have
1298 // (on machines with TSO (Total Store Order)) is that these values
1299 // will update in that order. As a result, the only combinations of
1300 // these bits that the current thread will see are, in temporal order:
1301 // <RESULT, QUEUE> :
1302 // <0, 1> : in compile queue, but not yet compiled
1303 // <1, 1> : compiled but queue bit not cleared
1304 // <1, 0> : compiled and queue bit cleared
1305 // Because we first check the queue bits then check the result bits,
1306 // we are assured that we cannot introduce a duplicate task.
1307 // Note that if we did the tests in the reverse order (i.e. check
1308 // result then check queued bit), we could get the result bit before
1309 // the compilation completed, and the queue bit after the compilation
1310 // completed, and end up introducing a "duplicate" (redundant) task.
1311 // In that case, the compiler thread should first check if a method
1312 // has already been compiled before trying to compile it.
1313 // NOTE: in the event that there are multiple compiler threads and
1314 // there is de-optimization/recompilation, things will get hairy,
1315 // and in that case it's best to protect both the testing (here) of
1316 // these bits, and their updating (here and elsewhere) under a
1317 // common lock.
1318 task = create_compile_task(queue,
1319 compile_id, method,
1320 osr_bci, comp_level,
1321 hot_method, hot_count, comment,
1322 blocking);
1323 }
1324
1325 if (blocking) {
1326 wait_for_completion(task);
1327 }
1328 }
1329
1330
1331 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1332 int comp_level,
1333 methodHandle hot_method, int hot_count,
1334 const char* comment, Thread* THREAD) {
1335 // make sure arguments make sense
1336 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1337 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1338 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1339 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1340 // allow any levels for WhiteBox
1341 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1342 // return quickly if possible
1343
1344 // lock, make sure that the compilation
1345 // isn't prohibited in a straightforward way.
1346 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1347 if (comp == NULL || !comp->can_compile_method(method) ||
1348 compilation_is_prohibited(method, osr_bci, comp_level)) {
1349 return NULL;
1350 }
1351
1352 if (osr_bci == InvocationEntryBci) {
1353 // standard compilation
1354 nmethod* method_code = method->code();
1355 if (method_code != NULL) {
1356 if (compilation_is_complete(method, osr_bci, comp_level)) {
1357 return method_code;
1358 }
1359 }
1360 if (method->is_not_compilable(comp_level)) {
1361 return NULL;
1362 }
1363 } else {
1364 // osr compilation
1365 #ifndef TIERED
1366 // seems like an assert of dubious value
1367 assert(comp_level == CompLevel_highest_tier,
1368 "all OSR compiles are assumed to be at a single compilation lavel");
1369 #endif // TIERED
1370 // We accept a higher level osr method
1371 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1372 if (nm != NULL) return nm;
1373 if (method->is_not_osr_compilable(comp_level)) return NULL;
1374 }
1375
1376 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1377 // some prerequisites that are compiler specific
1378 if (comp->is_c2() || comp->is_shark()) {
1379 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1380 // Resolve all classes seen in the signature of the method
1381 // we are compiling.
1382 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1383 }
1384
1385 // If the method is native, do the lookup in the thread requesting
1386 // the compilation. Native lookups can load code, which is not
1387 // permitted during compilation.
1388 //
1389 // Note: A native method implies non-osr compilation which is
1390 // checked with an assertion at the entry of this method.
1391 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1392 bool in_base_library;
1393 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1394 if (HAS_PENDING_EXCEPTION) {
1395 // In case of an exception looking up the method, we just forget
1396 // about it. The interpreter will kick-in and throw the exception.
1397 method->set_not_compilable(); // implies is_not_osr_compilable()
1398 CLEAR_PENDING_EXCEPTION;
1399 return NULL;
1400 }
1401 assert(method->has_native_function(), "must have native code by now");
1402 }
1403
1404 // RedefineClasses() has replaced this method; just return
1405 if (method->is_old()) {
1406 return NULL;
1407 }
1408
1409 // JVMTI -- post_compile_event requires jmethod_id() that may require
1410 // a lock the compiling thread can not acquire. Prefetch it here.
1411 if (JvmtiExport::should_post_compiled_method_load()) {
1412 method->jmethod_id();
1413 }
1414
1415 // do the compilation
1416 if (method->is_native()) {
1417 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1418 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1419 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1420 //
1421 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1422 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1423 AdapterHandlerLibrary::create_native_wrapper(method);
1424 } else {
1425 return NULL;
1426 }
1427 } else {
1428 // If the compiler is shut off due to code cache getting full
1429 // fail out now so blocking compiles dont hang the java thread
1430 if (!should_compile_new_jobs()) {
1431 CompilationPolicy::policy()->delay_compilation(method());
1432 return NULL;
1433 }
1434 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1435 }
1436
1437 // return requested nmethod
1438 // We accept a higher level osr method
1439 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1440 }
1441
1442
1443 // ------------------------------------------------------------------
1444 // CompileBroker::compilation_is_complete
1445 //
1446 // See if compilation of this method is already complete.
1447 bool CompileBroker::compilation_is_complete(methodHandle method,
1448 int osr_bci,
1449 int comp_level) {
1450 bool is_osr = (osr_bci != standard_entry_bci);
1451 if (is_osr) {
1452 if (method->is_not_osr_compilable(comp_level)) {
1453 return true;
1454 } else {
1455 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1456 return (result != NULL);
1457 }
1458 } else {
1459 if (method->is_not_compilable(comp_level)) {
1460 return true;
1461 } else {
1462 nmethod* result = method->code();
1463 if (result == NULL) return false;
1464 return comp_level == result->comp_level();
1465 }
1466 }
1467 }
1468
1469
1470 /**
1471 * See if this compilation is already requested.
1472 *
1473 * Implementation note: there is only a single "is in queue" bit
1474 * for each method. This means that the check below is overly
1475 * conservative in the sense that an osr compilation in the queue
1476 * will block a normal compilation from entering the queue (and vice
1477 * versa). This can be remedied by a full queue search to disambiguate
1478 * cases. If it is deemed profitable, this may be done.
1479 */
1480 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1481 return method->queued_for_compilation();
1482 }
1483
1484 // ------------------------------------------------------------------
1485 // CompileBroker::compilation_is_prohibited
1486 //
1487 // See if this compilation is not allowed.
1488 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1489 bool is_native = method->is_native();
1490 // Some compilers may not support the compilation of natives.
1491 AbstractCompiler *comp = compiler(comp_level);
1492 if (is_native &&
1493 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1494 method->set_not_compilable_quietly(comp_level);
1495 return true;
1496 }
1497
1498 bool is_osr = (osr_bci != standard_entry_bci);
1499 // Some compilers may not support on stack replacement.
1500 if (is_osr &&
1501 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1502 method->set_not_osr_compilable(comp_level);
1503 return true;
1504 }
1505
1506 // The method may be explicitly excluded by the user.
1507 bool quietly;
1508 if (CompilerOracle::should_exclude(method, quietly)) {
1509 if (!quietly) {
1510 // This does not happen quietly...
1511 ResourceMark rm;
1512 tty->print("### Excluding %s:%s",
1513 method->is_native() ? "generation of native wrapper" : "compile",
1514 (method->is_static() ? " static" : ""));
1515 method->print_short_name(tty);
1516 tty->cr();
1517 }
1518 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1519 }
1520
1521 return false;
1522 }
1523
1524 /**
1525 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1526 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1527 * The function also allows to generate separate compilation IDs for OSR compilations.
1528 */
1529 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1530 #ifdef ASSERT
1531 bool is_osr = (osr_bci != standard_entry_bci);
1532 int id;
1533 if (method->is_native()) {
1534 assert(!is_osr, "can't be osr");
1535 // Adapters, native wrappers and method handle intrinsics
1536 // should be generated always.
1537 return Atomic::add(1, &_compilation_id);
1538 } else if (CICountOSR && is_osr) {
1539 id = Atomic::add(1, &_osr_compilation_id);
1540 if (CIStartOSR <= id && id < CIStopOSR) {
1541 return id;
1542 }
1543 } else {
1544 id = Atomic::add(1, &_compilation_id);
1545 if (CIStart <= id && id < CIStop) {
1546 return id;
1547 }
1548 }
1549
1550 // Method was not in the appropriate compilation range.
1551 method->set_not_compilable_quietly();
1552 return 0;
1553 #else
1554 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1555 // only _compilation_id is incremented.
1556 return Atomic::add(1, &_compilation_id);
1557 #endif
1558 }
1559
1560 /**
1561 * Should the current thread block until this compilation request
1562 * has been fulfilled?
1563 */
1564 bool CompileBroker::is_compile_blocking() {
1565 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1566 return !BackgroundCompilation;
1567 }
1568
1569
1570 // ------------------------------------------------------------------
1571 // CompileBroker::preload_classes
1572 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1573 // Move this code over from c1_Compiler.cpp
1574 ShouldNotReachHere();
1575 }
1576
1577
1578 // ------------------------------------------------------------------
1579 // CompileBroker::create_compile_task
1580 //
1581 // Create a CompileTask object representing the current request for
1582 // compilation. Add this task to the queue.
1583 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1584 int compile_id,
1585 methodHandle method,
1586 int osr_bci,
1587 int comp_level,
1588 methodHandle hot_method,
1589 int hot_count,
1590 const char* comment,
1591 bool blocking) {
1592 CompileTask* new_task = CompileTask::allocate();
1593 new_task->initialize(compile_id, method, osr_bci, comp_level,
1594 hot_method, hot_count, comment,
1595 blocking);
1596 queue->add(new_task);
1597 return new_task;
1598 }
1599
1600
1601 /**
1602 * Wait for the compilation task to complete.
1603 */
1604 void CompileBroker::wait_for_completion(CompileTask* task) {
1605 if (CIPrintCompileQueue) {
1606 ttyLocker ttyl;
1607 tty->print_cr("BLOCKING FOR COMPILE");
1608 }
1609
1610 assert(task->is_blocking(), "can only wait on blocking task");
1611
1612 JavaThread* thread = JavaThread::current();
1613 thread->set_blocked_on_compilation(true);
1614
1615 methodHandle method(thread, task->method());
1616 {
1617 MutexLocker waiter(task->lock(), thread);
1618
1619 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1620 task->lock()->wait();
1621 }
1622 }
1623
1624 thread->set_blocked_on_compilation(false);
1625 if (is_compilation_disabled_forever()) {
1626 CompileTask::free(task);
1627 return;
1628 }
1629
1630 // It is harmless to check this status without the lock, because
1631 // completion is a stable property (until the task object is recycled).
1632 assert(task->is_complete(), "Compilation should have completed");
1633 assert(task->code_handle() == NULL, "must be reset");
1634
1635 // By convention, the waiter is responsible for recycling a
1636 // blocking CompileTask. Since there is only one waiter ever
1637 // waiting on a CompileTask, we know that no one else will
1638 // be using this CompileTask; we can free it.
1639 CompileTask::free(task);
1640 }
1641
1642 /**
1643 * Initialize compiler thread(s) + compiler object(s). The postcondition
1644 * of this function is that the compiler runtimes are initialized and that
1645 * compiler threads can start compiling.
1646 */
1647 bool CompileBroker::init_compiler_runtime() {
1648 CompilerThread* thread = CompilerThread::current();
1649 AbstractCompiler* comp = thread->compiler();
1650 // Final sanity check - the compiler object must exist
1651 guarantee(comp != NULL, "Compiler object must exist");
1652
1653 int system_dictionary_modification_counter;
1654 {
1655 MutexLocker locker(Compile_lock, thread);
1656 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1657 }
1658
1659 {
1660 // Must switch to native to allocate ci_env
1661 ThreadToNativeFromVM ttn(thread);
1662 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1663 // Cache Jvmti state
1664 ci_env.cache_jvmti_state();
1665 // Cache DTrace flags
1666 ci_env.cache_dtrace_flags();
1667
1668 // Switch back to VM state to do compiler initialization
1669 ThreadInVMfromNative tv(thread);
1670 ResetNoHandleMark rnhm;
1671
1672
1673 if (!comp->is_shark()) {
1674 // Perform per-thread and global initializations
1675 comp->initialize();
1676 }
1677 }
1678
1679 if (comp->is_failed()) {
1680 disable_compilation_forever();
1681 // If compiler initialization failed, no compiler thread that is specific to a
1682 // particular compiler runtime will ever start to compile methods.
1683 shutdown_compiler_runtime(comp, thread);
1684 return false;
1685 }
1686
1687 // C1 specific check
1688 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1689 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1690 return false;
1691 }
1692
1693 return true;
1694 }
1695
1696 /**
1697 * If C1 and/or C2 initialization failed, we shut down all compilation.
1698 * We do this to keep things simple. This can be changed if it ever turns
1699 * out to be a problem.
1700 */
1701 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1702 // Free buffer blob, if allocated
1703 if (thread->get_buffer_blob() != NULL) {
1704 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1705 CodeCache::free(thread->get_buffer_blob());
1706 }
1707
1708 if (comp->should_perform_shutdown()) {
1709 // There are two reasons for shutting down the compiler
1710 // 1) compiler runtime initialization failed
1711 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1712 warning("%s initialization failed. Shutting down all compilers", comp->name());
1713
1714 // Only one thread per compiler runtime object enters here
1715 // Set state to shut down
1716 comp->set_shut_down();
1717
1718 // Delete all queued compilation tasks to make compiler threads exit faster.
1719 if (_c1_compile_queue != NULL) {
1720 _c1_compile_queue->free_all();
1721 }
1722
1723 if (_c2_compile_queue != NULL) {
1724 _c2_compile_queue->free_all();
1725 }
1726
1727 // Set flags so that we continue execution with using interpreter only.
1728 UseCompiler = false;
1729 UseInterpreter = true;
1730
1731 // We could delete compiler runtimes also. However, there are references to
1732 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1733 // fail. This can be done later if necessary.
1734 }
1735 }
1736
1737 // ------------------------------------------------------------------
1738 // CompileBroker::compiler_thread_loop
1739 //
1740 // The main loop run by a CompilerThread.
1741 void CompileBroker::compiler_thread_loop() {
1742 CompilerThread* thread = CompilerThread::current();
1743 CompileQueue* queue = thread->queue();
1744 // For the thread that initializes the ciObjectFactory
1745 // this resource mark holds all the shared objects
1746 ResourceMark rm;
1747
1748 // First thread to get here will initialize the compiler interface
1749
1750 if (!ciObjectFactory::is_initialized()) {
1751 ASSERT_IN_VM;
1752 MutexLocker only_one (CompileThread_lock, thread);
1753 if (!ciObjectFactory::is_initialized()) {
1754 ciObjectFactory::initialize();
1755 }
1756 }
1757
1758 // Open a log.
1759 if (LogCompilation) {
1760 init_compiler_thread_log();
1761 }
1762 CompileLog* log = thread->log();
1763 if (log != NULL) {
1764 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1765 thread->name(),
1766 os::current_thread_id(),
1767 os::current_process_id());
1768 log->stamp();
1769 log->end_elem();
1770 }
1771
1772 // If compiler thread/runtime initialization fails, exit the compiler thread
1773 if (!init_compiler_runtime()) {
1774 return;
1775 }
1776
1777 // Poll for new compilation tasks as long as the JVM runs. Compilation
1778 // should only be disabled if something went wrong while initializing the
1779 // compiler runtimes. This, in turn, should not happen. The only known case
1780 // when compiler runtime initialization fails is if there is not enough free
1781 // space in the code cache to generate the necessary stubs, etc.
1782 while (!is_compilation_disabled_forever()) {
1783 // We need this HandleMark to avoid leaking VM handles.
1784 HandleMark hm(thread);
1785
1786 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1787 // the code cache is really full
1788 handle_full_code_cache();
1789 }
1790
1791 CompileTask* task = queue->get();
1792 if (task == NULL) {
1793 continue;
1794 }
1795
1796 // Give compiler threads an extra quanta. They tend to be bursty and
1797 // this helps the compiler to finish up the job.
1798 if( CompilerThreadHintNoPreempt )
1799 os::hint_no_preempt();
1800
1801 // trace per thread time and compile statistics
1802 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1803 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1804
1805 // Assign the task to the current thread. Mark this compilation
1806 // thread as active for the profiler.
1807 CompileTaskWrapper ctw(task);
1808 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1809 task->set_code_handle(&result_handle);
1810 methodHandle method(thread, task->method());
1811
1812 // Never compile a method if breakpoints are present in it
1813 if (method()->number_of_breakpoints() == 0) {
1814 // Compile the method.
1815 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1816 invoke_compiler_on_method(task);
1817 } else {
1818 // After compilation is disabled, remove remaining methods from queue
1819 method->clear_queued_for_compilation();
1820 task->set_failure_reason("compilation is disabled");
1821 }
1822 }
1823 }
1824
1825 // Shut down compiler runtime
1826 shutdown_compiler_runtime(thread->compiler(), thread);
1827 }
1828
1829 // ------------------------------------------------------------------
1830 // CompileBroker::init_compiler_thread_log
1831 //
1832 // Set up state required by +LogCompilation.
1833 void CompileBroker::init_compiler_thread_log() {
1834 CompilerThread* thread = CompilerThread::current();
1835 char file_name[4*K];
1836 FILE* fp = NULL;
1837 intx thread_id = os::current_thread_id();
1838 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1839 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1840 if (dir == NULL) {
1841 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1842 thread_id, os::current_process_id());
1843 } else {
1844 jio_snprintf(file_name, sizeof(file_name),
1845 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1846 os::file_separator(), thread_id, os::current_process_id());
1847 }
1848
1849 fp = fopen(file_name, "wt");
1850 if (fp != NULL) {
1851 if (LogCompilation && Verbose) {
1852 tty->print_cr("Opening compilation log %s", file_name);
1853 }
1854 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1855 if (log == NULL) {
1856 fclose(fp);
1857 return;
1858 }
1859 thread->init_log(log);
1860
1861 if (xtty != NULL) {
1862 ttyLocker ttyl;
1863 // Record any per thread log files
1864 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1865 }
1866 return;
1867 }
1868 }
1869 warning("Cannot open log file: %s", file_name);
1870 }
1871
1872 // ------------------------------------------------------------------
1873 // CompileBroker::set_should_block
1874 //
1875 // Set _should_block.
1876 // Call this from the VM, with Threads_lock held and a safepoint requested.
1877 void CompileBroker::set_should_block() {
1878 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1879 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1880 #ifndef PRODUCT
1881 if (PrintCompilation && (Verbose || WizardMode))
1882 tty->print_cr("notifying compiler thread pool to block");
1883 #endif
1884 _should_block = true;
1885 }
1886
1887 // ------------------------------------------------------------------
1888 // CompileBroker::maybe_block
1889 //
1890 // Call this from the compiler at convenient points, to poll for _should_block.
1891 void CompileBroker::maybe_block() {
1892 if (_should_block) {
1893 #ifndef PRODUCT
1894 if (PrintCompilation && (Verbose || WizardMode))
1895 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1896 #endif
1897 ThreadInVMfromNative tivfn(JavaThread::current());
1898 }
1899 }
1900
1901 // wrapper for CodeCache::print_summary()
1902 static void codecache_print(bool detailed)
1903 {
1904 ResourceMark rm;
1905 stringStream s;
1906 // Dump code cache into a buffer before locking the tty,
1907 {
1908 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1909 CodeCache::print_summary(&s, detailed);
1910 }
1911 ttyLocker ttyl;
1912 tty->print("%s", s.as_string());
1913 }
1914
1915 // ------------------------------------------------------------------
1916 // CompileBroker::invoke_compiler_on_method
1917 //
1918 // Compile a method.
1919 //
1920 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1921 if (PrintCompilation) {
1922 ResourceMark rm;
1923 task->print_line();
1924 }
1925 elapsedTimer time;
1926
1927 CompilerThread* thread = CompilerThread::current();
1928 ResourceMark rm(thread);
1929
1930 if (LogEvents) {
1931 _compilation_log->log_compile(thread, task);
1932 }
1933
1934 // Common flags.
1935 uint compile_id = task->compile_id();
1936 int osr_bci = task->osr_bci();
1937 bool is_osr = (osr_bci != standard_entry_bci);
1938 bool should_log = (thread->log() != NULL);
1939 bool should_break = false;
1940 int task_level = task->comp_level();
1941 {
1942 // create the handle inside it's own block so it can't
1943 // accidentally be referenced once the thread transitions to
1944 // native. The NoHandleMark before the transition should catch
1945 // any cases where this occurs in the future.
1946 methodHandle method(thread, task->method());
1947 should_break = check_break_at(method, compile_id, is_osr);
1948 if (should_log && !CompilerOracle::should_log(method)) {
1949 should_log = false;
1950 }
1951 assert(!method->is_native(), "no longer compile natives");
1952
1953 // Save information about this method in case of failure.
1954 set_last_compile(thread, method, is_osr, task_level);
1955
1956 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1957 }
1958
1959 // Allocate a new set of JNI handles.
1960 push_jni_handle_block();
1961 Method* target_handle = task->method();
1962 int compilable = ciEnv::MethodCompilable;
1963 {
1964 int system_dictionary_modification_counter;
1965 {
1966 MutexLocker locker(Compile_lock, thread);
1967 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1968 }
1969
1970 NoHandleMark nhm;
1971 ThreadToNativeFromVM ttn(thread);
1972
1973 ciEnv ci_env(task, system_dictionary_modification_counter);
1974 if (should_break) {
1975 ci_env.set_break_at_compile(true);
1976 }
1977 if (should_log) {
1978 ci_env.set_log(thread->log());
1979 }
1980 assert(thread->env() == &ci_env, "set by ci_env");
1981 // The thread-env() field is cleared in ~CompileTaskWrapper.
1982
1983 // Cache Jvmti state
1984 ci_env.cache_jvmti_state();
1985
1986 // Cache DTrace flags
1987 ci_env.cache_dtrace_flags();
1988
1989 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1990
1991 bool target_compilable = target->can_be_compiled();
1992
1993 TraceTime t1("compilation", &time);
1994 EventCompilation event;
1995
1996 AbstractCompiler *comp = compiler(task_level);
1997 if (comp == NULL) {
1998 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1999 } else {
2000 comp->compile_method(&ci_env, target, osr_bci);
2001 }
2002
2003 if (!ci_env.failing() && task->code() == NULL) {
2004 //assert(false, "compiler should always document failure");
2005 // The compiler elected, without comment, not to register a result.
2006 // Do not attempt further compilations of this method.
2007 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2008 }
2009
2010 // Copy this bit to the enclosing block:
2011 compilable = ci_env.compilable();
2012
2013 if (ci_env.failing()) {
2014 task->set_failure_reason(ci_env.failure_reason());
2015 const char* retry_message = ci_env.retry_message();
2016 if (_compilation_log != NULL) {
2017 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2018 }
2019 if (PrintCompilation) {
2020 FormatBufferResource msg = retry_message != NULL ?
2021 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2022 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2023 task->print_compilation(tty, msg);
2024 }
2025
2026 #if INCLUDE_ALL_GCS
2027 guarantee(!UseShenandoahGC || !ShenandoahCompileCheck || !target_compilable || (compilable != ciEnv::MethodCompilable_not_at_tier),
2028 err_msg("Not compilable on level %d due to: %s", task_level, ci_env.failure_reason()));
2029 guarantee(!UseShenandoahGC || !ShenandoahCompileCheck || !target_compilable ||(compilable != ciEnv::MethodCompilable_never || !target_compilable),
2030 err_msg("Never compilable due to: %s", ci_env.failure_reason()));
2031 #endif
2032
2033 } else {
2034 task->mark_success();
2035 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2036 if (_compilation_log != NULL) {
2037 nmethod* code = task->code();
2038 if (code != NULL) {
2039 _compilation_log->log_nmethod(thread, code);
2040 }
2041 }
2042 }
2043 // simulate crash during compilation
2044 assert(task->compile_id() != CICrashAt, "just as planned");
2045 if (event.should_commit()) {
2046 event.set_method(target->get_Method());
2047 event.set_compileID(compile_id);
2048 event.set_compileLevel(task->comp_level());
2049 event.set_succeded(task->is_success());
2050 event.set_isOsr(is_osr);
2051 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2052 event.set_inlinedBytes(task->num_inlined_bytecodes());
2053 event.commit();
2054 }
2055 }
2056 pop_jni_handle_block();
2057
2058 methodHandle method(thread, task->method());
2059
2060 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2061
2062 collect_statistics(thread, time, task);
2063
2064 if (PrintCompilation && PrintCompilation2) {
2065 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2066 tty->print("%4d ", compile_id); // print compilation number
2067 tty->print("%s ", (is_osr ? "%" : " "));
2068 if (task->code() != NULL) {
2069 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2070 }
2071 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2072 }
2073
2074 if (PrintCodeCacheOnCompilation)
2075 codecache_print(/* detailed= */ false);
2076
2077 // Disable compilation, if required.
2078 switch (compilable) {
2079 case ciEnv::MethodCompilable_never:
2080 if (is_osr)
2081 method->set_not_osr_compilable_quietly();
2082 else
2083 method->set_not_compilable_quietly();
2084 break;
2085 case ciEnv::MethodCompilable_not_at_tier:
2086 if (is_osr)
2087 method->set_not_osr_compilable_quietly(task_level);
2088 else
2089 method->set_not_compilable_quietly(task_level);
2090 break;
2091 }
2092
2093 // Note that the queued_for_compilation bits are cleared without
2094 // protection of a mutex. [They were set by the requester thread,
2095 // when adding the task to the compile queue -- at which time the
2096 // compile queue lock was held. Subsequently, we acquired the compile
2097 // queue lock to get this task off the compile queue; thus (to belabour
2098 // the point somewhat) our clearing of the bits must be occurring
2099 // only after the setting of the bits. See also 14012000 above.
2100 method->clear_queued_for_compilation();
2101
2102 #ifdef ASSERT
2103 if (CollectedHeap::fired_fake_oom()) {
2104 // The current compile received a fake OOM during compilation so
2105 // go ahead and exit the VM since the test apparently succeeded
2106 tty->print_cr("*** Shutting down VM after successful fake OOM");
2107 vm_exit(0);
2108 }
2109 #endif
2110 }
2111
2112 /**
2113 * The CodeCache is full. Print out warning and disable compilation
2114 * or try code cache cleaning so compilation can continue later.
2115 */
2116 void CompileBroker::handle_full_code_cache() {
2117 UseInterpreter = true;
2118 if (UseCompiler || AlwaysCompileLoopMethods ) {
2119 if (xtty != NULL) {
2120 ResourceMark rm;
2121 stringStream s;
2122 // Dump code cache state into a buffer before locking the tty,
2123 // because log_state() will use locks causing lock conflicts.
2124 CodeCache::log_state(&s);
2125 // Lock to prevent tearing
2126 ttyLocker ttyl;
2127 xtty->begin_elem("code_cache_full");
2128 xtty->print("%s", s.as_string());
2129 xtty->stamp();
2130 xtty->end_elem();
2131 }
2132
2133 CodeCache::report_codemem_full();
2134
2135 #ifndef PRODUCT
2136 if (CompileTheWorld || ExitOnFullCodeCache) {
2137 codecache_print(/* detailed= */ true);
2138 before_exit(JavaThread::current());
2139 exit_globals(); // will delete tty
2140 vm_direct_exit(CompileTheWorld ? 0 : 1);
2141 }
2142 #endif
2143 if (UseCodeCacheFlushing) {
2144 // Since code cache is full, immediately stop new compiles
2145 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2146 NMethodSweeper::log_sweep("disable_compiler");
2147 }
2148 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2149 // without having to consider the state in which the current thread is.
2150 ThreadInVMfromUnknown in_vm;
2151 NMethodSweeper::possibly_sweep();
2152 } else {
2153 disable_compilation_forever();
2154 }
2155
2156 // Print warning only once
2157 if (should_print_compiler_warning()) {
2158 warning("CodeCache is full. Compiler has been disabled.");
2159 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2160 codecache_print(/* detailed= */ true);
2161 }
2162 }
2163 }
2164
2165 // ------------------------------------------------------------------
2166 // CompileBroker::set_last_compile
2167 //
2168 // Record this compilation for debugging purposes.
2169 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2170 ResourceMark rm;
2171 char* method_name = method->name()->as_C_string();
2172 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2173 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2174 char current_method[CompilerCounters::cmname_buffer_length];
2175 size_t maxLen = CompilerCounters::cmname_buffer_length;
2176
2177 if (UsePerfData) {
2178 const char* class_name = method->method_holder()->name()->as_C_string();
2179
2180 size_t s1len = strlen(class_name);
2181 size_t s2len = strlen(method_name);
2182
2183 // check if we need to truncate the string
2184 if (s1len + s2len + 2 > maxLen) {
2185
2186 // the strategy is to lop off the leading characters of the
2187 // class name and the trailing characters of the method name.
2188
2189 if (s2len + 2 > maxLen) {
2190 // lop of the entire class name string, let snprintf handle
2191 // truncation of the method name.
2192 class_name += s1len; // null string
2193 }
2194 else {
2195 // lop off the extra characters from the front of the class name
2196 class_name += ((s1len + s2len + 2) - maxLen);
2197 }
2198 }
2199
2200 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2201 }
2202
2203 if (CICountOSR && is_osr) {
2204 _last_compile_type = osr_compile;
2205 } else {
2206 _last_compile_type = normal_compile;
2207 }
2208 _last_compile_level = comp_level;
2209
2210 if (UsePerfData) {
2211 CompilerCounters* counters = thread->counters();
2212 counters->set_current_method(current_method);
2213 counters->set_compile_type((jlong)_last_compile_type);
2214 }
2215 }
2216
2217
2218 // ------------------------------------------------------------------
2219 // CompileBroker::push_jni_handle_block
2220 //
2221 // Push on a new block of JNI handles.
2222 void CompileBroker::push_jni_handle_block() {
2223 JavaThread* thread = JavaThread::current();
2224
2225 // Allocate a new block for JNI handles.
2226 // Inlined code from jni_PushLocalFrame()
2227 JNIHandleBlock* java_handles = thread->active_handles();
2228 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2229 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2230 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2231 thread->set_active_handles(compile_handles);
2232 }
2233
2234
2235 // ------------------------------------------------------------------
2236 // CompileBroker::pop_jni_handle_block
2237 //
2238 // Pop off the current block of JNI handles.
2239 void CompileBroker::pop_jni_handle_block() {
2240 JavaThread* thread = JavaThread::current();
2241
2242 // Release our JNI handle block
2243 JNIHandleBlock* compile_handles = thread->active_handles();
2244 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2245 thread->set_active_handles(java_handles);
2246 compile_handles->set_pop_frame_link(NULL);
2247 JNIHandleBlock::release_block(compile_handles, thread); // may block
2248 }
2249
2250
2251 // ------------------------------------------------------------------
2252 // CompileBroker::check_break_at
2253 //
2254 // Should the compilation break at the current compilation.
2255 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2256 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2257 return true;
2258 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2259 return true;
2260 } else {
2261 return (compile_id == CIBreakAt);
2262 }
2263 }
2264
2265 // ------------------------------------------------------------------
2266 // CompileBroker::collect_statistics
2267 //
2268 // Collect statistics about the compilation.
2269
2270 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2271 bool success = task->is_success();
2272 methodHandle method (thread, task->method());
2273 uint compile_id = task->compile_id();
2274 bool is_osr = (task->osr_bci() != standard_entry_bci);
2275 nmethod* code = task->code();
2276 CompilerCounters* counters = thread->counters();
2277
2278 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2279 MutexLocker locker(CompileStatistics_lock);
2280
2281 // _perf variables are production performance counters which are
2282 // updated regardless of the setting of the CITime and CITimeEach flags
2283 //
2284 if (!success) {
2285 _total_bailout_count++;
2286 if (UsePerfData) {
2287 _perf_last_failed_method->set_value(counters->current_method());
2288 _perf_last_failed_type->set_value(counters->compile_type());
2289 _perf_total_bailout_count->inc();
2290 }
2291 } else if (code == NULL) {
2292 if (UsePerfData) {
2293 _perf_last_invalidated_method->set_value(counters->current_method());
2294 _perf_last_invalidated_type->set_value(counters->compile_type());
2295 _perf_total_invalidated_count->inc();
2296 }
2297 _total_invalidated_count++;
2298 } else {
2299 // Compilation succeeded
2300
2301 // update compilation ticks - used by the implementation of
2302 // java.lang.management.CompilationMBean
2303 _perf_total_compilation->inc(time.ticks());
2304
2305 _t_total_compilation.add(time);
2306 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2307
2308 if (CITime) {
2309 if (is_osr) {
2310 _t_osr_compilation.add(time);
2311 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2312 } else {
2313 _t_standard_compilation.add(time);
2314 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2315 }
2316 }
2317
2318 if (UsePerfData) {
2319 // save the name of the last method compiled
2320 _perf_last_method->set_value(counters->current_method());
2321 _perf_last_compile_type->set_value(counters->compile_type());
2322 _perf_last_compile_size->set_value(method->code_size() +
2323 task->num_inlined_bytecodes());
2324 if (is_osr) {
2325 _perf_osr_compilation->inc(time.ticks());
2326 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2327 } else {
2328 _perf_standard_compilation->inc(time.ticks());
2329 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2330 }
2331 }
2332
2333 if (CITimeEach) {
2334 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2335 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2336 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2337 }
2338
2339 // Collect counts of successful compilations
2340 _sum_nmethod_size += code->total_size();
2341 _sum_nmethod_code_size += code->insts_size();
2342 _total_compile_count++;
2343
2344 if (UsePerfData) {
2345 _perf_sum_nmethod_size->inc( code->total_size());
2346 _perf_sum_nmethod_code_size->inc(code->insts_size());
2347 _perf_total_compile_count->inc();
2348 }
2349
2350 if (is_osr) {
2351 if (UsePerfData) _perf_total_osr_compile_count->inc();
2352 _total_osr_compile_count++;
2353 } else {
2354 if (UsePerfData) _perf_total_standard_compile_count->inc();
2355 _total_standard_compile_count++;
2356 }
2357 }
2358 // set the current method for the thread to null
2359 if (UsePerfData) counters->set_current_method("");
2360 }
2361
2362 const char* CompileBroker::compiler_name(int comp_level) {
2363 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2364 if (comp == NULL) {
2365 return "no compiler";
2366 } else {
2367 return (comp->name());
2368 }
2369 }
2370
2371 void CompileBroker::print_times() {
2372 tty->cr();
2373 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2374 tty->print_cr("------------------------------------------------");
2375 //0000000000111111111122222222223333333333444444444455555555556666666666
2376 //0123456789012345678901234567890123456789012345678901234567890123456789
2377 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2378 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2379 CompileBroker::_t_standard_compilation.seconds(),
2380 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2381 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);
2382
2383 AbstractCompiler *comp = compiler(CompLevel_simple);
2384 if (comp != NULL) {
2385 comp->print_timers();
2386 }
2387 comp = compiler(CompLevel_full_optimization);
2388 if (comp != NULL) {
2389 comp->print_timers();
2390 }
2391 tty->cr();
2392 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2393 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2394 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2395 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2396 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2397 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2398 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2399 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2400 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2401 tty->cr();
2402 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2403 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2404 }
2405
2406 // Debugging output for failure
2407 void CompileBroker::print_last_compile() {
2408 if ( _last_compile_level != CompLevel_none &&
2409 compiler(_last_compile_level) != NULL &&
2410 _last_method_compiled != NULL &&
2411 _last_compile_type != no_compile) {
2412 if (_last_compile_type == osr_compile) {
2413 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2414 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2415 } else {
2416 tty->print_cr("Last parse: %d+++(%d) %s",
2417 _compilation_id, _last_compile_level, _last_method_compiled);
2418 }
2419 }
2420 }
2421
2422
2423 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2424 #ifndef PRODUCT
2425 st->print_cr("Compiler thread printing unimplemented.");
2426 st->cr();
2427 #endif
2428 }