Thu, 09 May 2019 18:38:42 -0700
8223537: testlibrary_tests/ctw/ClassesListTest.java fails with Agent timeout frequently
Reviewed-by: thartmann, kvn
1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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 {
682 // Wake up thread that blocks on the compile task.
683 MutexLocker ct_lock(current->lock());
684 current->lock()->notify();
685 }
686 // Put the task back on the freelist.
687 CompileTask::free(current);
688 }
689 _first = NULL;
691 // Wake up all threads that block on the queue.
692 lock()->notify_all();
693 }
695 // ------------------------------------------------------------------
696 // CompileQueue::get
697 //
698 // Get the next CompileTask from a CompileQueue
699 CompileTask* CompileQueue::get() {
700 NMethodSweeper::possibly_sweep();
702 MutexLocker locker(lock());
703 // If _first is NULL we have no more compile jobs. There are two reasons for
704 // having no compile jobs: First, we compiled everything we wanted. Second,
705 // we ran out of code cache so compilation has been disabled. In the latter
706 // case we perform code cache sweeps to free memory such that we can re-enable
707 // compilation.
708 while (_first == NULL) {
709 // Exit loop if compilation is disabled forever
710 if (CompileBroker::is_compilation_disabled_forever()) {
711 return NULL;
712 }
714 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
715 // Wait a certain amount of time to possibly do another sweep.
716 // We must wait until stack scanning has happened so that we can
717 // transition a method's state from 'not_entrant' to 'zombie'.
718 long wait_time = NmethodSweepCheckInterval * 1000;
719 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
720 // Only one thread at a time can do sweeping. Scale the
721 // wait time according to the number of compiler threads.
722 // As a result, the next sweep is likely to happen every 100ms
723 // with an arbitrary number of threads that do sweeping.
724 wait_time = 100 * CICompilerCount;
725 }
726 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
727 if (timeout) {
728 MutexUnlocker ul(lock());
729 NMethodSweeper::possibly_sweep();
730 }
731 } else {
732 // If there are no compilation tasks and we can compile new jobs
733 // (i.e., there is enough free space in the code cache) there is
734 // no need to invoke the sweeper. As a result, the hotness of methods
735 // remains unchanged. This behavior is desired, since we want to keep
736 // the stable state, i.e., we do not want to evict methods from the
737 // code cache if it is unnecessary.
738 // We need a timed wait here, since compiler threads can exit if compilation
739 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
740 // is not critical and we do not want idle compiler threads to wake up too often.
741 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
742 }
743 }
745 if (CompileBroker::is_compilation_disabled_forever()) {
746 return NULL;
747 }
749 CompileTask* task;
750 {
751 No_Safepoint_Verifier nsv;
752 task = CompilationPolicy::policy()->select_task(this);
753 }
754 if (task != NULL) {
755 remove(task);
756 }
757 purge_stale_tasks(); // may temporarily release MCQ lock
758 return task;
759 }
761 // Clean & deallocate stale compile tasks.
762 // Temporarily releases MethodCompileQueue lock.
763 void CompileQueue::purge_stale_tasks() {
764 assert(lock()->owned_by_self(), "must own lock");
765 if (_first_stale != NULL) {
766 // Stale tasks are purged when MCQ lock is released,
767 // but _first_stale updates are protected by MCQ lock.
768 // Once task processing starts and MCQ lock is released,
769 // other compiler threads can reuse _first_stale.
770 CompileTask* head = _first_stale;
771 _first_stale = NULL;
772 {
773 MutexUnlocker ul(lock());
774 for (CompileTask* task = head; task != NULL; ) {
775 CompileTask* next_task = task->next();
776 CompileTaskWrapper ctw(task); // Frees the task
777 task->set_failure_reason("stale task");
778 task = next_task;
779 }
780 }
781 }
782 }
784 void CompileQueue::remove(CompileTask* task) {
785 assert(lock()->owned_by_self(), "must own lock");
786 if (task->prev() != NULL) {
787 task->prev()->set_next(task->next());
788 } else {
789 // max is the first element
790 assert(task == _first, "Sanity");
791 _first = task->next();
792 }
794 if (task->next() != NULL) {
795 task->next()->set_prev(task->prev());
796 } else {
797 // max is the last element
798 assert(task == _last, "Sanity");
799 _last = task->prev();
800 }
801 --_size;
802 }
804 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
805 assert(lock()->owned_by_self(), "must own lock");
806 remove(task);
808 // Enqueue the task for reclamation (should be done outside MCQ lock)
809 task->set_next(_first_stale);
810 task->set_prev(NULL);
811 _first_stale = task;
812 }
814 // methods in the compile queue need to be marked as used on the stack
815 // so that they don't get reclaimed by Redefine Classes
816 void CompileQueue::mark_on_stack() {
817 CompileTask* task = _first;
818 while (task != NULL) {
819 task->mark_on_stack();
820 task = task->next();
821 }
822 }
824 #ifndef PRODUCT
825 /**
826 * Print entire compilation queue.
827 */
828 void CompileQueue::print() {
829 if (CIPrintCompileQueue) {
830 ttyLocker ttyl;
831 tty->print_cr("Contents of %s", name());
832 tty->print_cr("----------------------");
833 CompileTask* task = _first;
834 while (task != NULL) {
835 task->print_line();
836 task = task->next();
837 }
838 tty->print_cr("----------------------");
839 }
840 }
841 #endif // PRODUCT
843 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
845 _current_method[0] = '\0';
846 _compile_type = CompileBroker::no_compile;
848 if (UsePerfData) {
849 ResourceMark rm;
851 // create the thread instance name space string - don't create an
852 // instance subspace if instance is -1 - keeps the adapterThread
853 // counters from having a ".0" namespace.
854 const char* thread_i = (instance == -1) ? thread_name :
855 PerfDataManager::name_space(thread_name, instance);
858 char* name = PerfDataManager::counter_name(thread_i, "method");
859 _perf_current_method =
860 PerfDataManager::create_string_variable(SUN_CI, name,
861 cmname_buffer_length,
862 _current_method, CHECK);
864 name = PerfDataManager::counter_name(thread_i, "type");
865 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
866 PerfData::U_None,
867 (jlong)_compile_type,
868 CHECK);
870 name = PerfDataManager::counter_name(thread_i, "time");
871 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
872 PerfData::U_Ticks, CHECK);
874 name = PerfDataManager::counter_name(thread_i, "compiles");
875 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
876 PerfData::U_Events, CHECK);
877 }
878 }
880 // ------------------------------------------------------------------
881 // CompileBroker::compilation_init
882 //
883 // Initialize the Compilation object
884 void CompileBroker::compilation_init() {
885 _last_method_compiled[0] = '\0';
887 // No need to initialize compilation system if we do not use it.
888 if (!UseCompiler) {
889 return;
890 }
891 #ifndef SHARK
892 // Set the interface to the current compiler(s).
893 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
894 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
895 #ifdef COMPILER1
896 if (c1_count > 0) {
897 _compilers[0] = new Compiler();
898 }
899 #endif // COMPILER1
901 #ifdef COMPILER2
902 if (c2_count > 0) {
903 _compilers[1] = new C2Compiler();
904 }
905 #endif // COMPILER2
907 #else // SHARK
908 int c1_count = 0;
909 int c2_count = 1;
911 _compilers[1] = new SharkCompiler();
912 #endif // SHARK
914 // Start the CompilerThreads
915 init_compiler_threads(c1_count, c2_count);
916 // totalTime performance counter is always created as it is required
917 // by the implementation of java.lang.management.CompilationMBean.
918 {
919 EXCEPTION_MARK;
920 _perf_total_compilation =
921 PerfDataManager::create_counter(JAVA_CI, "totalTime",
922 PerfData::U_Ticks, CHECK);
923 }
926 if (UsePerfData) {
928 EXCEPTION_MARK;
930 // create the jvmstat performance counters
931 _perf_osr_compilation =
932 PerfDataManager::create_counter(SUN_CI, "osrTime",
933 PerfData::U_Ticks, CHECK);
935 _perf_standard_compilation =
936 PerfDataManager::create_counter(SUN_CI, "standardTime",
937 PerfData::U_Ticks, CHECK);
939 _perf_total_bailout_count =
940 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
941 PerfData::U_Events, CHECK);
943 _perf_total_invalidated_count =
944 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
945 PerfData::U_Events, CHECK);
947 _perf_total_compile_count =
948 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
949 PerfData::U_Events, CHECK);
950 _perf_total_osr_compile_count =
951 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
952 PerfData::U_Events, CHECK);
954 _perf_total_standard_compile_count =
955 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
956 PerfData::U_Events, CHECK);
958 _perf_sum_osr_bytes_compiled =
959 PerfDataManager::create_counter(SUN_CI, "osrBytes",
960 PerfData::U_Bytes, CHECK);
962 _perf_sum_standard_bytes_compiled =
963 PerfDataManager::create_counter(SUN_CI, "standardBytes",
964 PerfData::U_Bytes, CHECK);
966 _perf_sum_nmethod_size =
967 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
968 PerfData::U_Bytes, CHECK);
970 _perf_sum_nmethod_code_size =
971 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
972 PerfData::U_Bytes, CHECK);
974 _perf_last_method =
975 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
976 CompilerCounters::cmname_buffer_length,
977 "", CHECK);
979 _perf_last_failed_method =
980 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
981 CompilerCounters::cmname_buffer_length,
982 "", CHECK);
984 _perf_last_invalidated_method =
985 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
986 CompilerCounters::cmname_buffer_length,
987 "", CHECK);
989 _perf_last_compile_type =
990 PerfDataManager::create_variable(SUN_CI, "lastType",
991 PerfData::U_None,
992 (jlong)CompileBroker::no_compile,
993 CHECK);
995 _perf_last_compile_size =
996 PerfDataManager::create_variable(SUN_CI, "lastSize",
997 PerfData::U_Bytes,
998 (jlong)CompileBroker::no_compile,
999 CHECK);
1002 _perf_last_failed_type =
1003 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
1004 PerfData::U_None,
1005 (jlong)CompileBroker::no_compile,
1006 CHECK);
1008 _perf_last_invalidated_type =
1009 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1010 PerfData::U_None,
1011 (jlong)CompileBroker::no_compile,
1012 CHECK);
1013 }
1015 _initialized = true;
1016 }
1019 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1020 AbstractCompiler* comp, TRAPS) {
1021 CompilerThread* compiler_thread = NULL;
1023 Klass* k =
1024 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1025 true, CHECK_0);
1026 instanceKlassHandle klass (THREAD, k);
1027 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1028 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1030 // Initialize thread_oop to put it into the system threadGroup
1031 Handle thread_group (THREAD, Universe::system_thread_group());
1032 JavaValue result(T_VOID);
1033 JavaCalls::call_special(&result, thread_oop,
1034 klass,
1035 vmSymbols::object_initializer_name(),
1036 vmSymbols::threadgroup_string_void_signature(),
1037 thread_group,
1038 string,
1039 CHECK_0);
1041 {
1042 MutexLocker mu(Threads_lock, THREAD);
1043 compiler_thread = new CompilerThread(queue, counters);
1044 // At this point the new CompilerThread data-races with this startup
1045 // thread (which I believe is the primoridal thread and NOT the VM
1046 // thread). This means Java bytecodes being executed at startup can
1047 // queue compile jobs which will run at whatever default priority the
1048 // newly created CompilerThread runs at.
1051 // At this point it may be possible that no osthread was created for the
1052 // JavaThread due to lack of memory. We would have to throw an exception
1053 // in that case. However, since this must work and we do not allow
1054 // exceptions anyway, check and abort if this fails.
1056 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1057 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1058 "unable to create new native thread");
1059 }
1061 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1063 // Note that this only sets the JavaThread _priority field, which by
1064 // definition is limited to Java priorities and not OS priorities.
1065 // The os-priority is set in the CompilerThread startup code itself
1067 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1069 // Note that we cannot call os::set_priority because it expects Java
1070 // priorities and we are *explicitly* using OS priorities so that it's
1071 // possible to set the compiler thread priority higher than any Java
1072 // thread.
1074 int native_prio = CompilerThreadPriority;
1075 if (native_prio == -1) {
1076 if (UseCriticalCompilerThreadPriority) {
1077 native_prio = os::java_to_os_priority[CriticalPriority];
1078 } else {
1079 native_prio = os::java_to_os_priority[NearMaxPriority];
1080 }
1081 }
1082 os::set_native_priority(compiler_thread, native_prio);
1084 java_lang_Thread::set_daemon(thread_oop());
1086 compiler_thread->set_threadObj(thread_oop());
1087 compiler_thread->set_compiler(comp);
1088 Threads::add(compiler_thread);
1089 Thread::start(compiler_thread);
1090 }
1092 // Let go of Threads_lock before yielding
1093 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1095 return compiler_thread;
1096 }
1099 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1100 EXCEPTION_MARK;
1101 #if !defined(ZERO) && !defined(SHARK)
1102 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1103 #endif // !ZERO && !SHARK
1104 // Initialize the compilation queue
1105 if (c2_compiler_count > 0) {
1106 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1107 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1108 }
1109 if (c1_compiler_count > 0) {
1110 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1111 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1112 }
1114 int compiler_count = c1_compiler_count + c2_compiler_count;
1116 _compiler_threads =
1117 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1119 char name_buffer[256];
1120 for (int i = 0; i < c2_compiler_count; i++) {
1121 // Create a name for our thread.
1122 sprintf(name_buffer, "C2 CompilerThread%d", i);
1123 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1124 // Shark and C2
1125 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1126 _compiler_threads->append(new_thread);
1127 }
1129 for (int i = c2_compiler_count; i < compiler_count; i++) {
1130 // Create a name for our thread.
1131 sprintf(name_buffer, "C1 CompilerThread%d", i);
1132 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1133 // C1
1134 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1135 _compiler_threads->append(new_thread);
1136 }
1138 if (UsePerfData) {
1139 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1140 }
1141 }
1144 /**
1145 * Set the methods on the stack as on_stack so that redefine classes doesn't
1146 * reclaim them. This method is executed at a safepoint.
1147 */
1148 void CompileBroker::mark_on_stack() {
1149 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1150 // Since we are at a safepoint, we do not need a lock to access
1151 // the compile queues.
1152 if (_c2_compile_queue != NULL) {
1153 _c2_compile_queue->mark_on_stack();
1154 }
1155 if (_c1_compile_queue != NULL) {
1156 _c1_compile_queue->mark_on_stack();
1157 }
1158 }
1160 // ------------------------------------------------------------------
1161 // CompileBroker::compile_method
1162 //
1163 // Request compilation of a method.
1164 void CompileBroker::compile_method_base(methodHandle method,
1165 int osr_bci,
1166 int comp_level,
1167 methodHandle hot_method,
1168 int hot_count,
1169 const char* comment,
1170 Thread* thread) {
1171 // do nothing if compiler thread(s) is not available
1172 if (!_initialized) {
1173 return;
1174 }
1176 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1177 assert(method->method_holder()->oop_is_instance(),
1178 "sanity check");
1179 assert(!method->method_holder()->is_not_initialized(),
1180 "method holder must be initialized");
1181 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1183 if (CIPrintRequests) {
1184 tty->print("request: ");
1185 method->print_short_name(tty);
1186 if (osr_bci != InvocationEntryBci) {
1187 tty->print(" osr_bci: %d", osr_bci);
1188 }
1189 tty->print(" comment: %s count: %d", comment, hot_count);
1190 if (!hot_method.is_null()) {
1191 tty->print(" hot: ");
1192 if (hot_method() != method()) {
1193 hot_method->print_short_name(tty);
1194 } else {
1195 tty->print("yes");
1196 }
1197 }
1198 tty->cr();
1199 }
1201 // A request has been made for compilation. Before we do any
1202 // real work, check to see if the method has been compiled
1203 // in the meantime with a definitive result.
1204 if (compilation_is_complete(method, osr_bci, comp_level)) {
1205 return;
1206 }
1208 #ifndef PRODUCT
1209 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1210 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1211 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1212 return;
1213 }
1214 }
1215 #endif
1217 // If this method is already in the compile queue, then
1218 // we do not block the current thread.
1219 if (compilation_is_in_queue(method)) {
1220 // We may want to decay our counter a bit here to prevent
1221 // multiple denied requests for compilation. This is an
1222 // open compilation policy issue. Note: The other possibility,
1223 // in the case that this is a blocking compile request, is to have
1224 // all subsequent blocking requesters wait for completion of
1225 // ongoing compiles. Note that in this case we'll need a protocol
1226 // for freeing the associated compile tasks. [Or we could have
1227 // a single static monitor on which all these waiters sleep.]
1228 return;
1229 }
1231 // If the requesting thread is holding the pending list lock
1232 // then we just return. We can't risk blocking while holding
1233 // the pending list lock or a 3-way deadlock may occur
1234 // between the reference handler thread, a GC (instigated
1235 // by a compiler thread), and compiled method registration.
1236 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1237 return;
1238 }
1240 if (TieredCompilation) {
1241 // Tiered policy requires MethodCounters to exist before adding a method to
1242 // the queue. Create if we don't have them yet.
1243 method->get_method_counters(thread);
1244 }
1246 // Outputs from the following MutexLocker block:
1247 CompileTask* task = NULL;
1248 bool blocking = false;
1249 CompileQueue* queue = compile_queue(comp_level);
1251 // Acquire our lock.
1252 {
1253 MutexLocker locker(queue->lock(), thread);
1255 // Make sure the method has not slipped into the queues since
1256 // last we checked; note that those checks were "fast bail-outs".
1257 // Here we need to be more careful, see 14012000 below.
1258 if (compilation_is_in_queue(method)) {
1259 return;
1260 }
1262 // We need to check again to see if the compilation has
1263 // completed. A previous compilation may have registered
1264 // some result.
1265 if (compilation_is_complete(method, osr_bci, comp_level)) {
1266 return;
1267 }
1269 // We now know that this compilation is not pending, complete,
1270 // or prohibited. Assign a compile_id to this compilation
1271 // and check to see if it is in our [Start..Stop) range.
1272 int compile_id = assign_compile_id(method, osr_bci);
1273 if (compile_id == 0) {
1274 // The compilation falls outside the allowed range.
1275 return;
1276 }
1278 // Should this thread wait for completion of the compile?
1279 blocking = is_compile_blocking();
1281 // We will enter the compilation in the queue.
1282 // 14012000: Note that this sets the queued_for_compile bits in
1283 // the target method. We can now reason that a method cannot be
1284 // queued for compilation more than once, as follows:
1285 // Before a thread queues a task for compilation, it first acquires
1286 // the compile queue lock, then checks if the method's queued bits
1287 // are set or it has already been compiled. Thus there can not be two
1288 // instances of a compilation task for the same method on the
1289 // compilation queue. Consider now the case where the compilation
1290 // thread has already removed a task for that method from the queue
1291 // and is in the midst of compiling it. In this case, the
1292 // queued_for_compile bits must be set in the method (and these
1293 // will be visible to the current thread, since the bits were set
1294 // under protection of the compile queue lock, which we hold now.
1295 // When the compilation completes, the compiler thread first sets
1296 // the compilation result and then clears the queued_for_compile
1297 // bits. Neither of these actions are protected by a barrier (or done
1298 // under the protection of a lock), so the only guarantee we have
1299 // (on machines with TSO (Total Store Order)) is that these values
1300 // will update in that order. As a result, the only combinations of
1301 // these bits that the current thread will see are, in temporal order:
1302 // <RESULT, QUEUE> :
1303 // <0, 1> : in compile queue, but not yet compiled
1304 // <1, 1> : compiled but queue bit not cleared
1305 // <1, 0> : compiled and queue bit cleared
1306 // Because we first check the queue bits then check the result bits,
1307 // we are assured that we cannot introduce a duplicate task.
1308 // Note that if we did the tests in the reverse order (i.e. check
1309 // result then check queued bit), we could get the result bit before
1310 // the compilation completed, and the queue bit after the compilation
1311 // completed, and end up introducing a "duplicate" (redundant) task.
1312 // In that case, the compiler thread should first check if a method
1313 // has already been compiled before trying to compile it.
1314 // NOTE: in the event that there are multiple compiler threads and
1315 // there is de-optimization/recompilation, things will get hairy,
1316 // and in that case it's best to protect both the testing (here) of
1317 // these bits, and their updating (here and elsewhere) under a
1318 // common lock.
1319 task = create_compile_task(queue,
1320 compile_id, method,
1321 osr_bci, comp_level,
1322 hot_method, hot_count, comment,
1323 blocking);
1324 }
1326 if (blocking) {
1327 wait_for_completion(task);
1328 }
1329 }
1332 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1333 int comp_level,
1334 methodHandle hot_method, int hot_count,
1335 const char* comment, Thread* THREAD) {
1336 // make sure arguments make sense
1337 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1338 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1339 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1340 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1341 // allow any levels for WhiteBox
1342 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1343 // return quickly if possible
1345 // lock, make sure that the compilation
1346 // isn't prohibited in a straightforward way.
1347 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1348 if (comp == NULL || !comp->can_compile_method(method) ||
1349 compilation_is_prohibited(method, osr_bci, comp_level)) {
1350 return NULL;
1351 }
1353 if (osr_bci == InvocationEntryBci) {
1354 // standard compilation
1355 nmethod* method_code = method->code();
1356 if (method_code != NULL) {
1357 if (compilation_is_complete(method, osr_bci, comp_level)) {
1358 return method_code;
1359 }
1360 }
1361 if (method->is_not_compilable(comp_level)) {
1362 return NULL;
1363 }
1364 } else {
1365 // osr compilation
1366 #ifndef TIERED
1367 // seems like an assert of dubious value
1368 assert(comp_level == CompLevel_highest_tier,
1369 "all OSR compiles are assumed to be at a single compilation lavel");
1370 #endif // TIERED
1371 // We accept a higher level osr method
1372 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1373 if (nm != NULL) return nm;
1374 if (method->is_not_osr_compilable(comp_level)) return NULL;
1375 }
1377 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1378 // some prerequisites that are compiler specific
1379 if (comp->is_c2() || comp->is_shark()) {
1380 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1381 // Resolve all classes seen in the signature of the method
1382 // we are compiling.
1383 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1384 }
1386 // If the method is native, do the lookup in the thread requesting
1387 // the compilation. Native lookups can load code, which is not
1388 // permitted during compilation.
1389 //
1390 // Note: A native method implies non-osr compilation which is
1391 // checked with an assertion at the entry of this method.
1392 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1393 bool in_base_library;
1394 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1395 if (HAS_PENDING_EXCEPTION) {
1396 // In case of an exception looking up the method, we just forget
1397 // about it. The interpreter will kick-in and throw the exception.
1398 method->set_not_compilable(); // implies is_not_osr_compilable()
1399 CLEAR_PENDING_EXCEPTION;
1400 return NULL;
1401 }
1402 assert(method->has_native_function(), "must have native code by now");
1403 }
1405 // RedefineClasses() has replaced this method; just return
1406 if (method->is_old()) {
1407 return NULL;
1408 }
1410 // JVMTI -- post_compile_event requires jmethod_id() that may require
1411 // a lock the compiling thread can not acquire. Prefetch it here.
1412 if (JvmtiExport::should_post_compiled_method_load()) {
1413 method->jmethod_id();
1414 }
1416 // do the compilation
1417 if (method->is_native()) {
1418 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1419 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1420 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1421 //
1422 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1423 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1424 AdapterHandlerLibrary::create_native_wrapper(method);
1425 } else {
1426 return NULL;
1427 }
1428 } else {
1429 // If the compiler is shut off due to code cache getting full
1430 // fail out now so blocking compiles dont hang the java thread
1431 if (!should_compile_new_jobs()) {
1432 CompilationPolicy::policy()->delay_compilation(method());
1433 return NULL;
1434 }
1435 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1436 }
1438 // return requested nmethod
1439 // We accept a higher level osr method
1440 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1441 }
1444 // ------------------------------------------------------------------
1445 // CompileBroker::compilation_is_complete
1446 //
1447 // See if compilation of this method is already complete.
1448 bool CompileBroker::compilation_is_complete(methodHandle method,
1449 int osr_bci,
1450 int comp_level) {
1451 bool is_osr = (osr_bci != standard_entry_bci);
1452 if (is_osr) {
1453 if (method->is_not_osr_compilable(comp_level)) {
1454 return true;
1455 } else {
1456 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1457 return (result != NULL);
1458 }
1459 } else {
1460 if (method->is_not_compilable(comp_level)) {
1461 return true;
1462 } else {
1463 nmethod* result = method->code();
1464 if (result == NULL) return false;
1465 return comp_level == result->comp_level();
1466 }
1467 }
1468 }
1471 /**
1472 * See if this compilation is already requested.
1473 *
1474 * Implementation note: there is only a single "is in queue" bit
1475 * for each method. This means that the check below is overly
1476 * conservative in the sense that an osr compilation in the queue
1477 * will block a normal compilation from entering the queue (and vice
1478 * versa). This can be remedied by a full queue search to disambiguate
1479 * cases. If it is deemed profitable, this may be done.
1480 */
1481 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1482 return method->queued_for_compilation();
1483 }
1485 // ------------------------------------------------------------------
1486 // CompileBroker::compilation_is_prohibited
1487 //
1488 // See if this compilation is not allowed.
1489 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1490 bool is_native = method->is_native();
1491 // Some compilers may not support the compilation of natives.
1492 AbstractCompiler *comp = compiler(comp_level);
1493 if (is_native &&
1494 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1495 method->set_not_compilable_quietly(comp_level);
1496 return true;
1497 }
1499 bool is_osr = (osr_bci != standard_entry_bci);
1500 // Some compilers may not support on stack replacement.
1501 if (is_osr &&
1502 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1503 method->set_not_osr_compilable(comp_level);
1504 return true;
1505 }
1507 // The method may be explicitly excluded by the user.
1508 bool quietly;
1509 if (CompilerOracle::should_exclude(method, quietly)) {
1510 if (!quietly) {
1511 // This does not happen quietly...
1512 ResourceMark rm;
1513 tty->print("### Excluding %s:%s",
1514 method->is_native() ? "generation of native wrapper" : "compile",
1515 (method->is_static() ? " static" : ""));
1516 method->print_short_name(tty);
1517 tty->cr();
1518 }
1519 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1520 }
1522 return false;
1523 }
1525 /**
1526 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1527 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1528 * The function also allows to generate separate compilation IDs for OSR compilations.
1529 */
1530 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1531 #ifdef ASSERT
1532 bool is_osr = (osr_bci != standard_entry_bci);
1533 int id;
1534 if (method->is_native()) {
1535 assert(!is_osr, "can't be osr");
1536 // Adapters, native wrappers and method handle intrinsics
1537 // should be generated always.
1538 return Atomic::add(1, &_compilation_id);
1539 } else if (CICountOSR && is_osr) {
1540 id = Atomic::add(1, &_osr_compilation_id);
1541 if (CIStartOSR <= id && id < CIStopOSR) {
1542 return id;
1543 }
1544 } else {
1545 id = Atomic::add(1, &_compilation_id);
1546 if (CIStart <= id && id < CIStop) {
1547 return id;
1548 }
1549 }
1551 // Method was not in the appropriate compilation range.
1552 method->set_not_compilable_quietly();
1553 return 0;
1554 #else
1555 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1556 // only _compilation_id is incremented.
1557 return Atomic::add(1, &_compilation_id);
1558 #endif
1559 }
1561 /**
1562 * Should the current thread block until this compilation request
1563 * has been fulfilled?
1564 */
1565 bool CompileBroker::is_compile_blocking() {
1566 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1567 return !BackgroundCompilation;
1568 }
1571 // ------------------------------------------------------------------
1572 // CompileBroker::preload_classes
1573 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1574 // Move this code over from c1_Compiler.cpp
1575 ShouldNotReachHere();
1576 }
1579 // ------------------------------------------------------------------
1580 // CompileBroker::create_compile_task
1581 //
1582 // Create a CompileTask object representing the current request for
1583 // compilation. Add this task to the queue.
1584 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1585 int compile_id,
1586 methodHandle method,
1587 int osr_bci,
1588 int comp_level,
1589 methodHandle hot_method,
1590 int hot_count,
1591 const char* comment,
1592 bool blocking) {
1593 CompileTask* new_task = CompileTask::allocate();
1594 new_task->initialize(compile_id, method, osr_bci, comp_level,
1595 hot_method, hot_count, comment,
1596 blocking);
1597 queue->add(new_task);
1598 return new_task;
1599 }
1602 /**
1603 * Wait for the compilation task to complete.
1604 */
1605 void CompileBroker::wait_for_completion(CompileTask* task) {
1606 if (CIPrintCompileQueue) {
1607 ttyLocker ttyl;
1608 tty->print_cr("BLOCKING FOR COMPILE");
1609 }
1611 assert(task->is_blocking(), "can only wait on blocking task");
1613 JavaThread* thread = JavaThread::current();
1614 thread->set_blocked_on_compilation(true);
1616 methodHandle method(thread, task->method());
1617 {
1618 MutexLocker waiter(task->lock(), thread);
1620 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1621 task->lock()->wait();
1622 }
1623 }
1625 thread->set_blocked_on_compilation(false);
1626 if (is_compilation_disabled_forever()) {
1627 CompileTask::free(task);
1628 return;
1629 }
1631 // It is harmless to check this status without the lock, because
1632 // completion is a stable property (until the task object is recycled).
1633 assert(task->is_complete(), "Compilation should have completed");
1634 assert(task->code_handle() == NULL, "must be reset");
1636 // By convention, the waiter is responsible for recycling a
1637 // blocking CompileTask. Since there is only one waiter ever
1638 // waiting on a CompileTask, we know that no one else will
1639 // be using this CompileTask; we can free it.
1640 CompileTask::free(task);
1641 }
1643 /**
1644 * Initialize compiler thread(s) + compiler object(s). The postcondition
1645 * of this function is that the compiler runtimes are initialized and that
1646 * compiler threads can start compiling.
1647 */
1648 bool CompileBroker::init_compiler_runtime() {
1649 CompilerThread* thread = CompilerThread::current();
1650 AbstractCompiler* comp = thread->compiler();
1651 // Final sanity check - the compiler object must exist
1652 guarantee(comp != NULL, "Compiler object must exist");
1654 int system_dictionary_modification_counter;
1655 {
1656 MutexLocker locker(Compile_lock, thread);
1657 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1658 }
1660 {
1661 // Must switch to native to allocate ci_env
1662 ThreadToNativeFromVM ttn(thread);
1663 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1664 // Cache Jvmti state
1665 ci_env.cache_jvmti_state();
1666 // Cache DTrace flags
1667 ci_env.cache_dtrace_flags();
1669 // Switch back to VM state to do compiler initialization
1670 ThreadInVMfromNative tv(thread);
1671 ResetNoHandleMark rnhm;
1674 if (!comp->is_shark()) {
1675 // Perform per-thread and global initializations
1676 comp->initialize();
1677 }
1678 }
1680 if (comp->is_failed()) {
1681 disable_compilation_forever();
1682 // If compiler initialization failed, no compiler thread that is specific to a
1683 // particular compiler runtime will ever start to compile methods.
1684 shutdown_compiler_runtime(comp, thread);
1685 return false;
1686 }
1688 // C1 specific check
1689 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1690 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1691 return false;
1692 }
1694 return true;
1695 }
1697 /**
1698 * If C1 and/or C2 initialization failed, we shut down all compilation.
1699 * We do this to keep things simple. This can be changed if it ever turns
1700 * out to be a problem.
1701 */
1702 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1703 // Free buffer blob, if allocated
1704 if (thread->get_buffer_blob() != NULL) {
1705 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1706 CodeCache::free(thread->get_buffer_blob());
1707 }
1709 if (comp->should_perform_shutdown()) {
1710 // There are two reasons for shutting down the compiler
1711 // 1) compiler runtime initialization failed
1712 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1713 warning("%s initialization failed. Shutting down all compilers", comp->name());
1715 // Only one thread per compiler runtime object enters here
1716 // Set state to shut down
1717 comp->set_shut_down();
1719 // Delete all queued compilation tasks to make compiler threads exit faster.
1720 if (_c1_compile_queue != NULL) {
1721 _c1_compile_queue->free_all();
1722 }
1724 if (_c2_compile_queue != NULL) {
1725 _c2_compile_queue->free_all();
1726 }
1728 // Set flags so that we continue execution with using interpreter only.
1729 UseCompiler = false;
1730 UseInterpreter = true;
1732 // We could delete compiler runtimes also. However, there are references to
1733 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1734 // fail. This can be done later if necessary.
1735 }
1736 }
1738 // ------------------------------------------------------------------
1739 // CompileBroker::compiler_thread_loop
1740 //
1741 // The main loop run by a CompilerThread.
1742 void CompileBroker::compiler_thread_loop() {
1743 CompilerThread* thread = CompilerThread::current();
1744 CompileQueue* queue = thread->queue();
1745 // For the thread that initializes the ciObjectFactory
1746 // this resource mark holds all the shared objects
1747 ResourceMark rm;
1749 // First thread to get here will initialize the compiler interface
1751 if (!ciObjectFactory::is_initialized()) {
1752 ASSERT_IN_VM;
1753 MutexLocker only_one (CompileThread_lock, thread);
1754 if (!ciObjectFactory::is_initialized()) {
1755 ciObjectFactory::initialize();
1756 }
1757 }
1759 // Open a log.
1760 if (LogCompilation) {
1761 init_compiler_thread_log();
1762 }
1763 CompileLog* log = thread->log();
1764 if (log != NULL) {
1765 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1766 thread->name(),
1767 os::current_thread_id(),
1768 os::current_process_id());
1769 log->stamp();
1770 log->end_elem();
1771 }
1773 // If compiler thread/runtime initialization fails, exit the compiler thread
1774 if (!init_compiler_runtime()) {
1775 return;
1776 }
1778 // Poll for new compilation tasks as long as the JVM runs. Compilation
1779 // should only be disabled if something went wrong while initializing the
1780 // compiler runtimes. This, in turn, should not happen. The only known case
1781 // when compiler runtime initialization fails is if there is not enough free
1782 // space in the code cache to generate the necessary stubs, etc.
1783 while (!is_compilation_disabled_forever()) {
1784 // We need this HandleMark to avoid leaking VM handles.
1785 HandleMark hm(thread);
1787 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1788 // the code cache is really full
1789 handle_full_code_cache();
1790 }
1792 CompileTask* task = queue->get();
1793 if (task == NULL) {
1794 continue;
1795 }
1797 // Give compiler threads an extra quanta. They tend to be bursty and
1798 // this helps the compiler to finish up the job.
1799 if( CompilerThreadHintNoPreempt )
1800 os::hint_no_preempt();
1802 // trace per thread time and compile statistics
1803 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1804 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1806 // Assign the task to the current thread. Mark this compilation
1807 // thread as active for the profiler.
1808 CompileTaskWrapper ctw(task);
1809 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1810 task->set_code_handle(&result_handle);
1811 methodHandle method(thread, task->method());
1813 // Never compile a method if breakpoints are present in it
1814 if (method()->number_of_breakpoints() == 0) {
1815 // Compile the method.
1816 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1817 invoke_compiler_on_method(task);
1818 } else {
1819 // After compilation is disabled, remove remaining methods from queue
1820 method->clear_queued_for_compilation();
1821 task->set_failure_reason("compilation is disabled");
1822 }
1823 }
1824 }
1826 // Shut down compiler runtime
1827 shutdown_compiler_runtime(thread->compiler(), thread);
1828 }
1830 // ------------------------------------------------------------------
1831 // CompileBroker::init_compiler_thread_log
1832 //
1833 // Set up state required by +LogCompilation.
1834 void CompileBroker::init_compiler_thread_log() {
1835 CompilerThread* thread = CompilerThread::current();
1836 char file_name[4*K];
1837 FILE* fp = NULL;
1838 intx thread_id = os::current_thread_id();
1839 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1840 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1841 if (dir == NULL) {
1842 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1843 thread_id, os::current_process_id());
1844 } else {
1845 jio_snprintf(file_name, sizeof(file_name),
1846 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1847 os::file_separator(), thread_id, os::current_process_id());
1848 }
1850 fp = fopen(file_name, "wt");
1851 if (fp != NULL) {
1852 if (LogCompilation && Verbose) {
1853 tty->print_cr("Opening compilation log %s", file_name);
1854 }
1855 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1856 if (log == NULL) {
1857 fclose(fp);
1858 return;
1859 }
1860 thread->init_log(log);
1862 if (xtty != NULL) {
1863 ttyLocker ttyl;
1864 // Record any per thread log files
1865 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1866 }
1867 return;
1868 }
1869 }
1870 warning("Cannot open log file: %s", file_name);
1871 }
1873 // ------------------------------------------------------------------
1874 // CompileBroker::set_should_block
1875 //
1876 // Set _should_block.
1877 // Call this from the VM, with Threads_lock held and a safepoint requested.
1878 void CompileBroker::set_should_block() {
1879 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1880 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1881 #ifndef PRODUCT
1882 if (PrintCompilation && (Verbose || WizardMode))
1883 tty->print_cr("notifying compiler thread pool to block");
1884 #endif
1885 _should_block = true;
1886 }
1888 // ------------------------------------------------------------------
1889 // CompileBroker::maybe_block
1890 //
1891 // Call this from the compiler at convenient points, to poll for _should_block.
1892 void CompileBroker::maybe_block() {
1893 if (_should_block) {
1894 #ifndef PRODUCT
1895 if (PrintCompilation && (Verbose || WizardMode))
1896 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1897 #endif
1898 ThreadInVMfromNative tivfn(JavaThread::current());
1899 }
1900 }
1902 // wrapper for CodeCache::print_summary()
1903 static void codecache_print(bool detailed)
1904 {
1905 ResourceMark rm;
1906 stringStream s;
1907 // Dump code cache into a buffer before locking the tty,
1908 {
1909 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1910 CodeCache::print_summary(&s, detailed);
1911 }
1912 ttyLocker ttyl;
1913 tty->print("%s", s.as_string());
1914 }
1916 // ------------------------------------------------------------------
1917 // CompileBroker::invoke_compiler_on_method
1918 //
1919 // Compile a method.
1920 //
1921 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1922 if (PrintCompilation) {
1923 ResourceMark rm;
1924 task->print_line();
1925 }
1926 elapsedTimer time;
1928 CompilerThread* thread = CompilerThread::current();
1929 ResourceMark rm(thread);
1931 if (LogEvents) {
1932 _compilation_log->log_compile(thread, task);
1933 }
1935 // Common flags.
1936 uint compile_id = task->compile_id();
1937 int osr_bci = task->osr_bci();
1938 bool is_osr = (osr_bci != standard_entry_bci);
1939 bool should_log = (thread->log() != NULL);
1940 bool should_break = false;
1941 int task_level = task->comp_level();
1942 {
1943 // create the handle inside it's own block so it can't
1944 // accidentally be referenced once the thread transitions to
1945 // native. The NoHandleMark before the transition should catch
1946 // any cases where this occurs in the future.
1947 methodHandle method(thread, task->method());
1948 should_break = check_break_at(method, compile_id, is_osr);
1949 if (should_log && !CompilerOracle::should_log(method)) {
1950 should_log = false;
1951 }
1952 assert(!method->is_native(), "no longer compile natives");
1954 // Save information about this method in case of failure.
1955 set_last_compile(thread, method, is_osr, task_level);
1957 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1958 }
1960 // Allocate a new set of JNI handles.
1961 push_jni_handle_block();
1962 Method* target_handle = task->method();
1963 int compilable = ciEnv::MethodCompilable;
1964 {
1965 int system_dictionary_modification_counter;
1966 {
1967 MutexLocker locker(Compile_lock, thread);
1968 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1969 }
1971 NoHandleMark nhm;
1972 ThreadToNativeFromVM ttn(thread);
1974 ciEnv ci_env(task, system_dictionary_modification_counter);
1975 if (should_break) {
1976 ci_env.set_break_at_compile(true);
1977 }
1978 if (should_log) {
1979 ci_env.set_log(thread->log());
1980 }
1981 assert(thread->env() == &ci_env, "set by ci_env");
1982 // The thread-env() field is cleared in ~CompileTaskWrapper.
1984 // Cache Jvmti state
1985 ci_env.cache_jvmti_state();
1987 // Cache DTrace flags
1988 ci_env.cache_dtrace_flags();
1990 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1992 TraceTime t1("compilation", &time);
1993 EventCompilation event;
1995 AbstractCompiler *comp = compiler(task_level);
1996 if (comp == NULL) {
1997 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1998 } else {
1999 comp->compile_method(&ci_env, target, osr_bci);
2000 }
2002 if (!ci_env.failing() && task->code() == NULL) {
2003 //assert(false, "compiler should always document failure");
2004 // The compiler elected, without comment, not to register a result.
2005 // Do not attempt further compilations of this method.
2006 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2007 }
2009 // Copy this bit to the enclosing block:
2010 compilable = ci_env.compilable();
2012 if (ci_env.failing()) {
2013 task->set_failure_reason(ci_env.failure_reason());
2014 const char* retry_message = ci_env.retry_message();
2015 if (_compilation_log != NULL) {
2016 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2017 }
2018 if (PrintCompilation) {
2019 FormatBufferResource msg = retry_message != NULL ?
2020 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2021 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2022 task->print_compilation(tty, msg);
2023 }
2024 } else {
2025 task->mark_success();
2026 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2027 if (_compilation_log != NULL) {
2028 nmethod* code = task->code();
2029 if (code != NULL) {
2030 _compilation_log->log_nmethod(thread, code);
2031 }
2032 }
2033 }
2034 // simulate crash during compilation
2035 assert(task->compile_id() != CICrashAt, "just as planned");
2036 if (event.should_commit()) {
2037 event.set_method(target->get_Method());
2038 event.set_compileID(compile_id);
2039 event.set_compileLevel(task->comp_level());
2040 event.set_succeded(task->is_success());
2041 event.set_isOsr(is_osr);
2042 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2043 event.set_inlinedBytes(task->num_inlined_bytecodes());
2044 event.commit();
2045 }
2046 }
2047 pop_jni_handle_block();
2049 methodHandle method(thread, task->method());
2051 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2053 collect_statistics(thread, time, task);
2055 if (PrintCompilation && PrintCompilation2) {
2056 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2057 tty->print("%4d ", compile_id); // print compilation number
2058 tty->print("%s ", (is_osr ? "%" : " "));
2059 if (task->code() != NULL) {
2060 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2061 }
2062 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2063 }
2065 if (PrintCodeCacheOnCompilation)
2066 codecache_print(/* detailed= */ false);
2068 // Disable compilation, if required.
2069 switch (compilable) {
2070 case ciEnv::MethodCompilable_never:
2071 if (is_osr)
2072 method->set_not_osr_compilable_quietly();
2073 else
2074 method->set_not_compilable_quietly();
2075 break;
2076 case ciEnv::MethodCompilable_not_at_tier:
2077 if (is_osr)
2078 method->set_not_osr_compilable_quietly(task_level);
2079 else
2080 method->set_not_compilable_quietly(task_level);
2081 break;
2082 }
2084 // Note that the queued_for_compilation bits are cleared without
2085 // protection of a mutex. [They were set by the requester thread,
2086 // when adding the task to the compile queue -- at which time the
2087 // compile queue lock was held. Subsequently, we acquired the compile
2088 // queue lock to get this task off the compile queue; thus (to belabour
2089 // the point somewhat) our clearing of the bits must be occurring
2090 // only after the setting of the bits. See also 14012000 above.
2091 method->clear_queued_for_compilation();
2093 #ifdef ASSERT
2094 if (CollectedHeap::fired_fake_oom()) {
2095 // The current compile received a fake OOM during compilation so
2096 // go ahead and exit the VM since the test apparently succeeded
2097 tty->print_cr("*** Shutting down VM after successful fake OOM");
2098 vm_exit(0);
2099 }
2100 #endif
2101 }
2103 /**
2104 * The CodeCache is full. Print out warning and disable compilation
2105 * or try code cache cleaning so compilation can continue later.
2106 */
2107 void CompileBroker::handle_full_code_cache() {
2108 UseInterpreter = true;
2109 if (UseCompiler || AlwaysCompileLoopMethods ) {
2110 if (xtty != NULL) {
2111 ResourceMark rm;
2112 stringStream s;
2113 // Dump code cache state into a buffer before locking the tty,
2114 // because log_state() will use locks causing lock conflicts.
2115 CodeCache::log_state(&s);
2116 // Lock to prevent tearing
2117 ttyLocker ttyl;
2118 xtty->begin_elem("code_cache_full");
2119 xtty->print("%s", s.as_string());
2120 xtty->stamp();
2121 xtty->end_elem();
2122 }
2124 CodeCache::report_codemem_full();
2126 #ifndef PRODUCT
2127 if (CompileTheWorld || ExitOnFullCodeCache) {
2128 codecache_print(/* detailed= */ true);
2129 before_exit(JavaThread::current());
2130 exit_globals(); // will delete tty
2131 vm_direct_exit(CompileTheWorld ? 0 : 1);
2132 }
2133 #endif
2134 if (UseCodeCacheFlushing) {
2135 // Since code cache is full, immediately stop new compiles
2136 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2137 NMethodSweeper::log_sweep("disable_compiler");
2138 }
2139 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2140 // without having to consider the state in which the current thread is.
2141 ThreadInVMfromUnknown in_vm;
2142 NMethodSweeper::possibly_sweep();
2143 } else {
2144 disable_compilation_forever();
2145 }
2147 // Print warning only once
2148 if (should_print_compiler_warning()) {
2149 warning("CodeCache is full. Compiler has been disabled.");
2150 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2151 codecache_print(/* detailed= */ true);
2152 }
2153 }
2154 }
2156 // ------------------------------------------------------------------
2157 // CompileBroker::set_last_compile
2158 //
2159 // Record this compilation for debugging purposes.
2160 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2161 ResourceMark rm;
2162 char* method_name = method->name()->as_C_string();
2163 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2164 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2165 char current_method[CompilerCounters::cmname_buffer_length];
2166 size_t maxLen = CompilerCounters::cmname_buffer_length;
2168 if (UsePerfData) {
2169 const char* class_name = method->method_holder()->name()->as_C_string();
2171 size_t s1len = strlen(class_name);
2172 size_t s2len = strlen(method_name);
2174 // check if we need to truncate the string
2175 if (s1len + s2len + 2 > maxLen) {
2177 // the strategy is to lop off the leading characters of the
2178 // class name and the trailing characters of the method name.
2180 if (s2len + 2 > maxLen) {
2181 // lop of the entire class name string, let snprintf handle
2182 // truncation of the method name.
2183 class_name += s1len; // null string
2184 }
2185 else {
2186 // lop off the extra characters from the front of the class name
2187 class_name += ((s1len + s2len + 2) - maxLen);
2188 }
2189 }
2191 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2192 }
2194 if (CICountOSR && is_osr) {
2195 _last_compile_type = osr_compile;
2196 } else {
2197 _last_compile_type = normal_compile;
2198 }
2199 _last_compile_level = comp_level;
2201 if (UsePerfData) {
2202 CompilerCounters* counters = thread->counters();
2203 counters->set_current_method(current_method);
2204 counters->set_compile_type((jlong)_last_compile_type);
2205 }
2206 }
2209 // ------------------------------------------------------------------
2210 // CompileBroker::push_jni_handle_block
2211 //
2212 // Push on a new block of JNI handles.
2213 void CompileBroker::push_jni_handle_block() {
2214 JavaThread* thread = JavaThread::current();
2216 // Allocate a new block for JNI handles.
2217 // Inlined code from jni_PushLocalFrame()
2218 JNIHandleBlock* java_handles = thread->active_handles();
2219 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2220 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2221 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2222 thread->set_active_handles(compile_handles);
2223 }
2226 // ------------------------------------------------------------------
2227 // CompileBroker::pop_jni_handle_block
2228 //
2229 // Pop off the current block of JNI handles.
2230 void CompileBroker::pop_jni_handle_block() {
2231 JavaThread* thread = JavaThread::current();
2233 // Release our JNI handle block
2234 JNIHandleBlock* compile_handles = thread->active_handles();
2235 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2236 thread->set_active_handles(java_handles);
2237 compile_handles->set_pop_frame_link(NULL);
2238 JNIHandleBlock::release_block(compile_handles, thread); // may block
2239 }
2242 // ------------------------------------------------------------------
2243 // CompileBroker::check_break_at
2244 //
2245 // Should the compilation break at the current compilation.
2246 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2247 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2248 return true;
2249 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2250 return true;
2251 } else {
2252 return (compile_id == CIBreakAt);
2253 }
2254 }
2256 // ------------------------------------------------------------------
2257 // CompileBroker::collect_statistics
2258 //
2259 // Collect statistics about the compilation.
2261 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2262 bool success = task->is_success();
2263 methodHandle method (thread, task->method());
2264 uint compile_id = task->compile_id();
2265 bool is_osr = (task->osr_bci() != standard_entry_bci);
2266 nmethod* code = task->code();
2267 CompilerCounters* counters = thread->counters();
2269 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2270 MutexLocker locker(CompileStatistics_lock);
2272 // _perf variables are production performance counters which are
2273 // updated regardless of the setting of the CITime and CITimeEach flags
2274 //
2275 if (!success) {
2276 _total_bailout_count++;
2277 if (UsePerfData) {
2278 _perf_last_failed_method->set_value(counters->current_method());
2279 _perf_last_failed_type->set_value(counters->compile_type());
2280 _perf_total_bailout_count->inc();
2281 }
2282 } else if (code == NULL) {
2283 if (UsePerfData) {
2284 _perf_last_invalidated_method->set_value(counters->current_method());
2285 _perf_last_invalidated_type->set_value(counters->compile_type());
2286 _perf_total_invalidated_count->inc();
2287 }
2288 _total_invalidated_count++;
2289 } else {
2290 // Compilation succeeded
2292 // update compilation ticks - used by the implementation of
2293 // java.lang.management.CompilationMBean
2294 _perf_total_compilation->inc(time.ticks());
2296 _t_total_compilation.add(time);
2297 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2299 if (CITime) {
2300 if (is_osr) {
2301 _t_osr_compilation.add(time);
2302 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2303 } else {
2304 _t_standard_compilation.add(time);
2305 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2306 }
2307 }
2309 if (UsePerfData) {
2310 // save the name of the last method compiled
2311 _perf_last_method->set_value(counters->current_method());
2312 _perf_last_compile_type->set_value(counters->compile_type());
2313 _perf_last_compile_size->set_value(method->code_size() +
2314 task->num_inlined_bytecodes());
2315 if (is_osr) {
2316 _perf_osr_compilation->inc(time.ticks());
2317 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2318 } else {
2319 _perf_standard_compilation->inc(time.ticks());
2320 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2321 }
2322 }
2324 if (CITimeEach) {
2325 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2326 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2327 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2328 }
2330 // Collect counts of successful compilations
2331 _sum_nmethod_size += code->total_size();
2332 _sum_nmethod_code_size += code->insts_size();
2333 _total_compile_count++;
2335 if (UsePerfData) {
2336 _perf_sum_nmethod_size->inc( code->total_size());
2337 _perf_sum_nmethod_code_size->inc(code->insts_size());
2338 _perf_total_compile_count->inc();
2339 }
2341 if (is_osr) {
2342 if (UsePerfData) _perf_total_osr_compile_count->inc();
2343 _total_osr_compile_count++;
2344 } else {
2345 if (UsePerfData) _perf_total_standard_compile_count->inc();
2346 _total_standard_compile_count++;
2347 }
2348 }
2349 // set the current method for the thread to null
2350 if (UsePerfData) counters->set_current_method("");
2351 }
2353 const char* CompileBroker::compiler_name(int comp_level) {
2354 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2355 if (comp == NULL) {
2356 return "no compiler";
2357 } else {
2358 return (comp->name());
2359 }
2360 }
2362 void CompileBroker::print_times() {
2363 tty->cr();
2364 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2365 tty->print_cr("------------------------------------------------");
2366 //0000000000111111111122222222223333333333444444444455555555556666666666
2367 //0123456789012345678901234567890123456789012345678901234567890123456789
2368 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2369 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2370 CompileBroker::_t_standard_compilation.seconds(),
2371 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2372 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);
2374 AbstractCompiler *comp = compiler(CompLevel_simple);
2375 if (comp != NULL) {
2376 comp->print_timers();
2377 }
2378 comp = compiler(CompLevel_full_optimization);
2379 if (comp != NULL) {
2380 comp->print_timers();
2381 }
2382 tty->cr();
2383 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2384 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2385 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2386 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2387 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2388 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2389 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2390 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2391 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2392 tty->cr();
2393 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2394 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2395 }
2397 // Debugging output for failure
2398 void CompileBroker::print_last_compile() {
2399 if ( _last_compile_level != CompLevel_none &&
2400 compiler(_last_compile_level) != NULL &&
2401 _last_method_compiled != NULL &&
2402 _last_compile_type != no_compile) {
2403 if (_last_compile_type == osr_compile) {
2404 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2405 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2406 } else {
2407 tty->print_cr("Last parse: %d+++(%d) %s",
2408 _compilation_id, _last_compile_level, _last_method_compiled);
2409 }
2410 }
2411 }
2414 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2415 #ifndef PRODUCT
2416 st->print_cr("Compiler thread printing unimplemented.");
2417 st->cr();
2418 #endif
2419 }