Tue, 29 Apr 2014 07:59:22 +0200
8040798: compiler/startup/SmallCodeCacheStartup.java timed out in RT_Baseline
Summary: Fixes broken memory freeing of compile queue tasks and makes sure that blocking compiles do not hang the VM if compilation gets disabled due to a full code cache.
Reviewed-by: kvn, iveresov
1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "code/codeCache.hpp"
29 #include "compiler/compileBroker.hpp"
30 #include "compiler/compileLog.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "interpreter/linkResolver.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "oops/methodData.hpp"
35 #include "oops/method.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/nativeLookup.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/compilationPolicy.hpp"
40 #include "runtime/init.hpp"
41 #include "runtime/interfaceSupport.hpp"
42 #include "runtime/javaCalls.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/sharedRuntime.hpp"
45 #include "runtime/sweeper.hpp"
46 #include "trace/tracing.hpp"
47 #include "utilities/dtrace.hpp"
48 #include "utilities/events.hpp"
49 #ifdef COMPILER1
50 #include "c1/c1_Compiler.hpp"
51 #endif
52 #ifdef COMPILER2
53 #include "opto/c2compiler.hpp"
54 #endif
55 #ifdef SHARK
56 #include "shark/sharkCompiler.hpp"
57 #endif
59 #ifdef DTRACE_ENABLED
61 // Only bother with this argument setup if dtrace is available
63 #ifndef USDT2
64 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
65 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
66 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
67 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
69 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
70 { \
71 Symbol* klass_name = (method)->klass_name(); \
72 Symbol* name = (method)->name(); \
73 Symbol* signature = (method)->signature(); \
74 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \
75 comp_name, strlen(comp_name), \
76 klass_name->bytes(), klass_name->utf8_length(), \
77 name->bytes(), name->utf8_length(), \
78 signature->bytes(), signature->utf8_length()); \
79 }
81 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
82 { \
83 Symbol* klass_name = (method)->klass_name(); \
84 Symbol* name = (method)->name(); \
85 Symbol* signature = (method)->signature(); \
86 HS_DTRACE_PROBE9(hotspot, method__compile__end, \
87 comp_name, strlen(comp_name), \
88 klass_name->bytes(), klass_name->utf8_length(), \
89 name->bytes(), name->utf8_length(), \
90 signature->bytes(), signature->utf8_length(), (success)); \
91 }
93 #else /* USDT2 */
95 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
96 { \
97 Symbol* klass_name = (method)->klass_name(); \
98 Symbol* name = (method)->name(); \
99 Symbol* signature = (method)->signature(); \
100 HOTSPOT_METHOD_COMPILE_BEGIN( \
101 comp_name, strlen(comp_name), \
102 (char *) klass_name->bytes(), klass_name->utf8_length(), \
103 (char *) name->bytes(), name->utf8_length(), \
104 (char *) signature->bytes(), signature->utf8_length()); \
105 }
107 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
108 { \
109 Symbol* klass_name = (method)->klass_name(); \
110 Symbol* name = (method)->name(); \
111 Symbol* signature = (method)->signature(); \
112 HOTSPOT_METHOD_COMPILE_END( \
113 comp_name, strlen(comp_name), \
114 (char *) klass_name->bytes(), klass_name->utf8_length(), \
115 (char *) name->bytes(), name->utf8_length(), \
116 (char *) signature->bytes(), signature->utf8_length(), (success)); \
117 }
118 #endif /* USDT2 */
120 #else // ndef DTRACE_ENABLED
122 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
123 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
125 #endif // ndef DTRACE_ENABLED
127 bool CompileBroker::_initialized = false;
128 volatile bool CompileBroker::_should_block = false;
129 volatile jint CompileBroker::_print_compilation_warning = 0;
130 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
132 // The installed compiler(s)
133 AbstractCompiler* CompileBroker::_compilers[2];
135 // These counters are used to assign an unique ID to each compilation.
136 volatile jint CompileBroker::_compilation_id = 0;
137 volatile jint CompileBroker::_osr_compilation_id = 0;
139 // Debugging information
140 int CompileBroker::_last_compile_type = no_compile;
141 int CompileBroker::_last_compile_level = CompLevel_none;
142 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
144 // Performance counters
145 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
149 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
150 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
155 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
156 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
160 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
161 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
163 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
165 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
166 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
168 // Timers and counters for generating statistics
169 elapsedTimer CompileBroker::_t_total_compilation;
170 elapsedTimer CompileBroker::_t_osr_compilation;
171 elapsedTimer CompileBroker::_t_standard_compilation;
173 int CompileBroker::_total_bailout_count = 0;
174 int CompileBroker::_total_invalidated_count = 0;
175 int CompileBroker::_total_compile_count = 0;
176 int CompileBroker::_total_osr_compile_count = 0;
177 int CompileBroker::_total_standard_compile_count = 0;
179 int CompileBroker::_sum_osr_bytes_compiled = 0;
180 int CompileBroker::_sum_standard_bytes_compiled = 0;
181 int CompileBroker::_sum_nmethod_size = 0;
182 int CompileBroker::_sum_nmethod_code_size = 0;
184 long CompileBroker::_peak_compilation_time = 0;
186 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
187 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
189 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
192 class CompilationLog : public StringEventLog {
193 public:
194 CompilationLog() : StringEventLog("Compilation events") {
195 }
197 void log_compile(JavaThread* thread, CompileTask* task) {
198 StringLogMessage lm;
199 stringStream sstr = lm.stream();
200 // msg.time_stamp().update_to(tty->time_stamp().ticks());
201 task->print_compilation(&sstr, NULL, true);
202 log(thread, "%s", (const char*)lm);
203 }
205 void log_nmethod(JavaThread* thread, nmethod* nm) {
206 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
207 nm->compile_id(), nm->is_osr_method() ? "%" : "",
208 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
209 }
211 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
212 StringLogMessage lm;
213 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
214 if (retry_message != NULL) {
215 lm.append(" (%s)", retry_message);
216 }
217 lm.print("\n");
218 log(thread, "%s", (const char*)lm);
219 }
220 };
222 static CompilationLog* _compilation_log = NULL;
224 void compileBroker_init() {
225 if (LogEvents) {
226 _compilation_log = new CompilationLog();
227 }
228 }
230 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
231 CompilerThread* thread = CompilerThread::current();
232 thread->set_task(task);
233 CompileLog* log = thread->log();
234 if (log != NULL) task->log_task_start(log);
235 }
237 CompileTaskWrapper::~CompileTaskWrapper() {
238 CompilerThread* thread = CompilerThread::current();
239 CompileTask* task = thread->task();
240 CompileLog* log = thread->log();
241 if (log != NULL) task->log_task_done(log);
242 thread->set_task(NULL);
243 task->set_code_handle(NULL);
244 thread->set_env(NULL);
245 if (task->is_blocking()) {
246 MutexLocker notifier(task->lock(), thread);
247 task->mark_complete();
248 // Notify the waiting thread that the compilation has completed.
249 task->lock()->notify_all();
250 } else {
251 task->mark_complete();
253 // By convention, the compiling thread is responsible for
254 // recycling a non-blocking CompileTask.
255 CompileTask::free(task);
256 }
257 }
260 CompileTask* CompileTask::_task_free_list = NULL;
261 #ifdef ASSERT
262 int CompileTask::_num_allocated_tasks = 0;
263 #endif
264 /**
265 * Allocate a CompileTask, from the free list if possible.
266 */
267 CompileTask* CompileTask::allocate() {
268 MutexLocker locker(CompileTaskAlloc_lock);
269 CompileTask* task = NULL;
271 if (_task_free_list != NULL) {
272 task = _task_free_list;
273 _task_free_list = task->next();
274 task->set_next(NULL);
275 } else {
276 task = new CompileTask();
277 DEBUG_ONLY(_num_allocated_tasks++;)
278 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
279 task->set_next(NULL);
280 task->set_is_free(true);
281 }
282 assert(task->is_free(), "Task must be free.");
283 task->set_is_free(false);
284 return task;
285 }
288 /**
289 * Add a task to the free list.
290 */
291 void CompileTask::free(CompileTask* task) {
292 MutexLocker locker(CompileTaskAlloc_lock);
293 if (!task->is_free()) {
294 task->set_code(NULL);
295 assert(!task->lock()->is_locked(), "Should not be locked when freed");
296 JNIHandles::destroy_global(task->_method_holder);
297 JNIHandles::destroy_global(task->_hot_method_holder);
299 task->set_is_free(true);
300 task->set_next(_task_free_list);
301 _task_free_list = task;
302 }
303 }
305 void CompileTask::initialize(int compile_id,
306 methodHandle method,
307 int osr_bci,
308 int comp_level,
309 methodHandle hot_method,
310 int hot_count,
311 const char* comment,
312 bool is_blocking) {
313 assert(!_lock->is_locked(), "bad locking");
315 _compile_id = compile_id;
316 _method = method();
317 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
318 _osr_bci = osr_bci;
319 _is_blocking = is_blocking;
320 _comp_level = comp_level;
321 _num_inlined_bytecodes = 0;
323 _is_complete = false;
324 _is_success = false;
325 _code_handle = NULL;
327 _hot_method = NULL;
328 _hot_method_holder = NULL;
329 _hot_count = hot_count;
330 _time_queued = 0; // tidy
331 _comment = comment;
332 _failure_reason = NULL;
334 if (LogCompilation) {
335 _time_queued = os::elapsed_counter();
336 if (hot_method.not_null()) {
337 if (hot_method == method) {
338 _hot_method = _method;
339 } else {
340 _hot_method = hot_method();
341 // only add loader or mirror if different from _method_holder
342 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
343 }
344 }
345 }
347 _next = NULL;
348 }
350 // ------------------------------------------------------------------
351 // CompileTask::code/set_code
352 nmethod* CompileTask::code() const {
353 if (_code_handle == NULL) return NULL;
354 return _code_handle->code();
355 }
356 void CompileTask::set_code(nmethod* nm) {
357 if (_code_handle == NULL && nm == NULL) return;
358 guarantee(_code_handle != NULL, "");
359 _code_handle->set_code(nm);
360 if (nm == NULL) _code_handle = NULL; // drop the handle also
361 }
364 void CompileTask::mark_on_stack() {
365 // Mark these methods as something redefine classes cannot remove.
366 _method->set_on_stack(true);
367 if (_hot_method != NULL) {
368 _hot_method->set_on_stack(true);
369 }
370 }
372 // ------------------------------------------------------------------
373 // CompileTask::print
374 void CompileTask::print() {
375 tty->print("<CompileTask compile_id=%d ", _compile_id);
376 tty->print("method=");
377 _method->print_name(tty);
378 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
379 _osr_bci, bool_to_str(_is_blocking),
380 bool_to_str(_is_complete), bool_to_str(_is_success));
381 }
384 // ------------------------------------------------------------------
385 // CompileTask::print_line_on_error
386 //
387 // This function is called by fatal error handler when the thread
388 // causing troubles is a compiler thread.
389 //
390 // Do not grab any lock, do not allocate memory.
391 //
392 // Otherwise it's the same as CompileTask::print_line()
393 //
394 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
395 // print compiler name
396 st->print("%s:", CompileBroker::compiler_name(comp_level()));
397 print_compilation(st);
398 }
400 // ------------------------------------------------------------------
401 // CompileTask::print_line
402 void CompileTask::print_line() {
403 ttyLocker ttyl; // keep the following output all in one block
404 // print compiler name if requested
405 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
406 print_compilation();
407 }
410 // ------------------------------------------------------------------
411 // CompileTask::print_compilation_impl
412 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
413 bool is_osr_method, int osr_bci, bool is_blocking,
414 const char* msg, bool short_form) {
415 if (!short_form) {
416 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp
417 }
418 st->print("%4d ", compile_id); // print compilation number
420 // For unloaded methods the transition to zombie occurs after the
421 // method is cleared so it's impossible to report accurate
422 // information for that case.
423 bool is_synchronized = false;
424 bool has_exception_handler = false;
425 bool is_native = false;
426 if (method != NULL) {
427 is_synchronized = method->is_synchronized();
428 has_exception_handler = method->has_exception_handler();
429 is_native = method->is_native();
430 }
431 // method attributes
432 const char compile_type = is_osr_method ? '%' : ' ';
433 const char sync_char = is_synchronized ? 's' : ' ';
434 const char exception_char = has_exception_handler ? '!' : ' ';
435 const char blocking_char = is_blocking ? 'b' : ' ';
436 const char native_char = is_native ? 'n' : ' ';
438 // print method attributes
439 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
441 if (TieredCompilation) {
442 if (comp_level != -1) st->print("%d ", comp_level);
443 else st->print("- ");
444 }
445 st->print(" "); // more indent
447 if (method == NULL) {
448 st->print("(method)");
449 } else {
450 method->print_short_name(st);
451 if (is_osr_method) {
452 st->print(" @ %d", osr_bci);
453 }
454 if (method->is_native())
455 st->print(" (native)");
456 else
457 st->print(" (%d bytes)", method->code_size());
458 }
460 if (msg != NULL) {
461 st->print(" %s", msg);
462 }
463 if (!short_form) {
464 st->cr();
465 }
466 }
468 // ------------------------------------------------------------------
469 // CompileTask::print_inlining
470 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
471 // 1234567
472 st->print(" "); // print timestamp
473 // 1234
474 st->print(" "); // print compilation number
476 // method attributes
477 if (method->is_loaded()) {
478 const char sync_char = method->is_synchronized() ? 's' : ' ';
479 const char exception_char = method->has_exception_handlers() ? '!' : ' ';
480 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' ';
482 // print method attributes
483 st->print(" %c%c%c ", sync_char, exception_char, monitors_char);
484 } else {
485 // %s!bn
486 st->print(" "); // print method attributes
487 }
489 if (TieredCompilation) {
490 st->print(" ");
491 }
492 st->print(" "); // more indent
493 st->print(" "); // initial inlining indent
495 for (int i = 0; i < inline_level; i++) st->print(" ");
497 st->print("@ %d ", bci); // print bci
498 method->print_short_name(st);
499 if (method->is_loaded())
500 st->print(" (%d bytes)", method->code_size());
501 else
502 st->print(" (not loaded)");
504 if (msg != NULL) {
505 st->print(" %s", msg);
506 }
507 st->cr();
508 }
510 // ------------------------------------------------------------------
511 // CompileTask::print_inline_indent
512 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
513 // 1234567
514 st->print(" "); // print timestamp
515 // 1234
516 st->print(" "); // print compilation number
517 // %s!bn
518 st->print(" "); // print method attributes
519 if (TieredCompilation) {
520 st->print(" ");
521 }
522 st->print(" "); // more indent
523 st->print(" "); // initial inlining indent
524 for (int i = 0; i < inline_level; i++) st->print(" ");
525 }
527 // ------------------------------------------------------------------
528 // CompileTask::print_compilation
529 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
530 bool is_osr_method = osr_bci() != InvocationEntryBci;
531 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
532 }
534 // ------------------------------------------------------------------
535 // CompileTask::log_task
536 void CompileTask::log_task(xmlStream* log) {
537 Thread* thread = Thread::current();
538 methodHandle method(thread, this->method());
539 ResourceMark rm(thread);
541 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
542 log->print(" compile_id='%d'", _compile_id);
543 if (_osr_bci != CompileBroker::standard_entry_bci) {
544 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind
545 } // else compile_kind='c2c'
546 if (!method.is_null()) log->method(method);
547 if (_osr_bci != CompileBroker::standard_entry_bci) {
548 log->print(" osr_bci='%d'", _osr_bci);
549 }
550 if (_comp_level != CompLevel_highest_tier) {
551 log->print(" level='%d'", _comp_level);
552 }
553 if (_is_blocking) {
554 log->print(" blocking='1'");
555 }
556 log->stamp();
557 }
560 // ------------------------------------------------------------------
561 // CompileTask::log_task_queued
562 void CompileTask::log_task_queued() {
563 Thread* thread = Thread::current();
564 ttyLocker ttyl;
565 ResourceMark rm(thread);
567 xtty->begin_elem("task_queued");
568 log_task(xtty);
569 if (_comment != NULL) {
570 xtty->print(" comment='%s'", _comment);
571 }
572 if (_hot_method != NULL) {
573 methodHandle hot(thread, _hot_method);
574 methodHandle method(thread, _method);
575 if (hot() != method()) {
576 xtty->method(hot);
577 }
578 }
579 if (_hot_count != 0) {
580 xtty->print(" hot_count='%d'", _hot_count);
581 }
582 xtty->end_elem();
583 }
586 // ------------------------------------------------------------------
587 // CompileTask::log_task_start
588 void CompileTask::log_task_start(CompileLog* log) {
589 log->begin_head("task");
590 log_task(log);
591 log->end_head();
592 }
595 // ------------------------------------------------------------------
596 // CompileTask::log_task_done
597 void CompileTask::log_task_done(CompileLog* log) {
598 Thread* thread = Thread::current();
599 methodHandle method(thread, this->method());
600 ResourceMark rm(thread);
602 if (!_is_success) {
603 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
604 log->elem("failure reason='%s'", reason);
605 }
607 // <task_done ... stamp='1.234'> </task>
608 nmethod* nm = code();
609 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
610 _is_success, nm == NULL ? 0 : nm->content_size(),
611 method->invocation_count());
612 int bec = method->backedge_count();
613 if (bec != 0) log->print(" backedge_count='%d'", bec);
614 // Note: "_is_complete" is about to be set, but is not.
615 if (_num_inlined_bytecodes != 0) {
616 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
617 }
618 log->stamp();
619 log->end_elem();
620 log->tail("task");
621 log->clear_identities(); // next task will have different CI
622 if (log->unflushed_count() > 2000) {
623 log->flush();
624 }
625 log->mark_file_end();
626 }
630 /**
631 * Add a CompileTask to a CompileQueue
632 */
633 void CompileQueue::add(CompileTask* task) {
634 assert(lock()->owned_by_self(), "must own lock");
635 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
637 task->set_next(NULL);
638 task->set_prev(NULL);
640 if (_last == NULL) {
641 // The compile queue is empty.
642 assert(_first == NULL, "queue is empty");
643 _first = task;
644 _last = task;
645 } else {
646 // Append the task to the queue.
647 assert(_last->next() == NULL, "not last");
648 _last->set_next(task);
649 task->set_prev(_last);
650 _last = task;
651 }
652 ++_size;
654 // Mark the method as being in the compile queue.
655 task->method()->set_queued_for_compilation();
657 NOT_PRODUCT(print();)
659 if (LogCompilation && xtty != NULL) {
660 task->log_task_queued();
661 }
663 // Notify CompilerThreads that a task is available.
664 lock()->notify_all();
665 }
667 void CompileQueue::free_all() {
668 MutexLocker mu(lock());
669 if (_first != NULL) {
670 for (CompileTask* task = _first; task != NULL; task = task->next()) {
671 // Wake up thread that blocks on the compile task.
672 task->lock()->notify();
673 // Puts task back on the freelist.
674 CompileTask::free(task);
675 }
676 _first = NULL;
677 }
678 // Wake up all threads that block on the queue.
679 lock()->notify_all();
680 }
682 // ------------------------------------------------------------------
683 // CompileQueue::get
684 //
685 // Get the next CompileTask from a CompileQueue
686 CompileTask* CompileQueue::get() {
687 NMethodSweeper::possibly_sweep();
689 MutexLocker locker(lock());
690 // If _first is NULL we have no more compile jobs. There are two reasons for
691 // having no compile jobs: First, we compiled everything we wanted. Second,
692 // we ran out of code cache so compilation has been disabled. In the latter
693 // case we perform code cache sweeps to free memory such that we can re-enable
694 // compilation.
695 while (_first == NULL) {
696 // Exit loop if compilation is disabled forever
697 if (CompileBroker::is_compilation_disabled_forever()) {
698 return NULL;
699 }
701 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
702 // Wait a certain amount of time to possibly do another sweep.
703 // We must wait until stack scanning has happened so that we can
704 // transition a method's state from 'not_entrant' to 'zombie'.
705 long wait_time = NmethodSweepCheckInterval * 1000;
706 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
707 // Only one thread at a time can do sweeping. Scale the
708 // wait time according to the number of compiler threads.
709 // As a result, the next sweep is likely to happen every 100ms
710 // with an arbitrary number of threads that do sweeping.
711 wait_time = 100 * CICompilerCount;
712 }
713 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
714 if (timeout) {
715 MutexUnlocker ul(lock());
716 NMethodSweeper::possibly_sweep();
717 }
718 } else {
719 // If there are no compilation tasks and we can compile new jobs
720 // (i.e., there is enough free space in the code cache) there is
721 // no need to invoke the sweeper. As a result, the hotness of methods
722 // remains unchanged. This behavior is desired, since we want to keep
723 // the stable state, i.e., we do not want to evict methods from the
724 // code cache if it is unnecessary.
725 // We need a timed wait here, since compiler threads can exit if compilation
726 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
727 // is not critical and we do not want idle compiler threads to wake up too often.
728 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
729 }
730 }
732 if (CompileBroker::is_compilation_disabled_forever()) {
733 return NULL;
734 }
736 CompileTask* task;
737 {
738 No_Safepoint_Verifier nsv;
739 task = CompilationPolicy::policy()->select_task(this);
740 }
741 remove(task);
742 purge_stale_tasks(); // may temporarily release MCQ lock
743 return task;
744 }
746 // Clean & deallocate stale compile tasks.
747 // Temporarily releases MethodCompileQueue lock.
748 void CompileQueue::purge_stale_tasks() {
749 assert(lock()->owned_by_self(), "must own lock");
750 if (_first_stale != NULL) {
751 // Stale tasks are purged when MCQ lock is released,
752 // but _first_stale updates are protected by MCQ lock.
753 // Once task processing starts and MCQ lock is released,
754 // other compiler threads can reuse _first_stale.
755 CompileTask* head = _first_stale;
756 _first_stale = NULL;
757 {
758 MutexUnlocker ul(lock());
759 for (CompileTask* task = head; task != NULL; ) {
760 CompileTask* next_task = task->next();
761 CompileTaskWrapper ctw(task); // Frees the task
762 task->set_failure_reason("stale task");
763 task = next_task;
764 }
765 }
766 }
767 }
769 void CompileQueue::remove(CompileTask* task) {
770 assert(lock()->owned_by_self(), "must own lock");
771 if (task->prev() != NULL) {
772 task->prev()->set_next(task->next());
773 } else {
774 // max is the first element
775 assert(task == _first, "Sanity");
776 _first = task->next();
777 }
779 if (task->next() != NULL) {
780 task->next()->set_prev(task->prev());
781 } else {
782 // max is the last element
783 assert(task == _last, "Sanity");
784 _last = task->prev();
785 }
786 --_size;
787 }
789 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
790 assert(lock()->owned_by_self(), "must own lock");
791 remove(task);
793 // Enqueue the task for reclamation (should be done outside MCQ lock)
794 task->set_next(_first_stale);
795 task->set_prev(NULL);
796 _first_stale = task;
797 }
799 // methods in the compile queue need to be marked as used on the stack
800 // so that they don't get reclaimed by Redefine Classes
801 void CompileQueue::mark_on_stack() {
802 CompileTask* task = _first;
803 while (task != NULL) {
804 task->mark_on_stack();
805 task = task->next();
806 }
807 }
809 #ifndef PRODUCT
810 /**
811 * Print entire compilation queue.
812 */
813 void CompileQueue::print() {
814 if (CIPrintCompileQueue) {
815 ttyLocker ttyl;
816 tty->print_cr("Contents of %s", name());
817 tty->print_cr("----------------------");
818 CompileTask* task = _first;
819 while (task != NULL) {
820 task->print_line();
821 task = task->next();
822 }
823 tty->print_cr("----------------------");
824 }
825 }
826 #endif // PRODUCT
828 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
830 _current_method[0] = '\0';
831 _compile_type = CompileBroker::no_compile;
833 if (UsePerfData) {
834 ResourceMark rm;
836 // create the thread instance name space string - don't create an
837 // instance subspace if instance is -1 - keeps the adapterThread
838 // counters from having a ".0" namespace.
839 const char* thread_i = (instance == -1) ? thread_name :
840 PerfDataManager::name_space(thread_name, instance);
843 char* name = PerfDataManager::counter_name(thread_i, "method");
844 _perf_current_method =
845 PerfDataManager::create_string_variable(SUN_CI, name,
846 cmname_buffer_length,
847 _current_method, CHECK);
849 name = PerfDataManager::counter_name(thread_i, "type");
850 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
851 PerfData::U_None,
852 (jlong)_compile_type,
853 CHECK);
855 name = PerfDataManager::counter_name(thread_i, "time");
856 _perf_time = PerfDataManager::create_counter(SUN_CI, name,
857 PerfData::U_Ticks, CHECK);
859 name = PerfDataManager::counter_name(thread_i, "compiles");
860 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
861 PerfData::U_Events, CHECK);
862 }
863 }
865 // ------------------------------------------------------------------
866 // CompileBroker::compilation_init
867 //
868 // Initialize the Compilation object
869 void CompileBroker::compilation_init() {
870 _last_method_compiled[0] = '\0';
872 // No need to initialize compilation system if we do not use it.
873 if (!UseCompiler) {
874 return;
875 }
876 #ifndef SHARK
877 // Set the interface to the current compiler(s).
878 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
879 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
880 #ifdef COMPILER1
881 if (c1_count > 0) {
882 _compilers[0] = new Compiler();
883 }
884 #endif // COMPILER1
886 #ifdef COMPILER2
887 if (c2_count > 0) {
888 _compilers[1] = new C2Compiler();
889 }
890 #endif // COMPILER2
892 #else // SHARK
893 int c1_count = 0;
894 int c2_count = 1;
896 _compilers[1] = new SharkCompiler();
897 #endif // SHARK
899 // Start the CompilerThreads
900 init_compiler_threads(c1_count, c2_count);
901 // totalTime performance counter is always created as it is required
902 // by the implementation of java.lang.management.CompilationMBean.
903 {
904 EXCEPTION_MARK;
905 _perf_total_compilation =
906 PerfDataManager::create_counter(JAVA_CI, "totalTime",
907 PerfData::U_Ticks, CHECK);
908 }
911 if (UsePerfData) {
913 EXCEPTION_MARK;
915 // create the jvmstat performance counters
916 _perf_osr_compilation =
917 PerfDataManager::create_counter(SUN_CI, "osrTime",
918 PerfData::U_Ticks, CHECK);
920 _perf_standard_compilation =
921 PerfDataManager::create_counter(SUN_CI, "standardTime",
922 PerfData::U_Ticks, CHECK);
924 _perf_total_bailout_count =
925 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
926 PerfData::U_Events, CHECK);
928 _perf_total_invalidated_count =
929 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
930 PerfData::U_Events, CHECK);
932 _perf_total_compile_count =
933 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
934 PerfData::U_Events, CHECK);
935 _perf_total_osr_compile_count =
936 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
937 PerfData::U_Events, CHECK);
939 _perf_total_standard_compile_count =
940 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
941 PerfData::U_Events, CHECK);
943 _perf_sum_osr_bytes_compiled =
944 PerfDataManager::create_counter(SUN_CI, "osrBytes",
945 PerfData::U_Bytes, CHECK);
947 _perf_sum_standard_bytes_compiled =
948 PerfDataManager::create_counter(SUN_CI, "standardBytes",
949 PerfData::U_Bytes, CHECK);
951 _perf_sum_nmethod_size =
952 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
953 PerfData::U_Bytes, CHECK);
955 _perf_sum_nmethod_code_size =
956 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
957 PerfData::U_Bytes, CHECK);
959 _perf_last_method =
960 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
961 CompilerCounters::cmname_buffer_length,
962 "", CHECK);
964 _perf_last_failed_method =
965 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
966 CompilerCounters::cmname_buffer_length,
967 "", CHECK);
969 _perf_last_invalidated_method =
970 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
971 CompilerCounters::cmname_buffer_length,
972 "", CHECK);
974 _perf_last_compile_type =
975 PerfDataManager::create_variable(SUN_CI, "lastType",
976 PerfData::U_None,
977 (jlong)CompileBroker::no_compile,
978 CHECK);
980 _perf_last_compile_size =
981 PerfDataManager::create_variable(SUN_CI, "lastSize",
982 PerfData::U_Bytes,
983 (jlong)CompileBroker::no_compile,
984 CHECK);
987 _perf_last_failed_type =
988 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
989 PerfData::U_None,
990 (jlong)CompileBroker::no_compile,
991 CHECK);
993 _perf_last_invalidated_type =
994 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
995 PerfData::U_None,
996 (jlong)CompileBroker::no_compile,
997 CHECK);
998 }
1000 _initialized = true;
1001 }
1004 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1005 AbstractCompiler* comp, TRAPS) {
1006 CompilerThread* compiler_thread = NULL;
1008 Klass* k =
1009 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1010 true, CHECK_0);
1011 instanceKlassHandle klass (THREAD, k);
1012 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1013 Handle string = java_lang_String::create_from_str(name, CHECK_0);
1015 // Initialize thread_oop to put it into the system threadGroup
1016 Handle thread_group (THREAD, Universe::system_thread_group());
1017 JavaValue result(T_VOID);
1018 JavaCalls::call_special(&result, thread_oop,
1019 klass,
1020 vmSymbols::object_initializer_name(),
1021 vmSymbols::threadgroup_string_void_signature(),
1022 thread_group,
1023 string,
1024 CHECK_0);
1026 {
1027 MutexLocker mu(Threads_lock, THREAD);
1028 compiler_thread = new CompilerThread(queue, counters);
1029 // At this point the new CompilerThread data-races with this startup
1030 // thread (which I believe is the primoridal thread and NOT the VM
1031 // thread). This means Java bytecodes being executed at startup can
1032 // queue compile jobs which will run at whatever default priority the
1033 // newly created CompilerThread runs at.
1036 // At this point it may be possible that no osthread was created for the
1037 // JavaThread due to lack of memory. We would have to throw an exception
1038 // in that case. However, since this must work and we do not allow
1039 // exceptions anyway, check and abort if this fails.
1041 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1042 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1043 "unable to create new native thread");
1044 }
1046 java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1048 // Note that this only sets the JavaThread _priority field, which by
1049 // definition is limited to Java priorities and not OS priorities.
1050 // The os-priority is set in the CompilerThread startup code itself
1052 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1054 // Note that we cannot call os::set_priority because it expects Java
1055 // priorities and we are *explicitly* using OS priorities so that it's
1056 // possible to set the compiler thread priority higher than any Java
1057 // thread.
1059 int native_prio = CompilerThreadPriority;
1060 if (native_prio == -1) {
1061 if (UseCriticalCompilerThreadPriority) {
1062 native_prio = os::java_to_os_priority[CriticalPriority];
1063 } else {
1064 native_prio = os::java_to_os_priority[NearMaxPriority];
1065 }
1066 }
1067 os::set_native_priority(compiler_thread, native_prio);
1069 java_lang_Thread::set_daemon(thread_oop());
1071 compiler_thread->set_threadObj(thread_oop());
1072 compiler_thread->set_compiler(comp);
1073 Threads::add(compiler_thread);
1074 Thread::start(compiler_thread);
1075 }
1077 // Let go of Threads_lock before yielding
1078 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1080 return compiler_thread;
1081 }
1084 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1085 EXCEPTION_MARK;
1086 #if !defined(ZERO) && !defined(SHARK)
1087 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1088 #endif // !ZERO && !SHARK
1089 // Initialize the compilation queue
1090 if (c2_compiler_count > 0) {
1091 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock);
1092 _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1093 }
1094 if (c1_compiler_count > 0) {
1095 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock);
1096 _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1097 }
1099 int compiler_count = c1_compiler_count + c2_compiler_count;
1101 _compiler_threads =
1102 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1104 char name_buffer[256];
1105 for (int i = 0; i < c2_compiler_count; i++) {
1106 // Create a name for our thread.
1107 sprintf(name_buffer, "C2 CompilerThread%d", i);
1108 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1109 // Shark and C2
1110 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1111 _compiler_threads->append(new_thread);
1112 }
1114 for (int i = c2_compiler_count; i < compiler_count; i++) {
1115 // Create a name for our thread.
1116 sprintf(name_buffer, "C1 CompilerThread%d", i);
1117 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1118 // C1
1119 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1120 _compiler_threads->append(new_thread);
1121 }
1123 if (UsePerfData) {
1124 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1125 }
1126 }
1129 /**
1130 * Set the methods on the stack as on_stack so that redefine classes doesn't
1131 * reclaim them
1132 */
1133 void CompileBroker::mark_on_stack() {
1134 if (_c2_compile_queue != NULL) {
1135 MutexLocker locker(_c2_compile_queue->lock());
1136 _c2_compile_queue->mark_on_stack();
1137 }
1138 if (_c1_compile_queue != NULL) {
1139 MutexLocker locker(_c1_compile_queue->lock());
1140 _c1_compile_queue->mark_on_stack();
1141 }
1142 }
1144 // ------------------------------------------------------------------
1145 // CompileBroker::compile_method
1146 //
1147 // Request compilation of a method.
1148 void CompileBroker::compile_method_base(methodHandle method,
1149 int osr_bci,
1150 int comp_level,
1151 methodHandle hot_method,
1152 int hot_count,
1153 const char* comment,
1154 Thread* thread) {
1155 // do nothing if compiler thread(s) is not available
1156 if (!_initialized) {
1157 return;
1158 }
1160 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1161 assert(method->method_holder()->oop_is_instance(),
1162 "sanity check");
1163 assert(!method->method_holder()->is_not_initialized(),
1164 "method holder must be initialized");
1165 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1167 if (CIPrintRequests) {
1168 tty->print("request: ");
1169 method->print_short_name(tty);
1170 if (osr_bci != InvocationEntryBci) {
1171 tty->print(" osr_bci: %d", osr_bci);
1172 }
1173 tty->print(" comment: %s count: %d", comment, hot_count);
1174 if (!hot_method.is_null()) {
1175 tty->print(" hot: ");
1176 if (hot_method() != method()) {
1177 hot_method->print_short_name(tty);
1178 } else {
1179 tty->print("yes");
1180 }
1181 }
1182 tty->cr();
1183 }
1185 // A request has been made for compilation. Before we do any
1186 // real work, check to see if the method has been compiled
1187 // in the meantime with a definitive result.
1188 if (compilation_is_complete(method, osr_bci, comp_level)) {
1189 return;
1190 }
1192 #ifndef PRODUCT
1193 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1194 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1195 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1196 return;
1197 }
1198 }
1199 #endif
1201 // If this method is already in the compile queue, then
1202 // we do not block the current thread.
1203 if (compilation_is_in_queue(method)) {
1204 // We may want to decay our counter a bit here to prevent
1205 // multiple denied requests for compilation. This is an
1206 // open compilation policy issue. Note: The other possibility,
1207 // in the case that this is a blocking compile request, is to have
1208 // all subsequent blocking requesters wait for completion of
1209 // ongoing compiles. Note that in this case we'll need a protocol
1210 // for freeing the associated compile tasks. [Or we could have
1211 // a single static monitor on which all these waiters sleep.]
1212 return;
1213 }
1215 // If the requesting thread is holding the pending list lock
1216 // then we just return. We can't risk blocking while holding
1217 // the pending list lock or a 3-way deadlock may occur
1218 // between the reference handler thread, a GC (instigated
1219 // by a compiler thread), and compiled method registration.
1220 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1221 return;
1222 }
1224 if (TieredCompilation) {
1225 // Tiered policy requires MethodCounters to exist before adding a method to
1226 // the queue. Create if we don't have them yet.
1227 method->get_method_counters(thread);
1228 }
1230 // Outputs from the following MutexLocker block:
1231 CompileTask* task = NULL;
1232 bool blocking = false;
1233 CompileQueue* queue = compile_queue(comp_level);
1235 // Acquire our lock.
1236 {
1237 MutexLocker locker(queue->lock(), thread);
1239 // Make sure the method has not slipped into the queues since
1240 // last we checked; note that those checks were "fast bail-outs".
1241 // Here we need to be more careful, see 14012000 below.
1242 if (compilation_is_in_queue(method)) {
1243 return;
1244 }
1246 // We need to check again to see if the compilation has
1247 // completed. A previous compilation may have registered
1248 // some result.
1249 if (compilation_is_complete(method, osr_bci, comp_level)) {
1250 return;
1251 }
1253 // We now know that this compilation is not pending, complete,
1254 // or prohibited. Assign a compile_id to this compilation
1255 // and check to see if it is in our [Start..Stop) range.
1256 int compile_id = assign_compile_id(method, osr_bci);
1257 if (compile_id == 0) {
1258 // The compilation falls outside the allowed range.
1259 return;
1260 }
1262 // Should this thread wait for completion of the compile?
1263 blocking = is_compile_blocking();
1265 // We will enter the compilation in the queue.
1266 // 14012000: Note that this sets the queued_for_compile bits in
1267 // the target method. We can now reason that a method cannot be
1268 // queued for compilation more than once, as follows:
1269 // Before a thread queues a task for compilation, it first acquires
1270 // the compile queue lock, then checks if the method's queued bits
1271 // are set or it has already been compiled. Thus there can not be two
1272 // instances of a compilation task for the same method on the
1273 // compilation queue. Consider now the case where the compilation
1274 // thread has already removed a task for that method from the queue
1275 // and is in the midst of compiling it. In this case, the
1276 // queued_for_compile bits must be set in the method (and these
1277 // will be visible to the current thread, since the bits were set
1278 // under protection of the compile queue lock, which we hold now.
1279 // When the compilation completes, the compiler thread first sets
1280 // the compilation result and then clears the queued_for_compile
1281 // bits. Neither of these actions are protected by a barrier (or done
1282 // under the protection of a lock), so the only guarantee we have
1283 // (on machines with TSO (Total Store Order)) is that these values
1284 // will update in that order. As a result, the only combinations of
1285 // these bits that the current thread will see are, in temporal order:
1286 // <RESULT, QUEUE> :
1287 // <0, 1> : in compile queue, but not yet compiled
1288 // <1, 1> : compiled but queue bit not cleared
1289 // <1, 0> : compiled and queue bit cleared
1290 // Because we first check the queue bits then check the result bits,
1291 // we are assured that we cannot introduce a duplicate task.
1292 // Note that if we did the tests in the reverse order (i.e. check
1293 // result then check queued bit), we could get the result bit before
1294 // the compilation completed, and the queue bit after the compilation
1295 // completed, and end up introducing a "duplicate" (redundant) task.
1296 // In that case, the compiler thread should first check if a method
1297 // has already been compiled before trying to compile it.
1298 // NOTE: in the event that there are multiple compiler threads and
1299 // there is de-optimization/recompilation, things will get hairy,
1300 // and in that case it's best to protect both the testing (here) of
1301 // these bits, and their updating (here and elsewhere) under a
1302 // common lock.
1303 task = create_compile_task(queue,
1304 compile_id, method,
1305 osr_bci, comp_level,
1306 hot_method, hot_count, comment,
1307 blocking);
1308 }
1310 if (blocking) {
1311 wait_for_completion(task);
1312 }
1313 }
1316 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1317 int comp_level,
1318 methodHandle hot_method, int hot_count,
1319 const char* comment, Thread* THREAD) {
1320 // make sure arguments make sense
1321 assert(method->method_holder()->oop_is_instance(), "not an instance method");
1322 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1323 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1324 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1325 // allow any levels for WhiteBox
1326 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1327 // return quickly if possible
1329 // lock, make sure that the compilation
1330 // isn't prohibited in a straightforward way.
1331 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1332 if (comp == NULL || !comp->can_compile_method(method) ||
1333 compilation_is_prohibited(method, osr_bci, comp_level)) {
1334 return NULL;
1335 }
1337 if (osr_bci == InvocationEntryBci) {
1338 // standard compilation
1339 nmethod* method_code = method->code();
1340 if (method_code != NULL) {
1341 if (compilation_is_complete(method, osr_bci, comp_level)) {
1342 return method_code;
1343 }
1344 }
1345 if (method->is_not_compilable(comp_level)) {
1346 return NULL;
1347 }
1348 } else {
1349 // osr compilation
1350 #ifndef TIERED
1351 // seems like an assert of dubious value
1352 assert(comp_level == CompLevel_highest_tier,
1353 "all OSR compiles are assumed to be at a single compilation lavel");
1354 #endif // TIERED
1355 // We accept a higher level osr method
1356 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1357 if (nm != NULL) return nm;
1358 if (method->is_not_osr_compilable(comp_level)) return NULL;
1359 }
1361 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1362 // some prerequisites that are compiler specific
1363 if (comp->is_c2() || comp->is_shark()) {
1364 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1365 // Resolve all classes seen in the signature of the method
1366 // we are compiling.
1367 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1368 }
1370 // If the method is native, do the lookup in the thread requesting
1371 // the compilation. Native lookups can load code, which is not
1372 // permitted during compilation.
1373 //
1374 // Note: A native method implies non-osr compilation which is
1375 // checked with an assertion at the entry of this method.
1376 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1377 bool in_base_library;
1378 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1379 if (HAS_PENDING_EXCEPTION) {
1380 // In case of an exception looking up the method, we just forget
1381 // about it. The interpreter will kick-in and throw the exception.
1382 method->set_not_compilable(); // implies is_not_osr_compilable()
1383 CLEAR_PENDING_EXCEPTION;
1384 return NULL;
1385 }
1386 assert(method->has_native_function(), "must have native code by now");
1387 }
1389 // RedefineClasses() has replaced this method; just return
1390 if (method->is_old()) {
1391 return NULL;
1392 }
1394 // JVMTI -- post_compile_event requires jmethod_id() that may require
1395 // a lock the compiling thread can not acquire. Prefetch it here.
1396 if (JvmtiExport::should_post_compiled_method_load()) {
1397 method->jmethod_id();
1398 }
1400 // do the compilation
1401 if (method->is_native()) {
1402 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1403 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1404 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1405 //
1406 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1407 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1408 AdapterHandlerLibrary::create_native_wrapper(method);
1409 } else {
1410 return NULL;
1411 }
1412 } else {
1413 // If the compiler is shut off due to code cache getting full
1414 // fail out now so blocking compiles dont hang the java thread
1415 if (!should_compile_new_jobs()) {
1416 CompilationPolicy::policy()->delay_compilation(method());
1417 return NULL;
1418 }
1419 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1420 }
1422 // return requested nmethod
1423 // We accept a higher level osr method
1424 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1425 }
1428 // ------------------------------------------------------------------
1429 // CompileBroker::compilation_is_complete
1430 //
1431 // See if compilation of this method is already complete.
1432 bool CompileBroker::compilation_is_complete(methodHandle method,
1433 int osr_bci,
1434 int comp_level) {
1435 bool is_osr = (osr_bci != standard_entry_bci);
1436 if (is_osr) {
1437 if (method->is_not_osr_compilable(comp_level)) {
1438 return true;
1439 } else {
1440 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1441 return (result != NULL);
1442 }
1443 } else {
1444 if (method->is_not_compilable(comp_level)) {
1445 return true;
1446 } else {
1447 nmethod* result = method->code();
1448 if (result == NULL) return false;
1449 return comp_level == result->comp_level();
1450 }
1451 }
1452 }
1455 /**
1456 * See if this compilation is already requested.
1457 *
1458 * Implementation note: there is only a single "is in queue" bit
1459 * for each method. This means that the check below is overly
1460 * conservative in the sense that an osr compilation in the queue
1461 * will block a normal compilation from entering the queue (and vice
1462 * versa). This can be remedied by a full queue search to disambiguate
1463 * cases. If it is deemed profitable, this may be done.
1464 */
1465 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1466 return method->queued_for_compilation();
1467 }
1469 // ------------------------------------------------------------------
1470 // CompileBroker::compilation_is_prohibited
1471 //
1472 // See if this compilation is not allowed.
1473 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1474 bool is_native = method->is_native();
1475 // Some compilers may not support the compilation of natives.
1476 AbstractCompiler *comp = compiler(comp_level);
1477 if (is_native &&
1478 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1479 method->set_not_compilable_quietly(comp_level);
1480 return true;
1481 }
1483 bool is_osr = (osr_bci != standard_entry_bci);
1484 // Some compilers may not support on stack replacement.
1485 if (is_osr &&
1486 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1487 method->set_not_osr_compilable(comp_level);
1488 return true;
1489 }
1491 // The method may be explicitly excluded by the user.
1492 bool quietly;
1493 if (CompilerOracle::should_exclude(method, quietly)) {
1494 if (!quietly) {
1495 // This does not happen quietly...
1496 ResourceMark rm;
1497 tty->print("### Excluding %s:%s",
1498 method->is_native() ? "generation of native wrapper" : "compile",
1499 (method->is_static() ? " static" : ""));
1500 method->print_short_name(tty);
1501 tty->cr();
1502 }
1503 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1504 }
1506 return false;
1507 }
1509 /**
1510 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1511 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1512 * The function also allows to generate separate compilation IDs for OSR compilations.
1513 */
1514 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1515 #ifdef ASSERT
1516 bool is_osr = (osr_bci != standard_entry_bci);
1517 int id;
1518 if (method->is_native()) {
1519 assert(!is_osr, "can't be osr");
1520 // Adapters, native wrappers and method handle intrinsics
1521 // should be generated always.
1522 return Atomic::add(1, &_compilation_id);
1523 } else if (CICountOSR && is_osr) {
1524 id = Atomic::add(1, &_osr_compilation_id);
1525 if (CIStartOSR <= id && id < CIStopOSR) {
1526 return id;
1527 }
1528 } else {
1529 id = Atomic::add(1, &_compilation_id);
1530 if (CIStart <= id && id < CIStop) {
1531 return id;
1532 }
1533 }
1535 // Method was not in the appropriate compilation range.
1536 method->set_not_compilable_quietly();
1537 return 0;
1538 #else
1539 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1540 // only _compilation_id is incremented.
1541 return Atomic::add(1, &_compilation_id);
1542 #endif
1543 }
1545 /**
1546 * Should the current thread block until this compilation request
1547 * has been fulfilled?
1548 */
1549 bool CompileBroker::is_compile_blocking() {
1550 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1551 return !BackgroundCompilation;
1552 }
1555 // ------------------------------------------------------------------
1556 // CompileBroker::preload_classes
1557 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1558 // Move this code over from c1_Compiler.cpp
1559 ShouldNotReachHere();
1560 }
1563 // ------------------------------------------------------------------
1564 // CompileBroker::create_compile_task
1565 //
1566 // Create a CompileTask object representing the current request for
1567 // compilation. Add this task to the queue.
1568 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1569 int compile_id,
1570 methodHandle method,
1571 int osr_bci,
1572 int comp_level,
1573 methodHandle hot_method,
1574 int hot_count,
1575 const char* comment,
1576 bool blocking) {
1577 CompileTask* new_task = CompileTask::allocate();
1578 new_task->initialize(compile_id, method, osr_bci, comp_level,
1579 hot_method, hot_count, comment,
1580 blocking);
1581 queue->add(new_task);
1582 return new_task;
1583 }
1586 /**
1587 * Wait for the compilation task to complete.
1588 */
1589 void CompileBroker::wait_for_completion(CompileTask* task) {
1590 if (CIPrintCompileQueue) {
1591 ttyLocker ttyl;
1592 tty->print_cr("BLOCKING FOR COMPILE");
1593 }
1595 assert(task->is_blocking(), "can only wait on blocking task");
1597 JavaThread* thread = JavaThread::current();
1598 thread->set_blocked_on_compilation(true);
1600 methodHandle method(thread, task->method());
1601 {
1602 MutexLocker waiter(task->lock(), thread);
1604 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1605 task->lock()->wait();
1606 }
1607 }
1609 thread->set_blocked_on_compilation(false);
1610 if (is_compilation_disabled_forever()) {
1611 CompileTask::free(task);
1612 return;
1613 }
1615 // It is harmless to check this status without the lock, because
1616 // completion is a stable property (until the task object is recycled).
1617 assert(task->is_complete(), "Compilation should have completed");
1618 assert(task->code_handle() == NULL, "must be reset");
1620 // By convention, the waiter is responsible for recycling a
1621 // blocking CompileTask. Since there is only one waiter ever
1622 // waiting on a CompileTask, we know that no one else will
1623 // be using this CompileTask; we can free it.
1624 CompileTask::free(task);
1625 }
1627 /**
1628 * Initialize compiler thread(s) + compiler object(s). The postcondition
1629 * of this function is that the compiler runtimes are initialized and that
1630 * compiler threads can start compiling.
1631 */
1632 bool CompileBroker::init_compiler_runtime() {
1633 CompilerThread* thread = CompilerThread::current();
1634 AbstractCompiler* comp = thread->compiler();
1635 // Final sanity check - the compiler object must exist
1636 guarantee(comp != NULL, "Compiler object must exist");
1638 int system_dictionary_modification_counter;
1639 {
1640 MutexLocker locker(Compile_lock, thread);
1641 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1642 }
1644 {
1645 // Must switch to native to allocate ci_env
1646 ThreadToNativeFromVM ttn(thread);
1647 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1648 // Cache Jvmti state
1649 ci_env.cache_jvmti_state();
1650 // Cache DTrace flags
1651 ci_env.cache_dtrace_flags();
1653 // Switch back to VM state to do compiler initialization
1654 ThreadInVMfromNative tv(thread);
1655 ResetNoHandleMark rnhm;
1658 if (!comp->is_shark()) {
1659 // Perform per-thread and global initializations
1660 comp->initialize();
1661 }
1662 }
1664 if (comp->is_failed()) {
1665 disable_compilation_forever();
1666 // If compiler initialization failed, no compiler thread that is specific to a
1667 // particular compiler runtime will ever start to compile methods.
1668 shutdown_compiler_runtime(comp, thread);
1669 return false;
1670 }
1672 // C1 specific check
1673 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1674 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1675 return false;
1676 }
1678 return true;
1679 }
1681 /**
1682 * If C1 and/or C2 initialization failed, we shut down all compilation.
1683 * We do this to keep things simple. This can be changed if it ever turns
1684 * out to be a problem.
1685 */
1686 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1687 // Free buffer blob, if allocated
1688 if (thread->get_buffer_blob() != NULL) {
1689 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1690 CodeCache::free(thread->get_buffer_blob());
1691 }
1693 if (comp->should_perform_shutdown()) {
1694 // There are two reasons for shutting down the compiler
1695 // 1) compiler runtime initialization failed
1696 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1697 warning("%s initialization failed. Shutting down all compilers", comp->name());
1699 // Only one thread per compiler runtime object enters here
1700 // Set state to shut down
1701 comp->set_shut_down();
1703 // Delete all queued compilation tasks to make compiler threads exit faster.
1704 if (_c1_compile_queue != NULL) {
1705 _c1_compile_queue->free_all();
1706 }
1708 if (_c2_compile_queue != NULL) {
1709 _c2_compile_queue->free_all();
1710 }
1712 // Set flags so that we continue execution with using interpreter only.
1713 UseCompiler = false;
1714 UseInterpreter = true;
1716 // We could delete compiler runtimes also. However, there are references to
1717 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1718 // fail. This can be done later if necessary.
1719 }
1720 }
1722 // ------------------------------------------------------------------
1723 // CompileBroker::compiler_thread_loop
1724 //
1725 // The main loop run by a CompilerThread.
1726 void CompileBroker::compiler_thread_loop() {
1727 CompilerThread* thread = CompilerThread::current();
1728 CompileQueue* queue = thread->queue();
1729 // For the thread that initializes the ciObjectFactory
1730 // this resource mark holds all the shared objects
1731 ResourceMark rm;
1733 // First thread to get here will initialize the compiler interface
1735 if (!ciObjectFactory::is_initialized()) {
1736 ASSERT_IN_VM;
1737 MutexLocker only_one (CompileThread_lock, thread);
1738 if (!ciObjectFactory::is_initialized()) {
1739 ciObjectFactory::initialize();
1740 }
1741 }
1743 // Open a log.
1744 if (LogCompilation) {
1745 init_compiler_thread_log();
1746 }
1747 CompileLog* log = thread->log();
1748 if (log != NULL) {
1749 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1750 thread->name(),
1751 os::current_thread_id(),
1752 os::current_process_id());
1753 log->stamp();
1754 log->end_elem();
1755 }
1757 // If compiler thread/runtime initialization fails, exit the compiler thread
1758 if (!init_compiler_runtime()) {
1759 return;
1760 }
1762 // Poll for new compilation tasks as long as the JVM runs. Compilation
1763 // should only be disabled if something went wrong while initializing the
1764 // compiler runtimes. This, in turn, should not happen. The only known case
1765 // when compiler runtime initialization fails is if there is not enough free
1766 // space in the code cache to generate the necessary stubs, etc.
1767 while (!is_compilation_disabled_forever()) {
1768 // We need this HandleMark to avoid leaking VM handles.
1769 HandleMark hm(thread);
1771 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1772 // the code cache is really full
1773 handle_full_code_cache();
1774 }
1776 CompileTask* task = queue->get();
1777 if (task == NULL) {
1778 continue;
1779 }
1781 // Give compiler threads an extra quanta. They tend to be bursty and
1782 // this helps the compiler to finish up the job.
1783 if( CompilerThreadHintNoPreempt )
1784 os::hint_no_preempt();
1786 // trace per thread time and compile statistics
1787 CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1788 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1790 // Assign the task to the current thread. Mark this compilation
1791 // thread as active for the profiler.
1792 CompileTaskWrapper ctw(task);
1793 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1794 task->set_code_handle(&result_handle);
1795 methodHandle method(thread, task->method());
1797 // Never compile a method if breakpoints are present in it
1798 if (method()->number_of_breakpoints() == 0) {
1799 // Compile the method.
1800 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1801 invoke_compiler_on_method(task);
1802 } else {
1803 // After compilation is disabled, remove remaining methods from queue
1804 method->clear_queued_for_compilation();
1805 task->set_failure_reason("compilation is disabled");
1806 }
1807 }
1808 }
1810 // Shut down compiler runtime
1811 shutdown_compiler_runtime(thread->compiler(), thread);
1812 }
1814 // ------------------------------------------------------------------
1815 // CompileBroker::init_compiler_thread_log
1816 //
1817 // Set up state required by +LogCompilation.
1818 void CompileBroker::init_compiler_thread_log() {
1819 CompilerThread* thread = CompilerThread::current();
1820 char file_name[4*K];
1821 FILE* fp = NULL;
1822 intx thread_id = os::current_thread_id();
1823 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1824 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1825 if (dir == NULL) {
1826 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1827 thread_id, os::current_process_id());
1828 } else {
1829 jio_snprintf(file_name, sizeof(file_name),
1830 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1831 os::file_separator(), thread_id, os::current_process_id());
1832 }
1834 fp = fopen(file_name, "at");
1835 if (fp != NULL) {
1836 if (LogCompilation && Verbose) {
1837 tty->print_cr("Opening compilation log %s", file_name);
1838 }
1839 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1840 thread->init_log(log);
1842 if (xtty != NULL) {
1843 ttyLocker ttyl;
1844 // Record any per thread log files
1845 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1846 }
1847 return;
1848 }
1849 }
1850 warning("Cannot open log file: %s", file_name);
1851 }
1853 // ------------------------------------------------------------------
1854 // CompileBroker::set_should_block
1855 //
1856 // Set _should_block.
1857 // Call this from the VM, with Threads_lock held and a safepoint requested.
1858 void CompileBroker::set_should_block() {
1859 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1860 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1861 #ifndef PRODUCT
1862 if (PrintCompilation && (Verbose || WizardMode))
1863 tty->print_cr("notifying compiler thread pool to block");
1864 #endif
1865 _should_block = true;
1866 }
1868 // ------------------------------------------------------------------
1869 // CompileBroker::maybe_block
1870 //
1871 // Call this from the compiler at convenient points, to poll for _should_block.
1872 void CompileBroker::maybe_block() {
1873 if (_should_block) {
1874 #ifndef PRODUCT
1875 if (PrintCompilation && (Verbose || WizardMode))
1876 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1877 #endif
1878 ThreadInVMfromNative tivfn(JavaThread::current());
1879 }
1880 }
1882 // wrapper for CodeCache::print_summary()
1883 static void codecache_print(bool detailed)
1884 {
1885 ResourceMark rm;
1886 stringStream s;
1887 // Dump code cache into a buffer before locking the tty,
1888 {
1889 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1890 CodeCache::print_summary(&s, detailed);
1891 }
1892 ttyLocker ttyl;
1893 tty->print("%s", s.as_string());
1894 }
1896 // ------------------------------------------------------------------
1897 // CompileBroker::invoke_compiler_on_method
1898 //
1899 // Compile a method.
1900 //
1901 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1902 if (PrintCompilation) {
1903 ResourceMark rm;
1904 task->print_line();
1905 }
1906 elapsedTimer time;
1908 CompilerThread* thread = CompilerThread::current();
1909 ResourceMark rm(thread);
1911 if (LogEvents) {
1912 _compilation_log->log_compile(thread, task);
1913 }
1915 // Common flags.
1916 uint compile_id = task->compile_id();
1917 int osr_bci = task->osr_bci();
1918 bool is_osr = (osr_bci != standard_entry_bci);
1919 bool should_log = (thread->log() != NULL);
1920 bool should_break = false;
1921 int task_level = task->comp_level();
1922 {
1923 // create the handle inside it's own block so it can't
1924 // accidentally be referenced once the thread transitions to
1925 // native. The NoHandleMark before the transition should catch
1926 // any cases where this occurs in the future.
1927 methodHandle method(thread, task->method());
1928 should_break = check_break_at(method, compile_id, is_osr);
1929 if (should_log && !CompilerOracle::should_log(method)) {
1930 should_log = false;
1931 }
1932 assert(!method->is_native(), "no longer compile natives");
1934 // Save information about this method in case of failure.
1935 set_last_compile(thread, method, is_osr, task_level);
1937 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1938 }
1940 // Allocate a new set of JNI handles.
1941 push_jni_handle_block();
1942 Method* target_handle = task->method();
1943 int compilable = ciEnv::MethodCompilable;
1944 {
1945 int system_dictionary_modification_counter;
1946 {
1947 MutexLocker locker(Compile_lock, thread);
1948 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1949 }
1951 NoHandleMark nhm;
1952 ThreadToNativeFromVM ttn(thread);
1954 ciEnv ci_env(task, system_dictionary_modification_counter);
1955 if (should_break) {
1956 ci_env.set_break_at_compile(true);
1957 }
1958 if (should_log) {
1959 ci_env.set_log(thread->log());
1960 }
1961 assert(thread->env() == &ci_env, "set by ci_env");
1962 // The thread-env() field is cleared in ~CompileTaskWrapper.
1964 // Cache Jvmti state
1965 ci_env.cache_jvmti_state();
1967 // Cache DTrace flags
1968 ci_env.cache_dtrace_flags();
1970 ciMethod* target = ci_env.get_method_from_handle(target_handle);
1972 TraceTime t1("compilation", &time);
1973 EventCompilation event;
1975 AbstractCompiler *comp = compiler(task_level);
1976 if (comp == NULL) {
1977 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1978 } else {
1979 comp->compile_method(&ci_env, target, osr_bci);
1980 }
1982 if (!ci_env.failing() && task->code() == NULL) {
1983 //assert(false, "compiler should always document failure");
1984 // The compiler elected, without comment, not to register a result.
1985 // Do not attempt further compilations of this method.
1986 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1987 }
1989 // Copy this bit to the enclosing block:
1990 compilable = ci_env.compilable();
1992 if (ci_env.failing()) {
1993 task->set_failure_reason(ci_env.failure_reason());
1994 const char* retry_message = ci_env.retry_message();
1995 if (_compilation_log != NULL) {
1996 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1997 }
1998 if (PrintCompilation) {
1999 FormatBufferResource msg = retry_message != NULL ?
2000 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2001 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason());
2002 task->print_compilation(tty, msg);
2003 }
2004 } else {
2005 task->mark_success();
2006 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2007 if (_compilation_log != NULL) {
2008 nmethod* code = task->code();
2009 if (code != NULL) {
2010 _compilation_log->log_nmethod(thread, code);
2011 }
2012 }
2013 }
2014 // simulate crash during compilation
2015 assert(task->compile_id() != CICrashAt, "just as planned");
2016 if (event.should_commit()) {
2017 event.set_method(target->get_Method());
2018 event.set_compileID(compile_id);
2019 event.set_compileLevel(task->comp_level());
2020 event.set_succeded(task->is_success());
2021 event.set_isOsr(is_osr);
2022 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2023 event.set_inlinedBytes(task->num_inlined_bytecodes());
2024 event.commit();
2025 }
2026 }
2027 pop_jni_handle_block();
2029 methodHandle method(thread, task->method());
2031 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2033 collect_statistics(thread, time, task);
2035 if (PrintCompilation && PrintCompilation2) {
2036 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2037 tty->print("%4d ", compile_id); // print compilation number
2038 tty->print("%s ", (is_osr ? "%" : " "));
2039 if (task->code() != NULL) {
2040 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2041 }
2042 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2043 }
2045 if (PrintCodeCacheOnCompilation)
2046 codecache_print(/* detailed= */ false);
2048 // Disable compilation, if required.
2049 switch (compilable) {
2050 case ciEnv::MethodCompilable_never:
2051 if (is_osr)
2052 method->set_not_osr_compilable_quietly();
2053 else
2054 method->set_not_compilable_quietly();
2055 break;
2056 case ciEnv::MethodCompilable_not_at_tier:
2057 if (is_osr)
2058 method->set_not_osr_compilable_quietly(task_level);
2059 else
2060 method->set_not_compilable_quietly(task_level);
2061 break;
2062 }
2064 // Note that the queued_for_compilation bits are cleared without
2065 // protection of a mutex. [They were set by the requester thread,
2066 // when adding the task to the compile queue -- at which time the
2067 // compile queue lock was held. Subsequently, we acquired the compile
2068 // queue lock to get this task off the compile queue; thus (to belabour
2069 // the point somewhat) our clearing of the bits must be occurring
2070 // only after the setting of the bits. See also 14012000 above.
2071 method->clear_queued_for_compilation();
2073 #ifdef ASSERT
2074 if (CollectedHeap::fired_fake_oom()) {
2075 // The current compile received a fake OOM during compilation so
2076 // go ahead and exit the VM since the test apparently succeeded
2077 tty->print_cr("*** Shutting down VM after successful fake OOM");
2078 vm_exit(0);
2079 }
2080 #endif
2081 }
2083 /**
2084 * The CodeCache is full. Print out warning and disable compilation
2085 * or try code cache cleaning so compilation can continue later.
2086 */
2087 void CompileBroker::handle_full_code_cache() {
2088 UseInterpreter = true;
2089 if (UseCompiler || AlwaysCompileLoopMethods ) {
2090 if (xtty != NULL) {
2091 ResourceMark rm;
2092 stringStream s;
2093 // Dump code cache state into a buffer before locking the tty,
2094 // because log_state() will use locks causing lock conflicts.
2095 CodeCache::log_state(&s);
2096 // Lock to prevent tearing
2097 ttyLocker ttyl;
2098 xtty->begin_elem("code_cache_full");
2099 xtty->print("%s", s.as_string());
2100 xtty->stamp();
2101 xtty->end_elem();
2102 }
2104 CodeCache::report_codemem_full();
2106 #ifndef PRODUCT
2107 if (CompileTheWorld || ExitOnFullCodeCache) {
2108 codecache_print(/* detailed= */ true);
2109 before_exit(JavaThread::current());
2110 exit_globals(); // will delete tty
2111 vm_direct_exit(CompileTheWorld ? 0 : 1);
2112 }
2113 #endif
2114 if (UseCodeCacheFlushing) {
2115 // Since code cache is full, immediately stop new compiles
2116 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2117 NMethodSweeper::log_sweep("disable_compiler");
2118 }
2119 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2120 // without having to consider the state in which the current thread is.
2121 ThreadInVMfromUnknown in_vm;
2122 NMethodSweeper::possibly_sweep();
2123 } else {
2124 disable_compilation_forever();
2125 }
2127 // Print warning only once
2128 if (should_print_compiler_warning()) {
2129 warning("CodeCache is full. Compiler has been disabled.");
2130 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2131 codecache_print(/* detailed= */ true);
2132 }
2133 }
2134 }
2136 // ------------------------------------------------------------------
2137 // CompileBroker::set_last_compile
2138 //
2139 // Record this compilation for debugging purposes.
2140 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2141 ResourceMark rm;
2142 char* method_name = method->name()->as_C_string();
2143 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2144 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2145 char current_method[CompilerCounters::cmname_buffer_length];
2146 size_t maxLen = CompilerCounters::cmname_buffer_length;
2148 if (UsePerfData) {
2149 const char* class_name = method->method_holder()->name()->as_C_string();
2151 size_t s1len = strlen(class_name);
2152 size_t s2len = strlen(method_name);
2154 // check if we need to truncate the string
2155 if (s1len + s2len + 2 > maxLen) {
2157 // the strategy is to lop off the leading characters of the
2158 // class name and the trailing characters of the method name.
2160 if (s2len + 2 > maxLen) {
2161 // lop of the entire class name string, let snprintf handle
2162 // truncation of the method name.
2163 class_name += s1len; // null string
2164 }
2165 else {
2166 // lop off the extra characters from the front of the class name
2167 class_name += ((s1len + s2len + 2) - maxLen);
2168 }
2169 }
2171 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2172 }
2174 if (CICountOSR && is_osr) {
2175 _last_compile_type = osr_compile;
2176 } else {
2177 _last_compile_type = normal_compile;
2178 }
2179 _last_compile_level = comp_level;
2181 if (UsePerfData) {
2182 CompilerCounters* counters = thread->counters();
2183 counters->set_current_method(current_method);
2184 counters->set_compile_type((jlong)_last_compile_type);
2185 }
2186 }
2189 // ------------------------------------------------------------------
2190 // CompileBroker::push_jni_handle_block
2191 //
2192 // Push on a new block of JNI handles.
2193 void CompileBroker::push_jni_handle_block() {
2194 JavaThread* thread = JavaThread::current();
2196 // Allocate a new block for JNI handles.
2197 // Inlined code from jni_PushLocalFrame()
2198 JNIHandleBlock* java_handles = thread->active_handles();
2199 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2200 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2201 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2202 thread->set_active_handles(compile_handles);
2203 }
2206 // ------------------------------------------------------------------
2207 // CompileBroker::pop_jni_handle_block
2208 //
2209 // Pop off the current block of JNI handles.
2210 void CompileBroker::pop_jni_handle_block() {
2211 JavaThread* thread = JavaThread::current();
2213 // Release our JNI handle block
2214 JNIHandleBlock* compile_handles = thread->active_handles();
2215 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2216 thread->set_active_handles(java_handles);
2217 compile_handles->set_pop_frame_link(NULL);
2218 JNIHandleBlock::release_block(compile_handles, thread); // may block
2219 }
2222 // ------------------------------------------------------------------
2223 // CompileBroker::check_break_at
2224 //
2225 // Should the compilation break at the current compilation.
2226 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2227 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2228 return true;
2229 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2230 return true;
2231 } else {
2232 return (compile_id == CIBreakAt);
2233 }
2234 }
2236 // ------------------------------------------------------------------
2237 // CompileBroker::collect_statistics
2238 //
2239 // Collect statistics about the compilation.
2241 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2242 bool success = task->is_success();
2243 methodHandle method (thread, task->method());
2244 uint compile_id = task->compile_id();
2245 bool is_osr = (task->osr_bci() != standard_entry_bci);
2246 nmethod* code = task->code();
2247 CompilerCounters* counters = thread->counters();
2249 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2250 MutexLocker locker(CompileStatistics_lock);
2252 // _perf variables are production performance counters which are
2253 // updated regardless of the setting of the CITime and CITimeEach flags
2254 //
2255 if (!success) {
2256 _total_bailout_count++;
2257 if (UsePerfData) {
2258 _perf_last_failed_method->set_value(counters->current_method());
2259 _perf_last_failed_type->set_value(counters->compile_type());
2260 _perf_total_bailout_count->inc();
2261 }
2262 } else if (code == NULL) {
2263 if (UsePerfData) {
2264 _perf_last_invalidated_method->set_value(counters->current_method());
2265 _perf_last_invalidated_type->set_value(counters->compile_type());
2266 _perf_total_invalidated_count->inc();
2267 }
2268 _total_invalidated_count++;
2269 } else {
2270 // Compilation succeeded
2272 // update compilation ticks - used by the implementation of
2273 // java.lang.management.CompilationMBean
2274 _perf_total_compilation->inc(time.ticks());
2276 _t_total_compilation.add(time);
2277 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2279 if (CITime) {
2280 if (is_osr) {
2281 _t_osr_compilation.add(time);
2282 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2283 } else {
2284 _t_standard_compilation.add(time);
2285 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2286 }
2287 }
2289 if (UsePerfData) {
2290 // save the name of the last method compiled
2291 _perf_last_method->set_value(counters->current_method());
2292 _perf_last_compile_type->set_value(counters->compile_type());
2293 _perf_last_compile_size->set_value(method->code_size() +
2294 task->num_inlined_bytecodes());
2295 if (is_osr) {
2296 _perf_osr_compilation->inc(time.ticks());
2297 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2298 } else {
2299 _perf_standard_compilation->inc(time.ticks());
2300 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2301 }
2302 }
2304 if (CITimeEach) {
2305 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2306 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2307 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2308 }
2310 // Collect counts of successful compilations
2311 _sum_nmethod_size += code->total_size();
2312 _sum_nmethod_code_size += code->insts_size();
2313 _total_compile_count++;
2315 if (UsePerfData) {
2316 _perf_sum_nmethod_size->inc( code->total_size());
2317 _perf_sum_nmethod_code_size->inc(code->insts_size());
2318 _perf_total_compile_count->inc();
2319 }
2321 if (is_osr) {
2322 if (UsePerfData) _perf_total_osr_compile_count->inc();
2323 _total_osr_compile_count++;
2324 } else {
2325 if (UsePerfData) _perf_total_standard_compile_count->inc();
2326 _total_standard_compile_count++;
2327 }
2328 }
2329 // set the current method for the thread to null
2330 if (UsePerfData) counters->set_current_method("");
2331 }
2333 const char* CompileBroker::compiler_name(int comp_level) {
2334 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2335 if (comp == NULL) {
2336 return "no compiler";
2337 } else {
2338 return (comp->name());
2339 }
2340 }
2342 void CompileBroker::print_times() {
2343 tty->cr();
2344 tty->print_cr("Accumulated compiler times (for compiled methods only)");
2345 tty->print_cr("------------------------------------------------");
2346 //0000000000111111111122222222223333333333444444444455555555556666666666
2347 //0123456789012345678901234567890123456789012345678901234567890123456789
2348 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2349 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f",
2350 CompileBroker::_t_standard_compilation.seconds(),
2351 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2352 tty->print_cr(" On stack replacement : %6.3f s, Average : %2.3f", CompileBroker::_t_osr_compilation.seconds(), CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2354 AbstractCompiler *comp = compiler(CompLevel_simple);
2355 if (comp != NULL) {
2356 comp->print_timers();
2357 }
2358 comp = compiler(CompLevel_full_optimization);
2359 if (comp != NULL) {
2360 comp->print_timers();
2361 }
2362 tty->cr();
2363 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count);
2364 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count);
2365 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count);
2366 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2367 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb);
2368 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2369 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2370 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2371 tty->print_cr(" Average compilation speed: %6d bytes/s", bps);
2372 tty->cr();
2373 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2374 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size);
2375 }
2377 // Debugging output for failure
2378 void CompileBroker::print_last_compile() {
2379 if ( _last_compile_level != CompLevel_none &&
2380 compiler(_last_compile_level) != NULL &&
2381 _last_method_compiled != NULL &&
2382 _last_compile_type != no_compile) {
2383 if (_last_compile_type == osr_compile) {
2384 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2385 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2386 } else {
2387 tty->print_cr("Last parse: %d+++(%d) %s",
2388 _compilation_id, _last_compile_level, _last_method_compiled);
2389 }
2390 }
2391 }
2394 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2395 #ifndef PRODUCT
2396 st->print_cr("Compiler thread printing unimplemented.");
2397 st->cr();
2398 #endif
2399 }