1 /* 2 * Copyright (c) 1999, 2020, 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 "jvm.h" 27 #include "classfile/symbolTable.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/codeCache.hpp" 31 #include "code/codeHeapState.hpp" 32 #include "code/dependencyContext.hpp" 33 #include "compiler/compilationPolicy.hpp" 34 #include "compiler/compileBroker.hpp" 35 #include "compiler/compileLog.hpp" 36 #include "compiler/compilerEvent.hpp" 37 #include "compiler/compilerOracle.hpp" 38 #include "compiler/directivesParser.hpp" 39 #include "interpreter/linkResolver.hpp" 40 #include "jfr/jfrEvents.hpp" 41 #include "logging/log.hpp" 42 #include "logging/logStream.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/resourceArea.hpp" 45 #include "memory/universe.hpp" 46 #include "oops/methodData.hpp" 47 #include "oops/method.inline.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "prims/nativeLookup.hpp" 50 #include "prims/whitebox.hpp" 51 #include "runtime/arguments.hpp" 52 #include "runtime/atomic.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/init.hpp" 55 #include "runtime/interfaceSupport.inline.hpp" 56 #include "runtime/javaCalls.hpp" 57 #include "runtime/jniHandles.inline.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepointVerifiers.hpp" 60 #include "runtime/sharedRuntime.hpp" 61 #include "runtime/sweeper.hpp" 62 #include "runtime/timerTrace.hpp" 63 #include "runtime/vframe.inline.hpp" 64 #include "utilities/debug.hpp" 65 #include "utilities/dtrace.hpp" 66 #include "utilities/events.hpp" 67 #include "utilities/formatBuffer.hpp" 68 #include "utilities/macros.hpp" 69 #ifdef COMPILER1 70 #include "c1/c1_Compiler.hpp" 71 #endif 72 #if INCLUDE_JVMCI 73 #include "jvmci/jvmciEnv.hpp" 74 #include "jvmci/jvmciRuntime.hpp" 75 #endif 76 #ifdef COMPILER2 77 #include "opto/c2compiler.hpp" 78 #endif 79 80 #ifdef DTRACE_ENABLED 81 82 // Only bother with this argument setup if dtrace is available 83 84 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 85 { \ 86 Symbol* klass_name = (method)->klass_name(); \ 87 Symbol* name = (method)->name(); \ 88 Symbol* signature = (method)->signature(); \ 89 HOTSPOT_METHOD_COMPILE_BEGIN( \ 90 (char *) comp_name, strlen(comp_name), \ 91 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 92 (char *) name->bytes(), name->utf8_length(), \ 93 (char *) signature->bytes(), signature->utf8_length()); \ 94 } 95 96 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 97 { \ 98 Symbol* klass_name = (method)->klass_name(); \ 99 Symbol* name = (method)->name(); \ 100 Symbol* signature = (method)->signature(); \ 101 HOTSPOT_METHOD_COMPILE_END( \ 102 (char *) comp_name, strlen(comp_name), \ 103 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 104 (char *) name->bytes(), name->utf8_length(), \ 105 (char *) signature->bytes(), signature->utf8_length(), (success)); \ 106 } 107 108 #else // ndef DTRACE_ENABLED 109 110 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 111 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 112 113 #endif // ndef DTRACE_ENABLED 114 115 bool CompileBroker::_initialized = false; 116 volatile bool CompileBroker::_should_block = false; 117 volatile int CompileBroker::_print_compilation_warning = 0; 118 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 119 120 // The installed compiler(s) 121 AbstractCompiler* CompileBroker::_compilers[2]; 122 123 // The maximum numbers of compiler threads to be determined during startup. 124 int CompileBroker::_c1_count = 0; 125 int CompileBroker::_c2_count = 0; 126 127 // An array of compiler names as Java String objects 128 jobject* CompileBroker::_compiler1_objects = NULL; 129 jobject* CompileBroker::_compiler2_objects = NULL; 130 131 CompileLog** CompileBroker::_compiler1_logs = NULL; 132 CompileLog** CompileBroker::_compiler2_logs = NULL; 133 134 // These counters are used to assign an unique ID to each compilation. 135 volatile jint CompileBroker::_compilation_id = 0; 136 volatile jint CompileBroker::_osr_compilation_id = 0; 137 138 // Performance counters 139 PerfCounter* CompileBroker::_perf_total_compilation = NULL; 140 PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 141 PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 142 143 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 144 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 145 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 146 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 147 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 148 149 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 150 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 151 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 152 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 153 154 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 155 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 156 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 157 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 158 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 159 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 160 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 161 162 // Timers and counters for generating statistics 163 elapsedTimer CompileBroker::_t_total_compilation; 164 elapsedTimer CompileBroker::_t_osr_compilation; 165 elapsedTimer CompileBroker::_t_standard_compilation; 166 elapsedTimer CompileBroker::_t_invalidated_compilation; 167 elapsedTimer CompileBroker::_t_bailedout_compilation; 168 169 int CompileBroker::_total_bailout_count = 0; 170 int CompileBroker::_total_invalidated_count = 0; 171 int CompileBroker::_total_compile_count = 0; 172 int CompileBroker::_total_osr_compile_count = 0; 173 int CompileBroker::_total_standard_compile_count = 0; 174 int CompileBroker::_total_compiler_stopped_count = 0; 175 int CompileBroker::_total_compiler_restarted_count = 0; 176 177 int CompileBroker::_sum_osr_bytes_compiled = 0; 178 int CompileBroker::_sum_standard_bytes_compiled = 0; 179 int CompileBroker::_sum_nmethod_size = 0; 180 int CompileBroker::_sum_nmethod_code_size = 0; 181 182 long CompileBroker::_peak_compilation_time = 0; 183 184 CompileQueue* CompileBroker::_c2_compile_queue = NULL; 185 CompileQueue* CompileBroker::_c1_compile_queue = NULL; 186 187 188 189 class CompilationLog : public StringEventLog { 190 public: 191 CompilationLog() : StringEventLog("Compilation events", "jit") { 192 } 193 194 void log_compile(JavaThread* thread, CompileTask* task) { 195 StringLogMessage lm; 196 stringStream sstr(lm.buffer(), lm.size()); 197 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 198 task->print(&sstr, NULL, true, false); 199 log(thread, "%s", (const char*)lm); 200 } 201 202 void log_nmethod(JavaThread* thread, nmethod* nm) { 203 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", 204 nm->compile_id(), nm->is_osr_method() ? "%" : "", 205 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end())); 206 } 207 208 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 209 StringLogMessage lm; 210 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 211 if (retry_message != NULL) { 212 lm.append(" (%s)", retry_message); 213 } 214 lm.print("\n"); 215 log(thread, "%s", (const char*)lm); 216 } 217 218 void log_metaspace_failure(const char* reason) { 219 ResourceMark rm; 220 StringLogMessage lm; 221 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason); 222 lm.print("\n"); 223 log(JavaThread::current(), "%s", (const char*)lm); 224 } 225 }; 226 227 static CompilationLog* _compilation_log = NULL; 228 229 bool compileBroker_init() { 230 if (LogEvents) { 231 _compilation_log = new CompilationLog(); 232 } 233 234 // init directives stack, adding default directive 235 DirectivesStack::init(); 236 237 if (DirectivesParser::has_file()) { 238 return DirectivesParser::parse_from_flag(); 239 } else if (CompilerDirectivesPrint) { 240 // Print default directive even when no other was added 241 DirectivesStack::print(tty); 242 } 243 244 return true; 245 } 246 247 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 248 CompilerThread* thread = CompilerThread::current(); 249 thread->set_task(task); 250 #if INCLUDE_JVMCI 251 if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) { 252 task->set_jvmci_compiler_thread(thread); 253 } 254 #endif 255 CompileLog* log = thread->log(); 256 if (log != NULL && !task->is_unloaded()) task->log_task_start(log); 257 } 258 259 CompileTaskWrapper::~CompileTaskWrapper() { 260 CompilerThread* thread = CompilerThread::current(); 261 CompileTask* task = thread->task(); 262 CompileLog* log = thread->log(); 263 if (log != NULL && !task->is_unloaded()) task->log_task_done(log); 264 thread->set_task(NULL); 265 task->set_code_handle(NULL); 266 thread->set_env(NULL); 267 if (task->is_blocking()) { 268 bool free_task = false; 269 { 270 MutexLocker notifier(thread, task->lock()); 271 task->mark_complete(); 272 #if INCLUDE_JVMCI 273 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) { 274 if (!task->has_waiter()) { 275 // The waiting thread timed out and thus did not free the task. 276 free_task = true; 277 } 278 task->set_jvmci_compiler_thread(NULL); 279 } 280 #endif 281 if (!free_task) { 282 // Notify the waiting thread that the compilation has completed 283 // so that it can free the task. 284 task->lock()->notify_all(); 285 } 286 } 287 if (free_task) { 288 // The task can only be freed once the task lock is released. 289 CompileTask::free(task); 290 } 291 } else { 292 task->mark_complete(); 293 294 // By convention, the compiling thread is responsible for 295 // recycling a non-blocking CompileTask. 296 CompileTask::free(task); 297 } 298 } 299 300 /** 301 * Check if a CompilerThread can be removed and update count if requested. 302 */ 303 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) { 304 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here"); 305 if (!ReduceNumberOfCompilerThreads) return false; 306 307 AbstractCompiler *compiler = ct->compiler(); 308 int compiler_count = compiler->num_compiler_threads(); 309 bool c1 = compiler->is_c1(); 310 311 // Keep at least 1 compiler thread of each type. 312 if (compiler_count < 2) return false; 313 314 // Keep thread alive for at least some time. 315 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false; 316 317 #if INCLUDE_JVMCI 318 if (compiler->is_jvmci()) { 319 // Handles for JVMCI thread objects may get released concurrently. 320 if (do_it) { 321 assert(CompileThread_lock->owner() == ct, "must be holding lock"); 322 } else { 323 // Skip check if it's the last thread and let caller check again. 324 return true; 325 } 326 } 327 #endif 328 329 // We only allow the last compiler thread of each type to get removed. 330 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1) 331 : compiler2_object(compiler_count - 1); 332 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) { 333 if (do_it) { 334 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent. 335 compiler->set_num_compiler_threads(compiler_count - 1); 336 #if INCLUDE_JVMCI 337 if (compiler->is_jvmci()) { 338 // Old j.l.Thread object can die when no longer referenced elsewhere. 339 JNIHandles::destroy_global(compiler2_object(compiler_count - 1)); 340 _compiler2_objects[compiler_count - 1] = NULL; 341 } 342 #endif 343 } 344 return true; 345 } 346 return false; 347 } 348 349 /** 350 * Add a CompileTask to a CompileQueue. 351 */ 352 void CompileQueue::add(CompileTask* task) { 353 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 354 355 task->set_next(NULL); 356 task->set_prev(NULL); 357 358 if (_last == NULL) { 359 // The compile queue is empty. 360 assert(_first == NULL, "queue is empty"); 361 _first = task; 362 _last = task; 363 } else { 364 // Append the task to the queue. 365 assert(_last->next() == NULL, "not last"); 366 _last->set_next(task); 367 task->set_prev(_last); 368 _last = task; 369 } 370 ++_size; 371 372 // Mark the method as being in the compile queue. 373 task->method()->set_queued_for_compilation(); 374 375 if (CIPrintCompileQueue) { 376 print_tty(); 377 } 378 379 if (LogCompilation && xtty != NULL) { 380 task->log_task_queued(); 381 } 382 383 // Notify CompilerThreads that a task is available. 384 MethodCompileQueue_lock->notify_all(); 385 } 386 387 /** 388 * Empties compilation queue by putting all compilation tasks onto 389 * a freelist. Furthermore, the method wakes up all threads that are 390 * waiting on a compilation task to finish. This can happen if background 391 * compilation is disabled. 392 */ 393 void CompileQueue::free_all() { 394 MutexLocker mu(MethodCompileQueue_lock); 395 CompileTask* next = _first; 396 397 // Iterate over all tasks in the compile queue 398 while (next != NULL) { 399 CompileTask* current = next; 400 next = current->next(); 401 { 402 // Wake up thread that blocks on the compile task. 403 MutexLocker ct_lock(current->lock()); 404 current->lock()->notify(); 405 } 406 // Put the task back on the freelist. 407 CompileTask::free(current); 408 } 409 _first = NULL; 410 411 // Wake up all threads that block on the queue. 412 MethodCompileQueue_lock->notify_all(); 413 } 414 415 /** 416 * Get the next CompileTask from a CompileQueue 417 */ 418 CompileTask* CompileQueue::get() { 419 // save methods from RedefineClasses across safepoint 420 // across MethodCompileQueue_lock below. 421 methodHandle save_method; 422 methodHandle save_hot_method; 423 424 MonitorLocker locker(MethodCompileQueue_lock); 425 // If _first is NULL we have no more compile jobs. There are two reasons for 426 // having no compile jobs: First, we compiled everything we wanted. Second, 427 // we ran out of code cache so compilation has been disabled. In the latter 428 // case we perform code cache sweeps to free memory such that we can re-enable 429 // compilation. 430 while (_first == NULL) { 431 // Exit loop if compilation is disabled forever 432 if (CompileBroker::is_compilation_disabled_forever()) { 433 return NULL; 434 } 435 436 // If there are no compilation tasks and we can compile new jobs 437 // (i.e., there is enough free space in the code cache) there is 438 // no need to invoke the sweeper. As a result, the hotness of methods 439 // remains unchanged. This behavior is desired, since we want to keep 440 // the stable state, i.e., we do not want to evict methods from the 441 // code cache if it is unnecessary. 442 // We need a timed wait here, since compiler threads can exit if compilation 443 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 444 // is not critical and we do not want idle compiler threads to wake up too often. 445 locker.wait(5*1000); 446 447 if (UseDynamicNumberOfCompilerThreads && _first == NULL) { 448 // Still nothing to compile. Give caller a chance to stop this thread. 449 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL; 450 } 451 } 452 453 if (CompileBroker::is_compilation_disabled_forever()) { 454 return NULL; 455 } 456 457 CompileTask* task; 458 { 459 NoSafepointVerifier nsv; 460 task = CompilationPolicy::policy()->select_task(this); 461 if (task != NULL) { 462 task = task->select_for_compilation(); 463 } 464 } 465 466 if (task != NULL) { 467 // Save method pointers across unlock safepoint. The task is removed from 468 // the compilation queue, which is walked during RedefineClasses. 469 Thread* thread = Thread::current(); 470 save_method = methodHandle(thread, task->method()); 471 save_hot_method = methodHandle(thread, task->hot_method()); 472 473 remove(task); 474 } 475 purge_stale_tasks(); // may temporarily release MCQ lock 476 return task; 477 } 478 479 // Clean & deallocate stale compile tasks. 480 // Temporarily releases MethodCompileQueue lock. 481 void CompileQueue::purge_stale_tasks() { 482 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 483 if (_first_stale != NULL) { 484 // Stale tasks are purged when MCQ lock is released, 485 // but _first_stale updates are protected by MCQ lock. 486 // Once task processing starts and MCQ lock is released, 487 // other compiler threads can reuse _first_stale. 488 CompileTask* head = _first_stale; 489 _first_stale = NULL; 490 { 491 MutexUnlocker ul(MethodCompileQueue_lock); 492 for (CompileTask* task = head; task != NULL; ) { 493 CompileTask* next_task = task->next(); 494 CompileTaskWrapper ctw(task); // Frees the task 495 task->set_failure_reason("stale task"); 496 task = next_task; 497 } 498 } 499 } 500 } 501 502 void CompileQueue::remove(CompileTask* task) { 503 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 504 if (task->prev() != NULL) { 505 task->prev()->set_next(task->next()); 506 } else { 507 // max is the first element 508 assert(task == _first, "Sanity"); 509 _first = task->next(); 510 } 511 512 if (task->next() != NULL) { 513 task->next()->set_prev(task->prev()); 514 } else { 515 // max is the last element 516 assert(task == _last, "Sanity"); 517 _last = task->prev(); 518 } 519 --_size; 520 } 521 522 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 523 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 524 remove(task); 525 526 // Enqueue the task for reclamation (should be done outside MCQ lock) 527 task->set_next(_first_stale); 528 task->set_prev(NULL); 529 _first_stale = task; 530 } 531 532 // methods in the compile queue need to be marked as used on the stack 533 // so that they don't get reclaimed by Redefine Classes 534 void CompileQueue::mark_on_stack() { 535 CompileTask* task = _first; 536 while (task != NULL) { 537 task->mark_on_stack(); 538 task = task->next(); 539 } 540 } 541 542 543 CompileQueue* CompileBroker::compile_queue(int comp_level) { 544 if (is_c2_compile(comp_level)) return _c2_compile_queue; 545 if (is_c1_compile(comp_level)) return _c1_compile_queue; 546 return NULL; 547 } 548 549 void CompileBroker::print_compile_queues(outputStream* st) { 550 st->print_cr("Current compiles: "); 551 552 char buf[2000]; 553 int buflen = sizeof(buf); 554 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true); 555 556 st->cr(); 557 if (_c1_compile_queue != NULL) { 558 _c1_compile_queue->print(st); 559 } 560 if (_c2_compile_queue != NULL) { 561 _c2_compile_queue->print(st); 562 } 563 } 564 565 void CompileQueue::print(outputStream* st) { 566 assert_locked_or_safepoint(MethodCompileQueue_lock); 567 st->print_cr("%s:", name()); 568 CompileTask* task = _first; 569 if (task == NULL) { 570 st->print_cr("Empty"); 571 } else { 572 while (task != NULL) { 573 task->print(st, NULL, true, true); 574 task = task->next(); 575 } 576 } 577 st->cr(); 578 } 579 580 void CompileQueue::print_tty() { 581 ResourceMark rm; 582 stringStream ss; 583 // Dump the compile queue into a buffer before locking the tty 584 print(&ss); 585 { 586 ttyLocker ttyl; 587 tty->print("%s", ss.as_string()); 588 } 589 } 590 591 CompilerCounters::CompilerCounters() { 592 _current_method[0] = '\0'; 593 _compile_type = CompileBroker::no_compile; 594 } 595 596 #if INCLUDE_JFR && COMPILER2_OR_JVMCI 597 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping 598 // in compiler/compilerEvent.cpp) and registers it with its serializer. 599 // 600 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp, 601 // so if c2 is used, it should be always registered first. 602 // This function is called during vm initialization. 603 void register_jfr_phasetype_serializer(CompilerType compiler_type) { 604 ResourceMark rm; 605 static bool first_registration = true; 606 if (compiler_type == compiler_jvmci) { 607 // register serializer, phases will be added later lazily. 608 GrowableArray<const char*>* jvmci_phase_names = new GrowableArray<const char*>(1); 609 jvmci_phase_names->append("NOT_A_PHASE_NAME"); 610 CompilerEvent::PhaseEvent::register_phases(jvmci_phase_names); 611 first_registration = false; 612 #ifdef COMPILER2 613 } else if (compiler_type == compiler_c2) { 614 assert(first_registration, "invariant"); // c2 must be registered first. 615 GrowableArray<const char*>* c2_phase_names = new GrowableArray<const char*>(PHASE_NUM_TYPES); 616 for (int i = 0; i < PHASE_NUM_TYPES; i++) { 617 c2_phase_names->append(CompilerPhaseTypeHelper::to_string((CompilerPhaseType)i)); 618 } 619 CompilerEvent::PhaseEvent::register_phases(c2_phase_names); 620 first_registration = false; 621 #endif // COMPILER2 622 } 623 } 624 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI 625 626 // ------------------------------------------------------------------ 627 // CompileBroker::compilation_init 628 // 629 // Initialize the Compilation object 630 void CompileBroker::compilation_init_phase1(Thread* THREAD) { 631 // No need to initialize compilation system if we do not use it. 632 if (!UseCompiler) { 633 return; 634 } 635 // Set the interface to the current compiler(s). 636 _c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 637 _c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 638 639 #if INCLUDE_JVMCI 640 if (EnableJVMCI) { 641 // This is creating a JVMCICompiler singleton. 642 JVMCICompiler* jvmci = new JVMCICompiler(); 643 644 if (UseJVMCICompiler) { 645 _compilers[1] = jvmci; 646 if (FLAG_IS_DEFAULT(JVMCIThreads)) { 647 if (BootstrapJVMCI) { 648 // JVMCI will bootstrap so give it more threads 649 _c2_count = MIN2(32, os::active_processor_count()); 650 } 651 } else { 652 _c2_count = JVMCIThreads; 653 } 654 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) { 655 } else { 656 _c1_count = JVMCIHostThreads; 657 } 658 } 659 } 660 #endif // INCLUDE_JVMCI 661 662 #ifdef COMPILER1 663 if (_c1_count > 0) { 664 _compilers[0] = new Compiler(); 665 } 666 #endif // COMPILER1 667 668 #ifdef COMPILER2 669 if (true JVMCI_ONLY( && !UseJVMCICompiler)) { 670 if (_c2_count > 0) { 671 _compilers[1] = new C2Compiler(); 672 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit. 673 // idToPhase mapping for c2 is in opto/phasetype.hpp 674 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);) 675 } 676 } 677 #endif // COMPILER2 678 679 #if INCLUDE_JVMCI 680 // Register after c2 registration. 681 // JVMCI CompilerPhaseType idToPhase mapping is dynamic. 682 if (EnableJVMCI) { 683 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);) 684 } 685 #endif // INCLUDE_JVMCI 686 687 // Start the compiler thread(s) and the sweeper thread 688 init_compiler_sweeper_threads(); 689 // totalTime performance counter is always created as it is required 690 // by the implementation of java.lang.management.CompilationMXBean. 691 { 692 // Ensure OOM leads to vm_exit_during_initialization. 693 EXCEPTION_MARK; 694 _perf_total_compilation = 695 PerfDataManager::create_counter(JAVA_CI, "totalTime", 696 PerfData::U_Ticks, CHECK); 697 } 698 699 if (UsePerfData) { 700 701 EXCEPTION_MARK; 702 703 // create the jvmstat performance counters 704 _perf_osr_compilation = 705 PerfDataManager::create_counter(SUN_CI, "osrTime", 706 PerfData::U_Ticks, CHECK); 707 708 _perf_standard_compilation = 709 PerfDataManager::create_counter(SUN_CI, "standardTime", 710 PerfData::U_Ticks, CHECK); 711 712 _perf_total_bailout_count = 713 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 714 PerfData::U_Events, CHECK); 715 716 _perf_total_invalidated_count = 717 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 718 PerfData::U_Events, CHECK); 719 720 _perf_total_compile_count = 721 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 722 PerfData::U_Events, CHECK); 723 _perf_total_osr_compile_count = 724 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 725 PerfData::U_Events, CHECK); 726 727 _perf_total_standard_compile_count = 728 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 729 PerfData::U_Events, CHECK); 730 731 _perf_sum_osr_bytes_compiled = 732 PerfDataManager::create_counter(SUN_CI, "osrBytes", 733 PerfData::U_Bytes, CHECK); 734 735 _perf_sum_standard_bytes_compiled = 736 PerfDataManager::create_counter(SUN_CI, "standardBytes", 737 PerfData::U_Bytes, CHECK); 738 739 _perf_sum_nmethod_size = 740 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 741 PerfData::U_Bytes, CHECK); 742 743 _perf_sum_nmethod_code_size = 744 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 745 PerfData::U_Bytes, CHECK); 746 747 _perf_last_method = 748 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 749 CompilerCounters::cmname_buffer_length, 750 "", CHECK); 751 752 _perf_last_failed_method = 753 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 754 CompilerCounters::cmname_buffer_length, 755 "", CHECK); 756 757 _perf_last_invalidated_method = 758 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 759 CompilerCounters::cmname_buffer_length, 760 "", CHECK); 761 762 _perf_last_compile_type = 763 PerfDataManager::create_variable(SUN_CI, "lastType", 764 PerfData::U_None, 765 (jlong)CompileBroker::no_compile, 766 CHECK); 767 768 _perf_last_compile_size = 769 PerfDataManager::create_variable(SUN_CI, "lastSize", 770 PerfData::U_Bytes, 771 (jlong)CompileBroker::no_compile, 772 CHECK); 773 774 775 _perf_last_failed_type = 776 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 777 PerfData::U_None, 778 (jlong)CompileBroker::no_compile, 779 CHECK); 780 781 _perf_last_invalidated_type = 782 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 783 PerfData::U_None, 784 (jlong)CompileBroker::no_compile, 785 CHECK); 786 } 787 } 788 789 // Completes compiler initialization. Compilation requests submitted 790 // prior to this will be silently ignored. 791 void CompileBroker::compilation_init_phase2() { 792 _initialized = true; 793 } 794 795 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) { 796 Handle string = java_lang_String::create_from_str(name, CHECK_NH); 797 Handle thread_group(THREAD, Universe::system_thread_group()); 798 return JavaCalls::construct_new_instance( 799 SystemDictionary::Thread_klass(), 800 vmSymbols::threadgroup_string_void_signature(), 801 thread_group, 802 string, 803 CHECK_NH); 804 } 805 806 #if defined(ASSERT) && COMPILER2_OR_JVMCI 807 // See Deoptimization::deoptimize_objects_alot_loop() 808 class DeoptimizeObjectsALotThread : public JavaThread { 809 public: 810 DeoptimizeObjectsALotThread(); 811 bool is_hidden_from_external_view() const { return true; } 812 }; 813 814 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) { 815 Deoptimization::deoptimize_objects_alot_loop(); 816 } 817 818 DeoptimizeObjectsALotThread::DeoptimizeObjectsALotThread() 819 : JavaThread(&deopt_objs_alot_thread_entry) { 820 } 821 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI 822 823 824 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, Thread* THREAD) { 825 JavaThread* new_thread = NULL; 826 { 827 MutexLocker mu(THREAD, Threads_lock); 828 if (type == compiler_t) { 829 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) { 830 CompilerCounters* counters = new CompilerCounters(); 831 new_thread = new CompilerThread(queue, counters); 832 } 833 } else if (type == sweeper_t) { 834 new_thread = new CodeCacheSweeperThread(); 835 } 836 #if defined(ASSERT) && COMPILER2_OR_JVMCI 837 else { 838 new_thread = new DeoptimizeObjectsALotThread(); 839 } 840 #endif // ASSERT 841 // At this point the new CompilerThread data-races with this startup 842 // thread (which I believe is the primoridal thread and NOT the VM 843 // thread). This means Java bytecodes being executed at startup can 844 // queue compile jobs which will run at whatever default priority the 845 // newly created CompilerThread runs at. 846 847 848 // At this point it may be possible that no osthread was created for the 849 // JavaThread due to lack of memory. We would have to throw an exception 850 // in that case. However, since this must work and we do not allow 851 // exceptions anyway, check and abort if this fails. But first release the 852 // lock. 853 854 if (new_thread != NULL && new_thread->osthread() != NULL) { 855 856 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), new_thread); 857 858 // Note that this only sets the JavaThread _priority field, which by 859 // definition is limited to Java priorities and not OS priorities. 860 // The os-priority is set in the CompilerThread startup code itself 861 862 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority); 863 864 // Note that we cannot call os::set_priority because it expects Java 865 // priorities and we are *explicitly* using OS priorities so that it's 866 // possible to set the compiler thread priority higher than any Java 867 // thread. 868 869 int native_prio = CompilerThreadPriority; 870 if (native_prio == -1) { 871 if (UseCriticalCompilerThreadPriority) { 872 native_prio = os::java_to_os_priority[CriticalPriority]; 873 } else { 874 native_prio = os::java_to_os_priority[NearMaxPriority]; 875 } 876 } 877 os::set_native_priority(new_thread, native_prio); 878 879 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle)); 880 881 new_thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle)); 882 if (type == compiler_t) { 883 new_thread->as_CompilerThread()->set_compiler(comp); 884 } 885 Threads::add(new_thread); 886 Thread::start(new_thread); 887 } 888 } 889 890 // First release lock before aborting VM. 891 if (new_thread == NULL || new_thread->osthread() == NULL) { 892 if (UseDynamicNumberOfCompilerThreads && type == compiler_t && comp->num_compiler_threads() > 0) { 893 if (new_thread != NULL) { 894 new_thread->smr_delete(); 895 } 896 return NULL; 897 } 898 vm_exit_during_initialization("java.lang.OutOfMemoryError", 899 os::native_thread_creation_failed_msg()); 900 } 901 902 // Let go of Threads_lock before yielding 903 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 904 905 return new_thread; 906 } 907 908 909 void CompileBroker::init_compiler_sweeper_threads() { 910 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0)); 911 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes()); 912 913 // Ensure any exceptions lead to vm_exit_during_initialization. 914 EXCEPTION_MARK; 915 #if !defined(ZERO) 916 assert(_c2_count > 0 || _c1_count > 0, "No compilers?"); 917 #endif // !ZERO 918 // Initialize the compilation queue 919 if (_c2_count > 0) { 920 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue"; 921 _c2_compile_queue = new CompileQueue(name); 922 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler); 923 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler); 924 } 925 if (_c1_count > 0) { 926 _c1_compile_queue = new CompileQueue("C1 compile queue"); 927 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler); 928 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler); 929 } 930 931 char name_buffer[256]; 932 933 for (int i = 0; i < _c2_count; i++) { 934 jobject thread_handle = NULL; 935 // Create all j.l.Thread objects for C1 and C2 threads here, but only one 936 // for JVMCI compiler which can create further ones on demand. 937 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {) 938 // Create a name for our thread. 939 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i); 940 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 941 thread_handle = JNIHandles::make_global(thread_oop); 942 JVMCI_ONLY(}) 943 _compiler2_objects[i] = thread_handle; 944 _compiler2_logs[i] = NULL; 945 946 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 947 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD); 948 assert(ct != NULL, "should have been handled for initial thread"); 949 _compilers[1]->set_num_compiler_threads(i + 1); 950 if (TraceCompilerThreads) { 951 ResourceMark rm; 952 MutexLocker mu(Threads_lock); 953 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name()); 954 } 955 } 956 } 957 958 for (int i = 0; i < _c1_count; i++) { 959 // Create a name for our thread. 960 sprintf(name_buffer, "C1 CompilerThread%d", i); 961 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 962 jobject thread_handle = JNIHandles::make_global(thread_oop); 963 _compiler1_objects[i] = thread_handle; 964 _compiler1_logs[i] = NULL; 965 966 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 967 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD); 968 assert(ct != NULL, "should have been handled for initial thread"); 969 _compilers[0]->set_num_compiler_threads(i + 1); 970 if (TraceCompilerThreads) { 971 ResourceMark rm; 972 MutexLocker mu(Threads_lock); 973 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name()); 974 } 975 } 976 } 977 978 if (UsePerfData) { 979 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK); 980 } 981 982 if (MethodFlushing) { 983 // Initialize the sweeper thread 984 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK); 985 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop()); 986 make_thread(sweeper_t, thread_handle, NULL, NULL, THREAD); 987 } 988 989 #if defined(ASSERT) && COMPILER2_OR_JVMCI 990 if (DeoptimizeObjectsALot == 2) { 991 // Initialize and start the object deoptimizer threads 992 for (int thread_count = 0; thread_count < DeoptimizeObjectsALotThreadCount; thread_count++) { 993 Handle thread_oop = create_thread_oop("Deoptimize objects a lot thread", CHECK); 994 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop()); 995 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD); 996 } 997 } 998 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI 999 } 1000 1001 void CompileBroker::possibly_add_compiler_threads(Thread* THREAD) { 1002 1003 julong available_memory = os::available_memory(); 1004 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All). 1005 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled), 1006 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled); 1007 1008 // Only do attempt to start additional threads if the lock is free. 1009 if (!CompileThread_lock->try_lock()) return; 1010 1011 if (_c2_compile_queue != NULL) { 1012 int old_c2_count = _compilers[1]->num_compiler_threads(); 1013 int new_c2_count = MIN4(_c2_count, 1014 _c2_compile_queue->size() / 2, 1015 (int)(available_memory / (200*M)), 1016 (int)(available_cc_np / (128*K))); 1017 1018 for (int i = old_c2_count; i < new_c2_count; i++) { 1019 #if INCLUDE_JVMCI 1020 if (UseJVMCICompiler) { 1021 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread 1022 // objects as their existence is completely hidden from the rest of 1023 // the VM (and those compiler threads can't call Java code to do the 1024 // creation anyway). For JVMCI we have to create new j.l.Thread objects 1025 // as they are visible and we can see unexpected thread lifecycle 1026 // transitions if we bind them to new JavaThreads. 1027 if (!THREAD->can_call_java()) break; 1028 char name_buffer[256]; 1029 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i); 1030 Handle thread_oop; 1031 { 1032 // We have to give up the lock temporarily for the Java calls. 1033 MutexUnlocker mu(CompileThread_lock); 1034 thread_oop = create_thread_oop(name_buffer, THREAD); 1035 } 1036 if (HAS_PENDING_EXCEPTION) { 1037 if (TraceCompilerThreads) { 1038 ResourceMark rm; 1039 tty->print_cr("JVMCI compiler thread creation failed:"); 1040 PENDING_EXCEPTION->print(); 1041 } 1042 CLEAR_PENDING_EXCEPTION; 1043 break; 1044 } 1045 // Check if another thread has beaten us during the Java calls. 1046 if (_compilers[1]->num_compiler_threads() != i) break; 1047 jobject thread_handle = JNIHandles::make_global(thread_oop); 1048 assert(compiler2_object(i) == NULL, "Old one must be released!"); 1049 _compiler2_objects[i] = thread_handle; 1050 } 1051 #endif 1052 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD); 1053 if (ct == NULL) break; 1054 _compilers[1]->set_num_compiler_threads(i + 1); 1055 if (TraceCompilerThreads) { 1056 ResourceMark rm; 1057 MutexLocker mu(Threads_lock); 1058 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)", 1059 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M)); 1060 } 1061 } 1062 } 1063 1064 if (_c1_compile_queue != NULL) { 1065 int old_c1_count = _compilers[0]->num_compiler_threads(); 1066 int new_c1_count = MIN4(_c1_count, 1067 _c1_compile_queue->size() / 4, 1068 (int)(available_memory / (100*M)), 1069 (int)(available_cc_p / (128*K))); 1070 1071 for (int i = old_c1_count; i < new_c1_count; i++) { 1072 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD); 1073 if (ct == NULL) break; 1074 _compilers[0]->set_num_compiler_threads(i + 1); 1075 if (TraceCompilerThreads) { 1076 ResourceMark rm; 1077 MutexLocker mu(Threads_lock); 1078 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)", 1079 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M)); 1080 } 1081 } 1082 } 1083 1084 CompileThread_lock->unlock(); 1085 } 1086 1087 1088 /** 1089 * Set the methods on the stack as on_stack so that redefine classes doesn't 1090 * reclaim them. This method is executed at a safepoint. 1091 */ 1092 void CompileBroker::mark_on_stack() { 1093 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1094 // Since we are at a safepoint, we do not need a lock to access 1095 // the compile queues. 1096 if (_c2_compile_queue != NULL) { 1097 _c2_compile_queue->mark_on_stack(); 1098 } 1099 if (_c1_compile_queue != NULL) { 1100 _c1_compile_queue->mark_on_stack(); 1101 } 1102 } 1103 1104 // ------------------------------------------------------------------ 1105 // CompileBroker::compile_method 1106 // 1107 // Request compilation of a method. 1108 void CompileBroker::compile_method_base(const methodHandle& method, 1109 int osr_bci, 1110 int comp_level, 1111 const methodHandle& hot_method, 1112 int hot_count, 1113 CompileTask::CompileReason compile_reason, 1114 bool blocking, 1115 Thread* thread) { 1116 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1117 assert(method->method_holder()->is_instance_klass(), 1118 "sanity check"); 1119 assert(!method->method_holder()->is_not_initialized(), 1120 "method holder must be initialized"); 1121 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1122 1123 if (CIPrintRequests) { 1124 tty->print("request: "); 1125 method->print_short_name(tty); 1126 if (osr_bci != InvocationEntryBci) { 1127 tty->print(" osr_bci: %d", osr_bci); 1128 } 1129 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count); 1130 if (!hot_method.is_null()) { 1131 tty->print(" hot: "); 1132 if (hot_method() != method()) { 1133 hot_method->print_short_name(tty); 1134 } else { 1135 tty->print("yes"); 1136 } 1137 } 1138 tty->cr(); 1139 } 1140 1141 // A request has been made for compilation. Before we do any 1142 // real work, check to see if the method has been compiled 1143 // in the meantime with a definitive result. 1144 if (compilation_is_complete(method, osr_bci, comp_level)) { 1145 return; 1146 } 1147 1148 #ifndef PRODUCT 1149 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1150 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1151 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1152 return; 1153 } 1154 } 1155 #endif 1156 1157 // If this method is already in the compile queue, then 1158 // we do not block the current thread. 1159 if (compilation_is_in_queue(method)) { 1160 // We may want to decay our counter a bit here to prevent 1161 // multiple denied requests for compilation. This is an 1162 // open compilation policy issue. Note: The other possibility, 1163 // in the case that this is a blocking compile request, is to have 1164 // all subsequent blocking requesters wait for completion of 1165 // ongoing compiles. Note that in this case we'll need a protocol 1166 // for freeing the associated compile tasks. [Or we could have 1167 // a single static monitor on which all these waiters sleep.] 1168 return; 1169 } 1170 1171 if (TieredCompilation) { 1172 // Tiered policy requires MethodCounters to exist before adding a method to 1173 // the queue. Create if we don't have them yet. 1174 method->get_method_counters(thread); 1175 } 1176 1177 // Outputs from the following MutexLocker block: 1178 CompileTask* task = NULL; 1179 CompileQueue* queue = compile_queue(comp_level); 1180 1181 // Acquire our lock. 1182 { 1183 MutexLocker locker(thread, MethodCompileQueue_lock); 1184 1185 // Make sure the method has not slipped into the queues since 1186 // last we checked; note that those checks were "fast bail-outs". 1187 // Here we need to be more careful, see 14012000 below. 1188 if (compilation_is_in_queue(method)) { 1189 return; 1190 } 1191 1192 // We need to check again to see if the compilation has 1193 // completed. A previous compilation may have registered 1194 // some result. 1195 if (compilation_is_complete(method, osr_bci, comp_level)) { 1196 return; 1197 } 1198 1199 // We now know that this compilation is not pending, complete, 1200 // or prohibited. Assign a compile_id to this compilation 1201 // and check to see if it is in our [Start..Stop) range. 1202 int compile_id = assign_compile_id(method, osr_bci); 1203 if (compile_id == 0) { 1204 // The compilation falls outside the allowed range. 1205 return; 1206 } 1207 1208 #if INCLUDE_JVMCI 1209 if (UseJVMCICompiler && blocking) { 1210 // Don't allow blocking compiles for requests triggered by JVMCI. 1211 if (thread->is_Compiler_thread()) { 1212 blocking = false; 1213 } 1214 1215 if (!UseJVMCINativeLibrary) { 1216 // Don't allow blocking compiles if inside a class initializer or while performing class loading 1217 vframeStream vfst((JavaThread*) thread); 1218 for (; !vfst.at_end(); vfst.next()) { 1219 if (vfst.method()->is_static_initializer() || 1220 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) && 1221 vfst.method()->name() == vmSymbols::loadClass_name())) { 1222 blocking = false; 1223 break; 1224 } 1225 } 1226 } 1227 1228 // Don't allow blocking compilation requests to JVMCI 1229 // if JVMCI itself is not yet initialized 1230 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) { 1231 blocking = false; 1232 } 1233 1234 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown 1235 // to avoid deadlock between compiler thread(s) and threads run at shutdown 1236 // such as the DestroyJavaVM thread. 1237 if (JVMCI::in_shutdown()) { 1238 blocking = false; 1239 } 1240 } 1241 #endif // INCLUDE_JVMCI 1242 1243 // We will enter the compilation in the queue. 1244 // 14012000: Note that this sets the queued_for_compile bits in 1245 // the target method. We can now reason that a method cannot be 1246 // queued for compilation more than once, as follows: 1247 // Before a thread queues a task for compilation, it first acquires 1248 // the compile queue lock, then checks if the method's queued bits 1249 // are set or it has already been compiled. Thus there can not be two 1250 // instances of a compilation task for the same method on the 1251 // compilation queue. Consider now the case where the compilation 1252 // thread has already removed a task for that method from the queue 1253 // and is in the midst of compiling it. In this case, the 1254 // queued_for_compile bits must be set in the method (and these 1255 // will be visible to the current thread, since the bits were set 1256 // under protection of the compile queue lock, which we hold now. 1257 // When the compilation completes, the compiler thread first sets 1258 // the compilation result and then clears the queued_for_compile 1259 // bits. Neither of these actions are protected by a barrier (or done 1260 // under the protection of a lock), so the only guarantee we have 1261 // (on machines with TSO (Total Store Order)) is that these values 1262 // will update in that order. As a result, the only combinations of 1263 // these bits that the current thread will see are, in temporal order: 1264 // <RESULT, QUEUE> : 1265 // <0, 1> : in compile queue, but not yet compiled 1266 // <1, 1> : compiled but queue bit not cleared 1267 // <1, 0> : compiled and queue bit cleared 1268 // Because we first check the queue bits then check the result bits, 1269 // we are assured that we cannot introduce a duplicate task. 1270 // Note that if we did the tests in the reverse order (i.e. check 1271 // result then check queued bit), we could get the result bit before 1272 // the compilation completed, and the queue bit after the compilation 1273 // completed, and end up introducing a "duplicate" (redundant) task. 1274 // In that case, the compiler thread should first check if a method 1275 // has already been compiled before trying to compile it. 1276 // NOTE: in the event that there are multiple compiler threads and 1277 // there is de-optimization/recompilation, things will get hairy, 1278 // and in that case it's best to protect both the testing (here) of 1279 // these bits, and their updating (here and elsewhere) under a 1280 // common lock. 1281 task = create_compile_task(queue, 1282 compile_id, method, 1283 osr_bci, comp_level, 1284 hot_method, hot_count, compile_reason, 1285 blocking); 1286 } 1287 1288 if (blocking) { 1289 wait_for_completion(task); 1290 } 1291 } 1292 1293 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1294 int comp_level, 1295 const methodHandle& hot_method, int hot_count, 1296 CompileTask::CompileReason compile_reason, 1297 Thread* THREAD) { 1298 // Do nothing if compilebroker is not initalized or compiles are submitted on level none 1299 if (!_initialized || comp_level == CompLevel_none) { 1300 return NULL; 1301 } 1302 1303 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1304 assert(comp != NULL, "Ensure we have a compiler"); 1305 1306 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp); 1307 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD); 1308 DirectivesStack::release(directive); 1309 return nm; 1310 } 1311 1312 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1313 int comp_level, 1314 const methodHandle& hot_method, int hot_count, 1315 CompileTask::CompileReason compile_reason, 1316 DirectiveSet* directive, 1317 Thread* THREAD) { 1318 1319 // make sure arguments make sense 1320 assert(method->method_holder()->is_instance_klass(), "not an instance method"); 1321 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1322 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1323 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1324 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level"); 1325 // allow any levels for WhiteBox 1326 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1327 // return quickly if possible 1328 1329 // lock, make sure that the compilation 1330 // isn't prohibited in a straightforward way. 1331 AbstractCompiler* comp = CompileBroker::compiler(comp_level); 1332 if (comp == NULL || !comp->can_compile_method(method) || 1333 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) { 1334 return NULL; 1335 } 1336 1337 #if INCLUDE_JVMCI 1338 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) { 1339 return NULL; 1340 } 1341 #endif 1342 1343 if (osr_bci == InvocationEntryBci) { 1344 // standard compilation 1345 CompiledMethod* method_code = method->code(); 1346 if (method_code != NULL && method_code->is_nmethod()) { 1347 if (compilation_is_complete(method, osr_bci, comp_level)) { 1348 return (nmethod*) method_code; 1349 } 1350 } 1351 if (method->is_not_compilable(comp_level)) { 1352 return NULL; 1353 } 1354 } else { 1355 // osr compilation 1356 #ifndef TIERED 1357 // seems like an assert of dubious value 1358 assert(comp_level == CompLevel_highest_tier, 1359 "all OSR compiles are assumed to be at a single compilation level"); 1360 #endif // TIERED 1361 // We accept a higher level osr method 1362 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1363 if (nm != NULL) return nm; 1364 if (method->is_not_osr_compilable(comp_level)) return NULL; 1365 } 1366 1367 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1368 // some prerequisites that are compiler specific 1369 if (comp->is_c2()) { 1370 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1371 // Resolve all classes seen in the signature of the method 1372 // we are compiling. 1373 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1374 } 1375 1376 // If the method is native, do the lookup in the thread requesting 1377 // the compilation. Native lookups can load code, which is not 1378 // permitted during compilation. 1379 // 1380 // Note: A native method implies non-osr compilation which is 1381 // checked with an assertion at the entry of this method. 1382 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1383 bool in_base_library; 1384 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1385 if (HAS_PENDING_EXCEPTION) { 1386 // In case of an exception looking up the method, we just forget 1387 // about it. The interpreter will kick-in and throw the exception. 1388 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable() 1389 CLEAR_PENDING_EXCEPTION; 1390 return NULL; 1391 } 1392 assert(method->has_native_function(), "must have native code by now"); 1393 } 1394 1395 // RedefineClasses() has replaced this method; just return 1396 if (method->is_old()) { 1397 return NULL; 1398 } 1399 1400 // JVMTI -- post_compile_event requires jmethod_id() that may require 1401 // a lock the compiling thread can not acquire. Prefetch it here. 1402 if (JvmtiExport::should_post_compiled_method_load()) { 1403 method->jmethod_id(); 1404 } 1405 1406 // do the compilation 1407 if (method->is_native()) { 1408 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1409 #if defined(X86) && !defined(ZERO) 1410 // The following native methods: 1411 // 1412 // java.lang.Float.intBitsToFloat 1413 // java.lang.Float.floatToRawIntBits 1414 // java.lang.Double.longBitsToDouble 1415 // java.lang.Double.doubleToRawLongBits 1416 // 1417 // are called through the interpreter even if interpreter native stubs 1418 // are not preferred (i.e., calling through adapter handlers is preferred). 1419 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved 1420 // if the version of the methods from the native libraries is called. 1421 // As the interpreter and the C2-intrinsified version of the methods preserves 1422 // sNaNs, that would result in an inconsistent way of handling of sNaNs. 1423 if ((UseSSE >= 1 && 1424 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat || 1425 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) || 1426 (UseSSE >= 2 && 1427 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble || 1428 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) { 1429 return NULL; 1430 } 1431 #endif // X86 && !ZERO 1432 1433 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1434 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1435 // 1436 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1437 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1438 AdapterHandlerLibrary::create_native_wrapper(method); 1439 } else { 1440 return NULL; 1441 } 1442 } else { 1443 // If the compiler is shut off due to code cache getting full 1444 // fail out now so blocking compiles dont hang the java thread 1445 if (!should_compile_new_jobs()) { 1446 CompilationPolicy::policy()->delay_compilation(method()); 1447 return NULL; 1448 } 1449 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles; 1450 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD); 1451 } 1452 1453 // return requested nmethod 1454 // We accept a higher level osr method 1455 if (osr_bci == InvocationEntryBci) { 1456 CompiledMethod* code = method->code(); 1457 if (code == NULL) { 1458 return (nmethod*) code; 1459 } else { 1460 return code->as_nmethod_or_null(); 1461 } 1462 } 1463 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1464 } 1465 1466 1467 // ------------------------------------------------------------------ 1468 // CompileBroker::compilation_is_complete 1469 // 1470 // See if compilation of this method is already complete. 1471 bool CompileBroker::compilation_is_complete(const methodHandle& method, 1472 int osr_bci, 1473 int comp_level) { 1474 bool is_osr = (osr_bci != standard_entry_bci); 1475 if (is_osr) { 1476 if (method->is_not_osr_compilable(comp_level)) { 1477 return true; 1478 } else { 1479 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1480 return (result != NULL); 1481 } 1482 } else { 1483 if (method->is_not_compilable(comp_level)) { 1484 return true; 1485 } else { 1486 CompiledMethod* result = method->code(); 1487 if (result == NULL) return false; 1488 return comp_level == result->comp_level(); 1489 } 1490 } 1491 } 1492 1493 1494 /** 1495 * See if this compilation is already requested. 1496 * 1497 * Implementation note: there is only a single "is in queue" bit 1498 * for each method. This means that the check below is overly 1499 * conservative in the sense that an osr compilation in the queue 1500 * will block a normal compilation from entering the queue (and vice 1501 * versa). This can be remedied by a full queue search to disambiguate 1502 * cases. If it is deemed profitable, this may be done. 1503 */ 1504 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) { 1505 return method->queued_for_compilation(); 1506 } 1507 1508 // ------------------------------------------------------------------ 1509 // CompileBroker::compilation_is_prohibited 1510 // 1511 // See if this compilation is not allowed. 1512 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) { 1513 bool is_native = method->is_native(); 1514 // Some compilers may not support the compilation of natives. 1515 AbstractCompiler *comp = compiler(comp_level); 1516 if (is_native && 1517 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1518 method->set_not_compilable_quietly("native methods not supported", comp_level); 1519 return true; 1520 } 1521 1522 bool is_osr = (osr_bci != standard_entry_bci); 1523 // Some compilers may not support on stack replacement. 1524 if (is_osr && 1525 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1526 method->set_not_osr_compilable("OSR not supported", comp_level); 1527 return true; 1528 } 1529 1530 // The method may be explicitly excluded by the user. 1531 double scale; 1532 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) { 1533 bool quietly = CompilerOracle::should_exclude_quietly(); 1534 if (PrintCompilation && !quietly) { 1535 // This does not happen quietly... 1536 ResourceMark rm; 1537 tty->print("### Excluding %s:%s", 1538 method->is_native() ? "generation of native wrapper" : "compile", 1539 (method->is_static() ? " static" : "")); 1540 method->print_short_name(tty); 1541 tty->cr(); 1542 } 1543 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly); 1544 } 1545 1546 return false; 1547 } 1548 1549 /** 1550 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1551 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1552 * The function also allows to generate separate compilation IDs for OSR compilations. 1553 */ 1554 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) { 1555 #ifdef ASSERT 1556 bool is_osr = (osr_bci != standard_entry_bci); 1557 int id; 1558 if (method->is_native()) { 1559 assert(!is_osr, "can't be osr"); 1560 // Adapters, native wrappers and method handle intrinsics 1561 // should be generated always. 1562 return Atomic::add(&_compilation_id, 1); 1563 } else if (CICountOSR && is_osr) { 1564 id = Atomic::add(&_osr_compilation_id, 1); 1565 if (CIStartOSR <= id && id < CIStopOSR) { 1566 return id; 1567 } 1568 } else { 1569 id = Atomic::add(&_compilation_id, 1); 1570 if (CIStart <= id && id < CIStop) { 1571 return id; 1572 } 1573 } 1574 1575 // Method was not in the appropriate compilation range. 1576 method->set_not_compilable_quietly("Not in requested compile id range"); 1577 return 0; 1578 #else 1579 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1580 // only _compilation_id is incremented. 1581 return Atomic::add(&_compilation_id, 1); 1582 #endif 1583 } 1584 1585 // ------------------------------------------------------------------ 1586 // CompileBroker::assign_compile_id_unlocked 1587 // 1588 // Public wrapper for assign_compile_id that acquires the needed locks 1589 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) { 1590 MutexLocker locker(thread, MethodCompileQueue_lock); 1591 return assign_compile_id(method, osr_bci); 1592 } 1593 1594 // ------------------------------------------------------------------ 1595 // CompileBroker::create_compile_task 1596 // 1597 // Create a CompileTask object representing the current request for 1598 // compilation. Add this task to the queue. 1599 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1600 int compile_id, 1601 const methodHandle& method, 1602 int osr_bci, 1603 int comp_level, 1604 const methodHandle& hot_method, 1605 int hot_count, 1606 CompileTask::CompileReason compile_reason, 1607 bool blocking) { 1608 CompileTask* new_task = CompileTask::allocate(); 1609 new_task->initialize(compile_id, method, osr_bci, comp_level, 1610 hot_method, hot_count, compile_reason, 1611 blocking); 1612 queue->add(new_task); 1613 return new_task; 1614 } 1615 1616 #if INCLUDE_JVMCI 1617 // The number of milliseconds to wait before checking if 1618 // JVMCI compilation has made progress. 1619 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000; 1620 1621 // The number of JVMCI compilation progress checks that must fail 1622 // before unblocking a thread waiting for a blocking compilation. 1623 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10; 1624 1625 /** 1626 * Waits for a JVMCI compiler to complete a given task. This thread 1627 * waits until either the task completes or it sees no JVMCI compilation 1628 * progress for N consecutive milliseconds where N is 1629 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE * 1630 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS. 1631 * 1632 * @return true if this thread needs to free/recycle the task 1633 */ 1634 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) { 1635 MonitorLocker ml(thread, task->lock()); 1636 int progress_wait_attempts = 0; 1637 int methods_compiled = jvmci->methods_compiled(); 1638 while (!task->is_complete() && !is_compilation_disabled_forever() && 1639 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) { 1640 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread(); 1641 1642 bool progress; 1643 if (jvmci_compiler_thread != NULL) { 1644 // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress. 1645 progress = jvmci_compiler_thread->thread_state() != _thread_blocked && 1646 !jvmci_compiler_thread->is_external_suspend(); 1647 } else { 1648 // Still waiting on JVMCI compiler queue. This thread may be holding a lock 1649 // that all JVMCI compiler threads are blocked on. We use the counter for 1650 // successful JVMCI compilations to determine whether JVMCI compilation 1651 // is still making progress through the JVMCI compiler queue. 1652 progress = jvmci->methods_compiled() != methods_compiled; 1653 } 1654 1655 if (!progress) { 1656 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) { 1657 if (PrintCompilation) { 1658 task->print(tty, "wait for blocking compilation timed out"); 1659 } 1660 break; 1661 } 1662 } else { 1663 progress_wait_attempts = 0; 1664 if (jvmci_compiler_thread == NULL) { 1665 methods_compiled = jvmci->methods_compiled(); 1666 } 1667 } 1668 } 1669 task->clear_waiter(); 1670 return task->is_complete(); 1671 } 1672 #endif 1673 1674 /** 1675 * Wait for the compilation task to complete. 1676 */ 1677 void CompileBroker::wait_for_completion(CompileTask* task) { 1678 if (CIPrintCompileQueue) { 1679 ttyLocker ttyl; 1680 tty->print_cr("BLOCKING FOR COMPILE"); 1681 } 1682 1683 assert(task->is_blocking(), "can only wait on blocking task"); 1684 1685 JavaThread* thread = JavaThread::current(); 1686 1687 methodHandle method(thread, task->method()); 1688 bool free_task; 1689 #if INCLUDE_JVMCI 1690 AbstractCompiler* comp = compiler(task->comp_level()); 1691 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) { 1692 // It may return before compilation is completed. 1693 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread); 1694 } else 1695 #endif 1696 { 1697 MonitorLocker ml(thread, task->lock()); 1698 free_task = true; 1699 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1700 ml.wait(); 1701 } 1702 } 1703 1704 if (free_task) { 1705 if (is_compilation_disabled_forever()) { 1706 CompileTask::free(task); 1707 return; 1708 } 1709 1710 // It is harmless to check this status without the lock, because 1711 // completion is a stable property (until the task object is recycled). 1712 assert(task->is_complete(), "Compilation should have completed"); 1713 assert(task->code_handle() == NULL, "must be reset"); 1714 1715 // By convention, the waiter is responsible for recycling a 1716 // blocking CompileTask. Since there is only one waiter ever 1717 // waiting on a CompileTask, we know that no one else will 1718 // be using this CompileTask; we can free it. 1719 CompileTask::free(task); 1720 } 1721 } 1722 1723 /** 1724 * Initialize compiler thread(s) + compiler object(s). The postcondition 1725 * of this function is that the compiler runtimes are initialized and that 1726 * compiler threads can start compiling. 1727 */ 1728 bool CompileBroker::init_compiler_runtime() { 1729 CompilerThread* thread = CompilerThread::current(); 1730 AbstractCompiler* comp = thread->compiler(); 1731 // Final sanity check - the compiler object must exist 1732 guarantee(comp != NULL, "Compiler object must exist"); 1733 1734 { 1735 // Must switch to native to allocate ci_env 1736 ThreadToNativeFromVM ttn(thread); 1737 ciEnv ci_env((CompileTask*)NULL); 1738 // Cache Jvmti state 1739 ci_env.cache_jvmti_state(); 1740 // Cache DTrace flags 1741 ci_env.cache_dtrace_flags(); 1742 1743 // Switch back to VM state to do compiler initialization 1744 ThreadInVMfromNative tv(thread); 1745 ResetNoHandleMark rnhm; 1746 1747 // Perform per-thread and global initializations 1748 comp->initialize(); 1749 } 1750 1751 if (comp->is_failed()) { 1752 disable_compilation_forever(); 1753 // If compiler initialization failed, no compiler thread that is specific to a 1754 // particular compiler runtime will ever start to compile methods. 1755 shutdown_compiler_runtime(comp, thread); 1756 return false; 1757 } 1758 1759 // C1 specific check 1760 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1761 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1762 return false; 1763 } 1764 1765 return true; 1766 } 1767 1768 /** 1769 * If C1 and/or C2 initialization failed, we shut down all compilation. 1770 * We do this to keep things simple. This can be changed if it ever turns 1771 * out to be a problem. 1772 */ 1773 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1774 // Free buffer blob, if allocated 1775 if (thread->get_buffer_blob() != NULL) { 1776 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1777 CodeCache::free(thread->get_buffer_blob()); 1778 } 1779 1780 if (comp->should_perform_shutdown()) { 1781 // There are two reasons for shutting down the compiler 1782 // 1) compiler runtime initialization failed 1783 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1784 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1785 1786 // Only one thread per compiler runtime object enters here 1787 // Set state to shut down 1788 comp->set_shut_down(); 1789 1790 // Delete all queued compilation tasks to make compiler threads exit faster. 1791 if (_c1_compile_queue != NULL) { 1792 _c1_compile_queue->free_all(); 1793 } 1794 1795 if (_c2_compile_queue != NULL) { 1796 _c2_compile_queue->free_all(); 1797 } 1798 1799 // Set flags so that we continue execution with using interpreter only. 1800 UseCompiler = false; 1801 UseInterpreter = true; 1802 1803 // We could delete compiler runtimes also. However, there are references to 1804 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1805 // fail. This can be done later if necessary. 1806 } 1807 } 1808 1809 /** 1810 * Helper function to create new or reuse old CompileLog. 1811 */ 1812 CompileLog* CompileBroker::get_log(CompilerThread* ct) { 1813 if (!LogCompilation) return NULL; 1814 1815 AbstractCompiler *compiler = ct->compiler(); 1816 bool c1 = compiler->is_c1(); 1817 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects; 1818 assert(compiler_objects != NULL, "must be initialized at this point"); 1819 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs; 1820 assert(logs != NULL, "must be initialized at this point"); 1821 int count = c1 ? _c1_count : _c2_count; 1822 1823 // Find Compiler number by its threadObj. 1824 oop compiler_obj = ct->threadObj(); 1825 int compiler_number = 0; 1826 bool found = false; 1827 for (; compiler_number < count; compiler_number++) { 1828 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) { 1829 found = true; 1830 break; 1831 } 1832 } 1833 assert(found, "Compiler must exist at this point"); 1834 1835 // Determine pointer for this thread's log. 1836 CompileLog** log_ptr = &logs[compiler_number]; 1837 1838 // Return old one if it exists. 1839 CompileLog* log = *log_ptr; 1840 if (log != NULL) { 1841 ct->init_log(log); 1842 return log; 1843 } 1844 1845 // Create a new one and remember it. 1846 init_compiler_thread_log(); 1847 log = ct->log(); 1848 *log_ptr = log; 1849 return log; 1850 } 1851 1852 // ------------------------------------------------------------------ 1853 // CompileBroker::compiler_thread_loop 1854 // 1855 // The main loop run by a CompilerThread. 1856 void CompileBroker::compiler_thread_loop() { 1857 CompilerThread* thread = CompilerThread::current(); 1858 CompileQueue* queue = thread->queue(); 1859 // For the thread that initializes the ciObjectFactory 1860 // this resource mark holds all the shared objects 1861 ResourceMark rm; 1862 1863 // First thread to get here will initialize the compiler interface 1864 1865 { 1866 ASSERT_IN_VM; 1867 MutexLocker only_one (thread, CompileThread_lock); 1868 if (!ciObjectFactory::is_initialized()) { 1869 ciObjectFactory::initialize(); 1870 } 1871 } 1872 1873 // Open a log. 1874 CompileLog* log = get_log(thread); 1875 if (log != NULL) { 1876 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1877 thread->name(), 1878 os::current_thread_id(), 1879 os::current_process_id()); 1880 log->stamp(); 1881 log->end_elem(); 1882 } 1883 1884 // If compiler thread/runtime initialization fails, exit the compiler thread 1885 if (!init_compiler_runtime()) { 1886 return; 1887 } 1888 1889 thread->start_idle_timer(); 1890 1891 // Poll for new compilation tasks as long as the JVM runs. Compilation 1892 // should only be disabled if something went wrong while initializing the 1893 // compiler runtimes. This, in turn, should not happen. The only known case 1894 // when compiler runtime initialization fails is if there is not enough free 1895 // space in the code cache to generate the necessary stubs, etc. 1896 while (!is_compilation_disabled_forever()) { 1897 // We need this HandleMark to avoid leaking VM handles. 1898 HandleMark hm(thread); 1899 1900 CompileTask* task = queue->get(); 1901 if (task == NULL) { 1902 if (UseDynamicNumberOfCompilerThreads) { 1903 // Access compiler_count under lock to enforce consistency. 1904 MutexLocker only_one(CompileThread_lock); 1905 if (can_remove(thread, true)) { 1906 if (TraceCompilerThreads) { 1907 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time", 1908 thread->name(), thread->idle_time_millis()); 1909 } 1910 // Free buffer blob, if allocated 1911 if (thread->get_buffer_blob() != NULL) { 1912 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1913 CodeCache::free(thread->get_buffer_blob()); 1914 } 1915 return; // Stop this thread. 1916 } 1917 } 1918 } else { 1919 // Assign the task to the current thread. Mark this compilation 1920 // thread as active for the profiler. 1921 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition 1922 // occurs after fetching the compile task off the queue. 1923 CompileTaskWrapper ctw(task); 1924 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1925 task->set_code_handle(&result_handle); 1926 methodHandle method(thread, task->method()); 1927 1928 // Never compile a method if breakpoints are present in it 1929 if (method()->number_of_breakpoints() == 0) { 1930 // Compile the method. 1931 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1932 invoke_compiler_on_method(task); 1933 thread->start_idle_timer(); 1934 } else { 1935 // After compilation is disabled, remove remaining methods from queue 1936 method->clear_queued_for_compilation(); 1937 task->set_failure_reason("compilation is disabled"); 1938 } 1939 } 1940 1941 if (UseDynamicNumberOfCompilerThreads) { 1942 possibly_add_compiler_threads(thread); 1943 assert(!thread->has_pending_exception(), "should have been handled"); 1944 } 1945 } 1946 } 1947 1948 // Shut down compiler runtime 1949 shutdown_compiler_runtime(thread->compiler(), thread); 1950 } 1951 1952 // ------------------------------------------------------------------ 1953 // CompileBroker::init_compiler_thread_log 1954 // 1955 // Set up state required by +LogCompilation. 1956 void CompileBroker::init_compiler_thread_log() { 1957 CompilerThread* thread = CompilerThread::current(); 1958 char file_name[4*K]; 1959 FILE* fp = NULL; 1960 intx thread_id = os::current_thread_id(); 1961 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1962 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1963 if (dir == NULL) { 1964 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1965 thread_id, os::current_process_id()); 1966 } else { 1967 jio_snprintf(file_name, sizeof(file_name), 1968 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1969 os::file_separator(), thread_id, os::current_process_id()); 1970 } 1971 1972 fp = fopen(file_name, "wt"); 1973 if (fp != NULL) { 1974 if (LogCompilation && Verbose) { 1975 tty->print_cr("Opening compilation log %s", file_name); 1976 } 1977 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1978 if (log == NULL) { 1979 fclose(fp); 1980 return; 1981 } 1982 thread->init_log(log); 1983 1984 if (xtty != NULL) { 1985 ttyLocker ttyl; 1986 // Record any per thread log files 1987 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1988 } 1989 return; 1990 } 1991 } 1992 warning("Cannot open log file: %s", file_name); 1993 } 1994 1995 void CompileBroker::log_metaspace_failure() { 1996 const char* message = "some methods may not be compiled because metaspace " 1997 "is out of memory"; 1998 if (_compilation_log != NULL) { 1999 _compilation_log->log_metaspace_failure(message); 2000 } 2001 if (PrintCompilation) { 2002 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message); 2003 } 2004 } 2005 2006 2007 // ------------------------------------------------------------------ 2008 // CompileBroker::set_should_block 2009 // 2010 // Set _should_block. 2011 // Call this from the VM, with Threads_lock held and a safepoint requested. 2012 void CompileBroker::set_should_block() { 2013 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 2014 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 2015 #ifndef PRODUCT 2016 if (PrintCompilation && (Verbose || WizardMode)) 2017 tty->print_cr("notifying compiler thread pool to block"); 2018 #endif 2019 _should_block = true; 2020 } 2021 2022 // ------------------------------------------------------------------ 2023 // CompileBroker::maybe_block 2024 // 2025 // Call this from the compiler at convenient points, to poll for _should_block. 2026 void CompileBroker::maybe_block() { 2027 if (_should_block) { 2028 #ifndef PRODUCT 2029 if (PrintCompilation && (Verbose || WizardMode)) 2030 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 2031 #endif 2032 ThreadInVMfromNative tivfn(JavaThread::current()); 2033 } 2034 } 2035 2036 // wrapper for CodeCache::print_summary() 2037 static void codecache_print(bool detailed) 2038 { 2039 ResourceMark rm; 2040 stringStream s; 2041 // Dump code cache into a buffer before locking the tty, 2042 { 2043 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2044 CodeCache::print_summary(&s, detailed); 2045 } 2046 ttyLocker ttyl; 2047 tty->print("%s", s.as_string()); 2048 } 2049 2050 // wrapper for CodeCache::print_summary() using outputStream 2051 static void codecache_print(outputStream* out, bool detailed) { 2052 ResourceMark rm; 2053 stringStream s; 2054 2055 // Dump code cache into a buffer 2056 { 2057 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2058 CodeCache::print_summary(&s, detailed); 2059 } 2060 2061 char* remaining_log = s.as_string(); 2062 while (*remaining_log != '\0') { 2063 char* eol = strchr(remaining_log, '\n'); 2064 if (eol == NULL) { 2065 out->print_cr("%s", remaining_log); 2066 remaining_log = remaining_log + strlen(remaining_log); 2067 } else { 2068 *eol = '\0'; 2069 out->print_cr("%s", remaining_log); 2070 remaining_log = eol + 1; 2071 } 2072 } 2073 } 2074 2075 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env, 2076 int compilable, const char* failure_reason) { 2077 if (success) { 2078 task->mark_success(); 2079 if (ci_env != NULL) { 2080 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes()); 2081 } 2082 if (_compilation_log != NULL) { 2083 nmethod* code = task->code(); 2084 if (code != NULL) { 2085 _compilation_log->log_nmethod(thread, code); 2086 } 2087 } 2088 } else if (AbortVMOnCompilationFailure) { 2089 if (compilable == ciEnv::MethodCompilable_not_at_tier) { 2090 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason); 2091 } 2092 if (compilable == ciEnv::MethodCompilable_never) { 2093 fatal("Never compilable: %s", failure_reason); 2094 } 2095 } 2096 // simulate crash during compilation 2097 assert(task->compile_id() != CICrashAt, "just as planned"); 2098 } 2099 2100 static void post_compilation_event(EventCompilation& event, CompileTask* task) { 2101 assert(task != NULL, "invariant"); 2102 CompilerEvent::CompilationEvent::post(event, 2103 task->compile_id(), 2104 task->compiler()->type(), 2105 task->method(), 2106 task->comp_level(), 2107 task->is_success(), 2108 task->osr_bci() != CompileBroker::standard_entry_bci, 2109 (task->code() == NULL) ? 0 : task->code()->total_size(), 2110 task->num_inlined_bytecodes()); 2111 } 2112 2113 int DirectivesStack::_depth = 0; 2114 CompilerDirectives* DirectivesStack::_top = NULL; 2115 CompilerDirectives* DirectivesStack::_bottom = NULL; 2116 2117 // ------------------------------------------------------------------ 2118 // CompileBroker::invoke_compiler_on_method 2119 // 2120 // Compile a method. 2121 // 2122 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 2123 task->print_ul(); 2124 if (PrintCompilation) { 2125 ResourceMark rm; 2126 task->print_tty(); 2127 } 2128 elapsedTimer time; 2129 2130 CompilerThread* thread = CompilerThread::current(); 2131 ResourceMark rm(thread); 2132 2133 if (LogEvents) { 2134 _compilation_log->log_compile(thread, task); 2135 } 2136 2137 // Common flags. 2138 uint compile_id = task->compile_id(); 2139 int osr_bci = task->osr_bci(); 2140 bool is_osr = (osr_bci != standard_entry_bci); 2141 bool should_log = (thread->log() != NULL); 2142 bool should_break = false; 2143 const int task_level = task->comp_level(); 2144 AbstractCompiler* comp = task->compiler(); 2145 2146 DirectiveSet* directive; 2147 { 2148 // create the handle inside it's own block so it can't 2149 // accidentally be referenced once the thread transitions to 2150 // native. The NoHandleMark before the transition should catch 2151 // any cases where this occurs in the future. 2152 methodHandle method(thread, task->method()); 2153 assert(!method->is_native(), "no longer compile natives"); 2154 2155 // Look up matching directives 2156 directive = DirectivesStack::getMatchingDirective(method, comp); 2157 2158 // Update compile information when using perfdata. 2159 if (UsePerfData) { 2160 update_compile_perf_data(thread, method, is_osr); 2161 } 2162 2163 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 2164 } 2165 2166 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags(); 2167 if (should_log && !directive->LogOption) { 2168 should_log = false; 2169 } 2170 2171 // Allocate a new set of JNI handles. 2172 push_jni_handle_block(); 2173 Method* target_handle = task->method(); 2174 int compilable = ciEnv::MethodCompilable; 2175 const char* failure_reason = NULL; 2176 bool failure_reason_on_C_heap = false; 2177 const char* retry_message = NULL; 2178 2179 #if INCLUDE_JVMCI 2180 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) { 2181 JVMCICompiler* jvmci = (JVMCICompiler*) comp; 2182 2183 TraceTime t1("compilation", &time); 2184 EventCompilation event; 2185 JVMCICompileState compile_state(task); 2186 JVMCIRuntime *runtime = NULL; 2187 2188 if (JVMCI::in_shutdown()) { 2189 failure_reason = "in JVMCI shutdown"; 2190 retry_message = "not retryable"; 2191 compilable = ciEnv::MethodCompilable_never; 2192 } else if (compile_state.target_method_is_old()) { 2193 // Skip redefined methods 2194 failure_reason = "redefined method"; 2195 retry_message = "not retryable"; 2196 compilable = ciEnv::MethodCompilable_never; 2197 } else { 2198 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__); 2199 methodHandle method(thread, target_handle); 2200 runtime = env.runtime(); 2201 runtime->compile_method(&env, jvmci, method, osr_bci); 2202 2203 failure_reason = compile_state.failure_reason(); 2204 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap(); 2205 if (!compile_state.retryable()) { 2206 retry_message = "not retryable"; 2207 compilable = ciEnv::MethodCompilable_not_at_tier; 2208 } 2209 if (task->code() == NULL) { 2210 assert(failure_reason != NULL, "must specify failure_reason"); 2211 } 2212 } 2213 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason); 2214 if (event.should_commit()) { 2215 post_compilation_event(event, task); 2216 } 2217 2218 } else 2219 #endif // INCLUDE_JVMCI 2220 { 2221 NoHandleMark nhm; 2222 ThreadToNativeFromVM ttn(thread); 2223 2224 ciEnv ci_env(task); 2225 if (should_break) { 2226 ci_env.set_break_at_compile(true); 2227 } 2228 if (should_log) { 2229 ci_env.set_log(thread->log()); 2230 } 2231 assert(thread->env() == &ci_env, "set by ci_env"); 2232 // The thread-env() field is cleared in ~CompileTaskWrapper. 2233 2234 // Cache Jvmti state 2235 bool method_is_old = ci_env.cache_jvmti_state(); 2236 2237 // Skip redefined methods 2238 if (method_is_old) { 2239 ci_env.record_method_not_compilable("redefined method", true); 2240 } 2241 2242 // Cache DTrace flags 2243 ci_env.cache_dtrace_flags(); 2244 2245 ciMethod* target = ci_env.get_method_from_handle(target_handle); 2246 2247 TraceTime t1("compilation", &time); 2248 EventCompilation event; 2249 2250 if (comp == NULL) { 2251 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 2252 } else if (!ci_env.failing()) { 2253 if (WhiteBoxAPI && WhiteBox::compilation_locked) { 2254 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag); 2255 while (WhiteBox::compilation_locked) { 2256 locker.wait(); 2257 } 2258 } 2259 comp->compile_method(&ci_env, target, osr_bci, true, directive); 2260 2261 /* Repeat compilation without installing code for profiling purposes */ 2262 int repeat_compilation_count = directive->RepeatCompilationOption; 2263 while (repeat_compilation_count > 0) { 2264 task->print_ul("NO CODE INSTALLED"); 2265 comp->compile_method(&ci_env, target, osr_bci, false , directive); 2266 repeat_compilation_count--; 2267 } 2268 } 2269 2270 if (!ci_env.failing() && task->code() == NULL) { 2271 //assert(false, "compiler should always document failure"); 2272 // The compiler elected, without comment, not to register a result. 2273 // Do not attempt further compilations of this method. 2274 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 2275 } 2276 2277 // Copy this bit to the enclosing block: 2278 compilable = ci_env.compilable(); 2279 2280 if (ci_env.failing()) { 2281 failure_reason = ci_env.failure_reason(); 2282 retry_message = ci_env.retry_message(); 2283 ci_env.report_failure(failure_reason); 2284 } 2285 2286 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason); 2287 if (event.should_commit()) { 2288 post_compilation_event(event, task); 2289 } 2290 } 2291 // Remove the JNI handle block after the ciEnv destructor has run in 2292 // the previous block. 2293 pop_jni_handle_block(); 2294 2295 if (failure_reason != NULL) { 2296 task->set_failure_reason(failure_reason, failure_reason_on_C_heap); 2297 if (_compilation_log != NULL) { 2298 _compilation_log->log_failure(thread, task, failure_reason, retry_message); 2299 } 2300 if (PrintCompilation) { 2301 FormatBufferResource msg = retry_message != NULL ? 2302 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) : 2303 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason); 2304 task->print(tty, msg); 2305 } 2306 } 2307 2308 methodHandle method(thread, task->method()); 2309 2310 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2311 2312 collect_statistics(thread, time, task); 2313 2314 nmethod* nm = task->code(); 2315 if (nm != NULL) { 2316 nm->maybe_print_nmethod(directive); 2317 } 2318 DirectivesStack::release(directive); 2319 2320 if (PrintCompilation && PrintCompilation2) { 2321 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2322 tty->print("%4d ", compile_id); // print compilation number 2323 tty->print("%s ", (is_osr ? "%" : " ")); 2324 if (task->code() != NULL) { 2325 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2326 } 2327 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2328 } 2329 2330 Log(compilation, codecache) log; 2331 if (log.is_debug()) { 2332 LogStream ls(log.debug()); 2333 codecache_print(&ls, /* detailed= */ false); 2334 } 2335 if (PrintCodeCacheOnCompilation) { 2336 codecache_print(/* detailed= */ false); 2337 } 2338 // Disable compilation, if required. 2339 switch (compilable) { 2340 case ciEnv::MethodCompilable_never: 2341 if (is_osr) 2342 method->set_not_osr_compilable_quietly("MethodCompilable_never"); 2343 else 2344 method->set_not_compilable_quietly("MethodCompilable_never"); 2345 break; 2346 case ciEnv::MethodCompilable_not_at_tier: 2347 if (is_osr) 2348 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2349 else 2350 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2351 break; 2352 } 2353 2354 // Note that the queued_for_compilation bits are cleared without 2355 // protection of a mutex. [They were set by the requester thread, 2356 // when adding the task to the compile queue -- at which time the 2357 // compile queue lock was held. Subsequently, we acquired the compile 2358 // queue lock to get this task off the compile queue; thus (to belabour 2359 // the point somewhat) our clearing of the bits must be occurring 2360 // only after the setting of the bits. See also 14012000 above. 2361 method->clear_queued_for_compilation(); 2362 } 2363 2364 /** 2365 * The CodeCache is full. Print warning and disable compilation. 2366 * Schedule code cache cleaning so compilation can continue later. 2367 * This function needs to be called only from CodeCache::allocate(), 2368 * since we currently handle a full code cache uniformly. 2369 */ 2370 void CompileBroker::handle_full_code_cache(int code_blob_type) { 2371 UseInterpreter = true; 2372 if (UseCompiler || AlwaysCompileLoopMethods ) { 2373 if (xtty != NULL) { 2374 ResourceMark rm; 2375 stringStream s; 2376 // Dump code cache state into a buffer before locking the tty, 2377 // because log_state() will use locks causing lock conflicts. 2378 CodeCache::log_state(&s); 2379 // Lock to prevent tearing 2380 ttyLocker ttyl; 2381 xtty->begin_elem("code_cache_full"); 2382 xtty->print("%s", s.as_string()); 2383 xtty->stamp(); 2384 xtty->end_elem(); 2385 } 2386 2387 #ifndef PRODUCT 2388 if (ExitOnFullCodeCache) { 2389 codecache_print(/* detailed= */ true); 2390 before_exit(JavaThread::current()); 2391 exit_globals(); // will delete tty 2392 vm_direct_exit(1); 2393 } 2394 #endif 2395 if (UseCodeCacheFlushing) { 2396 // Since code cache is full, immediately stop new compiles 2397 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2398 NMethodSweeper::log_sweep("disable_compiler"); 2399 } 2400 } else { 2401 disable_compilation_forever(); 2402 } 2403 2404 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning()); 2405 } 2406 } 2407 2408 // ------------------------------------------------------------------ 2409 // CompileBroker::update_compile_perf_data 2410 // 2411 // Record this compilation for debugging purposes. 2412 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) { 2413 ResourceMark rm; 2414 char* method_name = method->name()->as_C_string(); 2415 char current_method[CompilerCounters::cmname_buffer_length]; 2416 size_t maxLen = CompilerCounters::cmname_buffer_length; 2417 2418 const char* class_name = method->method_holder()->name()->as_C_string(); 2419 2420 size_t s1len = strlen(class_name); 2421 size_t s2len = strlen(method_name); 2422 2423 // check if we need to truncate the string 2424 if (s1len + s2len + 2 > maxLen) { 2425 2426 // the strategy is to lop off the leading characters of the 2427 // class name and the trailing characters of the method name. 2428 2429 if (s2len + 2 > maxLen) { 2430 // lop of the entire class name string, let snprintf handle 2431 // truncation of the method name. 2432 class_name += s1len; // null string 2433 } 2434 else { 2435 // lop off the extra characters from the front of the class name 2436 class_name += ((s1len + s2len + 2) - maxLen); 2437 } 2438 } 2439 2440 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2441 2442 int last_compile_type = normal_compile; 2443 if (CICountOSR && is_osr) { 2444 last_compile_type = osr_compile; 2445 } 2446 2447 CompilerCounters* counters = thread->counters(); 2448 counters->set_current_method(current_method); 2449 counters->set_compile_type((jlong) last_compile_type); 2450 } 2451 2452 // ------------------------------------------------------------------ 2453 // CompileBroker::push_jni_handle_block 2454 // 2455 // Push on a new block of JNI handles. 2456 void CompileBroker::push_jni_handle_block() { 2457 JavaThread* thread = JavaThread::current(); 2458 2459 // Allocate a new block for JNI handles. 2460 // Inlined code from jni_PushLocalFrame() 2461 JNIHandleBlock* java_handles = thread->active_handles(); 2462 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2463 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2464 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2465 thread->set_active_handles(compile_handles); 2466 } 2467 2468 2469 // ------------------------------------------------------------------ 2470 // CompileBroker::pop_jni_handle_block 2471 // 2472 // Pop off the current block of JNI handles. 2473 void CompileBroker::pop_jni_handle_block() { 2474 JavaThread* thread = JavaThread::current(); 2475 2476 // Release our JNI handle block 2477 JNIHandleBlock* compile_handles = thread->active_handles(); 2478 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2479 thread->set_active_handles(java_handles); 2480 compile_handles->set_pop_frame_link(NULL); 2481 JNIHandleBlock::release_block(compile_handles, thread); // may block 2482 } 2483 2484 // ------------------------------------------------------------------ 2485 // CompileBroker::collect_statistics 2486 // 2487 // Collect statistics about the compilation. 2488 2489 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2490 bool success = task->is_success(); 2491 methodHandle method (thread, task->method()); 2492 uint compile_id = task->compile_id(); 2493 bool is_osr = (task->osr_bci() != standard_entry_bci); 2494 nmethod* code = task->code(); 2495 CompilerCounters* counters = thread->counters(); 2496 2497 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2498 MutexLocker locker(CompileStatistics_lock); 2499 2500 // _perf variables are production performance counters which are 2501 // updated regardless of the setting of the CITime and CITimeEach flags 2502 // 2503 2504 // account all time, including bailouts and failures in this counter; 2505 // C1 and C2 counters are counting both successful and unsuccessful compiles 2506 _t_total_compilation.add(time); 2507 2508 if (!success) { 2509 _total_bailout_count++; 2510 if (UsePerfData) { 2511 _perf_last_failed_method->set_value(counters->current_method()); 2512 _perf_last_failed_type->set_value(counters->compile_type()); 2513 _perf_total_bailout_count->inc(); 2514 } 2515 _t_bailedout_compilation.add(time); 2516 } else if (code == NULL) { 2517 if (UsePerfData) { 2518 _perf_last_invalidated_method->set_value(counters->current_method()); 2519 _perf_last_invalidated_type->set_value(counters->compile_type()); 2520 _perf_total_invalidated_count->inc(); 2521 } 2522 _total_invalidated_count++; 2523 _t_invalidated_compilation.add(time); 2524 } else { 2525 // Compilation succeeded 2526 2527 // update compilation ticks - used by the implementation of 2528 // java.lang.management.CompilationMXBean 2529 _perf_total_compilation->inc(time.ticks()); 2530 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2531 2532 if (CITime) { 2533 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes(); 2534 if (is_osr) { 2535 _t_osr_compilation.add(time); 2536 _sum_osr_bytes_compiled += bytes_compiled; 2537 } else { 2538 _t_standard_compilation.add(time); 2539 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2540 } 2541 2542 #if INCLUDE_JVMCI 2543 AbstractCompiler* comp = compiler(task->comp_level()); 2544 if (comp) { 2545 CompilerStatistics* stats = comp->stats(); 2546 if (stats) { 2547 if (is_osr) { 2548 stats->_osr.update(time, bytes_compiled); 2549 } else { 2550 stats->_standard.update(time, bytes_compiled); 2551 } 2552 stats->_nmethods_size += code->total_size(); 2553 stats->_nmethods_code_size += code->insts_size(); 2554 } else { // if (!stats) 2555 assert(false, "Compiler statistics object must exist"); 2556 } 2557 } else { // if (!comp) 2558 assert(false, "Compiler object must exist"); 2559 } 2560 #endif // INCLUDE_JVMCI 2561 } 2562 2563 if (UsePerfData) { 2564 // save the name of the last method compiled 2565 _perf_last_method->set_value(counters->current_method()); 2566 _perf_last_compile_type->set_value(counters->compile_type()); 2567 _perf_last_compile_size->set_value(method->code_size() + 2568 task->num_inlined_bytecodes()); 2569 if (is_osr) { 2570 _perf_osr_compilation->inc(time.ticks()); 2571 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2572 } else { 2573 _perf_standard_compilation->inc(time.ticks()); 2574 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2575 } 2576 } 2577 2578 if (CITimeEach) { 2579 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2580 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2581 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2582 } 2583 2584 // Collect counts of successful compilations 2585 _sum_nmethod_size += code->total_size(); 2586 _sum_nmethod_code_size += code->insts_size(); 2587 _total_compile_count++; 2588 2589 if (UsePerfData) { 2590 _perf_sum_nmethod_size->inc( code->total_size()); 2591 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2592 _perf_total_compile_count->inc(); 2593 } 2594 2595 if (is_osr) { 2596 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2597 _total_osr_compile_count++; 2598 } else { 2599 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2600 _total_standard_compile_count++; 2601 } 2602 } 2603 // set the current method for the thread to null 2604 if (UsePerfData) counters->set_current_method(""); 2605 } 2606 2607 const char* CompileBroker::compiler_name(int comp_level) { 2608 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2609 if (comp == NULL) { 2610 return "no compiler"; 2611 } else { 2612 return (comp->name()); 2613 } 2614 } 2615 2616 #if INCLUDE_JVMCI 2617 void CompileBroker::print_times(AbstractCompiler* comp) { 2618 CompilerStatistics* stats = comp->stats(); 2619 if (stats) { 2620 tty->print_cr(" %s {speed: %d bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}", 2621 comp->name(), stats->bytes_per_second(), 2622 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count, 2623 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count, 2624 stats->_nmethods_size, stats->_nmethods_code_size); 2625 } else { // if (!stats) 2626 assert(false, "Compiler statistics object must exist"); 2627 } 2628 comp->print_timers(); 2629 } 2630 #endif // INCLUDE_JVMCI 2631 2632 void CompileBroker::print_times(bool per_compiler, bool aggregate) { 2633 #if INCLUDE_JVMCI 2634 elapsedTimer standard_compilation; 2635 elapsedTimer total_compilation; 2636 elapsedTimer osr_compilation; 2637 2638 int standard_bytes_compiled = 0; 2639 int osr_bytes_compiled = 0; 2640 2641 int standard_compile_count = 0; 2642 int osr_compile_count = 0; 2643 int total_compile_count = 0; 2644 2645 int nmethods_size = 0; 2646 int nmethods_code_size = 0; 2647 bool printedHeader = false; 2648 2649 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) { 2650 AbstractCompiler* comp = _compilers[i]; 2651 if (comp != NULL) { 2652 if (per_compiler && aggregate && !printedHeader) { 2653 printedHeader = true; 2654 tty->cr(); 2655 tty->print_cr("Individual compiler times (for compiled methods only)"); 2656 tty->print_cr("------------------------------------------------"); 2657 tty->cr(); 2658 } 2659 CompilerStatistics* stats = comp->stats(); 2660 2661 if (stats) { 2662 standard_compilation.add(stats->_standard._time); 2663 osr_compilation.add(stats->_osr._time); 2664 2665 standard_bytes_compiled += stats->_standard._bytes; 2666 osr_bytes_compiled += stats->_osr._bytes; 2667 2668 standard_compile_count += stats->_standard._count; 2669 osr_compile_count += stats->_osr._count; 2670 2671 nmethods_size += stats->_nmethods_size; 2672 nmethods_code_size += stats->_nmethods_code_size; 2673 } else { // if (!stats) 2674 assert(false, "Compiler statistics object must exist"); 2675 } 2676 2677 if (per_compiler) { 2678 print_times(comp); 2679 } 2680 } 2681 } 2682 total_compile_count = osr_compile_count + standard_compile_count; 2683 total_compilation.add(osr_compilation); 2684 total_compilation.add(standard_compilation); 2685 2686 // In hosted mode, print the JVMCI compiler specific counters manually. 2687 if (!UseJVMCICompiler) { 2688 JVMCICompiler::print_compilation_timers(); 2689 } 2690 #else // INCLUDE_JVMCI 2691 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation; 2692 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation; 2693 elapsedTimer total_compilation = CompileBroker::_t_total_compilation; 2694 2695 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled; 2696 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled; 2697 2698 int standard_compile_count = CompileBroker::_total_standard_compile_count; 2699 int osr_compile_count = CompileBroker::_total_osr_compile_count; 2700 int total_compile_count = CompileBroker::_total_compile_count; 2701 2702 int nmethods_size = CompileBroker::_sum_nmethod_code_size; 2703 int nmethods_code_size = CompileBroker::_sum_nmethod_size; 2704 #endif // INCLUDE_JVMCI 2705 2706 if (!aggregate) { 2707 return; 2708 } 2709 tty->cr(); 2710 tty->print_cr("Accumulated compiler times"); 2711 tty->print_cr("----------------------------------------------------------"); 2712 //0000000000111111111122222222223333333333444444444455555555556666666666 2713 //0123456789012345678901234567890123456789012345678901234567890123456789 2714 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds()); 2715 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s", 2716 standard_compilation.seconds(), 2717 standard_compilation.seconds() / standard_compile_count); 2718 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s", 2719 CompileBroker::_t_bailedout_compilation.seconds(), 2720 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count); 2721 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s", 2722 osr_compilation.seconds(), 2723 osr_compilation.seconds() / osr_compile_count); 2724 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s", 2725 CompileBroker::_t_invalidated_compilation.seconds(), 2726 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count); 2727 2728 AbstractCompiler *comp = compiler(CompLevel_simple); 2729 if (comp != NULL) { 2730 tty->cr(); 2731 comp->print_timers(); 2732 } 2733 comp = compiler(CompLevel_full_optimization); 2734 if (comp != NULL) { 2735 tty->cr(); 2736 comp->print_timers(); 2737 } 2738 tty->cr(); 2739 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count); 2740 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count); 2741 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count); 2742 int tcb = osr_bytes_compiled + standard_bytes_compiled; 2743 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb); 2744 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled); 2745 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled); 2746 double tcs = total_compilation.seconds(); 2747 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs); 2748 tty->print_cr(" Average compilation speed : %8d bytes/s", bps); 2749 tty->cr(); 2750 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size); 2751 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size); 2752 } 2753 2754 // Print general/accumulated JIT information. 2755 void CompileBroker::print_info(outputStream *out) { 2756 if (out == NULL) out = tty; 2757 out->cr(); 2758 out->print_cr("======================"); 2759 out->print_cr(" General JIT info "); 2760 out->print_cr("======================"); 2761 out->cr(); 2762 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off"); 2763 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount); 2764 out->cr(); 2765 out->print_cr("CodeCache overview"); 2766 out->print_cr("--------------------------------------------------------"); 2767 out->cr(); 2768 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K); 2769 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K); 2770 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K); 2771 out->cr(); 2772 2773 out->cr(); 2774 out->print_cr("CodeCache cleaning overview"); 2775 out->print_cr("--------------------------------------------------------"); 2776 out->cr(); 2777 NMethodSweeper::print(out); 2778 out->print_cr("--------------------------------------------------------"); 2779 out->cr(); 2780 } 2781 2782 // Note: tty_lock must not be held upon entry to this function. 2783 // Print functions called from herein do "micro-locking" on tty_lock. 2784 // That's a tradeoff which keeps together important blocks of output. 2785 // At the same time, continuous tty_lock hold time is kept in check, 2786 // preventing concurrently printing threads from stalling a long time. 2787 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) { 2788 TimeStamp ts_total; 2789 TimeStamp ts_global; 2790 TimeStamp ts; 2791 2792 bool allFun = !strcmp(function, "all"); 2793 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun; 2794 bool usedSpace = !strcmp(function, "UsedSpace") || allFun; 2795 bool freeSpace = !strcmp(function, "FreeSpace") || allFun; 2796 bool methodCount = !strcmp(function, "MethodCount") || allFun; 2797 bool methodSpace = !strcmp(function, "MethodSpace") || allFun; 2798 bool methodAge = !strcmp(function, "MethodAge") || allFun; 2799 bool methodNames = !strcmp(function, "MethodNames") || allFun; 2800 bool discard = !strcmp(function, "discard") || allFun; 2801 2802 if (out == NULL) { 2803 out = tty; 2804 } 2805 2806 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) { 2807 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function); 2808 out->cr(); 2809 return; 2810 } 2811 2812 ts_total.update(); // record starting point 2813 2814 if (aggregate) { 2815 print_info(out); 2816 } 2817 2818 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function. 2819 // That prevents another thread from destroying our view on the CodeHeap. 2820 // When we request individual parts of the analysis via the jcmd interface, it is possible 2821 // that in between another thread (another jcmd user or the vm running into CodeCache OOM) 2822 // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock 2823 // across user interaction. 2824 // Acquire this lock before acquiring the CodeCache_lock. 2825 // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time, 2826 // leading to an unnecessarily long hold time of the CodeCache_lock. 2827 ts.update(); // record starting point 2828 MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag); 2829 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds()); 2830 2831 // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock 2832 // for the entire duration of aggregation and printing. That makes sure 2833 // we see a consistent picture and do not run into issues caused by 2834 // the CodeHeap being altered concurrently. 2835 Mutex* global_lock = allFun ? CodeCache_lock : NULL; 2836 Mutex* function_lock = allFun ? NULL : CodeCache_lock; 2837 ts_global.update(); // record starting point 2838 MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag); 2839 if (global_lock != NULL) { 2840 out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds()); 2841 ts_global.update(); // record starting point 2842 } 2843 2844 if (aggregate) { 2845 ts.update(); // record starting point 2846 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag); 2847 if (function_lock != NULL) { 2848 out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds()); 2849 } 2850 2851 ts.update(); // record starting point 2852 CodeCache::aggregate(out, granularity); 2853 if (function_lock != NULL) { 2854 out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds()); 2855 } 2856 } 2857 2858 if (usedSpace) CodeCache::print_usedSpace(out); 2859 if (freeSpace) CodeCache::print_freeSpace(out); 2860 if (methodCount) CodeCache::print_count(out); 2861 if (methodSpace) CodeCache::print_space(out); 2862 if (methodAge) CodeCache::print_age(out); 2863 if (methodNames) { 2864 // print_names() has shown to be sensitive to concurrent CodeHeap modifications. 2865 // Therefore, request the CodeCache_lock before calling... 2866 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag); 2867 CodeCache::print_names(out); 2868 } 2869 if (discard) CodeCache::discard(out); 2870 2871 if (global_lock != NULL) { 2872 out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds()); 2873 } 2874 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds()); 2875 }