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 "code/dependencies.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "compiler/compileLog.hpp"
32 #include "compiler/compilerOracle.hpp"
33 #include "interpreter/linkResolver.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "oops/methodData.hpp"
36 #include "oops/method.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/nativeLookup.hpp"
39 #include "prims/whitebox.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/atomic.inline.hpp"
42 #include "runtime/compilationPolicy.hpp"
43 #include "runtime/init.hpp"
44 #include "runtime/interfaceSupport.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/sweeper.hpp"
49 #include "trace/tracing.hpp"
50 #include "utilities/dtrace.hpp"
51 #include "utilities/events.hpp"
52 #ifdef COMPILER1
53 #include "c1/c1_Compiler.hpp"
54 #endif
55 #ifdef COMPILER2
56 #include "opto/c2compiler.hpp"
57 #endif
58 #ifdef SHARK
59 #include "shark/sharkCompiler.hpp"
60 #endif
61
62 #ifdef DTRACE_ENABLED
63
64 // Only bother with this argument setup if dtrace is available
65
66 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
67 { \
68 Symbol* klass_name = (method)->klass_name(); \
69 Symbol* name = (method)->name(); \
70 Symbol* signature = (method)->signature(); \
71 HOTSPOT_METHOD_COMPILE_BEGIN( \
72 (char *) comp_name, strlen(comp_name), \
73 (char *) klass_name->bytes(), klass_name->utf8_length(), \
74 (char *) name->bytes(), name->utf8_length(), \
75 (char *) signature->bytes(), signature->utf8_length()); \
76 }
77
78 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
79 { \
80 Symbol* klass_name = (method)->klass_name(); \
81 Symbol* name = (method)->name(); \
82 Symbol* signature = (method)->signature(); \
83 HOTSPOT_METHOD_COMPILE_END( \
84 (char *) comp_name, strlen(comp_name), \
85 (char *) klass_name->bytes(), klass_name->utf8_length(), \
86 (char *) name->bytes(), name->utf8_length(), \
87 (char *) signature->bytes(), signature->utf8_length(), (success)); \
88 }
89
90 #else // ndef DTRACE_ENABLED
91
92 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
93 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
94
95 #endif // ndef DTRACE_ENABLED
96
97 bool CompileBroker::_initialized = false;
98 volatile bool CompileBroker::_should_block = false;
99 volatile jint CompileBroker::_print_compilation_warning = 0;
100 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
101
102 // The installed compiler(s)
103 AbstractCompiler* CompileBroker::_compilers[2];
104
105 // These counters are used to assign an unique ID to each compilation.
106 volatile jint CompileBroker::_compilation_id = 0;
107 volatile jint CompileBroker::_osr_compilation_id = 0;
108
109 // Debugging information
110 int CompileBroker::_last_compile_type = no_compile;
111 int CompileBroker::_last_compile_level = CompLevel_none;
112 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
113
114 // Performance counters
115 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
116 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
117 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
118
119 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
120 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
121 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
122 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
123 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
124
125 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
126 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
127 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
128 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
129
130 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
131 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
132 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
133 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
134 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
135 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
136 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
137
138 // Timers and counters for generating statistics
139 elapsedTimer CompileBroker::_t_total_compilation;
140 elapsedTimer CompileBroker::_t_osr_compilation;
141 elapsedTimer CompileBroker::_t_standard_compilation;
142 elapsedTimer CompileBroker::_t_invalidated_compilation;
143 elapsedTimer CompileBroker::_t_bailedout_compilation;
144
145 int CompileBroker::_total_bailout_count = 0;
146 int CompileBroker::_total_invalidated_count = 0;
147 int CompileBroker::_total_compile_count = 0;
148 int CompileBroker::_total_osr_compile_count = 0;
149 int CompileBroker::_total_standard_compile_count = 0;
150
151 int CompileBroker::_sum_osr_bytes_compiled = 0;
152 int CompileBroker::_sum_standard_bytes_compiled = 0;
153 int CompileBroker::_sum_nmethod_size = 0;
154 int CompileBroker::_sum_nmethod_code_size = 0;
155
156 long CompileBroker::_peak_compilation_time = 0;
157
158 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
159 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
160
161
162 class CompilationLog : public StringEventLog {
163 public:
164 CompilationLog() : StringEventLog("Compilation events") {
165 }
166
167 void log_compile(JavaThread* thread, CompileTask* task) {
168 StringLogMessage lm;
169 stringStream sstr = lm.stream();
170 // msg.time_stamp().update_to(tty->time_stamp().ticks());
171 task->print_compilation(&sstr, NULL, true, false);
172 log(thread, "%s", (const char*)lm);
173 }
174
175 void log_nmethod(JavaThread* thread, nmethod* nm) {
176 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
177 nm->compile_id(), nm->is_osr_method() ? "%" : "",
178 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
179 }
180
181 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
182 StringLogMessage lm;
183 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
184 if (retry_message != NULL) {
185 lm.append(" (%s)", retry_message);
186 }
187 lm.print("\n");
188 log(thread, "%s", (const char*)lm);
189 }
190
191 void log_metaspace_failure(const char* reason) {
192 ResourceMark rm;
193 StringLogMessage lm;
194 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
195 lm.print("\n");
196 log(JavaThread::current(), "%s", (const char*)lm);
197 }
198 };
199
200 static CompilationLog* _compilation_log = NULL;
201
202 void compileBroker_init() {
203 if (LogEvents) {
204 _compilation_log = new CompilationLog();
205 }
206 }
207
208 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
209 CompilerThread* thread = CompilerThread::current();
210 thread->set_task(task);
211 CompileLog* log = thread->log();
212 if (log != NULL) task->log_task_start(log);
213 }
214
215 CompileTaskWrapper::~CompileTaskWrapper() {
216 CompilerThread* thread = CompilerThread::current();
217 CompileTask* task = thread->task();
218 CompileLog* log = thread->log();
219 if (log != NULL) task->log_task_done(log);
220 thread->set_task(NULL);
221 task->set_code_handle(NULL);
222 thread->set_env(NULL);
223 if (task->is_blocking()) {
224 MutexLocker notifier(task->lock(), thread);
225 task->mark_complete();
226 // Notify the waiting thread that the compilation has completed.
227 task->lock()->notify_all();
228 } else {
229 task->mark_complete();
230
231 // By convention, the compiling thread is responsible for
232 // recycling a non-blocking CompileTask.
233 CompileTask::free(task);
234 }
235 }
236
237
238 CompileTask* CompileTask::_task_free_list = NULL;
239 #ifdef ASSERT
240 int CompileTask::_num_allocated_tasks = 0;
241 #endif
242 /**
243 * Allocate a CompileTask, from the free list if possible.
244 */
245 CompileTask* CompileTask::allocate() {
246 MutexLocker locker(CompileTaskAlloc_lock);
247 CompileTask* task = NULL;
248
249 if (_task_free_list != NULL) {
250 task = _task_free_list;
251 _task_free_list = task->next();
252 task->set_next(NULL);
253 } else {
254 task = new CompileTask();
255 DEBUG_ONLY(_num_allocated_tasks++;)
256 assert (WhiteBoxAPI || _num_allocated_tasks < 10000, "Leaking compilation tasks?");
257 task->set_next(NULL);
258 task->set_is_free(true);
259 }
260 assert(task->is_free(), "Task must be free.");
261 task->set_is_free(false);
262 return task;
263 }
264
265
266 /**
267 * Add a task to the free list.
268 */
269 void CompileTask::free(CompileTask* task) {
270 MutexLocker locker(CompileTaskAlloc_lock);
271 if (!task->is_free()) {
272 task->set_code(NULL);
273 assert(!task->lock()->is_locked(), "Should not be locked when freed");
274 JNIHandles::destroy_global(task->_method_holder);
275 JNIHandles::destroy_global(task->_hot_method_holder);
276
277 task->set_is_free(true);
278 task->set_next(_task_free_list);
279 _task_free_list = task;
280 }
281 }
282
283 void CompileTask::initialize(int compile_id,
284 methodHandle method,
285 int osr_bci,
286 int comp_level,
287 methodHandle hot_method,
288 int hot_count,
289 const char* comment,
290 bool is_blocking) {
291 assert(!_lock->is_locked(), "bad locking");
292
293 _compile_id = compile_id;
294 _method = method();
295 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
296 _osr_bci = osr_bci;
297 _is_blocking = is_blocking;
298 _comp_level = comp_level;
299 _num_inlined_bytecodes = 0;
300
301 _is_complete = false;
302 _is_success = false;
303 _code_handle = NULL;
304
305 _hot_method = NULL;
306 _hot_method_holder = NULL;
307 _hot_count = hot_count;
308 _time_queued = 0; // tidy
309 _comment = comment;
310 _failure_reason = NULL;
311
312 if (LogCompilation) {
313 _time_queued = os::elapsed_counter();
314 if (hot_method.not_null()) {
315 if (hot_method == method) {
316 _hot_method = _method;
317 } else {
318 _hot_method = hot_method();
319 // only add loader or mirror if different from _method_holder
320 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
321 }
322 }
323 }
324
325 _next = NULL;
326 }
327
328 // ------------------------------------------------------------------
329 // CompileTask::code/set_code
330 nmethod* CompileTask::code() const {
331 if (_code_handle == NULL) return NULL;
332 return _code_handle->code();
333 }
334 void CompileTask::set_code(nmethod* nm) {
335 if (_code_handle == NULL && nm == NULL) return;
336 guarantee(_code_handle != NULL, "");
337 _code_handle->set_code(nm);
338 if (nm == NULL) _code_handle = NULL; // drop the handle also
339 }
340
341 void CompileTask::mark_on_stack() {
342 // Mark these methods as something redefine classes cannot remove.
343 _method->set_on_stack(true);
344 if (_hot_method != NULL) {
345 _hot_method->set_on_stack(true);
346 }
347 }
348
349 // ------------------------------------------------------------------
350 // CompileTask::print_line_on_error
351 //
352 // This function is called by fatal error handler when the thread
353 // causing troubles is a compiler thread.
354 //
355 // Do not grab any lock, do not allocate memory.
356 //
357 // Otherwise it's the same as CompileTask::print_line()
358 //
359 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
360 // print compiler name
361 st->print("%s:", CompileBroker::compiler_name(comp_level()));
362 print_compilation(st);
363 }
364
365 // ------------------------------------------------------------------
366 // CompileTask::print_line
367 void CompileTask::print_tty() {
368 ttyLocker ttyl; // keep the following output all in one block
369 // print compiler name if requested
370 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
371 print_compilation(tty);
372 }
373
374 // ------------------------------------------------------------------
375 // CompileTask::print_compilation_impl
376 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
377 bool is_osr_method, int osr_bci, bool is_blocking,
378 const char* msg, bool short_form, bool cr) {
379 if (!short_form) {
380 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
381 }
382 st->print("%4d ", compile_id); // print compilation number
383
384 // For unloaded methods the transition to zombie occurs after the
385 // method is cleared so it's impossible to report accurate
386 // information for that case.
387 bool is_synchronized = false;
388 bool has_exception_handler = false;
389 bool is_native = false;
390 if (method != NULL) {
391 is_synchronized = method->is_synchronized();
392 has_exception_handler = method->has_exception_handler();
393 is_native = method->is_native();
394 }
395 // method attributes
396 const char compile_type = is_osr_method ? '%' : ' ';
397 const char sync_char = is_synchronized ? 's' : ' ';
398 const char exception_char = has_exception_handler ? '!' : ' ';
399 const char blocking_char = is_blocking ? 'b' : ' ';
400 const char native_char = is_native ? 'n' : ' ';
401
402 // print method attributes
403 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
404
405 if (TieredCompilation) {
406 if (comp_level != -1) st->print("%d ", comp_level);
407 else st->print("- ");
408 }
409 st->print(" "); // more indent
410
411 if (method == NULL) {
412 st->print("(method)");
413 } else {
414 method->print_short_name(st);
415 if (is_osr_method) {
416 st->print(" @ %d", osr_bci);
417 }
418 if (method->is_native())
419 st->print(" (native)");
420 else
421 st->print(" (%d bytes)", method->code_size());
422 }
423
424 if (msg != NULL) {
425 st->print(" %s", msg);
426 }
427 if (cr) {
428 st->cr();
429 }
430 }
431
432 // ------------------------------------------------------------------
433 // CompileTask::print_inlining
434 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
435 // 1234567
436 st->print(" "); // print timestamp
437 // 1234
438 st->print(" "); // print compilation number
439
440 // method attributes
441 if (method->is_loaded()) {
442 const char sync_char = method->is_synchronized() ? 's' : ' ';
443 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
444 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
445
446 // print method attributes
447 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
448 } else {
449 // %s!bn
450 st->print(" "); // print method attributes
451 }
452
453 if (TieredCompilation) {
454 st->print(" ");
455 }
456 st->print(" "); // more indent
457 st->print(" "); // initial inlining indent
458
459 for (int i = 0; i < inline_level; i++) st->print(" ");
460
461 st->print("@ %d ", bci); // print bci
462 method->print_short_name(st);
463 if (method->is_loaded())
464 st->print(" (%d bytes)", method->code_size());
465 else
466 st->print(" (not loaded)");
467
468 if (msg != NULL) {
469 st->print(" %s", msg);
470 }
471 st->cr();
472 }
473
474 // ------------------------------------------------------------------
475 // CompileTask::print_inline_indent
476 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
477 // 1234567
478 st->print(" "); // print timestamp
479 // 1234
480 st->print(" "); // print compilation number
481 // %s!bn
482 st->print(" "); // print method attributes
483 if (TieredCompilation) {
484 st->print(" ");
485 }
486 st->print(" "); // more indent
487 st->print(" "); // initial inlining indent
488 for (int i = 0; i < inline_level; i++) st->print(" ");
489 }
490
491 // ------------------------------------------------------------------
492 // CompileTask::print_compilation
493 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
494 bool is_osr_method = osr_bci() != InvocationEntryBci;
495 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
496 }
497
498 // ------------------------------------------------------------------
499 // CompileTask::log_task
500 void CompileTask::log_task(xmlStream* log) {
501 Thread* thread = Thread::current();
502 methodHandle method(thread, this->method());
503 ResourceMark rm(thread);
504
505 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
506 log->print(" compile_id='%d'", _compile_id);
507 if (_osr_bci != CompileBroker::standard_entry_bci) {
508 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
509 } // else compile_kind='c2c'
510 if (!method.is_null()) log->method(method);
511 if (_osr_bci != CompileBroker::standard_entry_bci) {
512 log->print(" osr_bci='%d'", _osr_bci);
513 }
514 if (_comp_level != CompLevel_highest_tier) {
515 log->print(" level='%d'", _comp_level);
516 }
517 if (_is_blocking) {
518 log->print(" blocking='1'");
519 }
520 log->stamp();
521 }
522
523
524 // ------------------------------------------------------------------
525 // CompileTask::log_task_queued
526 void CompileTask::log_task_queued() {
527 Thread* thread = Thread::current();
528 ttyLocker ttyl;
529 ResourceMark rm(thread);
530
531 xtty->begin_elem("task_queued");
532 log_task(xtty);
533 if (_comment != NULL) {
534 xtty->print(" comment='%s'", _comment);
535 }
536 if (_hot_method != NULL) {
537 methodHandle hot(thread, _hot_method);
538 methodHandle method(thread, _method);
539 if (hot() != method()) {
540 xtty->method(hot);
541 }
542 }
543 if (_hot_count != 0) {
544 xtty->print(" hot_count='%d'", _hot_count);
545 }
546 xtty->end_elem();
547 }
548
549
550 // ------------------------------------------------------------------
551 // CompileTask::log_task_start
552 void CompileTask::log_task_start(CompileLog* log) {
553 log->begin_head("task");
554 log_task(log);
555 log->end_head();
556 }
557
558
559 // ------------------------------------------------------------------
560 // CompileTask::log_task_done
561 void CompileTask::log_task_done(CompileLog* log) {
562 Thread* thread = Thread::current();
563 methodHandle method(thread, this->method());
564 ResourceMark rm(thread);
565
566 if (!_is_success) {
567 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
568 log->elem("failure reason='%s'", reason);
569 }
570
571 // <task_done ... stamp='1.234'> </task>
572 nmethod* nm = code();
573 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
574 _is_success, nm == NULL ? 0 : nm->content_size(),
575 method->invocation_count());
576 int bec = method->backedge_count();
577 if (bec != 0) log->print(" backedge_count='%d'", bec);
578 // Note: "_is_complete" is about to be set, but is not.
579 if (_num_inlined_bytecodes != 0) {
580 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
581 }
582 log->stamp();
583 log->end_elem();
584 log->tail("task");
585 log->clear_identities(); // next task will have different CI
586 if (log->unflushed_count() > 2000) {
587 log->flush();
588 }
589 log->mark_file_end();
590 }
591
592
593
594 /**
595 * Add a CompileTask to a CompileQueue.
596 */
597 void CompileQueue::add(CompileTask* task) {
598 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
599
600 task->set_next(NULL);
601 task->set_prev(NULL);
602
603 if (_last == NULL) {
604 // The compile queue is empty.
605 assert(_first == NULL, "queue is empty");
606 _first = task;
607 _last = task;
608 } else {
609 // Append the task to the queue.
610 assert(_last->next() == NULL, "not last");
611 _last->set_next(task);
612 task->set_prev(_last);
613 _last = task;
614 }
615 ++_size;
616
617 // Mark the method as being in the compile queue.
618 task->method()->set_queued_for_compilation();
619
620 if (CIPrintCompileQueue) {
621 print_tty();
622 }
623
624 if (LogCompilation && xtty != NULL) {
625 task->log_task_queued();
626 }
627
628 // Notify CompilerThreads that a task is available.
629 MethodCompileQueue_lock->notify_all();
630 }
631
632 /**
633 * Empties compilation queue by putting all compilation tasks onto
634 * a freelist. Furthermore, the method wakes up all threads that are
635 * waiting on a compilation task to finish. This can happen if background
636 * compilation is disabled.
637 */
638 void CompileQueue::free_all() {
639 MutexLocker mu(MethodCompileQueue_lock);
640 CompileTask* next = _first;
641
642 // Iterate over all tasks in the compile queue
643 while (next != NULL) {
644 CompileTask* current = next;
645 next = current->next();
646 {
647 // Wake up thread that blocks on the compile task.
648 MutexLocker ct_lock(current->lock());
649 current->lock()->notify();
650 }
651 // Put the task back on the freelist.
652 CompileTask::free(current);
653 }
654 _first = NULL;
655
656 // Wake up all threads that block on the queue.
657 MethodCompileQueue_lock->notify_all();
658 }
659
660 /**
661 * Get the next CompileTask from a CompileQueue
662 */
663 CompileTask* CompileQueue::get() {
664 MutexLocker locker(MethodCompileQueue_lock);
665 // If _first is NULL we have no more compile jobs. There are two reasons for
666 // having no compile jobs: First, we compiled everything we wanted. Second,
667 // we ran out of code cache so compilation has been disabled. In the latter
668 // case we perform code cache sweeps to free memory such that we can re-enable
669 // compilation.
670 while (_first == NULL) {
671 // Exit loop if compilation is disabled forever
672 if (CompileBroker::is_compilation_disabled_forever()) {
673 return NULL;
674 }
675
676 // If there are no compilation tasks and we can compile new jobs
677 // (i.e., there is enough free space in the code cache) there is
678 // no need to invoke the sweeper. As a result, the hotness of methods
679 // remains unchanged. This behavior is desired, since we want to keep
680 // the stable state, i.e., we do not want to evict methods from the
681 // code cache if it is unnecessary.
682 // We need a timed wait here, since compiler threads can exit if compilation
683 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
684 // is not critical and we do not want idle compiler threads to wake up too often.
685 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
686 }
687
688 if (CompileBroker::is_compilation_disabled_forever()) {
689 return NULL;
690 }
691
692 CompileTask* task;
693 {
694 No_Safepoint_Verifier nsv;
695 task = CompilationPolicy::policy()->select_task(this);
696 }
697 remove(task);
698 purge_stale_tasks(); // may temporarily release MCQ lock
699 return task;
700 }
701
702 // Clean & deallocate stale compile tasks.
703 // Temporarily releases MethodCompileQueue lock.
704 void CompileQueue::purge_stale_tasks() {
705 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
706 if (_first_stale != NULL) {
707 // Stale tasks are purged when MCQ lock is released,
708 // but _first_stale updates are protected by MCQ lock.
709 // Once task processing starts and MCQ lock is released,
710 // other compiler threads can reuse _first_stale.
711 CompileTask* head = _first_stale;
712 _first_stale = NULL;
713 {
714 MutexUnlocker ul(MethodCompileQueue_lock);
715 for (CompileTask* task = head; task != NULL; ) {
716 CompileTask* next_task = task->next();
717 CompileTaskWrapper ctw(task); // Frees the task
718 task->set_failure_reason("stale task");
719 task = next_task;
720 }
721 }
722 }
723 }
724
725 void CompileQueue::remove(CompileTask* task) {
726 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
727 if (task->prev() != NULL) {
728 task->prev()->set_next(task->next());
729 } else {
730 // max is the first element
731 assert(task == _first, "Sanity");
732 _first = task->next();
733 }
734
735 if (task->next() != NULL) {
736 task->next()->set_prev(task->prev());
737 } else {
738 // max is the last element
739 assert(task == _last, "Sanity");
740 _last = task->prev();
741 }
742 --_size;
743 }
744
745 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
746 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
747 remove(task);
748
749 // Enqueue the task for reclamation (should be done outside MCQ lock)
750 task->set_next(_first_stale);
751 task->set_prev(NULL);
752 _first_stale = task;
753 }
754
755 // methods in the compile queue need to be marked as used on the stack
756 // so that they don't get reclaimed by Redefine Classes
757 void CompileQueue::mark_on_stack() {
758 CompileTask* task = _first;
759 while (task != NULL) {
760 task->mark_on_stack();
761 task = task->next();
762 }
763 }
764
765
766 CompileQueue* CompileBroker::compile_queue(int comp_level) {
767 if (is_c2_compile(comp_level)) return _c2_compile_queue;
768 if (is_c1_compile(comp_level)) return _c1_compile_queue;
769 return NULL;
770 }
771
772
773 void CompileBroker::print_compile_queues(outputStream* st) {
774 MutexLocker locker(MethodCompileQueue_lock);
775 if (_c1_compile_queue != NULL) {
776 _c1_compile_queue->print(st);
777 }
778 if (_c2_compile_queue != NULL) {
779 _c2_compile_queue->print(st);
780 }
781 }
782
783 void CompileQueue::print(outputStream* st) {
784 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
785 st->print_cr("Contents of %s", name());
786 st->print_cr("----------------------------");
787 CompileTask* task = _first;
788 if (task == NULL) {
789 st->print_cr("Empty");
790 } else {
791 while (task != NULL) {
792 task->print_compilation(st, NULL, true, true);
793 task = task->next();
794 }
795 }
796 st->print_cr("----------------------------");
797 }
798
799 void CompileQueue::print_tty() {
800 ttyLocker ttyl;
801 print(tty);
802 }
803
804 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
805
806 _current_method[0] = '\0';
807 _compile_type = CompileBroker::no_compile;
808
809 if (UsePerfData) {
810 ResourceMark rm;
811
812 // create the thread instance name space string - don't create an
813 // instance subspace if instance is -1 - keeps the adapterThread
814 // counters from having a ".0" namespace.
815 const char* thread_i = (instance == -1) ? thread_name :
816 PerfDataManager::name_space(thread_name, instance);
817
818
819 char* name = PerfDataManager::counter_name(thread_i, "method");
820 _perf_current_method =
821 PerfDataManager::create_string_variable(SUN_CI, name,
822 cmname_buffer_length,
823 _current_method, CHECK);
824
825 name = PerfDataManager::counter_name(thread_i, "type");
826 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
827 PerfData::U_None,
828 (jlong)_compile_type,
829 CHECK);
830
831 name = PerfDataManager::counter_name(thread_i, "time");
832 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
833 PerfData::U_Ticks, CHECK);
834
835 name = PerfDataManager::counter_name(thread_i, "compiles");
836 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
837 PerfData::U_Events, CHECK);
838 }
839 }
840
841 // ------------------------------------------------------------------
842 // CompileBroker::compilation_init
843 //
844 // Initialize the Compilation object
845 void CompileBroker::compilation_init() {
846 _last_method_compiled[0] = '\0';
847
848 // No need to initialize compilation system if we do not use it.
849 if (!UseCompiler) {
850 return;
851 }
852 #ifndef SHARK
853 // Set the interface to the current compiler(s).
854 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
855 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
856 #ifdef COMPILER1
857 if (c1_count > 0) {
858 _compilers[0] = new Compiler();
859 }
860 #endif // COMPILER1
861
862 #ifdef COMPILER2
863 if (c2_count > 0) {
864 _compilers[1] = new C2Compiler();
865 }
866 #endif // COMPILER2
867
868 #else // SHARK
869 int c1_count = 0;
870 int c2_count = 1;
871
872 _compilers[1] = new SharkCompiler();
873 #endif // SHARK
874
875 // Start the compiler thread(s) and the sweeper thread
876 init_compiler_sweeper_threads(c1_count, c2_count);
877 // totalTime performance counter is always created as it is required
878 // by the implementation of java.lang.management.CompilationMBean.
879 {
880 EXCEPTION_MARK;
881 _perf_total_compilation =
882 PerfDataManager::create_counter(JAVA_CI, "totalTime",
883 PerfData::U_Ticks, CHECK);
884 }
885
886
887 if (UsePerfData) {
888
889 EXCEPTION_MARK;
890
891 // create the jvmstat performance counters
892 _perf_osr_compilation =
893 PerfDataManager::create_counter(SUN_CI, "osrTime",
894 PerfData::U_Ticks, CHECK);
895
896 _perf_standard_compilation =
897 PerfDataManager::create_counter(SUN_CI, "standardTime",
898 PerfData::U_Ticks, CHECK);
899
900 _perf_total_bailout_count =
901 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
902 PerfData::U_Events, CHECK);
903
904 _perf_total_invalidated_count =
905 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
906 PerfData::U_Events, CHECK);
907
908 _perf_total_compile_count =
909 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
910 PerfData::U_Events, CHECK);
911 _perf_total_osr_compile_count =
912 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
913 PerfData::U_Events, CHECK);
914
915 _perf_total_standard_compile_count =
916 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
917 PerfData::U_Events, CHECK);
918
919 _perf_sum_osr_bytes_compiled =
920 PerfDataManager::create_counter(SUN_CI, "osrBytes",
921 PerfData::U_Bytes, CHECK);
922
923 _perf_sum_standard_bytes_compiled =
924 PerfDataManager::create_counter(SUN_CI, "standardBytes",
925 PerfData::U_Bytes, CHECK);
926
927 _perf_sum_nmethod_size =
928 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
929 PerfData::U_Bytes, CHECK);
930
931 _perf_sum_nmethod_code_size =
932 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
933 PerfData::U_Bytes, CHECK);
934
935 _perf_last_method =
936 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
937 CompilerCounters::cmname_buffer_length,
938 "", CHECK);
939
940 _perf_last_failed_method =
941 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
942 CompilerCounters::cmname_buffer_length,
943 "", CHECK);
944
945 _perf_last_invalidated_method =
946 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
947 CompilerCounters::cmname_buffer_length,
948 "", CHECK);
949
950 _perf_last_compile_type =
951 PerfDataManager::create_variable(SUN_CI, "lastType",
952 PerfData::U_None,
953 (jlong)CompileBroker::no_compile,
954 CHECK);
955
956 _perf_last_compile_size =
957 PerfDataManager::create_variable(SUN_CI, "lastSize",
958 PerfData::U_Bytes,
959 (jlong)CompileBroker::no_compile,
960 CHECK);
961
962
963 _perf_last_failed_type =
964 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
965 PerfData::U_None,
966 (jlong)CompileBroker::no_compile,
967 CHECK);
968
969 _perf_last_invalidated_type =
970 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
971 PerfData::U_None,
972 (jlong)CompileBroker::no_compile,
973 CHECK);
974
975 Dependencies::_perf_dependency_checking_time =
976 PerfDataManager::create_counter(SUN_CI, "NMethodDependenciesCheckingTime",
977 PerfData::U_Ticks, CHECK);
978
979 Dependencies::_perf_dependencies_checked_count =
980 PerfDataManager::create_counter(SUN_CI, "NMethodDependenciesCheckedCount",
981 PerfData::U_Events, CHECK);
982
983 Dependencies::_perf_dependencies_invalidated =
984 PerfDataManager::create_counter(SUN_CI, "NMethodDependenciesInvalidated",
985 PerfData::U_Events, CHECK);
986
987 Dependencies::_perf_dependencies_total_count =
988 PerfDataManager::create_counter(SUN_CI, "NMethodDependenciesTotalCount",
989 PerfData::U_Events, CHECK);
990
991 Dependencies::_perf_dependencies_context_traversals =
992 PerfDataManager::create_counter(SUN_CI, "NMethodDependenciesContextTraversals",
993 PerfData::U_Events, CHECK);
994 }
995
996 _initialized = true;
997 }
998
999
1000 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1001 AbstractCompiler* comp, bool compiler_thread, TRAPS) {
1002 JavaThread* thread = NULL;
1003 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
1004 instanceKlassHandle klass (THREAD, k);
1005 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1006 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1007
1008 // Initialize thread_oop to put it into the system threadGroup
1009 Handle thread_group (THREAD, Universe::system_thread_group());
1010 JavaValue result(T_VOID);
1011 JavaCalls::call_special(&result, thread_oop,
1012 klass,
1013 vmSymbols::object_initializer_name(),
1014 vmSymbols::threadgroup_string_void_signature(),
1015 thread_group,
1016 string,
1017 CHECK_0);
1018
1019 {
1020 MutexLocker mu(Threads_lock, THREAD);
1021 if (compiler_thread) {
1022 thread = new CompilerThread(queue, counters);
1023 } else {
1024 thread = new CodeCacheSweeperThread();
1025 }
1026 // At this point the new CompilerThread data-races with this startup
1027 // thread (which I believe is the primoridal thread and NOT the VM
1028 // thread). This means Java bytecodes being executed at startup can
1029 // queue compile jobs which will run at whatever default priority the
1030 // newly created CompilerThread runs at.
1031
1032
1033 // At this point it may be possible that no osthread was created for the
1034 // JavaThread due to lack of memory. We would have to throw an exception
1035 // in that case. However, since this must work and we do not allow
1036 // exceptions anyway, check and abort if this fails.
1037
1038 if (thread == NULL || thread->osthread() == NULL) {
1039 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1040 os::native_thread_creation_failed_msg());
1041 }
1042
1043 java_lang_Thread::set_thread(thread_oop(), thread);
1044
1045 // Note that this only sets the JavaThread _priority field, which by
1046 // definition is limited to Java priorities and not OS priorities.
1047 // The os-priority is set in the CompilerThread startup code itself
1048
1049 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1050
1051 // Note that we cannot call os::set_priority because it expects Java
1052 // priorities and we are *explicitly* using OS priorities so that it's
1053 // possible to set the compiler thread priority higher than any Java
1054 // thread.
1055
1056 int native_prio = CompilerThreadPriority;
1057 if (native_prio == -1) {
1058 if (UseCriticalCompilerThreadPriority) {
1059 native_prio = os::java_to_os_priority[CriticalPriority];
1060 } else {
1061 native_prio = os::java_to_os_priority[NearMaxPriority];
1062 }
1063 }
1064 os::set_native_priority(thread, native_prio);
1065
1066 java_lang_Thread::set_daemon(thread_oop());
1067
1068 thread->set_threadObj(thread_oop());
1069 if (compiler_thread) {
1070 thread->as_CompilerThread()->set_compiler(comp);
1071 }
1072 Threads::add(thread);
1073 Thread::start(thread);
1074 }
1075
1076 // Let go of Threads_lock before yielding
1077 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1078
1079 return thread;
1080 }
1081
1082
1083 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
1084 EXCEPTION_MARK;
1085 #if !defined(ZERO) && !defined(SHARK)
1086 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1087 #endif // !ZERO && !SHARK
1088 // Initialize the compilation queue
1089 if (c2_compiler_count > 0) {
1090 _c2_compile_queue = new CompileQueue("C2 compile queue");
1091 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1092 }
1093 if (c1_compiler_count > 0) {
1094 _c1_compile_queue = new CompileQueue("C1 compile queue");
1095 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1096 }
1097
1098 int compiler_count = c1_compiler_count + c2_compiler_count;
1099
1100 char name_buffer[256];
1101 const bool compiler_thread = true;
1102 for (int i = 0; i < c2_compiler_count; i++) {
1103 // Create a name for our thread.
1104 sprintf(name_buffer, "C2 CompilerThread%d", i);
1105 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1106 // Shark and C2
1107 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
1108 }
1109
1110 for (int i = c2_compiler_count; i < compiler_count; i++) {
1111 // Create a name for our thread.
1112 sprintf(name_buffer, "C1 CompilerThread%d", i);
1113 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1114 // C1
1115 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
1116 }
1117
1118 if (UsePerfData) {
1119 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1120 }
1121
1122 if (MethodFlushing) {
1123 // Initialize the sweeper thread
1124 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
1125 }
1126 }
1127
1128
1129 /**
1130 * Set the methods on the stack as on_stack so that redefine classes doesn't
1131 * reclaim them. This method is executed at a safepoint.
1132 */
1133 void CompileBroker::mark_on_stack() {
1134 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1135 // Since we are at a safepoint, we do not need a lock to access
1136 // the compile queues.
1137 if (_c2_compile_queue != NULL) {
1138 _c2_compile_queue->mark_on_stack();
1139 }
1140 if (_c1_compile_queue != NULL) {
1141 _c1_compile_queue->mark_on_stack();
1142 }
1143 }
1144
1145 // ------------------------------------------------------------------
1146 // CompileBroker::compile_method
1147 //
1148 // Request compilation of a method.
1149 void CompileBroker::compile_method_base(methodHandle method,
1150 int osr_bci,
1151 int comp_level,
1152 methodHandle hot_method,
1153 int hot_count,
1154 const char* comment,
1155 Thread* thread) {
1156 // do nothing if compiler thread(s) is not available
1157 if (!_initialized) {
1158 return;
1159 }
1160
1161 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1162 assert(method->method_holder()->oop_is_instance(),
1163 "sanity check");
1164 assert(!method->method_holder()->is_not_initialized(),
1165 "method holder must be initialized");
1166 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1167
1168 if (CIPrintRequests) {
1169 tty->print("request: ");
1170 method->print_short_name(tty);
1171 if (osr_bci != InvocationEntryBci) {
1172 tty->print(" osr_bci: %d", osr_bci);
1173 }
1174 tty->print(" comment: %s count: %d", comment, hot_count);
1175 if (!hot_method.is_null()) {
1176 tty->print(" hot: ");
1177 if (hot_method() != method()) {
1178 hot_method->print_short_name(tty);
1179 } else {
1180 tty->print("yes");
1181 }
1182 }
1183 tty->cr();
1184 }
1185
1186 // A request has been made for compilation. Before we do any
1187 // real work, check to see if the method has been compiled
1188 // in the meantime with a definitive result.
1189 if (compilation_is_complete(method, osr_bci, comp_level)) {
1190 return;
1191 }
1192
1193 #ifndef PRODUCT
1194 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1195 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1196 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1197 return;
1198 }
1199 }
1200 #endif
1201
1202 // If this method is already in the compile queue, then
1203 // we do not block the current thread.
1204 if (compilation_is_in_queue(method)) {
1205 // We may want to decay our counter a bit here to prevent
1206 // multiple denied requests for compilation. This is an
1207 // open compilation policy issue. Note: The other possibility,
1208 // in the case that this is a blocking compile request, is to have
1209 // all subsequent blocking requesters wait for completion of
1210 // ongoing compiles. Note that in this case we'll need a protocol
1211 // for freeing the associated compile tasks. [Or we could have
1212 // a single static monitor on which all these waiters sleep.]
1213 return;
1214 }
1215
1216 // If the requesting thread is holding the pending list lock
1217 // then we just return. We can't risk blocking while holding
1218 // the pending list lock or a 3-way deadlock may occur
1219 // between the reference handler thread, a GC (instigated
1220 // by a compiler thread), and compiled method registration.
1221 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1222 return;
1223 }
1224
1225 if (TieredCompilation) {
1226 // Tiered policy requires MethodCounters to exist before adding a method to
1227 // the queue. Create if we don't have them yet.
1228 method->get_method_counters(thread);
1229 }
1230
1231 // Outputs from the following MutexLocker block:
1232 CompileTask* task = NULL;
1233 bool blocking = false;
1234 CompileQueue* queue = compile_queue(comp_level);
1235
1236 // Acquire our lock.
1237 {
1238 MutexLocker locker(MethodCompileQueue_lock, thread);
1239
1240 // Make sure the method has not slipped into the queues since
1241 // last we checked; note that those checks were "fast bail-outs".
1242 // Here we need to be more careful, see 14012000 below.
1243 if (compilation_is_in_queue(method)) {
1244 return;
1245 }
1246
1247 // We need to check again to see if the compilation has
1248 // completed. A previous compilation may have registered
1249 // some result.
1250 if (compilation_is_complete(method, osr_bci, comp_level)) {
1251 return;
1252 }
1253
1254 // We now know that this compilation is not pending, complete,
1255 // or prohibited. Assign a compile_id to this compilation
1256 // and check to see if it is in our [Start..Stop) range.
1257 int compile_id = assign_compile_id(method, osr_bci);
1258 if (compile_id == 0) {
1259 // The compilation falls outside the allowed range.
1260 return;
1261 }
1262
1263 // Should this thread wait for completion of the compile?
1264 blocking = is_compile_blocking();
1265
1266 // We will enter the compilation in the queue.
1267 // 14012000: Note that this sets the queued_for_compile bits in
1268 // the target method. We can now reason that a method cannot be
1269 // queued for compilation more than once, as follows:
1270 // Before a thread queues a task for compilation, it first acquires
1271 // the compile queue lock, then checks if the method's queued bits
1272 // are set or it has already been compiled. Thus there can not be two
1273 // instances of a compilation task for the same method on the
1274 // compilation queue. Consider now the case where the compilation
1275 // thread has already removed a task for that method from the queue
1276 // and is in the midst of compiling it. In this case, the
1277 // queued_for_compile bits must be set in the method (and these
1278 // will be visible to the current thread, since the bits were set
1279 // under protection of the compile queue lock, which we hold now.
1280 // When the compilation completes, the compiler thread first sets
1281 // the compilation result and then clears the queued_for_compile
1282 // bits. Neither of these actions are protected by a barrier (or done
1283 // under the protection of a lock), so the only guarantee we have
1284 // (on machines with TSO (Total Store Order)) is that these values
1285 // will update in that order. As a result, the only combinations of
1286 // these bits that the current thread will see are, in temporal order:
1287 // <RESULT, QUEUE> :
1288 // <0, 1> : in compile queue, but not yet compiled
1289 // <1, 1> : compiled but queue bit not cleared
1290 // <1, 0> : compiled and queue bit cleared
1291 // Because we first check the queue bits then check the result bits,
1292 // we are assured that we cannot introduce a duplicate task.
1293 // Note that if we did the tests in the reverse order (i.e. check
1294 // result then check queued bit), we could get the result bit before
1295 // the compilation completed, and the queue bit after the compilation
1296 // completed, and end up introducing a "duplicate" (redundant) task.
1297 // In that case, the compiler thread should first check if a method
1298 // has already been compiled before trying to compile it.
1299 // NOTE: in the event that there are multiple compiler threads and
1300 // there is de-optimization/recompilation, things will get hairy,
1301 // and in that case it's best to protect both the testing (here) of
1302 // these bits, and their updating (here and elsewhere) under a
1303 // common lock.
1304 task = create_compile_task(queue,
1305 compile_id, method,
1306 osr_bci, comp_level,
1307 hot_method, hot_count, comment,
1308 blocking);
1309 }
1310
1311 if (blocking) {
1312 wait_for_completion(task);
1313 }
1314 }
1315
1316
1317 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1318 int comp_level,
1319 methodHandle hot_method, int hot_count,
1320 const char* comment, Thread* THREAD) {
1321 // make sure arguments make sense
1322 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1323 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1324 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1325 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1326 // allow any levels for WhiteBox
1327 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1328 // return quickly if possible
1329
1330 // lock, make sure that the compilation
1331 // isn't prohibited in a straightforward way.
1332 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1333 if (comp == NULL || !comp->can_compile_method(method) ||
1334 compilation_is_prohibited(method, osr_bci, comp_level)) {
1335 return NULL;
1336 }
1337
1338 if (osr_bci == InvocationEntryBci) {
1339 // standard compilation
1340 nmethod* method_code = method->code();
1341 if (method_code != NULL) {
1342 if (compilation_is_complete(method, osr_bci, comp_level)) {
1343 return method_code;
1344 }
1345 }
1346 if (method->is_not_compilable(comp_level)) {
1347 return NULL;
1348 }
1349 } else {
1350 // osr compilation
1351 #ifndef TIERED
1352 // seems like an assert of dubious value
1353 assert(comp_level == CompLevel_highest_tier,
1354 "all OSR compiles are assumed to be at a single compilation lavel");
1355 #endif // TIERED
1356 // We accept a higher level osr method
1357 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1358 if (nm != NULL) return nm;
1359 if (method->is_not_osr_compilable(comp_level)) return NULL;
1360 }
1361
1362 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1363 // some prerequisites that are compiler specific
1364 if (comp->is_c2() || comp->is_shark()) {
1365 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1366 // Resolve all classes seen in the signature of the method
1367 // we are compiling.
1368 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1369 }
1370
1371 // If the method is native, do the lookup in the thread requesting
1372 // the compilation. Native lookups can load code, which is not
1373 // permitted during compilation.
1374 //
1375 // Note: A native method implies non-osr compilation which is
1376 // checked with an assertion at the entry of this method.
1377 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1378 bool in_base_library;
1379 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1380 if (HAS_PENDING_EXCEPTION) {
1381 // In case of an exception looking up the method, we just forget
1382 // about it. The interpreter will kick-in and throw the exception.
1383 method->set_not_compilable(); // implies is_not_osr_compilable()
1384 CLEAR_PENDING_EXCEPTION;
1385 return NULL;
1386 }
1387 assert(method->has_native_function(), "must have native code by now");
1388 }
1389
1390 // RedefineClasses() has replaced this method; just return
1391 if (method->is_old()) {
1392 return NULL;
1393 }
1394
1395 // JVMTI -- post_compile_event requires jmethod_id() that may require
1396 // a lock the compiling thread can not acquire. Prefetch it here.
1397 if (JvmtiExport::should_post_compiled_method_load()) {
1398 method->jmethod_id();
1399 }
1400
1401 // do the compilation
1402 if (method->is_native()) {
1403 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1404 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1405 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1406 //
1407 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1408 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1409 AdapterHandlerLibrary::create_native_wrapper(method);
1410 } else {
1411 return NULL;
1412 }
1413 } else {
1414 // If the compiler is shut off due to code cache getting full
1415 // fail out now so blocking compiles dont hang the java thread
1416 if (!should_compile_new_jobs()) {
1417 CompilationPolicy::policy()->delay_compilation(method());
1418 return NULL;
1419 }
1420 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1421 }
1422
1423 // return requested nmethod
1424 // We accept a higher level osr method
1425 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1426 }
1427
1428
1429 // ------------------------------------------------------------------
1430 // CompileBroker::compilation_is_complete
1431 //
1432 // See if compilation of this method is already complete.
1433 bool CompileBroker::compilation_is_complete(methodHandle method,
1434 int osr_bci,
1435 int comp_level) {
1436 bool is_osr = (osr_bci != standard_entry_bci);
1437 if (is_osr) {
1438 if (method->is_not_osr_compilable(comp_level)) {
1439 return true;
1440 } else {
1441 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1442 return (result != NULL);
1443 }
1444 } else {
1445 if (method->is_not_compilable(comp_level)) {
1446 return true;
1447 } else {
1448 nmethod* result = method->code();
1449 if (result == NULL) return false;
1450 return comp_level == result->comp_level();
1451 }
1452 }
1453 }
1454
1455
1456 /**
1457 * See if this compilation is already requested.
1458 *
1459 * Implementation note: there is only a single "is in queue" bit
1460 * for each method. This means that the check below is overly
1461 * conservative in the sense that an osr compilation in the queue
1462 * will block a normal compilation from entering the queue (and vice
1463 * versa). This can be remedied by a full queue search to disambiguate
1464 * cases. If it is deemed profitable, this may be done.
1465 */
1466 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1467 return method->queued_for_compilation();
1468 }
1469
1470 // ------------------------------------------------------------------
1471 // CompileBroker::compilation_is_prohibited
1472 //
1473 // See if this compilation is not allowed.
1474 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1475 bool is_native = method->is_native();
1476 // Some compilers may not support the compilation of natives.
1477 AbstractCompiler *comp = compiler(comp_level);
1478 if (is_native &&
1479 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1480 method->set_not_compilable_quietly(comp_level);
1481 return true;
1482 }
1483
1484 bool is_osr = (osr_bci != standard_entry_bci);
1485 // Some compilers may not support on stack replacement.
1486 if (is_osr &&
1487 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1488 method->set_not_osr_compilable(comp_level);
1489 return true;
1490 }
1491
1492 // The method may be explicitly excluded by the user.
1493 bool quietly;
1494 double scale;
1495 if (CompilerOracle::should_exclude(method, quietly)
1496 || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1497 if (!quietly) {
1498 // This does not happen quietly...
1499 ResourceMark rm;
1500 tty->print("### Excluding %s:%s",
1501 method->is_native() ? "generation of native wrapper" : "compile",
1502 (method->is_static() ? " static" : ""));
1503 method->print_short_name(tty);
1504 tty->cr();
1505 }
1506 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1507 }
1508
1509 return false;
1510 }
1511
1512 /**
1513 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1514 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1515 * The function also allows to generate separate compilation IDs for OSR compilations.
1516 */
1517 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1518 #ifdef ASSERT
1519 bool is_osr = (osr_bci != standard_entry_bci);
1520 int id;
1521 if (method->is_native()) {
1522 assert(!is_osr, "can't be osr");
1523 // Adapters, native wrappers and method handle intrinsics
1524 // should be generated always.
1525 return Atomic::add(1, &_compilation_id);
1526 } else if (CICountOSR && is_osr) {
1527 id = Atomic::add(1, &_osr_compilation_id);
1528 if (CIStartOSR <= id && id < CIStopOSR) {
1529 return id;
1530 }
1531 } else {
1532 id = Atomic::add(1, &_compilation_id);
1533 if (CIStart <= id && id < CIStop) {
1534 return id;
1535 }
1536 }
1537
1538 // Method was not in the appropriate compilation range.
1539 method->set_not_compilable_quietly();
1540 return 0;
1541 #else
1542 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1543 // only _compilation_id is incremented.
1544 return Atomic::add(1, &_compilation_id);
1545 #endif
1546 }
1547
1548 /**
1549 * Should the current thread block until this compilation request
1550 * has been fulfilled?
1551 */
1552 bool CompileBroker::is_compile_blocking() {
1553 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1554 return !BackgroundCompilation;
1555 }
1556
1557
1558 // ------------------------------------------------------------------
1559 // CompileBroker::preload_classes
1560 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1561 // Move this code over from c1_Compiler.cpp
1562 ShouldNotReachHere();
1563 }
1564
1565
1566 // ------------------------------------------------------------------
1567 // CompileBroker::create_compile_task
1568 //
1569 // Create a CompileTask object representing the current request for
1570 // compilation. Add this task to the queue.
1571 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1572 int compile_id,
1573 methodHandle method,
1574 int osr_bci,
1575 int comp_level,
1576 methodHandle hot_method,
1577 int hot_count,
1578 const char* comment,
1579 bool blocking) {
1580 CompileTask* new_task = CompileTask::allocate();
1581 new_task->initialize(compile_id, method, osr_bci, comp_level,
1582 hot_method, hot_count, comment,
1583 blocking);
1584 queue->add(new_task);
1585 return new_task;
1586 }
1587
1588
1589 /**
1590 * Wait for the compilation task to complete.
1591 */
1592 void CompileBroker::wait_for_completion(CompileTask* task) {
1593 if (CIPrintCompileQueue) {
1594 ttyLocker ttyl;
1595 tty->print_cr("BLOCKING FOR COMPILE");
1596 }
1597
1598 assert(task->is_blocking(), "can only wait on blocking task");
1599
1600 JavaThread* thread = JavaThread::current();
1601 thread->set_blocked_on_compilation(true);
1602
1603 methodHandle method(thread, task->method());
1604 {
1605 MutexLocker waiter(task->lock(), thread);
1606
1607 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1608 task->lock()->wait();
1609 }
1610 }
1611
1612 thread->set_blocked_on_compilation(false);
1613 if (is_compilation_disabled_forever()) {
1614 CompileTask::free(task);
1615 return;
1616 }
1617
1618 // It is harmless to check this status without the lock, because
1619 // completion is a stable property (until the task object is recycled).
1620 assert(task->is_complete(), "Compilation should have completed");
1621 assert(task->code_handle() == NULL, "must be reset");
1622
1623 // By convention, the waiter is responsible for recycling a
1624 // blocking CompileTask. Since there is only one waiter ever
1625 // waiting on a CompileTask, we know that no one else will
1626 // be using this CompileTask; we can free it.
1627 CompileTask::free(task);
1628 }
1629
1630 /**
1631 * Initialize compiler thread(s) + compiler object(s). The postcondition
1632 * of this function is that the compiler runtimes are initialized and that
1633 * compiler threads can start compiling.
1634 */
1635 bool CompileBroker::init_compiler_runtime() {
1636 CompilerThread* thread = CompilerThread::current();
1637 AbstractCompiler* comp = thread->compiler();
1638 // Final sanity check - the compiler object must exist
1639 guarantee(comp != NULL, "Compiler object must exist");
1640
1641 int system_dictionary_modification_counter;
1642 {
1643 MutexLocker locker(Compile_lock, thread);
1644 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1645 }
1646
1647 {
1648 // Must switch to native to allocate ci_env
1649 ThreadToNativeFromVM ttn(thread);
1650 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1651 // Cache Jvmti state
1652 ci_env.cache_jvmti_state();
1653 // Cache DTrace flags
1654 ci_env.cache_dtrace_flags();
1655
1656 // Switch back to VM state to do compiler initialization
1657 ThreadInVMfromNative tv(thread);
1658 ResetNoHandleMark rnhm;
1659
1660
1661 if (!comp->is_shark()) {
1662 // Perform per-thread and global initializations
1663 comp->initialize();
1664 }
1665 }
1666
1667 if (comp->is_failed()) {
1668 disable_compilation_forever();
1669 // If compiler initialization failed, no compiler thread that is specific to a
1670 // particular compiler runtime will ever start to compile methods.
1671 shutdown_compiler_runtime(comp, thread);
1672 return false;
1673 }
1674
1675 // C1 specific check
1676 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1677 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1678 return false;
1679 }
1680
1681 return true;
1682 }
1683
1684 /**
1685 * If C1 and/or C2 initialization failed, we shut down all compilation.
1686 * We do this to keep things simple. This can be changed if it ever turns
1687 * out to be a problem.
1688 */
1689 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1690 // Free buffer blob, if allocated
1691 if (thread->get_buffer_blob() != NULL) {
1692 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1693 CodeCache::free(thread->get_buffer_blob());
1694 }
1695
1696 if (comp->should_perform_shutdown()) {
1697 // There are two reasons for shutting down the compiler
1698 // 1) compiler runtime initialization failed
1699 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1700 warning("%s initialization failed. Shutting down all compilers", comp->name());
1701
1702 // Only one thread per compiler runtime object enters here
1703 // Set state to shut down
1704 comp->set_shut_down();
1705
1706 // Delete all queued compilation tasks to make compiler threads exit faster.
1707 if (_c1_compile_queue != NULL) {
1708 _c1_compile_queue->free_all();
1709 }
1710
1711 if (_c2_compile_queue != NULL) {
1712 _c2_compile_queue->free_all();
1713 }
1714
1715 // Set flags so that we continue execution with using interpreter only.
1716 UseCompiler = false;
1717 UseInterpreter = true;
1718
1719 // We could delete compiler runtimes also. However, there are references to
1720 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1721 // fail. This can be done later if necessary.
1722 }
1723 }
1724
1725 // ------------------------------------------------------------------
1726 // CompileBroker::compiler_thread_loop
1727 //
1728 // The main loop run by a CompilerThread.
1729 void CompileBroker::compiler_thread_loop() {
1730 CompilerThread* thread = CompilerThread::current();
1731 CompileQueue* queue = thread->queue();
1732 // For the thread that initializes the ciObjectFactory
1733 // this resource mark holds all the shared objects
1734 ResourceMark rm;
1735
1736 // First thread to get here will initialize the compiler interface
1737
1738 if (!ciObjectFactory::is_initialized()) {
1739 ASSERT_IN_VM;
1740 MutexLocker only_one (CompileThread_lock, thread);
1741 if (!ciObjectFactory::is_initialized()) {
1742 ciObjectFactory::initialize();
1743 }
1744 }
1745
1746 // Open a log.
1747 if (LogCompilation) {
1748 init_compiler_thread_log();
1749 }
1750 CompileLog* log = thread->log();
1751 if (log != NULL) {
1752 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1753 thread->name(),
1754 os::current_thread_id(),
1755 os::current_process_id());
1756 log->stamp();
1757 log->end_elem();
1758 }
1759
1760 // If compiler thread/runtime initialization fails, exit the compiler thread
1761 if (!init_compiler_runtime()) {
1762 return;
1763 }
1764
1765 // Poll for new compilation tasks as long as the JVM runs. Compilation
1766 // should only be disabled if something went wrong while initializing the
1767 // compiler runtimes. This, in turn, should not happen. The only known case
1768 // when compiler runtime initialization fails is if there is not enough free
1769 // space in the code cache to generate the necessary stubs, etc.
1770 while (!is_compilation_disabled_forever()) {
1771 // We need this HandleMark to avoid leaking VM handles.
1772 HandleMark hm(thread);
1773
1774 CompileTask* task = queue->get();
1775 if (task == NULL) {
1776 continue;
1777 }
1778
1779 // Give compiler threads an extra quanta. They tend to be bursty and
1780 // this helps the compiler to finish up the job.
1781 if (CompilerThreadHintNoPreempt) {
1782 os::hint_no_preempt();
1783 }
1784
1785 // trace per thread time and compile statistics
1786 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1787 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1788
1789 // Assign the task to the current thread. Mark this compilation
1790 // thread as active for the profiler.
1791 CompileTaskWrapper ctw(task);
1792 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1793 task->set_code_handle(&result_handle);
1794 methodHandle method(thread, task->method());
1795
1796 // Never compile a method if breakpoints are present in it
1797 if (method()->number_of_breakpoints() == 0) {
1798 // Compile the method.
1799 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1800 invoke_compiler_on_method(task);
1801 } else {
1802 // After compilation is disabled, remove remaining methods from queue
1803 method->clear_queued_for_compilation();
1804 task->set_failure_reason("compilation is disabled");
1805 }
1806 }
1807 }
1808
1809 // Shut down compiler runtime
1810 shutdown_compiler_runtime(thread->compiler(), thread);
1811 }
1812
1813 // ------------------------------------------------------------------
1814 // CompileBroker::init_compiler_thread_log
1815 //
1816 // Set up state required by +LogCompilation.
1817 void CompileBroker::init_compiler_thread_log() {
1818 CompilerThread* thread = CompilerThread::current();
1819 char file_name[4*K];
1820 FILE* fp = NULL;
1821 intx thread_id = os::current_thread_id();
1822 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1823 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1824 if (dir == NULL) {
1825 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1826 thread_id, os::current_process_id());
1827 } else {
1828 jio_snprintf(file_name, sizeof(file_name),
1829 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1830 os::file_separator(), thread_id, os::current_process_id());
1831 }
1832
1833 fp = fopen(file_name, "wt");
1834 if (fp != NULL) {
1835 if (LogCompilation && Verbose) {
1836 tty->print_cr("Opening compilation log %s", file_name);
1837 }
1838 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1839 thread->init_log(log);
1840
1841 if (xtty != NULL) {
1842 ttyLocker ttyl;
1843 // Record any per thread log files
1844 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1845 }
1846 return;
1847 }
1848 }
1849 warning("Cannot open log file: %s", file_name);
1850 }
1851
1852 void CompileBroker::log_metaspace_failure() {
1853 const char* message = "some methods may not be compiled because metaspace "
1854 "is out of memory";
1855 if (_compilation_log != NULL) {
1856 _compilation_log->log_metaspace_failure(message);
1857 }
1858 if (PrintCompilation) {
1859 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1860 }
1861 }
1862
1863
1864 // ------------------------------------------------------------------
1865 // CompileBroker::set_should_block
1866 //
1867 // Set _should_block.
1868 // Call this from the VM, with Threads_lock held and a safepoint requested.
1869 void CompileBroker::set_should_block() {
1870 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1871 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1872 #ifndef PRODUCT
1873 if (PrintCompilation && (Verbose || WizardMode))
1874 tty->print_cr("notifying compiler thread pool to block");
1875 #endif
1876 _should_block = true;
1877 }
1878
1879 // ------------------------------------------------------------------
1880 // CompileBroker::maybe_block
1881 //
1882 // Call this from the compiler at convenient points, to poll for _should_block.
1883 void CompileBroker::maybe_block() {
1884 if (_should_block) {
1885 #ifndef PRODUCT
1886 if (PrintCompilation && (Verbose || WizardMode))
1887 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1888 #endif
1889 ThreadInVMfromNative tivfn(JavaThread::current());
1890 }
1891 }
1892
1893 // wrapper for CodeCache::print_summary()
1894 static void codecache_print(bool detailed)
1895 {
1896 ResourceMark rm;
1897 stringStream s;
1898 // Dump code cache into a buffer before locking the tty,
1899 {
1900 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1901 CodeCache::print_summary(&s, detailed);
1902 }
1903 ttyLocker ttyl;
1904 tty->print("%s", s.as_string());
1905 }
1906
1907 // ------------------------------------------------------------------
1908 // CompileBroker::invoke_compiler_on_method
1909 //
1910 // Compile a method.
1911 //
1912 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1913 if (PrintCompilation) {
1914 ResourceMark rm;
1915 task->print_tty();
1916 }
1917 elapsedTimer time;
1918
1919 CompilerThread* thread = CompilerThread::current();
1920 ResourceMark rm(thread);
1921
1922 if (LogEvents) {
1923 _compilation_log->log_compile(thread, task);
1924 }
1925
1926 // Common flags.
1927 uint compile_id = task->compile_id();
1928 int osr_bci = task->osr_bci();
1929 bool is_osr = (osr_bci != standard_entry_bci);
1930 bool should_log = (thread->log() != NULL);
1931 bool should_break = false;
1932 int task_level = task->comp_level();
1933 {
1934 // create the handle inside it's own block so it can't
1935 // accidentally be referenced once the thread transitions to
1936 // native. The NoHandleMark before the transition should catch
1937 // any cases where this occurs in the future.
1938 methodHandle method(thread, task->method());
1939 should_break = check_break_at(method, compile_id, is_osr);
1940 if (should_log && !CompilerOracle::should_log(method)) {
1941 should_log = false;
1942 }
1943 assert(!method->is_native(), "no longer compile natives");
1944
1945 // Save information about this method in case of failure.
1946 set_last_compile(thread, method, is_osr, task_level);
1947
1948 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1949 }
1950
1951 // Allocate a new set of JNI handles.
1952 push_jni_handle_block();
1953 Method* target_handle = task->method();
1954 int compilable = ciEnv::MethodCompilable;
1955 {
1956 int system_dictionary_modification_counter;
1957 {
1958 MutexLocker locker(Compile_lock, thread);
1959 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1960 }
1961
1962 NoHandleMark nhm;
1963 ThreadToNativeFromVM ttn(thread);
1964
1965 ciEnv ci_env(task, system_dictionary_modification_counter);
1966 if (should_break) {
1967 ci_env.set_break_at_compile(true);
1968 }
1969 if (should_log) {
1970 ci_env.set_log(thread->log());
1971 }
1972 assert(thread->env() == &ci_env, "set by ci_env");
1973 // The thread-env() field is cleared in ~CompileTaskWrapper.
1974
1975 // Cache Jvmti state
1976 ci_env.cache_jvmti_state();
1977
1978 // Cache DTrace flags
1979 ci_env.cache_dtrace_flags();
1980
1981 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1982
1983 TraceTime t1("compilation", &time);
1984 EventCompilation event;
1985
1986 AbstractCompiler *comp = compiler(task_level);
1987 if (comp == NULL) {
1988 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1989 } else {
1990 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1991 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1992 while (WhiteBox::compilation_locked) {
1993 locker.wait(Mutex::_no_safepoint_check_flag);
1994 }
1995 }
1996 comp->compile_method(&ci_env, target, osr_bci);
1997 }
1998
1999 if (!ci_env.failing() && task->code() == NULL) {
2000 //assert(false, "compiler should always document failure");
2001 // The compiler elected, without comment, not to register a result.
2002 // Do not attempt further compilations of this method.
2003 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2004 }
2005
2006 // Copy this bit to the enclosing block:
2007 compilable = ci_env.compilable();
2008
2009 if (ci_env.failing()) {
2010 task->set_failure_reason(ci_env.failure_reason());
2011 ci_env.report_failure(ci_env.failure_reason());
2012 const char* retry_message = ci_env.retry_message();
2013 if (_compilation_log != NULL) {
2014 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2015 }
2016 if (PrintCompilation) {
2017 FormatBufferResource msg = retry_message != NULL ?
2018 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2019 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2020 task->print_compilation(tty, msg);
2021 }
2022 } else {
2023 task->mark_success();
2024 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2025 if (_compilation_log != NULL) {
2026 nmethod* code = task->code();
2027 if (code != NULL) {
2028 _compilation_log->log_nmethod(thread, code);
2029 }
2030 }
2031 }
2032 // simulate crash during compilation
2033 assert(task->compile_id() != CICrashAt, "just as planned");
2034 if (event.should_commit()) {
2035 event.set_method(target->get_Method());
2036 event.set_compileID(compile_id);
2037 event.set_compileLevel(task->comp_level());
2038 event.set_succeded(task->is_success());
2039 event.set_isOsr(is_osr);
2040 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2041 event.set_inlinedBytes(task->num_inlined_bytecodes());
2042 event.commit();
2043 }
2044 }
2045 pop_jni_handle_block();
2046
2047 methodHandle method(thread, task->method());
2048
2049 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2050
2051 collect_statistics(thread, time, task);
2052
2053 if (PrintCompilation && PrintCompilation2) {
2054 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2055 tty->print("%4d ", compile_id); // print compilation number
2056 tty->print("%s ", (is_osr ? "%" : " "));
2057 if (task->code() != NULL) {
2058 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2059 }
2060 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2061 }
2062
2063 if (PrintCodeCacheOnCompilation)
2064 codecache_print(/* detailed= */ false);
2065
2066 // Disable compilation, if required.
2067 switch (compilable) {
2068 case ciEnv::MethodCompilable_never:
2069 if (is_osr)
2070 method->set_not_osr_compilable_quietly();
2071 else
2072 method->set_not_compilable_quietly();
2073 break;
2074 case ciEnv::MethodCompilable_not_at_tier:
2075 if (is_osr)
2076 method->set_not_osr_compilable_quietly(task_level);
2077 else
2078 method->set_not_compilable_quietly(task_level);
2079 break;
2080 }
2081
2082 // Note that the queued_for_compilation bits are cleared without
2083 // protection of a mutex. [They were set by the requester thread,
2084 // when adding the task to the compile queue -- at which time the
2085 // compile queue lock was held. Subsequently, we acquired the compile
2086 // queue lock to get this task off the compile queue; thus (to belabour
2087 // the point somewhat) our clearing of the bits must be occurring
2088 // only after the setting of the bits. See also 14012000 above.
2089 method->clear_queued_for_compilation();
2090
2091 #ifdef ASSERT
2092 if (CollectedHeap::fired_fake_oom()) {
2093 // The current compile received a fake OOM during compilation so
2094 // go ahead and exit the VM since the test apparently succeeded
2095 tty->print_cr("*** Shutting down VM after successful fake OOM");
2096 vm_exit(0);
2097 }
2098 #endif
2099 }
2100
2101 /**
2102 * The CodeCache is full. Print warning and disable compilation.
2103 * Schedule code cache cleaning so compilation can continue later.
2104 * This function needs to be called only from CodeCache::allocate(),
2105 * since we currently handle a full code cache uniformly.
2106 */
2107 void CompileBroker::handle_full_code_cache(int code_blob_type) {
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 }
2123
2124 #ifndef PRODUCT
2125 if (CompileTheWorld || ExitOnFullCodeCache) {
2126 codecache_print(/* detailed= */ true);
2127 before_exit(JavaThread::current());
2128 exit_globals(); // will delete tty
2129 vm_direct_exit(CompileTheWorld ? 0 : 1);
2130 }
2131 #endif
2132 if (UseCodeCacheFlushing) {
2133 // Since code cache is full, immediately stop new compiles
2134 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2135 NMethodSweeper::log_sweep("disable_compiler");
2136 }
2137 } else {
2138 disable_compilation_forever();
2139 }
2140
2141 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2142 }
2143 }
2144
2145 // ------------------------------------------------------------------
2146 // CompileBroker::set_last_compile
2147 //
2148 // Record this compilation for debugging purposes.
2149 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2150 ResourceMark rm;
2151 char* method_name = method->name()->as_C_string();
2152 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2153 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2154 char current_method[CompilerCounters::cmname_buffer_length];
2155 size_t maxLen = CompilerCounters::cmname_buffer_length;
2156
2157 if (UsePerfData) {
2158 const char* class_name = method->method_holder()->name()->as_C_string();
2159
2160 size_t s1len = strlen(class_name);
2161 size_t s2len = strlen(method_name);
2162
2163 // check if we need to truncate the string
2164 if (s1len + s2len + 2 > maxLen) {
2165
2166 // the strategy is to lop off the leading characters of the
2167 // class name and the trailing characters of the method name.
2168
2169 if (s2len + 2 > maxLen) {
2170 // lop of the entire class name string, let snprintf handle
2171 // truncation of the method name.
2172 class_name += s1len; // null string
2173 }
2174 else {
2175 // lop off the extra characters from the front of the class name
2176 class_name += ((s1len + s2len + 2) - maxLen);
2177 }
2178 }
2179
2180 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2181 }
2182
2183 if (CICountOSR && is_osr) {
2184 _last_compile_type = osr_compile;
2185 } else {
2186 _last_compile_type = normal_compile;
2187 }
2188 _last_compile_level = comp_level;
2189
2190 if (UsePerfData) {
2191 CompilerCounters* counters = thread->counters();
2192 counters->set_current_method(current_method);
2193 counters->set_compile_type((jlong)_last_compile_type);
2194 }
2195 }
2196
2197
2198 // ------------------------------------------------------------------
2199 // CompileBroker::push_jni_handle_block
2200 //
2201 // Push on a new block of JNI handles.
2202 void CompileBroker::push_jni_handle_block() {
2203 JavaThread* thread = JavaThread::current();
2204
2205 // Allocate a new block for JNI handles.
2206 // Inlined code from jni_PushLocalFrame()
2207 JNIHandleBlock* java_handles = thread->active_handles();
2208 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2209 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2210 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2211 thread->set_active_handles(compile_handles);
2212 }
2213
2214
2215 // ------------------------------------------------------------------
2216 // CompileBroker::pop_jni_handle_block
2217 //
2218 // Pop off the current block of JNI handles.
2219 void CompileBroker::pop_jni_handle_block() {
2220 JavaThread* thread = JavaThread::current();
2221
2222 // Release our JNI handle block
2223 JNIHandleBlock* compile_handles = thread->active_handles();
2224 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2225 thread->set_active_handles(java_handles);
2226 compile_handles->set_pop_frame_link(NULL);
2227 JNIHandleBlock::release_block(compile_handles, thread); // may block
2228 }
2229
2230
2231 // ------------------------------------------------------------------
2232 // CompileBroker::check_break_at
2233 //
2234 // Should the compilation break at the current compilation.
2235 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2236 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2237 return true;
2238 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2239 return true;
2240 } else {
2241 return (compile_id == CIBreakAt);
2242 }
2243 }
2244
2245 // ------------------------------------------------------------------
2246 // CompileBroker::collect_statistics
2247 //
2248 // Collect statistics about the compilation.
2249
2250 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2251 bool success = task->is_success();
2252 methodHandle method (thread, task->method());
2253 uint compile_id = task->compile_id();
2254 bool is_osr = (task->osr_bci() != standard_entry_bci);
2255 nmethod* code = task->code();
2256 CompilerCounters* counters = thread->counters();
2257
2258 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2259 MutexLocker locker(CompileStatistics_lock);
2260
2261 // _perf variables are production performance counters which are
2262 // updated regardless of the setting of the CITime and CITimeEach flags
2263 //
2264
2265 // account all time, including bailouts and failures in this counter;
2266 // C1 and C2 counters are counting both successful and unsuccessful compiles
2267 _t_total_compilation.add(time);
2268
2269 if (!success) {
2270 _total_bailout_count++;
2271 if (UsePerfData) {
2272 _perf_last_failed_method->set_value(counters->current_method());
2273 _perf_last_failed_type->set_value(counters->compile_type());
2274 _perf_total_bailout_count->inc();
2275 }
2276 _t_bailedout_compilation.add(time);
2277 } else if (code == NULL) {
2278 if (UsePerfData) {
2279 _perf_last_invalidated_method->set_value(counters->current_method());
2280 _perf_last_invalidated_type->set_value(counters->compile_type());
2281 _perf_total_invalidated_count->inc();
2282 }
2283 _total_invalidated_count++;
2284 _t_invalidated_compilation.add(time);
2285 } else {
2286 // Compilation succeeded
2287
2288 // update compilation ticks - used by the implementation of
2289 // java.lang.management.CompilationMBean
2290 _perf_total_compilation->inc(time.ticks());
2291 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2292
2293 if (CITime) {
2294 if (is_osr) {
2295 _t_osr_compilation.add(time);
2296 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2297 } else {
2298 _t_standard_compilation.add(time);
2299 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2300 }
2301 }
2302
2303 if (UsePerfData) {
2304 // save the name of the last method compiled
2305 _perf_last_method->set_value(counters->current_method());
2306 _perf_last_compile_type->set_value(counters->compile_type());
2307 _perf_last_compile_size->set_value(method->code_size() +
2308 task->num_inlined_bytecodes());
2309 if (is_osr) {
2310 _perf_osr_compilation->inc(time.ticks());
2311 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2312 } else {
2313 _perf_standard_compilation->inc(time.ticks());
2314 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2315 }
2316 }
2317
2318 if (CITimeEach) {
2319 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2320 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2321 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2322 }
2323
2324 // Collect counts of successful compilations
2325 _sum_nmethod_size += code->total_size();
2326 _sum_nmethod_code_size += code->insts_size();
2327 _total_compile_count++;
2328
2329 if (UsePerfData) {
2330 _perf_sum_nmethod_size->inc( code->total_size());
2331 _perf_sum_nmethod_code_size->inc(code->insts_size());
2332 _perf_total_compile_count->inc();
2333 }
2334
2335 if (is_osr) {
2336 if (UsePerfData) _perf_total_osr_compile_count->inc();
2337 _total_osr_compile_count++;
2338 } else {
2339 if (UsePerfData) _perf_total_standard_compile_count->inc();
2340 _total_standard_compile_count++;
2341 }
2342 }
2343 // set the current method for the thread to null
2344 if (UsePerfData) counters->set_current_method("");
2345 }
2346
2347 const char* CompileBroker::compiler_name(int comp_level) {
2348 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2349 if (comp == NULL) {
2350 return "no compiler";
2351 } else {
2352 return (comp->name());
2353 }
2354 }
2355
2356 void CompileBroker::print_times() {
2357 tty->cr();
2358 tty->print_cr("Accumulated compiler times");
2359 tty->print_cr("----------------------------------------------------------");
2360 //0000000000111111111122222222223333333333444444444455555555556666666666
2361 //0123456789012345678901234567890123456789012345678901234567890123456789
2362 tty->print_cr(" Total compilation time : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2363 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2364 CompileBroker::_t_standard_compilation.seconds(),
2365 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2366 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2367 CompileBroker::_t_bailedout_compilation.seconds(),
2368 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2369 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2370 CompileBroker::_t_osr_compilation.seconds(),
2371 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2372 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2373 CompileBroker::_t_invalidated_compilation.seconds(),
2374 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2375
2376 AbstractCompiler *comp = compiler(CompLevel_simple);
2377 if (comp != NULL) {
2378 tty->cr();
2379 comp->print_timers();
2380 }
2381 comp = compiler(CompLevel_full_optimization);
2382 if (comp != NULL) {
2383 tty->cr();
2384 comp->print_timers();
2385 }
2386 tty->cr();
2387 tty->print_cr(" Total compiled methods : %8d methods", CompileBroker::_total_compile_count);
2388 tty->print_cr(" Standard compilation : %8d methods", CompileBroker::_total_standard_compile_count);
2389 tty->print_cr(" On stack replacement : %8d methods", CompileBroker::_total_osr_compile_count);
2390 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2391 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2392 tty->print_cr(" Standard compilation : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2393 tty->print_cr(" On stack replacement : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2394 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2395 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2396 tty->cr();
2397 tty->print_cr(" nmethod code size : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2398 tty->print_cr(" nmethod total size : %8d bytes", CompileBroker::_sum_nmethod_size);
2399 }
2400
2401 // Debugging output for failure
2402 void CompileBroker::print_last_compile() {
2403 if ( _last_compile_level != CompLevel_none &&
2404 compiler(_last_compile_level) != NULL &&
2405 _last_method_compiled != NULL &&
2406 _last_compile_type != no_compile) {
2407 if (_last_compile_type == osr_compile) {
2408 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2409 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2410 } else {
2411 tty->print_cr("Last parse: %d+++(%d) %s",
2412 _compilation_id, _last_compile_level, _last_method_compiled);
2413 }
2414 }
2415 }
2416
2417
2418 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2419 #ifndef PRODUCT
2420 st->print_cr("Compiler thread printing unimplemented.");
2421 st->cr();
2422 #endif
2423 }