1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodData.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "prims/whitebox.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/atomic.inline.hpp"
41 #include "runtime/compilationPolicy.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/interfaceSupport.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/os.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/sweeper.hpp"
48 #include "trace/tracing.hpp"
49 #include "utilities/dtrace.hpp"
50 #include "utilities/events.hpp"
51 #ifdef COMPILER1
52 #include "c1/c1_Compiler.hpp"
53 #endif
54 #ifdef COMPILER2
55 #include "opto/c2compiler.hpp"
56 #endif
57 #ifdef SHARK
58 #include "shark/sharkCompiler.hpp"
59 #endif
60
61 #ifdef DTRACE_ENABLED
62
63 // Only bother with this argument setup if dtrace is available
64
65 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
66 { \
67 Symbol* klass_name = (method)->klass_name(); \
68 Symbol* name = (method)->name(); \
69 Symbol* signature = (method)->signature(); \
70 HOTSPOT_METHOD_COMPILE_BEGIN( \
71 (char *) comp_name, strlen(comp_name), \
72 (char *) klass_name->bytes(), klass_name->utf8_length(), \
73 (char *) name->bytes(), name->utf8_length(), \
74 (char *) signature->bytes(), signature->utf8_length()); \
75 }
76
77 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
78 { \
79 Symbol* klass_name = (method)->klass_name(); \
80 Symbol* name = (method)->name(); \
81 Symbol* signature = (method)->signature(); \
82 HOTSPOT_METHOD_COMPILE_END( \
83 (char *) comp_name, strlen(comp_name), \
84 (char *) klass_name->bytes(), klass_name->utf8_length(), \
85 (char *) name->bytes(), name->utf8_length(), \
86 (char *) signature->bytes(), signature->utf8_length(), (success)); \
87 }
88
89 #else // ndef DTRACE_ENABLED
90
91 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
92 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
93
94 #endif // ndef DTRACE_ENABLED
95
96 bool CompileBroker::_initialized = false;
97 volatile bool CompileBroker::_should_block = false;
98 volatile jint CompileBroker::_print_compilation_warning = 0;
99 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
100
101 // The installed compiler(s)
102 AbstractCompiler* CompileBroker::_compilers[2];
103
104 // These counters are used to assign an unique ID to each compilation.
105 volatile jint CompileBroker::_compilation_id = 0;
106 volatile jint CompileBroker::_osr_compilation_id = 0;
107
108 // Debugging information
109 int CompileBroker::_last_compile_type = no_compile;
110 int CompileBroker::_last_compile_level = CompLevel_none;
111 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
112
113 // Performance counters
114 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
115 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
116 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
117
118 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
119 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
121 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
122 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
123
124 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
125 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
126 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
127 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
128
129 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
130 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
131 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
132 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
133 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
134 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
135 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
136
137 // Timers and counters for generating statistics
138 elapsedTimer CompileBroker::_t_total_compilation;
139 elapsedTimer CompileBroker::_t_osr_compilation;
140 elapsedTimer CompileBroker::_t_standard_compilation;
141 elapsedTimer CompileBroker::_t_invalidated_compilation;
142 elapsedTimer CompileBroker::_t_bailedout_compilation;
143
144 int CompileBroker::_total_bailout_count = 0;
145 int CompileBroker::_total_invalidated_count = 0;
146 int CompileBroker::_total_compile_count = 0;
147 int CompileBroker::_total_osr_compile_count = 0;
148 int CompileBroker::_total_standard_compile_count = 0;
149
150 int CompileBroker::_sum_osr_bytes_compiled = 0;
151 int CompileBroker::_sum_standard_bytes_compiled = 0;
152 int CompileBroker::_sum_nmethod_size = 0;
153 int CompileBroker::_sum_nmethod_code_size = 0;
154
155 long CompileBroker::_peak_compilation_time = 0;
156
157 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
158 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
159
160
161 class CompilationLog : public StringEventLog {
162 public:
163 CompilationLog() : StringEventLog("Compilation events") {
164 }
165
166 void log_compile(JavaThread* thread, CompileTask* task) {
167 StringLogMessage lm;
168 stringStream sstr = lm.stream();
169 // msg.time_stamp().update_to(tty->time_stamp().ticks());
170 task->print_compilation(&sstr, NULL, true, false);
171 log(thread, "%s", (const char*)lm);
172 }
173
174 void log_nmethod(JavaThread* thread, nmethod* nm) {
175 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
176 nm->compile_id(), nm->is_osr_method() ? "%" : "",
177 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
178 }
179
180 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
181 StringLogMessage lm;
182 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
183 if (retry_message != NULL) {
184 lm.append(" (%s)", retry_message);
185 }
186 lm.print("\n");
187 log(thread, "%s", (const char*)lm);
188 }
189
190 void log_metaspace_failure(const char* reason) {
191 ResourceMark rm;
192 StringLogMessage lm;
193 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
194 lm.print("\n");
195 log(JavaThread::current(), "%s", (const char*)lm);
196 }
197 };
198
199 static CompilationLog* _compilation_log = NULL;
200
201 void compileBroker_init() {
202 if (LogEvents) {
203 _compilation_log = new CompilationLog();
204 }
205 }
206
207 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
208 CompilerThread* thread = CompilerThread::current();
209 thread->set_task(task);
210 CompileLog* log = thread->log();
211 if (log != NULL) task->log_task_start(log);
212 }
213
214 CompileTaskWrapper::~CompileTaskWrapper() {
215 CompilerThread* thread = CompilerThread::current();
216 CompileTask* task = thread->task();
217 CompileLog* log = thread->log();
218 if (log != NULL) task->log_task_done(log);
219 thread->set_task(NULL);
220 task->set_code_handle(NULL);
221 thread->set_env(NULL);
222 if (task->is_blocking()) {
223 MutexLocker notifier(task->lock(), thread);
224 task->mark_complete();
225 // Notify the waiting thread that the compilation has completed.
226 task->lock()->notify_all();
227 } else {
228 task->mark_complete();
229
230 // By convention, the compiling thread is responsible for
231 // recycling a non-blocking CompileTask.
232 CompileTask::free(task);
233 }
234 }
235
236
237 CompileTask* CompileTask::_task_free_list = NULL;
238 #ifdef ASSERT
239 int CompileTask::_num_allocated_tasks = 0;
240 #endif
241 /**
242 * Allocate a CompileTask, from the free list if possible.
243 */
244 CompileTask* CompileTask::allocate() {
245 MutexLocker locker(CompileTaskAlloc_lock);
246 CompileTask* task = NULL;
247
248 if (_task_free_list != NULL) {
249 task = _task_free_list;
250 _task_free_list = task->next();
251 task->set_next(NULL);
252 } else {
253 task = new CompileTask();
254 DEBUG_ONLY(_num_allocated_tasks++;)
255 assert (WhiteBoxAPI || _num_allocated_tasks < 10000, "Leaking compilation tasks?");
256 task->set_next(NULL);
257 task->set_is_free(true);
258 }
259 assert(task->is_free(), "Task must be free.");
260 task->set_is_free(false);
261 return task;
262 }
263
264
265 /**
266 * Add a task to the free list.
267 */
268 void CompileTask::free(CompileTask* task) {
269 MutexLocker locker(CompileTaskAlloc_lock);
270 if (!task->is_free()) {
271 task->set_code(NULL);
272 assert(!task->lock()->is_locked(), "Should not be locked when freed");
273 JNIHandles::destroy_global(task->_method_holder);
274 JNIHandles::destroy_global(task->_hot_method_holder);
275
276 task->set_is_free(true);
277 task->set_next(_task_free_list);
278 _task_free_list = task;
279 }
280 }
281
282 void CompileTask::initialize(int compile_id,
283 methodHandle method,
284 int osr_bci,
285 int comp_level,
286 methodHandle hot_method,
287 int hot_count,
288 const char* comment,
289 bool is_blocking) {
290 assert(!_lock->is_locked(), "bad locking");
291
292 _compile_id = compile_id;
293 _method = method();
294 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
295 _osr_bci = osr_bci;
296 _is_blocking = is_blocking;
297 _comp_level = comp_level;
298 _num_inlined_bytecodes = 0;
299
300 _is_complete = false;
301 _is_success = false;
302 _code_handle = NULL;
303
304 _hot_method = NULL;
305 _hot_method_holder = NULL;
306 _hot_count = hot_count;
307 _time_queued = 0; // tidy
308 _comment = comment;
309 _failure_reason = NULL;
310
311 if (LogCompilation) {
312 _time_queued = os::elapsed_counter();
313 if (hot_method.not_null()) {
314 if (hot_method == method) {
315 _hot_method = _method;
316 } else {
317 _hot_method = hot_method();
318 // only add loader or mirror if different from _method_holder
319 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
320 }
321 }
322 }
323
324 _next = NULL;
325 }
326
327 // ------------------------------------------------------------------
328 // CompileTask::code/set_code
329 nmethod* CompileTask::code() const {
330 if (_code_handle == NULL) return NULL;
331 return _code_handle->code();
332 }
333 void CompileTask::set_code(nmethod* nm) {
334 if (_code_handle == NULL && nm == NULL) return;
335 guarantee(_code_handle != NULL, "");
336 _code_handle->set_code(nm);
337 if (nm == NULL) _code_handle = NULL; // drop the handle also
338 }
339
340 void CompileTask::mark_on_stack() {
341 // Mark these methods as something redefine classes cannot remove.
342 _method->set_on_stack(true);
343 if (_hot_method != NULL) {
344 _hot_method->set_on_stack(true);
345 }
346 }
347
348 // RedefineClasses support
349 void CompileTask::metadata_do(void f(Metadata*)) {
350 f(method());
351 if (hot_method() != NULL && hot_method() != method()) {
352 f(hot_method());
353 }
354 }
355
356 // ------------------------------------------------------------------
357 // CompileTask::print_line_on_error
358 //
359 // This function is called by fatal error handler when the thread
360 // causing troubles is a compiler thread.
361 //
362 // Do not grab any lock, do not allocate memory.
363 //
364 // Otherwise it's the same as CompileTask::print_line()
365 //
366 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
367 // print compiler name
368 st->print("%s:", CompileBroker::compiler_name(comp_level()));
369 print_compilation(st);
370 }
371
372 // ------------------------------------------------------------------
373 // CompileTask::print_line
374 void CompileTask::print_tty() {
375 ttyLocker ttyl; // keep the following output all in one block
376 // print compiler name if requested
377 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
378 print_compilation(tty);
379 }
380
381 // ------------------------------------------------------------------
382 // CompileTask::print_compilation_impl
383 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
384 bool is_osr_method, int osr_bci, bool is_blocking,
385 const char* msg, bool short_form, bool cr) {
386 if (!short_form) {
387 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
388 }
389 st->print("%4d ", compile_id); // print compilation number
390
391 // For unloaded methods the transition to zombie occurs after the
392 // method is cleared so it's impossible to report accurate
393 // information for that case.
394 bool is_synchronized = false;
395 bool has_exception_handler = false;
396 bool is_native = false;
397 if (method != NULL) {
398 is_synchronized = method->is_synchronized();
399 has_exception_handler = method->has_exception_handler();
400 is_native = method->is_native();
401 }
402 // method attributes
403 const char compile_type = is_osr_method ? '%' : ' ';
404 const char sync_char = is_synchronized ? 's' : ' ';
405 const char exception_char = has_exception_handler ? '!' : ' ';
406 const char blocking_char = is_blocking ? 'b' : ' ';
407 const char native_char = is_native ? 'n' : ' ';
408
409 // print method attributes
410 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
411
412 if (TieredCompilation) {
413 if (comp_level != -1) st->print("%d ", comp_level);
414 else st->print("- ");
415 }
416 st->print(" "); // more indent
417
418 if (method == NULL) {
419 st->print("(method)");
420 } else {
421 method->print_short_name(st);
422 if (is_osr_method) {
423 st->print(" @ %d", osr_bci);
424 }
425 if (method->is_native())
426 st->print(" (native)");
427 else
428 st->print(" (%d bytes)", method->code_size());
429 }
430
431 if (msg != NULL) {
432 st->print(" %s", msg);
433 }
434 if (cr) {
435 st->cr();
436 }
437 }
438
439 // ------------------------------------------------------------------
440 // CompileTask::print_inlining
441 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
442 // 1234567
443 st->print(" "); // print timestamp
444 // 1234
445 st->print(" "); // print compilation number
446
447 // method attributes
448 if (method->is_loaded()) {
449 const char sync_char = method->is_synchronized() ? 's' : ' ';
450 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
451 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
452
453 // print method attributes
454 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
455 } else {
456 // %s!bn
457 st->print(" "); // print method attributes
458 }
459
460 if (TieredCompilation) {
461 st->print(" ");
462 }
463 st->print(" "); // more indent
464 st->print(" "); // initial inlining indent
465
466 for (int i = 0; i < inline_level; i++) st->print(" ");
467
468 st->print("@ %d ", bci); // print bci
469 method->print_short_name(st);
470 if (method->is_loaded())
471 st->print(" (%d bytes)", method->code_size());
472 else
473 st->print(" (not loaded)");
474
475 if (msg != NULL) {
476 st->print(" %s", msg);
477 }
478 st->cr();
479 }
480
481 // ------------------------------------------------------------------
482 // CompileTask::print_inline_indent
483 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
484 // 1234567
485 st->print(" "); // print timestamp
486 // 1234
487 st->print(" "); // print compilation number
488 // %s!bn
489 st->print(" "); // print method attributes
490 if (TieredCompilation) {
491 st->print(" ");
492 }
493 st->print(" "); // more indent
494 st->print(" "); // initial inlining indent
495 for (int i = 0; i < inline_level; i++) st->print(" ");
496 }
497
498 // ------------------------------------------------------------------
499 // CompileTask::print_compilation
500 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
501 bool is_osr_method = osr_bci() != InvocationEntryBci;
502 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
503 }
504
505 // ------------------------------------------------------------------
506 // CompileTask::log_task
507 void CompileTask::log_task(xmlStream* log) {
508 Thread* thread = Thread::current();
509 methodHandle method(thread, this->method());
510 ResourceMark rm(thread);
511
512 // <task compiler='Cx' id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
513 log->print(" compiler='%s' compile_id='%d'", _comp_level <= CompLevel_full_profile ? "C1" : "C2", _compile_id);
514 if (_osr_bci != CompileBroker::standard_entry_bci) {
515 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
516 } // else compile_kind='c2c'
517 if (!method.is_null()) log->method(method);
518 if (_osr_bci != CompileBroker::standard_entry_bci) {
519 log->print(" osr_bci='%d'", _osr_bci);
520 }
521 if (_comp_level != CompLevel_highest_tier) {
522 log->print(" level='%d'", _comp_level);
523 }
524 if (_is_blocking) {
525 log->print(" blocking='1'");
526 }
527 log->stamp();
528 }
529
530
531 // ------------------------------------------------------------------
532 // CompileTask::log_task_queued
533 void CompileTask::log_task_queued() {
534 Thread* thread = Thread::current();
535 ttyLocker ttyl;
536 ResourceMark rm(thread);
537
538 xtty->begin_elem("task_queued");
539 log_task(xtty);
540 if (_comment != NULL) {
541 xtty->print(" comment='%s'", _comment);
542 }
543 if (_hot_method != NULL) {
544 methodHandle hot(thread, _hot_method);
545 methodHandle method(thread, _method);
546 if (hot() != method()) {
547 xtty->method(hot);
548 }
549 }
550 if (_hot_count != 0) {
551 xtty->print(" hot_count='%d'", _hot_count);
552 }
553 xtty->end_elem();
554 }
555
556
557 // ------------------------------------------------------------------
558 // CompileTask::log_task_start
559 void CompileTask::log_task_start(CompileLog* log) {
560 log->begin_head("task");
561 log_task(log);
562 log->end_head();
563 }
564
565
566 // ------------------------------------------------------------------
567 // CompileTask::log_task_done
568 void CompileTask::log_task_done(CompileLog* log) {
569 Thread* thread = Thread::current();
570 methodHandle method(thread, this->method());
571 ResourceMark rm(thread);
572
573 if (!_is_success) {
574 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
575 log->elem("failure reason='%s'", reason);
576 }
577
578 // <task_done ... stamp='1.234'> </task>
579 nmethod* nm = code();
580 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
581 _is_success, nm == NULL ? 0 : nm->content_size(),
582 method->invocation_count());
583 int bec = method->backedge_count();
584 if (bec != 0) log->print(" backedge_count='%d'", bec);
585 // Note: "_is_complete" is about to be set, but is not.
586 if (_num_inlined_bytecodes != 0) {
587 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
588 }
589 log->stamp();
590 log->end_elem();
591 log->tail("task");
592 log->clear_identities(); // next task will have different CI
593 if (log->unflushed_count() > 2000) {
594 log->flush();
595 }
596 log->mark_file_end();
597 }
598
599
600
601 /**
602 * Add a CompileTask to a CompileQueue.
603 */
604 void CompileQueue::add(CompileTask* task) {
605 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
606
607 task->set_next(NULL);
608 task->set_prev(NULL);
609
610 if (_last == NULL) {
611 // The compile queue is empty.
612 assert(_first == NULL, "queue is empty");
613 _first = task;
614 _last = task;
615 } else {
616 // Append the task to the queue.
617 assert(_last->next() == NULL, "not last");
618 _last->set_next(task);
619 task->set_prev(_last);
620 _last = task;
621 }
622 ++_size;
623
624 // Mark the method as being in the compile queue.
625 task->method()->set_queued_for_compilation();
626
627 if (CIPrintCompileQueue) {
628 print_tty();
629 }
630
631 if (LogCompilation && xtty != NULL) {
632 task->log_task_queued();
633 }
634
635 // Notify CompilerThreads that a task is available.
636 MethodCompileQueue_lock->notify_all();
637 }
638
639 /**
640 * Empties compilation queue by putting all compilation tasks onto
641 * a freelist. Furthermore, the method wakes up all threads that are
642 * waiting on a compilation task to finish. This can happen if background
643 * compilation is disabled.
644 */
645 void CompileQueue::free_all() {
646 MutexLocker mu(MethodCompileQueue_lock);
647 CompileTask* next = _first;
648
649 // Iterate over all tasks in the compile queue
650 while (next != NULL) {
651 CompileTask* current = next;
652 next = current->next();
653 {
654 // Wake up thread that blocks on the compile task.
655 MutexLocker ct_lock(current->lock());
656 current->lock()->notify();
657 }
658 // Put the task back on the freelist.
659 CompileTask::free(current);
660 }
661 _first = NULL;
662
663 // Wake up all threads that block on the queue.
664 MethodCompileQueue_lock->notify_all();
665 }
666
667 /**
668 * Get the next CompileTask from a CompileQueue
669 */
670 CompileTask* CompileQueue::get() {
671 methodHandle save_method;
672 methodHandle save_hot_method; // save methods from RedefineClasses across safepoint
673
674 MutexLocker locker(MethodCompileQueue_lock);
675 // If _first is NULL we have no more compile jobs. There are two reasons for
676 // having no compile jobs: First, we compiled everything we wanted. Second,
677 // we ran out of code cache so compilation has been disabled. In the latter
678 // case we perform code cache sweeps to free memory such that we can re-enable
679 // compilation.
680 while (_first == NULL) {
681 // Exit loop if compilation is disabled forever
682 if (CompileBroker::is_compilation_disabled_forever()) {
683 return NULL;
684 }
685
686 // If there are no compilation tasks and we can compile new jobs
687 // (i.e., there is enough free space in the code cache) there is
688 // no need to invoke the sweeper. As a result, the hotness of methods
689 // remains unchanged. This behavior is desired, since we want to keep
690 // the stable state, i.e., we do not want to evict methods from the
691 // code cache if it is unnecessary.
692 // We need a timed wait here, since compiler threads can exit if compilation
693 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
694 // is not critical and we do not want idle compiler threads to wake up too often.
695 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
696 }
697
698 if (CompileBroker::is_compilation_disabled_forever()) {
699 return NULL;
700 }
701
702 CompileTask* task;
703 {
704 No_Safepoint_Verifier nsv;
705 task = CompilationPolicy::policy()->select_task(this);
706 }
707
708 // Save method pointer across unlock safepoint. The task is removed from
709 // the compilation queue, which is walked during RedefineClasses.
710 save_method = methodHandle(task->method());
711 save_hot_method = methodHandle(task->hot_method());
712
713 remove(task);
714 purge_stale_tasks(); // may temporarily release MCQ lock
715 return task;
716 }
717
718 // Clean & deallocate stale compile tasks.
719 // Temporarily releases MethodCompileQueue lock.
720 void CompileQueue::purge_stale_tasks() {
721 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
722 if (_first_stale != NULL) {
723 // Stale tasks are purged when MCQ lock is released,
724 // but _first_stale updates are protected by MCQ lock.
725 // Once task processing starts and MCQ lock is released,
726 // other compiler threads can reuse _first_stale.
727 CompileTask* head = _first_stale;
728 _first_stale = NULL;
729 {
730 MutexUnlocker ul(MethodCompileQueue_lock);
731 for (CompileTask* task = head; task != NULL; ) {
732 CompileTask* next_task = task->next();
733 CompileTaskWrapper ctw(task); // Frees the task
734 task->set_failure_reason("stale task");
735 task = next_task;
736 }
737 }
738 }
739 }
740
741 void CompileQueue::remove(CompileTask* task) {
742 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
743 if (task->prev() != NULL) {
744 task->prev()->set_next(task->next());
745 } else {
746 // max is the first element
747 assert(task == _first, "Sanity");
748 _first = task->next();
749 }
750
751 if (task->next() != NULL) {
752 task->next()->set_prev(task->prev());
753 } else {
754 // max is the last element
755 assert(task == _last, "Sanity");
756 _last = task->prev();
757 }
758 --_size;
759 }
760
761 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
762 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
763 remove(task);
764
765 // Enqueue the task for reclamation (should be done outside MCQ lock)
766 task->set_next(_first_stale);
767 task->set_prev(NULL);
768 _first_stale = task;
769 }
770
771 // methods in the compile queue need to be marked as used on the stack
772 // so that they don't get reclaimed by Redefine Classes
773 void CompileQueue::mark_on_stack() {
774 CompileTask* task = _first;
775 while (task != NULL) {
776 task->mark_on_stack();
777 task = task->next();
778 }
779 }
780
781
782 CompileQueue* CompileBroker::compile_queue(int comp_level) {
783 if (is_c2_compile(comp_level)) return _c2_compile_queue;
784 if (is_c1_compile(comp_level)) return _c1_compile_queue;
785 return NULL;
786 }
787
788
789 void CompileBroker::print_compile_queues(outputStream* st) {
790 MutexLocker locker(MethodCompileQueue_lock);
791 if (_c1_compile_queue != NULL) {
792 _c1_compile_queue->print(st);
793 }
794 if (_c2_compile_queue != NULL) {
795 _c2_compile_queue->print(st);
796 }
797 }
798
799 void CompileQueue::print(outputStream* st) {
800 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
801 st->print_cr("Contents of %s", name());
802 st->print_cr("----------------------------");
803 CompileTask* task = _first;
804 if (task == NULL) {
805 st->print_cr("Empty");
806 } else {
807 while (task != NULL) {
808 task->print_compilation(st, NULL, true, true);
809 task = task->next();
810 }
811 }
812 st->print_cr("----------------------------");
813 }
814
815 void CompileQueue::print_tty() {
816 ttyLocker ttyl;
817 print(tty);
818 }
819
820 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
821
822 _current_method[0] = '\0';
823 _compile_type = CompileBroker::no_compile;
824
825 if (UsePerfData) {
826 ResourceMark rm;
827
828 // create the thread instance name space string - don't create an
829 // instance subspace if instance is -1 - keeps the adapterThread
830 // counters from having a ".0" namespace.
831 const char* thread_i = (instance == -1) ? thread_name :
832 PerfDataManager::name_space(thread_name, instance);
833
834
835 char* name = PerfDataManager::counter_name(thread_i, "method");
836 _perf_current_method =
837 PerfDataManager::create_string_variable(SUN_CI, name,
838 cmname_buffer_length,
839 _current_method, CHECK);
840
841 name = PerfDataManager::counter_name(thread_i, "type");
842 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
843 PerfData::U_None,
844 (jlong)_compile_type,
845 CHECK);
846
847 name = PerfDataManager::counter_name(thread_i, "time");
848 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
849 PerfData::U_Ticks, CHECK);
850
851 name = PerfDataManager::counter_name(thread_i, "compiles");
852 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
853 PerfData::U_Events, CHECK);
854 }
855 }
856
857 // ------------------------------------------------------------------
858 // CompileBroker::compilation_init
859 //
860 // Initialize the Compilation object
861 void CompileBroker::compilation_init() {
862 _last_method_compiled[0] = '\0';
863
864 // No need to initialize compilation system if we do not use it.
865 if (!UseCompiler) {
866 return;
867 }
868 #ifndef SHARK
869 // Set the interface to the current compiler(s).
870 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
871 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
872 #ifdef COMPILER1
873 if (c1_count > 0) {
874 _compilers[0] = new Compiler();
875 }
876 #endif // COMPILER1
877
878 #ifdef COMPILER2
879 if (c2_count > 0) {
880 _compilers[1] = new C2Compiler();
881 }
882 #endif // COMPILER2
883
884 #else // SHARK
885 int c1_count = 0;
886 int c2_count = 1;
887
888 _compilers[1] = new SharkCompiler();
889 #endif // SHARK
890
891 // Start the compiler thread(s) and the sweeper thread
892 init_compiler_sweeper_threads(c1_count, c2_count);
893 // totalTime performance counter is always created as it is required
894 // by the implementation of java.lang.management.CompilationMBean.
895 {
896 EXCEPTION_MARK;
897 _perf_total_compilation =
898 PerfDataManager::create_counter(JAVA_CI, "totalTime",
899 PerfData::U_Ticks, CHECK);
900 }
901
902
903 if (UsePerfData) {
904
905 EXCEPTION_MARK;
906
907 // create the jvmstat performance counters
908 _perf_osr_compilation =
909 PerfDataManager::create_counter(SUN_CI, "osrTime",
910 PerfData::U_Ticks, CHECK);
911
912 _perf_standard_compilation =
913 PerfDataManager::create_counter(SUN_CI, "standardTime",
914 PerfData::U_Ticks, CHECK);
915
916 _perf_total_bailout_count =
917 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
918 PerfData::U_Events, CHECK);
919
920 _perf_total_invalidated_count =
921 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
922 PerfData::U_Events, CHECK);
923
924 _perf_total_compile_count =
925 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
926 PerfData::U_Events, CHECK);
927 _perf_total_osr_compile_count =
928 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
929 PerfData::U_Events, CHECK);
930
931 _perf_total_standard_compile_count =
932 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
933 PerfData::U_Events, CHECK);
934
935 _perf_sum_osr_bytes_compiled =
936 PerfDataManager::create_counter(SUN_CI, "osrBytes",
937 PerfData::U_Bytes, CHECK);
938
939 _perf_sum_standard_bytes_compiled =
940 PerfDataManager::create_counter(SUN_CI, "standardBytes",
941 PerfData::U_Bytes, CHECK);
942
943 _perf_sum_nmethod_size =
944 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
945 PerfData::U_Bytes, CHECK);
946
947 _perf_sum_nmethod_code_size =
948 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
949 PerfData::U_Bytes, CHECK);
950
951 _perf_last_method =
952 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
953 CompilerCounters::cmname_buffer_length,
954 "", CHECK);
955
956 _perf_last_failed_method =
957 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
958 CompilerCounters::cmname_buffer_length,
959 "", CHECK);
960
961 _perf_last_invalidated_method =
962 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
963 CompilerCounters::cmname_buffer_length,
964 "", CHECK);
965
966 _perf_last_compile_type =
967 PerfDataManager::create_variable(SUN_CI, "lastType",
968 PerfData::U_None,
969 (jlong)CompileBroker::no_compile,
970 CHECK);
971
972 _perf_last_compile_size =
973 PerfDataManager::create_variable(SUN_CI, "lastSize",
974 PerfData::U_Bytes,
975 (jlong)CompileBroker::no_compile,
976 CHECK);
977
978
979 _perf_last_failed_type =
980 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
981 PerfData::U_None,
982 (jlong)CompileBroker::no_compile,
983 CHECK);
984
985 _perf_last_invalidated_type =
986 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
987 PerfData::U_None,
988 (jlong)CompileBroker::no_compile,
989 CHECK);
990 }
991
992 _initialized = true;
993 }
994
995
996 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
997 AbstractCompiler* comp, bool compiler_thread, TRAPS) {
998 JavaThread* thread = NULL;
999 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
1000 instanceKlassHandle klass (THREAD, k);
1001 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1002 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1003
1004 // Initialize thread_oop to put it into the system threadGroup
1005 Handle thread_group (THREAD, Universe::system_thread_group());
1006 JavaValue result(T_VOID);
1007 JavaCalls::call_special(&result, thread_oop,
1008 klass,
1009 vmSymbols::object_initializer_name(),
1010 vmSymbols::threadgroup_string_void_signature(),
1011 thread_group,
1012 string,
1013 CHECK_0);
1014
1015 {
1016 MutexLocker mu(Threads_lock, THREAD);
1017 if (compiler_thread) {
1018 thread = new CompilerThread(queue, counters);
1019 } else {
1020 thread = new CodeCacheSweeperThread();
1021 }
1022 // At this point the new CompilerThread data-races with this startup
1023 // thread (which I believe is the primoridal thread and NOT the VM
1024 // thread). This means Java bytecodes being executed at startup can
1025 // queue compile jobs which will run at whatever default priority the
1026 // newly created CompilerThread runs at.
1027
1028
1029 // At this point it may be possible that no osthread was created for the
1030 // JavaThread due to lack of memory. We would have to throw an exception
1031 // in that case. However, since this must work and we do not allow
1032 // exceptions anyway, check and abort if this fails.
1033
1034 if (thread == NULL || thread->osthread() == NULL) {
1035 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1036 os::native_thread_creation_failed_msg());
1037 }
1038
1039 java_lang_Thread::set_thread(thread_oop(), thread);
1040
1041 // Note that this only sets the JavaThread _priority field, which by
1042 // definition is limited to Java priorities and not OS priorities.
1043 // The os-priority is set in the CompilerThread startup code itself
1044
1045 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1046
1047 // Note that we cannot call os::set_priority because it expects Java
1048 // priorities and we are *explicitly* using OS priorities so that it's
1049 // possible to set the compiler thread priority higher than any Java
1050 // thread.
1051
1052 int native_prio = CompilerThreadPriority;
1053 if (native_prio == -1) {
1054 if (UseCriticalCompilerThreadPriority) {
1055 native_prio = os::java_to_os_priority[CriticalPriority];
1056 } else {
1057 native_prio = os::java_to_os_priority[NearMaxPriority];
1058 }
1059 }
1060 os::set_native_priority(thread, native_prio);
1061
1062 java_lang_Thread::set_daemon(thread_oop());
1063
1064 thread->set_threadObj(thread_oop());
1065 if (compiler_thread) {
1066 thread->as_CompilerThread()->set_compiler(comp);
1067 }
1068 Threads::add(thread);
1069 Thread::start(thread);
1070 }
1071
1072 // Let go of Threads_lock before yielding
1073 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1074
1075 return thread;
1076 }
1077
1078
1079 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
1080 EXCEPTION_MARK;
1081 #if !defined(ZERO) && !defined(SHARK)
1082 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1083 #endif // !ZERO && !SHARK
1084 // Initialize the compilation queue
1085 if (c2_compiler_count > 0) {
1086 _c2_compile_queue = new CompileQueue("C2 compile queue");
1087 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1088 }
1089 if (c1_compiler_count > 0) {
1090 _c1_compile_queue = new CompileQueue("C1 compile queue");
1091 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1092 }
1093
1094 int compiler_count = c1_compiler_count + c2_compiler_count;
1095
1096 char name_buffer[256];
1097 const bool compiler_thread = true;
1098 for (int i = 0; i < c2_compiler_count; i++) {
1099 // Create a name for our thread.
1100 sprintf(name_buffer, "C2 CompilerThread%d", i);
1101 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1102 // Shark and C2
1103 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
1104 }
1105
1106 for (int i = c2_compiler_count; i < compiler_count; i++) {
1107 // Create a name for our thread.
1108 sprintf(name_buffer, "C1 CompilerThread%d", i);
1109 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1110 // C1
1111 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
1112 }
1113
1114 if (UsePerfData) {
1115 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1116 }
1117
1118 if (MethodFlushing) {
1119 // Initialize the sweeper thread
1120 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
1121 }
1122 }
1123
1124
1125 /**
1126 * Set the methods on the stack as on_stack so that redefine classes doesn't
1127 * reclaim them. This method is executed at a safepoint.
1128 */
1129 void CompileBroker::mark_on_stack() {
1130 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1131 // Since we are at a safepoint, we do not need a lock to access
1132 // the compile queues.
1133 if (_c2_compile_queue != NULL) {
1134 _c2_compile_queue->mark_on_stack();
1135 }
1136 if (_c1_compile_queue != NULL) {
1137 _c1_compile_queue->mark_on_stack();
1138 }
1139 }
1140
1141 // ------------------------------------------------------------------
1142 // CompileBroker::compile_method
1143 //
1144 // Request compilation of a method.
1145 void CompileBroker::compile_method_base(methodHandle method,
1146 int osr_bci,
1147 int comp_level,
1148 methodHandle hot_method,
1149 int hot_count,
1150 const char* comment,
1151 Thread* thread) {
1152 // do nothing if compiler thread(s) is not available
1153 if (!_initialized) {
1154 return;
1155 }
1156
1157 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1158 assert(method->method_holder()->oop_is_instance(),
1159 "sanity check");
1160 assert(!method->method_holder()->is_not_initialized(),
1161 "method holder must be initialized");
1162 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1163
1164 if (CIPrintRequests) {
1165 tty->print("request: ");
1166 method->print_short_name(tty);
1167 if (osr_bci != InvocationEntryBci) {
1168 tty->print(" osr_bci: %d", osr_bci);
1169 }
1170 tty->print(" comment: %s count: %d", comment, hot_count);
1171 if (!hot_method.is_null()) {
1172 tty->print(" hot: ");
1173 if (hot_method() != method()) {
1174 hot_method->print_short_name(tty);
1175 } else {
1176 tty->print("yes");
1177 }
1178 }
1179 tty->cr();
1180 }
1181
1182 // A request has been made for compilation. Before we do any
1183 // real work, check to see if the method has been compiled
1184 // in the meantime with a definitive result.
1185 if (compilation_is_complete(method, osr_bci, comp_level)) {
1186 return;
1187 }
1188
1189 #ifndef PRODUCT
1190 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1191 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1192 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1193 return;
1194 }
1195 }
1196 #endif
1197
1198 // If this method is already in the compile queue, then
1199 // we do not block the current thread.
1200 if (compilation_is_in_queue(method)) {
1201 // We may want to decay our counter a bit here to prevent
1202 // multiple denied requests for compilation. This is an
1203 // open compilation policy issue. Note: The other possibility,
1204 // in the case that this is a blocking compile request, is to have
1205 // all subsequent blocking requesters wait for completion of
1206 // ongoing compiles. Note that in this case we'll need a protocol
1207 // for freeing the associated compile tasks. [Or we could have
1208 // a single static monitor on which all these waiters sleep.]
1209 return;
1210 }
1211
1212 // If the requesting thread is holding the pending list lock
1213 // then we just return. We can't risk blocking while holding
1214 // the pending list lock or a 3-way deadlock may occur
1215 // between the reference handler thread, a GC (instigated
1216 // by a compiler thread), and compiled method registration.
1217 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1218 return;
1219 }
1220
1221 if (TieredCompilation) {
1222 // Tiered policy requires MethodCounters to exist before adding a method to
1223 // the queue. Create if we don't have them yet.
1224 method->get_method_counters(thread);
1225 }
1226
1227 // Outputs from the following MutexLocker block:
1228 CompileTask* task = NULL;
1229 bool blocking = false;
1230 CompileQueue* queue = compile_queue(comp_level);
1231
1232 // Acquire our lock.
1233 {
1234 MutexLocker locker(MethodCompileQueue_lock, thread);
1235
1236 // Make sure the method has not slipped into the queues since
1237 // last we checked; note that those checks were "fast bail-outs".
1238 // Here we need to be more careful, see 14012000 below.
1239 if (compilation_is_in_queue(method)) {
1240 return;
1241 }
1242
1243 // We need to check again to see if the compilation has
1244 // completed. A previous compilation may have registered
1245 // some result.
1246 if (compilation_is_complete(method, osr_bci, comp_level)) {
1247 return;
1248 }
1249
1250 // We now know that this compilation is not pending, complete,
1251 // or prohibited. Assign a compile_id to this compilation
1252 // and check to see if it is in our [Start..Stop) range.
1253 int compile_id = assign_compile_id(method, osr_bci);
1254 if (compile_id == 0) {
1255 // The compilation falls outside the allowed range.
1256 return;
1257 }
1258
1259 // Should this thread wait for completion of the compile?
1260 blocking = is_compile_blocking();
1261
1262 // We will enter the compilation in the queue.
1263 // 14012000: Note that this sets the queued_for_compile bits in
1264 // the target method. We can now reason that a method cannot be
1265 // queued for compilation more than once, as follows:
1266 // Before a thread queues a task for compilation, it first acquires
1267 // the compile queue lock, then checks if the method's queued bits
1268 // are set or it has already been compiled. Thus there can not be two
1269 // instances of a compilation task for the same method on the
1270 // compilation queue. Consider now the case where the compilation
1271 // thread has already removed a task for that method from the queue
1272 // and is in the midst of compiling it. In this case, the
1273 // queued_for_compile bits must be set in the method (and these
1274 // will be visible to the current thread, since the bits were set
1275 // under protection of the compile queue lock, which we hold now.
1276 // When the compilation completes, the compiler thread first sets
1277 // the compilation result and then clears the queued_for_compile
1278 // bits. Neither of these actions are protected by a barrier (or done
1279 // under the protection of a lock), so the only guarantee we have
1280 // (on machines with TSO (Total Store Order)) is that these values
1281 // will update in that order. As a result, the only combinations of
1282 // these bits that the current thread will see are, in temporal order:
1283 // <RESULT, QUEUE> :
1284 // <0, 1> : in compile queue, but not yet compiled
1285 // <1, 1> : compiled but queue bit not cleared
1286 // <1, 0> : compiled and queue bit cleared
1287 // Because we first check the queue bits then check the result bits,
1288 // we are assured that we cannot introduce a duplicate task.
1289 // Note that if we did the tests in the reverse order (i.e. check
1290 // result then check queued bit), we could get the result bit before
1291 // the compilation completed, and the queue bit after the compilation
1292 // completed, and end up introducing a "duplicate" (redundant) task.
1293 // In that case, the compiler thread should first check if a method
1294 // has already been compiled before trying to compile it.
1295 // NOTE: in the event that there are multiple compiler threads and
1296 // there is de-optimization/recompilation, things will get hairy,
1297 // and in that case it's best to protect both the testing (here) of
1298 // these bits, and their updating (here and elsewhere) under a
1299 // common lock.
1300 task = create_compile_task(queue,
1301 compile_id, method,
1302 osr_bci, comp_level,
1303 hot_method, hot_count, comment,
1304 blocking);
1305 }
1306
1307 if (blocking) {
1308 wait_for_completion(task);
1309 }
1310 }
1311
1312
1313 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1314 int comp_level,
1315 methodHandle hot_method, int hot_count,
1316 const char* comment, Thread* THREAD) {
1317 // make sure arguments make sense
1318 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1319 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1320 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1321 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1322 // allow any levels for WhiteBox
1323 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1324 // return quickly if possible
1325
1326 // lock, make sure that the compilation
1327 // isn't prohibited in a straightforward way.
1328 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1329 if (comp == NULL || !comp->can_compile_method(method) ||
1330 compilation_is_prohibited(method, osr_bci, comp_level)) {
1331 return NULL;
1332 }
1333
1334 if (osr_bci == InvocationEntryBci) {
1335 // standard compilation
1336 nmethod* method_code = method->code();
1337 if (method_code != NULL) {
1338 if (compilation_is_complete(method, osr_bci, comp_level)) {
1339 return method_code;
1340 }
1341 }
1342 if (method->is_not_compilable(comp_level)) {
1343 return NULL;
1344 }
1345 } else {
1346 // osr compilation
1347 #ifndef TIERED
1348 // seems like an assert of dubious value
1349 assert(comp_level == CompLevel_highest_tier,
1350 "all OSR compiles are assumed to be at a single compilation lavel");
1351 #endif // TIERED
1352 // We accept a higher level osr method
1353 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1354 if (nm != NULL) return nm;
1355 if (method->is_not_osr_compilable(comp_level)) return NULL;
1356 }
1357
1358 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1359 // some prerequisites that are compiler specific
1360 if (comp->is_c2() || comp->is_shark()) {
1361 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1362 // Resolve all classes seen in the signature of the method
1363 // we are compiling.
1364 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1365 }
1366
1367 // If the method is native, do the lookup in the thread requesting
1368 // the compilation. Native lookups can load code, which is not
1369 // permitted during compilation.
1370 //
1371 // Note: A native method implies non-osr compilation which is
1372 // checked with an assertion at the entry of this method.
1373 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1374 bool in_base_library;
1375 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1376 if (HAS_PENDING_EXCEPTION) {
1377 // In case of an exception looking up the method, we just forget
1378 // about it. The interpreter will kick-in and throw the exception.
1379 method->set_not_compilable(); // implies is_not_osr_compilable()
1380 CLEAR_PENDING_EXCEPTION;
1381 return NULL;
1382 }
1383 assert(method->has_native_function(), "must have native code by now");
1384 }
1385
1386 // RedefineClasses() has replaced this method; just return
1387 if (method->is_old()) {
1388 return NULL;
1389 }
1390
1391 // JVMTI -- post_compile_event requires jmethod_id() that may require
1392 // a lock the compiling thread can not acquire. Prefetch it here.
1393 if (JvmtiExport::should_post_compiled_method_load()) {
1394 method->jmethod_id();
1395 }
1396
1397 // do the compilation
1398 if (method->is_native()) {
1399 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1400 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1401 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1402 //
1403 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1404 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1405 AdapterHandlerLibrary::create_native_wrapper(method);
1406 } else {
1407 return NULL;
1408 }
1409 } else {
1410 // If the compiler is shut off due to code cache getting full
1411 // fail out now so blocking compiles dont hang the java thread
1412 if (!should_compile_new_jobs()) {
1413 CompilationPolicy::policy()->delay_compilation(method());
1414 return NULL;
1415 }
1416 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1417 }
1418
1419 // return requested nmethod
1420 // We accept a higher level osr method
1421 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1422 }
1423
1424
1425 // ------------------------------------------------------------------
1426 // CompileBroker::compilation_is_complete
1427 //
1428 // See if compilation of this method is already complete.
1429 bool CompileBroker::compilation_is_complete(methodHandle method,
1430 int osr_bci,
1431 int comp_level) {
1432 bool is_osr = (osr_bci != standard_entry_bci);
1433 if (is_osr) {
1434 if (method->is_not_osr_compilable(comp_level)) {
1435 return true;
1436 } else {
1437 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1438 return (result != NULL);
1439 }
1440 } else {
1441 if (method->is_not_compilable(comp_level)) {
1442 return true;
1443 } else {
1444 nmethod* result = method->code();
1445 if (result == NULL) return false;
1446 return comp_level == result->comp_level();
1447 }
1448 }
1449 }
1450
1451
1452 /**
1453 * See if this compilation is already requested.
1454 *
1455 * Implementation note: there is only a single "is in queue" bit
1456 * for each method. This means that the check below is overly
1457 * conservative in the sense that an osr compilation in the queue
1458 * will block a normal compilation from entering the queue (and vice
1459 * versa). This can be remedied by a full queue search to disambiguate
1460 * cases. If it is deemed profitable, this may be done.
1461 */
1462 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1463 return method->queued_for_compilation();
1464 }
1465
1466 // ------------------------------------------------------------------
1467 // CompileBroker::compilation_is_prohibited
1468 //
1469 // See if this compilation is not allowed.
1470 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1471 bool is_native = method->is_native();
1472 // Some compilers may not support the compilation of natives.
1473 AbstractCompiler *comp = compiler(comp_level);
1474 if (is_native &&
1475 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1476 method->set_not_compilable_quietly(comp_level);
1477 return true;
1478 }
1479
1480 bool is_osr = (osr_bci != standard_entry_bci);
1481 // Some compilers may not support on stack replacement.
1482 if (is_osr &&
1483 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1484 method->set_not_osr_compilable(comp_level);
1485 return true;
1486 }
1487
1488 // The method may be explicitly excluded by the user.
1489 bool quietly;
1490 double scale;
1491 if (CompilerOracle::should_exclude(method, quietly)
1492 || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1493 if (!quietly) {
1494 // This does not happen quietly...
1495 ResourceMark rm;
1496 tty->print("### Excluding %s:%s",
1497 method->is_native() ? "generation of native wrapper" : "compile",
1498 (method->is_static() ? " static" : ""));
1499 method->print_short_name(tty);
1500 tty->cr();
1501 }
1502 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1503 }
1504
1505 return false;
1506 }
1507
1508 /**
1509 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1510 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1511 * The function also allows to generate separate compilation IDs for OSR compilations.
1512 */
1513 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1514 #ifdef ASSERT
1515 bool is_osr = (osr_bci != standard_entry_bci);
1516 int id;
1517 if (method->is_native()) {
1518 assert(!is_osr, "can't be osr");
1519 // Adapters, native wrappers and method handle intrinsics
1520 // should be generated always.
1521 return Atomic::add(1, &_compilation_id);
1522 } else if (CICountOSR && is_osr) {
1523 id = Atomic::add(1, &_osr_compilation_id);
1524 if (CIStartOSR <= id && id < CIStopOSR) {
1525 return id;
1526 }
1527 } else {
1528 id = Atomic::add(1, &_compilation_id);
1529 if (CIStart <= id && id < CIStop) {
1530 return id;
1531 }
1532 }
1533
1534 // Method was not in the appropriate compilation range.
1535 method->set_not_compilable_quietly();
1536 return 0;
1537 #else
1538 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1539 // only _compilation_id is incremented.
1540 return Atomic::add(1, &_compilation_id);
1541 #endif
1542 }
1543
1544 /**
1545 * Should the current thread block until this compilation request
1546 * has been fulfilled?
1547 */
1548 bool CompileBroker::is_compile_blocking() {
1549 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1550 return !BackgroundCompilation;
1551 }
1552
1553
1554 // ------------------------------------------------------------------
1555 // CompileBroker::preload_classes
1556 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1557 // Move this code over from c1_Compiler.cpp
1558 ShouldNotReachHere();
1559 }
1560
1561
1562 // ------------------------------------------------------------------
1563 // CompileBroker::create_compile_task
1564 //
1565 // Create a CompileTask object representing the current request for
1566 // compilation. Add this task to the queue.
1567 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1568 int compile_id,
1569 methodHandle method,
1570 int osr_bci,
1571 int comp_level,
1572 methodHandle hot_method,
1573 int hot_count,
1574 const char* comment,
1575 bool blocking) {
1576 CompileTask* new_task = CompileTask::allocate();
1577 new_task->initialize(compile_id, method, osr_bci, comp_level,
1578 hot_method, hot_count, comment,
1579 blocking);
1580 queue->add(new_task);
1581 return new_task;
1582 }
1583
1584
1585 /**
1586 * Wait for the compilation task to complete.
1587 */
1588 void CompileBroker::wait_for_completion(CompileTask* task) {
1589 if (CIPrintCompileQueue) {
1590 ttyLocker ttyl;
1591 tty->print_cr("BLOCKING FOR COMPILE");
1592 }
1593
1594 assert(task->is_blocking(), "can only wait on blocking task");
1595
1596 JavaThread* thread = JavaThread::current();
1597 thread->set_blocked_on_compilation(true);
1598
1599 methodHandle method(thread, task->method());
1600 {
1601 MutexLocker waiter(task->lock(), thread);
1602
1603 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1604 task->lock()->wait();
1605 }
1606 }
1607
1608 thread->set_blocked_on_compilation(false);
1609 if (is_compilation_disabled_forever()) {
1610 CompileTask::free(task);
1611 return;
1612 }
1613
1614 // It is harmless to check this status without the lock, because
1615 // completion is a stable property (until the task object is recycled).
1616 assert(task->is_complete(), "Compilation should have completed");
1617 assert(task->code_handle() == NULL, "must be reset");
1618
1619 // By convention, the waiter is responsible for recycling a
1620 // blocking CompileTask. Since there is only one waiter ever
1621 // waiting on a CompileTask, we know that no one else will
1622 // be using this CompileTask; we can free it.
1623 CompileTask::free(task);
1624 }
1625
1626 /**
1627 * Initialize compiler thread(s) + compiler object(s). The postcondition
1628 * of this function is that the compiler runtimes are initialized and that
1629 * compiler threads can start compiling.
1630 */
1631 bool CompileBroker::init_compiler_runtime() {
1632 CompilerThread* thread = CompilerThread::current();
1633 AbstractCompiler* comp = thread->compiler();
1634 // Final sanity check - the compiler object must exist
1635 guarantee(comp != NULL, "Compiler object must exist");
1636
1637 int system_dictionary_modification_counter;
1638 {
1639 MutexLocker locker(Compile_lock, thread);
1640 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1641 }
1642
1643 {
1644 // Must switch to native to allocate ci_env
1645 ThreadToNativeFromVM ttn(thread);
1646 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1647 // Cache Jvmti state
1648 ci_env.cache_jvmti_state();
1649 // Cache DTrace flags
1650 ci_env.cache_dtrace_flags();
1651
1652 // Switch back to VM state to do compiler initialization
1653 ThreadInVMfromNative tv(thread);
1654 ResetNoHandleMark rnhm;
1655
1656
1657 if (!comp->is_shark()) {
1658 // Perform per-thread and global initializations
1659 comp->initialize();
1660 }
1661 }
1662
1663 if (comp->is_failed()) {
1664 disable_compilation_forever();
1665 // If compiler initialization failed, no compiler thread that is specific to a
1666 // particular compiler runtime will ever start to compile methods.
1667 shutdown_compiler_runtime(comp, thread);
1668 return false;
1669 }
1670
1671 // C1 specific check
1672 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1673 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1674 return false;
1675 }
1676
1677 return true;
1678 }
1679
1680 /**
1681 * If C1 and/or C2 initialization failed, we shut down all compilation.
1682 * We do this to keep things simple. This can be changed if it ever turns
1683 * out to be a problem.
1684 */
1685 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1686 // Free buffer blob, if allocated
1687 if (thread->get_buffer_blob() != NULL) {
1688 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1689 CodeCache::free(thread->get_buffer_blob());
1690 }
1691
1692 if (comp->should_perform_shutdown()) {
1693 // There are two reasons for shutting down the compiler
1694 // 1) compiler runtime initialization failed
1695 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1696 warning("%s initialization failed. Shutting down all compilers", comp->name());
1697
1698 // Only one thread per compiler runtime object enters here
1699 // Set state to shut down
1700 comp->set_shut_down();
1701
1702 // Delete all queued compilation tasks to make compiler threads exit faster.
1703 if (_c1_compile_queue != NULL) {
1704 _c1_compile_queue->free_all();
1705 }
1706
1707 if (_c2_compile_queue != NULL) {
1708 _c2_compile_queue->free_all();
1709 }
1710
1711 // Set flags so that we continue execution with using interpreter only.
1712 UseCompiler = false;
1713 UseInterpreter = true;
1714
1715 // We could delete compiler runtimes also. However, there are references to
1716 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1717 // fail. This can be done later if necessary.
1718 }
1719 }
1720
1721 // ------------------------------------------------------------------
1722 // CompileBroker::compiler_thread_loop
1723 //
1724 // The main loop run by a CompilerThread.
1725 void CompileBroker::compiler_thread_loop() {
1726 CompilerThread* thread = CompilerThread::current();
1727 CompileQueue* queue = thread->queue();
1728 // For the thread that initializes the ciObjectFactory
1729 // this resource mark holds all the shared objects
1730 ResourceMark rm;
1731
1732 // First thread to get here will initialize the compiler interface
1733
1734 if (!ciObjectFactory::is_initialized()) {
1735 ASSERT_IN_VM;
1736 MutexLocker only_one (CompileThread_lock, thread);
1737 if (!ciObjectFactory::is_initialized()) {
1738 ciObjectFactory::initialize();
1739 }
1740 }
1741
1742 // Open a log.
1743 if (LogCompilation) {
1744 init_compiler_thread_log();
1745 }
1746 CompileLog* log = thread->log();
1747 if (log != NULL) {
1748 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1749 thread->name(),
1750 os::current_thread_id(),
1751 os::current_process_id());
1752 log->stamp();
1753 log->end_elem();
1754 }
1755
1756 // If compiler thread/runtime initialization fails, exit the compiler thread
1757 if (!init_compiler_runtime()) {
1758 return;
1759 }
1760
1761 // Poll for new compilation tasks as long as the JVM runs. Compilation
1762 // should only be disabled if something went wrong while initializing the
1763 // compiler runtimes. This, in turn, should not happen. The only known case
1764 // when compiler runtime initialization fails is if there is not enough free
1765 // space in the code cache to generate the necessary stubs, etc.
1766 while (!is_compilation_disabled_forever()) {
1767 // We need this HandleMark to avoid leaking VM handles.
1768 HandleMark hm(thread);
1769
1770 CompileTask* task = queue->get();
1771 if (task == NULL) {
1772 continue;
1773 }
1774
1775 // Give compiler threads an extra quanta. They tend to be bursty and
1776 // this helps the compiler to finish up the job.
1777 if (CompilerThreadHintNoPreempt) {
1778 os::hint_no_preempt();
1779 }
1780
1781 // trace per thread time and compile statistics
1782 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1783 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1784
1785 // Assign the task to the current thread. Mark this compilation
1786 // thread as active for the profiler.
1787 CompileTaskWrapper ctw(task);
1788 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1789 task->set_code_handle(&result_handle);
1790 methodHandle method(thread, task->method());
1791
1792 // Never compile a method if breakpoints are present in it
1793 if (method()->number_of_breakpoints() == 0) {
1794 // Compile the method.
1795 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1796 invoke_compiler_on_method(task);
1797 } else {
1798 // After compilation is disabled, remove remaining methods from queue
1799 method->clear_queued_for_compilation();
1800 task->set_failure_reason("compilation is disabled");
1801 }
1802 }
1803 }
1804
1805 // Shut down compiler runtime
1806 shutdown_compiler_runtime(thread->compiler(), thread);
1807 }
1808
1809 // ------------------------------------------------------------------
1810 // CompileBroker::init_compiler_thread_log
1811 //
1812 // Set up state required by +LogCompilation.
1813 void CompileBroker::init_compiler_thread_log() {
1814 CompilerThread* thread = CompilerThread::current();
1815 char file_name[4*K];
1816 FILE* fp = NULL;
1817 intx thread_id = os::current_thread_id();
1818 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1819 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1820 if (dir == NULL) {
1821 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1822 thread_id, os::current_process_id());
1823 } else {
1824 jio_snprintf(file_name, sizeof(file_name),
1825 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1826 os::file_separator(), thread_id, os::current_process_id());
1827 }
1828
1829 fp = fopen(file_name, "wt");
1830 if (fp != NULL) {
1831 if (LogCompilation && Verbose) {
1832 tty->print_cr("Opening compilation log %s", file_name);
1833 }
1834 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1835 thread->init_log(log);
1836
1837 if (xtty != NULL) {
1838 ttyLocker ttyl;
1839 // Record any per thread log files
1840 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1841 }
1842 return;
1843 }
1844 }
1845 warning("Cannot open log file: %s", file_name);
1846 }
1847
1848 void CompileBroker::log_metaspace_failure() {
1849 const char* message = "some methods may not be compiled because metaspace "
1850 "is out of memory";
1851 if (_compilation_log != NULL) {
1852 _compilation_log->log_metaspace_failure(message);
1853 }
1854 if (PrintCompilation) {
1855 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1856 }
1857 }
1858
1859
1860 // ------------------------------------------------------------------
1861 // CompileBroker::set_should_block
1862 //
1863 // Set _should_block.
1864 // Call this from the VM, with Threads_lock held and a safepoint requested.
1865 void CompileBroker::set_should_block() {
1866 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1867 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1868 #ifndef PRODUCT
1869 if (PrintCompilation && (Verbose || WizardMode))
1870 tty->print_cr("notifying compiler thread pool to block");
1871 #endif
1872 _should_block = true;
1873 }
1874
1875 // ------------------------------------------------------------------
1876 // CompileBroker::maybe_block
1877 //
1878 // Call this from the compiler at convenient points, to poll for _should_block.
1879 void CompileBroker::maybe_block() {
1880 if (_should_block) {
1881 #ifndef PRODUCT
1882 if (PrintCompilation && (Verbose || WizardMode))
1883 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1884 #endif
1885 ThreadInVMfromNative tivfn(JavaThread::current());
1886 }
1887 }
1888
1889 // wrapper for CodeCache::print_summary()
1890 static void codecache_print(bool detailed)
1891 {
1892 ResourceMark rm;
1893 stringStream s;
1894 // Dump code cache into a buffer before locking the tty,
1895 {
1896 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1897 CodeCache::print_summary(&s, detailed);
1898 }
1899 ttyLocker ttyl;
1900 tty->print("%s", s.as_string());
1901 }
1902
1903 // ------------------------------------------------------------------
1904 // CompileBroker::invoke_compiler_on_method
1905 //
1906 // Compile a method.
1907 //
1908 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1909 if (PrintCompilation) {
1910 ResourceMark rm;
1911 task->print_tty();
1912 }
1913 elapsedTimer time;
1914
1915 CompilerThread* thread = CompilerThread::current();
1916 ResourceMark rm(thread);
1917
1918 if (LogEvents) {
1919 _compilation_log->log_compile(thread, task);
1920 }
1921
1922 // Common flags.
1923 uint compile_id = task->compile_id();
1924 int osr_bci = task->osr_bci();
1925 bool is_osr = (osr_bci != standard_entry_bci);
1926 bool should_log = (thread->log() != NULL);
1927 bool should_break = false;
1928 int task_level = task->comp_level();
1929 {
1930 // create the handle inside it's own block so it can't
1931 // accidentally be referenced once the thread transitions to
1932 // native. The NoHandleMark before the transition should catch
1933 // any cases where this occurs in the future.
1934 methodHandle method(thread, task->method());
1935 should_break = check_break_at(method, compile_id, is_osr);
1936 if (should_log && !CompilerOracle::should_log(method)) {
1937 should_log = false;
1938 }
1939 assert(!method->is_native(), "no longer compile natives");
1940
1941 // Save information about this method in case of failure.
1942 set_last_compile(thread, method, is_osr, task_level);
1943
1944 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1945 }
1946
1947 // Allocate a new set of JNI handles.
1948 push_jni_handle_block();
1949 Method* target_handle = task->method();
1950 int compilable = ciEnv::MethodCompilable;
1951 {
1952 int system_dictionary_modification_counter;
1953 {
1954 MutexLocker locker(Compile_lock, thread);
1955 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1956 }
1957
1958 NoHandleMark nhm;
1959 ThreadToNativeFromVM ttn(thread);
1960
1961 ciEnv ci_env(task, system_dictionary_modification_counter);
1962 if (should_break) {
1963 ci_env.set_break_at_compile(true);
1964 }
1965 if (should_log) {
1966 ci_env.set_log(thread->log());
1967 }
1968 assert(thread->env() == &ci_env, "set by ci_env");
1969 // The thread-env() field is cleared in ~CompileTaskWrapper.
1970
1971 // Cache Jvmti state
1972 ci_env.cache_jvmti_state();
1973
1974 // Cache DTrace flags
1975 ci_env.cache_dtrace_flags();
1976
1977 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1978
1979 TraceTime t1("compilation", &time);
1980 EventCompilation event;
1981
1982 AbstractCompiler *comp = compiler(task_level);
1983 if (comp == NULL) {
1984 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1985 } else {
1986 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1987 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1988 while (WhiteBox::compilation_locked) {
1989 locker.wait(Mutex::_no_safepoint_check_flag);
1990 }
1991 }
1992 comp->compile_method(&ci_env, target, osr_bci);
1993 }
1994
1995 if (!ci_env.failing() && task->code() == NULL) {
1996 //assert(false, "compiler should always document failure");
1997 // The compiler elected, without comment, not to register a result.
1998 // Do not attempt further compilations of this method.
1999 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2000 }
2001
2002 // Copy this bit to the enclosing block:
2003 compilable = ci_env.compilable();
2004
2005 if (ci_env.failing()) {
2006 task->set_failure_reason(ci_env.failure_reason());
2007 ci_env.report_failure(ci_env.failure_reason());
2008 const char* retry_message = ci_env.retry_message();
2009 if (_compilation_log != NULL) {
2010 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2011 }
2012 if (PrintCompilation) {
2013 FormatBufferResource msg = retry_message != NULL ?
2014 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2015 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2016 task->print_compilation(tty, msg);
2017 }
2018 } else {
2019 task->mark_success();
2020 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2021 if (_compilation_log != NULL) {
2022 nmethod* code = task->code();
2023 if (code != NULL) {
2024 _compilation_log->log_nmethod(thread, code);
2025 }
2026 }
2027 }
2028 // simulate crash during compilation
2029 assert(task->compile_id() != CICrashAt, "just as planned");
2030 if (event.should_commit()) {
2031 event.set_method(target->get_Method());
2032 event.set_compileID(compile_id);
2033 event.set_compileLevel(task->comp_level());
2034 event.set_succeded(task->is_success());
2035 event.set_isOsr(is_osr);
2036 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2037 event.set_inlinedBytes(task->num_inlined_bytecodes());
2038 event.commit();
2039 }
2040 }
2041 pop_jni_handle_block();
2042
2043 methodHandle method(thread, task->method());
2044
2045 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2046
2047 collect_statistics(thread, time, task);
2048
2049 if (PrintCompilation && PrintCompilation2) {
2050 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2051 tty->print("%4d ", compile_id); // print compilation number
2052 tty->print("%s ", (is_osr ? "%" : " "));
2053 if (task->code() != NULL) {
2054 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2055 }
2056 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2057 }
2058
2059 if (PrintCodeCacheOnCompilation)
2060 codecache_print(/* detailed= */ false);
2061
2062 // Disable compilation, if required.
2063 switch (compilable) {
2064 case ciEnv::MethodCompilable_never:
2065 if (is_osr)
2066 method->set_not_osr_compilable_quietly();
2067 else
2068 method->set_not_compilable_quietly();
2069 break;
2070 case ciEnv::MethodCompilable_not_at_tier:
2071 if (is_osr)
2072 method->set_not_osr_compilable_quietly(task_level);
2073 else
2074 method->set_not_compilable_quietly(task_level);
2075 break;
2076 }
2077
2078 // Note that the queued_for_compilation bits are cleared without
2079 // protection of a mutex. [They were set by the requester thread,
2080 // when adding the task to the compile queue -- at which time the
2081 // compile queue lock was held. Subsequently, we acquired the compile
2082 // queue lock to get this task off the compile queue; thus (to belabour
2083 // the point somewhat) our clearing of the bits must be occurring
2084 // only after the setting of the bits. See also 14012000 above.
2085 method->clear_queued_for_compilation();
2086
2087 #ifdef ASSERT
2088 if (CollectedHeap::fired_fake_oom()) {
2089 // The current compile received a fake OOM during compilation so
2090 // go ahead and exit the VM since the test apparently succeeded
2091 tty->print_cr("*** Shutting down VM after successful fake OOM");
2092 vm_exit(0);
2093 }
2094 #endif
2095 }
2096
2097 /**
2098 * The CodeCache is full. Print warning and disable compilation.
2099 * Schedule code cache cleaning so compilation can continue later.
2100 * This function needs to be called only from CodeCache::allocate(),
2101 * since we currently handle a full code cache uniformly.
2102 */
2103 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2104 UseInterpreter = true;
2105 if (UseCompiler || AlwaysCompileLoopMethods ) {
2106 if (xtty != NULL) {
2107 ResourceMark rm;
2108 stringStream s;
2109 // Dump code cache state into a buffer before locking the tty,
2110 // because log_state() will use locks causing lock conflicts.
2111 CodeCache::log_state(&s);
2112 // Lock to prevent tearing
2113 ttyLocker ttyl;
2114 xtty->begin_elem("code_cache_full");
2115 xtty->print("%s", s.as_string());
2116 xtty->stamp();
2117 xtty->end_elem();
2118 }
2119
2120 #ifndef PRODUCT
2121 if (CompileTheWorld || ExitOnFullCodeCache) {
2122 codecache_print(/* detailed= */ true);
2123 before_exit(JavaThread::current());
2124 exit_globals(); // will delete tty
2125 vm_direct_exit(CompileTheWorld ? 0 : 1);
2126 }
2127 #endif
2128 if (UseCodeCacheFlushing) {
2129 // Since code cache is full, immediately stop new compiles
2130 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2131 NMethodSweeper::log_sweep("disable_compiler");
2132 }
2133 } else {
2134 disable_compilation_forever();
2135 }
2136
2137 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2138 }
2139 }
2140
2141 // ------------------------------------------------------------------
2142 // CompileBroker::set_last_compile
2143 //
2144 // Record this compilation for debugging purposes.
2145 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2146 ResourceMark rm;
2147 char* method_name = method->name()->as_C_string();
2148 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2149 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2150 char current_method[CompilerCounters::cmname_buffer_length];
2151 size_t maxLen = CompilerCounters::cmname_buffer_length;
2152
2153 if (UsePerfData) {
2154 const char* class_name = method->method_holder()->name()->as_C_string();
2155
2156 size_t s1len = strlen(class_name);
2157 size_t s2len = strlen(method_name);
2158
2159 // check if we need to truncate the string
2160 if (s1len + s2len + 2 > maxLen) {
2161
2162 // the strategy is to lop off the leading characters of the
2163 // class name and the trailing characters of the method name.
2164
2165 if (s2len + 2 > maxLen) {
2166 // lop of the entire class name string, let snprintf handle
2167 // truncation of the method name.
2168 class_name += s1len; // null string
2169 }
2170 else {
2171 // lop off the extra characters from the front of the class name
2172 class_name += ((s1len + s2len + 2) - maxLen);
2173 }
2174 }
2175
2176 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2177 }
2178
2179 if (CICountOSR && is_osr) {
2180 _last_compile_type = osr_compile;
2181 } else {
2182 _last_compile_type = normal_compile;
2183 }
2184 _last_compile_level = comp_level;
2185
2186 if (UsePerfData) {
2187 CompilerCounters* counters = thread->counters();
2188 counters->set_current_method(current_method);
2189 counters->set_compile_type((jlong)_last_compile_type);
2190 }
2191 }
2192
2193
2194 // ------------------------------------------------------------------
2195 // CompileBroker::push_jni_handle_block
2196 //
2197 // Push on a new block of JNI handles.
2198 void CompileBroker::push_jni_handle_block() {
2199 JavaThread* thread = JavaThread::current();
2200
2201 // Allocate a new block for JNI handles.
2202 // Inlined code from jni_PushLocalFrame()
2203 JNIHandleBlock* java_handles = thread->active_handles();
2204 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2205 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2206 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2207 thread->set_active_handles(compile_handles);
2208 }
2209
2210
2211 // ------------------------------------------------------------------
2212 // CompileBroker::pop_jni_handle_block
2213 //
2214 // Pop off the current block of JNI handles.
2215 void CompileBroker::pop_jni_handle_block() {
2216 JavaThread* thread = JavaThread::current();
2217
2218 // Release our JNI handle block
2219 JNIHandleBlock* compile_handles = thread->active_handles();
2220 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2221 thread->set_active_handles(java_handles);
2222 compile_handles->set_pop_frame_link(NULL);
2223 JNIHandleBlock::release_block(compile_handles, thread); // may block
2224 }
2225
2226
2227 // ------------------------------------------------------------------
2228 // CompileBroker::check_break_at
2229 //
2230 // Should the compilation break at the current compilation.
2231 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2232 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2233 return true;
2234 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2235 return true;
2236 } else {
2237 return (compile_id == CIBreakAt);
2238 }
2239 }
2240
2241 // ------------------------------------------------------------------
2242 // CompileBroker::collect_statistics
2243 //
2244 // Collect statistics about the compilation.
2245
2246 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2247 bool success = task->is_success();
2248 methodHandle method (thread, task->method());
2249 uint compile_id = task->compile_id();
2250 bool is_osr = (task->osr_bci() != standard_entry_bci);
2251 nmethod* code = task->code();
2252 CompilerCounters* counters = thread->counters();
2253
2254 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2255 MutexLocker locker(CompileStatistics_lock);
2256
2257 // _perf variables are production performance counters which are
2258 // updated regardless of the setting of the CITime and CITimeEach flags
2259 //
2260
2261 // account all time, including bailouts and failures in this counter;
2262 // C1 and C2 counters are counting both successful and unsuccessful compiles
2263 _t_total_compilation.add(time);
2264
2265 if (!success) {
2266 _total_bailout_count++;
2267 if (UsePerfData) {
2268 _perf_last_failed_method->set_value(counters->current_method());
2269 _perf_last_failed_type->set_value(counters->compile_type());
2270 _perf_total_bailout_count->inc();
2271 }
2272 _t_bailedout_compilation.add(time);
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 _t_invalidated_compilation.add(time);
2281 } else {
2282 // Compilation succeeded
2283
2284 // update compilation ticks - used by the implementation of
2285 // java.lang.management.CompilationMBean
2286 _perf_total_compilation->inc(time.ticks());
2287 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2288
2289 if (CITime) {
2290 if (is_osr) {
2291 _t_osr_compilation.add(time);
2292 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2293 } else {
2294 _t_standard_compilation.add(time);
2295 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2296 }
2297 }
2298
2299 if (UsePerfData) {
2300 // save the name of the last method compiled
2301 _perf_last_method->set_value(counters->current_method());
2302 _perf_last_compile_type->set_value(counters->compile_type());
2303 _perf_last_compile_size->set_value(method->code_size() +
2304 task->num_inlined_bytecodes());
2305 if (is_osr) {
2306 _perf_osr_compilation->inc(time.ticks());
2307 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2308 } else {
2309 _perf_standard_compilation->inc(time.ticks());
2310 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2311 }
2312 }
2313
2314 if (CITimeEach) {
2315 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2316 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2317 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2318 }
2319
2320 // Collect counts of successful compilations
2321 _sum_nmethod_size += code->total_size();
2322 _sum_nmethod_code_size += code->insts_size();
2323 _total_compile_count++;
2324
2325 if (UsePerfData) {
2326 _perf_sum_nmethod_size->inc( code->total_size());
2327 _perf_sum_nmethod_code_size->inc(code->insts_size());
2328 _perf_total_compile_count->inc();
2329 }
2330
2331 if (is_osr) {
2332 if (UsePerfData) _perf_total_osr_compile_count->inc();
2333 _total_osr_compile_count++;
2334 } else {
2335 if (UsePerfData) _perf_total_standard_compile_count->inc();
2336 _total_standard_compile_count++;
2337 }
2338 }
2339 // set the current method for the thread to null
2340 if (UsePerfData) counters->set_current_method("");
2341 }
2342
2343 const char* CompileBroker::compiler_name(int comp_level) {
2344 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2345 if (comp == NULL) {
2346 return "no compiler";
2347 } else {
2348 return (comp->name());
2349 }
2350 }
2351
2352 void CompileBroker::print_times() {
2353 tty->cr();
2354 tty->print_cr("Accumulated compiler times");
2355 tty->print_cr("----------------------------------------------------------");
2356 //0000000000111111111122222222223333333333444444444455555555556666666666
2357 //0123456789012345678901234567890123456789012345678901234567890123456789
2358 tty->print_cr(" Total compilation time : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2359 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2360 CompileBroker::_t_standard_compilation.seconds(),
2361 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2362 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2363 CompileBroker::_t_bailedout_compilation.seconds(),
2364 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2365 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2366 CompileBroker::_t_osr_compilation.seconds(),
2367 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2368 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2369 CompileBroker::_t_invalidated_compilation.seconds(),
2370 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2371
2372 AbstractCompiler *comp = compiler(CompLevel_simple);
2373 if (comp != NULL) {
2374 tty->cr();
2375 comp->print_timers();
2376 }
2377 comp = compiler(CompLevel_full_optimization);
2378 if (comp != NULL) {
2379 tty->cr();
2380 comp->print_timers();
2381 }
2382 tty->cr();
2383 tty->print_cr(" Total compiled methods : %8d methods", CompileBroker::_total_compile_count);
2384 tty->print_cr(" Standard compilation : %8d methods", CompileBroker::_total_standard_compile_count);
2385 tty->print_cr(" On stack replacement : %8d 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 : %8d bytes", tcb);
2388 tty->print_cr(" Standard compilation : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2389 tty->print_cr(" On stack replacement : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2390 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2391 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2392 tty->cr();
2393 tty->print_cr(" nmethod code size : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2394 tty->print_cr(" nmethod total size : %8d bytes", CompileBroker::_sum_nmethod_size);
2395 }
2396
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 }
2412
2413
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 }