1 /* 2 * Copyright (c) 1999, 2023, 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/javaClasses.inline.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "classfile/vmClasses.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/codeCache.hpp" 31 #include "code/codeHeapState.hpp" 32 #include "code/dependencyContext.hpp" 33 #include "compiler/compilationLog.hpp" 34 #include "compiler/compilationMemoryStatistic.hpp" 35 #include "compiler/compilationPolicy.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "compiler/compileLog.hpp" 38 #include "compiler/compilerEvent.hpp" 39 #include "compiler/compilerOracle.hpp" 40 #include "compiler/directivesParser.hpp" 41 #include "interpreter/linkResolver.hpp" 42 #include "jvm.h" 43 #include "jfr/jfrEvents.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.hpp" 49 #include "oops/methodData.hpp" 50 #include "oops/method.inline.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "prims/jvmtiExport.hpp" 53 #include "prims/nativeLookup.hpp" 54 #include "prims/whitebox.hpp" 55 #include "runtime/atomic.hpp" 56 #include "runtime/escapeBarrier.hpp" 57 #include "runtime/globals_extension.hpp" 58 #include "runtime/handles.inline.hpp" 59 #include "runtime/init.hpp" 60 #include "runtime/interfaceSupport.inline.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/jniHandles.inline.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/perfData.hpp" 66 #include "runtime/safepointVerifiers.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/threads.hpp" 69 #include "runtime/threadSMR.hpp" 70 #include "runtime/timerTrace.hpp" 71 #include "runtime/vframe.inline.hpp" 72 #include "utilities/debug.hpp" 73 #include "utilities/dtrace.hpp" 74 #include "utilities/events.hpp" 75 #include "utilities/formatBuffer.hpp" 76 #include "utilities/macros.hpp" 77 #ifdef COMPILER1 78 #include "c1/c1_Compiler.hpp" 79 #endif 80 #ifdef COMPILER2 81 #include "opto/c2compiler.hpp" 82 #endif 83 #if INCLUDE_JVMCI 84 #include "jvmci/jvmciEnv.hpp" 85 #include "jvmci/jvmciRuntime.hpp" 86 #endif 87 88 #ifdef DTRACE_ENABLED 89 90 // Only bother with this argument setup if dtrace is available 91 92 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 93 { \ 94 Symbol* klass_name = (method)->klass_name(); \ 95 Symbol* name = (method)->name(); \ 96 Symbol* signature = (method)->signature(); \ 97 HOTSPOT_METHOD_COMPILE_BEGIN( \ 98 (char *) comp_name, strlen(comp_name), \ 99 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 100 (char *) name->bytes(), name->utf8_length(), \ 101 (char *) signature->bytes(), signature->utf8_length()); \ 102 } 103 104 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 105 { \ 106 Symbol* klass_name = (method)->klass_name(); \ 107 Symbol* name = (method)->name(); \ 108 Symbol* signature = (method)->signature(); \ 109 HOTSPOT_METHOD_COMPILE_END( \ 110 (char *) comp_name, strlen(comp_name), \ 111 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 112 (char *) name->bytes(), name->utf8_length(), \ 113 (char *) signature->bytes(), signature->utf8_length(), (success)); \ 114 } 115 116 #else // ndef DTRACE_ENABLED 117 118 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 119 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 120 121 #endif // ndef DTRACE_ENABLED 122 123 bool CompileBroker::_initialized = false; 124 volatile bool CompileBroker::_should_block = false; 125 volatile int CompileBroker::_print_compilation_warning = 0; 126 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 127 128 // The installed compiler(s) 129 AbstractCompiler* CompileBroker::_compilers[2]; 130 131 // The maximum numbers of compiler threads to be determined during startup. 132 int CompileBroker::_c1_count = 0; 133 int CompileBroker::_c2_count = 0; 134 135 // An array of compiler names as Java String objects 136 jobject* CompileBroker::_compiler1_objects = nullptr; 137 jobject* CompileBroker::_compiler2_objects = nullptr; 138 139 CompileLog** CompileBroker::_compiler1_logs = nullptr; 140 CompileLog** CompileBroker::_compiler2_logs = nullptr; 141 142 // These counters are used to assign an unique ID to each compilation. 143 volatile jint CompileBroker::_compilation_id = 0; 144 volatile jint CompileBroker::_osr_compilation_id = 0; 145 volatile jint CompileBroker::_native_compilation_id = 0; 146 147 // Performance counters 148 PerfCounter* CompileBroker::_perf_total_compilation = nullptr; 149 PerfCounter* CompileBroker::_perf_osr_compilation = nullptr; 150 PerfCounter* CompileBroker::_perf_standard_compilation = nullptr; 151 152 PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr; 153 PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr; 154 PerfCounter* CompileBroker::_perf_total_compile_count = nullptr; 155 PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr; 156 PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr; 157 158 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr; 159 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr; 160 PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr; 161 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr; 162 163 PerfStringVariable* CompileBroker::_perf_last_method = nullptr; 164 PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr; 165 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr; 166 PerfVariable* CompileBroker::_perf_last_compile_type = nullptr; 167 PerfVariable* CompileBroker::_perf_last_compile_size = nullptr; 168 PerfVariable* CompileBroker::_perf_last_failed_type = nullptr; 169 PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr; 170 171 // Timers and counters for generating statistics 172 elapsedTimer CompileBroker::_t_total_compilation; 173 elapsedTimer CompileBroker::_t_osr_compilation; 174 elapsedTimer CompileBroker::_t_standard_compilation; 175 elapsedTimer CompileBroker::_t_invalidated_compilation; 176 elapsedTimer CompileBroker::_t_bailedout_compilation; 177 178 uint CompileBroker::_total_bailout_count = 0; 179 uint CompileBroker::_total_invalidated_count = 0; 180 uint CompileBroker::_total_compile_count = 0; 181 uint CompileBroker::_total_osr_compile_count = 0; 182 uint CompileBroker::_total_standard_compile_count = 0; 183 uint CompileBroker::_total_compiler_stopped_count = 0; 184 uint CompileBroker::_total_compiler_restarted_count = 0; 185 186 uint CompileBroker::_sum_osr_bytes_compiled = 0; 187 uint CompileBroker::_sum_standard_bytes_compiled = 0; 188 uint CompileBroker::_sum_nmethod_size = 0; 189 uint CompileBroker::_sum_nmethod_code_size = 0; 190 191 jlong CompileBroker::_peak_compilation_time = 0; 192 193 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization]; 194 195 CompileQueue* CompileBroker::_c2_compile_queue = nullptr; 196 CompileQueue* CompileBroker::_c1_compile_queue = nullptr; 197 198 bool compileBroker_init() { 199 if (LogEvents) { 200 CompilationLog::init(); 201 } 202 203 // init directives stack, adding default directive 204 DirectivesStack::init(); 205 206 if (DirectivesParser::has_file()) { 207 return DirectivesParser::parse_from_flag(); 208 } else if (CompilerDirectivesPrint) { 209 // Print default directive even when no other was added 210 DirectivesStack::print(tty); 211 } 212 213 return true; 214 } 215 216 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 217 CompilerThread* thread = CompilerThread::current(); 218 thread->set_task(task); 219 CompileLog* log = thread->log(); 220 if (log != nullptr && !task->is_unloaded()) task->log_task_start(log); 221 } 222 223 CompileTaskWrapper::~CompileTaskWrapper() { 224 CompilerThread* thread = CompilerThread::current(); 225 CompileTask* task = thread->task(); 226 CompileLog* log = thread->log(); 227 if (log != nullptr && !task->is_unloaded()) task->log_task_done(log); 228 thread->set_task(nullptr); 229 thread->set_env(nullptr); 230 if (task->is_blocking()) { 231 bool free_task = false; 232 { 233 MutexLocker notifier(thread, task->lock()); 234 task->mark_complete(); 235 #if INCLUDE_JVMCI 236 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) { 237 if (!task->has_waiter()) { 238 // The waiting thread timed out and thus did not free the task. 239 free_task = true; 240 } 241 task->set_blocking_jvmci_compile_state(nullptr); 242 } 243 #endif 244 if (!free_task) { 245 // Notify the waiting thread that the compilation has completed 246 // so that it can free the task. 247 task->lock()->notify_all(); 248 } 249 } 250 if (free_task) { 251 // The task can only be freed once the task lock is released. 252 CompileTask::free(task); 253 } 254 } else { 255 task->mark_complete(); 256 257 // By convention, the compiling thread is responsible for 258 // recycling a non-blocking CompileTask. 259 CompileTask::free(task); 260 } 261 } 262 263 /** 264 * Check if a CompilerThread can be removed and update count if requested. 265 */ 266 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) { 267 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here"); 268 if (!ReduceNumberOfCompilerThreads) return false; 269 270 AbstractCompiler *compiler = ct->compiler(); 271 int compiler_count = compiler->num_compiler_threads(); 272 bool c1 = compiler->is_c1(); 273 274 // Keep at least 1 compiler thread of each type. 275 if (compiler_count < 2) return false; 276 277 // Keep thread alive for at least some time. 278 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false; 279 280 #if INCLUDE_JVMCI 281 if (compiler->is_jvmci()) { 282 // Handles for JVMCI thread objects may get released concurrently. 283 if (do_it) { 284 assert(CompileThread_lock->owner() == ct, "must be holding lock"); 285 } else { 286 // Skip check if it's the last thread and let caller check again. 287 return true; 288 } 289 } 290 #endif 291 292 // We only allow the last compiler thread of each type to get removed. 293 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1) 294 : compiler2_object(compiler_count - 1); 295 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) { 296 if (do_it) { 297 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent. 298 compiler->set_num_compiler_threads(compiler_count - 1); 299 #if INCLUDE_JVMCI 300 if (compiler->is_jvmci()) { 301 // Old j.l.Thread object can die when no longer referenced elsewhere. 302 JNIHandles::destroy_global(compiler2_object(compiler_count - 1)); 303 _compiler2_objects[compiler_count - 1] = nullptr; 304 } 305 #endif 306 } 307 return true; 308 } 309 return false; 310 } 311 312 /** 313 * Add a CompileTask to a CompileQueue. 314 */ 315 void CompileQueue::add(CompileTask* task) { 316 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 317 318 task->set_next(nullptr); 319 task->set_prev(nullptr); 320 321 if (_last == nullptr) { 322 // The compile queue is empty. 323 assert(_first == nullptr, "queue is empty"); 324 _first = task; 325 _last = task; 326 } else { 327 // Append the task to the queue. 328 assert(_last->next() == nullptr, "not last"); 329 _last->set_next(task); 330 task->set_prev(_last); 331 _last = task; 332 } 333 ++_size; 334 ++_total_added; 335 if (_size > _peak_size) { 336 _peak_size = _size; 337 } 338 339 // Mark the method as being in the compile queue. 340 task->method()->set_queued_for_compilation(); 341 342 if (CIPrintCompileQueue) { 343 print_tty(); 344 } 345 346 if (LogCompilation && xtty != nullptr) { 347 task->log_task_queued(); 348 } 349 350 // Notify CompilerThreads that a task is available. 351 MethodCompileQueue_lock->notify_all(); 352 } 353 354 /** 355 * Empties compilation queue by putting all compilation tasks onto 356 * a freelist. Furthermore, the method wakes up all threads that are 357 * waiting on a compilation task to finish. This can happen if background 358 * compilation is disabled. 359 */ 360 void CompileQueue::free_all() { 361 MutexLocker mu(MethodCompileQueue_lock); 362 CompileTask* next = _first; 363 364 // Iterate over all tasks in the compile queue 365 while (next != nullptr) { 366 CompileTask* current = next; 367 next = current->next(); 368 { 369 // Wake up thread that blocks on the compile task. 370 MutexLocker ct_lock(current->lock()); 371 current->lock()->notify(); 372 } 373 // Put the task back on the freelist. 374 CompileTask::free(current); 375 } 376 _first = nullptr; 377 _last = nullptr; 378 379 // Wake up all threads that block on the queue. 380 MethodCompileQueue_lock->notify_all(); 381 } 382 383 /** 384 * Get the next CompileTask from a CompileQueue 385 */ 386 CompileTask* CompileQueue::get(CompilerThread* thread) { 387 // save methods from RedefineClasses across safepoint 388 // across MethodCompileQueue_lock below. 389 methodHandle save_method; 390 methodHandle save_hot_method; 391 392 MonitorLocker locker(MethodCompileQueue_lock); 393 // If _first is null we have no more compile jobs. There are two reasons for 394 // having no compile jobs: First, we compiled everything we wanted. Second, 395 // we ran out of code cache so compilation has been disabled. In the latter 396 // case we perform code cache sweeps to free memory such that we can re-enable 397 // compilation. 398 while (_first == nullptr) { 399 // Exit loop if compilation is disabled forever 400 if (CompileBroker::is_compilation_disabled_forever()) { 401 return nullptr; 402 } 403 404 AbstractCompiler* compiler = thread->compiler(); 405 guarantee(compiler != nullptr, "Compiler object must exist"); 406 compiler->on_empty_queue(this, thread); 407 if (_first != nullptr) { 408 // The call to on_empty_queue may have temporarily unlocked the MCQ lock 409 // so check again whether any tasks were added to the queue. 410 break; 411 } 412 413 // If there are no compilation tasks and we can compile new jobs 414 // (i.e., there is enough free space in the code cache) there is 415 // no need to invoke the GC. 416 // We need a timed wait here, since compiler threads can exit if compilation 417 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 418 // is not critical and we do not want idle compiler threads to wake up too often. 419 locker.wait(5*1000); 420 421 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) { 422 // Still nothing to compile. Give caller a chance to stop this thread. 423 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr; 424 } 425 } 426 427 if (CompileBroker::is_compilation_disabled_forever()) { 428 return nullptr; 429 } 430 431 CompileTask* task; 432 { 433 NoSafepointVerifier nsv; 434 task = CompilationPolicy::select_task(this); 435 if (task != nullptr) { 436 task = task->select_for_compilation(); 437 } 438 } 439 440 if (task != nullptr) { 441 // Save method pointers across unlock safepoint. The task is removed from 442 // the compilation queue, which is walked during RedefineClasses. 443 Thread* thread = Thread::current(); 444 save_method = methodHandle(thread, task->method()); 445 save_hot_method = methodHandle(thread, task->hot_method()); 446 447 remove(task); 448 } 449 purge_stale_tasks(); // may temporarily release MCQ lock 450 return task; 451 } 452 453 // Clean & deallocate stale compile tasks. 454 // Temporarily releases MethodCompileQueue lock. 455 void CompileQueue::purge_stale_tasks() { 456 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 457 if (_first_stale != nullptr) { 458 // Stale tasks are purged when MCQ lock is released, 459 // but _first_stale updates are protected by MCQ lock. 460 // Once task processing starts and MCQ lock is released, 461 // other compiler threads can reuse _first_stale. 462 CompileTask* head = _first_stale; 463 _first_stale = nullptr; 464 { 465 MutexUnlocker ul(MethodCompileQueue_lock); 466 for (CompileTask* task = head; task != nullptr; ) { 467 CompileTask* next_task = task->next(); 468 CompileTaskWrapper ctw(task); // Frees the task 469 task->set_failure_reason("stale task"); 470 task = next_task; 471 } 472 } 473 } 474 } 475 476 void CompileQueue::remove(CompileTask* task) { 477 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 478 if (task->prev() != nullptr) { 479 task->prev()->set_next(task->next()); 480 } else { 481 // max is the first element 482 assert(task == _first, "Sanity"); 483 _first = task->next(); 484 } 485 486 if (task->next() != nullptr) { 487 task->next()->set_prev(task->prev()); 488 } else { 489 // max is the last element 490 assert(task == _last, "Sanity"); 491 _last = task->prev(); 492 } 493 --_size; 494 ++_total_removed; 495 } 496 497 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 498 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 499 remove(task); 500 501 // Enqueue the task for reclamation (should be done outside MCQ lock) 502 task->set_next(_first_stale); 503 task->set_prev(nullptr); 504 _first_stale = task; 505 } 506 507 // methods in the compile queue need to be marked as used on the stack 508 // so that they don't get reclaimed by Redefine Classes 509 void CompileQueue::mark_on_stack() { 510 CompileTask* task = _first; 511 while (task != nullptr) { 512 task->mark_on_stack(); 513 task = task->next(); 514 } 515 } 516 517 518 CompileQueue* CompileBroker::compile_queue(int comp_level) { 519 if (is_c2_compile(comp_level)) return _c2_compile_queue; 520 if (is_c1_compile(comp_level)) return _c1_compile_queue; 521 return nullptr; 522 } 523 524 CompileQueue* CompileBroker::c1_compile_queue() { 525 return _c1_compile_queue; 526 } 527 528 CompileQueue* CompileBroker::c2_compile_queue() { 529 return _c2_compile_queue; 530 } 531 532 void CompileBroker::print_compile_queues(outputStream* st) { 533 st->print_cr("Current compiles: "); 534 535 char buf[2000]; 536 int buflen = sizeof(buf); 537 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true); 538 539 st->cr(); 540 if (_c1_compile_queue != nullptr) { 541 _c1_compile_queue->print(st); 542 } 543 if (_c2_compile_queue != nullptr) { 544 _c2_compile_queue->print(st); 545 } 546 } 547 548 void CompileQueue::print(outputStream* st) { 549 assert_locked_or_safepoint(MethodCompileQueue_lock); 550 st->print_cr("%s:", name()); 551 CompileTask* task = _first; 552 if (task == nullptr) { 553 st->print_cr("Empty"); 554 } else { 555 while (task != nullptr) { 556 task->print(st, nullptr, true, true); 557 task = task->next(); 558 } 559 } 560 st->cr(); 561 } 562 563 void CompileQueue::print_tty() { 564 stringStream ss; 565 // Dump the compile queue into a buffer before locking the tty 566 print(&ss); 567 { 568 ttyLocker ttyl; 569 tty->print("%s", ss.freeze()); 570 } 571 } 572 573 CompilerCounters::CompilerCounters() { 574 _current_method[0] = '\0'; 575 _compile_type = CompileBroker::no_compile; 576 } 577 578 #if INCLUDE_JFR && COMPILER2_OR_JVMCI 579 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping 580 // in compiler/compilerEvent.cpp) and registers it with its serializer. 581 // 582 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp, 583 // so if c2 is used, it should be always registered first. 584 // This function is called during vm initialization. 585 void register_jfr_phasetype_serializer(CompilerType compiler_type) { 586 ResourceMark rm; 587 static bool first_registration = true; 588 if (compiler_type == compiler_jvmci) { 589 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false); 590 first_registration = false; 591 #ifdef COMPILER2 592 } else if (compiler_type == compiler_c2) { 593 assert(first_registration, "invariant"); // c2 must be registered first. 594 for (int i = 0; i < PHASE_NUM_TYPES; i++) { 595 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i); 596 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false); 597 } 598 first_registration = false; 599 #endif // COMPILER2 600 } 601 } 602 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI 603 604 // ------------------------------------------------------------------ 605 // CompileBroker::compilation_init 606 // 607 // Initialize the Compilation object 608 void CompileBroker::compilation_init(JavaThread* THREAD) { 609 // No need to initialize compilation system if we do not use it. 610 if (!UseCompiler) { 611 return; 612 } 613 // Set the interface to the current compiler(s). 614 _c1_count = CompilationPolicy::c1_count(); 615 _c2_count = CompilationPolicy::c2_count(); 616 617 #if INCLUDE_JVMCI 618 if (EnableJVMCI) { 619 // This is creating a JVMCICompiler singleton. 620 JVMCICompiler* jvmci = new JVMCICompiler(); 621 622 if (UseJVMCICompiler) { 623 _compilers[1] = jvmci; 624 if (FLAG_IS_DEFAULT(JVMCIThreads)) { 625 if (BootstrapJVMCI) { 626 // JVMCI will bootstrap so give it more threads 627 _c2_count = MIN2(32, os::active_processor_count()); 628 } 629 } else { 630 _c2_count = JVMCIThreads; 631 } 632 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) { 633 } else { 634 #ifdef COMPILER1 635 _c1_count = JVMCIHostThreads; 636 #endif // COMPILER1 637 } 638 } 639 } 640 #endif // INCLUDE_JVMCI 641 642 #ifdef COMPILER1 643 if (_c1_count > 0) { 644 _compilers[0] = new Compiler(); 645 } 646 #endif // COMPILER1 647 648 #ifdef COMPILER2 649 if (true JVMCI_ONLY( && !UseJVMCICompiler)) { 650 if (_c2_count > 0) { 651 _compilers[1] = new C2Compiler(); 652 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit. 653 // idToPhase mapping for c2 is in opto/phasetype.hpp 654 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);) 655 } 656 } 657 #endif // COMPILER2 658 659 #if INCLUDE_JVMCI 660 // Register after c2 registration. 661 // JVMCI CompilerPhaseType idToPhase mapping is dynamic. 662 if (EnableJVMCI) { 663 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);) 664 } 665 #endif // INCLUDE_JVMCI 666 667 if (CompilerOracle::should_collect_memstat()) { 668 CompilationMemoryStatistic::initialize(); 669 } 670 671 // Start the compiler thread(s) 672 init_compiler_threads(); 673 // totalTime performance counter is always created as it is required 674 // by the implementation of java.lang.management.CompilationMXBean. 675 { 676 // Ensure OOM leads to vm_exit_during_initialization. 677 EXCEPTION_MARK; 678 _perf_total_compilation = 679 PerfDataManager::create_counter(JAVA_CI, "totalTime", 680 PerfData::U_Ticks, CHECK); 681 } 682 683 if (UsePerfData) { 684 685 EXCEPTION_MARK; 686 687 // create the jvmstat performance counters 688 _perf_osr_compilation = 689 PerfDataManager::create_counter(SUN_CI, "osrTime", 690 PerfData::U_Ticks, CHECK); 691 692 _perf_standard_compilation = 693 PerfDataManager::create_counter(SUN_CI, "standardTime", 694 PerfData::U_Ticks, CHECK); 695 696 _perf_total_bailout_count = 697 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 698 PerfData::U_Events, CHECK); 699 700 _perf_total_invalidated_count = 701 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 702 PerfData::U_Events, CHECK); 703 704 _perf_total_compile_count = 705 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 706 PerfData::U_Events, CHECK); 707 _perf_total_osr_compile_count = 708 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 709 PerfData::U_Events, CHECK); 710 711 _perf_total_standard_compile_count = 712 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 713 PerfData::U_Events, CHECK); 714 715 _perf_sum_osr_bytes_compiled = 716 PerfDataManager::create_counter(SUN_CI, "osrBytes", 717 PerfData::U_Bytes, CHECK); 718 719 _perf_sum_standard_bytes_compiled = 720 PerfDataManager::create_counter(SUN_CI, "standardBytes", 721 PerfData::U_Bytes, CHECK); 722 723 _perf_sum_nmethod_size = 724 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 725 PerfData::U_Bytes, CHECK); 726 727 _perf_sum_nmethod_code_size = 728 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 729 PerfData::U_Bytes, CHECK); 730 731 _perf_last_method = 732 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 733 CompilerCounters::cmname_buffer_length, 734 "", CHECK); 735 736 _perf_last_failed_method = 737 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 738 CompilerCounters::cmname_buffer_length, 739 "", CHECK); 740 741 _perf_last_invalidated_method = 742 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 743 CompilerCounters::cmname_buffer_length, 744 "", CHECK); 745 746 _perf_last_compile_type = 747 PerfDataManager::create_variable(SUN_CI, "lastType", 748 PerfData::U_None, 749 (jlong)CompileBroker::no_compile, 750 CHECK); 751 752 _perf_last_compile_size = 753 PerfDataManager::create_variable(SUN_CI, "lastSize", 754 PerfData::U_Bytes, 755 (jlong)CompileBroker::no_compile, 756 CHECK); 757 758 759 _perf_last_failed_type = 760 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 761 PerfData::U_None, 762 (jlong)CompileBroker::no_compile, 763 CHECK); 764 765 _perf_last_invalidated_type = 766 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 767 PerfData::U_None, 768 (jlong)CompileBroker::no_compile, 769 CHECK); 770 } 771 772 _initialized = true; 773 } 774 775 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) { 776 Handle thread_oop = JavaThread::create_system_thread_object(name, CHECK_NH); 777 return thread_oop; 778 } 779 780 #if defined(ASSERT) && COMPILER2_OR_JVMCI 781 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to 782 // the running java application. Configured with vm options DeoptimizeObjectsALot*. 783 class DeoptimizeObjectsALotThread : public JavaThread { 784 785 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS); 786 void deoptimize_objects_alot_loop_single(); 787 void deoptimize_objects_alot_loop_all(); 788 789 public: 790 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { } 791 792 bool is_hidden_from_external_view() const { return true; } 793 }; 794 795 // Entry for DeoptimizeObjectsALotThread. The threads are started in 796 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled 797 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) { 798 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread); 799 bool enter_single_loop; 800 { 801 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag); 802 static int single_thread_count = 0; 803 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle; 804 } 805 if (enter_single_loop) { 806 dt->deoptimize_objects_alot_loop_single(); 807 } else { 808 dt->deoptimize_objects_alot_loop_all(); 809 } 810 } 811 812 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each 813 // barrier targets a single thread which is selected round robin. 814 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() { 815 HandleMark hm(this); 816 while (true) { 817 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) { 818 { // Begin new scope for escape barrier 819 HandleMarkCleaner hmc(this); 820 ResourceMark rm(this); 821 EscapeBarrier eb(true, this, deoptee_thread); 822 eb.deoptimize_objects(100); 823 } 824 // Now sleep after the escape barriers destructor resumed deoptee_thread. 825 sleep(DeoptimizeObjectsALotInterval); 826 } 827 } 828 } 829 830 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each 831 // barrier targets all java threads in the vm at once. 832 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() { 833 HandleMark hm(this); 834 while (true) { 835 { // Begin new scope for escape barrier 836 HandleMarkCleaner hmc(this); 837 ResourceMark rm(this); 838 EscapeBarrier eb(true, this); 839 eb.deoptimize_objects_all_threads(); 840 } 841 // Now sleep after the escape barriers destructor resumed the java threads. 842 sleep(DeoptimizeObjectsALotInterval); 843 } 844 } 845 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI 846 847 848 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) { 849 JavaThread* new_thread = nullptr; 850 851 switch (type) { 852 case compiler_t: 853 assert(comp != nullptr, "Compiler instance missing."); 854 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) { 855 CompilerCounters* counters = new CompilerCounters(); 856 new_thread = new CompilerThread(queue, counters); 857 } 858 break; 859 #if defined(ASSERT) && COMPILER2_OR_JVMCI 860 case deoptimizer_t: 861 new_thread = new DeoptimizeObjectsALotThread(); 862 break; 863 #endif // ASSERT 864 default: 865 ShouldNotReachHere(); 866 } 867 868 // At this point the new CompilerThread data-races with this startup 869 // thread (which is the main thread and NOT the VM thread). 870 // This means Java bytecodes being executed at startup can 871 // queue compile jobs which will run at whatever default priority the 872 // newly created CompilerThread runs at. 873 874 875 // At this point it may be possible that no osthread was created for the 876 // JavaThread due to lack of resources. We will handle that failure below. 877 // Also check new_thread so that static analysis is happy. 878 if (new_thread != nullptr && new_thread->osthread() != nullptr) { 879 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle)); 880 881 if (type == compiler_t) { 882 CompilerThread::cast(new_thread)->set_compiler(comp); 883 } 884 885 // Note that we cannot call os::set_priority because it expects Java 886 // priorities and we are *explicitly* using OS priorities so that it's 887 // possible to set the compiler thread priority higher than any Java 888 // thread. 889 890 int native_prio = CompilerThreadPriority; 891 if (native_prio == -1) { 892 if (UseCriticalCompilerThreadPriority) { 893 native_prio = os::java_to_os_priority[CriticalPriority]; 894 } else { 895 native_prio = os::java_to_os_priority[NearMaxPriority]; 896 } 897 } 898 os::set_native_priority(new_thread, native_prio); 899 900 // Note that this only sets the JavaThread _priority field, which by 901 // definition is limited to Java priorities and not OS priorities. 902 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority); 903 904 } else { // osthread initialization failure 905 if (UseDynamicNumberOfCompilerThreads && type == compiler_t 906 && comp->num_compiler_threads() > 0) { 907 // The new thread is not known to Thread-SMR yet so we can just delete. 908 delete new_thread; 909 return nullptr; 910 } else { 911 vm_exit_during_initialization("java.lang.OutOfMemoryError", 912 os::native_thread_creation_failed_msg()); 913 } 914 } 915 916 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 917 918 return new_thread; 919 } 920 921 static bool trace_compiler_threads() { 922 LogTarget(Debug, jit, thread) lt; 923 return TraceCompilerThreads || lt.is_enabled(); 924 } 925 926 static void print_compiler_threads(stringStream& msg) { 927 if (TraceCompilerThreads) { 928 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string()); 929 } 930 LogTarget(Debug, jit, thread) lt; 931 if (lt.is_enabled()) { 932 LogStream ls(lt); 933 ls.print_cr("%s", msg.as_string()); 934 } 935 } 936 937 void CompileBroker::init_compiler_threads() { 938 // Ensure any exceptions lead to vm_exit_during_initialization. 939 EXCEPTION_MARK; 940 #if !defined(ZERO) 941 assert(_c2_count > 0 || _c1_count > 0, "No compilers?"); 942 #endif // !ZERO 943 // Initialize the compilation queue 944 if (_c2_count > 0) { 945 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue"; 946 _c2_compile_queue = new CompileQueue(name); 947 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler); 948 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler); 949 } 950 if (_c1_count > 0) { 951 _c1_compile_queue = new CompileQueue("C1 compile queue"); 952 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler); 953 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler); 954 } 955 956 char name_buffer[256]; 957 958 for (int i = 0; i < _c2_count; i++) { 959 jobject thread_handle = nullptr; 960 // Create all j.l.Thread objects for C1 and C2 threads here, but only one 961 // for JVMCI compiler which can create further ones on demand. 962 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {) 963 // Create a name for our thread. 964 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i); 965 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 966 thread_handle = JNIHandles::make_global(thread_oop); 967 JVMCI_ONLY(}) 968 _compiler2_objects[i] = thread_handle; 969 _compiler2_logs[i] = nullptr; 970 971 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 972 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD); 973 assert(ct != nullptr, "should have been handled for initial thread"); 974 _compilers[1]->set_num_compiler_threads(i + 1); 975 if (trace_compiler_threads()) { 976 ResourceMark rm; 977 ThreadsListHandle tlh; // name() depends on the TLH. 978 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct)); 979 stringStream msg; 980 msg.print("Added initial compiler thread %s", ct->name()); 981 print_compiler_threads(msg); 982 } 983 } 984 } 985 986 for (int i = 0; i < _c1_count; i++) { 987 // Create a name for our thread. 988 os::snprintf_checked(name_buffer, sizeof(name_buffer), "C1 CompilerThread%d", i); 989 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 990 jobject thread_handle = JNIHandles::make_global(thread_oop); 991 _compiler1_objects[i] = thread_handle; 992 _compiler1_logs[i] = nullptr; 993 994 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 995 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD); 996 assert(ct != nullptr, "should have been handled for initial thread"); 997 _compilers[0]->set_num_compiler_threads(i + 1); 998 if (trace_compiler_threads()) { 999 ResourceMark rm; 1000 ThreadsListHandle tlh; // name() depends on the TLH. 1001 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct)); 1002 stringStream msg; 1003 msg.print("Added initial compiler thread %s", ct->name()); 1004 print_compiler_threads(msg); 1005 } 1006 } 1007 } 1008 1009 if (UsePerfData) { 1010 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK); 1011 } 1012 1013 #if defined(ASSERT) && COMPILER2_OR_JVMCI 1014 if (DeoptimizeObjectsALot) { 1015 // Initialize and start the object deoptimizer threads 1016 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll; 1017 for (int count = 0; count < total_count; count++) { 1018 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK); 1019 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop()); 1020 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD); 1021 } 1022 } 1023 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI 1024 } 1025 1026 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) { 1027 1028 julong free_memory = os::free_memory(); 1029 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All). 1030 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled), 1031 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled); 1032 1033 // Only do attempt to start additional threads if the lock is free. 1034 if (!CompileThread_lock->try_lock()) return; 1035 1036 if (_c2_compile_queue != nullptr) { 1037 int old_c2_count = _compilers[1]->num_compiler_threads(); 1038 int new_c2_count = MIN4(_c2_count, 1039 _c2_compile_queue->size() / 2, 1040 (int)(free_memory / (200*M)), 1041 (int)(available_cc_np / (128*K))); 1042 1043 for (int i = old_c2_count; i < new_c2_count; i++) { 1044 #if INCLUDE_JVMCI 1045 if (UseJVMCICompiler) { 1046 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread 1047 // objects as their existence is completely hidden from the rest of 1048 // the VM (and those compiler threads can't call Java code to do the 1049 // creation anyway). For JVMCI we have to create new j.l.Thread objects 1050 // as they are visible and we can see unexpected thread lifecycle 1051 // transitions if we bind them to new JavaThreads. 1052 if (!THREAD->can_call_java()) break; 1053 char name_buffer[256]; 1054 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i); 1055 Handle thread_oop; 1056 { 1057 // We have to give up the lock temporarily for the Java calls. 1058 MutexUnlocker mu(CompileThread_lock); 1059 thread_oop = create_thread_oop(name_buffer, THREAD); 1060 } 1061 if (HAS_PENDING_EXCEPTION) { 1062 if (trace_compiler_threads()) { 1063 ResourceMark rm; 1064 stringStream msg; 1065 msg.print_cr("JVMCI compiler thread creation failed:"); 1066 PENDING_EXCEPTION->print_on(&msg); 1067 print_compiler_threads(msg); 1068 } 1069 CLEAR_PENDING_EXCEPTION; 1070 break; 1071 } 1072 // Check if another thread has beaten us during the Java calls. 1073 if (_compilers[1]->num_compiler_threads() != i) break; 1074 jobject thread_handle = JNIHandles::make_global(thread_oop); 1075 assert(compiler2_object(i) == nullptr, "Old one must be released!"); 1076 _compiler2_objects[i] = thread_handle; 1077 } 1078 #endif 1079 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD); 1080 if (ct == nullptr) break; 1081 _compilers[1]->set_num_compiler_threads(i + 1); 1082 if (trace_compiler_threads()) { 1083 ResourceMark rm; 1084 ThreadsListHandle tlh; // name() depends on the TLH. 1085 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct)); 1086 stringStream msg; 1087 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)", 1088 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M)); 1089 print_compiler_threads(msg); 1090 } 1091 } 1092 } 1093 1094 if (_c1_compile_queue != nullptr) { 1095 int old_c1_count = _compilers[0]->num_compiler_threads(); 1096 int new_c1_count = MIN4(_c1_count, 1097 _c1_compile_queue->size() / 4, 1098 (int)(free_memory / (100*M)), 1099 (int)(available_cc_p / (128*K))); 1100 1101 for (int i = old_c1_count; i < new_c1_count; i++) { 1102 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD); 1103 if (ct == nullptr) break; 1104 _compilers[0]->set_num_compiler_threads(i + 1); 1105 if (trace_compiler_threads()) { 1106 ResourceMark rm; 1107 ThreadsListHandle tlh; // name() depends on the TLH. 1108 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct)); 1109 stringStream msg; 1110 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)", 1111 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M)); 1112 print_compiler_threads(msg); 1113 } 1114 } 1115 } 1116 1117 CompileThread_lock->unlock(); 1118 } 1119 1120 1121 /** 1122 * Set the methods on the stack as on_stack so that redefine classes doesn't 1123 * reclaim them. This method is executed at a safepoint. 1124 */ 1125 void CompileBroker::mark_on_stack() { 1126 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1127 // Since we are at a safepoint, we do not need a lock to access 1128 // the compile queues. 1129 if (_c2_compile_queue != nullptr) { 1130 _c2_compile_queue->mark_on_stack(); 1131 } 1132 if (_c1_compile_queue != nullptr) { 1133 _c1_compile_queue->mark_on_stack(); 1134 } 1135 } 1136 1137 // ------------------------------------------------------------------ 1138 // CompileBroker::compile_method 1139 // 1140 // Request compilation of a method. 1141 void CompileBroker::compile_method_base(const methodHandle& method, 1142 int osr_bci, 1143 int comp_level, 1144 const methodHandle& hot_method, 1145 int hot_count, 1146 CompileTask::CompileReason compile_reason, 1147 bool blocking, 1148 Thread* thread) { 1149 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1150 assert(method->method_holder()->is_instance_klass(), 1151 "sanity check"); 1152 assert(!method->method_holder()->is_not_initialized(), 1153 "method holder must be initialized"); 1154 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1155 1156 if (CIPrintRequests) { 1157 tty->print("request: "); 1158 method->print_short_name(tty); 1159 if (osr_bci != InvocationEntryBci) { 1160 tty->print(" osr_bci: %d", osr_bci); 1161 } 1162 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count); 1163 if (!hot_method.is_null()) { 1164 tty->print(" hot: "); 1165 if (hot_method() != method()) { 1166 hot_method->print_short_name(tty); 1167 } else { 1168 tty->print("yes"); 1169 } 1170 } 1171 tty->cr(); 1172 } 1173 1174 // A request has been made for compilation. Before we do any 1175 // real work, check to see if the method has been compiled 1176 // in the meantime with a definitive result. 1177 if (compilation_is_complete(method, osr_bci, comp_level)) { 1178 return; 1179 } 1180 1181 #ifndef PRODUCT 1182 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1183 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1184 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1185 return; 1186 } 1187 } 1188 #endif 1189 1190 // If this method is already in the compile queue, then 1191 // we do not block the current thread. 1192 if (compilation_is_in_queue(method)) { 1193 // We may want to decay our counter a bit here to prevent 1194 // multiple denied requests for compilation. This is an 1195 // open compilation policy issue. Note: The other possibility, 1196 // in the case that this is a blocking compile request, is to have 1197 // all subsequent blocking requesters wait for completion of 1198 // ongoing compiles. Note that in this case we'll need a protocol 1199 // for freeing the associated compile tasks. [Or we could have 1200 // a single static monitor on which all these waiters sleep.] 1201 return; 1202 } 1203 1204 // Tiered policy requires MethodCounters to exist before adding a method to 1205 // the queue. Create if we don't have them yet. 1206 method->get_method_counters(thread); 1207 1208 // Outputs from the following MutexLocker block: 1209 CompileTask* task = nullptr; 1210 CompileQueue* queue = compile_queue(comp_level); 1211 1212 // Acquire our lock. 1213 { 1214 MutexLocker locker(thread, MethodCompileQueue_lock); 1215 1216 // Make sure the method has not slipped into the queues since 1217 // last we checked; note that those checks were "fast bail-outs". 1218 // Here we need to be more careful, see 14012000 below. 1219 if (compilation_is_in_queue(method)) { 1220 return; 1221 } 1222 1223 // We need to check again to see if the compilation has 1224 // completed. A previous compilation may have registered 1225 // some result. 1226 if (compilation_is_complete(method, osr_bci, comp_level)) { 1227 return; 1228 } 1229 1230 // We now know that this compilation is not pending, complete, 1231 // or prohibited. Assign a compile_id to this compilation 1232 // and check to see if it is in our [Start..Stop) range. 1233 int compile_id = assign_compile_id(method, osr_bci); 1234 if (compile_id == 0) { 1235 // The compilation falls outside the allowed range. 1236 return; 1237 } 1238 1239 #if INCLUDE_JVMCI 1240 if (UseJVMCICompiler && blocking) { 1241 // Don't allow blocking compiles for requests triggered by JVMCI. 1242 if (thread->is_Compiler_thread()) { 1243 blocking = false; 1244 } 1245 1246 // In libjvmci, JVMCI initialization should not deadlock with other threads 1247 if (!UseJVMCINativeLibrary) { 1248 // Don't allow blocking compiles if inside a class initializer or while performing class loading 1249 vframeStream vfst(JavaThread::cast(thread)); 1250 for (; !vfst.at_end(); vfst.next()) { 1251 if (vfst.method()->is_static_initializer() || 1252 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) && 1253 vfst.method()->name() == vmSymbols::loadClass_name())) { 1254 blocking = false; 1255 break; 1256 } 1257 } 1258 1259 // Don't allow blocking compilation requests to JVMCI 1260 // if JVMCI itself is not yet initialized 1261 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) { 1262 blocking = false; 1263 } 1264 } 1265 1266 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown 1267 // to avoid deadlock between compiler thread(s) and threads run at shutdown 1268 // such as the DestroyJavaVM thread. 1269 if (JVMCI::in_shutdown()) { 1270 blocking = false; 1271 } 1272 } 1273 #endif // INCLUDE_JVMCI 1274 1275 // We will enter the compilation in the queue. 1276 // 14012000: Note that this sets the queued_for_compile bits in 1277 // the target method. We can now reason that a method cannot be 1278 // queued for compilation more than once, as follows: 1279 // Before a thread queues a task for compilation, it first acquires 1280 // the compile queue lock, then checks if the method's queued bits 1281 // are set or it has already been compiled. Thus there can not be two 1282 // instances of a compilation task for the same method on the 1283 // compilation queue. Consider now the case where the compilation 1284 // thread has already removed a task for that method from the queue 1285 // and is in the midst of compiling it. In this case, the 1286 // queued_for_compile bits must be set in the method (and these 1287 // will be visible to the current thread, since the bits were set 1288 // under protection of the compile queue lock, which we hold now. 1289 // When the compilation completes, the compiler thread first sets 1290 // the compilation result and then clears the queued_for_compile 1291 // bits. Neither of these actions are protected by a barrier (or done 1292 // under the protection of a lock), so the only guarantee we have 1293 // (on machines with TSO (Total Store Order)) is that these values 1294 // will update in that order. As a result, the only combinations of 1295 // these bits that the current thread will see are, in temporal order: 1296 // <RESULT, QUEUE> : 1297 // <0, 1> : in compile queue, but not yet compiled 1298 // <1, 1> : compiled but queue bit not cleared 1299 // <1, 0> : compiled and queue bit cleared 1300 // Because we first check the queue bits then check the result bits, 1301 // we are assured that we cannot introduce a duplicate task. 1302 // Note that if we did the tests in the reverse order (i.e. check 1303 // result then check queued bit), we could get the result bit before 1304 // the compilation completed, and the queue bit after the compilation 1305 // completed, and end up introducing a "duplicate" (redundant) task. 1306 // In that case, the compiler thread should first check if a method 1307 // has already been compiled before trying to compile it. 1308 // NOTE: in the event that there are multiple compiler threads and 1309 // there is de-optimization/recompilation, things will get hairy, 1310 // and in that case it's best to protect both the testing (here) of 1311 // these bits, and their updating (here and elsewhere) under a 1312 // common lock. 1313 task = create_compile_task(queue, 1314 compile_id, method, 1315 osr_bci, comp_level, 1316 hot_method, hot_count, compile_reason, 1317 blocking); 1318 } 1319 1320 if (blocking) { 1321 wait_for_completion(task); 1322 } 1323 } 1324 1325 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1326 int comp_level, 1327 const methodHandle& hot_method, int hot_count, 1328 CompileTask::CompileReason compile_reason, 1329 TRAPS) { 1330 // Do nothing if compilebroker is not initialized or compiles are submitted on level none 1331 if (!_initialized || comp_level == CompLevel_none) { 1332 return nullptr; 1333 } 1334 1335 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1336 assert(comp != nullptr, "Ensure we have a compiler"); 1337 1338 #if INCLUDE_JVMCI 1339 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) { 1340 // JVMCI compilation is not yet initializable. 1341 return nullptr; 1342 } 1343 #endif 1344 1345 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp); 1346 // CompileBroker::compile_method can trap and can have pending async exception. 1347 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD); 1348 DirectivesStack::release(directive); 1349 return nm; 1350 } 1351 1352 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1353 int comp_level, 1354 const methodHandle& hot_method, int hot_count, 1355 CompileTask::CompileReason compile_reason, 1356 DirectiveSet* directive, 1357 TRAPS) { 1358 1359 // make sure arguments make sense 1360 assert(method->method_holder()->is_instance_klass(), "not an instance method"); 1361 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1362 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1363 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1364 // return quickly if possible 1365 1366 // lock, make sure that the compilation 1367 // isn't prohibited in a straightforward way. 1368 AbstractCompiler* comp = CompileBroker::compiler(comp_level); 1369 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) { 1370 return nullptr; 1371 } 1372 1373 if (osr_bci == InvocationEntryBci) { 1374 // standard compilation 1375 CompiledMethod* method_code = method->code(); 1376 if (method_code != nullptr && method_code->is_nmethod()) { 1377 if (compilation_is_complete(method, osr_bci, comp_level)) { 1378 return (nmethod*) method_code; 1379 } 1380 } 1381 if (method->is_not_compilable(comp_level)) { 1382 return nullptr; 1383 } 1384 } else { 1385 // osr compilation 1386 // We accept a higher level osr method 1387 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1388 if (nm != nullptr) return nm; 1389 if (method->is_not_osr_compilable(comp_level)) return nullptr; 1390 } 1391 1392 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1393 // some prerequisites that are compiler specific 1394 if (comp->is_c2() || comp->is_jvmci()) { 1395 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL); 1396 // Resolve all classes seen in the signature of the method 1397 // we are compiling. 1398 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL); 1399 } 1400 1401 // If the method is native, do the lookup in the thread requesting 1402 // the compilation. Native lookups can load code, which is not 1403 // permitted during compilation. 1404 // 1405 // Note: A native method implies non-osr compilation which is 1406 // checked with an assertion at the entry of this method. 1407 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1408 address adr = NativeLookup::lookup(method, THREAD); 1409 if (HAS_PENDING_EXCEPTION) { 1410 // In case of an exception looking up the method, we just forget 1411 // about it. The interpreter will kick-in and throw the exception. 1412 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable() 1413 CLEAR_PENDING_EXCEPTION; 1414 return nullptr; 1415 } 1416 assert(method->has_native_function(), "must have native code by now"); 1417 } 1418 1419 // RedefineClasses() has replaced this method; just return 1420 if (method->is_old()) { 1421 return nullptr; 1422 } 1423 1424 // JVMTI -- post_compile_event requires jmethod_id() that may require 1425 // a lock the compiling thread can not acquire. Prefetch it here. 1426 if (JvmtiExport::should_post_compiled_method_load()) { 1427 method->jmethod_id(); 1428 } 1429 1430 // do the compilation 1431 if (method->is_native()) { 1432 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1433 #if defined(X86) && !defined(ZERO) 1434 // The following native methods: 1435 // 1436 // java.lang.Float.intBitsToFloat 1437 // java.lang.Float.floatToRawIntBits 1438 // java.lang.Double.longBitsToDouble 1439 // java.lang.Double.doubleToRawLongBits 1440 // 1441 // are called through the interpreter even if interpreter native stubs 1442 // are not preferred (i.e., calling through adapter handlers is preferred). 1443 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved 1444 // if the version of the methods from the native libraries is called. 1445 // As the interpreter and the C2-intrinsified version of the methods preserves 1446 // sNaNs, that would result in an inconsistent way of handling of sNaNs. 1447 if ((UseSSE >= 1 && 1448 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat || 1449 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) || 1450 (UseSSE >= 2 && 1451 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble || 1452 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) { 1453 return nullptr; 1454 } 1455 #endif // X86 && !ZERO 1456 1457 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1458 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1459 // 1460 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1461 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1462 AdapterHandlerLibrary::create_native_wrapper(method); 1463 } else { 1464 return nullptr; 1465 } 1466 } else { 1467 // If the compiler is shut off due to code cache getting full 1468 // fail out now so blocking compiles dont hang the java thread 1469 if (!should_compile_new_jobs()) { 1470 return nullptr; 1471 } 1472 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles; 1473 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD); 1474 } 1475 1476 // return requested nmethod 1477 // We accept a higher level osr method 1478 if (osr_bci == InvocationEntryBci) { 1479 CompiledMethod* code = method->code(); 1480 if (code == nullptr) { 1481 return (nmethod*) code; 1482 } else { 1483 return code->as_nmethod_or_null(); 1484 } 1485 } 1486 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1487 } 1488 1489 1490 // ------------------------------------------------------------------ 1491 // CompileBroker::compilation_is_complete 1492 // 1493 // See if compilation of this method is already complete. 1494 bool CompileBroker::compilation_is_complete(const methodHandle& method, 1495 int osr_bci, 1496 int comp_level) { 1497 bool is_osr = (osr_bci != standard_entry_bci); 1498 if (is_osr) { 1499 if (method->is_not_osr_compilable(comp_level)) { 1500 return true; 1501 } else { 1502 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1503 return (result != nullptr); 1504 } 1505 } else { 1506 if (method->is_not_compilable(comp_level)) { 1507 return true; 1508 } else { 1509 CompiledMethod* result = method->code(); 1510 if (result == nullptr) return false; 1511 return comp_level == result->comp_level(); 1512 } 1513 } 1514 } 1515 1516 1517 /** 1518 * See if this compilation is already requested. 1519 * 1520 * Implementation note: there is only a single "is in queue" bit 1521 * for each method. This means that the check below is overly 1522 * conservative in the sense that an osr compilation in the queue 1523 * will block a normal compilation from entering the queue (and vice 1524 * versa). This can be remedied by a full queue search to disambiguate 1525 * cases. If it is deemed profitable, this may be done. 1526 */ 1527 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) { 1528 return method->queued_for_compilation(); 1529 } 1530 1531 // ------------------------------------------------------------------ 1532 // CompileBroker::compilation_is_prohibited 1533 // 1534 // See if this compilation is not allowed. 1535 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) { 1536 bool is_native = method->is_native(); 1537 // Some compilers may not support the compilation of natives. 1538 AbstractCompiler *comp = compiler(comp_level); 1539 if (is_native && (!CICompileNatives || comp == nullptr)) { 1540 method->set_not_compilable_quietly("native methods not supported", comp_level); 1541 return true; 1542 } 1543 1544 bool is_osr = (osr_bci != standard_entry_bci); 1545 // Some compilers may not support on stack replacement. 1546 if (is_osr && (!CICompileOSR || comp == nullptr)) { 1547 method->set_not_osr_compilable("OSR not supported", comp_level); 1548 return true; 1549 } 1550 1551 // The method may be explicitly excluded by the user. 1552 double scale; 1553 if (excluded || (CompilerOracle::has_option_value(method, CompileCommand::CompileThresholdScaling, scale) && scale == 0)) { 1554 bool quietly = CompilerOracle::be_quiet(); 1555 if (PrintCompilation && !quietly) { 1556 // This does not happen quietly... 1557 ResourceMark rm; 1558 tty->print("### Excluding %s:%s", 1559 method->is_native() ? "generation of native wrapper" : "compile", 1560 (method->is_static() ? " static" : "")); 1561 method->print_short_name(tty); 1562 tty->cr(); 1563 } 1564 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly); 1565 } 1566 1567 return false; 1568 } 1569 1570 /** 1571 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1572 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1573 * The function also allows to generate separate compilation IDs for OSR compilations. 1574 */ 1575 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) { 1576 #ifdef ASSERT 1577 bool is_osr = (osr_bci != standard_entry_bci); 1578 int id; 1579 if (method->is_native()) { 1580 assert(!is_osr, "can't be osr"); 1581 // Adapters, native wrappers and method handle intrinsics 1582 // should be generated always. 1583 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1); 1584 } else if (CICountOSR && is_osr) { 1585 id = Atomic::add(&_osr_compilation_id, 1); 1586 if (CIStartOSR <= id && id < CIStopOSR) { 1587 return id; 1588 } 1589 } else { 1590 id = Atomic::add(&_compilation_id, 1); 1591 if (CIStart <= id && id < CIStop) { 1592 return id; 1593 } 1594 } 1595 1596 // Method was not in the appropriate compilation range. 1597 method->set_not_compilable_quietly("Not in requested compile id range"); 1598 return 0; 1599 #else 1600 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1601 // only _compilation_id is incremented. 1602 return Atomic::add(&_compilation_id, 1); 1603 #endif 1604 } 1605 1606 // ------------------------------------------------------------------ 1607 // CompileBroker::assign_compile_id_unlocked 1608 // 1609 // Public wrapper for assign_compile_id that acquires the needed locks 1610 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) { 1611 MutexLocker locker(thread, MethodCompileQueue_lock); 1612 return assign_compile_id(method, osr_bci); 1613 } 1614 1615 // ------------------------------------------------------------------ 1616 // CompileBroker::create_compile_task 1617 // 1618 // Create a CompileTask object representing the current request for 1619 // compilation. Add this task to the queue. 1620 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1621 int compile_id, 1622 const methodHandle& method, 1623 int osr_bci, 1624 int comp_level, 1625 const methodHandle& hot_method, 1626 int hot_count, 1627 CompileTask::CompileReason compile_reason, 1628 bool blocking) { 1629 CompileTask* new_task = CompileTask::allocate(); 1630 new_task->initialize(compile_id, method, osr_bci, comp_level, 1631 hot_method, hot_count, compile_reason, 1632 blocking); 1633 queue->add(new_task); 1634 return new_task; 1635 } 1636 1637 #if INCLUDE_JVMCI 1638 // The number of milliseconds to wait before checking if 1639 // JVMCI compilation has made progress. 1640 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000; 1641 1642 // The number of JVMCI compilation progress checks that must fail 1643 // before unblocking a thread waiting for a blocking compilation. 1644 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10; 1645 1646 /** 1647 * Waits for a JVMCI compiler to complete a given task. This thread 1648 * waits until either the task completes or it sees no JVMCI compilation 1649 * progress for N consecutive milliseconds where N is 1650 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE * 1651 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS. 1652 * 1653 * @return true if this thread needs to free/recycle the task 1654 */ 1655 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) { 1656 assert(UseJVMCICompiler, "sanity"); 1657 MonitorLocker ml(thread, task->lock()); 1658 int progress_wait_attempts = 0; 1659 jint thread_jvmci_compilation_ticks = 0; 1660 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks(); 1661 while (!task->is_complete() && !is_compilation_disabled_forever() && 1662 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) { 1663 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state(); 1664 1665 bool progress; 1666 if (jvmci_compile_state != nullptr) { 1667 jint ticks = jvmci_compile_state->compilation_ticks(); 1668 progress = (ticks - thread_jvmci_compilation_ticks) != 0; 1669 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks); 1670 thread_jvmci_compilation_ticks = ticks; 1671 } else { 1672 // Still waiting on JVMCI compiler queue. This thread may be holding a lock 1673 // that all JVMCI compiler threads are blocked on. We use the global JVMCI 1674 // compilation ticks to determine whether JVMCI compilation 1675 // is still making progress through the JVMCI compiler queue. 1676 jint ticks = jvmci->global_compilation_ticks(); 1677 progress = (ticks - global_jvmci_compilation_ticks) != 0; 1678 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks); 1679 global_jvmci_compilation_ticks = ticks; 1680 } 1681 1682 if (!progress) { 1683 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) { 1684 if (PrintCompilation) { 1685 task->print(tty, "wait for blocking compilation timed out"); 1686 } 1687 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id()); 1688 break; 1689 } 1690 } else { 1691 progress_wait_attempts = 0; 1692 } 1693 } 1694 task->clear_waiter(); 1695 return task->is_complete(); 1696 } 1697 #endif 1698 1699 /** 1700 * Wait for the compilation task to complete. 1701 */ 1702 void CompileBroker::wait_for_completion(CompileTask* task) { 1703 if (CIPrintCompileQueue) { 1704 ttyLocker ttyl; 1705 tty->print_cr("BLOCKING FOR COMPILE"); 1706 } 1707 1708 assert(task->is_blocking(), "can only wait on blocking task"); 1709 1710 JavaThread* thread = JavaThread::current(); 1711 1712 methodHandle method(thread, task->method()); 1713 bool free_task; 1714 #if INCLUDE_JVMCI 1715 AbstractCompiler* comp = compiler(task->comp_level()); 1716 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) { 1717 // It may return before compilation is completed. 1718 // Note that libjvmci should not pre-emptively unblock 1719 // a thread waiting for a compilation as it does not call 1720 // Java code and so is not deadlock prone like jarjvmci. 1721 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread); 1722 } else 1723 #endif 1724 { 1725 MonitorLocker ml(thread, task->lock()); 1726 free_task = true; 1727 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1728 ml.wait(); 1729 } 1730 } 1731 1732 if (free_task) { 1733 if (is_compilation_disabled_forever()) { 1734 CompileTask::free(task); 1735 return; 1736 } 1737 1738 // It is harmless to check this status without the lock, because 1739 // completion is a stable property (until the task object is recycled). 1740 assert(task->is_complete(), "Compilation should have completed"); 1741 1742 // By convention, the waiter is responsible for recycling a 1743 // blocking CompileTask. Since there is only one waiter ever 1744 // waiting on a CompileTask, we know that no one else will 1745 // be using this CompileTask; we can free it. 1746 CompileTask::free(task); 1747 } 1748 } 1749 1750 /** 1751 * Initialize compiler thread(s) + compiler object(s). The postcondition 1752 * of this function is that the compiler runtimes are initialized and that 1753 * compiler threads can start compiling. 1754 */ 1755 bool CompileBroker::init_compiler_runtime() { 1756 CompilerThread* thread = CompilerThread::current(); 1757 AbstractCompiler* comp = thread->compiler(); 1758 // Final sanity check - the compiler object must exist 1759 guarantee(comp != nullptr, "Compiler object must exist"); 1760 1761 { 1762 // Must switch to native to allocate ci_env 1763 ThreadToNativeFromVM ttn(thread); 1764 ciEnv ci_env((CompileTask*)nullptr); 1765 // Cache Jvmti state 1766 ci_env.cache_jvmti_state(); 1767 // Cache DTrace flags 1768 ci_env.cache_dtrace_flags(); 1769 1770 // Switch back to VM state to do compiler initialization 1771 ThreadInVMfromNative tv(thread); 1772 1773 // Perform per-thread and global initializations 1774 comp->initialize(); 1775 } 1776 1777 if (comp->is_failed()) { 1778 disable_compilation_forever(); 1779 // If compiler initialization failed, no compiler thread that is specific to a 1780 // particular compiler runtime will ever start to compile methods. 1781 shutdown_compiler_runtime(comp, thread); 1782 return false; 1783 } 1784 1785 // C1 specific check 1786 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) { 1787 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1788 return false; 1789 } 1790 1791 return true; 1792 } 1793 1794 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) { 1795 BufferBlob* blob = thread->get_buffer_blob(); 1796 if (blob != nullptr) { 1797 blob->flush(); 1798 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1799 CodeCache::free(blob); 1800 } 1801 } 1802 1803 /** 1804 * If C1 and/or C2 initialization failed, we shut down all compilation. 1805 * We do this to keep things simple. This can be changed if it ever turns 1806 * out to be a problem. 1807 */ 1808 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1809 free_buffer_blob_if_allocated(thread); 1810 1811 if (comp->should_perform_shutdown()) { 1812 // There are two reasons for shutting down the compiler 1813 // 1) compiler runtime initialization failed 1814 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1815 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1816 1817 // Only one thread per compiler runtime object enters here 1818 // Set state to shut down 1819 comp->set_shut_down(); 1820 1821 // Delete all queued compilation tasks to make compiler threads exit faster. 1822 if (_c1_compile_queue != nullptr) { 1823 _c1_compile_queue->free_all(); 1824 } 1825 1826 if (_c2_compile_queue != nullptr) { 1827 _c2_compile_queue->free_all(); 1828 } 1829 1830 // Set flags so that we continue execution with using interpreter only. 1831 UseCompiler = false; 1832 UseInterpreter = true; 1833 1834 // We could delete compiler runtimes also. However, there are references to 1835 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1836 // fail. This can be done later if necessary. 1837 } 1838 } 1839 1840 /** 1841 * Helper function to create new or reuse old CompileLog. 1842 */ 1843 CompileLog* CompileBroker::get_log(CompilerThread* ct) { 1844 if (!LogCompilation) return nullptr; 1845 1846 AbstractCompiler *compiler = ct->compiler(); 1847 bool c1 = compiler->is_c1(); 1848 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects; 1849 assert(compiler_objects != nullptr, "must be initialized at this point"); 1850 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs; 1851 assert(logs != nullptr, "must be initialized at this point"); 1852 int count = c1 ? _c1_count : _c2_count; 1853 1854 // Find Compiler number by its threadObj. 1855 oop compiler_obj = ct->threadObj(); 1856 int compiler_number = 0; 1857 bool found = false; 1858 for (; compiler_number < count; compiler_number++) { 1859 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) { 1860 found = true; 1861 break; 1862 } 1863 } 1864 assert(found, "Compiler must exist at this point"); 1865 1866 // Determine pointer for this thread's log. 1867 CompileLog** log_ptr = &logs[compiler_number]; 1868 1869 // Return old one if it exists. 1870 CompileLog* log = *log_ptr; 1871 if (log != nullptr) { 1872 ct->init_log(log); 1873 return log; 1874 } 1875 1876 // Create a new one and remember it. 1877 init_compiler_thread_log(); 1878 log = ct->log(); 1879 *log_ptr = log; 1880 return log; 1881 } 1882 1883 // ------------------------------------------------------------------ 1884 // CompileBroker::compiler_thread_loop 1885 // 1886 // The main loop run by a CompilerThread. 1887 void CompileBroker::compiler_thread_loop() { 1888 CompilerThread* thread = CompilerThread::current(); 1889 CompileQueue* queue = thread->queue(); 1890 // For the thread that initializes the ciObjectFactory 1891 // this resource mark holds all the shared objects 1892 ResourceMark rm; 1893 1894 // First thread to get here will initialize the compiler interface 1895 1896 { 1897 ASSERT_IN_VM; 1898 MutexLocker only_one (thread, CompileThread_lock); 1899 if (!ciObjectFactory::is_initialized()) { 1900 ciObjectFactory::initialize(); 1901 } 1902 } 1903 1904 // Open a log. 1905 CompileLog* log = get_log(thread); 1906 if (log != nullptr) { 1907 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1908 thread->name(), 1909 os::current_thread_id(), 1910 os::current_process_id()); 1911 log->stamp(); 1912 log->end_elem(); 1913 } 1914 1915 // If compiler thread/runtime initialization fails, exit the compiler thread 1916 if (!init_compiler_runtime()) { 1917 return; 1918 } 1919 1920 thread->start_idle_timer(); 1921 1922 // Poll for new compilation tasks as long as the JVM runs. Compilation 1923 // should only be disabled if something went wrong while initializing the 1924 // compiler runtimes. This, in turn, should not happen. The only known case 1925 // when compiler runtime initialization fails is if there is not enough free 1926 // space in the code cache to generate the necessary stubs, etc. 1927 while (!is_compilation_disabled_forever()) { 1928 // We need this HandleMark to avoid leaking VM handles. 1929 HandleMark hm(thread); 1930 1931 CompileTask* task = queue->get(thread); 1932 if (task == nullptr) { 1933 if (UseDynamicNumberOfCompilerThreads) { 1934 // Access compiler_count under lock to enforce consistency. 1935 MutexLocker only_one(CompileThread_lock); 1936 if (can_remove(thread, true)) { 1937 if (trace_compiler_threads()) { 1938 ResourceMark rm; 1939 stringStream msg; 1940 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time", 1941 thread->name(), thread->idle_time_millis()); 1942 print_compiler_threads(msg); 1943 } 1944 1945 // Notify compiler that the compiler thread is about to stop 1946 thread->compiler()->stopping_compiler_thread(thread); 1947 1948 free_buffer_blob_if_allocated(thread); 1949 return; // Stop this thread. 1950 } 1951 } 1952 } else { 1953 // Assign the task to the current thread. Mark this compilation 1954 // thread as active for the profiler. 1955 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition 1956 // occurs after fetching the compile task off the queue. 1957 CompileTaskWrapper ctw(task); 1958 methodHandle method(thread, task->method()); 1959 1960 // Never compile a method if breakpoints are present in it 1961 if (method()->number_of_breakpoints() == 0) { 1962 // Compile the method. 1963 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1964 invoke_compiler_on_method(task); 1965 thread->start_idle_timer(); 1966 } else { 1967 // After compilation is disabled, remove remaining methods from queue 1968 method->clear_queued_for_compilation(); 1969 task->set_failure_reason("compilation is disabled"); 1970 } 1971 } else { 1972 task->set_failure_reason("breakpoints are present"); 1973 } 1974 1975 if (UseDynamicNumberOfCompilerThreads) { 1976 possibly_add_compiler_threads(thread); 1977 assert(!thread->has_pending_exception(), "should have been handled"); 1978 } 1979 } 1980 } 1981 1982 // Shut down compiler runtime 1983 shutdown_compiler_runtime(thread->compiler(), thread); 1984 } 1985 1986 // ------------------------------------------------------------------ 1987 // CompileBroker::init_compiler_thread_log 1988 // 1989 // Set up state required by +LogCompilation. 1990 void CompileBroker::init_compiler_thread_log() { 1991 CompilerThread* thread = CompilerThread::current(); 1992 char file_name[4*K]; 1993 FILE* fp = nullptr; 1994 intx thread_id = os::current_thread_id(); 1995 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1996 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr); 1997 if (dir == nullptr) { 1998 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1999 thread_id, os::current_process_id()); 2000 } else { 2001 jio_snprintf(file_name, sizeof(file_name), 2002 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 2003 os::file_separator(), thread_id, os::current_process_id()); 2004 } 2005 2006 fp = os::fopen(file_name, "wt"); 2007 if (fp != nullptr) { 2008 if (LogCompilation && Verbose) { 2009 tty->print_cr("Opening compilation log %s", file_name); 2010 } 2011 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id); 2012 if (log == nullptr) { 2013 fclose(fp); 2014 return; 2015 } 2016 thread->init_log(log); 2017 2018 if (xtty != nullptr) { 2019 ttyLocker ttyl; 2020 // Record any per thread log files 2021 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 2022 } 2023 return; 2024 } 2025 } 2026 warning("Cannot open log file: %s", file_name); 2027 } 2028 2029 void CompileBroker::log_metaspace_failure() { 2030 const char* message = "some methods may not be compiled because metaspace " 2031 "is out of memory"; 2032 if (CompilationLog::log() != nullptr) { 2033 CompilationLog::log()->log_metaspace_failure(message); 2034 } 2035 if (PrintCompilation) { 2036 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message); 2037 } 2038 } 2039 2040 2041 // ------------------------------------------------------------------ 2042 // CompileBroker::set_should_block 2043 // 2044 // Set _should_block. 2045 // Call this from the VM, with Threads_lock held and a safepoint requested. 2046 void CompileBroker::set_should_block() { 2047 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 2048 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 2049 #ifndef PRODUCT 2050 if (PrintCompilation && (Verbose || WizardMode)) 2051 tty->print_cr("notifying compiler thread pool to block"); 2052 #endif 2053 _should_block = true; 2054 } 2055 2056 // ------------------------------------------------------------------ 2057 // CompileBroker::maybe_block 2058 // 2059 // Call this from the compiler at convenient points, to poll for _should_block. 2060 void CompileBroker::maybe_block() { 2061 if (_should_block) { 2062 #ifndef PRODUCT 2063 if (PrintCompilation && (Verbose || WizardMode)) 2064 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 2065 #endif 2066 ThreadInVMfromNative tivfn(JavaThread::current()); 2067 } 2068 } 2069 2070 // wrapper for CodeCache::print_summary() 2071 static void codecache_print(bool detailed) 2072 { 2073 stringStream s; 2074 // Dump code cache into a buffer before locking the tty, 2075 { 2076 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2077 CodeCache::print_summary(&s, detailed); 2078 } 2079 ttyLocker ttyl; 2080 tty->print("%s", s.freeze()); 2081 } 2082 2083 // wrapper for CodeCache::print_summary() using outputStream 2084 static void codecache_print(outputStream* out, bool detailed) { 2085 stringStream s; 2086 2087 // Dump code cache into a buffer 2088 { 2089 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2090 CodeCache::print_summary(&s, detailed); 2091 } 2092 2093 char* remaining_log = s.as_string(); 2094 while (*remaining_log != '\0') { 2095 char* eol = strchr(remaining_log, '\n'); 2096 if (eol == nullptr) { 2097 out->print_cr("%s", remaining_log); 2098 remaining_log = remaining_log + strlen(remaining_log); 2099 } else { 2100 *eol = '\0'; 2101 out->print_cr("%s", remaining_log); 2102 remaining_log = eol + 1; 2103 } 2104 } 2105 } 2106 2107 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env, 2108 int compilable, const char* failure_reason) { 2109 if (!AbortVMOnCompilationFailure) { 2110 return; 2111 } 2112 if (compilable == ciEnv::MethodCompilable_not_at_tier) { 2113 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason); 2114 } 2115 if (compilable == ciEnv::MethodCompilable_never) { 2116 fatal("Never compilable: %s", failure_reason); 2117 } 2118 } 2119 2120 static void post_compilation_event(EventCompilation& event, CompileTask* task) { 2121 assert(task != nullptr, "invariant"); 2122 CompilerEvent::CompilationEvent::post(event, 2123 task->compile_id(), 2124 task->compiler()->type(), 2125 task->method(), 2126 task->comp_level(), 2127 task->is_success(), 2128 task->osr_bci() != CompileBroker::standard_entry_bci, 2129 task->nm_total_size(), 2130 task->num_inlined_bytecodes()); 2131 } 2132 2133 int DirectivesStack::_depth = 0; 2134 CompilerDirectives* DirectivesStack::_top = nullptr; 2135 CompilerDirectives* DirectivesStack::_bottom = nullptr; 2136 2137 // Acquires Compilation_lock and waits for it to be notified 2138 // as long as WhiteBox::compilation_locked is true. 2139 static void whitebox_lock_compilation() { 2140 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag); 2141 while (WhiteBox::compilation_locked) { 2142 locker.wait(); 2143 } 2144 } 2145 2146 // ------------------------------------------------------------------ 2147 // CompileBroker::invoke_compiler_on_method 2148 // 2149 // Compile a method. 2150 // 2151 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 2152 task->print_ul(); 2153 elapsedTimer time; 2154 2155 DirectiveSet* directive = task->directive(); 2156 if (directive->PrintCompilationOption) { 2157 ResourceMark rm; 2158 task->print_tty(); 2159 } 2160 2161 CompilerThread* thread = CompilerThread::current(); 2162 ResourceMark rm(thread); 2163 2164 if (CompilationLog::log() != nullptr) { 2165 CompilationLog::log()->log_compile(thread, task); 2166 } 2167 2168 // Common flags. 2169 int compile_id = task->compile_id(); 2170 int osr_bci = task->osr_bci(); 2171 bool is_osr = (osr_bci != standard_entry_bci); 2172 bool should_log = (thread->log() != nullptr); 2173 bool should_break = false; 2174 const int task_level = task->comp_level(); 2175 AbstractCompiler* comp = task->compiler(); 2176 { 2177 // create the handle inside it's own block so it can't 2178 // accidentally be referenced once the thread transitions to 2179 // native. The NoHandleMark before the transition should catch 2180 // any cases where this occurs in the future. 2181 methodHandle method(thread, task->method()); 2182 2183 assert(!method->is_native(), "no longer compile natives"); 2184 2185 // Update compile information when using perfdata. 2186 if (UsePerfData) { 2187 update_compile_perf_data(thread, method, is_osr); 2188 } 2189 2190 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 2191 } 2192 2193 should_break = directive->BreakAtCompileOption || task->check_break_at_flags(); 2194 if (should_log && !directive->LogOption) { 2195 should_log = false; 2196 } 2197 2198 // Allocate a new set of JNI handles. 2199 JNIHandleMark jhm(thread); 2200 Method* target_handle = task->method(); 2201 int compilable = ciEnv::MethodCompilable; 2202 const char* failure_reason = nullptr; 2203 bool failure_reason_on_C_heap = false; 2204 const char* retry_message = nullptr; 2205 2206 #if INCLUDE_JVMCI 2207 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) { 2208 JVMCICompiler* jvmci = (JVMCICompiler*) comp; 2209 2210 TraceTime t1("compilation", &time); 2211 EventCompilation event; 2212 JVMCICompileState compile_state(task, jvmci); 2213 JVMCIRuntime *runtime = nullptr; 2214 2215 if (JVMCI::in_shutdown()) { 2216 failure_reason = "in JVMCI shutdown"; 2217 retry_message = "not retryable"; 2218 compilable = ciEnv::MethodCompilable_never; 2219 } else if (compile_state.target_method_is_old()) { 2220 // Skip redefined methods 2221 failure_reason = "redefined method"; 2222 retry_message = "not retryable"; 2223 compilable = ciEnv::MethodCompilable_never; 2224 } else { 2225 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__); 2226 if (env.init_error() != JNI_OK) { 2227 const char* msg = env.init_error_msg(); 2228 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)", 2229 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI); 2230 bool reason_on_C_heap = true; 2231 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it 2232 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime. 2233 bool retryable = env.init_error() == JNI_ENOMEM; 2234 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap); 2235 } 2236 if (failure_reason == nullptr) { 2237 if (WhiteBoxAPI && WhiteBox::compilation_locked) { 2238 // Must switch to native to block 2239 ThreadToNativeFromVM ttn(thread); 2240 whitebox_lock_compilation(); 2241 } 2242 methodHandle method(thread, target_handle); 2243 runtime = env.runtime(); 2244 runtime->compile_method(&env, jvmci, method, osr_bci); 2245 2246 failure_reason = compile_state.failure_reason(); 2247 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap(); 2248 if (!compile_state.retryable()) { 2249 retry_message = "not retryable"; 2250 compilable = ciEnv::MethodCompilable_not_at_tier; 2251 } 2252 if (!task->is_success()) { 2253 assert(failure_reason != nullptr, "must specify failure_reason"); 2254 } 2255 } 2256 } 2257 if (!task->is_success() && !JVMCI::in_shutdown()) { 2258 handle_compile_error(thread, task, nullptr, compilable, failure_reason); 2259 } 2260 if (event.should_commit()) { 2261 post_compilation_event(event, task); 2262 } 2263 2264 if (runtime != nullptr) { 2265 runtime->post_compile(thread); 2266 } 2267 } else 2268 #endif // INCLUDE_JVMCI 2269 { 2270 NoHandleMark nhm; 2271 ThreadToNativeFromVM ttn(thread); 2272 2273 ciEnv ci_env(task); 2274 if (should_break) { 2275 ci_env.set_break_at_compile(true); 2276 } 2277 if (should_log) { 2278 ci_env.set_log(thread->log()); 2279 } 2280 assert(thread->env() == &ci_env, "set by ci_env"); 2281 // The thread-env() field is cleared in ~CompileTaskWrapper. 2282 2283 // Cache Jvmti state 2284 bool method_is_old = ci_env.cache_jvmti_state(); 2285 2286 // Skip redefined methods 2287 if (method_is_old) { 2288 ci_env.record_method_not_compilable("redefined method", true); 2289 } 2290 2291 // Cache DTrace flags 2292 ci_env.cache_dtrace_flags(); 2293 2294 ciMethod* target = ci_env.get_method_from_handle(target_handle); 2295 2296 TraceTime t1("compilation", &time); 2297 EventCompilation event; 2298 2299 if (comp == nullptr) { 2300 ci_env.record_method_not_compilable("no compiler"); 2301 } else if (!ci_env.failing()) { 2302 if (WhiteBoxAPI && WhiteBox::compilation_locked) { 2303 whitebox_lock_compilation(); 2304 } 2305 comp->compile_method(&ci_env, target, osr_bci, true, directive); 2306 2307 /* Repeat compilation without installing code for profiling purposes */ 2308 int repeat_compilation_count = directive->RepeatCompilationOption; 2309 while (repeat_compilation_count > 0) { 2310 ResourceMark rm(thread); 2311 task->print_ul("NO CODE INSTALLED"); 2312 comp->compile_method(&ci_env, target, osr_bci, false, directive); 2313 repeat_compilation_count--; 2314 } 2315 } 2316 2317 DirectivesStack::release(directive); 2318 2319 if (!ci_env.failing() && !task->is_success()) { 2320 assert(ci_env.failure_reason() != nullptr, "expect failure reason"); 2321 assert(false, "compiler should always document failure: %s", ci_env.failure_reason()); 2322 // The compiler elected, without comment, not to register a result. 2323 // Do not attempt further compilations of this method. 2324 ci_env.record_method_not_compilable("compile failed"); 2325 } 2326 2327 // Copy this bit to the enclosing block: 2328 compilable = ci_env.compilable(); 2329 2330 if (ci_env.failing()) { 2331 failure_reason = ci_env.failure_reason(); 2332 retry_message = ci_env.retry_message(); 2333 ci_env.report_failure(failure_reason); 2334 } 2335 2336 if (ci_env.failing()) { 2337 handle_compile_error(thread, task, &ci_env, compilable, failure_reason); 2338 } 2339 if (event.should_commit()) { 2340 post_compilation_event(event, task); 2341 } 2342 } 2343 2344 if (failure_reason != nullptr) { 2345 task->set_failure_reason(failure_reason, failure_reason_on_C_heap); 2346 if (CompilationLog::log() != nullptr) { 2347 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message); 2348 } 2349 if (PrintCompilation) { 2350 FormatBufferResource msg = retry_message != nullptr ? 2351 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) : 2352 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason); 2353 task->print(tty, msg); 2354 } 2355 } 2356 2357 methodHandle method(thread, task->method()); 2358 2359 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2360 2361 collect_statistics(thread, time, task); 2362 2363 if (PrintCompilation && PrintCompilation2) { 2364 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2365 tty->print("%4d ", compile_id); // print compilation number 2366 tty->print("%s ", (is_osr ? "%" : " ")); 2367 if (task->is_success()) { 2368 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size()); 2369 } 2370 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2371 } 2372 2373 Log(compilation, codecache) log; 2374 if (log.is_debug()) { 2375 LogStream ls(log.debug()); 2376 codecache_print(&ls, /* detailed= */ false); 2377 } 2378 if (PrintCodeCacheOnCompilation) { 2379 codecache_print(/* detailed= */ false); 2380 } 2381 // Disable compilation, if required. 2382 switch (compilable) { 2383 case ciEnv::MethodCompilable_never: 2384 if (is_osr) 2385 method->set_not_osr_compilable_quietly("MethodCompilable_never"); 2386 else 2387 method->set_not_compilable_quietly("MethodCompilable_never"); 2388 break; 2389 case ciEnv::MethodCompilable_not_at_tier: 2390 if (is_osr) 2391 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2392 else 2393 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2394 break; 2395 } 2396 2397 // Note that the queued_for_compilation bits are cleared without 2398 // protection of a mutex. [They were set by the requester thread, 2399 // when adding the task to the compile queue -- at which time the 2400 // compile queue lock was held. Subsequently, we acquired the compile 2401 // queue lock to get this task off the compile queue; thus (to belabour 2402 // the point somewhat) our clearing of the bits must be occurring 2403 // only after the setting of the bits. See also 14012000 above. 2404 method->clear_queued_for_compilation(); 2405 } 2406 2407 /** 2408 * The CodeCache is full. Print warning and disable compilation. 2409 * Schedule code cache cleaning so compilation can continue later. 2410 * This function needs to be called only from CodeCache::allocate(), 2411 * since we currently handle a full code cache uniformly. 2412 */ 2413 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) { 2414 UseInterpreter = true; 2415 if (UseCompiler || AlwaysCompileLoopMethods ) { 2416 if (xtty != nullptr) { 2417 stringStream s; 2418 // Dump code cache state into a buffer before locking the tty, 2419 // because log_state() will use locks causing lock conflicts. 2420 CodeCache::log_state(&s); 2421 // Lock to prevent tearing 2422 ttyLocker ttyl; 2423 xtty->begin_elem("code_cache_full"); 2424 xtty->print("%s", s.freeze()); 2425 xtty->stamp(); 2426 xtty->end_elem(); 2427 } 2428 2429 #ifndef PRODUCT 2430 if (ExitOnFullCodeCache) { 2431 codecache_print(/* detailed= */ true); 2432 before_exit(JavaThread::current()); 2433 exit_globals(); // will delete tty 2434 vm_direct_exit(1); 2435 } 2436 #endif 2437 if (UseCodeCacheFlushing) { 2438 // Since code cache is full, immediately stop new compiles 2439 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2440 log_info(codecache)("Code cache is full - disabling compilation"); 2441 } 2442 } else { 2443 disable_compilation_forever(); 2444 } 2445 2446 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning()); 2447 } 2448 } 2449 2450 // ------------------------------------------------------------------ 2451 // CompileBroker::update_compile_perf_data 2452 // 2453 // Record this compilation for debugging purposes. 2454 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) { 2455 ResourceMark rm; 2456 char* method_name = method->name()->as_C_string(); 2457 char current_method[CompilerCounters::cmname_buffer_length]; 2458 size_t maxLen = CompilerCounters::cmname_buffer_length; 2459 2460 const char* class_name = method->method_holder()->name()->as_C_string(); 2461 2462 size_t s1len = strlen(class_name); 2463 size_t s2len = strlen(method_name); 2464 2465 // check if we need to truncate the string 2466 if (s1len + s2len + 2 > maxLen) { 2467 2468 // the strategy is to lop off the leading characters of the 2469 // class name and the trailing characters of the method name. 2470 2471 if (s2len + 2 > maxLen) { 2472 // lop of the entire class name string, let snprintf handle 2473 // truncation of the method name. 2474 class_name += s1len; // null string 2475 } 2476 else { 2477 // lop off the extra characters from the front of the class name 2478 class_name += ((s1len + s2len + 2) - maxLen); 2479 } 2480 } 2481 2482 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2483 2484 int last_compile_type = normal_compile; 2485 if (CICountOSR && is_osr) { 2486 last_compile_type = osr_compile; 2487 } else if (CICountNative && method->is_native()) { 2488 last_compile_type = native_compile; 2489 } 2490 2491 CompilerCounters* counters = thread->counters(); 2492 counters->set_current_method(current_method); 2493 counters->set_compile_type((jlong) last_compile_type); 2494 } 2495 2496 // ------------------------------------------------------------------ 2497 // CompileBroker::collect_statistics 2498 // 2499 // Collect statistics about the compilation. 2500 2501 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2502 bool success = task->is_success(); 2503 methodHandle method (thread, task->method()); 2504 int compile_id = task->compile_id(); 2505 bool is_osr = (task->osr_bci() != standard_entry_bci); 2506 const int comp_level = task->comp_level(); 2507 CompilerCounters* counters = thread->counters(); 2508 2509 MutexLocker locker(CompileStatistics_lock); 2510 2511 // _perf variables are production performance counters which are 2512 // updated regardless of the setting of the CITime and CITimeEach flags 2513 // 2514 2515 // account all time, including bailouts and failures in this counter; 2516 // C1 and C2 counters are counting both successful and unsuccessful compiles 2517 _t_total_compilation.add(time); 2518 2519 if (!success) { 2520 _total_bailout_count++; 2521 if (UsePerfData) { 2522 _perf_last_failed_method->set_value(counters->current_method()); 2523 _perf_last_failed_type->set_value(counters->compile_type()); 2524 _perf_total_bailout_count->inc(); 2525 } 2526 _t_bailedout_compilation.add(time); 2527 } else if (!task->is_success()) { 2528 if (UsePerfData) { 2529 _perf_last_invalidated_method->set_value(counters->current_method()); 2530 _perf_last_invalidated_type->set_value(counters->compile_type()); 2531 _perf_total_invalidated_count->inc(); 2532 } 2533 _total_invalidated_count++; 2534 _t_invalidated_compilation.add(time); 2535 } else { 2536 // Compilation succeeded 2537 2538 // update compilation ticks - used by the implementation of 2539 // java.lang.management.CompilationMXBean 2540 _perf_total_compilation->inc(time.ticks()); 2541 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2542 2543 if (CITime) { 2544 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes(); 2545 if (is_osr) { 2546 _t_osr_compilation.add(time); 2547 _sum_osr_bytes_compiled += bytes_compiled; 2548 } else { 2549 _t_standard_compilation.add(time); 2550 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2551 } 2552 2553 // Collect statistic per compilation level 2554 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) { 2555 CompilerStatistics* stats = &_stats_per_level[comp_level-1]; 2556 if (is_osr) { 2557 stats->_osr.update(time, bytes_compiled); 2558 } else { 2559 stats->_standard.update(time, bytes_compiled); 2560 } 2561 stats->_nmethods_size += task->nm_total_size(); 2562 stats->_nmethods_code_size += task->nm_insts_size(); 2563 } else { 2564 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level); 2565 } 2566 2567 // Collect statistic per compiler 2568 AbstractCompiler* comp = compiler(comp_level); 2569 if (comp) { 2570 CompilerStatistics* stats = comp->stats(); 2571 if (is_osr) { 2572 stats->_osr.update(time, bytes_compiled); 2573 } else { 2574 stats->_standard.update(time, bytes_compiled); 2575 } 2576 stats->_nmethods_size += task->nm_total_size(); 2577 stats->_nmethods_code_size += task->nm_insts_size(); 2578 } else { // if (!comp) 2579 assert(false, "Compiler object must exist"); 2580 } 2581 } 2582 2583 if (UsePerfData) { 2584 // save the name of the last method compiled 2585 _perf_last_method->set_value(counters->current_method()); 2586 _perf_last_compile_type->set_value(counters->compile_type()); 2587 _perf_last_compile_size->set_value(method->code_size() + 2588 task->num_inlined_bytecodes()); 2589 if (is_osr) { 2590 _perf_osr_compilation->inc(time.ticks()); 2591 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2592 } else { 2593 _perf_standard_compilation->inc(time.ticks()); 2594 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2595 } 2596 } 2597 2598 if (CITimeEach) { 2599 double compile_time = time.seconds(); 2600 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time; 2601 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)", 2602 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2603 } 2604 2605 // Collect counts of successful compilations 2606 _sum_nmethod_size += task->nm_total_size(); 2607 _sum_nmethod_code_size += task->nm_insts_size(); 2608 _total_compile_count++; 2609 2610 if (UsePerfData) { 2611 _perf_sum_nmethod_size->inc( task->nm_total_size()); 2612 _perf_sum_nmethod_code_size->inc(task->nm_insts_size()); 2613 _perf_total_compile_count->inc(); 2614 } 2615 2616 if (is_osr) { 2617 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2618 _total_osr_compile_count++; 2619 } else { 2620 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2621 _total_standard_compile_count++; 2622 } 2623 } 2624 // set the current method for the thread to null 2625 if (UsePerfData) counters->set_current_method(""); 2626 } 2627 2628 const char* CompileBroker::compiler_name(int comp_level) { 2629 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2630 if (comp == nullptr) { 2631 return "no compiler"; 2632 } else { 2633 return (comp->name()); 2634 } 2635 } 2636 2637 jlong CompileBroker::total_compilation_ticks() { 2638 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0; 2639 } 2640 2641 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) { 2642 tty->print_cr(" %s {speed: %6.3f bytes/s; standard: %6.3f s, %u bytes, %u methods; osr: %6.3f s, %u bytes, %u methods; nmethods_size: %u bytes; nmethods_code_size: %u bytes}", 2643 name, stats->bytes_per_second(), 2644 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count, 2645 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count, 2646 stats->_nmethods_size, stats->_nmethods_code_size); 2647 } 2648 2649 void CompileBroker::print_times(bool per_compiler, bool aggregate) { 2650 if (per_compiler) { 2651 if (aggregate) { 2652 tty->cr(); 2653 tty->print_cr("Individual compiler times (for compiled methods only)"); 2654 tty->print_cr("------------------------------------------------"); 2655 tty->cr(); 2656 } 2657 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) { 2658 AbstractCompiler* comp = _compilers[i]; 2659 if (comp != nullptr) { 2660 print_times(comp->name(), comp->stats()); 2661 } 2662 } 2663 if (aggregate) { 2664 tty->cr(); 2665 tty->print_cr("Individual compilation Tier times (for compiled methods only)"); 2666 tty->print_cr("------------------------------------------------"); 2667 tty->cr(); 2668 } 2669 char tier_name[256]; 2670 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) { 2671 CompilerStatistics* stats = &_stats_per_level[tier-1]; 2672 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier); 2673 print_times(tier_name, stats); 2674 } 2675 } 2676 2677 if (!aggregate) { 2678 return; 2679 } 2680 2681 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation; 2682 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation; 2683 elapsedTimer total_compilation = CompileBroker::_t_total_compilation; 2684 2685 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled; 2686 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled; 2687 2688 uint standard_compile_count = CompileBroker::_total_standard_compile_count; 2689 uint osr_compile_count = CompileBroker::_total_osr_compile_count; 2690 uint total_compile_count = CompileBroker::_total_compile_count; 2691 uint total_bailout_count = CompileBroker::_total_bailout_count; 2692 uint total_invalidated_count = CompileBroker::_total_invalidated_count; 2693 2694 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size; 2695 uint nmethods_size = CompileBroker::_sum_nmethod_size; 2696 2697 tty->cr(); 2698 tty->print_cr("Accumulated compiler times"); 2699 tty->print_cr("----------------------------------------------------------"); 2700 //0000000000111111111122222222223333333333444444444455555555556666666666 2701 //0123456789012345678901234567890123456789012345678901234567890123456789 2702 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds()); 2703 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s", 2704 standard_compilation.seconds(), 2705 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count); 2706 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s", 2707 CompileBroker::_t_bailedout_compilation.seconds(), 2708 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count); 2709 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s", 2710 osr_compilation.seconds(), 2711 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count); 2712 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s", 2713 CompileBroker::_t_invalidated_compilation.seconds(), 2714 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count); 2715 2716 AbstractCompiler *comp = compiler(CompLevel_simple); 2717 if (comp != nullptr) { 2718 tty->cr(); 2719 comp->print_timers(); 2720 } 2721 comp = compiler(CompLevel_full_optimization); 2722 if (comp != nullptr) { 2723 tty->cr(); 2724 comp->print_timers(); 2725 } 2726 #if INCLUDE_JVMCI 2727 if (EnableJVMCI) { 2728 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null()); 2729 if (jvmci_comp != nullptr && jvmci_comp != comp) { 2730 tty->cr(); 2731 jvmci_comp->print_timers(); 2732 } 2733 } 2734 #endif 2735 2736 tty->cr(); 2737 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count); 2738 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count); 2739 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count); 2740 uint tcb = osr_bytes_compiled + standard_bytes_compiled; 2741 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb); 2742 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled); 2743 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled); 2744 double tcs = total_compilation.seconds(); 2745 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs); 2746 tty->print_cr(" Average compilation speed : %8u bytes/s", bps); 2747 tty->cr(); 2748 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size); 2749 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size); 2750 } 2751 2752 // Print general/accumulated JIT information. 2753 void CompileBroker::print_info(outputStream *out) { 2754 if (out == nullptr) out = tty; 2755 out->cr(); 2756 out->print_cr("======================"); 2757 out->print_cr(" General JIT info "); 2758 out->print_cr("======================"); 2759 out->cr(); 2760 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off"); 2761 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount); 2762 out->cr(); 2763 out->print_cr("CodeCache overview"); 2764 out->print_cr("--------------------------------------------------------"); 2765 out->cr(); 2766 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K); 2767 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K); 2768 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K); 2769 out->cr(); 2770 } 2771 2772 // Note: tty_lock must not be held upon entry to this function. 2773 // Print functions called from herein do "micro-locking" on tty_lock. 2774 // That's a tradeoff which keeps together important blocks of output. 2775 // At the same time, continuous tty_lock hold time is kept in check, 2776 // preventing concurrently printing threads from stalling a long time. 2777 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) { 2778 TimeStamp ts_total; 2779 TimeStamp ts_global; 2780 TimeStamp ts; 2781 2782 bool allFun = !strcmp(function, "all"); 2783 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun; 2784 bool usedSpace = !strcmp(function, "UsedSpace") || allFun; 2785 bool freeSpace = !strcmp(function, "FreeSpace") || allFun; 2786 bool methodCount = !strcmp(function, "MethodCount") || allFun; 2787 bool methodSpace = !strcmp(function, "MethodSpace") || allFun; 2788 bool methodAge = !strcmp(function, "MethodAge") || allFun; 2789 bool methodNames = !strcmp(function, "MethodNames") || allFun; 2790 bool discard = !strcmp(function, "discard") || allFun; 2791 2792 if (out == nullptr) { 2793 out = tty; 2794 } 2795 2796 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) { 2797 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function); 2798 out->cr(); 2799 return; 2800 } 2801 2802 ts_total.update(); // record starting point 2803 2804 if (aggregate) { 2805 print_info(out); 2806 } 2807 2808 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function. 2809 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap. 2810 // When we request individual parts of the analysis via the jcmd interface, it is possible 2811 // that in between another thread (another jcmd user or the vm running into CodeCache OOM) 2812 // updated the aggregated data. We will then see a modified, but again consistent, view 2813 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold 2814 // a lock across user interaction. 2815 2816 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock. 2817 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time, 2818 // leading to an unnecessarily long hold time of the other locks we acquired before. 2819 ts.update(); // record starting point 2820 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag); 2821 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds()); 2822 2823 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache. 2824 // Unfortunately, such protection is not sufficient: 2825 // When a new nmethod is created via ciEnv::register_method(), the 2826 // Compile_lock is taken first. After some initializations, 2827 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock 2828 // immediately (after finalizing the oop references). To lock out concurrent 2829 // modifiers, we have to grab both locks as well in the described sequence. 2830 // 2831 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock 2832 // for the entire duration of aggregation and printing. That makes sure we see 2833 // a consistent picture and do not run into issues caused by concurrent alterations. 2834 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() && 2835 !Compile_lock->owned_by_self(); 2836 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() && 2837 !CodeCache_lock->owned_by_self(); 2838 bool take_global_lock_1 = allFun && should_take_Compile_lock; 2839 bool take_global_lock_2 = allFun && should_take_CodeCache_lock; 2840 bool take_function_lock_1 = !allFun && should_take_Compile_lock; 2841 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock; 2842 bool take_global_locks = take_global_lock_1 || take_global_lock_2; 2843 bool take_function_locks = take_function_lock_1 || take_function_lock_2; 2844 2845 ts_global.update(); // record starting point 2846 2847 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag); 2848 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag); 2849 if (take_global_locks) { 2850 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds()); 2851 ts_global.update(); // record starting point 2852 } 2853 2854 if (aggregate) { 2855 ts.update(); // record starting point 2856 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag); 2857 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag); 2858 if (take_function_locks) { 2859 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds()); 2860 } 2861 2862 ts.update(); // record starting point 2863 CodeCache::aggregate(out, granularity); 2864 if (take_function_locks) { 2865 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds()); 2866 } 2867 } 2868 2869 if (usedSpace) CodeCache::print_usedSpace(out); 2870 if (freeSpace) CodeCache::print_freeSpace(out); 2871 if (methodCount) CodeCache::print_count(out); 2872 if (methodSpace) CodeCache::print_space(out); 2873 if (methodAge) CodeCache::print_age(out); 2874 if (methodNames) { 2875 if (allFun) { 2876 // print_names() can only be used safely if the locks have been continuously held 2877 // since aggregation begin. That is true only for function "all". 2878 CodeCache::print_names(out); 2879 } else { 2880 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'"); 2881 } 2882 } 2883 if (discard) CodeCache::discard(out); 2884 2885 if (take_global_locks) { 2886 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds()); 2887 } 2888 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds()); 2889 }