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 #ifdef COMPILER1
50 #include "c1/c1_Compiler.hpp"
51 #endif
52 #ifdef COMPILER2
53 #include "opto/c2compiler.hpp"
54 #endif
55 #ifdef SHARK
56 #include "shark/sharkCompiler.hpp"
57 #endif
58
59 #ifdef DTRACE_ENABLED
60
61 // Only bother with this argument setup if dtrace is available
62
63 #ifndef USDT2
64 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
65 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
66 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
67 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
68
69 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
70 { \
71 Symbol* klass_name = (method)->klass_name(); \
72 Symbol* name = (method)->name(); \
73 Symbol* signature = (method)->signature(); \
74 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
75 comp_name, strlen(comp_name), \
76 klass_name->bytes(), klass_name->utf8_length(), \
77 name->bytes(), name->utf8_length(), \
78 signature->bytes(), signature->utf8_length()); \
79 }
80
81 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
82 { \
83 Symbol* klass_name = (method)->klass_name(); \
84 Symbol* name = (method)->name(); \
85 Symbol* signature = (method)->signature(); \
86 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
87 comp_name, strlen(comp_name), \
88 klass_name->bytes(), klass_name->utf8_length(), \
89 name->bytes(), name->utf8_length(), \
90 signature->bytes(), signature->utf8_length(), (success)); \
91 }
92
93 #else /* USDT2 */
94
95 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
96 { \
97 Symbol* klass_name = (method)->klass_name(); \
98 Symbol* name = (method)->name(); \
99 Symbol* signature = (method)->signature(); \
100 HOTSPOT_METHOD_COMPILE_BEGIN( \
101 comp_name, strlen(comp_name), \
102 (char *) klass_name->bytes(), klass_name->utf8_length(), \
103 (char *) name->bytes(), name->utf8_length(), \
104 (char *) signature->bytes(), signature->utf8_length()); \
105 }
106
107 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
108 { \
109 Symbol* klass_name = (method)->klass_name(); \
110 Symbol* name = (method)->name(); \
111 Symbol* signature = (method)->signature(); \
112 HOTSPOT_METHOD_COMPILE_END( \
113 comp_name, strlen(comp_name), \
114 (char *) klass_name->bytes(), klass_name->utf8_length(), \
115 (char *) name->bytes(), name->utf8_length(), \
116 (char *) signature->bytes(), signature->utf8_length(), (success)); \
117 }
118 #endif /* USDT2 */
119
120 #else // ndef DTRACE_ENABLED
121
122 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
123 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
124
125 #endif // ndef DTRACE_ENABLED
126
127 bool CompileBroker::_initialized = false;
128 volatile bool CompileBroker::_should_block = false;
129 volatile jint CompileBroker::_print_compilation_warning = 0;
130 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
131
132 // The installed compiler(s)
133 AbstractCompiler* CompileBroker::_compilers[2];
134
135 // These counters are used to assign an unique ID to each compilation.
136 volatile jint CompileBroker::_compilation_id = 0;
137 volatile jint CompileBroker::_osr_compilation_id = 0;
138
139 // Debugging information
140 int CompileBroker::_last_compile_type = no_compile;
141 int CompileBroker::_last_compile_level = CompLevel_none;
142 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
143
144 // Performance counters
145 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
148
149 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
150 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
154
155 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
156 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
159
160 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
161 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
163 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
165 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
166 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
167
168 // Timers and counters for generating statistics
169 elapsedTimer CompileBroker::_t_total_compilation;
170 elapsedTimer CompileBroker::_t_osr_compilation;
171 elapsedTimer CompileBroker::_t_standard_compilation;
172
173 int CompileBroker::_total_bailout_count = 0;
174 int CompileBroker::_total_invalidated_count = 0;
175 int CompileBroker::_total_compile_count = 0;
176 int CompileBroker::_total_osr_compile_count = 0;
177 int CompileBroker::_total_standard_compile_count = 0;
178
179 int CompileBroker::_sum_osr_bytes_compiled = 0;
180 int CompileBroker::_sum_standard_bytes_compiled = 0;
181 int CompileBroker::_sum_nmethod_size = 0;
182 int CompileBroker::_sum_nmethod_code_size = 0;
183
184 long CompileBroker::_peak_compilation_time = 0;
185
186 CompileQueue* CompileBroker::_c2_method_queue = NULL;
187 CompileQueue* CompileBroker::_c1_method_queue = NULL;
188 CompileTask* CompileBroker::_task_free_list = 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 CompileBroker::free_task(task);
257 }
258 }
259
260
261 // ------------------------------------------------------------------
262 // CompileTask::initialize
263 void CompileTask::initialize(int compile_id,
264 methodHandle method,
265 int osr_bci,
266 int comp_level,
267 methodHandle hot_method,
268 int hot_count,
269 const char* comment,
270 bool is_blocking) {
271 assert(!_lock->is_locked(), "bad locking");
272
273 _compile_id = compile_id;
274 _method = method();
275 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
276 _osr_bci = osr_bci;
277 _is_blocking = is_blocking;
278 _comp_level = comp_level;
279 _num_inlined_bytecodes = 0;
280
281 _is_complete = false;
282 _is_success = false;
283 _code_handle = NULL;
284
285 _hot_method = NULL;
286 _hot_method_holder = NULL;
287 _hot_count = hot_count;
288 _time_queued = 0; // tidy
289 _comment = comment;
290 _failure_reason = NULL;
291
292 if (LogCompilation) {
293 _time_queued = os::elapsed_counter();
294 if (hot_method.not_null()) {
295 if (hot_method == method) {
296 _hot_method = _method;
297 } else {
298 _hot_method = hot_method();
299 // only add loader or mirror if different from _method_holder
300 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
301 }
302 }
303 }
304
305 _next = NULL;
306 }
307
308 // ------------------------------------------------------------------
309 // CompileTask::code/set_code
310 nmethod* CompileTask::code() const {
311 if (_code_handle == NULL) return NULL;
312 return _code_handle->code();
313 }
314 void CompileTask::set_code(nmethod* nm) {
315 if (_code_handle == NULL && nm == NULL) return;
316 guarantee(_code_handle != NULL, "");
317 _code_handle->set_code(nm);
318 if (nm == NULL) _code_handle = NULL; // drop the handle also
319 }
320
321 // ------------------------------------------------------------------
322 // CompileTask::free
323 void CompileTask::free() {
324 set_code(NULL);
325 assert(!_lock->is_locked(), "Should not be locked when freed");
326 JNIHandles::destroy_global(_method_holder);
327 JNIHandles::destroy_global(_hot_method_holder);
328 }
329
330
331 void CompileTask::mark_on_stack() {
332 // Mark these methods as something redefine classes cannot remove.
333 _method->set_on_stack(true);
334 if (_hot_method != NULL) {
335 _hot_method->set_on_stack(true);
336 }
337 }
338
339 // ------------------------------------------------------------------
340 // CompileTask::print
341 void CompileTask::print() {
342 tty->print("<CompileTask compile_id=%d ", _compile_id);
343 tty->print("method=");
344 _method->print_name(tty);
345 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
346 _osr_bci, bool_to_str(_is_blocking),
347 bool_to_str(_is_complete), bool_to_str(_is_success));
348 }
349
350
351 // ------------------------------------------------------------------
352 // CompileTask::print_line_on_error
353 //
354 // This function is called by fatal error handler when the thread
355 // causing troubles is a compiler thread.
356 //
357 // Do not grab any lock, do not allocate memory.
358 //
359 // Otherwise it's the same as CompileTask::print_line()
360 //
361 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
362 // print compiler name
363 st->print("%s:", CompileBroker::compiler_name(comp_level()));
364 print_compilation(st);
365 }
366
367 // ------------------------------------------------------------------
368 // CompileTask::print_line
369 void CompileTask::print_line() {
370 ttyLocker ttyl; // keep the following output all in one block
371 // print compiler name if requested
372 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
373 print_compilation();
374 }
375
376
377 // ------------------------------------------------------------------
378 // CompileTask::print_compilation_impl
379 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
380 bool is_osr_method, int osr_bci, bool is_blocking,
381 const char* msg, bool short_form) {
382 if (!short_form) {
383 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
384 }
385 st->print("%4d ", compile_id); // print compilation number
386
387 // For unloaded methods the transition to zombie occurs after the
388 // method is cleared so it's impossible to report accurate
389 // information for that case.
390 bool is_synchronized = false;
391 bool has_exception_handler = false;
392 bool is_native = false;
393 if (method != NULL) {
394 is_synchronized = method->is_synchronized();
395 has_exception_handler = method->has_exception_handler();
396 is_native = method->is_native();
397 }
398 // method attributes
399 const char compile_type = is_osr_method ? '%' : ' ';
400 const char sync_char = is_synchronized ? 's' : ' ';
401 const char exception_char = has_exception_handler ? '!' : ' ';
402 const char blocking_char = is_blocking ? 'b' : ' ';
403 const char native_char = is_native ? 'n' : ' ';
404
405 // print method attributes
406 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
407
408 if (TieredCompilation) {
409 if (comp_level != -1) st->print("%d ", comp_level);
410 else st->print("- ");
411 }
412 st->print(" "); // more indent
413
414 if (method == NULL) {
415 st->print("(method)");
416 } else {
417 method->print_short_name(st);
418 if (is_osr_method) {
419 st->print(" @ %d", osr_bci);
420 }
421 if (method->is_native())
422 st->print(" (native)");
423 else
424 st->print(" (%d bytes)", method->code_size());
425 }
426
427 if (msg != NULL) {
428 st->print(" %s", msg);
429 }
430 if (!short_form) {
431 st->cr();
432 }
433 }
434
435 // ------------------------------------------------------------------
436 // CompileTask::print_inlining
437 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
438 // 1234567
439 st->print(" "); // print timestamp
440 // 1234
441 st->print(" "); // print compilation number
442
443 // method attributes
444 if (method->is_loaded()) {
445 const char sync_char = method->is_synchronized() ? 's' : ' ';
446 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
447 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
448
449 // print method attributes
450 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
451 } else {
452 // %s!bn
453 st->print(" "); // print method attributes
454 }
455
456 if (TieredCompilation) {
457 st->print(" ");
458 }
459 st->print(" "); // more indent
460 st->print(" "); // initial inlining indent
461
462 for (int i = 0; i < inline_level; i++) st->print(" ");
463
464 st->print("@ %d ", bci); // print bci
465 method->print_short_name(st);
466 if (method->is_loaded())
467 st->print(" (%d bytes)", method->code_size());
468 else
469 st->print(" (not loaded)");
470
471 if (msg != NULL) {
472 st->print(" %s", msg);
473 }
474 st->cr();
475 }
476
477 // ------------------------------------------------------------------
478 // CompileTask::print_inline_indent
479 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
480 // 1234567
481 st->print(" "); // print timestamp
482 // 1234
483 st->print(" "); // print compilation number
484 // %s!bn
485 st->print(" "); // print method attributes
486 if (TieredCompilation) {
487 st->print(" ");
488 }
489 st->print(" "); // more indent
490 st->print(" "); // initial inlining indent
491 for (int i = 0; i < inline_level; i++) st->print(" ");
492 }
493
494 // ------------------------------------------------------------------
495 // CompileTask::print_compilation
496 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
497 bool is_osr_method = osr_bci() != InvocationEntryBci;
498 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
499 }
500
501 // ------------------------------------------------------------------
502 // CompileTask::log_task
503 void CompileTask::log_task(xmlStream* log) {
504 Thread* thread = Thread::current();
505 methodHandle method(thread, this->method());
506 ResourceMark rm(thread);
507
508 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
509 log->print(" compile_id='%d'", _compile_id);
510 if (_osr_bci != CompileBroker::standard_entry_bci) {
511 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
512 } // else compile_kind='c2c'
513 if (!method.is_null()) log->method(method);
514 if (_osr_bci != CompileBroker::standard_entry_bci) {
515 log->print(" osr_bci='%d'", _osr_bci);
516 }
517 if (_comp_level != CompLevel_highest_tier) {
518 log->print(" level='%d'", _comp_level);
519 }
520 if (_is_blocking) {
521 log->print(" blocking='1'");
522 }
523 log->stamp();
524 }
525
526
527 // ------------------------------------------------------------------
528 // CompileTask::log_task_queued
529 void CompileTask::log_task_queued() {
530 Thread* thread = Thread::current();
531 ttyLocker ttyl;
532 ResourceMark rm(thread);
533
534 xtty->begin_elem("task_queued");
535 log_task(xtty);
536 if (_comment != NULL) {
537 xtty->print(" comment='%s'", _comment);
538 }
539 if (_hot_method != NULL) {
540 methodHandle hot(thread, _hot_method);
541 methodHandle method(thread, _method);
542 if (hot() != method()) {
543 xtty->method(hot);
544 }
545 }
546 if (_hot_count != 0) {
547 xtty->print(" hot_count='%d'", _hot_count);
548 }
549 xtty->end_elem();
550 }
551
552
553 // ------------------------------------------------------------------
554 // CompileTask::log_task_start
555 void CompileTask::log_task_start(CompileLog* log) {
556 log->begin_head("task");
557 log_task(log);
558 log->end_head();
559 }
560
561
562 // ------------------------------------------------------------------
563 // CompileTask::log_task_done
564 void CompileTask::log_task_done(CompileLog* log) {
565 Thread* thread = Thread::current();
566 methodHandle method(thread, this->method());
567 ResourceMark rm(thread);
568
569 if (!_is_success) {
570 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
571 log->elem("failure reason='%s'", reason);
572 }
573
574 // <task_done ... stamp='1.234'> </task>
575 nmethod* nm = code();
576 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
577 _is_success, nm == NULL ? 0 : nm->content_size(),
578 method->invocation_count());
579 int bec = method->backedge_count();
580 if (bec != 0) log->print(" backedge_count='%d'", bec);
581 // Note: "_is_complete" is about to be set, but is not.
582 if (_num_inlined_bytecodes != 0) {
583 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
584 }
585 log->stamp();
586 log->end_elem();
587 log->tail("task");
588 log->clear_identities(); // next task will have different CI
589 if (log->unflushed_count() > 2000) {
590 log->flush();
591 }
592 log->mark_file_end();
593 }
594
595
596
597 // Add a CompileTask to a CompileQueue
598 void CompileQueue::add(CompileTask* task) {
599 assert(lock()->owned_by_self(), "must own lock");
600
601 task->set_next(NULL);
602 task->set_prev(NULL);
603
604 if (_last == NULL) {
605 // The compile queue is empty.
606 assert(_first == NULL, "queue is empty");
607 _first = task;
608 _last = task;
609 } else {
610 // Append the task to the queue.
611 assert(_last->next() == NULL, "not last");
612 _last->set_next(task);
613 task->set_prev(_last);
614 _last = task;
615 }
616 ++_size;
617
618 // Mark the method as being in the compile queue.
619 task->method()->set_queued_for_compilation();
620
621 if (CIPrintCompileQueue) {
622 print();
623 }
624
625 if (LogCompilation && xtty != NULL) {
626 task->log_task_queued();
627 }
628
629 // Notify CompilerThreads that a task is available.
630 lock()->notify_all();
631 }
632
633 void CompileQueue::delete_all() {
634 assert(lock()->owned_by_self(), "must own lock");
635 if (_first != NULL) {
636 for (CompileTask* task = _first; task != NULL; task = task->next()) {
637 delete task;
638 }
639 _first = NULL;
640 }
641 }
642
643 // ------------------------------------------------------------------
644 // CompileQueue::get
645 //
646 // Get the next CompileTask from a CompileQueue
647 CompileTask* CompileQueue::get() {
648 NMethodSweeper::possibly_sweep();
649
650 MutexLocker locker(lock());
651 // If _first is NULL we have no more compile jobs. There are two reasons for
652 // having no compile jobs: First, we compiled everything we wanted. Second,
653 // we ran out of code cache so compilation has been disabled. In the latter
654 // case we perform code cache sweeps to free memory such that we can re-enable
655 // compilation.
656 while (_first == NULL) {
657 // Exit loop if compilation is disabled forever
658 if (CompileBroker::is_compilation_disabled_forever()) {
659 return NULL;
660 }
661
662 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
663 // Wait a certain amount of time to possibly do another sweep.
664 // We must wait until stack scanning has happened so that we can
665 // transition a method's state from 'not_entrant' to 'zombie'.
666 long wait_time = NmethodSweepCheckInterval * 1000;
667 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
668 // Only one thread at a time can do sweeping. Scale the
669 // wait time according to the number of compiler threads.
670 // As a result, the next sweep is likely to happen every 100ms
671 // with an arbitrary number of threads that do sweeping.
672 wait_time = 100 * CICompilerCount;
673 }
674 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
675 if (timeout) {
676 MutexUnlocker ul(lock());
677 NMethodSweeper::possibly_sweep();
678 }
679 } else {
680 // If there are no compilation tasks and we can compile new jobs
681 // (i.e., there is enough free space in the code cache) there is
682 // no need to invoke the sweeper. As a result, the hotness of methods
683 // remains unchanged. This behavior is desired, since we want to keep
684 // the stable state, i.e., we do not want to evict methods from the
685 // code cache if it is unnecessary.
686 // We need a timed wait here, since compiler threads can exit if compilation
687 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
688 // is not critical and we do not want idle compiler threads to wake up too often.
689 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
690 }
691 }
692
693 if (CompileBroker::is_compilation_disabled_forever()) {
694 return NULL;
695 }
696
697 CompileTask* task;
698 {
699 No_Safepoint_Verifier nsv;
700 task = CompilationPolicy::policy()->select_task(this);
701 }
702 remove(task);
703 purge_stale_tasks(); // may temporarily release MCQ lock
704 return task;
705 }
706
707 // Clean & deallocate stale compile tasks.
708 // Temporarily releases MethodCompileQueue lock.
709 void CompileQueue::purge_stale_tasks() {
710 assert(lock()->owned_by_self(), "must own lock");
711 if (_first_stale != NULL) {
712 // Stale tasks are purged when MCQ lock is released,
713 // but _first_stale updates are protected by MCQ lock.
714 // Once task processing starts and MCQ lock is released,
715 // other compiler threads can reuse _first_stale.
716 CompileTask* head = _first_stale;
717 _first_stale = NULL;
718 {
719 MutexUnlocker ul(lock());
720 for (CompileTask* task = head; task != NULL; ) {
721 CompileTask* next_task = task->next();
722 CompileTaskWrapper ctw(task); // Frees the task
723 task->set_failure_reason("stale task");
724 task = next_task;
725 }
726 }
727 }
728 }
729
730 void CompileQueue::remove(CompileTask* task) {
731 assert(lock()->owned_by_self(), "must own lock");
732 if (task->prev() != NULL) {
733 task->prev()->set_next(task->next());
734 } else {
735 // max is the first element
736 assert(task == _first, "Sanity");
737 _first = task->next();
738 }
739
740 if (task->next() != NULL) {
741 task->next()->set_prev(task->prev());
742 } else {
743 // max is the last element
744 assert(task == _last, "Sanity");
745 _last = task->prev();
746 }
747 --_size;
748 }
749
750 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
751 assert(lock()->owned_by_self(), "must own lock");
752 remove(task);
753
754 // Enqueue the task for reclamation (should be done outside MCQ lock)
755 task->set_next(_first_stale);
756 task->set_prev(NULL);
757 _first_stale = task;
758 }
759
760 // methods in the compile queue need to be marked as used on the stack
761 // so that they don't get reclaimed by Redefine Classes
762 void CompileQueue::mark_on_stack() {
763 CompileTask* task = _first;
764 while (task != NULL) {
765 task->mark_on_stack();
766 task = task->next();
767 }
768 }
769
770 // ------------------------------------------------------------------
771 // CompileQueue::print
772 void CompileQueue::print() {
773 tty->print_cr("Contents of %s", name());
774 tty->print_cr("----------------------");
775 CompileTask* task = _first;
776 while (task != NULL) {
777 task->print_line();
778 task = task->next();
779 }
780 tty->print_cr("----------------------");
781 }
782
783 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
784
785 _current_method[0] = '\0';
786 _compile_type = CompileBroker::no_compile;
787
788 if (UsePerfData) {
789 ResourceMark rm;
790
791 // create the thread instance name space string - don't create an
792 // instance subspace if instance is -1 - keeps the adapterThread
793 // counters from having a ".0" namespace.
794 const char* thread_i = (instance == -1) ? thread_name :
795 PerfDataManager::name_space(thread_name, instance);
796
797
798 char* name = PerfDataManager::counter_name(thread_i, "method");
799 _perf_current_method =
800 PerfDataManager::create_string_variable(SUN_CI, name,
801 cmname_buffer_length,
802 _current_method, CHECK);
803
804 name = PerfDataManager::counter_name(thread_i, "type");
805 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
806 PerfData::U_None,
807 (jlong)_compile_type,
808 CHECK);
809
810 name = PerfDataManager::counter_name(thread_i, "time");
811 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
812 PerfData::U_Ticks, CHECK);
813
814 name = PerfDataManager::counter_name(thread_i, "compiles");
815 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
816 PerfData::U_Events, CHECK);
817 }
818 }
819
820 // ------------------------------------------------------------------
821 // CompileBroker::compilation_init
822 //
823 // Initialize the Compilation object
824 void CompileBroker::compilation_init() {
825 _last_method_compiled[0] = '\0';
826
827 // No need to initialize compilation system if we do not use it.
828 if (!UseCompiler) {
829 return;
830 }
831 #ifndef SHARK
832 // Set the interface to the current compiler(s).
833 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
834 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
835 #ifdef COMPILER1
836 if (c1_count > 0) {
837 _compilers[0] = new Compiler();
838 }
839 #endif // COMPILER1
840
841 #ifdef COMPILER2
842 if (c2_count > 0) {
843 _compilers[1] = new C2Compiler();
844 }
845 #endif // COMPILER2
846
847 #else // SHARK
848 int c1_count = 0;
849 int c2_count = 1;
850
851 _compilers[1] = new SharkCompiler();
852 #endif // SHARK
853
854 // Initialize the CompileTask free list
855 _task_free_list = NULL;
856
857 // Start the CompilerThreads
858 init_compiler_threads(c1_count, c2_count);
859 // totalTime performance counter is always created as it is required
860 // by the implementation of java.lang.management.CompilationMBean.
861 {
862 EXCEPTION_MARK;
863 _perf_total_compilation =
864 PerfDataManager::create_counter(JAVA_CI, "totalTime",
865 PerfData::U_Ticks, CHECK);
866 }
867
868
869 if (UsePerfData) {
870
871 EXCEPTION_MARK;
872
873 // create the jvmstat performance counters
874 _perf_osr_compilation =
875 PerfDataManager::create_counter(SUN_CI, "osrTime",
876 PerfData::U_Ticks, CHECK);
877
878 _perf_standard_compilation =
879 PerfDataManager::create_counter(SUN_CI, "standardTime",
880 PerfData::U_Ticks, CHECK);
881
882 _perf_total_bailout_count =
883 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
884 PerfData::U_Events, CHECK);
885
886 _perf_total_invalidated_count =
887 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
888 PerfData::U_Events, CHECK);
889
890 _perf_total_compile_count =
891 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
892 PerfData::U_Events, CHECK);
893 _perf_total_osr_compile_count =
894 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
895 PerfData::U_Events, CHECK);
896
897 _perf_total_standard_compile_count =
898 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
899 PerfData::U_Events, CHECK);
900
901 _perf_sum_osr_bytes_compiled =
902 PerfDataManager::create_counter(SUN_CI, "osrBytes",
903 PerfData::U_Bytes, CHECK);
904
905 _perf_sum_standard_bytes_compiled =
906 PerfDataManager::create_counter(SUN_CI, "standardBytes",
907 PerfData::U_Bytes, CHECK);
908
909 _perf_sum_nmethod_size =
910 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
911 PerfData::U_Bytes, CHECK);
912
913 _perf_sum_nmethod_code_size =
914 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
915 PerfData::U_Bytes, CHECK);
916
917 _perf_last_method =
918 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
919 CompilerCounters::cmname_buffer_length,
920 "", CHECK);
921
922 _perf_last_failed_method =
923 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
924 CompilerCounters::cmname_buffer_length,
925 "", CHECK);
926
927 _perf_last_invalidated_method =
928 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
929 CompilerCounters::cmname_buffer_length,
930 "", CHECK);
931
932 _perf_last_compile_type =
933 PerfDataManager::create_variable(SUN_CI, "lastType",
934 PerfData::U_None,
935 (jlong)CompileBroker::no_compile,
936 CHECK);
937
938 _perf_last_compile_size =
939 PerfDataManager::create_variable(SUN_CI, "lastSize",
940 PerfData::U_Bytes,
941 (jlong)CompileBroker::no_compile,
942 CHECK);
943
944
945 _perf_last_failed_type =
946 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
947 PerfData::U_None,
948 (jlong)CompileBroker::no_compile,
949 CHECK);
950
951 _perf_last_invalidated_type =
952 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
953 PerfData::U_None,
954 (jlong)CompileBroker::no_compile,
955 CHECK);
956 }
957
958 _initialized = true;
959 }
960
961
962 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
963 AbstractCompiler* comp, TRAPS) {
964 CompilerThread* compiler_thread = NULL;
965
966 Klass* k =
967 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
968 true, CHECK_0);
969 instanceKlassHandle klass (THREAD, k);
970 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
971 Handle string = java_lang_String::create_from_str(name, CHECK_0);
972
973 // Initialize thread_oop to put it into the system threadGroup
974 Handle thread_group (THREAD, Universe::system_thread_group());
975 JavaValue result(T_VOID);
976 JavaCalls::call_special(&result, thread_oop,
977 klass,
978 vmSymbols::object_initializer_name(),
979 vmSymbols::threadgroup_string_void_signature(),
980 thread_group,
981 string,
982 CHECK_0);
983
984 {
985 MutexLocker mu(Threads_lock, THREAD);
986 compiler_thread = new CompilerThread(queue, counters);
987 // At this point the new CompilerThread data-races with this startup
988 // thread (which I believe is the primoridal thread and NOT the VM
989 // thread). This means Java bytecodes being executed at startup can
990 // queue compile jobs which will run at whatever default priority the
991 // newly created CompilerThread runs at.
992
993
994 // At this point it may be possible that no osthread was created for the
995 // JavaThread due to lack of memory. We would have to throw an exception
996 // in that case. However, since this must work and we do not allow
997 // exceptions anyway, check and abort if this fails.
998
999 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1000 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1001 "unable to create new native thread");
1002 }
1003
1004 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1005
1006 // Note that this only sets the JavaThread _priority field, which by
1007 // definition is limited to Java priorities and not OS priorities.
1008 // The os-priority is set in the CompilerThread startup code itself
1009
1010 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1011
1012 // Note that we cannot call os::set_priority because it expects Java
1013 // priorities and we are *explicitly* using OS priorities so that it's
1014 // possible to set the compiler thread priority higher than any Java
1015 // thread.
1016
1017 int native_prio = CompilerThreadPriority;
1018 if (native_prio == -1) {
1019 if (UseCriticalCompilerThreadPriority) {
1020 native_prio = os::java_to_os_priority[CriticalPriority];
1021 } else {
1022 native_prio = os::java_to_os_priority[NearMaxPriority];
1023 }
1024 }
1025 os::set_native_priority(compiler_thread, native_prio);
1026
1027 java_lang_Thread::set_daemon(thread_oop());
1028
1029 compiler_thread->set_threadObj(thread_oop());
1030 compiler_thread->set_compiler(comp);
1031 Threads::add(compiler_thread);
1032 Thread::start(compiler_thread);
1033 }
1034
1035 // Let go of Threads_lock before yielding
1036 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1037
1038 return compiler_thread;
1039 }
1040
1041
1042 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1043 EXCEPTION_MARK;
1044 #if !defined(ZERO) && !defined(SHARK)
1045 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1046 #endif // !ZERO && !SHARK
1047 // Initialize the compilation queue
1048 if (c2_compiler_count > 0) {
1049 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
1050 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1051 }
1052 if (c1_compiler_count > 0) {
1053 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
1054 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1055 }
1056
1057 int compiler_count = c1_compiler_count + c2_compiler_count;
1058
1059 _compiler_threads =
1060 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1061
1062 char name_buffer[256];
1063 for (int i = 0; i < c2_compiler_count; i++) {
1064 // Create a name for our thread.
1065 sprintf(name_buffer, "C2 CompilerThread%d", i);
1066 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1067 // Shark and C2
1068 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK);
1069 _compiler_threads->append(new_thread);
1070 }
1071
1072 for (int i = c2_compiler_count; i < compiler_count; i++) {
1073 // Create a name for our thread.
1074 sprintf(name_buffer, "C1 CompilerThread%d", i);
1075 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1076 // C1
1077 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK);
1078 _compiler_threads->append(new_thread);
1079 }
1080
1081 if (UsePerfData) {
1082 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1083 }
1084 }
1085
1086
1087 // Set the methods on the stack as on_stack so that redefine classes doesn't
1088 // reclaim them
1089 void CompileBroker::mark_on_stack() {
1090 if (_c2_method_queue != NULL) {
1091 _c2_method_queue->mark_on_stack();
1092 }
1093 if (_c1_method_queue != NULL) {
1094 _c1_method_queue->mark_on_stack();
1095 }
1096 }
1097
1098 // ------------------------------------------------------------------
1099 // CompileBroker::compile_method
1100 //
1101 // Request compilation of a method.
1102 void CompileBroker::compile_method_base(methodHandle method,
1103 int osr_bci,
1104 int comp_level,
1105 methodHandle hot_method,
1106 int hot_count,
1107 const char* comment,
1108 Thread* thread) {
1109 // do nothing if compiler thread(s) is not available
1110 if (!_initialized ) {
1111 return;
1112 }
1113
1114 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1115 assert(method->method_holder()->oop_is_instance(),
1116 "sanity check");
1117 assert(!method->method_holder()->is_not_initialized(),
1118 "method holder must be initialized");
1119 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1120
1121 if (CIPrintRequests) {
1122 tty->print("request: ");
1123 method->print_short_name(tty);
1124 if (osr_bci != InvocationEntryBci) {
1125 tty->print(" osr_bci: %d", osr_bci);
1126 }
1127 tty->print(" comment: %s count: %d", comment, hot_count);
1128 if (!hot_method.is_null()) {
1129 tty->print(" hot: ");
1130 if (hot_method() != method()) {
1131 hot_method->print_short_name(tty);
1132 } else {
1133 tty->print("yes");
1134 }
1135 }
1136 tty->cr();
1137 }
1138
1139 // A request has been made for compilation. Before we do any
1140 // real work, check to see if the method has been compiled
1141 // in the meantime with a definitive result.
1142 if (compilation_is_complete(method, osr_bci, comp_level)) {
1143 return;
1144 }
1145
1146 #ifndef PRODUCT
1147 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1148 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1149 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1150 return;
1151 }
1152 }
1153 #endif
1154
1155 // If this method is already in the compile queue, then
1156 // we do not block the current thread.
1157 if (compilation_is_in_queue(method, osr_bci)) {
1158 // We may want to decay our counter a bit here to prevent
1159 // multiple denied requests for compilation. This is an
1160 // open compilation policy issue. Note: The other possibility,
1161 // in the case that this is a blocking compile request, is to have
1162 // all subsequent blocking requesters wait for completion of
1163 // ongoing compiles. Note that in this case we'll need a protocol
1164 // for freeing the associated compile tasks. [Or we could have
1165 // a single static monitor on which all these waiters sleep.]
1166 return;
1167 }
1168
1169 // If the requesting thread is holding the pending list lock
1170 // then we just return. We can't risk blocking while holding
1171 // the pending list lock or a 3-way deadlock may occur
1172 // between the reference handler thread, a GC (instigated
1173 // by a compiler thread), and compiled method registration.
1174 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1175 return;
1176 }
1177
1178 if (TieredCompilation) {
1179 // Tiered policy requires MethodCounters to exist before adding a method to
1180 // the queue. Create if we don't have them yet.
1181 method->get_method_counters(thread);
1182 }
1183
1184 // Outputs from the following MutexLocker block:
1185 CompileTask* task = NULL;
1186 bool blocking = false;
1187 CompileQueue* queue = compile_queue(comp_level);
1188
1189 // Acquire our lock.
1190 {
1191 MutexLocker locker(queue->lock(), thread);
1192
1193 // Make sure the method has not slipped into the queues since
1194 // last we checked; note that those checks were "fast bail-outs".
1195 // Here we need to be more careful, see 14012000 below.
1196 if (compilation_is_in_queue(method, osr_bci)) {
1197 return;
1198 }
1199
1200 // We need to check again to see if the compilation has
1201 // completed. A previous compilation may have registered
1202 // some result.
1203 if (compilation_is_complete(method, osr_bci, comp_level)) {
1204 return;
1205 }
1206
1207 // We now know that this compilation is not pending, complete,
1208 // or prohibited. Assign a compile_id to this compilation
1209 // and check to see if it is in our [Start..Stop) range.
1210 int compile_id = assign_compile_id(method, osr_bci);
1211 if (compile_id == 0) {
1212 // The compilation falls outside the allowed range.
1213 return;
1214 }
1215
1216 // Should this thread wait for completion of the compile?
1217 blocking = is_compile_blocking(method, osr_bci);
1218
1219 // We will enter the compilation in the queue.
1220 // 14012000: Note that this sets the queued_for_compile bits in
1221 // the target method. We can now reason that a method cannot be
1222 // queued for compilation more than once, as follows:
1223 // Before a thread queues a task for compilation, it first acquires
1224 // the compile queue lock, then checks if the method's queued bits
1225 // are set or it has already been compiled. Thus there can not be two
1226 // instances of a compilation task for the same method on the
1227 // compilation queue. Consider now the case where the compilation
1228 // thread has already removed a task for that method from the queue
1229 // and is in the midst of compiling it. In this case, the
1230 // queued_for_compile bits must be set in the method (and these
1231 // will be visible to the current thread, since the bits were set
1232 // under protection of the compile queue lock, which we hold now.
1233 // When the compilation completes, the compiler thread first sets
1234 // the compilation result and then clears the queued_for_compile
1235 // bits. Neither of these actions are protected by a barrier (or done
1236 // under the protection of a lock), so the only guarantee we have
1237 // (on machines with TSO (Total Store Order)) is that these values
1238 // will update in that order. As a result, the only combinations of
1239 // these bits that the current thread will see are, in temporal order:
1240 // <RESULT, QUEUE> :
1241 // <0, 1> : in compile queue, but not yet compiled
1242 // <1, 1> : compiled but queue bit not cleared
1243 // <1, 0> : compiled and queue bit cleared
1244 // Because we first check the queue bits then check the result bits,
1245 // we are assured that we cannot introduce a duplicate task.
1246 // Note that if we did the tests in the reverse order (i.e. check
1247 // result then check queued bit), we could get the result bit before
1248 // the compilation completed, and the queue bit after the compilation
1249 // completed, and end up introducing a "duplicate" (redundant) task.
1250 // In that case, the compiler thread should first check if a method
1251 // has already been compiled before trying to compile it.
1252 // NOTE: in the event that there are multiple compiler threads and
1253 // there is de-optimization/recompilation, things will get hairy,
1254 // and in that case it's best to protect both the testing (here) of
1255 // these bits, and their updating (here and elsewhere) under a
1256 // common lock.
1257 task = create_compile_task(queue,
1258 compile_id, method,
1259 osr_bci, comp_level,
1260 hot_method, hot_count, comment,
1261 blocking);
1262 }
1263
1264 if (blocking) {
1265 wait_for_completion(task);
1266 }
1267 }
1268
1269
1270 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1271 int comp_level,
1272 methodHandle hot_method, int hot_count,
1273 const char* comment, Thread* THREAD) {
1274 // make sure arguments make sense
1275 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1276 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1277 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1278 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1279 // allow any levels for WhiteBox
1280 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1281 // return quickly if possible
1282
1283 // lock, make sure that the compilation
1284 // isn't prohibited in a straightforward way.
1285 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1286 if (comp == NULL || !comp->can_compile_method(method) ||
1287 compilation_is_prohibited(method, osr_bci, comp_level)) {
1288 return NULL;
1289 }
1290
1291 if (osr_bci == InvocationEntryBci) {
1292 // standard compilation
1293 nmethod* method_code = method->code();
1294 if (method_code != NULL) {
1295 if (compilation_is_complete(method, osr_bci, comp_level)) {
1296 return method_code;
1297 }
1298 }
1299 if (method->is_not_compilable(comp_level)) {
1300 return NULL;
1301 }
1302 } else {
1303 // osr compilation
1304 #ifndef TIERED
1305 // seems like an assert of dubious value
1306 assert(comp_level == CompLevel_highest_tier,
1307 "all OSR compiles are assumed to be at a single compilation lavel");
1308 #endif // TIERED
1309 // We accept a higher level osr method
1310 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1311 if (nm != NULL) return nm;
1312 if (method->is_not_osr_compilable(comp_level)) return NULL;
1313 }
1314
1315 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1316 // some prerequisites that are compiler specific
1317 if (comp->is_c2() || comp->is_shark()) {
1318 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1319 // Resolve all classes seen in the signature of the method
1320 // we are compiling.
1321 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1322 }
1323
1324 // If the method is native, do the lookup in the thread requesting
1325 // the compilation. Native lookups can load code, which is not
1326 // permitted during compilation.
1327 //
1328 // Note: A native method implies non-osr compilation which is
1329 // checked with an assertion at the entry of this method.
1330 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1331 bool in_base_library;
1332 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1333 if (HAS_PENDING_EXCEPTION) {
1334 // In case of an exception looking up the method, we just forget
1335 // about it. The interpreter will kick-in and throw the exception.
1336 method->set_not_compilable(); // implies is_not_osr_compilable()
1337 CLEAR_PENDING_EXCEPTION;
1338 return NULL;
1339 }
1340 assert(method->has_native_function(), "must have native code by now");
1341 }
1342
1343 // RedefineClasses() has replaced this method; just return
1344 if (method->is_old()) {
1345 return NULL;
1346 }
1347
1348 // JVMTI -- post_compile_event requires jmethod_id() that may require
1349 // a lock the compiling thread can not acquire. Prefetch it here.
1350 if (JvmtiExport::should_post_compiled_method_load()) {
1351 method->jmethod_id();
1352 }
1353
1354 // do the compilation
1355 if (method->is_native()) {
1356 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1357 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1358 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1359 //
1360 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1361 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1362 AdapterHandlerLibrary::create_native_wrapper(method);
1363 } else {
1364 return NULL;
1365 }
1366 } else {
1367 // If the compiler is shut off due to code cache getting full
1368 // fail out now so blocking compiles dont hang the java thread
1369 if (!should_compile_new_jobs()) {
1370 CompilationPolicy::policy()->delay_compilation(method());
1371 return NULL;
1372 }
1373 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1374 }
1375
1376 // return requested nmethod
1377 // We accept a higher level osr method
1378 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1379 }
1380
1381
1382 // ------------------------------------------------------------------
1383 // CompileBroker::compilation_is_complete
1384 //
1385 // See if compilation of this method is already complete.
1386 bool CompileBroker::compilation_is_complete(methodHandle method,
1387 int osr_bci,
1388 int comp_level) {
1389 bool is_osr = (osr_bci != standard_entry_bci);
1390 if (is_osr) {
1391 if (method->is_not_osr_compilable(comp_level)) {
1392 return true;
1393 } else {
1394 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1395 return (result != NULL);
1396 }
1397 } else {
1398 if (method->is_not_compilable(comp_level)) {
1399 return true;
1400 } else {
1401 nmethod* result = method->code();
1402 if (result == NULL) return false;
1403 return comp_level == result->comp_level();
1404 }
1405 }
1406 }
1407
1408
1409 // ------------------------------------------------------------------
1410 // CompileBroker::compilation_is_in_queue
1411 //
1412 // See if this compilation is already requested.
1413 //
1414 // Implementation note: there is only a single "is in queue" bit
1415 // for each method. This means that the check below is overly
1416 // conservative in the sense that an osr compilation in the queue
1417 // will block a normal compilation from entering the queue (and vice
1418 // versa). This can be remedied by a full queue search to disambiguate
1419 // cases. If it is deemed profitible, this may be done.
1420 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1421 int osr_bci) {
1422 return method->queued_for_compilation();
1423 }
1424
1425 // ------------------------------------------------------------------
1426 // CompileBroker::compilation_is_prohibited
1427 //
1428 // See if this compilation is not allowed.
1429 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1430 bool is_native = method->is_native();
1431 // Some compilers may not support the compilation of natives.
1432 AbstractCompiler *comp = compiler(comp_level);
1433 if (is_native &&
1434 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1435 method->set_not_compilable_quietly(comp_level);
1436 return true;
1437 }
1438
1439 bool is_osr = (osr_bci != standard_entry_bci);
1440 // Some compilers may not support on stack replacement.
1441 if (is_osr &&
1442 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1443 method->set_not_osr_compilable(comp_level);
1444 return true;
1445 }
1446
1447 // The method may be explicitly excluded by the user.
1448 bool quietly;
1449 if (CompilerOracle::should_exclude(method, quietly)) {
1450 if (!quietly) {
1451 // This does not happen quietly...
1452 ResourceMark rm;
1453 tty->print("### Excluding %s:%s",
1454 method->is_native() ? "generation of native wrapper" : "compile",
1455 (method->is_static() ? " static" : ""));
1456 method->print_short_name(tty);
1457 tty->cr();
1458 }
1459 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1460 }
1461
1462 return false;
1463 }
1464
1465 /**
1466 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1467 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1468 * The function also allows to generate separate compilation IDs for OSR compilations.
1469 */
1470 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1471 #ifdef ASSERT
1472 bool is_osr = (osr_bci != standard_entry_bci);
1473 int id;
1474 if (method->is_native()) {
1475 assert(!is_osr, "can't be osr");
1476 // Adapters, native wrappers and method handle intrinsics
1477 // should be generated always.
1478 return Atomic::add(1, &_compilation_id);
1479 } else if (CICountOSR && is_osr) {
1480 id = Atomic::add(1, &_osr_compilation_id);
1481 if (CIStartOSR <= id && id < CIStopOSR) {
1482 return id;
1483 }
1484 } else {
1485 id = Atomic::add(1, &_compilation_id);
1486 if (CIStart <= id && id < CIStop) {
1487 return id;
1488 }
1489 }
1490
1491 // Method was not in the appropriate compilation range.
1492 method->set_not_compilable_quietly();
1493 return 0;
1494 #else
1495 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1496 // only _compilation_id is incremented.
1497 return Atomic::add(1, &_compilation_id);
1498 #endif
1499 }
1500
1501
1502 // ------------------------------------------------------------------
1503 // CompileBroker::is_compile_blocking
1504 //
1505 // Should the current thread be blocked until this compilation request
1506 // has been fulfilled?
1507 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1508 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1509 return !BackgroundCompilation;
1510 }
1511
1512
1513 // ------------------------------------------------------------------
1514 // CompileBroker::preload_classes
1515 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1516 // Move this code over from c1_Compiler.cpp
1517 ShouldNotReachHere();
1518 }
1519
1520
1521 // ------------------------------------------------------------------
1522 // CompileBroker::create_compile_task
1523 //
1524 // Create a CompileTask object representing the current request for
1525 // compilation. Add this task to the queue.
1526 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1527 int compile_id,
1528 methodHandle method,
1529 int osr_bci,
1530 int comp_level,
1531 methodHandle hot_method,
1532 int hot_count,
1533 const char* comment,
1534 bool blocking) {
1535 CompileTask* new_task = allocate_task();
1536 new_task->initialize(compile_id, method, osr_bci, comp_level,
1537 hot_method, hot_count, comment,
1538 blocking);
1539 queue->add(new_task);
1540 return new_task;
1541 }
1542
1543
1544 // ------------------------------------------------------------------
1545 // CompileBroker::allocate_task
1546 //
1547 // Allocate a CompileTask, from the free list if possible.
1548 CompileTask* CompileBroker::allocate_task() {
1549 MutexLocker locker(CompileTaskAlloc_lock);
1550 CompileTask* task = NULL;
1551 if (_task_free_list != NULL) {
1552 task = _task_free_list;
1553 _task_free_list = task->next();
1554 task->set_next(NULL);
1555 } else {
1556 task = new CompileTask();
1557 task->set_next(NULL);
1558 }
1559 return task;
1560 }
1561
1562
1563 // ------------------------------------------------------------------
1564 // CompileBroker::free_task
1565 //
1566 // Add a task to the free list.
1567 void CompileBroker::free_task(CompileTask* task) {
1568 MutexLocker locker(CompileTaskAlloc_lock);
1569 task->free();
1570 task->set_next(_task_free_list);
1571 _task_free_list = task;
1572 }
1573
1574
1575 // ------------------------------------------------------------------
1576 // CompileBroker::wait_for_completion
1577 //
1578 // Wait for the given method CompileTask to complete.
1579 void CompileBroker::wait_for_completion(CompileTask* task) {
1580 if (CIPrintCompileQueue) {
1581 tty->print_cr("BLOCKING FOR COMPILE");
1582 }
1583
1584 assert(task->is_blocking(), "can only wait on blocking task");
1585
1586 JavaThread *thread = JavaThread::current();
1587 thread->set_blocked_on_compilation(true);
1588
1589 methodHandle method(thread, task->method());
1590 {
1591 MutexLocker waiter(task->lock(), thread);
1592
1593 while (!task->is_complete())
1594 task->lock()->wait();
1595 }
1596 // It is harmless to check this status without the lock, because
1597 // completion is a stable property (until the task object is recycled).
1598 assert(task->is_complete(), "Compilation should have completed");
1599 assert(task->code_handle() == NULL, "must be reset");
1600
1601 thread->set_blocked_on_compilation(false);
1602
1603 // By convention, the waiter is responsible for recycling a
1604 // blocking CompileTask. Since there is only one waiter ever
1605 // waiting on a CompileTask, we know that no one else will
1606 // be using this CompileTask; we can free it.
1607 free_task(task);
1608 }
1609
1610 // Initialize compiler thread(s) + compiler object(s). The postcondition
1611 // of this function is that the compiler runtimes are initialized and that
1612 //compiler threads can start compiling.
1613 bool CompileBroker::init_compiler_runtime() {
1614 CompilerThread* thread = CompilerThread::current();
1615 AbstractCompiler* comp = thread->compiler();
1616 // Final sanity check - the compiler object must exist
1617 guarantee(comp != NULL, "Compiler object must exist");
1618
1619 int system_dictionary_modification_counter;
1620 {
1621 MutexLocker locker(Compile_lock, thread);
1622 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1623 }
1624
1625 {
1626 // Must switch to native to allocate ci_env
1627 ThreadToNativeFromVM ttn(thread);
1628 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1629 // Cache Jvmti state
1630 ci_env.cache_jvmti_state();
1631 // Cache DTrace flags
1632 ci_env.cache_dtrace_flags();
1633
1634 // Switch back to VM state to do compiler initialization
1635 ThreadInVMfromNative tv(thread);
1636 ResetNoHandleMark rnhm;
1637
1638
1639 if (!comp->is_shark()) {
1640 // Perform per-thread and global initializations
1641 comp->initialize();
1642 }
1643 }
1644
1645 if (comp->is_failed()) {
1646 disable_compilation_forever();
1647 // If compiler initialization failed, no compiler thread that is specific to a
1648 // particular compiler runtime will ever start to compile methods.
1649
1650 shutdown_compiler_runtime(comp, thread);
1651 return false;
1652 }
1653
1654 // C1 specific check
1655 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1656 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1657 return false;
1658 }
1659
1660 return true;
1661 }
1662
1663 // If C1 and/or C2 initialization failed, we shut down all compilation.
1664 // We do this to keep things simple. This can be changed if it ever turns out to be
1665 // a problem.
1666 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1667 // Free buffer blob, if allocated
1668 if (thread->get_buffer_blob() != NULL) {
1669 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1670 CodeCache::free(thread->get_buffer_blob());
1671 }
1672
1673 if (comp->should_perform_shutdown()) {
1674 // There are two reasons for shutting down the compiler
1675 // 1) compiler runtime initialization failed
1676 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1677 warning("Shutting down compiler %s (no space to run compilers)", comp->name());
1678
1679 // Only one thread per compiler runtime object enters here
1680 // Set state to shut down
1681 comp->set_shut_down();
1682
1683 MutexLocker mu(MethodCompileQueue_lock, thread);
1684 CompileQueue* queue;
1685 if (_c1_method_queue != NULL) {
1686 _c1_method_queue->delete_all();
1687 queue = _c1_method_queue;
1688 _c1_method_queue = NULL;
1689 delete _c1_method_queue;
1690 }
1691
1692 if (_c2_method_queue != NULL) {
1693 _c2_method_queue->delete_all();
1694 queue = _c2_method_queue;
1695 _c2_method_queue = NULL;
1696 delete _c2_method_queue;
1697 }
1698
1699 // We could delete compiler runtimes also. However, there are references to
1700 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1701 // fail. This can be done later if necessary.
1702 }
1703 }
1704
1705 // ------------------------------------------------------------------
1706 // CompileBroker::compiler_thread_loop
1707 //
1708 // The main loop run by a CompilerThread.
1709 void CompileBroker::compiler_thread_loop() {
1710 CompilerThread* thread = CompilerThread::current();
1711 CompileQueue* queue = thread->queue();
1712 // For the thread that initializes the ciObjectFactory
1713 // this resource mark holds all the shared objects
1714 ResourceMark rm;
1715
1716 // First thread to get here will initialize the compiler interface
1717
1718 if (!ciObjectFactory::is_initialized()) {
1719 ASSERT_IN_VM;
1720 MutexLocker only_one (CompileThread_lock, thread);
1721 if (!ciObjectFactory::is_initialized()) {
1722 ciObjectFactory::initialize();
1723 }
1724 }
1725
1726 // Open a log.
1727 if (LogCompilation) {
1728 init_compiler_thread_log();
1729 }
1730 CompileLog* log = thread->log();
1731 if (log != NULL) {
1732 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1733 thread->name(),
1734 os::current_thread_id(),
1735 os::current_process_id());
1736 log->stamp();
1737 log->end_elem();
1738 }
1739
1740 // If compiler thread/runtime initialization fails, exit the compiler thread
1741 if (!init_compiler_runtime()) {
1742 return;
1743 }
1744
1745 // Poll for new compilation tasks as long as the JVM runs. Compilation
1746 // should only be disabled if something went wrong while initializing the
1747 // compiler runtimes. This, in turn, should not happen. The only known case
1748 // when compiler runtime initialization fails is if there is not enough free
1749 // space in the code cache to generate the necessary stubs, etc.
1750 while (!is_compilation_disabled_forever()) {
1751 // We need this HandleMark to avoid leaking VM handles.
1752 HandleMark hm(thread);
1753
1754 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1755 // the code cache is really full
1756 handle_full_code_cache();
1757 }
1758
1759 CompileTask* task = queue->get();
1760 if (task == NULL) {
1761 continue;
1762 }
1763
1764 // Give compiler threads an extra quanta. They tend to be bursty and
1765 // this helps the compiler to finish up the job.
1766 if( CompilerThreadHintNoPreempt )
1767 os::hint_no_preempt();
1768
1769 // trace per thread time and compile statistics
1770 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1771 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1772
1773 // Assign the task to the current thread. Mark this compilation
1774 // thread as active for the profiler.
1775 CompileTaskWrapper ctw(task);
1776 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1777 task->set_code_handle(&result_handle);
1778 methodHandle method(thread, task->method());
1779
1780 // Never compile a method if breakpoints are present in it
1781 if (method()->number_of_breakpoints() == 0) {
1782 // Compile the method.
1783 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1784 #ifdef COMPILER1
1785 // Allow repeating compilations for the purpose of benchmarking
1786 // compile speed. This is not useful for customers.
1787 if (CompilationRepeat != 0) {
1788 int compile_count = CompilationRepeat;
1789 while (compile_count > 0) {
1790 invoke_compiler_on_method(task);
1791 nmethod* nm = method->code();
1792 if (nm != NULL) {
1793 nm->make_zombie();
1794 method->clear_code();
1795 }
1796 compile_count--;
1797 }
1798 }
1799 #endif /* COMPILER1 */
1800 invoke_compiler_on_method(task);
1801 } else {
1802 // After compilation is disabled, remove remaining methods from queue
1803 method->clear_queued_for_compilation();
1804 task->set_failure_reason("compilation is disabled");
1805 }
1806 }
1807 }
1808
1809 // Shut down compiler runtime
1810 shutdown_compiler_runtime(thread->compiler(), thread);
1811 }
1812
1813 // ------------------------------------------------------------------
1814 // CompileBroker::init_compiler_thread_log
1815 //
1816 // Set up state required by +LogCompilation.
1817 void CompileBroker::init_compiler_thread_log() {
1818 CompilerThread* thread = CompilerThread::current();
1819 char file_name[4*K];
1820 FILE* fp = NULL;
1821 intx thread_id = os::current_thread_id();
1822 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1823 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1824 if (dir == NULL) {
1825 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1826 thread_id, os::current_process_id());
1827 } else {
1828 jio_snprintf(file_name, sizeof(file_name),
1829 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1830 os::file_separator(), thread_id, os::current_process_id());
1831 }
1832
1833 fp = fopen(file_name, "at");
1834 if (fp != NULL) {
1835 if (LogCompilation && Verbose) {
1836 tty->print_cr("Opening compilation log %s", file_name);
1837 }
1838 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1839 thread->init_log(log);
1840
1841 if (xtty != NULL) {
1842 ttyLocker ttyl;
1843 // Record any per thread log files
1844 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1845 }
1846 return;
1847 }
1848 }
1849 warning("Cannot open log file: %s", file_name);
1850 }
1851
1852 // ------------------------------------------------------------------
1853 // CompileBroker::set_should_block
1854 //
1855 // Set _should_block.
1856 // Call this from the VM, with Threads_lock held and a safepoint requested.
1857 void CompileBroker::set_should_block() {
1858 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1859 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1860 #ifndef PRODUCT
1861 if (PrintCompilation && (Verbose || WizardMode))
1862 tty->print_cr("notifying compiler thread pool to block");
1863 #endif
1864 _should_block = true;
1865 }
1866
1867 // ------------------------------------------------------------------
1868 // CompileBroker::maybe_block
1869 //
1870 // Call this from the compiler at convenient points, to poll for _should_block.
1871 void CompileBroker::maybe_block() {
1872 if (_should_block) {
1873 #ifndef PRODUCT
1874 if (PrintCompilation && (Verbose || WizardMode))
1875 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1876 #endif
1877 ThreadInVMfromNative tivfn(JavaThread::current());
1878 }
1879 }
1880
1881 // wrapper for CodeCache::print_summary()
1882 static void codecache_print(bool detailed)
1883 {
1884 ResourceMark rm;
1885 stringStream s;
1886 // Dump code cache into a buffer before locking the tty,
1887 {
1888 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1889 CodeCache::print_summary(&s, detailed);
1890 }
1891 ttyLocker ttyl;
1892 tty->print("%s", s.as_string());
1893 }
1894
1895 // ------------------------------------------------------------------
1896 // CompileBroker::invoke_compiler_on_method
1897 //
1898 // Compile a method.
1899 //
1900 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1901 if (PrintCompilation) {
1902 ResourceMark rm;
1903 task->print_line();
1904 }
1905 elapsedTimer time;
1906
1907 CompilerThread* thread = CompilerThread::current();
1908 ResourceMark rm(thread);
1909
1910 if (LogEvents) {
1911 _compilation_log->log_compile(thread, task);
1912 }
1913
1914 // Common flags.
1915 uint compile_id = task->compile_id();
1916 int osr_bci = task->osr_bci();
1917 bool is_osr = (osr_bci != standard_entry_bci);
1918 bool should_log = (thread->log() != NULL);
1919 bool should_break = false;
1920 int task_level = task->comp_level();
1921 {
1922 // create the handle inside it's own block so it can't
1923 // accidentally be referenced once the thread transitions to
1924 // native. The NoHandleMark before the transition should catch
1925 // any cases where this occurs in the future.
1926 methodHandle method(thread, task->method());
1927 should_break = check_break_at(method, compile_id, is_osr);
1928 if (should_log && !CompilerOracle::should_log(method)) {
1929 should_log = false;
1930 }
1931 assert(!method->is_native(), "no longer compile natives");
1932
1933 // Save information about this method in case of failure.
1934 set_last_compile(thread, method, is_osr, task_level);
1935
1936 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1937 }
1938
1939 // Allocate a new set of JNI handles.
1940 push_jni_handle_block();
1941 Method* target_handle = task->method();
1942 int compilable = ciEnv::MethodCompilable;
1943 {
1944 int system_dictionary_modification_counter;
1945 {
1946 MutexLocker locker(Compile_lock, thread);
1947 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1948 }
1949
1950 NoHandleMark nhm;
1951 ThreadToNativeFromVM ttn(thread);
1952
1953 ciEnv ci_env(task, system_dictionary_modification_counter);
1954 if (should_break) {
1955 ci_env.set_break_at_compile(true);
1956 }
1957 if (should_log) {
1958 ci_env.set_log(thread->log());
1959 }
1960 assert(thread->env() == &ci_env, "set by ci_env");
1961 // The thread-env() field is cleared in ~CompileTaskWrapper.
1962
1963 // Cache Jvmti state
1964 ci_env.cache_jvmti_state();
1965
1966 // Cache DTrace flags
1967 ci_env.cache_dtrace_flags();
1968
1969 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1970
1971 TraceTime t1("compilation", &time);
1972 EventCompilation event;
1973
1974 AbstractCompiler *comp = compiler(task_level);
1975 if (comp == NULL) {
1976 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1977 } else {
1978 comp->compile_method(&ci_env, target, osr_bci);
1979 }
1980
1981 if (!ci_env.failing() && task->code() == NULL) {
1982 //assert(false, "compiler should always document failure");
1983 // The compiler elected, without comment, not to register a result.
1984 // Do not attempt further compilations of this method.
1985 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1986 }
1987
1988 // Copy this bit to the enclosing block:
1989 compilable = ci_env.compilable();
1990
1991 if (ci_env.failing()) {
1992 task->set_failure_reason(ci_env.failure_reason());
1993 const char* retry_message = ci_env.retry_message();
1994 if (_compilation_log != NULL) {
1995 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1996 }
1997 if (PrintCompilation) {
1998 FormatBufferResource msg = retry_message != NULL ?
1999 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2000 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2001 task->print_compilation(tty, msg);
2002 }
2003 } else {
2004 task->mark_success();
2005 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2006 if (_compilation_log != NULL) {
2007 nmethod* code = task->code();
2008 if (code != NULL) {
2009 _compilation_log->log_nmethod(thread, code);
2010 }
2011 }
2012 }
2013 // simulate crash during compilation
2014 assert(task->compile_id() != CICrashAt, "just as planned");
2015 if (event.should_commit()) {
2016 event.set_method(target->get_Method());
2017 event.set_compileID(compile_id);
2018 event.set_compileLevel(task->comp_level());
2019 event.set_succeded(task->is_success());
2020 event.set_isOsr(is_osr);
2021 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2022 event.set_inlinedBytes(task->num_inlined_bytecodes());
2023 event.commit();
2024 }
2025 }
2026 pop_jni_handle_block();
2027
2028 methodHandle method(thread, task->method());
2029
2030 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2031
2032 collect_statistics(thread, time, task);
2033
2034 if (PrintCompilation && PrintCompilation2) {
2035 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2036 tty->print("%4d ", compile_id); // print compilation number
2037 tty->print("%s ", (is_osr ? "%" : " "));
2038 if (task->code() != NULL) {
2039 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2040 }
2041 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2042 }
2043
2044 if (PrintCodeCacheOnCompilation)
2045 codecache_print(/* detailed= */ false);
2046
2047 // Disable compilation, if required.
2048 switch (compilable) {
2049 case ciEnv::MethodCompilable_never:
2050 if (is_osr)
2051 method->set_not_osr_compilable_quietly();
2052 else
2053 method->set_not_compilable_quietly();
2054 break;
2055 case ciEnv::MethodCompilable_not_at_tier:
2056 if (is_osr)
2057 method->set_not_osr_compilable_quietly(task_level);
2058 else
2059 method->set_not_compilable_quietly(task_level);
2060 break;
2061 }
2062
2063 // Note that the queued_for_compilation bits are cleared without
2064 // protection of a mutex. [They were set by the requester thread,
2065 // when adding the task to the compile queue -- at which time the
2066 // compile queue lock was held. Subsequently, we acquired the compile
2067 // queue lock to get this task off the compile queue; thus (to belabour
2068 // the point somewhat) our clearing of the bits must be occurring
2069 // only after the setting of the bits. See also 14012000 above.
2070 method->clear_queued_for_compilation();
2071
2072 #ifdef ASSERT
2073 if (CollectedHeap::fired_fake_oom()) {
2074 // The current compile received a fake OOM during compilation so
2075 // go ahead and exit the VM since the test apparently succeeded
2076 tty->print_cr("*** Shutting down VM after successful fake OOM");
2077 vm_exit(0);
2078 }
2079 #endif
2080 }
2081
2082 /**
2083 * The CodeCache is full. Print out warning and disable compilation
2084 * or try code cache cleaning so compilation can continue later.
2085 */
2086 void CompileBroker::handle_full_code_cache() {
2087 UseInterpreter = true;
2088 if (UseCompiler || AlwaysCompileLoopMethods ) {
2089 if (xtty != NULL) {
2090 ResourceMark rm;
2091 stringStream s;
2092 // Dump code cache state into a buffer before locking the tty,
2093 // because log_state() will use locks causing lock conflicts.
2094 CodeCache::log_state(&s);
2095 // Lock to prevent tearing
2096 ttyLocker ttyl;
2097 xtty->begin_elem("code_cache_full");
2098 xtty->print("%s", s.as_string());
2099 xtty->stamp();
2100 xtty->end_elem();
2101 }
2102
2103 CodeCache::report_codemem_full();
2104
2105 #ifndef PRODUCT
2106 if (CompileTheWorld || ExitOnFullCodeCache) {
2107 codecache_print(/* detailed= */ true);
2108 before_exit(JavaThread::current());
2109 exit_globals(); // will delete tty
2110 vm_direct_exit(CompileTheWorld ? 0 : 1);
2111 }
2112 #endif
2113 if (UseCodeCacheFlushing) {
2114 // Since code cache is full, immediately stop new compiles
2115 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2116 NMethodSweeper::log_sweep("disable_compiler");
2117 }
2118 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2119 // without having to consider the state in which the current thread is.
2120 ThreadInVMfromUnknown in_vm;
2121 NMethodSweeper::possibly_sweep();
2122 } else {
2123 disable_compilation_forever();
2124 }
2125
2126 // Print warning only once
2127 if (should_print_compiler_warning()) {
2128 warning("CodeCache is full. Compiler has been disabled.");
2129 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2130 codecache_print(/* detailed= */ true);
2131 }
2132 }
2133 }
2134
2135 // ------------------------------------------------------------------
2136 // CompileBroker::set_last_compile
2137 //
2138 // Record this compilation for debugging purposes.
2139 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2140 ResourceMark rm;
2141 char* method_name = method->name()->as_C_string();
2142 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2143 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2144 char current_method[CompilerCounters::cmname_buffer_length];
2145 size_t maxLen = CompilerCounters::cmname_buffer_length;
2146
2147 if (UsePerfData) {
2148 const char* class_name = method->method_holder()->name()->as_C_string();
2149
2150 size_t s1len = strlen(class_name);
2151 size_t s2len = strlen(method_name);
2152
2153 // check if we need to truncate the string
2154 if (s1len + s2len + 2 > maxLen) {
2155
2156 // the strategy is to lop off the leading characters of the
2157 // class name and the trailing characters of the method name.
2158
2159 if (s2len + 2 > maxLen) {
2160 // lop of the entire class name string, let snprintf handle
2161 // truncation of the method name.
2162 class_name += s1len; // null string
2163 }
2164 else {
2165 // lop off the extra characters from the front of the class name
2166 class_name += ((s1len + s2len + 2) - maxLen);
2167 }
2168 }
2169
2170 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2171 }
2172
2173 if (CICountOSR && is_osr) {
2174 _last_compile_type = osr_compile;
2175 } else {
2176 _last_compile_type = normal_compile;
2177 }
2178 _last_compile_level = comp_level;
2179
2180 if (UsePerfData) {
2181 CompilerCounters* counters = thread->counters();
2182 counters->set_current_method(current_method);
2183 counters->set_compile_type((jlong)_last_compile_type);
2184 }
2185 }
2186
2187
2188 // ------------------------------------------------------------------
2189 // CompileBroker::push_jni_handle_block
2190 //
2191 // Push on a new block of JNI handles.
2192 void CompileBroker::push_jni_handle_block() {
2193 JavaThread* thread = JavaThread::current();
2194
2195 // Allocate a new block for JNI handles.
2196 // Inlined code from jni_PushLocalFrame()
2197 JNIHandleBlock* java_handles = thread->active_handles();
2198 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2199 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2200 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2201 thread->set_active_handles(compile_handles);
2202 }
2203
2204
2205 // ------------------------------------------------------------------
2206 // CompileBroker::pop_jni_handle_block
2207 //
2208 // Pop off the current block of JNI handles.
2209 void CompileBroker::pop_jni_handle_block() {
2210 JavaThread* thread = JavaThread::current();
2211
2212 // Release our JNI handle block
2213 JNIHandleBlock* compile_handles = thread->active_handles();
2214 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2215 thread->set_active_handles(java_handles);
2216 compile_handles->set_pop_frame_link(NULL);
2217 JNIHandleBlock::release_block(compile_handles, thread); // may block
2218 }
2219
2220
2221 // ------------------------------------------------------------------
2222 // CompileBroker::check_break_at
2223 //
2224 // Should the compilation break at the current compilation.
2225 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2226 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2227 return true;
2228 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2229 return true;
2230 } else {
2231 return (compile_id == CIBreakAt);
2232 }
2233 }
2234
2235 // ------------------------------------------------------------------
2236 // CompileBroker::collect_statistics
2237 //
2238 // Collect statistics about the compilation.
2239
2240 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2241 bool success = task->is_success();
2242 methodHandle method (thread, task->method());
2243 uint compile_id = task->compile_id();
2244 bool is_osr = (task->osr_bci() != standard_entry_bci);
2245 nmethod* code = task->code();
2246 CompilerCounters* counters = thread->counters();
2247
2248 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2249 MutexLocker locker(CompileStatistics_lock);
2250
2251 // _perf variables are production performance counters which are
2252 // updated regardless of the setting of the CITime and CITimeEach flags
2253 //
2254 if (!success) {
2255 _total_bailout_count++;
2256 if (UsePerfData) {
2257 _perf_last_failed_method->set_value(counters->current_method());
2258 _perf_last_failed_type->set_value(counters->compile_type());
2259 _perf_total_bailout_count->inc();
2260 }
2261 } else if (code == NULL) {
2262 if (UsePerfData) {
2263 _perf_last_invalidated_method->set_value(counters->current_method());
2264 _perf_last_invalidated_type->set_value(counters->compile_type());
2265 _perf_total_invalidated_count->inc();
2266 }
2267 _total_invalidated_count++;
2268 } else {
2269 // Compilation succeeded
2270
2271 // update compilation ticks - used by the implementation of
2272 // java.lang.management.CompilationMBean
2273 _perf_total_compilation->inc(time.ticks());
2274
2275 _t_total_compilation.add(time);
2276 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2277
2278 if (CITime) {
2279 if (is_osr) {
2280 _t_osr_compilation.add(time);
2281 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2282 } else {
2283 _t_standard_compilation.add(time);
2284 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2285 }
2286 }
2287
2288 if (UsePerfData) {
2289 // save the name of the last method compiled
2290 _perf_last_method->set_value(counters->current_method());
2291 _perf_last_compile_type->set_value(counters->compile_type());
2292 _perf_last_compile_size->set_value(method->code_size() +
2293 task->num_inlined_bytecodes());
2294 if (is_osr) {
2295 _perf_osr_compilation->inc(time.ticks());
2296 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2297 } else {
2298 _perf_standard_compilation->inc(time.ticks());
2299 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2300 }
2301 }
2302
2303 if (CITimeEach) {
2304 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2305 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2306 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2307 }
2308
2309 // Collect counts of successful compilations
2310 _sum_nmethod_size += code->total_size();
2311 _sum_nmethod_code_size += code->insts_size();
2312 _total_compile_count++;
2313
2314 if (UsePerfData) {
2315 _perf_sum_nmethod_size->inc( code->total_size());
2316 _perf_sum_nmethod_code_size->inc(code->insts_size());
2317 _perf_total_compile_count->inc();
2318 }
2319
2320 if (is_osr) {
2321 if (UsePerfData) _perf_total_osr_compile_count->inc();
2322 _total_osr_compile_count++;
2323 } else {
2324 if (UsePerfData) _perf_total_standard_compile_count->inc();
2325 _total_standard_compile_count++;
2326 }
2327 }
2328 // set the current method for the thread to null
2329 if (UsePerfData) counters->set_current_method("");
2330 }
2331
2332 const char* CompileBroker::compiler_name(int comp_level) {
2333 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2334 if (comp == NULL) {
2335 return "no compiler";
2336 } else {
2337 return (comp->name());
2338 }
2339 }
2340
2341 void CompileBroker::print_times() {
2342 tty->cr();
2343 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2344 tty->print_cr("------------------------------------------------");
2345 //0000000000111111111122222222223333333333444444444455555555556666666666
2346 //0123456789012345678901234567890123456789012345678901234567890123456789
2347 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2348 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2349 CompileBroker::_t_standard_compilation.seconds(),
2350 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2351 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);
2352
2353 AbstractCompiler *comp = compiler(CompLevel_simple);
2354 if (comp != NULL) {
2355 comp->print_timers();
2356 }
2357 comp = compiler(CompLevel_full_optimization);
2358 if (comp != NULL) {
2359 comp->print_timers();
2360 }
2361 tty->cr();
2362 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2363 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2364 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2365 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2366 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2367 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2368 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2369 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2370 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2371 tty->cr();
2372 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2373 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2374 }
2375
2376 // Debugging output for failure
2377 void CompileBroker::print_last_compile() {
2378 if ( _last_compile_level != CompLevel_none &&
2379 compiler(_last_compile_level) != NULL &&
2380 _last_method_compiled != NULL &&
2381 _last_compile_type != no_compile) {
2382 if (_last_compile_type == osr_compile) {
2383 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2384 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2385 } else {
2386 tty->print_cr("Last parse: %d+++(%d) %s",
2387 _compilation_id, _last_compile_level, _last_method_compiled);
2388 }
2389 }
2390 }
2391
2392
2393 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2394 #ifndef PRODUCT
2395 st->print_cr("Compiler thread printing unimplemented.");
2396 st->cr();
2397 #endif
2398 }
--- EOF ---