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