Tue, 06 May 2014 09:52:38 +0200
8042428: CompileQueue::free_all() code is incorrect
Summary: Free task after getting next pointer of freelist.
Reviewed-by: kvn, adlertz
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 */
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
59 #ifdef DTRACE_ENABLED
61 // Only bother with this argument setup if dtrace is available
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);
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 }
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 }
93 #else /* USDT2 */
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 }
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 */
120 #else // ndef DTRACE_ENABLED
122 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
123 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
125 #endif // ndef DTRACE_ENABLED
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;
132 // The installed compiler(s)
133 AbstractCompiler* CompileBroker::_compilers[2];
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;
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];
144 // Performance counters
145 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
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;
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;
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;
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;
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;
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;
184 long CompileBroker::_peak_compilation_time = 0;
186 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
187 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
189 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
192 class CompilationLog : public StringEventLog {
193 public:
194 CompilationLog() : StringEventLog("Compilation events") {
195 }
197 void log_compile(JavaThread* thread, CompileTask* task) {
198 StringLogMessage lm;
199 stringStream sstr = lm.stream();
200 // msg.time_stamp().update_to(tty->time_stamp().ticks());
201 task->print_compilation(&sstr, NULL, true);
202 log(thread, "%s", (const char*)lm);
203 }
205 void log_nmethod(JavaThread* thread, nmethod* nm) {
206 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
207 nm->compile_id(), nm->is_osr_method() ? "%" : "",
208 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
209 }
211 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
212 StringLogMessage lm;
213 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
214 if (retry_message != NULL) {
215 lm.append(" (%s)", retry_message);
216 }
217 lm.print("\n");
218 log(thread, "%s", (const char*)lm);
219 }
220 };
222 static CompilationLog* _compilation_log = NULL;
224 void compileBroker_init() {
225 if (LogEvents) {
226 _compilation_log = new CompilationLog();
227 }
228 }
230 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
231 CompilerThread* thread = CompilerThread::current();
232 thread->set_task(task);
233 CompileLog* log = thread->log();
234 if (log != NULL) task->log_task_start(log);
235 }
237 CompileTaskWrapper::~CompileTaskWrapper() {
238 CompilerThread* thread = CompilerThread::current();
239 CompileTask* task = thread->task();
240 CompileLog* log = thread->log();
241 if (log != NULL) task->log_task_done(log);
242 thread->set_task(NULL);
243 task->set_code_handle(NULL);
244 thread->set_env(NULL);
245 if (task->is_blocking()) {
246 MutexLocker notifier(task->lock(), thread);
247 task->mark_complete();
248 // Notify the waiting thread that the compilation has completed.
249 task->lock()->notify_all();
250 } else {
251 task->mark_complete();
253 // By convention, the compiling thread is responsible for
254 // recycling a non-blocking CompileTask.
255 CompileTask::free(task);
256 }
257 }
260 CompileTask* CompileTask::_task_free_list = NULL;
261 #ifdef ASSERT
262 int CompileTask::_num_allocated_tasks = 0;
263 #endif
264 /**
265 * Allocate a CompileTask, from the free list if possible.
266 */
267 CompileTask* CompileTask::allocate() {
268 MutexLocker locker(CompileTaskAlloc_lock);
269 CompileTask* task = NULL;
271 if (_task_free_list != NULL) {
272 task = _task_free_list;
273 _task_free_list = task->next();
274 task->set_next(NULL);
275 } else {
276 task = new CompileTask();
277 DEBUG_ONLY(_num_allocated_tasks++;)
278 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
279 task->set_next(NULL);
280 task->set_is_free(true);
281 }
282 assert(task->is_free(), "Task must be free.");
283 task->set_is_free(false);
284 return task;
285 }
288 /**
289 * Add a task to the free list.
290 */
291 void CompileTask::free(CompileTask* task) {
292 MutexLocker locker(CompileTaskAlloc_lock);
293 if (!task->is_free()) {
294 task->set_code(NULL);
295 assert(!task->lock()->is_locked(), "Should not be locked when freed");
296 JNIHandles::destroy_global(task->_method_holder);
297 JNIHandles::destroy_global(task->_hot_method_holder);
299 task->set_is_free(true);
300 task->set_next(_task_free_list);
301 _task_free_list = task;
302 }
303 }
305 void CompileTask::initialize(int compile_id,
306 methodHandle method,
307 int osr_bci,
308 int comp_level,
309 methodHandle hot_method,
310 int hot_count,
311 const char* comment,
312 bool is_blocking) {
313 assert(!_lock->is_locked(), "bad locking");
315 _compile_id = compile_id;
316 _method = method();
317 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
318 _osr_bci = osr_bci;
319 _is_blocking = is_blocking;
320 _comp_level = comp_level;
321 _num_inlined_bytecodes = 0;
323 _is_complete = false;
324 _is_success = false;
325 _code_handle = NULL;
327 _hot_method = NULL;
328 _hot_method_holder = NULL;
329 _hot_count = hot_count;
330 _time_queued = 0; // tidy
331 _comment = comment;
332 _failure_reason = NULL;
334 if (LogCompilation) {
335 _time_queued = os::elapsed_counter();
336 if (hot_method.not_null()) {
337 if (hot_method == method) {
338 _hot_method = _method;
339 } else {
340 _hot_method = hot_method();
341 // only add loader or mirror if different from _method_holder
342 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
343 }
344 }
345 }
347 _next = NULL;
348 }
350 // ------------------------------------------------------------------
351 // CompileTask::code/set_code
352 nmethod* CompileTask::code() const {
353 if (_code_handle == NULL) return NULL;
354 return _code_handle->code();
355 }
356 void CompileTask::set_code(nmethod* nm) {
357 if (_code_handle == NULL && nm == NULL) return;
358 guarantee(_code_handle != NULL, "");
359 _code_handle->set_code(nm);
360 if (nm == NULL) _code_handle = NULL; // drop the handle also
361 }
364 void CompileTask::mark_on_stack() {
365 // Mark these methods as something redefine classes cannot remove.
366 _method->set_on_stack(true);
367 if (_hot_method != NULL) {
368 _hot_method->set_on_stack(true);
369 }
370 }
372 // ------------------------------------------------------------------
373 // CompileTask::print
374 void CompileTask::print() {
375 tty->print("<CompileTask compile_id=%d ", _compile_id);
376 tty->print("method=");
377 _method->print_name(tty);
378 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
379 _osr_bci, bool_to_str(_is_blocking),
380 bool_to_str(_is_complete), bool_to_str(_is_success));
381 }
384 // ------------------------------------------------------------------
385 // CompileTask::print_line_on_error
386 //
387 // This function is called by fatal error handler when the thread
388 // causing troubles is a compiler thread.
389 //
390 // Do not grab any lock, do not allocate memory.
391 //
392 // Otherwise it's the same as CompileTask::print_line()
393 //
394 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
395 // print compiler name
396 st->print("%s:", CompileBroker::compiler_name(comp_level()));
397 print_compilation(st);
398 }
400 // ------------------------------------------------------------------
401 // CompileTask::print_line
402 void CompileTask::print_line() {
403 ttyLocker ttyl; // keep the following output all in one block
404 // print compiler name if requested
405 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
406 print_compilation();
407 }
410 // ------------------------------------------------------------------
411 // CompileTask::print_compilation_impl
412 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
413 bool is_osr_method, int osr_bci, bool is_blocking,
414 const char* msg, bool short_form) {
415 if (!short_form) {
416 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
417 }
418 st->print("%4d ", compile_id); // print compilation number
420 // For unloaded methods the transition to zombie occurs after the
421 // method is cleared so it's impossible to report accurate
422 // information for that case.
423 bool is_synchronized = false;
424 bool has_exception_handler = false;
425 bool is_native = false;
426 if (method != NULL) {
427 is_synchronized = method->is_synchronized();
428 has_exception_handler = method->has_exception_handler();
429 is_native = method->is_native();
430 }
431 // method attributes
432 const char compile_type = is_osr_method ? '%' : ' ';
433 const char sync_char = is_synchronized ? 's' : ' ';
434 const char exception_char = has_exception_handler ? '!' : ' ';
435 const char blocking_char = is_blocking ? 'b' : ' ';
436 const char native_char = is_native ? 'n' : ' ';
438 // print method attributes
439 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
441 if (TieredCompilation) {
442 if (comp_level != -1) st->print("%d ", comp_level);
443 else st->print("- ");
444 }
445 st->print(" "); // more indent
447 if (method == NULL) {
448 st->print("(method)");
449 } else {
450 method->print_short_name(st);
451 if (is_osr_method) {
452 st->print(" @ %d", osr_bci);
453 }
454 if (method->is_native())
455 st->print(" (native)");
456 else
457 st->print(" (%d bytes)", method->code_size());
458 }
460 if (msg != NULL) {
461 st->print(" %s", msg);
462 }
463 if (!short_form) {
464 st->cr();
465 }
466 }
468 // ------------------------------------------------------------------
469 // CompileTask::print_inlining
470 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
471 // 1234567
472 st->print(" "); // print timestamp
473 // 1234
474 st->print(" "); // print compilation number
476 // method attributes
477 if (method->is_loaded()) {
478 const char sync_char = method->is_synchronized() ? 's' : ' ';
479 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
480 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
482 // print method attributes
483 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
484 } else {
485 // %s!bn
486 st->print(" "); // print method attributes
487 }
489 if (TieredCompilation) {
490 st->print(" ");
491 }
492 st->print(" "); // more indent
493 st->print(" "); // initial inlining indent
495 for (int i = 0; i < inline_level; i++) st->print(" ");
497 st->print("@ %d ", bci); // print bci
498 method->print_short_name(st);
499 if (method->is_loaded())
500 st->print(" (%d bytes)", method->code_size());
501 else
502 st->print(" (not loaded)");
504 if (msg != NULL) {
505 st->print(" %s", msg);
506 }
507 st->cr();
508 }
510 // ------------------------------------------------------------------
511 // CompileTask::print_inline_indent
512 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
513 // 1234567
514 st->print(" "); // print timestamp
515 // 1234
516 st->print(" "); // print compilation number
517 // %s!bn
518 st->print(" "); // print method attributes
519 if (TieredCompilation) {
520 st->print(" ");
521 }
522 st->print(" "); // more indent
523 st->print(" "); // initial inlining indent
524 for (int i = 0; i < inline_level; i++) st->print(" ");
525 }
527 // ------------------------------------------------------------------
528 // CompileTask::print_compilation
529 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
530 bool is_osr_method = osr_bci() != InvocationEntryBci;
531 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
532 }
534 // ------------------------------------------------------------------
535 // CompileTask::log_task
536 void CompileTask::log_task(xmlStream* log) {
537 Thread* thread = Thread::current();
538 methodHandle method(thread, this->method());
539 ResourceMark rm(thread);
541 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
542 log->print(" compile_id='%d'", _compile_id);
543 if (_osr_bci != CompileBroker::standard_entry_bci) {
544 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
545 } // else compile_kind='c2c'
546 if (!method.is_null()) log->method(method);
547 if (_osr_bci != CompileBroker::standard_entry_bci) {
548 log->print(" osr_bci='%d'", _osr_bci);
549 }
550 if (_comp_level != CompLevel_highest_tier) {
551 log->print(" level='%d'", _comp_level);
552 }
553 if (_is_blocking) {
554 log->print(" blocking='1'");
555 }
556 log->stamp();
557 }
560 // ------------------------------------------------------------------
561 // CompileTask::log_task_queued
562 void CompileTask::log_task_queued() {
563 Thread* thread = Thread::current();
564 ttyLocker ttyl;
565 ResourceMark rm(thread);
567 xtty->begin_elem("task_queued");
568 log_task(xtty);
569 if (_comment != NULL) {
570 xtty->print(" comment='%s'", _comment);
571 }
572 if (_hot_method != NULL) {
573 methodHandle hot(thread, _hot_method);
574 methodHandle method(thread, _method);
575 if (hot() != method()) {
576 xtty->method(hot);
577 }
578 }
579 if (_hot_count != 0) {
580 xtty->print(" hot_count='%d'", _hot_count);
581 }
582 xtty->end_elem();
583 }
586 // ------------------------------------------------------------------
587 // CompileTask::log_task_start
588 void CompileTask::log_task_start(CompileLog* log) {
589 log->begin_head("task");
590 log_task(log);
591 log->end_head();
592 }
595 // ------------------------------------------------------------------
596 // CompileTask::log_task_done
597 void CompileTask::log_task_done(CompileLog* log) {
598 Thread* thread = Thread::current();
599 methodHandle method(thread, this->method());
600 ResourceMark rm(thread);
602 if (!_is_success) {
603 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
604 log->elem("failure reason='%s'", reason);
605 }
607 // <task_done ... stamp='1.234'> </task>
608 nmethod* nm = code();
609 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
610 _is_success, nm == NULL ? 0 : nm->content_size(),
611 method->invocation_count());
612 int bec = method->backedge_count();
613 if (bec != 0) log->print(" backedge_count='%d'", bec);
614 // Note: "_is_complete" is about to be set, but is not.
615 if (_num_inlined_bytecodes != 0) {
616 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
617 }
618 log->stamp();
619 log->end_elem();
620 log->tail("task");
621 log->clear_identities(); // next task will have different CI
622 if (log->unflushed_count() > 2000) {
623 log->flush();
624 }
625 log->mark_file_end();
626 }
630 /**
631 * Add a CompileTask to a CompileQueue
632 */
633 void CompileQueue::add(CompileTask* task) {
634 assert(lock()->owned_by_self(), "must own lock");
635 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
637 task->set_next(NULL);
638 task->set_prev(NULL);
640 if (_last == NULL) {
641 // The compile queue is empty.
642 assert(_first == NULL, "queue is empty");
643 _first = task;
644 _last = task;
645 } else {
646 // Append the task to the queue.
647 assert(_last->next() == NULL, "not last");
648 _last->set_next(task);
649 task->set_prev(_last);
650 _last = task;
651 }
652 ++_size;
654 // Mark the method as being in the compile queue.
655 task->method()->set_queued_for_compilation();
657 NOT_PRODUCT(print();)
659 if (LogCompilation && xtty != NULL) {
660 task->log_task_queued();
661 }
663 // Notify CompilerThreads that a task is available.
664 lock()->notify_all();
665 }
667 /**
668 * Empties compilation queue by putting all compilation tasks onto
669 * a freelist. Furthermore, the method wakes up all threads that are
670 * waiting on a compilation task to finish. This can happen if background
671 * compilation is disabled.
672 */
673 void CompileQueue::free_all() {
674 MutexLocker mu(lock());
675 CompileTask* next = _first;
677 // Iterate over all tasks in the compile queue
678 while (next != NULL) {
679 CompileTask* current = next;
680 next = current->next();
681 // Wake up thread that blocks on the compile task.
682 current->lock()->notify();
683 // Put the task back on the freelist.
684 CompileTask::free(current);
685 }
686 _first = NULL;
688 // Wake up all threads that block on the queue.
689 lock()->notify_all();
690 }
692 // ------------------------------------------------------------------
693 // CompileQueue::get
694 //
695 // Get the next CompileTask from a CompileQueue
696 CompileTask* CompileQueue::get() {
697 NMethodSweeper::possibly_sweep();
699 MutexLocker locker(lock());
700 // If _first is NULL we have no more compile jobs. There are two reasons for
701 // having no compile jobs: First, we compiled everything we wanted. Second,
702 // we ran out of code cache so compilation has been disabled. In the latter
703 // case we perform code cache sweeps to free memory such that we can re-enable
704 // compilation.
705 while (_first == NULL) {
706 // Exit loop if compilation is disabled forever
707 if (CompileBroker::is_compilation_disabled_forever()) {
708 return NULL;
709 }
711 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
712 // Wait a certain amount of time to possibly do another sweep.
713 // We must wait until stack scanning has happened so that we can
714 // transition a method's state from 'not_entrant' to 'zombie'.
715 long wait_time = NmethodSweepCheckInterval * 1000;
716 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
717 // Only one thread at a time can do sweeping. Scale the
718 // wait time according to the number of compiler threads.
719 // As a result, the next sweep is likely to happen every 100ms
720 // with an arbitrary number of threads that do sweeping.
721 wait_time = 100 * CICompilerCount;
722 }
723 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
724 if (timeout) {
725 MutexUnlocker ul(lock());
726 NMethodSweeper::possibly_sweep();
727 }
728 } else {
729 // If there are no compilation tasks and we can compile new jobs
730 // (i.e., there is enough free space in the code cache) there is
731 // no need to invoke the sweeper. As a result, the hotness of methods
732 // remains unchanged. This behavior is desired, since we want to keep
733 // the stable state, i.e., we do not want to evict methods from the
734 // code cache if it is unnecessary.
735 // We need a timed wait here, since compiler threads can exit if compilation
736 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
737 // is not critical and we do not want idle compiler threads to wake up too often.
738 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
739 }
740 }
742 if (CompileBroker::is_compilation_disabled_forever()) {
743 return NULL;
744 }
746 CompileTask* task;
747 {
748 No_Safepoint_Verifier nsv;
749 task = CompilationPolicy::policy()->select_task(this);
750 }
751 remove(task);
752 purge_stale_tasks(); // may temporarily release MCQ lock
753 return task;
754 }
756 // Clean & deallocate stale compile tasks.
757 // Temporarily releases MethodCompileQueue lock.
758 void CompileQueue::purge_stale_tasks() {
759 assert(lock()->owned_by_self(), "must own lock");
760 if (_first_stale != NULL) {
761 // Stale tasks are purged when MCQ lock is released,
762 // but _first_stale updates are protected by MCQ lock.
763 // Once task processing starts and MCQ lock is released,
764 // other compiler threads can reuse _first_stale.
765 CompileTask* head = _first_stale;
766 _first_stale = NULL;
767 {
768 MutexUnlocker ul(lock());
769 for (CompileTask* task = head; task != NULL; ) {
770 CompileTask* next_task = task->next();
771 CompileTaskWrapper ctw(task); // Frees the task
772 task->set_failure_reason("stale task");
773 task = next_task;
774 }
775 }
776 }
777 }
779 void CompileQueue::remove(CompileTask* task) {
780 assert(lock()->owned_by_self(), "must own lock");
781 if (task->prev() != NULL) {
782 task->prev()->set_next(task->next());
783 } else {
784 // max is the first element
785 assert(task == _first, "Sanity");
786 _first = task->next();
787 }
789 if (task->next() != NULL) {
790 task->next()->set_prev(task->prev());
791 } else {
792 // max is the last element
793 assert(task == _last, "Sanity");
794 _last = task->prev();
795 }
796 --_size;
797 }
799 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
800 assert(lock()->owned_by_self(), "must own lock");
801 remove(task);
803 // Enqueue the task for reclamation (should be done outside MCQ lock)
804 task->set_next(_first_stale);
805 task->set_prev(NULL);
806 _first_stale = task;
807 }
809 // methods in the compile queue need to be marked as used on the stack
810 // so that they don't get reclaimed by Redefine Classes
811 void CompileQueue::mark_on_stack() {
812 CompileTask* task = _first;
813 while (task != NULL) {
814 task->mark_on_stack();
815 task = task->next();
816 }
817 }
819 #ifndef PRODUCT
820 /**
821 * Print entire compilation queue.
822 */
823 void CompileQueue::print() {
824 if (CIPrintCompileQueue) {
825 ttyLocker ttyl;
826 tty->print_cr("Contents of %s", name());
827 tty->print_cr("----------------------");
828 CompileTask* task = _first;
829 while (task != NULL) {
830 task->print_line();
831 task = task->next();
832 }
833 tty->print_cr("----------------------");
834 }
835 }
836 #endif // PRODUCT
838 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
840 _current_method[0] = '\0';
841 _compile_type = CompileBroker::no_compile;
843 if (UsePerfData) {
844 ResourceMark rm;
846 // create the thread instance name space string - don't create an
847 // instance subspace if instance is -1 - keeps the adapterThread
848 // counters from having a ".0" namespace.
849 const char* thread_i = (instance == -1) ? thread_name :
850 PerfDataManager::name_space(thread_name, instance);
853 char* name = PerfDataManager::counter_name(thread_i, "method");
854 _perf_current_method =
855 PerfDataManager::create_string_variable(SUN_CI, name,
856 cmname_buffer_length,
857 _current_method, CHECK);
859 name = PerfDataManager::counter_name(thread_i, "type");
860 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
861 PerfData::U_None,
862 (jlong)_compile_type,
863 CHECK);
865 name = PerfDataManager::counter_name(thread_i, "time");
866 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
867 PerfData::U_Ticks, CHECK);
869 name = PerfDataManager::counter_name(thread_i, "compiles");
870 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
871 PerfData::U_Events, CHECK);
872 }
873 }
875 // ------------------------------------------------------------------
876 // CompileBroker::compilation_init
877 //
878 // Initialize the Compilation object
879 void CompileBroker::compilation_init() {
880 _last_method_compiled[0] = '\0';
882 // No need to initialize compilation system if we do not use it.
883 if (!UseCompiler) {
884 return;
885 }
886 #ifndef SHARK
887 // Set the interface to the current compiler(s).
888 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
889 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
890 #ifdef COMPILER1
891 if (c1_count > 0) {
892 _compilers[0] = new Compiler();
893 }
894 #endif // COMPILER1
896 #ifdef COMPILER2
897 if (c2_count > 0) {
898 _compilers[1] = new C2Compiler();
899 }
900 #endif // COMPILER2
902 #else // SHARK
903 int c1_count = 0;
904 int c2_count = 1;
906 _compilers[1] = new SharkCompiler();
907 #endif // SHARK
909 // Start the CompilerThreads
910 init_compiler_threads(c1_count, c2_count);
911 // totalTime performance counter is always created as it is required
912 // by the implementation of java.lang.management.CompilationMBean.
913 {
914 EXCEPTION_MARK;
915 _perf_total_compilation =
916 PerfDataManager::create_counter(JAVA_CI, "totalTime",
917 PerfData::U_Ticks, CHECK);
918 }
921 if (UsePerfData) {
923 EXCEPTION_MARK;
925 // create the jvmstat performance counters
926 _perf_osr_compilation =
927 PerfDataManager::create_counter(SUN_CI, "osrTime",
928 PerfData::U_Ticks, CHECK);
930 _perf_standard_compilation =
931 PerfDataManager::create_counter(SUN_CI, "standardTime",
932 PerfData::U_Ticks, CHECK);
934 _perf_total_bailout_count =
935 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
936 PerfData::U_Events, CHECK);
938 _perf_total_invalidated_count =
939 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
940 PerfData::U_Events, CHECK);
942 _perf_total_compile_count =
943 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
944 PerfData::U_Events, CHECK);
945 _perf_total_osr_compile_count =
946 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
947 PerfData::U_Events, CHECK);
949 _perf_total_standard_compile_count =
950 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
951 PerfData::U_Events, CHECK);
953 _perf_sum_osr_bytes_compiled =
954 PerfDataManager::create_counter(SUN_CI, "osrBytes",
955 PerfData::U_Bytes, CHECK);
957 _perf_sum_standard_bytes_compiled =
958 PerfDataManager::create_counter(SUN_CI, "standardBytes",
959 PerfData::U_Bytes, CHECK);
961 _perf_sum_nmethod_size =
962 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
963 PerfData::U_Bytes, CHECK);
965 _perf_sum_nmethod_code_size =
966 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
967 PerfData::U_Bytes, CHECK);
969 _perf_last_method =
970 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
971 CompilerCounters::cmname_buffer_length,
972 "", CHECK);
974 _perf_last_failed_method =
975 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
976 CompilerCounters::cmname_buffer_length,
977 "", CHECK);
979 _perf_last_invalidated_method =
980 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
981 CompilerCounters::cmname_buffer_length,
982 "", CHECK);
984 _perf_last_compile_type =
985 PerfDataManager::create_variable(SUN_CI, "lastType",
986 PerfData::U_None,
987 (jlong)CompileBroker::no_compile,
988 CHECK);
990 _perf_last_compile_size =
991 PerfDataManager::create_variable(SUN_CI, "lastSize",
992 PerfData::U_Bytes,
993 (jlong)CompileBroker::no_compile,
994 CHECK);
997 _perf_last_failed_type =
998 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
999 PerfData::U_None,
1000 (jlong)CompileBroker::no_compile,
1001 CHECK);
1003 _perf_last_invalidated_type =
1004 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1005 PerfData::U_None,
1006 (jlong)CompileBroker::no_compile,
1007 CHECK);
1008 }
1010 _initialized = true;
1011 }
1014 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1015 AbstractCompiler* comp, TRAPS) {
1016 CompilerThread* compiler_thread = NULL;
1018 Klass* k =
1019 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1020 true, CHECK_0);
1021 instanceKlassHandle klass (THREAD, k);
1022 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1023 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1025 // Initialize thread_oop to put it into the system threadGroup
1026 Handle thread_group (THREAD, Universe::system_thread_group());
1027 JavaValue result(T_VOID);
1028 JavaCalls::call_special(&result, thread_oop,
1029 klass,
1030 vmSymbols::object_initializer_name(),
1031 vmSymbols::threadgroup_string_void_signature(),
1032 thread_group,
1033 string,
1034 CHECK_0);
1036 {
1037 MutexLocker mu(Threads_lock, THREAD);
1038 compiler_thread = new CompilerThread(queue, counters);
1039 // At this point the new CompilerThread data-races with this startup
1040 // thread (which I believe is the primoridal thread and NOT the VM
1041 // thread). This means Java bytecodes being executed at startup can
1042 // queue compile jobs which will run at whatever default priority the
1043 // newly created CompilerThread runs at.
1046 // At this point it may be possible that no osthread was created for the
1047 // JavaThread due to lack of memory. We would have to throw an exception
1048 // in that case. However, since this must work and we do not allow
1049 // exceptions anyway, check and abort if this fails.
1051 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1052 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1053 "unable to create new native thread");
1054 }
1056 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1058 // Note that this only sets the JavaThread _priority field, which by
1059 // definition is limited to Java priorities and not OS priorities.
1060 // The os-priority is set in the CompilerThread startup code itself
1062 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1064 // Note that we cannot call os::set_priority because it expects Java
1065 // priorities and we are *explicitly* using OS priorities so that it's
1066 // possible to set the compiler thread priority higher than any Java
1067 // thread.
1069 int native_prio = CompilerThreadPriority;
1070 if (native_prio == -1) {
1071 if (UseCriticalCompilerThreadPriority) {
1072 native_prio = os::java_to_os_priority[CriticalPriority];
1073 } else {
1074 native_prio = os::java_to_os_priority[NearMaxPriority];
1075 }
1076 }
1077 os::set_native_priority(compiler_thread, native_prio);
1079 java_lang_Thread::set_daemon(thread_oop());
1081 compiler_thread->set_threadObj(thread_oop());
1082 compiler_thread->set_compiler(comp);
1083 Threads::add(compiler_thread);
1084 Thread::start(compiler_thread);
1085 }
1087 // Let go of Threads_lock before yielding
1088 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1090 return compiler_thread;
1091 }
1094 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1095 EXCEPTION_MARK;
1096 #if !defined(ZERO) && !defined(SHARK)
1097 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1098 #endif // !ZERO && !SHARK
1099 // Initialize the compilation queue
1100 if (c2_compiler_count > 0) {
1101 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1102 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1103 }
1104 if (c1_compiler_count > 0) {
1105 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1106 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1107 }
1109 int compiler_count = c1_compiler_count + c2_compiler_count;
1111 _compiler_threads =
1112 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1114 char name_buffer[256];
1115 for (int i = 0; i < c2_compiler_count; i++) {
1116 // Create a name for our thread.
1117 sprintf(name_buffer, "C2 CompilerThread%d", i);
1118 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1119 // Shark and C2
1120 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1121 _compiler_threads->append(new_thread);
1122 }
1124 for (int i = c2_compiler_count; i < compiler_count; i++) {
1125 // Create a name for our thread.
1126 sprintf(name_buffer, "C1 CompilerThread%d", i);
1127 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1128 // C1
1129 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1130 _compiler_threads->append(new_thread);
1131 }
1133 if (UsePerfData) {
1134 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1135 }
1136 }
1139 /**
1140 * Set the methods on the stack as on_stack so that redefine classes doesn't
1141 * reclaim them. This method is executed at a safepoint.
1142 */
1143 void CompileBroker::mark_on_stack() {
1144 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1145 // Since we are at a safepoint, we do not need a lock to access
1146 // the compile queues.
1147 if (_c2_compile_queue != NULL) {
1148 _c2_compile_queue->mark_on_stack();
1149 }
1150 if (_c1_compile_queue != NULL) {
1151 _c1_compile_queue->mark_on_stack();
1152 }
1153 }
1155 // ------------------------------------------------------------------
1156 // CompileBroker::compile_method
1157 //
1158 // Request compilation of a method.
1159 void CompileBroker::compile_method_base(methodHandle method,
1160 int osr_bci,
1161 int comp_level,
1162 methodHandle hot_method,
1163 int hot_count,
1164 const char* comment,
1165 Thread* thread) {
1166 // do nothing if compiler thread(s) is not available
1167 if (!_initialized) {
1168 return;
1169 }
1171 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1172 assert(method->method_holder()->oop_is_instance(),
1173 "sanity check");
1174 assert(!method->method_holder()->is_not_initialized(),
1175 "method holder must be initialized");
1176 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1178 if (CIPrintRequests) {
1179 tty->print("request: ");
1180 method->print_short_name(tty);
1181 if (osr_bci != InvocationEntryBci) {
1182 tty->print(" osr_bci: %d", osr_bci);
1183 }
1184 tty->print(" comment: %s count: %d", comment, hot_count);
1185 if (!hot_method.is_null()) {
1186 tty->print(" hot: ");
1187 if (hot_method() != method()) {
1188 hot_method->print_short_name(tty);
1189 } else {
1190 tty->print("yes");
1191 }
1192 }
1193 tty->cr();
1194 }
1196 // A request has been made for compilation. Before we do any
1197 // real work, check to see if the method has been compiled
1198 // in the meantime with a definitive result.
1199 if (compilation_is_complete(method, osr_bci, comp_level)) {
1200 return;
1201 }
1203 #ifndef PRODUCT
1204 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1205 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1206 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1207 return;
1208 }
1209 }
1210 #endif
1212 // If this method is already in the compile queue, then
1213 // we do not block the current thread.
1214 if (compilation_is_in_queue(method)) {
1215 // We may want to decay our counter a bit here to prevent
1216 // multiple denied requests for compilation. This is an
1217 // open compilation policy issue. Note: The other possibility,
1218 // in the case that this is a blocking compile request, is to have
1219 // all subsequent blocking requesters wait for completion of
1220 // ongoing compiles. Note that in this case we'll need a protocol
1221 // for freeing the associated compile tasks. [Or we could have
1222 // a single static monitor on which all these waiters sleep.]
1223 return;
1224 }
1226 // If the requesting thread is holding the pending list lock
1227 // then we just return. We can't risk blocking while holding
1228 // the pending list lock or a 3-way deadlock may occur
1229 // between the reference handler thread, a GC (instigated
1230 // by a compiler thread), and compiled method registration.
1231 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1232 return;
1233 }
1235 if (TieredCompilation) {
1236 // Tiered policy requires MethodCounters to exist before adding a method to
1237 // the queue. Create if we don't have them yet.
1238 method->get_method_counters(thread);
1239 }
1241 // Outputs from the following MutexLocker block:
1242 CompileTask* task = NULL;
1243 bool blocking = false;
1244 CompileQueue* queue = compile_queue(comp_level);
1246 // Acquire our lock.
1247 {
1248 MutexLocker locker(queue->lock(), thread);
1250 // Make sure the method has not slipped into the queues since
1251 // last we checked; note that those checks were "fast bail-outs".
1252 // Here we need to be more careful, see 14012000 below.
1253 if (compilation_is_in_queue(method)) {
1254 return;
1255 }
1257 // We need to check again to see if the compilation has
1258 // completed. A previous compilation may have registered
1259 // some result.
1260 if (compilation_is_complete(method, osr_bci, comp_level)) {
1261 return;
1262 }
1264 // We now know that this compilation is not pending, complete,
1265 // or prohibited. Assign a compile_id to this compilation
1266 // and check to see if it is in our [Start..Stop) range.
1267 int compile_id = assign_compile_id(method, osr_bci);
1268 if (compile_id == 0) {
1269 // The compilation falls outside the allowed range.
1270 return;
1271 }
1273 // Should this thread wait for completion of the compile?
1274 blocking = is_compile_blocking();
1276 // We will enter the compilation in the queue.
1277 // 14012000: Note that this sets the queued_for_compile bits in
1278 // the target method. We can now reason that a method cannot be
1279 // queued for compilation more than once, as follows:
1280 // Before a thread queues a task for compilation, it first acquires
1281 // the compile queue lock, then checks if the method's queued bits
1282 // are set or it has already been compiled. Thus there can not be two
1283 // instances of a compilation task for the same method on the
1284 // compilation queue. Consider now the case where the compilation
1285 // thread has already removed a task for that method from the queue
1286 // and is in the midst of compiling it. In this case, the
1287 // queued_for_compile bits must be set in the method (and these
1288 // will be visible to the current thread, since the bits were set
1289 // under protection of the compile queue lock, which we hold now.
1290 // When the compilation completes, the compiler thread first sets
1291 // the compilation result and then clears the queued_for_compile
1292 // bits. Neither of these actions are protected by a barrier (or done
1293 // under the protection of a lock), so the only guarantee we have
1294 // (on machines with TSO (Total Store Order)) is that these values
1295 // will update in that order. As a result, the only combinations of
1296 // these bits that the current thread will see are, in temporal order:
1297 // <RESULT, QUEUE> :
1298 // <0, 1> : in compile queue, but not yet compiled
1299 // <1, 1> : compiled but queue bit not cleared
1300 // <1, 0> : compiled and queue bit cleared
1301 // Because we first check the queue bits then check the result bits,
1302 // we are assured that we cannot introduce a duplicate task.
1303 // Note that if we did the tests in the reverse order (i.e. check
1304 // result then check queued bit), we could get the result bit before
1305 // the compilation completed, and the queue bit after the compilation
1306 // completed, and end up introducing a "duplicate" (redundant) task.
1307 // In that case, the compiler thread should first check if a method
1308 // has already been compiled before trying to compile it.
1309 // NOTE: in the event that there are multiple compiler threads and
1310 // there is de-optimization/recompilation, things will get hairy,
1311 // and in that case it's best to protect both the testing (here) of
1312 // these bits, and their updating (here and elsewhere) under a
1313 // common lock.
1314 task = create_compile_task(queue,
1315 compile_id, method,
1316 osr_bci, comp_level,
1317 hot_method, hot_count, comment,
1318 blocking);
1319 }
1321 if (blocking) {
1322 wait_for_completion(task);
1323 }
1324 }
1327 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1328 int comp_level,
1329 methodHandle hot_method, int hot_count,
1330 const char* comment, Thread* THREAD) {
1331 // make sure arguments make sense
1332 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1333 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1334 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1335 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1336 // allow any levels for WhiteBox
1337 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1338 // return quickly if possible
1340 // lock, make sure that the compilation
1341 // isn't prohibited in a straightforward way.
1342 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1343 if (comp == NULL || !comp->can_compile_method(method) ||
1344 compilation_is_prohibited(method, osr_bci, comp_level)) {
1345 return NULL;
1346 }
1348 if (osr_bci == InvocationEntryBci) {
1349 // standard compilation
1350 nmethod* method_code = method->code();
1351 if (method_code != NULL) {
1352 if (compilation_is_complete(method, osr_bci, comp_level)) {
1353 return method_code;
1354 }
1355 }
1356 if (method->is_not_compilable(comp_level)) {
1357 return NULL;
1358 }
1359 } else {
1360 // osr compilation
1361 #ifndef TIERED
1362 // seems like an assert of dubious value
1363 assert(comp_level == CompLevel_highest_tier,
1364 "all OSR compiles are assumed to be at a single compilation lavel");
1365 #endif // TIERED
1366 // We accept a higher level osr method
1367 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1368 if (nm != NULL) return nm;
1369 if (method->is_not_osr_compilable(comp_level)) return NULL;
1370 }
1372 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1373 // some prerequisites that are compiler specific
1374 if (comp->is_c2() || comp->is_shark()) {
1375 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1376 // Resolve all classes seen in the signature of the method
1377 // we are compiling.
1378 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1379 }
1381 // If the method is native, do the lookup in the thread requesting
1382 // the compilation. Native lookups can load code, which is not
1383 // permitted during compilation.
1384 //
1385 // Note: A native method implies non-osr compilation which is
1386 // checked with an assertion at the entry of this method.
1387 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1388 bool in_base_library;
1389 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1390 if (HAS_PENDING_EXCEPTION) {
1391 // In case of an exception looking up the method, we just forget
1392 // about it. The interpreter will kick-in and throw the exception.
1393 method->set_not_compilable(); // implies is_not_osr_compilable()
1394 CLEAR_PENDING_EXCEPTION;
1395 return NULL;
1396 }
1397 assert(method->has_native_function(), "must have native code by now");
1398 }
1400 // RedefineClasses() has replaced this method; just return
1401 if (method->is_old()) {
1402 return NULL;
1403 }
1405 // JVMTI -- post_compile_event requires jmethod_id() that may require
1406 // a lock the compiling thread can not acquire. Prefetch it here.
1407 if (JvmtiExport::should_post_compiled_method_load()) {
1408 method->jmethod_id();
1409 }
1411 // do the compilation
1412 if (method->is_native()) {
1413 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1414 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1415 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1416 //
1417 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1418 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1419 AdapterHandlerLibrary::create_native_wrapper(method);
1420 } else {
1421 return NULL;
1422 }
1423 } else {
1424 // If the compiler is shut off due to code cache getting full
1425 // fail out now so blocking compiles dont hang the java thread
1426 if (!should_compile_new_jobs()) {
1427 CompilationPolicy::policy()->delay_compilation(method());
1428 return NULL;
1429 }
1430 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1431 }
1433 // return requested nmethod
1434 // We accept a higher level osr method
1435 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1436 }
1439 // ------------------------------------------------------------------
1440 // CompileBroker::compilation_is_complete
1441 //
1442 // See if compilation of this method is already complete.
1443 bool CompileBroker::compilation_is_complete(methodHandle method,
1444 int osr_bci,
1445 int comp_level) {
1446 bool is_osr = (osr_bci != standard_entry_bci);
1447 if (is_osr) {
1448 if (method->is_not_osr_compilable(comp_level)) {
1449 return true;
1450 } else {
1451 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1452 return (result != NULL);
1453 }
1454 } else {
1455 if (method->is_not_compilable(comp_level)) {
1456 return true;
1457 } else {
1458 nmethod* result = method->code();
1459 if (result == NULL) return false;
1460 return comp_level == result->comp_level();
1461 }
1462 }
1463 }
1466 /**
1467 * See if this compilation is already requested.
1468 *
1469 * Implementation note: there is only a single "is in queue" bit
1470 * for each method. This means that the check below is overly
1471 * conservative in the sense that an osr compilation in the queue
1472 * will block a normal compilation from entering the queue (and vice
1473 * versa). This can be remedied by a full queue search to disambiguate
1474 * cases. If it is deemed profitable, this may be done.
1475 */
1476 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1477 return method->queued_for_compilation();
1478 }
1480 // ------------------------------------------------------------------
1481 // CompileBroker::compilation_is_prohibited
1482 //
1483 // See if this compilation is not allowed.
1484 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1485 bool is_native = method->is_native();
1486 // Some compilers may not support the compilation of natives.
1487 AbstractCompiler *comp = compiler(comp_level);
1488 if (is_native &&
1489 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1490 method->set_not_compilable_quietly(comp_level);
1491 return true;
1492 }
1494 bool is_osr = (osr_bci != standard_entry_bci);
1495 // Some compilers may not support on stack replacement.
1496 if (is_osr &&
1497 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1498 method->set_not_osr_compilable(comp_level);
1499 return true;
1500 }
1502 // The method may be explicitly excluded by the user.
1503 bool quietly;
1504 if (CompilerOracle::should_exclude(method, quietly)) {
1505 if (!quietly) {
1506 // This does not happen quietly...
1507 ResourceMark rm;
1508 tty->print("### Excluding %s:%s",
1509 method->is_native() ? "generation of native wrapper" : "compile",
1510 (method->is_static() ? " static" : ""));
1511 method->print_short_name(tty);
1512 tty->cr();
1513 }
1514 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1515 }
1517 return false;
1518 }
1520 /**
1521 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1522 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1523 * The function also allows to generate separate compilation IDs for OSR compilations.
1524 */
1525 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1526 #ifdef ASSERT
1527 bool is_osr = (osr_bci != standard_entry_bci);
1528 int id;
1529 if (method->is_native()) {
1530 assert(!is_osr, "can't be osr");
1531 // Adapters, native wrappers and method handle intrinsics
1532 // should be generated always.
1533 return Atomic::add(1, &_compilation_id);
1534 } else if (CICountOSR && is_osr) {
1535 id = Atomic::add(1, &_osr_compilation_id);
1536 if (CIStartOSR <= id && id < CIStopOSR) {
1537 return id;
1538 }
1539 } else {
1540 id = Atomic::add(1, &_compilation_id);
1541 if (CIStart <= id && id < CIStop) {
1542 return id;
1543 }
1544 }
1546 // Method was not in the appropriate compilation range.
1547 method->set_not_compilable_quietly();
1548 return 0;
1549 #else
1550 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1551 // only _compilation_id is incremented.
1552 return Atomic::add(1, &_compilation_id);
1553 #endif
1554 }
1556 /**
1557 * Should the current thread block until this compilation request
1558 * has been fulfilled?
1559 */
1560 bool CompileBroker::is_compile_blocking() {
1561 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1562 return !BackgroundCompilation;
1563 }
1566 // ------------------------------------------------------------------
1567 // CompileBroker::preload_classes
1568 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1569 // Move this code over from c1_Compiler.cpp
1570 ShouldNotReachHere();
1571 }
1574 // ------------------------------------------------------------------
1575 // CompileBroker::create_compile_task
1576 //
1577 // Create a CompileTask object representing the current request for
1578 // compilation. Add this task to the queue.
1579 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1580 int compile_id,
1581 methodHandle method,
1582 int osr_bci,
1583 int comp_level,
1584 methodHandle hot_method,
1585 int hot_count,
1586 const char* comment,
1587 bool blocking) {
1588 CompileTask* new_task = CompileTask::allocate();
1589 new_task->initialize(compile_id, method, osr_bci, comp_level,
1590 hot_method, hot_count, comment,
1591 blocking);
1592 queue->add(new_task);
1593 return new_task;
1594 }
1597 /**
1598 * Wait for the compilation task to complete.
1599 */
1600 void CompileBroker::wait_for_completion(CompileTask* task) {
1601 if (CIPrintCompileQueue) {
1602 ttyLocker ttyl;
1603 tty->print_cr("BLOCKING FOR COMPILE");
1604 }
1606 assert(task->is_blocking(), "can only wait on blocking task");
1608 JavaThread* thread = JavaThread::current();
1609 thread->set_blocked_on_compilation(true);
1611 methodHandle method(thread, task->method());
1612 {
1613 MutexLocker waiter(task->lock(), thread);
1615 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1616 task->lock()->wait();
1617 }
1618 }
1620 thread->set_blocked_on_compilation(false);
1621 if (is_compilation_disabled_forever()) {
1622 CompileTask::free(task);
1623 return;
1624 }
1626 // It is harmless to check this status without the lock, because
1627 // completion is a stable property (until the task object is recycled).
1628 assert(task->is_complete(), "Compilation should have completed");
1629 assert(task->code_handle() == NULL, "must be reset");
1631 // By convention, the waiter is responsible for recycling a
1632 // blocking CompileTask. Since there is only one waiter ever
1633 // waiting on a CompileTask, we know that no one else will
1634 // be using this CompileTask; we can free it.
1635 CompileTask::free(task);
1636 }
1638 /**
1639 * Initialize compiler thread(s) + compiler object(s). The postcondition
1640 * of this function is that the compiler runtimes are initialized and that
1641 * compiler threads can start compiling.
1642 */
1643 bool CompileBroker::init_compiler_runtime() {
1644 CompilerThread* thread = CompilerThread::current();
1645 AbstractCompiler* comp = thread->compiler();
1646 // Final sanity check - the compiler object must exist
1647 guarantee(comp != NULL, "Compiler object must exist");
1649 int system_dictionary_modification_counter;
1650 {
1651 MutexLocker locker(Compile_lock, thread);
1652 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1653 }
1655 {
1656 // Must switch to native to allocate ci_env
1657 ThreadToNativeFromVM ttn(thread);
1658 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1659 // Cache Jvmti state
1660 ci_env.cache_jvmti_state();
1661 // Cache DTrace flags
1662 ci_env.cache_dtrace_flags();
1664 // Switch back to VM state to do compiler initialization
1665 ThreadInVMfromNative tv(thread);
1666 ResetNoHandleMark rnhm;
1669 if (!comp->is_shark()) {
1670 // Perform per-thread and global initializations
1671 comp->initialize();
1672 }
1673 }
1675 if (comp->is_failed()) {
1676 disable_compilation_forever();
1677 // If compiler initialization failed, no compiler thread that is specific to a
1678 // particular compiler runtime will ever start to compile methods.
1679 shutdown_compiler_runtime(comp, thread);
1680 return false;
1681 }
1683 // C1 specific check
1684 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1685 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1686 return false;
1687 }
1689 return true;
1690 }
1692 /**
1693 * If C1 and/or C2 initialization failed, we shut down all compilation.
1694 * We do this to keep things simple. This can be changed if it ever turns
1695 * out to be a problem.
1696 */
1697 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1698 // Free buffer blob, if allocated
1699 if (thread->get_buffer_blob() != NULL) {
1700 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1701 CodeCache::free(thread->get_buffer_blob());
1702 }
1704 if (comp->should_perform_shutdown()) {
1705 // There are two reasons for shutting down the compiler
1706 // 1) compiler runtime initialization failed
1707 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1708 warning("%s initialization failed. Shutting down all compilers", comp->name());
1710 // Only one thread per compiler runtime object enters here
1711 // Set state to shut down
1712 comp->set_shut_down();
1714 // Delete all queued compilation tasks to make compiler threads exit faster.
1715 if (_c1_compile_queue != NULL) {
1716 _c1_compile_queue->free_all();
1717 }
1719 if (_c2_compile_queue != NULL) {
1720 _c2_compile_queue->free_all();
1721 }
1723 // Set flags so that we continue execution with using interpreter only.
1724 UseCompiler = false;
1725 UseInterpreter = true;
1727 // We could delete compiler runtimes also. However, there are references to
1728 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1729 // fail. This can be done later if necessary.
1730 }
1731 }
1733 // ------------------------------------------------------------------
1734 // CompileBroker::compiler_thread_loop
1735 //
1736 // The main loop run by a CompilerThread.
1737 void CompileBroker::compiler_thread_loop() {
1738 CompilerThread* thread = CompilerThread::current();
1739 CompileQueue* queue = thread->queue();
1740 // For the thread that initializes the ciObjectFactory
1741 // this resource mark holds all the shared objects
1742 ResourceMark rm;
1744 // First thread to get here will initialize the compiler interface
1746 if (!ciObjectFactory::is_initialized()) {
1747 ASSERT_IN_VM;
1748 MutexLocker only_one (CompileThread_lock, thread);
1749 if (!ciObjectFactory::is_initialized()) {
1750 ciObjectFactory::initialize();
1751 }
1752 }
1754 // Open a log.
1755 if (LogCompilation) {
1756 init_compiler_thread_log();
1757 }
1758 CompileLog* log = thread->log();
1759 if (log != NULL) {
1760 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1761 thread->name(),
1762 os::current_thread_id(),
1763 os::current_process_id());
1764 log->stamp();
1765 log->end_elem();
1766 }
1768 // If compiler thread/runtime initialization fails, exit the compiler thread
1769 if (!init_compiler_runtime()) {
1770 return;
1771 }
1773 // Poll for new compilation tasks as long as the JVM runs. Compilation
1774 // should only be disabled if something went wrong while initializing the
1775 // compiler runtimes. This, in turn, should not happen. The only known case
1776 // when compiler runtime initialization fails is if there is not enough free
1777 // space in the code cache to generate the necessary stubs, etc.
1778 while (!is_compilation_disabled_forever()) {
1779 // We need this HandleMark to avoid leaking VM handles.
1780 HandleMark hm(thread);
1782 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1783 // the code cache is really full
1784 handle_full_code_cache();
1785 }
1787 CompileTask* task = queue->get();
1788 if (task == NULL) {
1789 continue;
1790 }
1792 // Give compiler threads an extra quanta. They tend to be bursty and
1793 // this helps the compiler to finish up the job.
1794 if( CompilerThreadHintNoPreempt )
1795 os::hint_no_preempt();
1797 // trace per thread time and compile statistics
1798 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1799 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1801 // Assign the task to the current thread. Mark this compilation
1802 // thread as active for the profiler.
1803 CompileTaskWrapper ctw(task);
1804 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1805 task->set_code_handle(&result_handle);
1806 methodHandle method(thread, task->method());
1808 // Never compile a method if breakpoints are present in it
1809 if (method()->number_of_breakpoints() == 0) {
1810 // Compile the method.
1811 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1812 invoke_compiler_on_method(task);
1813 } else {
1814 // After compilation is disabled, remove remaining methods from queue
1815 method->clear_queued_for_compilation();
1816 task->set_failure_reason("compilation is disabled");
1817 }
1818 }
1819 }
1821 // Shut down compiler runtime
1822 shutdown_compiler_runtime(thread->compiler(), thread);
1823 }
1825 // ------------------------------------------------------------------
1826 // CompileBroker::init_compiler_thread_log
1827 //
1828 // Set up state required by +LogCompilation.
1829 void CompileBroker::init_compiler_thread_log() {
1830 CompilerThread* thread = CompilerThread::current();
1831 char file_name[4*K];
1832 FILE* fp = NULL;
1833 intx thread_id = os::current_thread_id();
1834 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1835 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1836 if (dir == NULL) {
1837 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1838 thread_id, os::current_process_id());
1839 } else {
1840 jio_snprintf(file_name, sizeof(file_name),
1841 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1842 os::file_separator(), thread_id, os::current_process_id());
1843 }
1845 fp = fopen(file_name, "at");
1846 if (fp != NULL) {
1847 if (LogCompilation && Verbose) {
1848 tty->print_cr("Opening compilation log %s", file_name);
1849 }
1850 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1851 thread->init_log(log);
1853 if (xtty != NULL) {
1854 ttyLocker ttyl;
1855 // Record any per thread log files
1856 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1857 }
1858 return;
1859 }
1860 }
1861 warning("Cannot open log file: %s", file_name);
1862 }
1864 // ------------------------------------------------------------------
1865 // CompileBroker::set_should_block
1866 //
1867 // Set _should_block.
1868 // Call this from the VM, with Threads_lock held and a safepoint requested.
1869 void CompileBroker::set_should_block() {
1870 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1871 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1872 #ifndef PRODUCT
1873 if (PrintCompilation && (Verbose || WizardMode))
1874 tty->print_cr("notifying compiler thread pool to block");
1875 #endif
1876 _should_block = true;
1877 }
1879 // ------------------------------------------------------------------
1880 // CompileBroker::maybe_block
1881 //
1882 // Call this from the compiler at convenient points, to poll for _should_block.
1883 void CompileBroker::maybe_block() {
1884 if (_should_block) {
1885 #ifndef PRODUCT
1886 if (PrintCompilation && (Verbose || WizardMode))
1887 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1888 #endif
1889 ThreadInVMfromNative tivfn(JavaThread::current());
1890 }
1891 }
1893 // wrapper for CodeCache::print_summary()
1894 static void codecache_print(bool detailed)
1895 {
1896 ResourceMark rm;
1897 stringStream s;
1898 // Dump code cache into a buffer before locking the tty,
1899 {
1900 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1901 CodeCache::print_summary(&s, detailed);
1902 }
1903 ttyLocker ttyl;
1904 tty->print("%s", s.as_string());
1905 }
1907 // ------------------------------------------------------------------
1908 // CompileBroker::invoke_compiler_on_method
1909 //
1910 // Compile a method.
1911 //
1912 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1913 if (PrintCompilation) {
1914 ResourceMark rm;
1915 task->print_line();
1916 }
1917 elapsedTimer time;
1919 CompilerThread* thread = CompilerThread::current();
1920 ResourceMark rm(thread);
1922 if (LogEvents) {
1923 _compilation_log->log_compile(thread, task);
1924 }
1926 // Common flags.
1927 uint compile_id = task->compile_id();
1928 int osr_bci = task->osr_bci();
1929 bool is_osr = (osr_bci != standard_entry_bci);
1930 bool should_log = (thread->log() != NULL);
1931 bool should_break = false;
1932 int task_level = task->comp_level();
1933 {
1934 // create the handle inside it's own block so it can't
1935 // accidentally be referenced once the thread transitions to
1936 // native. The NoHandleMark before the transition should catch
1937 // any cases where this occurs in the future.
1938 methodHandle method(thread, task->method());
1939 should_break = check_break_at(method, compile_id, is_osr);
1940 if (should_log && !CompilerOracle::should_log(method)) {
1941 should_log = false;
1942 }
1943 assert(!method->is_native(), "no longer compile natives");
1945 // Save information about this method in case of failure.
1946 set_last_compile(thread, method, is_osr, task_level);
1948 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1949 }
1951 // Allocate a new set of JNI handles.
1952 push_jni_handle_block();
1953 Method* target_handle = task->method();
1954 int compilable = ciEnv::MethodCompilable;
1955 {
1956 int system_dictionary_modification_counter;
1957 {
1958 MutexLocker locker(Compile_lock, thread);
1959 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1960 }
1962 NoHandleMark nhm;
1963 ThreadToNativeFromVM ttn(thread);
1965 ciEnv ci_env(task, system_dictionary_modification_counter);
1966 if (should_break) {
1967 ci_env.set_break_at_compile(true);
1968 }
1969 if (should_log) {
1970 ci_env.set_log(thread->log());
1971 }
1972 assert(thread->env() == &ci_env, "set by ci_env");
1973 // The thread-env() field is cleared in ~CompileTaskWrapper.
1975 // Cache Jvmti state
1976 ci_env.cache_jvmti_state();
1978 // Cache DTrace flags
1979 ci_env.cache_dtrace_flags();
1981 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1983 TraceTime t1("compilation", &time);
1984 EventCompilation event;
1986 AbstractCompiler *comp = compiler(task_level);
1987 if (comp == NULL) {
1988 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1989 } else {
1990 comp->compile_method(&ci_env, target, osr_bci);
1991 }
1993 if (!ci_env.failing() && task->code() == NULL) {
1994 //assert(false, "compiler should always document failure");
1995 // The compiler elected, without comment, not to register a result.
1996 // Do not attempt further compilations of this method.
1997 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1998 }
2000 // Copy this bit to the enclosing block:
2001 compilable = ci_env.compilable();
2003 if (ci_env.failing()) {
2004 task->set_failure_reason(ci_env.failure_reason());
2005 const char* retry_message = ci_env.retry_message();
2006 if (_compilation_log != NULL) {
2007 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2008 }
2009 if (PrintCompilation) {
2010 FormatBufferResource msg = retry_message != NULL ?
2011 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2012 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2013 task->print_compilation(tty, msg);
2014 }
2015 } else {
2016 task->mark_success();
2017 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2018 if (_compilation_log != NULL) {
2019 nmethod* code = task->code();
2020 if (code != NULL) {
2021 _compilation_log->log_nmethod(thread, code);
2022 }
2023 }
2024 }
2025 // simulate crash during compilation
2026 assert(task->compile_id() != CICrashAt, "just as planned");
2027 if (event.should_commit()) {
2028 event.set_method(target->get_Method());
2029 event.set_compileID(compile_id);
2030 event.set_compileLevel(task->comp_level());
2031 event.set_succeded(task->is_success());
2032 event.set_isOsr(is_osr);
2033 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2034 event.set_inlinedBytes(task->num_inlined_bytecodes());
2035 event.commit();
2036 }
2037 }
2038 pop_jni_handle_block();
2040 methodHandle method(thread, task->method());
2042 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2044 collect_statistics(thread, time, task);
2046 if (PrintCompilation && PrintCompilation2) {
2047 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2048 tty->print("%4d ", compile_id); // print compilation number
2049 tty->print("%s ", (is_osr ? "%" : " "));
2050 if (task->code() != NULL) {
2051 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2052 }
2053 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2054 }
2056 if (PrintCodeCacheOnCompilation)
2057 codecache_print(/* detailed= */ false);
2059 // Disable compilation, if required.
2060 switch (compilable) {
2061 case ciEnv::MethodCompilable_never:
2062 if (is_osr)
2063 method->set_not_osr_compilable_quietly();
2064 else
2065 method->set_not_compilable_quietly();
2066 break;
2067 case ciEnv::MethodCompilable_not_at_tier:
2068 if (is_osr)
2069 method->set_not_osr_compilable_quietly(task_level);
2070 else
2071 method->set_not_compilable_quietly(task_level);
2072 break;
2073 }
2075 // Note that the queued_for_compilation bits are cleared without
2076 // protection of a mutex. [They were set by the requester thread,
2077 // when adding the task to the compile queue -- at which time the
2078 // compile queue lock was held. Subsequently, we acquired the compile
2079 // queue lock to get this task off the compile queue; thus (to belabour
2080 // the point somewhat) our clearing of the bits must be occurring
2081 // only after the setting of the bits. See also 14012000 above.
2082 method->clear_queued_for_compilation();
2084 #ifdef ASSERT
2085 if (CollectedHeap::fired_fake_oom()) {
2086 // The current compile received a fake OOM during compilation so
2087 // go ahead and exit the VM since the test apparently succeeded
2088 tty->print_cr("*** Shutting down VM after successful fake OOM");
2089 vm_exit(0);
2090 }
2091 #endif
2092 }
2094 /**
2095 * The CodeCache is full. Print out warning and disable compilation
2096 * or try code cache cleaning so compilation can continue later.
2097 */
2098 void CompileBroker::handle_full_code_cache() {
2099 UseInterpreter = true;
2100 if (UseCompiler || AlwaysCompileLoopMethods ) {
2101 if (xtty != NULL) {
2102 ResourceMark rm;
2103 stringStream s;
2104 // Dump code cache state into a buffer before locking the tty,
2105 // because log_state() will use locks causing lock conflicts.
2106 CodeCache::log_state(&s);
2107 // Lock to prevent tearing
2108 ttyLocker ttyl;
2109 xtty->begin_elem("code_cache_full");
2110 xtty->print("%s", s.as_string());
2111 xtty->stamp();
2112 xtty->end_elem();
2113 }
2115 CodeCache::report_codemem_full();
2117 #ifndef PRODUCT
2118 if (CompileTheWorld || ExitOnFullCodeCache) {
2119 codecache_print(/* detailed= */ true);
2120 before_exit(JavaThread::current());
2121 exit_globals(); // will delete tty
2122 vm_direct_exit(CompileTheWorld ? 0 : 1);
2123 }
2124 #endif
2125 if (UseCodeCacheFlushing) {
2126 // Since code cache is full, immediately stop new compiles
2127 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2128 NMethodSweeper::log_sweep("disable_compiler");
2129 }
2130 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2131 // without having to consider the state in which the current thread is.
2132 ThreadInVMfromUnknown in_vm;
2133 NMethodSweeper::possibly_sweep();
2134 } else {
2135 disable_compilation_forever();
2136 }
2138 // Print warning only once
2139 if (should_print_compiler_warning()) {
2140 warning("CodeCache is full. Compiler has been disabled.");
2141 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2142 codecache_print(/* detailed= */ true);
2143 }
2144 }
2145 }
2147 // ------------------------------------------------------------------
2148 // CompileBroker::set_last_compile
2149 //
2150 // Record this compilation for debugging purposes.
2151 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2152 ResourceMark rm;
2153 char* method_name = method->name()->as_C_string();
2154 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2155 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2156 char current_method[CompilerCounters::cmname_buffer_length];
2157 size_t maxLen = CompilerCounters::cmname_buffer_length;
2159 if (UsePerfData) {
2160 const char* class_name = method->method_holder()->name()->as_C_string();
2162 size_t s1len = strlen(class_name);
2163 size_t s2len = strlen(method_name);
2165 // check if we need to truncate the string
2166 if (s1len + s2len + 2 > maxLen) {
2168 // the strategy is to lop off the leading characters of the
2169 // class name and the trailing characters of the method name.
2171 if (s2len + 2 > maxLen) {
2172 // lop of the entire class name string, let snprintf handle
2173 // truncation of the method name.
2174 class_name += s1len; // null string
2175 }
2176 else {
2177 // lop off the extra characters from the front of the class name
2178 class_name += ((s1len + s2len + 2) - maxLen);
2179 }
2180 }
2182 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2183 }
2185 if (CICountOSR && is_osr) {
2186 _last_compile_type = osr_compile;
2187 } else {
2188 _last_compile_type = normal_compile;
2189 }
2190 _last_compile_level = comp_level;
2192 if (UsePerfData) {
2193 CompilerCounters* counters = thread->counters();
2194 counters->set_current_method(current_method);
2195 counters->set_compile_type((jlong)_last_compile_type);
2196 }
2197 }
2200 // ------------------------------------------------------------------
2201 // CompileBroker::push_jni_handle_block
2202 //
2203 // Push on a new block of JNI handles.
2204 void CompileBroker::push_jni_handle_block() {
2205 JavaThread* thread = JavaThread::current();
2207 // Allocate a new block for JNI handles.
2208 // Inlined code from jni_PushLocalFrame()
2209 JNIHandleBlock* java_handles = thread->active_handles();
2210 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2211 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2212 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2213 thread->set_active_handles(compile_handles);
2214 }
2217 // ------------------------------------------------------------------
2218 // CompileBroker::pop_jni_handle_block
2219 //
2220 // Pop off the current block of JNI handles.
2221 void CompileBroker::pop_jni_handle_block() {
2222 JavaThread* thread = JavaThread::current();
2224 // Release our JNI handle block
2225 JNIHandleBlock* compile_handles = thread->active_handles();
2226 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2227 thread->set_active_handles(java_handles);
2228 compile_handles->set_pop_frame_link(NULL);
2229 JNIHandleBlock::release_block(compile_handles, thread); // may block
2230 }
2233 // ------------------------------------------------------------------
2234 // CompileBroker::check_break_at
2235 //
2236 // Should the compilation break at the current compilation.
2237 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2238 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2239 return true;
2240 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2241 return true;
2242 } else {
2243 return (compile_id == CIBreakAt);
2244 }
2245 }
2247 // ------------------------------------------------------------------
2248 // CompileBroker::collect_statistics
2249 //
2250 // Collect statistics about the compilation.
2252 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2253 bool success = task->is_success();
2254 methodHandle method (thread, task->method());
2255 uint compile_id = task->compile_id();
2256 bool is_osr = (task->osr_bci() != standard_entry_bci);
2257 nmethod* code = task->code();
2258 CompilerCounters* counters = thread->counters();
2260 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2261 MutexLocker locker(CompileStatistics_lock);
2263 // _perf variables are production performance counters which are
2264 // updated regardless of the setting of the CITime and CITimeEach flags
2265 //
2266 if (!success) {
2267 _total_bailout_count++;
2268 if (UsePerfData) {
2269 _perf_last_failed_method->set_value(counters->current_method());
2270 _perf_last_failed_type->set_value(counters->compile_type());
2271 _perf_total_bailout_count->inc();
2272 }
2273 } else if (code == NULL) {
2274 if (UsePerfData) {
2275 _perf_last_invalidated_method->set_value(counters->current_method());
2276 _perf_last_invalidated_type->set_value(counters->compile_type());
2277 _perf_total_invalidated_count->inc();
2278 }
2279 _total_invalidated_count++;
2280 } else {
2281 // Compilation succeeded
2283 // update compilation ticks - used by the implementation of
2284 // java.lang.management.CompilationMBean
2285 _perf_total_compilation->inc(time.ticks());
2287 _t_total_compilation.add(time);
2288 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2290 if (CITime) {
2291 if (is_osr) {
2292 _t_osr_compilation.add(time);
2293 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2294 } else {
2295 _t_standard_compilation.add(time);
2296 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2297 }
2298 }
2300 if (UsePerfData) {
2301 // save the name of the last method compiled
2302 _perf_last_method->set_value(counters->current_method());
2303 _perf_last_compile_type->set_value(counters->compile_type());
2304 _perf_last_compile_size->set_value(method->code_size() +
2305 task->num_inlined_bytecodes());
2306 if (is_osr) {
2307 _perf_osr_compilation->inc(time.ticks());
2308 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2309 } else {
2310 _perf_standard_compilation->inc(time.ticks());
2311 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2312 }
2313 }
2315 if (CITimeEach) {
2316 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2317 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2318 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2319 }
2321 // Collect counts of successful compilations
2322 _sum_nmethod_size += code->total_size();
2323 _sum_nmethod_code_size += code->insts_size();
2324 _total_compile_count++;
2326 if (UsePerfData) {
2327 _perf_sum_nmethod_size->inc( code->total_size());
2328 _perf_sum_nmethod_code_size->inc(code->insts_size());
2329 _perf_total_compile_count->inc();
2330 }
2332 if (is_osr) {
2333 if (UsePerfData) _perf_total_osr_compile_count->inc();
2334 _total_osr_compile_count++;
2335 } else {
2336 if (UsePerfData) _perf_total_standard_compile_count->inc();
2337 _total_standard_compile_count++;
2338 }
2339 }
2340 // set the current method for the thread to null
2341 if (UsePerfData) counters->set_current_method("");
2342 }
2344 const char* CompileBroker::compiler_name(int comp_level) {
2345 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2346 if (comp == NULL) {
2347 return "no compiler";
2348 } else {
2349 return (comp->name());
2350 }
2351 }
2353 void CompileBroker::print_times() {
2354 tty->cr();
2355 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2356 tty->print_cr("------------------------------------------------");
2357 //0000000000111111111122222222223333333333444444444455555555556666666666
2358 //0123456789012345678901234567890123456789012345678901234567890123456789
2359 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2360 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2361 CompileBroker::_t_standard_compilation.seconds(),
2362 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2363 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);
2365 AbstractCompiler *comp = compiler(CompLevel_simple);
2366 if (comp != NULL) {
2367 comp->print_timers();
2368 }
2369 comp = compiler(CompLevel_full_optimization);
2370 if (comp != NULL) {
2371 comp->print_timers();
2372 }
2373 tty->cr();
2374 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2375 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2376 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2377 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2378 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2379 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2380 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2381 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2382 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2383 tty->cr();
2384 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2385 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2386 }
2388 // Debugging output for failure
2389 void CompileBroker::print_last_compile() {
2390 if ( _last_compile_level != CompLevel_none &&
2391 compiler(_last_compile_level) != NULL &&
2392 _last_method_compiled != NULL &&
2393 _last_compile_type != no_compile) {
2394 if (_last_compile_type == osr_compile) {
2395 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2396 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2397 } else {
2398 tty->print_cr("Last parse: %d+++(%d) %s",
2399 _compilation_id, _last_compile_level, _last_method_compiled);
2400 }
2401 }
2402 }
2405 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2406 #ifndef PRODUCT
2407 st->print_cr("Compiler thread printing unimplemented.");
2408 st->cr();
2409 #endif
2410 }