1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "code/codeCache.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "compiler/compileLog.hpp" 31 #include "compiler/compilerOracle.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/allocation.inline.hpp" 34 #include "oops/methodData.hpp" 35 #include "oops/method.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/nativeLookup.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/atomic.inline.hpp" 40 #include "runtime/compilationPolicy.hpp" 41 #include "runtime/init.hpp" 42 #include "runtime/interfaceSupport.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/os.hpp" 45 #include "runtime/sharedRuntime.hpp" 46 #include "runtime/sweeper.hpp" 47 #include "trace/tracing.hpp" 48 #include "utilities/dtrace.hpp" 49 #include "utilities/events.hpp" 50 #ifdef COMPILER1 51 #include "c1/c1_Compiler.hpp" 52 #endif 53 #ifdef COMPILER2 54 #include "opto/c2compiler.hpp" 55 #endif 56 #ifdef SHARK 57 #include "shark/sharkCompiler.hpp" 58 #endif 59 60 #ifdef DTRACE_ENABLED 61 62 // Only bother with this argument setup if dtrace is available 63 64 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 65 { \ 66 Symbol* klass_name = (method)->klass_name(); \ 67 Symbol* name = (method)->name(); \ 68 Symbol* signature = (method)->signature(); \ 69 HOTSPOT_METHOD_COMPILE_BEGIN( \ 70 (char *) comp_name, strlen(comp_name), \ 71 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 72 (char *) name->bytes(), name->utf8_length(), \ 73 (char *) signature->bytes(), signature->utf8_length()); \ 74 } 75 76 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 77 { \ 78 Symbol* klass_name = (method)->klass_name(); \ 79 Symbol* name = (method)->name(); \ 80 Symbol* signature = (method)->signature(); \ 81 HOTSPOT_METHOD_COMPILE_END( \ 82 (char *) comp_name, strlen(comp_name), \ 83 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 84 (char *) name->bytes(), name->utf8_length(), \ 85 (char *) signature->bytes(), signature->utf8_length(), (success)); \ 86 } 87 88 #else // ndef DTRACE_ENABLED 89 90 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 91 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 92 93 #endif // ndef DTRACE_ENABLED 94 95 bool CompileBroker::_initialized = false; 96 volatile bool CompileBroker::_should_block = false; 97 volatile jint CompileBroker::_print_compilation_warning = 0; 98 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 99 100 // The installed compiler(s) 101 AbstractCompiler* CompileBroker::_compilers[2]; 102 103 // These counters are used to assign an unique ID to each compilation. 104 volatile jint CompileBroker::_compilation_id = 0; 105 volatile jint CompileBroker::_osr_compilation_id = 0; 106 107 // Debugging information 108 int CompileBroker::_last_compile_type = no_compile; 109 int CompileBroker::_last_compile_level = CompLevel_none; 110 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 111 112 // Performance counters 113 PerfCounter* CompileBroker::_perf_total_compilation = NULL; 114 PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 115 PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 116 117 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 118 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 119 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 120 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 121 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 122 123 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 124 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 125 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 126 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 127 128 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 129 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 130 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 131 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 132 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 133 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 134 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 135 136 // Timers and counters for generating statistics 137 elapsedTimer CompileBroker::_t_total_compilation; 138 elapsedTimer CompileBroker::_t_osr_compilation; 139 elapsedTimer CompileBroker::_t_standard_compilation; 140 141 int CompileBroker::_total_bailout_count = 0; 142 int CompileBroker::_total_invalidated_count = 0; 143 int CompileBroker::_total_compile_count = 0; 144 int CompileBroker::_total_osr_compile_count = 0; 145 int CompileBroker::_total_standard_compile_count = 0; 146 147 int CompileBroker::_sum_osr_bytes_compiled = 0; 148 int CompileBroker::_sum_standard_bytes_compiled = 0; 149 int CompileBroker::_sum_nmethod_size = 0; 150 int CompileBroker::_sum_nmethod_code_size = 0; 151 152 long CompileBroker::_peak_compilation_time = 0; 153 154 CompileQueue* CompileBroker::_c2_compile_queue = NULL; 155 CompileQueue* CompileBroker::_c1_compile_queue = NULL; 156 157 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL; 158 159 160 class CompilationLog : public StringEventLog { 161 public: 162 CompilationLog() : StringEventLog("Compilation events") { 163 } 164 165 void log_compile(JavaThread* thread, CompileTask* task) { 166 StringLogMessage lm; 167 stringStream sstr = lm.stream(); 168 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 169 task->print_compilation(&sstr, NULL, true); 170 log(thread, "%s", (const char*)lm); 171 } 172 173 void log_nmethod(JavaThread* thread, nmethod* nm) { 174 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]", 175 nm->compile_id(), nm->is_osr_method() ? "%" : "", 176 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end())); 177 } 178 179 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 180 StringLogMessage lm; 181 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 182 if (retry_message != NULL) { 183 lm.append(" (%s)", retry_message); 184 } 185 lm.print("\n"); 186 log(thread, "%s", (const char*)lm); 187 } 188 }; 189 190 static CompilationLog* _compilation_log = NULL; 191 192 void compileBroker_init() { 193 if (LogEvents) { 194 _compilation_log = new CompilationLog(); 195 } 196 } 197 198 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 199 CompilerThread* thread = CompilerThread::current(); 200 thread->set_task(task); 201 CompileLog* log = thread->log(); 202 if (log != NULL) task->log_task_start(log); 203 } 204 205 CompileTaskWrapper::~CompileTaskWrapper() { 206 CompilerThread* thread = CompilerThread::current(); 207 CompileTask* task = thread->task(); 208 CompileLog* log = thread->log(); 209 if (log != NULL) task->log_task_done(log); 210 thread->set_task(NULL); 211 task->set_code_handle(NULL); 212 thread->set_env(NULL); 213 if (task->is_blocking()) { 214 MutexLocker notifier(task->lock(), thread); 215 task->mark_complete(); 216 // Notify the waiting thread that the compilation has completed. 217 task->lock()->notify_all(); 218 } else { 219 task->mark_complete(); 220 221 // By convention, the compiling thread is responsible for 222 // recycling a non-blocking CompileTask. 223 CompileTask::free(task); 224 } 225 } 226 227 228 CompileTask* CompileTask::_task_free_list = NULL; 229 #ifdef ASSERT 230 int CompileTask::_num_allocated_tasks = 0; 231 #endif 232 /** 233 * Allocate a CompileTask, from the free list if possible. 234 */ 235 CompileTask* CompileTask::allocate() { 236 MutexLocker locker(CompileTaskAlloc_lock); 237 CompileTask* task = NULL; 238 239 if (_task_free_list != NULL) { 240 task = _task_free_list; 241 _task_free_list = task->next(); 242 task->set_next(NULL); 243 } else { 244 task = new CompileTask(); 245 DEBUG_ONLY(_num_allocated_tasks++;) 246 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?"); 247 task->set_next(NULL); 248 task->set_is_free(true); 249 } 250 assert(task->is_free(), "Task must be free."); 251 task->set_is_free(false); 252 return task; 253 } 254 255 256 /** 257 * Add a task to the free list. 258 */ 259 void CompileTask::free(CompileTask* task) { 260 MutexLocker locker(CompileTaskAlloc_lock); 261 if (!task->is_free()) { 262 task->set_code(NULL); 263 assert(!task->lock()->is_locked(), "Should not be locked when freed"); 264 JNIHandles::destroy_global(task->_method_holder); 265 JNIHandles::destroy_global(task->_hot_method_holder); 266 267 task->set_is_free(true); 268 task->set_next(_task_free_list); 269 _task_free_list = task; 270 } 271 } 272 273 void CompileTask::initialize(int compile_id, 274 methodHandle method, 275 int osr_bci, 276 int comp_level, 277 methodHandle hot_method, 278 int hot_count, 279 const char* comment, 280 bool is_blocking) { 281 assert(!_lock->is_locked(), "bad locking"); 282 283 _compile_id = compile_id; 284 _method = method(); 285 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 286 _osr_bci = osr_bci; 287 _is_blocking = is_blocking; 288 _comp_level = comp_level; 289 _num_inlined_bytecodes = 0; 290 291 _is_complete = false; 292 _is_success = false; 293 _code_handle = NULL; 294 295 _hot_method = NULL; 296 _hot_method_holder = NULL; 297 _hot_count = hot_count; 298 _time_queued = 0; // tidy 299 _comment = comment; 300 _failure_reason = NULL; 301 302 if (LogCompilation) { 303 _time_queued = os::elapsed_counter(); 304 if (hot_method.not_null()) { 305 if (hot_method == method) { 306 _hot_method = _method; 307 } else { 308 _hot_method = hot_method(); 309 // only add loader or mirror if different from _method_holder 310 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 311 } 312 } 313 } 314 315 _next = NULL; 316 } 317 318 // ------------------------------------------------------------------ 319 // CompileTask::code/set_code 320 nmethod* CompileTask::code() const { 321 if (_code_handle == NULL) return NULL; 322 return _code_handle->code(); 323 } 324 void CompileTask::set_code(nmethod* nm) { 325 if (_code_handle == NULL && nm == NULL) return; 326 guarantee(_code_handle != NULL, ""); 327 _code_handle->set_code(nm); 328 if (nm == NULL) _code_handle = NULL; // drop the handle also 329 } 330 331 332 void CompileTask::mark_on_stack() { 333 // Mark these methods as something redefine classes cannot remove. 334 _method->set_on_stack(true); 335 if (_hot_method != NULL) { 336 _hot_method->set_on_stack(true); 337 } 338 } 339 340 // ------------------------------------------------------------------ 341 // CompileTask::print 342 void CompileTask::print() { 343 tty->print("<CompileTask compile_id=%d ", _compile_id); 344 tty->print("method="); 345 _method->print_name(tty); 346 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>", 347 _osr_bci, bool_to_str(_is_blocking), 348 bool_to_str(_is_complete), bool_to_str(_is_success)); 349 } 350 351 352 // ------------------------------------------------------------------ 353 // CompileTask::print_line_on_error 354 // 355 // This function is called by fatal error handler when the thread 356 // causing troubles is a compiler thread. 357 // 358 // Do not grab any lock, do not allocate memory. 359 // 360 // Otherwise it's the same as CompileTask::print_line() 361 // 362 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 363 // print compiler name 364 st->print("%s:", CompileBroker::compiler_name(comp_level())); 365 print_compilation(st); 366 } 367 368 // ------------------------------------------------------------------ 369 // CompileTask::print_line 370 void CompileTask::print_line() { 371 ttyLocker ttyl; // keep the following output all in one block 372 // print compiler name if requested 373 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 374 print_compilation(); 375 } 376 377 378 // ------------------------------------------------------------------ 379 // CompileTask::print_compilation_impl 380 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 381 bool is_osr_method, int osr_bci, bool is_blocking, 382 const char* msg, bool short_form) { 383 if (!short_form) { 384 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 385 } 386 st->print("%4d ", compile_id); // print compilation number 387 388 // For unloaded methods the transition to zombie occurs after the 389 // method is cleared so it's impossible to report accurate 390 // information for that case. 391 bool is_synchronized = false; 392 bool has_exception_handler = false; 393 bool is_native = false; 394 if (method != NULL) { 395 is_synchronized = method->is_synchronized(); 396 has_exception_handler = method->has_exception_handler(); 397 is_native = method->is_native(); 398 } 399 // method attributes 400 const char compile_type = is_osr_method ? '%' : ' '; 401 const char sync_char = is_synchronized ? 's' : ' '; 402 const char exception_char = has_exception_handler ? '!' : ' '; 403 const char blocking_char = is_blocking ? 'b' : ' '; 404 const char native_char = is_native ? 'n' : ' '; 405 406 // print method attributes 407 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 408 409 if (TieredCompilation) { 410 if (comp_level != -1) st->print("%d ", comp_level); 411 else st->print("- "); 412 } 413 st->print(" "); // more indent 414 415 if (method == NULL) { 416 st->print("(method)"); 417 } else { 418 method->print_short_name(st); 419 if (is_osr_method) { 420 st->print(" @ %d", osr_bci); 421 } 422 if (method->is_native()) 423 st->print(" (native)"); 424 else 425 st->print(" (%d bytes)", method->code_size()); 426 } 427 428 if (msg != NULL) { 429 st->print(" %s", msg); 430 } 431 if (!short_form) { 432 st->cr(); 433 } 434 } 435 436 // ------------------------------------------------------------------ 437 // CompileTask::print_inlining 438 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 439 // 1234567 440 st->print(" "); // print timestamp 441 // 1234 442 st->print(" "); // print compilation number 443 444 // method attributes 445 if (method->is_loaded()) { 446 const char sync_char = method->is_synchronized() ? 's' : ' '; 447 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 448 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 449 450 // print method attributes 451 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 452 } else { 453 // %s!bn 454 st->print(" "); // print method attributes 455 } 456 457 if (TieredCompilation) { 458 st->print(" "); 459 } 460 st->print(" "); // more indent 461 st->print(" "); // initial inlining indent 462 463 for (int i = 0; i < inline_level; i++) st->print(" "); 464 465 st->print("@ %d ", bci); // print bci 466 method->print_short_name(st); 467 if (method->is_loaded()) 468 st->print(" (%d bytes)", method->code_size()); 469 else 470 st->print(" (not loaded)"); 471 472 if (msg != NULL) { 473 st->print(" %s", msg); 474 } 475 st->cr(); 476 } 477 478 // ------------------------------------------------------------------ 479 // CompileTask::print_inline_indent 480 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 481 // 1234567 482 st->print(" "); // print timestamp 483 // 1234 484 st->print(" "); // print compilation number 485 // %s!bn 486 st->print(" "); // print method attributes 487 if (TieredCompilation) { 488 st->print(" "); 489 } 490 st->print(" "); // more indent 491 st->print(" "); // initial inlining indent 492 for (int i = 0; i < inline_level; i++) st->print(" "); 493 } 494 495 // ------------------------------------------------------------------ 496 // CompileTask::print_compilation 497 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) { 498 bool is_osr_method = osr_bci() != InvocationEntryBci; 499 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form); 500 } 501 502 // ------------------------------------------------------------------ 503 // CompileTask::log_task 504 void CompileTask::log_task(xmlStream* log) { 505 Thread* thread = Thread::current(); 506 methodHandle method(thread, this->method()); 507 ResourceMark rm(thread); 508 509 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 510 log->print(" compile_id='%d'", _compile_id); 511 if (_osr_bci != CompileBroker::standard_entry_bci) { 512 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 513 } // else compile_kind='c2c' 514 if (!method.is_null()) log->method(method); 515 if (_osr_bci != CompileBroker::standard_entry_bci) { 516 log->print(" osr_bci='%d'", _osr_bci); 517 } 518 if (_comp_level != CompLevel_highest_tier) { 519 log->print(" level='%d'", _comp_level); 520 } 521 if (_is_blocking) { 522 log->print(" blocking='1'"); 523 } 524 log->stamp(); 525 } 526 527 528 // ------------------------------------------------------------------ 529 // CompileTask::log_task_queued 530 void CompileTask::log_task_queued() { 531 Thread* thread = Thread::current(); 532 ttyLocker ttyl; 533 ResourceMark rm(thread); 534 535 xtty->begin_elem("task_queued"); 536 log_task(xtty); 537 if (_comment != NULL) { 538 xtty->print(" comment='%s'", _comment); 539 } 540 if (_hot_method != NULL) { 541 methodHandle hot(thread, _hot_method); 542 methodHandle method(thread, _method); 543 if (hot() != method()) { 544 xtty->method(hot); 545 } 546 } 547 if (_hot_count != 0) { 548 xtty->print(" hot_count='%d'", _hot_count); 549 } 550 xtty->end_elem(); 551 } 552 553 554 // ------------------------------------------------------------------ 555 // CompileTask::log_task_start 556 void CompileTask::log_task_start(CompileLog* log) { 557 log->begin_head("task"); 558 log_task(log); 559 log->end_head(); 560 } 561 562 563 // ------------------------------------------------------------------ 564 // CompileTask::log_task_done 565 void CompileTask::log_task_done(CompileLog* log) { 566 Thread* thread = Thread::current(); 567 methodHandle method(thread, this->method()); 568 ResourceMark rm(thread); 569 570 if (!_is_success) { 571 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown"; 572 log->elem("failure reason='%s'", reason); 573 } 574 575 // <task_done ... stamp='1.234'> </task> 576 nmethod* nm = code(); 577 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 578 _is_success, nm == NULL ? 0 : nm->content_size(), 579 method->invocation_count()); 580 int bec = method->backedge_count(); 581 if (bec != 0) log->print(" backedge_count='%d'", bec); 582 // Note: "_is_complete" is about to be set, but is not. 583 if (_num_inlined_bytecodes != 0) { 584 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 585 } 586 log->stamp(); 587 log->end_elem(); 588 log->tail("task"); 589 log->clear_identities(); // next task will have different CI 590 if (log->unflushed_count() > 2000) { 591 log->flush(); 592 } 593 log->mark_file_end(); 594 } 595 596 597 598 /** 599 * Add a CompileTask to a CompileQueue. 600 */ 601 void CompileQueue::add(CompileTask* task) { 602 assert(lock()->owned_by_self(), "must own lock"); 603 604 task->set_next(NULL); 605 task->set_prev(NULL); 606 607 if (_last == NULL) { 608 // The compile queue is empty. 609 assert(_first == NULL, "queue is empty"); 610 _first = task; 611 _last = task; 612 } else { 613 // Append the task to the queue. 614 assert(_last->next() == NULL, "not last"); 615 _last->set_next(task); 616 task->set_prev(_last); 617 _last = task; 618 } 619 ++_size; 620 621 // Mark the method as being in the compile queue. 622 task->method()->set_queued_for_compilation(); 623 624 NOT_PRODUCT(print();) 625 626 if (LogCompilation && xtty != NULL) { 627 task->log_task_queued(); 628 } 629 630 // Notify CompilerThreads that a task is available. 631 lock()->notify_all(); 632 } 633 634 /** 635 * Empties compilation queue by putting all compilation tasks onto 636 * a freelist. Furthermore, the method wakes up all threads that are 637 * waiting on a compilation task to finish. This can happen if background 638 * compilation is disabled. 639 */ 640 void CompileQueue::free_all() { 641 MutexLocker mu(lock()); 642 CompileTask* next = _first; 643 644 // Iterate over all tasks in the compile queue 645 while (next != NULL) { 646 CompileTask* current = next; 647 next = current->next(); 648 { 649 // Wake up thread that blocks on the compile task. 650 MutexLocker ct_lock(current->lock()); 651 current->lock()->notify(); 652 } 653 // Put the task back on the freelist. 654 CompileTask::free(current); 655 } 656 _first = NULL; 657 658 // Wake up all threads that block on the queue. 659 lock()->notify_all(); 660 } 661 662 // ------------------------------------------------------------------ 663 // CompileQueue::get 664 // 665 // Get the next CompileTask from a CompileQueue 666 CompileTask* CompileQueue::get() { 667 NMethodSweeper::possibly_sweep(); 668 669 MutexLocker locker(lock()); 670 // If _first is NULL we have no more compile jobs. There are two reasons for 671 // having no compile jobs: First, we compiled everything we wanted. Second, 672 // we ran out of code cache so compilation has been disabled. In the latter 673 // case we perform code cache sweeps to free memory such that we can re-enable 674 // compilation. 675 while (_first == NULL) { 676 // Exit loop if compilation is disabled forever 677 if (CompileBroker::is_compilation_disabled_forever()) { 678 return NULL; 679 } 680 681 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 682 // Wait a certain amount of time to possibly do another sweep. 683 // We must wait until stack scanning has happened so that we can 684 // transition a method's state from 'not_entrant' to 'zombie'. 685 long wait_time = NmethodSweepCheckInterval * 1000; 686 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 687 // Only one thread at a time can do sweeping. Scale the 688 // wait time according to the number of compiler threads. 689 // As a result, the next sweep is likely to happen every 100ms 690 // with an arbitrary number of threads that do sweeping. 691 wait_time = 100 * CICompilerCount; 692 } 693 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 694 if (timeout) { 695 MutexUnlocker ul(lock()); 696 NMethodSweeper::possibly_sweep(); 697 } 698 } else { 699 // If there are no compilation tasks and we can compile new jobs 700 // (i.e., there is enough free space in the code cache) there is 701 // no need to invoke the sweeper. As a result, the hotness of methods 702 // remains unchanged. This behavior is desired, since we want to keep 703 // the stable state, i.e., we do not want to evict methods from the 704 // code cache if it is unnecessary. 705 // We need a timed wait here, since compiler threads can exit if compilation 706 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 707 // is not critical and we do not want idle compiler threads to wake up too often. 708 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 709 } 710 } 711 712 if (CompileBroker::is_compilation_disabled_forever()) { 713 return NULL; 714 } 715 716 CompileTask* task; 717 { 718 No_Safepoint_Verifier nsv; 719 task = CompilationPolicy::policy()->select_task(this); 720 } 721 remove(task); 722 purge_stale_tasks(); // may temporarily release MCQ lock 723 return task; 724 } 725 726 // Clean & deallocate stale compile tasks. 727 // Temporarily releases MethodCompileQueue lock. 728 void CompileQueue::purge_stale_tasks() { 729 assert(lock()->owned_by_self(), "must own lock"); 730 if (_first_stale != NULL) { 731 // Stale tasks are purged when MCQ lock is released, 732 // but _first_stale updates are protected by MCQ lock. 733 // Once task processing starts and MCQ lock is released, 734 // other compiler threads can reuse _first_stale. 735 CompileTask* head = _first_stale; 736 _first_stale = NULL; 737 { 738 MutexUnlocker ul(lock()); 739 for (CompileTask* task = head; task != NULL; ) { 740 CompileTask* next_task = task->next(); 741 CompileTaskWrapper ctw(task); // Frees the task 742 task->set_failure_reason("stale task"); 743 task = next_task; 744 } 745 } 746 } 747 } 748 749 void CompileQueue::remove(CompileTask* task) { 750 assert(lock()->owned_by_self(), "must own lock"); 751 if (task->prev() != NULL) { 752 task->prev()->set_next(task->next()); 753 } else { 754 // max is the first element 755 assert(task == _first, "Sanity"); 756 _first = task->next(); 757 } 758 759 if (task->next() != NULL) { 760 task->next()->set_prev(task->prev()); 761 } else { 762 // max is the last element 763 assert(task == _last, "Sanity"); 764 _last = task->prev(); 765 } 766 --_size; 767 } 768 769 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 770 assert(lock()->owned_by_self(), "must own lock"); 771 remove(task); 772 773 // Enqueue the task for reclamation (should be done outside MCQ lock) 774 task->set_next(_first_stale); 775 task->set_prev(NULL); 776 _first_stale = task; 777 } 778 779 // methods in the compile queue need to be marked as used on the stack 780 // so that they don't get reclaimed by Redefine Classes 781 void CompileQueue::mark_on_stack() { 782 CompileTask* task = _first; 783 while (task != NULL) { 784 task->mark_on_stack(); 785 task = task->next(); 786 } 787 } 788 789 #ifndef PRODUCT 790 /** 791 * Print entire compilation queue. 792 */ 793 void CompileQueue::print() { 794 if (CIPrintCompileQueue) { 795 ttyLocker ttyl; 796 tty->print_cr("Contents of %s", name()); 797 tty->print_cr("----------------------"); 798 CompileTask* task = _first; 799 while (task != NULL) { 800 task->print_line(); 801 task = task->next(); 802 } 803 tty->print_cr("----------------------"); 804 } 805 } 806 #endif // PRODUCT 807 808 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 809 810 _current_method[0] = '\0'; 811 _compile_type = CompileBroker::no_compile; 812 813 if (UsePerfData) { 814 ResourceMark rm; 815 816 // create the thread instance name space string - don't create an 817 // instance subspace if instance is -1 - keeps the adapterThread 818 // counters from having a ".0" namespace. 819 const char* thread_i = (instance == -1) ? thread_name : 820 PerfDataManager::name_space(thread_name, instance); 821 822 823 char* name = PerfDataManager::counter_name(thread_i, "method"); 824 _perf_current_method = 825 PerfDataManager::create_string_variable(SUN_CI, name, 826 cmname_buffer_length, 827 _current_method, CHECK); 828 829 name = PerfDataManager::counter_name(thread_i, "type"); 830 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 831 PerfData::U_None, 832 (jlong)_compile_type, 833 CHECK); 834 835 name = PerfDataManager::counter_name(thread_i, "time"); 836 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 837 PerfData::U_Ticks, CHECK); 838 839 name = PerfDataManager::counter_name(thread_i, "compiles"); 840 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 841 PerfData::U_Events, CHECK); 842 } 843 } 844 845 // ------------------------------------------------------------------ 846 // CompileBroker::compilation_init 847 // 848 // Initialize the Compilation object 849 void CompileBroker::compilation_init() { 850 _last_method_compiled[0] = '\0'; 851 852 // No need to initialize compilation system if we do not use it. 853 if (!UseCompiler) { 854 return; 855 } 856 #ifndef SHARK 857 // Set the interface to the current compiler(s). 858 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 859 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 860 #ifdef COMPILER1 861 if (c1_count > 0) { 862 _compilers[0] = new Compiler(); 863 } 864 #endif // COMPILER1 865 866 #ifdef COMPILER2 867 if (c2_count > 0) { 868 _compilers[1] = new C2Compiler(); 869 } 870 #endif // COMPILER2 871 872 #else // SHARK 873 int c1_count = 0; 874 int c2_count = 1; 875 876 _compilers[1] = new SharkCompiler(); 877 #endif // SHARK 878 879 // Start the CompilerThreads 880 init_compiler_threads(c1_count, c2_count); 881 // totalTime performance counter is always created as it is required 882 // by the implementation of java.lang.management.CompilationMBean. 883 { 884 EXCEPTION_MARK; 885 _perf_total_compilation = 886 PerfDataManager::create_counter(JAVA_CI, "totalTime", 887 PerfData::U_Ticks, CHECK); 888 } 889 890 891 if (UsePerfData) { 892 893 EXCEPTION_MARK; 894 895 // create the jvmstat performance counters 896 _perf_osr_compilation = 897 PerfDataManager::create_counter(SUN_CI, "osrTime", 898 PerfData::U_Ticks, CHECK); 899 900 _perf_standard_compilation = 901 PerfDataManager::create_counter(SUN_CI, "standardTime", 902 PerfData::U_Ticks, CHECK); 903 904 _perf_total_bailout_count = 905 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 906 PerfData::U_Events, CHECK); 907 908 _perf_total_invalidated_count = 909 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 910 PerfData::U_Events, CHECK); 911 912 _perf_total_compile_count = 913 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 914 PerfData::U_Events, CHECK); 915 _perf_total_osr_compile_count = 916 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 917 PerfData::U_Events, CHECK); 918 919 _perf_total_standard_compile_count = 920 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 921 PerfData::U_Events, CHECK); 922 923 _perf_sum_osr_bytes_compiled = 924 PerfDataManager::create_counter(SUN_CI, "osrBytes", 925 PerfData::U_Bytes, CHECK); 926 927 _perf_sum_standard_bytes_compiled = 928 PerfDataManager::create_counter(SUN_CI, "standardBytes", 929 PerfData::U_Bytes, CHECK); 930 931 _perf_sum_nmethod_size = 932 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 933 PerfData::U_Bytes, CHECK); 934 935 _perf_sum_nmethod_code_size = 936 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 937 PerfData::U_Bytes, CHECK); 938 939 _perf_last_method = 940 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 941 CompilerCounters::cmname_buffer_length, 942 "", CHECK); 943 944 _perf_last_failed_method = 945 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 946 CompilerCounters::cmname_buffer_length, 947 "", CHECK); 948 949 _perf_last_invalidated_method = 950 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 951 CompilerCounters::cmname_buffer_length, 952 "", CHECK); 953 954 _perf_last_compile_type = 955 PerfDataManager::create_variable(SUN_CI, "lastType", 956 PerfData::U_None, 957 (jlong)CompileBroker::no_compile, 958 CHECK); 959 960 _perf_last_compile_size = 961 PerfDataManager::create_variable(SUN_CI, "lastSize", 962 PerfData::U_Bytes, 963 (jlong)CompileBroker::no_compile, 964 CHECK); 965 966 967 _perf_last_failed_type = 968 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 969 PerfData::U_None, 970 (jlong)CompileBroker::no_compile, 971 CHECK); 972 973 _perf_last_invalidated_type = 974 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 975 PerfData::U_None, 976 (jlong)CompileBroker::no_compile, 977 CHECK); 978 } 979 980 _initialized = true; 981 } 982 983 984 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 985 AbstractCompiler* comp, TRAPS) { 986 CompilerThread* compiler_thread = NULL; 987 988 Klass* k = 989 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 990 true, CHECK_0); 991 instanceKlassHandle klass (THREAD, k); 992 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 993 Handle string = java_lang_String::create_from_str(name, CHECK_0); 994 995 // Initialize thread_oop to put it into the system threadGroup 996 Handle thread_group (THREAD, Universe::system_thread_group()); 997 JavaValue result(T_VOID); 998 JavaCalls::call_special(&result, thread_oop, 999 klass, 1000 vmSymbols::object_initializer_name(), 1001 vmSymbols::threadgroup_string_void_signature(), 1002 thread_group, 1003 string, 1004 CHECK_0); 1005 1006 { 1007 MutexLocker mu(Threads_lock, THREAD); 1008 compiler_thread = new CompilerThread(queue, counters); 1009 // At this point the new CompilerThread data-races with this startup 1010 // thread (which I believe is the primoridal thread and NOT the VM 1011 // thread). This means Java bytecodes being executed at startup can 1012 // queue compile jobs which will run at whatever default priority the 1013 // newly created CompilerThread runs at. 1014 1015 1016 // At this point it may be possible that no osthread was created for the 1017 // JavaThread due to lack of memory. We would have to throw an exception 1018 // in that case. However, since this must work and we do not allow 1019 // exceptions anyway, check and abort if this fails. 1020 1021 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 1022 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1023 os::native_thread_creation_failed_msg()); 1024 } 1025 1026 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 1027 1028 // Note that this only sets the JavaThread _priority field, which by 1029 // definition is limited to Java priorities and not OS priorities. 1030 // The os-priority is set in the CompilerThread startup code itself 1031 1032 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1033 1034 // Note that we cannot call os::set_priority because it expects Java 1035 // priorities and we are *explicitly* using OS priorities so that it's 1036 // possible to set the compiler thread priority higher than any Java 1037 // thread. 1038 1039 int native_prio = CompilerThreadPriority; 1040 if (native_prio == -1) { 1041 if (UseCriticalCompilerThreadPriority) { 1042 native_prio = os::java_to_os_priority[CriticalPriority]; 1043 } else { 1044 native_prio = os::java_to_os_priority[NearMaxPriority]; 1045 } 1046 } 1047 os::set_native_priority(compiler_thread, native_prio); 1048 1049 java_lang_Thread::set_daemon(thread_oop()); 1050 1051 compiler_thread->set_threadObj(thread_oop()); 1052 compiler_thread->set_compiler(comp); 1053 Threads::add(compiler_thread); 1054 Thread::start(compiler_thread); 1055 } 1056 1057 // Let go of Threads_lock before yielding 1058 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1059 1060 return compiler_thread; 1061 } 1062 1063 1064 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 1065 EXCEPTION_MARK; 1066 #if !defined(ZERO) && !defined(SHARK) 1067 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1068 #endif // !ZERO && !SHARK 1069 // Initialize the compilation queue 1070 if (c2_compiler_count > 0) { 1071 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock); 1072 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1073 } 1074 if (c1_compiler_count > 0) { 1075 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock); 1076 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1077 } 1078 1079 int compiler_count = c1_compiler_count + c2_compiler_count; 1080 1081 _compiler_threads = 1082 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1083 1084 char name_buffer[256]; 1085 for (int i = 0; i < c2_compiler_count; i++) { 1086 // Create a name for our thread. 1087 sprintf(name_buffer, "C2 CompilerThread%d", i); 1088 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1089 // Shark and C2 1090 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK); 1091 _compiler_threads->append(new_thread); 1092 } 1093 1094 for (int i = c2_compiler_count; i < compiler_count; i++) { 1095 // Create a name for our thread. 1096 sprintf(name_buffer, "C1 CompilerThread%d", i); 1097 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1098 // C1 1099 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK); 1100 _compiler_threads->append(new_thread); 1101 } 1102 1103 if (UsePerfData) { 1104 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1105 } 1106 } 1107 1108 1109 /** 1110 * Set the methods on the stack as on_stack so that redefine classes doesn't 1111 * reclaim them. This method is executed at a safepoint. 1112 */ 1113 void CompileBroker::mark_on_stack() { 1114 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1115 // Since we are at a safepoint, we do not need a lock to access 1116 // the compile queues. 1117 if (_c2_compile_queue != NULL) { 1118 _c2_compile_queue->mark_on_stack(); 1119 } 1120 if (_c1_compile_queue != NULL) { 1121 _c1_compile_queue->mark_on_stack(); 1122 } 1123 } 1124 1125 // ------------------------------------------------------------------ 1126 // CompileBroker::compile_method 1127 // 1128 // Request compilation of a method. 1129 void CompileBroker::compile_method_base(methodHandle method, 1130 int osr_bci, 1131 int comp_level, 1132 methodHandle hot_method, 1133 int hot_count, 1134 const char* comment, 1135 Thread* thread) { 1136 // do nothing if compiler thread(s) is not available 1137 if (!_initialized) { 1138 return; 1139 } 1140 1141 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1142 assert(method->method_holder()->oop_is_instance(), 1143 "sanity check"); 1144 assert(!method->method_holder()->is_not_initialized(), 1145 "method holder must be initialized"); 1146 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1147 1148 if (CIPrintRequests) { 1149 tty->print("request: "); 1150 method->print_short_name(tty); 1151 if (osr_bci != InvocationEntryBci) { 1152 tty->print(" osr_bci: %d", osr_bci); 1153 } 1154 tty->print(" comment: %s count: %d", comment, hot_count); 1155 if (!hot_method.is_null()) { 1156 tty->print(" hot: "); 1157 if (hot_method() != method()) { 1158 hot_method->print_short_name(tty); 1159 } else { 1160 tty->print("yes"); 1161 } 1162 } 1163 tty->cr(); 1164 } 1165 1166 // A request has been made for compilation. Before we do any 1167 // real work, check to see if the method has been compiled 1168 // in the meantime with a definitive result. 1169 if (compilation_is_complete(method, osr_bci, comp_level)) { 1170 return; 1171 } 1172 1173 #ifndef PRODUCT 1174 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1175 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1176 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1177 return; 1178 } 1179 } 1180 #endif 1181 1182 // If this method is already in the compile queue, then 1183 // we do not block the current thread. 1184 if (compilation_is_in_queue(method)) { 1185 // We may want to decay our counter a bit here to prevent 1186 // multiple denied requests for compilation. This is an 1187 // open compilation policy issue. Note: The other possibility, 1188 // in the case that this is a blocking compile request, is to have 1189 // all subsequent blocking requesters wait for completion of 1190 // ongoing compiles. Note that in this case we'll need a protocol 1191 // for freeing the associated compile tasks. [Or we could have 1192 // a single static monitor on which all these waiters sleep.] 1193 return; 1194 } 1195 1196 // If the requesting thread is holding the pending list lock 1197 // then we just return. We can't risk blocking while holding 1198 // the pending list lock or a 3-way deadlock may occur 1199 // between the reference handler thread, a GC (instigated 1200 // by a compiler thread), and compiled method registration. 1201 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1202 return; 1203 } 1204 1205 // Outputs from the following MutexLocker block: 1206 CompileTask* task = NULL; 1207 bool blocking = false; 1208 CompileQueue* queue = compile_queue(comp_level); 1209 1210 // Acquire our lock. 1211 { 1212 MutexLocker locker(queue->lock(), thread); 1213 1214 // Make sure the method has not slipped into the queues since 1215 // last we checked; note that those checks were "fast bail-outs". 1216 // Here we need to be more careful, see 14012000 below. 1217 if (compilation_is_in_queue(method)) { 1218 return; 1219 } 1220 1221 // We need to check again to see if the compilation has 1222 // completed. A previous compilation may have registered 1223 // some result. 1224 if (compilation_is_complete(method, osr_bci, comp_level)) { 1225 return; 1226 } 1227 1228 // We now know that this compilation is not pending, complete, 1229 // or prohibited. Assign a compile_id to this compilation 1230 // and check to see if it is in our [Start..Stop) range. 1231 int compile_id = assign_compile_id(method, osr_bci); 1232 if (compile_id == 0) { 1233 // The compilation falls outside the allowed range. 1234 return; 1235 } 1236 1237 // Should this thread wait for completion of the compile? 1238 blocking = is_compile_blocking(); 1239 1240 // We will enter the compilation in the queue. 1241 // 14012000: Note that this sets the queued_for_compile bits in 1242 // the target method. We can now reason that a method cannot be 1243 // queued for compilation more than once, as follows: 1244 // Before a thread queues a task for compilation, it first acquires 1245 // the compile queue lock, then checks if the method's queued bits 1246 // are set or it has already been compiled. Thus there can not be two 1247 // instances of a compilation task for the same method on the 1248 // compilation queue. Consider now the case where the compilation 1249 // thread has already removed a task for that method from the queue 1250 // and is in the midst of compiling it. In this case, the 1251 // queued_for_compile bits must be set in the method (and these 1252 // will be visible to the current thread, since the bits were set 1253 // under protection of the compile queue lock, which we hold now. 1254 // When the compilation completes, the compiler thread first sets 1255 // the compilation result and then clears the queued_for_compile 1256 // bits. Neither of these actions are protected by a barrier (or done 1257 // under the protection of a lock), so the only guarantee we have 1258 // (on machines with TSO (Total Store Order)) is that these values 1259 // will update in that order. As a result, the only combinations of 1260 // these bits that the current thread will see are, in temporal order: 1261 // <RESULT, QUEUE> : 1262 // <0, 1> : in compile queue, but not yet compiled 1263 // <1, 1> : compiled but queue bit not cleared 1264 // <1, 0> : compiled and queue bit cleared 1265 // Because we first check the queue bits then check the result bits, 1266 // we are assured that we cannot introduce a duplicate task. 1267 // Note that if we did the tests in the reverse order (i.e. check 1268 // result then check queued bit), we could get the result bit before 1269 // the compilation completed, and the queue bit after the compilation 1270 // completed, and end up introducing a "duplicate" (redundant) task. 1271 // In that case, the compiler thread should first check if a method 1272 // has already been compiled before trying to compile it. 1273 // NOTE: in the event that there are multiple compiler threads and 1274 // there is de-optimization/recompilation, things will get hairy, 1275 // and in that case it's best to protect both the testing (here) of 1276 // these bits, and their updating (here and elsewhere) under a 1277 // common lock. 1278 task = create_compile_task(queue, 1279 compile_id, method, 1280 osr_bci, comp_level, 1281 hot_method, hot_count, comment, 1282 blocking); 1283 } 1284 1285 if (blocking) { 1286 wait_for_completion(task); 1287 } 1288 } 1289 1290 1291 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1292 int comp_level, 1293 methodHandle hot_method, int hot_count, 1294 const char* comment, Thread* THREAD) { 1295 // make sure arguments make sense 1296 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1297 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1298 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1299 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1300 // allow any levels for WhiteBox 1301 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1302 // return quickly if possible 1303 1304 // lock, make sure that the compilation 1305 // isn't prohibited in a straightforward way. 1306 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1307 if (comp == NULL || !comp->can_compile_method(method) || 1308 compilation_is_prohibited(method, osr_bci, comp_level)) { 1309 return NULL; 1310 } 1311 1312 if (osr_bci == InvocationEntryBci) { 1313 // standard compilation 1314 nmethod* method_code = method->code(); 1315 if (method_code != NULL) { 1316 if (compilation_is_complete(method, osr_bci, comp_level)) { 1317 return method_code; 1318 } 1319 } 1320 if (method->is_not_compilable(comp_level)) { 1321 return NULL; 1322 } 1323 } else { 1324 // osr compilation 1325 #ifndef TIERED 1326 // seems like an assert of dubious value 1327 assert(comp_level == CompLevel_highest_tier, 1328 "all OSR compiles are assumed to be at a single compilation lavel"); 1329 #endif // TIERED 1330 // We accept a higher level osr method 1331 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1332 if (nm != NULL) return nm; 1333 if (method->is_not_osr_compilable(comp_level)) return NULL; 1334 } 1335 1336 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1337 // some prerequisites that are compiler specific 1338 if (comp->is_c2() || comp->is_shark()) { 1339 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1340 // Resolve all classes seen in the signature of the method 1341 // we are compiling. 1342 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1343 } 1344 1345 // If the method is native, do the lookup in the thread requesting 1346 // the compilation. Native lookups can load code, which is not 1347 // permitted during compilation. 1348 // 1349 // Note: A native method implies non-osr compilation which is 1350 // checked with an assertion at the entry of this method. 1351 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1352 bool in_base_library; 1353 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1354 if (HAS_PENDING_EXCEPTION) { 1355 // In case of an exception looking up the method, we just forget 1356 // about it. The interpreter will kick-in and throw the exception. 1357 method->set_not_compilable(); // implies is_not_osr_compilable() 1358 CLEAR_PENDING_EXCEPTION; 1359 return NULL; 1360 } 1361 assert(method->has_native_function(), "must have native code by now"); 1362 } 1363 1364 // RedefineClasses() has replaced this method; just return 1365 if (method->is_old()) { 1366 return NULL; 1367 } 1368 1369 // JVMTI -- post_compile_event requires jmethod_id() that may require 1370 // a lock the compiling thread can not acquire. Prefetch it here. 1371 if (JvmtiExport::should_post_compiled_method_load()) { 1372 method->jmethod_id(); 1373 } 1374 1375 // do the compilation 1376 if (method->is_native()) { 1377 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1378 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1379 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1380 // 1381 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1382 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1383 AdapterHandlerLibrary::create_native_wrapper(method); 1384 } else { 1385 return NULL; 1386 } 1387 } else { 1388 // If the compiler is shut off due to code cache getting full 1389 // fail out now so blocking compiles dont hang the java thread 1390 if (!should_compile_new_jobs()) { 1391 CompilationPolicy::policy()->delay_compilation(method()); 1392 return NULL; 1393 } 1394 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1395 } 1396 1397 // return requested nmethod 1398 // We accept a higher level osr method 1399 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1400 } 1401 1402 1403 // ------------------------------------------------------------------ 1404 // CompileBroker::compilation_is_complete 1405 // 1406 // See if compilation of this method is already complete. 1407 bool CompileBroker::compilation_is_complete(methodHandle method, 1408 int osr_bci, 1409 int comp_level) { 1410 bool is_osr = (osr_bci != standard_entry_bci); 1411 if (is_osr) { 1412 if (method->is_not_osr_compilable(comp_level)) { 1413 return true; 1414 } else { 1415 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1416 return (result != NULL); 1417 } 1418 } else { 1419 if (method->is_not_compilable(comp_level)) { 1420 return true; 1421 } else { 1422 nmethod* result = method->code(); 1423 if (result == NULL) return false; 1424 return comp_level == result->comp_level(); 1425 } 1426 } 1427 } 1428 1429 1430 /** 1431 * See if this compilation is already requested. 1432 * 1433 * Implementation note: there is only a single "is in queue" bit 1434 * for each method. This means that the check below is overly 1435 * conservative in the sense that an osr compilation in the queue 1436 * will block a normal compilation from entering the queue (and vice 1437 * versa). This can be remedied by a full queue search to disambiguate 1438 * cases. If it is deemed profitable, this may be done. 1439 */ 1440 bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1441 return method->queued_for_compilation(); 1442 } 1443 1444 // ------------------------------------------------------------------ 1445 // CompileBroker::compilation_is_prohibited 1446 // 1447 // See if this compilation is not allowed. 1448 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1449 bool is_native = method->is_native(); 1450 // Some compilers may not support the compilation of natives. 1451 AbstractCompiler *comp = compiler(comp_level); 1452 if (is_native && 1453 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1454 method->set_not_compilable_quietly(comp_level); 1455 return true; 1456 } 1457 1458 bool is_osr = (osr_bci != standard_entry_bci); 1459 // Some compilers may not support on stack replacement. 1460 if (is_osr && 1461 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1462 method->set_not_osr_compilable(comp_level); 1463 return true; 1464 } 1465 1466 // The method may be explicitly excluded by the user. 1467 bool quietly; 1468 if (CompilerOracle::should_exclude(method, quietly)) { 1469 if (!quietly) { 1470 // This does not happen quietly... 1471 ResourceMark rm; 1472 tty->print("### Excluding %s:%s", 1473 method->is_native() ? "generation of native wrapper" : "compile", 1474 (method->is_static() ? " static" : "")); 1475 method->print_short_name(tty); 1476 tty->cr(); 1477 } 1478 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1479 } 1480 1481 return false; 1482 } 1483 1484 /** 1485 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1486 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1487 * The function also allows to generate separate compilation IDs for OSR compilations. 1488 */ 1489 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1490 #ifdef ASSERT 1491 bool is_osr = (osr_bci != standard_entry_bci); 1492 int id; 1493 if (method->is_native()) { 1494 assert(!is_osr, "can't be osr"); 1495 // Adapters, native wrappers and method handle intrinsics 1496 // should be generated always. 1497 return Atomic::add(1, &_compilation_id); 1498 } else if (CICountOSR && is_osr) { 1499 id = Atomic::add(1, &_osr_compilation_id); 1500 if (CIStartOSR <= id && id < CIStopOSR) { 1501 return id; 1502 } 1503 } else { 1504 id = Atomic::add(1, &_compilation_id); 1505 if (CIStart <= id && id < CIStop) { 1506 return id; 1507 } 1508 } 1509 1510 // Method was not in the appropriate compilation range. 1511 method->set_not_compilable_quietly(); 1512 return 0; 1513 #else 1514 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1515 // only _compilation_id is incremented. 1516 return Atomic::add(1, &_compilation_id); 1517 #endif 1518 } 1519 1520 /** 1521 * Should the current thread block until this compilation request 1522 * has been fulfilled? 1523 */ 1524 bool CompileBroker::is_compile_blocking() { 1525 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1526 return !BackgroundCompilation; 1527 } 1528 1529 1530 // ------------------------------------------------------------------ 1531 // CompileBroker::preload_classes 1532 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1533 // Move this code over from c1_Compiler.cpp 1534 ShouldNotReachHere(); 1535 } 1536 1537 1538 // ------------------------------------------------------------------ 1539 // CompileBroker::create_compile_task 1540 // 1541 // Create a CompileTask object representing the current request for 1542 // compilation. Add this task to the queue. 1543 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1544 int compile_id, 1545 methodHandle method, 1546 int osr_bci, 1547 int comp_level, 1548 methodHandle hot_method, 1549 int hot_count, 1550 const char* comment, 1551 bool blocking) { 1552 CompileTask* new_task = CompileTask::allocate(); 1553 new_task->initialize(compile_id, method, osr_bci, comp_level, 1554 hot_method, hot_count, comment, 1555 blocking); 1556 queue->add(new_task); 1557 return new_task; 1558 } 1559 1560 1561 /** 1562 * Wait for the compilation task to complete. 1563 */ 1564 void CompileBroker::wait_for_completion(CompileTask* task) { 1565 if (CIPrintCompileQueue) { 1566 ttyLocker ttyl; 1567 tty->print_cr("BLOCKING FOR COMPILE"); 1568 } 1569 1570 assert(task->is_blocking(), "can only wait on blocking task"); 1571 1572 JavaThread* thread = JavaThread::current(); 1573 thread->set_blocked_on_compilation(true); 1574 1575 methodHandle method(thread, task->method()); 1576 { 1577 MutexLocker waiter(task->lock(), thread); 1578 1579 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1580 task->lock()->wait(); 1581 } 1582 } 1583 1584 thread->set_blocked_on_compilation(false); 1585 if (is_compilation_disabled_forever()) { 1586 CompileTask::free(task); 1587 return; 1588 } 1589 1590 // It is harmless to check this status without the lock, because 1591 // completion is a stable property (until the task object is recycled). 1592 assert(task->is_complete(), "Compilation should have completed"); 1593 assert(task->code_handle() == NULL, "must be reset"); 1594 1595 // By convention, the waiter is responsible for recycling a 1596 // blocking CompileTask. Since there is only one waiter ever 1597 // waiting on a CompileTask, we know that no one else will 1598 // be using this CompileTask; we can free it. 1599 CompileTask::free(task); 1600 } 1601 1602 /** 1603 * Initialize compiler thread(s) + compiler object(s). The postcondition 1604 * of this function is that the compiler runtimes are initialized and that 1605 * compiler threads can start compiling. 1606 */ 1607 bool CompileBroker::init_compiler_runtime() { 1608 CompilerThread* thread = CompilerThread::current(); 1609 AbstractCompiler* comp = thread->compiler(); 1610 // Final sanity check - the compiler object must exist 1611 guarantee(comp != NULL, "Compiler object must exist"); 1612 1613 int system_dictionary_modification_counter; 1614 { 1615 MutexLocker locker(Compile_lock, thread); 1616 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1617 } 1618 1619 { 1620 // Must switch to native to allocate ci_env 1621 ThreadToNativeFromVM ttn(thread); 1622 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1623 // Cache Jvmti state 1624 ci_env.cache_jvmti_state(); 1625 // Cache DTrace flags 1626 ci_env.cache_dtrace_flags(); 1627 1628 // Switch back to VM state to do compiler initialization 1629 ThreadInVMfromNative tv(thread); 1630 ResetNoHandleMark rnhm; 1631 1632 1633 if (!comp->is_shark()) { 1634 // Perform per-thread and global initializations 1635 comp->initialize(); 1636 } 1637 } 1638 1639 if (comp->is_failed()) { 1640 disable_compilation_forever(); 1641 // If compiler initialization failed, no compiler thread that is specific to a 1642 // particular compiler runtime will ever start to compile methods. 1643 shutdown_compiler_runtime(comp, thread); 1644 return false; 1645 } 1646 1647 // C1 specific check 1648 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1649 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1650 return false; 1651 } 1652 1653 return true; 1654 } 1655 1656 /** 1657 * If C1 and/or C2 initialization failed, we shut down all compilation. 1658 * We do this to keep things simple. This can be changed if it ever turns 1659 * out to be a problem. 1660 */ 1661 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1662 // Free buffer blob, if allocated 1663 if (thread->get_buffer_blob() != NULL) { 1664 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1665 CodeCache::free(thread->get_buffer_blob()); 1666 } 1667 1668 if (comp->should_perform_shutdown()) { 1669 // There are two reasons for shutting down the compiler 1670 // 1) compiler runtime initialization failed 1671 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1672 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1673 1674 // Only one thread per compiler runtime object enters here 1675 // Set state to shut down 1676 comp->set_shut_down(); 1677 1678 // Delete all queued compilation tasks to make compiler threads exit faster. 1679 if (_c1_compile_queue != NULL) { 1680 _c1_compile_queue->free_all(); 1681 } 1682 1683 if (_c2_compile_queue != NULL) { 1684 _c2_compile_queue->free_all(); 1685 } 1686 1687 // Set flags so that we continue execution with using interpreter only. 1688 UseCompiler = false; 1689 UseInterpreter = true; 1690 1691 // We could delete compiler runtimes also. However, there are references to 1692 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1693 // fail. This can be done later if necessary. 1694 } 1695 } 1696 1697 // ------------------------------------------------------------------ 1698 // CompileBroker::compiler_thread_loop 1699 // 1700 // The main loop run by a CompilerThread. 1701 void CompileBroker::compiler_thread_loop() { 1702 CompilerThread* thread = CompilerThread::current(); 1703 CompileQueue* queue = thread->queue(); 1704 // For the thread that initializes the ciObjectFactory 1705 // this resource mark holds all the shared objects 1706 ResourceMark rm; 1707 1708 // First thread to get here will initialize the compiler interface 1709 1710 if (!ciObjectFactory::is_initialized()) { 1711 ASSERT_IN_VM; 1712 MutexLocker only_one (CompileThread_lock, thread); 1713 if (!ciObjectFactory::is_initialized()) { 1714 ciObjectFactory::initialize(); 1715 } 1716 } 1717 1718 // Open a log. 1719 if (LogCompilation) { 1720 init_compiler_thread_log(); 1721 } 1722 CompileLog* log = thread->log(); 1723 if (log != NULL) { 1724 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1725 thread->name(), 1726 os::current_thread_id(), 1727 os::current_process_id()); 1728 log->stamp(); 1729 log->end_elem(); 1730 } 1731 1732 // If compiler thread/runtime initialization fails, exit the compiler thread 1733 if (!init_compiler_runtime()) { 1734 return; 1735 } 1736 1737 // Poll for new compilation tasks as long as the JVM runs. Compilation 1738 // should only be disabled if something went wrong while initializing the 1739 // compiler runtimes. This, in turn, should not happen. The only known case 1740 // when compiler runtime initialization fails is if there is not enough free 1741 // space in the code cache to generate the necessary stubs, etc. 1742 while (!is_compilation_disabled_forever()) { 1743 // We need this HandleMark to avoid leaking VM handles. 1744 HandleMark hm(thread); 1745 1746 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1747 // the code cache is really full 1748 handle_full_code_cache(); 1749 } 1750 1751 CompileTask* task = queue->get(); 1752 if (task == NULL) { 1753 continue; 1754 } 1755 1756 // Give compiler threads an extra quanta. They tend to be bursty and 1757 // this helps the compiler to finish up the job. 1758 if( CompilerThreadHintNoPreempt ) 1759 os::hint_no_preempt(); 1760 1761 // trace per thread time and compile statistics 1762 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1763 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1764 1765 // Assign the task to the current thread. Mark this compilation 1766 // thread as active for the profiler. 1767 CompileTaskWrapper ctw(task); 1768 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1769 task->set_code_handle(&result_handle); 1770 methodHandle method(thread, task->method()); 1771 1772 // Never compile a method if breakpoints are present in it 1773 if (method()->number_of_breakpoints() == 0) { 1774 // Compile the method. 1775 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1776 #ifdef COMPILER1 1777 // Allow repeating compilations for the purpose of benchmarking 1778 // compile speed. This is not useful for customers. 1779 if (CompilationRepeat != 0) { 1780 int compile_count = CompilationRepeat; 1781 while (compile_count > 0) { 1782 invoke_compiler_on_method(task); 1783 nmethod* nm = method->code(); 1784 if (nm != NULL) { 1785 nm->make_zombie(); 1786 method->clear_code(); 1787 } 1788 compile_count--; 1789 } 1790 } 1791 #endif /* COMPILER1 */ 1792 invoke_compiler_on_method(task); 1793 } else { 1794 // After compilation is disabled, remove remaining methods from queue 1795 method->clear_queued_for_compilation(); 1796 task->set_failure_reason("compilation is disabled"); 1797 } 1798 } 1799 } 1800 1801 // Shut down compiler runtime 1802 shutdown_compiler_runtime(thread->compiler(), thread); 1803 } 1804 1805 // ------------------------------------------------------------------ 1806 // CompileBroker::init_compiler_thread_log 1807 // 1808 // Set up state required by +LogCompilation. 1809 void CompileBroker::init_compiler_thread_log() { 1810 CompilerThread* thread = CompilerThread::current(); 1811 char file_name[4*K]; 1812 FILE* fp = NULL; 1813 intx thread_id = os::current_thread_id(); 1814 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1815 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1816 if (dir == NULL) { 1817 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1818 thread_id, os::current_process_id()); 1819 } else { 1820 jio_snprintf(file_name, sizeof(file_name), 1821 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1822 os::file_separator(), thread_id, os::current_process_id()); 1823 } 1824 1825 fp = fopen(file_name, "at"); 1826 if (fp != NULL) { 1827 if (LogCompilation && Verbose) { 1828 tty->print_cr("Opening compilation log %s", file_name); 1829 } 1830 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1831 thread->init_log(log); 1832 1833 if (xtty != NULL) { 1834 ttyLocker ttyl; 1835 // Record any per thread log files 1836 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1837 } 1838 return; 1839 } 1840 } 1841 warning("Cannot open log file: %s", file_name); 1842 } 1843 1844 // ------------------------------------------------------------------ 1845 // CompileBroker::set_should_block 1846 // 1847 // Set _should_block. 1848 // Call this from the VM, with Threads_lock held and a safepoint requested. 1849 void CompileBroker::set_should_block() { 1850 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1851 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1852 #ifndef PRODUCT 1853 if (PrintCompilation && (Verbose || WizardMode)) 1854 tty->print_cr("notifying compiler thread pool to block"); 1855 #endif 1856 _should_block = true; 1857 } 1858 1859 // ------------------------------------------------------------------ 1860 // CompileBroker::maybe_block 1861 // 1862 // Call this from the compiler at convenient points, to poll for _should_block. 1863 void CompileBroker::maybe_block() { 1864 if (_should_block) { 1865 #ifndef PRODUCT 1866 if (PrintCompilation && (Verbose || WizardMode)) 1867 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1868 #endif 1869 ThreadInVMfromNative tivfn(JavaThread::current()); 1870 } 1871 } 1872 1873 // wrapper for CodeCache::print_summary() 1874 static void codecache_print(bool detailed) 1875 { 1876 ResourceMark rm; 1877 stringStream s; 1878 // Dump code cache into a buffer before locking the tty, 1879 { 1880 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1881 CodeCache::print_summary(&s, detailed); 1882 } 1883 ttyLocker ttyl; 1884 tty->print("%s", s.as_string()); 1885 } 1886 1887 // ------------------------------------------------------------------ 1888 // CompileBroker::invoke_compiler_on_method 1889 // 1890 // Compile a method. 1891 // 1892 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1893 if (PrintCompilation) { 1894 ResourceMark rm; 1895 task->print_line(); 1896 } 1897 elapsedTimer time; 1898 1899 CompilerThread* thread = CompilerThread::current(); 1900 ResourceMark rm(thread); 1901 1902 if (LogEvents) { 1903 _compilation_log->log_compile(thread, task); 1904 } 1905 1906 // Common flags. 1907 uint compile_id = task->compile_id(); 1908 int osr_bci = task->osr_bci(); 1909 bool is_osr = (osr_bci != standard_entry_bci); 1910 bool should_log = (thread->log() != NULL); 1911 bool should_break = false; 1912 int task_level = task->comp_level(); 1913 { 1914 // create the handle inside it's own block so it can't 1915 // accidentally be referenced once the thread transitions to 1916 // native. The NoHandleMark before the transition should catch 1917 // any cases where this occurs in the future. 1918 methodHandle method(thread, task->method()); 1919 should_break = check_break_at(method, compile_id, is_osr); 1920 if (should_log && !CompilerOracle::should_log(method)) { 1921 should_log = false; 1922 } 1923 assert(!method->is_native(), "no longer compile natives"); 1924 1925 // Save information about this method in case of failure. 1926 set_last_compile(thread, method, is_osr, task_level); 1927 1928 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1929 } 1930 1931 // Allocate a new set of JNI handles. 1932 push_jni_handle_block(); 1933 Method* target_handle = task->method(); 1934 int compilable = ciEnv::MethodCompilable; 1935 { 1936 int system_dictionary_modification_counter; 1937 { 1938 MutexLocker locker(Compile_lock, thread); 1939 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1940 } 1941 1942 NoHandleMark nhm; 1943 ThreadToNativeFromVM ttn(thread); 1944 1945 ciEnv ci_env(task, system_dictionary_modification_counter); 1946 if (should_break) { 1947 ci_env.set_break_at_compile(true); 1948 } 1949 if (should_log) { 1950 ci_env.set_log(thread->log()); 1951 } 1952 assert(thread->env() == &ci_env, "set by ci_env"); 1953 // The thread-env() field is cleared in ~CompileTaskWrapper. 1954 1955 // Cache Jvmti state 1956 ci_env.cache_jvmti_state(); 1957 1958 // Cache DTrace flags 1959 ci_env.cache_dtrace_flags(); 1960 1961 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1962 1963 TraceTime t1("compilation", &time); 1964 EventCompilation event; 1965 1966 AbstractCompiler *comp = compiler(task_level); 1967 if (comp == NULL) { 1968 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1969 } else { 1970 comp->compile_method(&ci_env, target, osr_bci); 1971 } 1972 1973 if (!ci_env.failing() && task->code() == NULL) { 1974 //assert(false, "compiler should always document failure"); 1975 // The compiler elected, without comment, not to register a result. 1976 // Do not attempt further compilations of this method. 1977 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1978 } 1979 1980 // Copy this bit to the enclosing block: 1981 compilable = ci_env.compilable(); 1982 1983 if (ci_env.failing()) { 1984 task->set_failure_reason(ci_env.failure_reason()); 1985 const char* retry_message = ci_env.retry_message(); 1986 if (_compilation_log != NULL) { 1987 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1988 } 1989 if (PrintCompilation) { 1990 FormatBufferResource msg = retry_message != NULL ? 1991 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1992 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1993 task->print_compilation(tty, msg); 1994 } 1995 } else { 1996 task->mark_success(); 1997 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 1998 if (_compilation_log != NULL) { 1999 nmethod* code = task->code(); 2000 if (code != NULL) { 2001 _compilation_log->log_nmethod(thread, code); 2002 } 2003 } 2004 } 2005 // simulate crash during compilation 2006 assert(task->compile_id() != CICrashAt, "just as planned"); 2007 if (event.should_commit()) { 2008 event.set_method(target->get_Method()); 2009 event.set_compileID(compile_id); 2010 event.set_compileLevel(task->comp_level()); 2011 event.set_succeded(task->is_success()); 2012 event.set_isOsr(is_osr); 2013 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 2014 event.set_inlinedBytes(task->num_inlined_bytecodes()); 2015 event.commit(); 2016 } 2017 } 2018 pop_jni_handle_block(); 2019 2020 methodHandle method(thread, task->method()); 2021 2022 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2023 2024 collect_statistics(thread, time, task); 2025 2026 if (PrintCompilation && PrintCompilation2) { 2027 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2028 tty->print("%4d ", compile_id); // print compilation number 2029 tty->print("%s ", (is_osr ? "%" : " ")); 2030 if (task->code() != NULL) { 2031 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2032 } 2033 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2034 } 2035 2036 if (PrintCodeCacheOnCompilation) 2037 codecache_print(/* detailed= */ false); 2038 2039 // Disable compilation, if required. 2040 switch (compilable) { 2041 case ciEnv::MethodCompilable_never: 2042 if (is_osr) 2043 method->set_not_osr_compilable_quietly(); 2044 else 2045 method->set_not_compilable_quietly(); 2046 break; 2047 case ciEnv::MethodCompilable_not_at_tier: 2048 if (is_osr) 2049 method->set_not_osr_compilable_quietly(task_level); 2050 else 2051 method->set_not_compilable_quietly(task_level); 2052 break; 2053 } 2054 2055 // Note that the queued_for_compilation bits are cleared without 2056 // protection of a mutex. [They were set by the requester thread, 2057 // when adding the task to the compile queue -- at which time the 2058 // compile queue lock was held. Subsequently, we acquired the compile 2059 // queue lock to get this task off the compile queue; thus (to belabour 2060 // the point somewhat) our clearing of the bits must be occurring 2061 // only after the setting of the bits. See also 14012000 above. 2062 method->clear_queued_for_compilation(); 2063 2064 #ifdef ASSERT 2065 if (CollectedHeap::fired_fake_oom()) { 2066 // The current compile received a fake OOM during compilation so 2067 // go ahead and exit the VM since the test apparently succeeded 2068 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2069 vm_exit(0); 2070 } 2071 #endif 2072 } 2073 2074 /** 2075 * The CodeCache is full. Print out warning and disable compilation 2076 * or try code cache cleaning so compilation can continue later. 2077 */ 2078 void CompileBroker::handle_full_code_cache() { 2079 UseInterpreter = true; 2080 if (UseCompiler || AlwaysCompileLoopMethods ) { 2081 if (xtty != NULL) { 2082 ResourceMark rm; 2083 stringStream s; 2084 // Dump code cache state into a buffer before locking the tty, 2085 // because log_state() will use locks causing lock conflicts. 2086 CodeCache::log_state(&s); 2087 // Lock to prevent tearing 2088 ttyLocker ttyl; 2089 xtty->begin_elem("code_cache_full"); 2090 xtty->print("%s", s.as_string()); 2091 xtty->stamp(); 2092 xtty->end_elem(); 2093 } 2094 2095 CodeCache::report_codemem_full(); 2096 2097 #ifndef PRODUCT 2098 if (CompileTheWorld || ExitOnFullCodeCache) { 2099 codecache_print(/* detailed= */ true); 2100 before_exit(JavaThread::current()); 2101 exit_globals(); // will delete tty 2102 vm_direct_exit(CompileTheWorld ? 0 : 1); 2103 } 2104 #endif 2105 if (UseCodeCacheFlushing) { 2106 // Since code cache is full, immediately stop new compiles 2107 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2108 NMethodSweeper::log_sweep("disable_compiler"); 2109 } 2110 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2111 // without having to consider the state in which the current thread is. 2112 ThreadInVMfromUnknown in_vm; 2113 NMethodSweeper::possibly_sweep(); 2114 } else { 2115 disable_compilation_forever(); 2116 } 2117 2118 // Print warning only once 2119 if (should_print_compiler_warning()) { 2120 warning("CodeCache is full. Compiler has been disabled."); 2121 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2122 codecache_print(/* detailed= */ true); 2123 } 2124 } 2125 } 2126 2127 // ------------------------------------------------------------------ 2128 // CompileBroker::set_last_compile 2129 // 2130 // Record this compilation for debugging purposes. 2131 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2132 ResourceMark rm; 2133 char* method_name = method->name()->as_C_string(); 2134 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2135 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2136 char current_method[CompilerCounters::cmname_buffer_length]; 2137 size_t maxLen = CompilerCounters::cmname_buffer_length; 2138 2139 if (UsePerfData) { 2140 const char* class_name = method->method_holder()->name()->as_C_string(); 2141 2142 size_t s1len = strlen(class_name); 2143 size_t s2len = strlen(method_name); 2144 2145 // check if we need to truncate the string 2146 if (s1len + s2len + 2 > maxLen) { 2147 2148 // the strategy is to lop off the leading characters of the 2149 // class name and the trailing characters of the method name. 2150 2151 if (s2len + 2 > maxLen) { 2152 // lop of the entire class name string, let snprintf handle 2153 // truncation of the method name. 2154 class_name += s1len; // null string 2155 } 2156 else { 2157 // lop off the extra characters from the front of the class name 2158 class_name += ((s1len + s2len + 2) - maxLen); 2159 } 2160 } 2161 2162 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2163 } 2164 2165 if (CICountOSR && is_osr) { 2166 _last_compile_type = osr_compile; 2167 } else { 2168 _last_compile_type = normal_compile; 2169 } 2170 _last_compile_level = comp_level; 2171 2172 if (UsePerfData) { 2173 CompilerCounters* counters = thread->counters(); 2174 counters->set_current_method(current_method); 2175 counters->set_compile_type((jlong)_last_compile_type); 2176 } 2177 } 2178 2179 2180 // ------------------------------------------------------------------ 2181 // CompileBroker::push_jni_handle_block 2182 // 2183 // Push on a new block of JNI handles. 2184 void CompileBroker::push_jni_handle_block() { 2185 JavaThread* thread = JavaThread::current(); 2186 2187 // Allocate a new block for JNI handles. 2188 // Inlined code from jni_PushLocalFrame() 2189 JNIHandleBlock* java_handles = thread->active_handles(); 2190 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2191 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2192 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2193 thread->set_active_handles(compile_handles); 2194 } 2195 2196 2197 // ------------------------------------------------------------------ 2198 // CompileBroker::pop_jni_handle_block 2199 // 2200 // Pop off the current block of JNI handles. 2201 void CompileBroker::pop_jni_handle_block() { 2202 JavaThread* thread = JavaThread::current(); 2203 2204 // Release our JNI handle block 2205 JNIHandleBlock* compile_handles = thread->active_handles(); 2206 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2207 thread->set_active_handles(java_handles); 2208 compile_handles->set_pop_frame_link(NULL); 2209 JNIHandleBlock::release_block(compile_handles, thread); // may block 2210 } 2211 2212 2213 // ------------------------------------------------------------------ 2214 // CompileBroker::check_break_at 2215 // 2216 // Should the compilation break at the current compilation. 2217 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2218 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2219 return true; 2220 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2221 return true; 2222 } else { 2223 return (compile_id == CIBreakAt); 2224 } 2225 } 2226 2227 // ------------------------------------------------------------------ 2228 // CompileBroker::collect_statistics 2229 // 2230 // Collect statistics about the compilation. 2231 2232 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2233 bool success = task->is_success(); 2234 methodHandle method (thread, task->method()); 2235 uint compile_id = task->compile_id(); 2236 bool is_osr = (task->osr_bci() != standard_entry_bci); 2237 nmethod* code = task->code(); 2238 CompilerCounters* counters = thread->counters(); 2239 2240 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2241 MutexLocker locker(CompileStatistics_lock); 2242 2243 // _perf variables are production performance counters which are 2244 // updated regardless of the setting of the CITime and CITimeEach flags 2245 // 2246 if (!success) { 2247 _total_bailout_count++; 2248 if (UsePerfData) { 2249 _perf_last_failed_method->set_value(counters->current_method()); 2250 _perf_last_failed_type->set_value(counters->compile_type()); 2251 _perf_total_bailout_count->inc(); 2252 } 2253 } else if (code == NULL) { 2254 if (UsePerfData) { 2255 _perf_last_invalidated_method->set_value(counters->current_method()); 2256 _perf_last_invalidated_type->set_value(counters->compile_type()); 2257 _perf_total_invalidated_count->inc(); 2258 } 2259 _total_invalidated_count++; 2260 } else { 2261 // Compilation succeeded 2262 2263 // update compilation ticks - used by the implementation of 2264 // java.lang.management.CompilationMBean 2265 _perf_total_compilation->inc(time.ticks()); 2266 2267 _t_total_compilation.add(time); 2268 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2269 2270 if (CITime) { 2271 if (is_osr) { 2272 _t_osr_compilation.add(time); 2273 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2274 } else { 2275 _t_standard_compilation.add(time); 2276 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2277 } 2278 } 2279 2280 if (UsePerfData) { 2281 // save the name of the last method compiled 2282 _perf_last_method->set_value(counters->current_method()); 2283 _perf_last_compile_type->set_value(counters->compile_type()); 2284 _perf_last_compile_size->set_value(method->code_size() + 2285 task->num_inlined_bytecodes()); 2286 if (is_osr) { 2287 _perf_osr_compilation->inc(time.ticks()); 2288 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2289 } else { 2290 _perf_standard_compilation->inc(time.ticks()); 2291 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2292 } 2293 } 2294 2295 if (CITimeEach) { 2296 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2297 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2298 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2299 } 2300 2301 // Collect counts of successful compilations 2302 _sum_nmethod_size += code->total_size(); 2303 _sum_nmethod_code_size += code->insts_size(); 2304 _total_compile_count++; 2305 2306 if (UsePerfData) { 2307 _perf_sum_nmethod_size->inc( code->total_size()); 2308 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2309 _perf_total_compile_count->inc(); 2310 } 2311 2312 if (is_osr) { 2313 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2314 _total_osr_compile_count++; 2315 } else { 2316 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2317 _total_standard_compile_count++; 2318 } 2319 } 2320 // set the current method for the thread to null 2321 if (UsePerfData) counters->set_current_method(""); 2322 } 2323 2324 const char* CompileBroker::compiler_name(int comp_level) { 2325 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2326 if (comp == NULL) { 2327 return "no compiler"; 2328 } else { 2329 return (comp->name()); 2330 } 2331 } 2332 2333 void CompileBroker::print_times() { 2334 tty->cr(); 2335 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2336 tty->print_cr("------------------------------------------------"); 2337 //0000000000111111111122222222223333333333444444444455555555556666666666 2338 //0123456789012345678901234567890123456789012345678901234567890123456789 2339 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2340 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2341 CompileBroker::_t_standard_compilation.seconds(), 2342 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2343 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); 2344 2345 AbstractCompiler *comp = compiler(CompLevel_simple); 2346 if (comp != NULL) { 2347 comp->print_timers(); 2348 } 2349 comp = compiler(CompLevel_full_optimization); 2350 if (comp != NULL) { 2351 comp->print_timers(); 2352 } 2353 tty->cr(); 2354 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2355 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2356 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2357 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2358 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2359 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2360 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2361 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2362 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2363 tty->cr(); 2364 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2365 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2366 } 2367 2368 // Debugging output for failure 2369 void CompileBroker::print_last_compile() { 2370 if ( _last_compile_level != CompLevel_none && 2371 compiler(_last_compile_level) != NULL && 2372 _last_method_compiled != NULL && 2373 _last_compile_type != no_compile) { 2374 if (_last_compile_type == osr_compile) { 2375 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2376 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2377 } else { 2378 tty->print_cr("Last parse: %d+++(%d) %s", 2379 _compilation_id, _last_compile_level, _last_method_compiled); 2380 } 2381 } 2382 } 2383 2384 2385 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2386 #ifndef PRODUCT 2387 st->print_cr("Compiler thread printing unimplemented."); 2388 st->cr(); 2389 #endif 2390 }