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.CompilationMBean. 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 } 805 806 807 JavaThread* CompileBroker::make_thread(jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, Thread* THREAD) { 808 JavaThread* new_thread = NULL; 809 { 810 MutexLocker mu(THREAD, Threads_lock); 811 if (comp != NULL) { 812 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) { 813 CompilerCounters* counters = new CompilerCounters(); 814 new_thread = new CompilerThread(queue, counters); 815 } 816 } else { 817 new_thread = new CodeCacheSweeperThread(); 818 } 819 // At this point the new CompilerThread data-races with this startup 820 // thread (which I believe is the primoridal thread and NOT the VM 821 // thread). This means Java bytecodes being executed at startup can 822 // queue compile jobs which will run at whatever default priority the 823 // newly created CompilerThread runs at. 824 825 826 // At this point it may be possible that no osthread was created for the 827 // JavaThread due to lack of memory. We would have to throw an exception 828 // in that case. However, since this must work and we do not allow 829 // exceptions anyway, check and abort if this fails. But first release the 830 // lock. 831 832 if (new_thread != NULL && new_thread->osthread() != NULL) { 833 834 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), new_thread); 835 836 // Note that this only sets the JavaThread _priority field, which by 837 // definition is limited to Java priorities and not OS priorities. 838 // The os-priority is set in the CompilerThread startup code itself 839 840 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority); 841 842 // Note that we cannot call os::set_priority because it expects Java 843 // priorities and we are *explicitly* using OS priorities so that it's 844 // possible to set the compiler thread priority higher than any Java 845 // thread. 846 847 int native_prio = CompilerThreadPriority; 848 if (native_prio == -1) { 849 if (UseCriticalCompilerThreadPriority) { 850 native_prio = os::java_to_os_priority[CriticalPriority]; 851 } else { 852 native_prio = os::java_to_os_priority[NearMaxPriority]; 853 } 854 } 855 os::set_native_priority(new_thread, native_prio); 856 857 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle)); 858 859 new_thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle)); 860 if (comp != NULL) { 861 new_thread->as_CompilerThread()->set_compiler(comp); 862 } 863 Threads::add(new_thread); 864 Thread::start(new_thread); 865 } 866 } 867 868 // First release lock before aborting VM. 869 if (new_thread == NULL || new_thread->osthread() == NULL) { 870 if (UseDynamicNumberOfCompilerThreads && comp != NULL && comp->num_compiler_threads() > 0) { 871 if (new_thread != NULL) { 872 new_thread->smr_delete(); 873 } 874 return NULL; 875 } 876 vm_exit_during_initialization("java.lang.OutOfMemoryError", 877 os::native_thread_creation_failed_msg()); 878 } 879 880 // Let go of Threads_lock before yielding 881 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 882 883 return new_thread; 884 } 885 886 887 void CompileBroker::init_compiler_sweeper_threads() { 888 // Ensure any exceptions lead to vm_exit_during_initialization. 889 EXCEPTION_MARK; 890 #if !defined(ZERO) 891 assert(_c2_count > 0 || _c1_count > 0, "No compilers?"); 892 #endif // !ZERO 893 // Initialize the compilation queue 894 if (_c2_count > 0) { 895 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue"; 896 _c2_compile_queue = new CompileQueue(name); 897 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler); 898 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler); 899 } 900 if (_c1_count > 0) { 901 _c1_compile_queue = new CompileQueue("C1 compile queue"); 902 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler); 903 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler); 904 } 905 906 char name_buffer[256]; 907 908 for (int i = 0; i < _c2_count; i++) { 909 jobject thread_handle = NULL; 910 // Create all j.l.Thread objects for C1 and C2 threads here, but only one 911 // for JVMCI compiler which can create further ones on demand. 912 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {) 913 // Create a name for our thread. 914 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i); 915 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 916 thread_handle = JNIHandles::make_global(thread_oop); 917 JVMCI_ONLY(}) 918 _compiler2_objects[i] = thread_handle; 919 _compiler2_logs[i] = NULL; 920 921 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 922 JavaThread *ct = make_thread(thread_handle, _c2_compile_queue, _compilers[1], THREAD); 923 assert(ct != NULL, "should have been handled for initial thread"); 924 _compilers[1]->set_num_compiler_threads(i + 1); 925 if (TraceCompilerThreads) { 926 ResourceMark rm; 927 MutexLocker mu(Threads_lock); 928 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name()); 929 } 930 } 931 } 932 933 for (int i = 0; i < _c1_count; i++) { 934 // Create a name for our thread. 935 sprintf(name_buffer, "C1 CompilerThread%d", i); 936 Handle thread_oop = create_thread_oop(name_buffer, CHECK); 937 jobject thread_handle = JNIHandles::make_global(thread_oop); 938 _compiler1_objects[i] = thread_handle; 939 _compiler1_logs[i] = NULL; 940 941 if (!UseDynamicNumberOfCompilerThreads || i == 0) { 942 JavaThread *ct = make_thread(thread_handle, _c1_compile_queue, _compilers[0], THREAD); 943 assert(ct != NULL, "should have been handled for initial thread"); 944 _compilers[0]->set_num_compiler_threads(i + 1); 945 if (TraceCompilerThreads) { 946 ResourceMark rm; 947 MutexLocker mu(Threads_lock); 948 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name()); 949 } 950 } 951 } 952 953 if (UsePerfData) { 954 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK); 955 } 956 957 if (MethodFlushing) { 958 // Initialize the sweeper thread 959 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK); 960 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop()); 961 make_thread(thread_handle, NULL, NULL, THREAD); 962 } 963 } 964 965 void CompileBroker::possibly_add_compiler_threads(Thread* THREAD) { 966 967 julong available_memory = os::available_memory(); 968 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All). 969 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled), 970 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled); 971 972 // Only do attempt to start additional threads if the lock is free. 973 if (!CompileThread_lock->try_lock()) return; 974 975 if (_c2_compile_queue != NULL) { 976 int old_c2_count = _compilers[1]->num_compiler_threads(); 977 int new_c2_count = MIN4(_c2_count, 978 _c2_compile_queue->size() / 2, 979 (int)(available_memory / (200*M)), 980 (int)(available_cc_np / (128*K))); 981 982 for (int i = old_c2_count; i < new_c2_count; i++) { 983 #if INCLUDE_JVMCI 984 if (UseJVMCICompiler) { 985 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread 986 // objects as their existence is completely hidden from the rest of 987 // the VM (and those compiler threads can't call Java code to do the 988 // creation anyway). For JVMCI we have to create new j.l.Thread objects 989 // as they are visible and we can see unexpected thread lifecycle 990 // transitions if we bind them to new JavaThreads. 991 if (!THREAD->can_call_java()) break; 992 char name_buffer[256]; 993 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i); 994 Handle thread_oop; 995 { 996 // We have to give up the lock temporarily for the Java calls. 997 MutexUnlocker mu(CompileThread_lock); 998 thread_oop = create_thread_oop(name_buffer, THREAD); 999 } 1000 if (HAS_PENDING_EXCEPTION) { 1001 if (TraceCompilerThreads) { 1002 ResourceMark rm; 1003 tty->print_cr("JVMCI compiler thread creation failed:"); 1004 PENDING_EXCEPTION->print(); 1005 } 1006 CLEAR_PENDING_EXCEPTION; 1007 break; 1008 } 1009 // Check if another thread has beaten us during the Java calls. 1010 if (_compilers[1]->num_compiler_threads() != i) break; 1011 jobject thread_handle = JNIHandles::make_global(thread_oop); 1012 assert(compiler2_object(i) == NULL, "Old one must be released!"); 1013 _compiler2_objects[i] = thread_handle; 1014 } 1015 #endif 1016 JavaThread *ct = make_thread(compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD); 1017 if (ct == NULL) break; 1018 _compilers[1]->set_num_compiler_threads(i + 1); 1019 if (TraceCompilerThreads) { 1020 ResourceMark rm; 1021 MutexLocker mu(Threads_lock); 1022 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)", 1023 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M)); 1024 } 1025 } 1026 } 1027 1028 if (_c1_compile_queue != NULL) { 1029 int old_c1_count = _compilers[0]->num_compiler_threads(); 1030 int new_c1_count = MIN4(_c1_count, 1031 _c1_compile_queue->size() / 4, 1032 (int)(available_memory / (100*M)), 1033 (int)(available_cc_p / (128*K))); 1034 1035 for (int i = old_c1_count; i < new_c1_count; i++) { 1036 JavaThread *ct = make_thread(compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD); 1037 if (ct == NULL) break; 1038 _compilers[0]->set_num_compiler_threads(i + 1); 1039 if (TraceCompilerThreads) { 1040 ResourceMark rm; 1041 MutexLocker mu(Threads_lock); 1042 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)", 1043 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M)); 1044 } 1045 } 1046 } 1047 1048 CompileThread_lock->unlock(); 1049 } 1050 1051 1052 /** 1053 * Set the methods on the stack as on_stack so that redefine classes doesn't 1054 * reclaim them. This method is executed at a safepoint. 1055 */ 1056 void CompileBroker::mark_on_stack() { 1057 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1058 // Since we are at a safepoint, we do not need a lock to access 1059 // the compile queues. 1060 if (_c2_compile_queue != NULL) { 1061 _c2_compile_queue->mark_on_stack(); 1062 } 1063 if (_c1_compile_queue != NULL) { 1064 _c1_compile_queue->mark_on_stack(); 1065 } 1066 } 1067 1068 // ------------------------------------------------------------------ 1069 // CompileBroker::compile_method 1070 // 1071 // Request compilation of a method. 1072 void CompileBroker::compile_method_base(const methodHandle& method, 1073 int osr_bci, 1074 int comp_level, 1075 const methodHandle& hot_method, 1076 int hot_count, 1077 CompileTask::CompileReason compile_reason, 1078 bool blocking, 1079 Thread* thread) { 1080 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1081 assert(method->method_holder()->is_instance_klass(), 1082 "sanity check"); 1083 assert(!method->method_holder()->is_not_initialized(), 1084 "method holder must be initialized"); 1085 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1086 1087 if (CIPrintRequests) { 1088 tty->print("request: "); 1089 method->print_short_name(tty); 1090 if (osr_bci != InvocationEntryBci) { 1091 tty->print(" osr_bci: %d", osr_bci); 1092 } 1093 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count); 1094 if (!hot_method.is_null()) { 1095 tty->print(" hot: "); 1096 if (hot_method() != method()) { 1097 hot_method->print_short_name(tty); 1098 } else { 1099 tty->print("yes"); 1100 } 1101 } 1102 tty->cr(); 1103 } 1104 1105 // A request has been made for compilation. Before we do any 1106 // real work, check to see if the method has been compiled 1107 // in the meantime with a definitive result. 1108 if (compilation_is_complete(method, osr_bci, comp_level)) { 1109 return; 1110 } 1111 1112 #ifndef PRODUCT 1113 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1114 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1115 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1116 return; 1117 } 1118 } 1119 #endif 1120 1121 // If this method is already in the compile queue, then 1122 // we do not block the current thread. 1123 if (compilation_is_in_queue(method)) { 1124 // We may want to decay our counter a bit here to prevent 1125 // multiple denied requests for compilation. This is an 1126 // open compilation policy issue. Note: The other possibility, 1127 // in the case that this is a blocking compile request, is to have 1128 // all subsequent blocking requesters wait for completion of 1129 // ongoing compiles. Note that in this case we'll need a protocol 1130 // for freeing the associated compile tasks. [Or we could have 1131 // a single static monitor on which all these waiters sleep.] 1132 return; 1133 } 1134 1135 if (TieredCompilation) { 1136 // Tiered policy requires MethodCounters to exist before adding a method to 1137 // the queue. Create if we don't have them yet. 1138 method->get_method_counters(thread); 1139 } 1140 1141 // Outputs from the following MutexLocker block: 1142 CompileTask* task = NULL; 1143 CompileQueue* queue = compile_queue(comp_level); 1144 1145 // Acquire our lock. 1146 { 1147 MutexLocker locker(thread, MethodCompileQueue_lock); 1148 1149 // Make sure the method has not slipped into the queues since 1150 // last we checked; note that those checks were "fast bail-outs". 1151 // Here we need to be more careful, see 14012000 below. 1152 if (compilation_is_in_queue(method)) { 1153 return; 1154 } 1155 1156 // We need to check again to see if the compilation has 1157 // completed. A previous compilation may have registered 1158 // some result. 1159 if (compilation_is_complete(method, osr_bci, comp_level)) { 1160 return; 1161 } 1162 1163 // We now know that this compilation is not pending, complete, 1164 // or prohibited. Assign a compile_id to this compilation 1165 // and check to see if it is in our [Start..Stop) range. 1166 int compile_id = assign_compile_id(method, osr_bci); 1167 if (compile_id == 0) { 1168 // The compilation falls outside the allowed range. 1169 return; 1170 } 1171 1172 #if INCLUDE_JVMCI 1173 if (UseJVMCICompiler && blocking) { 1174 // Don't allow blocking compiles for requests triggered by JVMCI. 1175 if (thread->is_Compiler_thread()) { 1176 blocking = false; 1177 } 1178 1179 if (!UseJVMCINativeLibrary) { 1180 // Don't allow blocking compiles if inside a class initializer or while performing class loading 1181 vframeStream vfst((JavaThread*) thread); 1182 for (; !vfst.at_end(); vfst.next()) { 1183 if (vfst.method()->is_static_initializer() || 1184 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) && 1185 vfst.method()->name() == vmSymbols::loadClass_name())) { 1186 blocking = false; 1187 break; 1188 } 1189 } 1190 } 1191 1192 // Don't allow blocking compilation requests to JVMCI 1193 // if JVMCI itself is not yet initialized 1194 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) { 1195 blocking = false; 1196 } 1197 1198 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown 1199 // to avoid deadlock between compiler thread(s) and threads run at shutdown 1200 // such as the DestroyJavaVM thread. 1201 if (JVMCI::shutdown_called()) { 1202 blocking = false; 1203 } 1204 } 1205 #endif // INCLUDE_JVMCI 1206 1207 // We will enter the compilation in the queue. 1208 // 14012000: Note that this sets the queued_for_compile bits in 1209 // the target method. We can now reason that a method cannot be 1210 // queued for compilation more than once, as follows: 1211 // Before a thread queues a task for compilation, it first acquires 1212 // the compile queue lock, then checks if the method's queued bits 1213 // are set or it has already been compiled. Thus there can not be two 1214 // instances of a compilation task for the same method on the 1215 // compilation queue. Consider now the case where the compilation 1216 // thread has already removed a task for that method from the queue 1217 // and is in the midst of compiling it. In this case, the 1218 // queued_for_compile bits must be set in the method (and these 1219 // will be visible to the current thread, since the bits were set 1220 // under protection of the compile queue lock, which we hold now. 1221 // When the compilation completes, the compiler thread first sets 1222 // the compilation result and then clears the queued_for_compile 1223 // bits. Neither of these actions are protected by a barrier (or done 1224 // under the protection of a lock), so the only guarantee we have 1225 // (on machines with TSO (Total Store Order)) is that these values 1226 // will update in that order. As a result, the only combinations of 1227 // these bits that the current thread will see are, in temporal order: 1228 // <RESULT, QUEUE> : 1229 // <0, 1> : in compile queue, but not yet compiled 1230 // <1, 1> : compiled but queue bit not cleared 1231 // <1, 0> : compiled and queue bit cleared 1232 // Because we first check the queue bits then check the result bits, 1233 // we are assured that we cannot introduce a duplicate task. 1234 // Note that if we did the tests in the reverse order (i.e. check 1235 // result then check queued bit), we could get the result bit before 1236 // the compilation completed, and the queue bit after the compilation 1237 // completed, and end up introducing a "duplicate" (redundant) task. 1238 // In that case, the compiler thread should first check if a method 1239 // has already been compiled before trying to compile it. 1240 // NOTE: in the event that there are multiple compiler threads and 1241 // there is de-optimization/recompilation, things will get hairy, 1242 // and in that case it's best to protect both the testing (here) of 1243 // these bits, and their updating (here and elsewhere) under a 1244 // common lock. 1245 task = create_compile_task(queue, 1246 compile_id, method, 1247 osr_bci, comp_level, 1248 hot_method, hot_count, compile_reason, 1249 blocking); 1250 } 1251 1252 if (blocking) { 1253 wait_for_completion(task); 1254 } 1255 } 1256 1257 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1258 int comp_level, 1259 const methodHandle& hot_method, int hot_count, 1260 CompileTask::CompileReason compile_reason, 1261 Thread* THREAD) { 1262 // Do nothing if compilebroker is not initalized or compiles are submitted on level none 1263 if (!_initialized || comp_level == CompLevel_none) { 1264 return NULL; 1265 } 1266 1267 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1268 assert(comp != NULL, "Ensure we have a compiler"); 1269 1270 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp); 1271 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD); 1272 DirectivesStack::release(directive); 1273 return nm; 1274 } 1275 1276 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci, 1277 int comp_level, 1278 const methodHandle& hot_method, int hot_count, 1279 CompileTask::CompileReason compile_reason, 1280 DirectiveSet* directive, 1281 Thread* THREAD) { 1282 1283 // make sure arguments make sense 1284 assert(method->method_holder()->is_instance_klass(), "not an instance method"); 1285 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1286 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1287 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1288 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level"); 1289 // allow any levels for WhiteBox 1290 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1291 // return quickly if possible 1292 1293 // lock, make sure that the compilation 1294 // isn't prohibited in a straightforward way. 1295 AbstractCompiler* comp = CompileBroker::compiler(comp_level); 1296 if (comp == NULL || !comp->can_compile_method(method) || 1297 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) { 1298 return NULL; 1299 } 1300 1301 #if INCLUDE_JVMCI 1302 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) { 1303 return NULL; 1304 } 1305 #endif 1306 1307 if (osr_bci == InvocationEntryBci) { 1308 // standard compilation 1309 CompiledMethod* method_code = method->code(); 1310 if (method_code != NULL && method_code->is_nmethod()) { 1311 if (compilation_is_complete(method, osr_bci, comp_level)) { 1312 return (nmethod*) method_code; 1313 } 1314 } 1315 if (method->is_not_compilable(comp_level)) { 1316 return NULL; 1317 } 1318 } else { 1319 // osr compilation 1320 #ifndef TIERED 1321 // seems like an assert of dubious value 1322 assert(comp_level == CompLevel_highest_tier, 1323 "all OSR compiles are assumed to be at a single compilation level"); 1324 #endif // TIERED 1325 // We accept a higher level osr method 1326 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1327 if (nm != NULL) return nm; 1328 if (method->is_not_osr_compilable(comp_level)) return NULL; 1329 } 1330 1331 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1332 // some prerequisites that are compiler specific 1333 if (comp->is_c2()) { 1334 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1335 // Resolve all classes seen in the signature of the method 1336 // we are compiling. 1337 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1338 } 1339 1340 // If the method is native, do the lookup in the thread requesting 1341 // the compilation. Native lookups can load code, which is not 1342 // permitted during compilation. 1343 // 1344 // Note: A native method implies non-osr compilation which is 1345 // checked with an assertion at the entry of this method. 1346 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1347 bool in_base_library; 1348 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1349 if (HAS_PENDING_EXCEPTION) { 1350 // In case of an exception looking up the method, we just forget 1351 // about it. The interpreter will kick-in and throw the exception. 1352 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable() 1353 CLEAR_PENDING_EXCEPTION; 1354 return NULL; 1355 } 1356 assert(method->has_native_function(), "must have native code by now"); 1357 } 1358 1359 // RedefineClasses() has replaced this method; just return 1360 if (method->is_old()) { 1361 return NULL; 1362 } 1363 1364 // JVMTI -- post_compile_event requires jmethod_id() that may require 1365 // a lock the compiling thread can not acquire. Prefetch it here. 1366 if (JvmtiExport::should_post_compiled_method_load()) { 1367 method->jmethod_id(); 1368 } 1369 1370 // do the compilation 1371 if (method->is_native()) { 1372 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1373 #if defined(X86) && !defined(ZERO) 1374 // The following native methods: 1375 // 1376 // java.lang.Float.intBitsToFloat 1377 // java.lang.Float.floatToRawIntBits 1378 // java.lang.Double.longBitsToDouble 1379 // java.lang.Double.doubleToRawLongBits 1380 // 1381 // are called through the interpreter even if interpreter native stubs 1382 // are not preferred (i.e., calling through adapter handlers is preferred). 1383 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved 1384 // if the version of the methods from the native libraries is called. 1385 // As the interpreter and the C2-intrinsified version of the methods preserves 1386 // sNaNs, that would result in an inconsistent way of handling of sNaNs. 1387 if ((UseSSE >= 1 && 1388 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat || 1389 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) || 1390 (UseSSE >= 2 && 1391 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble || 1392 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) { 1393 return NULL; 1394 } 1395 #endif // X86 && !ZERO 1396 1397 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1398 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1399 // 1400 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1401 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1402 AdapterHandlerLibrary::create_native_wrapper(method); 1403 } else { 1404 return NULL; 1405 } 1406 } else { 1407 // If the compiler is shut off due to code cache getting full 1408 // fail out now so blocking compiles dont hang the java thread 1409 if (!should_compile_new_jobs()) { 1410 CompilationPolicy::policy()->delay_compilation(method()); 1411 return NULL; 1412 } 1413 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles; 1414 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD); 1415 } 1416 1417 // return requested nmethod 1418 // We accept a higher level osr method 1419 if (osr_bci == InvocationEntryBci) { 1420 CompiledMethod* code = method->code(); 1421 if (code == NULL) { 1422 return (nmethod*) code; 1423 } else { 1424 return code->as_nmethod_or_null(); 1425 } 1426 } 1427 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1428 } 1429 1430 1431 // ------------------------------------------------------------------ 1432 // CompileBroker::compilation_is_complete 1433 // 1434 // See if compilation of this method is already complete. 1435 bool CompileBroker::compilation_is_complete(const methodHandle& method, 1436 int osr_bci, 1437 int comp_level) { 1438 bool is_osr = (osr_bci != standard_entry_bci); 1439 if (is_osr) { 1440 if (method->is_not_osr_compilable(comp_level)) { 1441 return true; 1442 } else { 1443 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1444 return (result != NULL); 1445 } 1446 } else { 1447 if (method->is_not_compilable(comp_level)) { 1448 return true; 1449 } else { 1450 CompiledMethod* result = method->code(); 1451 if (result == NULL) return false; 1452 return comp_level == result->comp_level(); 1453 } 1454 } 1455 } 1456 1457 1458 /** 1459 * See if this compilation is already requested. 1460 * 1461 * Implementation note: there is only a single "is in queue" bit 1462 * for each method. This means that the check below is overly 1463 * conservative in the sense that an osr compilation in the queue 1464 * will block a normal compilation from entering the queue (and vice 1465 * versa). This can be remedied by a full queue search to disambiguate 1466 * cases. If it is deemed profitable, this may be done. 1467 */ 1468 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) { 1469 return method->queued_for_compilation(); 1470 } 1471 1472 // ------------------------------------------------------------------ 1473 // CompileBroker::compilation_is_prohibited 1474 // 1475 // See if this compilation is not allowed. 1476 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) { 1477 bool is_native = method->is_native(); 1478 // Some compilers may not support the compilation of natives. 1479 AbstractCompiler *comp = compiler(comp_level); 1480 if (is_native && 1481 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1482 method->set_not_compilable_quietly("native methods not supported", comp_level); 1483 return true; 1484 } 1485 1486 bool is_osr = (osr_bci != standard_entry_bci); 1487 // Some compilers may not support on stack replacement. 1488 if (is_osr && 1489 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1490 method->set_not_osr_compilable("OSR not supported", comp_level); 1491 return true; 1492 } 1493 1494 // The method may be explicitly excluded by the user. 1495 double scale; 1496 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) { 1497 bool quietly = CompilerOracle::should_exclude_quietly(); 1498 if (PrintCompilation && !quietly) { 1499 // This does not happen quietly... 1500 ResourceMark rm; 1501 tty->print("### Excluding %s:%s", 1502 method->is_native() ? "generation of native wrapper" : "compile", 1503 (method->is_static() ? " static" : "")); 1504 method->print_short_name(tty); 1505 tty->cr(); 1506 } 1507 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly); 1508 } 1509 1510 return false; 1511 } 1512 1513 /** 1514 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1515 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1516 * The function also allows to generate separate compilation IDs for OSR compilations. 1517 */ 1518 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) { 1519 #ifdef ASSERT 1520 bool is_osr = (osr_bci != standard_entry_bci); 1521 int id; 1522 if (method->is_native()) { 1523 assert(!is_osr, "can't be osr"); 1524 // Adapters, native wrappers and method handle intrinsics 1525 // should be generated always. 1526 return Atomic::add(&_compilation_id, 1); 1527 } else if (CICountOSR && is_osr) { 1528 id = Atomic::add(&_osr_compilation_id, 1); 1529 if (CIStartOSR <= id && id < CIStopOSR) { 1530 return id; 1531 } 1532 } else { 1533 id = Atomic::add(&_compilation_id, 1); 1534 if (CIStart <= id && id < CIStop) { 1535 return id; 1536 } 1537 } 1538 1539 // Method was not in the appropriate compilation range. 1540 method->set_not_compilable_quietly("Not in requested compile id range"); 1541 return 0; 1542 #else 1543 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1544 // only _compilation_id is incremented. 1545 return Atomic::add(&_compilation_id, 1); 1546 #endif 1547 } 1548 1549 // ------------------------------------------------------------------ 1550 // CompileBroker::assign_compile_id_unlocked 1551 // 1552 // Public wrapper for assign_compile_id that acquires the needed locks 1553 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) { 1554 MutexLocker locker(thread, MethodCompileQueue_lock); 1555 return assign_compile_id(method, osr_bci); 1556 } 1557 1558 // ------------------------------------------------------------------ 1559 // CompileBroker::create_compile_task 1560 // 1561 // Create a CompileTask object representing the current request for 1562 // compilation. Add this task to the queue. 1563 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1564 int compile_id, 1565 const methodHandle& method, 1566 int osr_bci, 1567 int comp_level, 1568 const methodHandle& hot_method, 1569 int hot_count, 1570 CompileTask::CompileReason compile_reason, 1571 bool blocking) { 1572 CompileTask* new_task = CompileTask::allocate(); 1573 new_task->initialize(compile_id, method, osr_bci, comp_level, 1574 hot_method, hot_count, compile_reason, 1575 blocking); 1576 queue->add(new_task); 1577 return new_task; 1578 } 1579 1580 #if INCLUDE_JVMCI 1581 // The number of milliseconds to wait before checking if 1582 // JVMCI compilation has made progress. 1583 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000; 1584 1585 // The number of JVMCI compilation progress checks that must fail 1586 // before unblocking a thread waiting for a blocking compilation. 1587 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10; 1588 1589 /** 1590 * Waits for a JVMCI compiler to complete a given task. This thread 1591 * waits until either the task completes or it sees no JVMCI compilation 1592 * progress for N consecutive milliseconds where N is 1593 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE * 1594 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS. 1595 * 1596 * @return true if this thread needs to free/recycle the task 1597 */ 1598 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) { 1599 MonitorLocker ml(thread, task->lock()); 1600 int progress_wait_attempts = 0; 1601 int methods_compiled = jvmci->methods_compiled(); 1602 while (!task->is_complete() && !is_compilation_disabled_forever() && 1603 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) { 1604 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread(); 1605 1606 bool progress; 1607 if (jvmci_compiler_thread != NULL) { 1608 // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress. 1609 progress = jvmci_compiler_thread->thread_state() != _thread_blocked && 1610 !jvmci_compiler_thread->is_external_suspend(); 1611 } else { 1612 // Still waiting on JVMCI compiler queue. This thread may be holding a lock 1613 // that all JVMCI compiler threads are blocked on. We use the counter for 1614 // successful JVMCI compilations to determine whether JVMCI compilation 1615 // is still making progress through the JVMCI compiler queue. 1616 progress = jvmci->methods_compiled() != methods_compiled; 1617 } 1618 1619 if (!progress) { 1620 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) { 1621 if (PrintCompilation) { 1622 task->print(tty, "wait for blocking compilation timed out"); 1623 } 1624 break; 1625 } 1626 } else { 1627 progress_wait_attempts = 0; 1628 if (jvmci_compiler_thread == NULL) { 1629 methods_compiled = jvmci->methods_compiled(); 1630 } 1631 } 1632 } 1633 task->clear_waiter(); 1634 return task->is_complete(); 1635 } 1636 #endif 1637 1638 /** 1639 * Wait for the compilation task to complete. 1640 */ 1641 void CompileBroker::wait_for_completion(CompileTask* task) { 1642 if (CIPrintCompileQueue) { 1643 ttyLocker ttyl; 1644 tty->print_cr("BLOCKING FOR COMPILE"); 1645 } 1646 1647 assert(task->is_blocking(), "can only wait on blocking task"); 1648 1649 JavaThread* thread = JavaThread::current(); 1650 1651 methodHandle method(thread, task->method()); 1652 bool free_task; 1653 #if INCLUDE_JVMCI 1654 AbstractCompiler* comp = compiler(task->comp_level()); 1655 if (comp->is_jvmci()) { 1656 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread); 1657 } else 1658 #endif 1659 { 1660 MonitorLocker ml(thread, task->lock()); 1661 free_task = true; 1662 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1663 ml.wait(); 1664 } 1665 } 1666 1667 if (free_task) { 1668 if (is_compilation_disabled_forever()) { 1669 CompileTask::free(task); 1670 return; 1671 } 1672 1673 // It is harmless to check this status without the lock, because 1674 // completion is a stable property (until the task object is recycled). 1675 assert(task->is_complete(), "Compilation should have completed"); 1676 assert(task->code_handle() == NULL, "must be reset"); 1677 1678 // By convention, the waiter is responsible for recycling a 1679 // blocking CompileTask. Since there is only one waiter ever 1680 // waiting on a CompileTask, we know that no one else will 1681 // be using this CompileTask; we can free it. 1682 CompileTask::free(task); 1683 } 1684 } 1685 1686 /** 1687 * Initialize compiler thread(s) + compiler object(s). The postcondition 1688 * of this function is that the compiler runtimes are initialized and that 1689 * compiler threads can start compiling. 1690 */ 1691 bool CompileBroker::init_compiler_runtime() { 1692 CompilerThread* thread = CompilerThread::current(); 1693 AbstractCompiler* comp = thread->compiler(); 1694 // Final sanity check - the compiler object must exist 1695 guarantee(comp != NULL, "Compiler object must exist"); 1696 1697 { 1698 // Must switch to native to allocate ci_env 1699 ThreadToNativeFromVM ttn(thread); 1700 ciEnv ci_env((CompileTask*)NULL); 1701 // Cache Jvmti state 1702 ci_env.cache_jvmti_state(); 1703 // Cache DTrace flags 1704 ci_env.cache_dtrace_flags(); 1705 1706 // Switch back to VM state to do compiler initialization 1707 ThreadInVMfromNative tv(thread); 1708 ResetNoHandleMark rnhm; 1709 1710 // Perform per-thread and global initializations 1711 comp->initialize(); 1712 } 1713 1714 if (comp->is_failed()) { 1715 disable_compilation_forever(); 1716 // If compiler initialization failed, no compiler thread that is specific to a 1717 // particular compiler runtime will ever start to compile methods. 1718 shutdown_compiler_runtime(comp, thread); 1719 return false; 1720 } 1721 1722 // C1 specific check 1723 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1724 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1725 return false; 1726 } 1727 1728 return true; 1729 } 1730 1731 /** 1732 * If C1 and/or C2 initialization failed, we shut down all compilation. 1733 * We do this to keep things simple. This can be changed if it ever turns 1734 * out to be a problem. 1735 */ 1736 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1737 // Free buffer blob, if allocated 1738 if (thread->get_buffer_blob() != NULL) { 1739 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1740 CodeCache::free(thread->get_buffer_blob()); 1741 } 1742 1743 if (comp->should_perform_shutdown()) { 1744 // There are two reasons for shutting down the compiler 1745 // 1) compiler runtime initialization failed 1746 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1747 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1748 1749 // Only one thread per compiler runtime object enters here 1750 // Set state to shut down 1751 comp->set_shut_down(); 1752 1753 // Delete all queued compilation tasks to make compiler threads exit faster. 1754 if (_c1_compile_queue != NULL) { 1755 _c1_compile_queue->free_all(); 1756 } 1757 1758 if (_c2_compile_queue != NULL) { 1759 _c2_compile_queue->free_all(); 1760 } 1761 1762 // Set flags so that we continue execution with using interpreter only. 1763 UseCompiler = false; 1764 UseInterpreter = true; 1765 1766 // We could delete compiler runtimes also. However, there are references to 1767 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1768 // fail. This can be done later if necessary. 1769 } 1770 } 1771 1772 /** 1773 * Helper function to create new or reuse old CompileLog. 1774 */ 1775 CompileLog* CompileBroker::get_log(CompilerThread* ct) { 1776 if (!LogCompilation) return NULL; 1777 1778 AbstractCompiler *compiler = ct->compiler(); 1779 bool c1 = compiler->is_c1(); 1780 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects; 1781 assert(compiler_objects != NULL, "must be initialized at this point"); 1782 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs; 1783 assert(logs != NULL, "must be initialized at this point"); 1784 int count = c1 ? _c1_count : _c2_count; 1785 1786 // Find Compiler number by its threadObj. 1787 oop compiler_obj = ct->threadObj(); 1788 int compiler_number = 0; 1789 bool found = false; 1790 for (; compiler_number < count; compiler_number++) { 1791 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) { 1792 found = true; 1793 break; 1794 } 1795 } 1796 assert(found, "Compiler must exist at this point"); 1797 1798 // Determine pointer for this thread's log. 1799 CompileLog** log_ptr = &logs[compiler_number]; 1800 1801 // Return old one if it exists. 1802 CompileLog* log = *log_ptr; 1803 if (log != NULL) { 1804 ct->init_log(log); 1805 return log; 1806 } 1807 1808 // Create a new one and remember it. 1809 init_compiler_thread_log(); 1810 log = ct->log(); 1811 *log_ptr = log; 1812 return log; 1813 } 1814 1815 // ------------------------------------------------------------------ 1816 // CompileBroker::compiler_thread_loop 1817 // 1818 // The main loop run by a CompilerThread. 1819 void CompileBroker::compiler_thread_loop() { 1820 CompilerThread* thread = CompilerThread::current(); 1821 CompileQueue* queue = thread->queue(); 1822 // For the thread that initializes the ciObjectFactory 1823 // this resource mark holds all the shared objects 1824 ResourceMark rm; 1825 1826 // First thread to get here will initialize the compiler interface 1827 1828 { 1829 ASSERT_IN_VM; 1830 MutexLocker only_one (thread, CompileThread_lock); 1831 if (!ciObjectFactory::is_initialized()) { 1832 ciObjectFactory::initialize(); 1833 } 1834 } 1835 1836 // Open a log. 1837 CompileLog* log = get_log(thread); 1838 if (log != NULL) { 1839 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1840 thread->name(), 1841 os::current_thread_id(), 1842 os::current_process_id()); 1843 log->stamp(); 1844 log->end_elem(); 1845 } 1846 1847 // If compiler thread/runtime initialization fails, exit the compiler thread 1848 if (!init_compiler_runtime()) { 1849 return; 1850 } 1851 1852 thread->start_idle_timer(); 1853 1854 // Poll for new compilation tasks as long as the JVM runs. Compilation 1855 // should only be disabled if something went wrong while initializing the 1856 // compiler runtimes. This, in turn, should not happen. The only known case 1857 // when compiler runtime initialization fails is if there is not enough free 1858 // space in the code cache to generate the necessary stubs, etc. 1859 while (!is_compilation_disabled_forever()) { 1860 // We need this HandleMark to avoid leaking VM handles. 1861 HandleMark hm(thread); 1862 1863 CompileTask* task = queue->get(); 1864 if (task == NULL) { 1865 if (UseDynamicNumberOfCompilerThreads) { 1866 // Access compiler_count under lock to enforce consistency. 1867 MutexLocker only_one(CompileThread_lock); 1868 if (can_remove(thread, true)) { 1869 if (TraceCompilerThreads) { 1870 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time", 1871 thread->name(), thread->idle_time_millis()); 1872 } 1873 // Free buffer blob, if allocated 1874 if (thread->get_buffer_blob() != NULL) { 1875 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1876 CodeCache::free(thread->get_buffer_blob()); 1877 } 1878 return; // Stop this thread. 1879 } 1880 } 1881 } else { 1882 // Assign the task to the current thread. Mark this compilation 1883 // thread as active for the profiler. 1884 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition 1885 // occurs after fetching the compile task off the queue. 1886 CompileTaskWrapper ctw(task); 1887 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1888 task->set_code_handle(&result_handle); 1889 methodHandle method(thread, task->method()); 1890 1891 // Never compile a method if breakpoints are present in it 1892 if (method()->number_of_breakpoints() == 0) { 1893 // Compile the method. 1894 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1895 invoke_compiler_on_method(task); 1896 thread->start_idle_timer(); 1897 } else { 1898 // After compilation is disabled, remove remaining methods from queue 1899 method->clear_queued_for_compilation(); 1900 task->set_failure_reason("compilation is disabled"); 1901 } 1902 } 1903 1904 if (UseDynamicNumberOfCompilerThreads) { 1905 possibly_add_compiler_threads(thread); 1906 assert(!thread->has_pending_exception(), "should have been handled"); 1907 } 1908 } 1909 } 1910 1911 // Shut down compiler runtime 1912 shutdown_compiler_runtime(thread->compiler(), thread); 1913 } 1914 1915 // ------------------------------------------------------------------ 1916 // CompileBroker::init_compiler_thread_log 1917 // 1918 // Set up state required by +LogCompilation. 1919 void CompileBroker::init_compiler_thread_log() { 1920 CompilerThread* thread = CompilerThread::current(); 1921 char file_name[4*K]; 1922 FILE* fp = NULL; 1923 intx thread_id = os::current_thread_id(); 1924 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1925 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1926 if (dir == NULL) { 1927 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1928 thread_id, os::current_process_id()); 1929 } else { 1930 jio_snprintf(file_name, sizeof(file_name), 1931 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1932 os::file_separator(), thread_id, os::current_process_id()); 1933 } 1934 1935 fp = fopen(file_name, "wt"); 1936 if (fp != NULL) { 1937 if (LogCompilation && Verbose) { 1938 tty->print_cr("Opening compilation log %s", file_name); 1939 } 1940 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1941 if (log == NULL) { 1942 fclose(fp); 1943 return; 1944 } 1945 thread->init_log(log); 1946 1947 if (xtty != NULL) { 1948 ttyLocker ttyl; 1949 // Record any per thread log files 1950 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1951 } 1952 return; 1953 } 1954 } 1955 warning("Cannot open log file: %s", file_name); 1956 } 1957 1958 void CompileBroker::log_metaspace_failure() { 1959 const char* message = "some methods may not be compiled because metaspace " 1960 "is out of memory"; 1961 if (_compilation_log != NULL) { 1962 _compilation_log->log_metaspace_failure(message); 1963 } 1964 if (PrintCompilation) { 1965 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message); 1966 } 1967 } 1968 1969 1970 // ------------------------------------------------------------------ 1971 // CompileBroker::set_should_block 1972 // 1973 // Set _should_block. 1974 // Call this from the VM, with Threads_lock held and a safepoint requested. 1975 void CompileBroker::set_should_block() { 1976 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1977 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1978 #ifndef PRODUCT 1979 if (PrintCompilation && (Verbose || WizardMode)) 1980 tty->print_cr("notifying compiler thread pool to block"); 1981 #endif 1982 _should_block = true; 1983 } 1984 1985 // ------------------------------------------------------------------ 1986 // CompileBroker::maybe_block 1987 // 1988 // Call this from the compiler at convenient points, to poll for _should_block. 1989 void CompileBroker::maybe_block() { 1990 if (_should_block) { 1991 #ifndef PRODUCT 1992 if (PrintCompilation && (Verbose || WizardMode)) 1993 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1994 #endif 1995 ThreadInVMfromNative tivfn(JavaThread::current()); 1996 } 1997 } 1998 1999 // wrapper for CodeCache::print_summary() 2000 static void codecache_print(bool detailed) 2001 { 2002 ResourceMark rm; 2003 stringStream s; 2004 // Dump code cache into a buffer before locking the tty, 2005 { 2006 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2007 CodeCache::print_summary(&s, detailed); 2008 } 2009 ttyLocker ttyl; 2010 tty->print("%s", s.as_string()); 2011 } 2012 2013 // wrapper for CodeCache::print_summary() using outputStream 2014 static void codecache_print(outputStream* out, bool detailed) { 2015 ResourceMark rm; 2016 stringStream s; 2017 2018 // Dump code cache into a buffer 2019 { 2020 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 2021 CodeCache::print_summary(&s, detailed); 2022 } 2023 2024 char* remaining_log = s.as_string(); 2025 while (*remaining_log != '\0') { 2026 char* eol = strchr(remaining_log, '\n'); 2027 if (eol == NULL) { 2028 out->print_cr("%s", remaining_log); 2029 remaining_log = remaining_log + strlen(remaining_log); 2030 } else { 2031 *eol = '\0'; 2032 out->print_cr("%s", remaining_log); 2033 remaining_log = eol + 1; 2034 } 2035 } 2036 } 2037 2038 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env, 2039 int compilable, const char* failure_reason) { 2040 if (success) { 2041 task->mark_success(); 2042 if (ci_env != NULL) { 2043 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes()); 2044 } 2045 if (_compilation_log != NULL) { 2046 nmethod* code = task->code(); 2047 if (code != NULL) { 2048 _compilation_log->log_nmethod(thread, code); 2049 } 2050 } 2051 } else if (AbortVMOnCompilationFailure) { 2052 if (compilable == ciEnv::MethodCompilable_not_at_tier) { 2053 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason); 2054 } 2055 if (compilable == ciEnv::MethodCompilable_never) { 2056 fatal("Never compilable: %s", failure_reason); 2057 } 2058 } 2059 // simulate crash during compilation 2060 assert(task->compile_id() != CICrashAt, "just as planned"); 2061 } 2062 2063 static void post_compilation_event(EventCompilation& event, CompileTask* task) { 2064 assert(task != NULL, "invariant"); 2065 CompilerEvent::CompilationEvent::post(event, 2066 task->compile_id(), 2067 task->compiler()->type(), 2068 task->method(), 2069 task->comp_level(), 2070 task->is_success(), 2071 task->osr_bci() != CompileBroker::standard_entry_bci, 2072 (task->code() == NULL) ? 0 : task->code()->total_size(), 2073 task->num_inlined_bytecodes()); 2074 } 2075 2076 int DirectivesStack::_depth = 0; 2077 CompilerDirectives* DirectivesStack::_top = NULL; 2078 CompilerDirectives* DirectivesStack::_bottom = NULL; 2079 2080 // ------------------------------------------------------------------ 2081 // CompileBroker::invoke_compiler_on_method 2082 // 2083 // Compile a method. 2084 // 2085 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 2086 task->print_ul(); 2087 if (PrintCompilation) { 2088 ResourceMark rm; 2089 task->print_tty(); 2090 } 2091 elapsedTimer time; 2092 2093 CompilerThread* thread = CompilerThread::current(); 2094 ResourceMark rm(thread); 2095 2096 if (LogEvents) { 2097 _compilation_log->log_compile(thread, task); 2098 } 2099 2100 // Common flags. 2101 uint compile_id = task->compile_id(); 2102 int osr_bci = task->osr_bci(); 2103 bool is_osr = (osr_bci != standard_entry_bci); 2104 bool should_log = (thread->log() != NULL); 2105 bool should_break = false; 2106 const int task_level = task->comp_level(); 2107 AbstractCompiler* comp = task->compiler(); 2108 2109 DirectiveSet* directive; 2110 { 2111 // create the handle inside it's own block so it can't 2112 // accidentally be referenced once the thread transitions to 2113 // native. The NoHandleMark before the transition should catch 2114 // any cases where this occurs in the future. 2115 methodHandle method(thread, task->method()); 2116 assert(!method->is_native(), "no longer compile natives"); 2117 2118 // Look up matching directives 2119 directive = DirectivesStack::getMatchingDirective(method, comp); 2120 2121 // Update compile information when using perfdata. 2122 if (UsePerfData) { 2123 update_compile_perf_data(thread, method, is_osr); 2124 } 2125 2126 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 2127 } 2128 2129 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags(); 2130 if (should_log && !directive->LogOption) { 2131 should_log = false; 2132 } 2133 2134 // Allocate a new set of JNI handles. 2135 push_jni_handle_block(); 2136 Method* target_handle = task->method(); 2137 int compilable = ciEnv::MethodCompilable; 2138 const char* failure_reason = NULL; 2139 bool failure_reason_on_C_heap = false; 2140 const char* retry_message = NULL; 2141 2142 #if INCLUDE_JVMCI 2143 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) { 2144 JVMCICompiler* jvmci = (JVMCICompiler*) comp; 2145 2146 TraceTime t1("compilation", &time); 2147 EventCompilation event; 2148 2149 // Skip redefined methods 2150 if (target_handle->is_old()) { 2151 failure_reason = "redefined method"; 2152 retry_message = "not retryable"; 2153 compilable = ciEnv::MethodCompilable_never; 2154 } else { 2155 JVMCICompileState compile_state(task); 2156 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__); 2157 methodHandle method(thread, target_handle); 2158 env.runtime()->compile_method(&env, jvmci, method, osr_bci); 2159 2160 failure_reason = compile_state.failure_reason(); 2161 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap(); 2162 if (!compile_state.retryable()) { 2163 retry_message = "not retryable"; 2164 compilable = ciEnv::MethodCompilable_not_at_tier; 2165 } 2166 if (task->code() == NULL) { 2167 assert(failure_reason != NULL, "must specify failure_reason"); 2168 } 2169 } 2170 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason); 2171 if (event.should_commit()) { 2172 post_compilation_event(event, task); 2173 } 2174 2175 } else 2176 #endif // INCLUDE_JVMCI 2177 { 2178 NoHandleMark nhm; 2179 ThreadToNativeFromVM ttn(thread); 2180 2181 ciEnv ci_env(task); 2182 if (should_break) { 2183 ci_env.set_break_at_compile(true); 2184 } 2185 if (should_log) { 2186 ci_env.set_log(thread->log()); 2187 } 2188 assert(thread->env() == &ci_env, "set by ci_env"); 2189 // The thread-env() field is cleared in ~CompileTaskWrapper. 2190 2191 // Cache Jvmti state 2192 ci_env.cache_jvmti_state(); 2193 2194 // Cache DTrace flags 2195 ci_env.cache_dtrace_flags(); 2196 2197 ciMethod* target = ci_env.get_method_from_handle(target_handle); 2198 2199 TraceTime t1("compilation", &time); 2200 EventCompilation event; 2201 2202 if (comp == NULL) { 2203 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 2204 } else { 2205 if (WhiteBoxAPI && WhiteBox::compilation_locked) { 2206 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag); 2207 while (WhiteBox::compilation_locked) { 2208 locker.wait(); 2209 } 2210 } 2211 comp->compile_method(&ci_env, target, osr_bci, directive); 2212 } 2213 2214 if (!ci_env.failing() && task->code() == NULL) { 2215 //assert(false, "compiler should always document failure"); 2216 // The compiler elected, without comment, not to register a result. 2217 // Do not attempt further compilations of this method. 2218 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 2219 } 2220 2221 // Copy this bit to the enclosing block: 2222 compilable = ci_env.compilable(); 2223 2224 if (ci_env.failing()) { 2225 failure_reason = ci_env.failure_reason(); 2226 retry_message = ci_env.retry_message(); 2227 ci_env.report_failure(failure_reason); 2228 } 2229 2230 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason); 2231 if (event.should_commit()) { 2232 post_compilation_event(event, task); 2233 } 2234 } 2235 // Remove the JNI handle block after the ciEnv destructor has run in 2236 // the previous block. 2237 pop_jni_handle_block(); 2238 2239 if (failure_reason != NULL) { 2240 task->set_failure_reason(failure_reason, failure_reason_on_C_heap); 2241 if (_compilation_log != NULL) { 2242 _compilation_log->log_failure(thread, task, failure_reason, retry_message); 2243 } 2244 if (PrintCompilation) { 2245 FormatBufferResource msg = retry_message != NULL ? 2246 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) : 2247 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason); 2248 task->print(tty, msg); 2249 } 2250 } 2251 2252 methodHandle method(thread, task->method()); 2253 2254 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2255 2256 collect_statistics(thread, time, task); 2257 2258 nmethod* nm = task->code(); 2259 if (nm != NULL) { 2260 nm->maybe_print_nmethod(directive); 2261 } 2262 DirectivesStack::release(directive); 2263 2264 if (PrintCompilation && PrintCompilation2) { 2265 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2266 tty->print("%4d ", compile_id); // print compilation number 2267 tty->print("%s ", (is_osr ? "%" : " ")); 2268 if (task->code() != NULL) { 2269 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2270 } 2271 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2272 } 2273 2274 Log(compilation, codecache) log; 2275 if (log.is_debug()) { 2276 LogStream ls(log.debug()); 2277 codecache_print(&ls, /* detailed= */ false); 2278 } 2279 if (PrintCodeCacheOnCompilation) { 2280 codecache_print(/* detailed= */ false); 2281 } 2282 // Disable compilation, if required. 2283 switch (compilable) { 2284 case ciEnv::MethodCompilable_never: 2285 if (is_osr) 2286 method->set_not_osr_compilable_quietly("MethodCompilable_never"); 2287 else 2288 method->set_not_compilable_quietly("MethodCompilable_never"); 2289 break; 2290 case ciEnv::MethodCompilable_not_at_tier: 2291 if (is_osr) 2292 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2293 else 2294 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level); 2295 break; 2296 } 2297 2298 // Note that the queued_for_compilation bits are cleared without 2299 // protection of a mutex. [They were set by the requester thread, 2300 // when adding the task to the compile queue -- at which time the 2301 // compile queue lock was held. Subsequently, we acquired the compile 2302 // queue lock to get this task off the compile queue; thus (to belabour 2303 // the point somewhat) our clearing of the bits must be occurring 2304 // only after the setting of the bits. See also 14012000 above. 2305 method->clear_queued_for_compilation(); 2306 } 2307 2308 /** 2309 * The CodeCache is full. Print warning and disable compilation. 2310 * Schedule code cache cleaning so compilation can continue later. 2311 * This function needs to be called only from CodeCache::allocate(), 2312 * since we currently handle a full code cache uniformly. 2313 */ 2314 void CompileBroker::handle_full_code_cache(int code_blob_type) { 2315 UseInterpreter = true; 2316 if (UseCompiler || AlwaysCompileLoopMethods ) { 2317 if (xtty != NULL) { 2318 ResourceMark rm; 2319 stringStream s; 2320 // Dump code cache state into a buffer before locking the tty, 2321 // because log_state() will use locks causing lock conflicts. 2322 CodeCache::log_state(&s); 2323 // Lock to prevent tearing 2324 ttyLocker ttyl; 2325 xtty->begin_elem("code_cache_full"); 2326 xtty->print("%s", s.as_string()); 2327 xtty->stamp(); 2328 xtty->end_elem(); 2329 } 2330 2331 #ifndef PRODUCT 2332 if (ExitOnFullCodeCache) { 2333 codecache_print(/* detailed= */ true); 2334 before_exit(JavaThread::current()); 2335 exit_globals(); // will delete tty 2336 vm_direct_exit(1); 2337 } 2338 #endif 2339 if (UseCodeCacheFlushing) { 2340 // Since code cache is full, immediately stop new compiles 2341 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2342 NMethodSweeper::log_sweep("disable_compiler"); 2343 } 2344 } else { 2345 disable_compilation_forever(); 2346 } 2347 2348 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning()); 2349 } 2350 } 2351 2352 // ------------------------------------------------------------------ 2353 // CompileBroker::update_compile_perf_data 2354 // 2355 // Record this compilation for debugging purposes. 2356 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) { 2357 ResourceMark rm; 2358 char* method_name = method->name()->as_C_string(); 2359 char current_method[CompilerCounters::cmname_buffer_length]; 2360 size_t maxLen = CompilerCounters::cmname_buffer_length; 2361 2362 const char* class_name = method->method_holder()->name()->as_C_string(); 2363 2364 size_t s1len = strlen(class_name); 2365 size_t s2len = strlen(method_name); 2366 2367 // check if we need to truncate the string 2368 if (s1len + s2len + 2 > maxLen) { 2369 2370 // the strategy is to lop off the leading characters of the 2371 // class name and the trailing characters of the method name. 2372 2373 if (s2len + 2 > maxLen) { 2374 // lop of the entire class name string, let snprintf handle 2375 // truncation of the method name. 2376 class_name += s1len; // null string 2377 } 2378 else { 2379 // lop off the extra characters from the front of the class name 2380 class_name += ((s1len + s2len + 2) - maxLen); 2381 } 2382 } 2383 2384 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2385 2386 int last_compile_type = normal_compile; 2387 if (CICountOSR && is_osr) { 2388 last_compile_type = osr_compile; 2389 } 2390 2391 CompilerCounters* counters = thread->counters(); 2392 counters->set_current_method(current_method); 2393 counters->set_compile_type((jlong) last_compile_type); 2394 } 2395 2396 // ------------------------------------------------------------------ 2397 // CompileBroker::push_jni_handle_block 2398 // 2399 // Push on a new block of JNI handles. 2400 void CompileBroker::push_jni_handle_block() { 2401 JavaThread* thread = JavaThread::current(); 2402 2403 // Allocate a new block for JNI handles. 2404 // Inlined code from jni_PushLocalFrame() 2405 JNIHandleBlock* java_handles = thread->active_handles(); 2406 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2407 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2408 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2409 thread->set_active_handles(compile_handles); 2410 } 2411 2412 2413 // ------------------------------------------------------------------ 2414 // CompileBroker::pop_jni_handle_block 2415 // 2416 // Pop off the current block of JNI handles. 2417 void CompileBroker::pop_jni_handle_block() { 2418 JavaThread* thread = JavaThread::current(); 2419 2420 // Release our JNI handle block 2421 JNIHandleBlock* compile_handles = thread->active_handles(); 2422 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2423 thread->set_active_handles(java_handles); 2424 compile_handles->set_pop_frame_link(NULL); 2425 JNIHandleBlock::release_block(compile_handles, thread); // may block 2426 } 2427 2428 // ------------------------------------------------------------------ 2429 // CompileBroker::collect_statistics 2430 // 2431 // Collect statistics about the compilation. 2432 2433 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2434 bool success = task->is_success(); 2435 methodHandle method (thread, task->method()); 2436 uint compile_id = task->compile_id(); 2437 bool is_osr = (task->osr_bci() != standard_entry_bci); 2438 nmethod* code = task->code(); 2439 CompilerCounters* counters = thread->counters(); 2440 2441 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2442 MutexLocker locker(CompileStatistics_lock); 2443 2444 // _perf variables are production performance counters which are 2445 // updated regardless of the setting of the CITime and CITimeEach flags 2446 // 2447 2448 // account all time, including bailouts and failures in this counter; 2449 // C1 and C2 counters are counting both successful and unsuccessful compiles 2450 _t_total_compilation.add(time); 2451 2452 if (!success) { 2453 _total_bailout_count++; 2454 if (UsePerfData) { 2455 _perf_last_failed_method->set_value(counters->current_method()); 2456 _perf_last_failed_type->set_value(counters->compile_type()); 2457 _perf_total_bailout_count->inc(); 2458 } 2459 _t_bailedout_compilation.add(time); 2460 } else if (code == NULL) { 2461 if (UsePerfData) { 2462 _perf_last_invalidated_method->set_value(counters->current_method()); 2463 _perf_last_invalidated_type->set_value(counters->compile_type()); 2464 _perf_total_invalidated_count->inc(); 2465 } 2466 _total_invalidated_count++; 2467 _t_invalidated_compilation.add(time); 2468 } else { 2469 // Compilation succeeded 2470 2471 // update compilation ticks - used by the implementation of 2472 // java.lang.management.CompilationMBean 2473 _perf_total_compilation->inc(time.ticks()); 2474 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2475 2476 if (CITime) { 2477 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes(); 2478 if (is_osr) { 2479 _t_osr_compilation.add(time); 2480 _sum_osr_bytes_compiled += bytes_compiled; 2481 } else { 2482 _t_standard_compilation.add(time); 2483 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2484 } 2485 2486 #if INCLUDE_JVMCI 2487 AbstractCompiler* comp = compiler(task->comp_level()); 2488 if (comp) { 2489 CompilerStatistics* stats = comp->stats(); 2490 if (stats) { 2491 if (is_osr) { 2492 stats->_osr.update(time, bytes_compiled); 2493 } else { 2494 stats->_standard.update(time, bytes_compiled); 2495 } 2496 stats->_nmethods_size += code->total_size(); 2497 stats->_nmethods_code_size += code->insts_size(); 2498 } else { // if (!stats) 2499 assert(false, "Compiler statistics object must exist"); 2500 } 2501 } else { // if (!comp) 2502 assert(false, "Compiler object must exist"); 2503 } 2504 #endif // INCLUDE_JVMCI 2505 } 2506 2507 if (UsePerfData) { 2508 // save the name of the last method compiled 2509 _perf_last_method->set_value(counters->current_method()); 2510 _perf_last_compile_type->set_value(counters->compile_type()); 2511 _perf_last_compile_size->set_value(method->code_size() + 2512 task->num_inlined_bytecodes()); 2513 if (is_osr) { 2514 _perf_osr_compilation->inc(time.ticks()); 2515 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2516 } else { 2517 _perf_standard_compilation->inc(time.ticks()); 2518 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2519 } 2520 } 2521 2522 if (CITimeEach) { 2523 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2524 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2525 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2526 } 2527 2528 // Collect counts of successful compilations 2529 _sum_nmethod_size += code->total_size(); 2530 _sum_nmethod_code_size += code->insts_size(); 2531 _total_compile_count++; 2532 2533 if (UsePerfData) { 2534 _perf_sum_nmethod_size->inc( code->total_size()); 2535 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2536 _perf_total_compile_count->inc(); 2537 } 2538 2539 if (is_osr) { 2540 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2541 _total_osr_compile_count++; 2542 } else { 2543 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2544 _total_standard_compile_count++; 2545 } 2546 } 2547 // set the current method for the thread to null 2548 if (UsePerfData) counters->set_current_method(""); 2549 } 2550 2551 const char* CompileBroker::compiler_name(int comp_level) { 2552 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2553 if (comp == NULL) { 2554 return "no compiler"; 2555 } else { 2556 return (comp->name()); 2557 } 2558 } 2559 2560 #if INCLUDE_JVMCI 2561 void CompileBroker::print_times(AbstractCompiler* comp) { 2562 CompilerStatistics* stats = comp->stats(); 2563 if (stats) { 2564 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}", 2565 comp->name(), stats->bytes_per_second(), 2566 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count, 2567 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count, 2568 stats->_nmethods_size, stats->_nmethods_code_size); 2569 } else { // if (!stats) 2570 assert(false, "Compiler statistics object must exist"); 2571 } 2572 comp->print_timers(); 2573 } 2574 #endif // INCLUDE_JVMCI 2575 2576 void CompileBroker::print_times(bool per_compiler, bool aggregate) { 2577 #if INCLUDE_JVMCI 2578 elapsedTimer standard_compilation; 2579 elapsedTimer total_compilation; 2580 elapsedTimer osr_compilation; 2581 2582 int standard_bytes_compiled = 0; 2583 int osr_bytes_compiled = 0; 2584 2585 int standard_compile_count = 0; 2586 int osr_compile_count = 0; 2587 int total_compile_count = 0; 2588 2589 int nmethods_size = 0; 2590 int nmethods_code_size = 0; 2591 bool printedHeader = false; 2592 2593 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) { 2594 AbstractCompiler* comp = _compilers[i]; 2595 if (comp != NULL) { 2596 if (per_compiler && aggregate && !printedHeader) { 2597 printedHeader = true; 2598 tty->cr(); 2599 tty->print_cr("Individual compiler times (for compiled methods only)"); 2600 tty->print_cr("------------------------------------------------"); 2601 tty->cr(); 2602 } 2603 CompilerStatistics* stats = comp->stats(); 2604 2605 if (stats) { 2606 standard_compilation.add(stats->_standard._time); 2607 osr_compilation.add(stats->_osr._time); 2608 2609 standard_bytes_compiled += stats->_standard._bytes; 2610 osr_bytes_compiled += stats->_osr._bytes; 2611 2612 standard_compile_count += stats->_standard._count; 2613 osr_compile_count += stats->_osr._count; 2614 2615 nmethods_size += stats->_nmethods_size; 2616 nmethods_code_size += stats->_nmethods_code_size; 2617 } else { // if (!stats) 2618 assert(false, "Compiler statistics object must exist"); 2619 } 2620 2621 if (per_compiler) { 2622 print_times(comp); 2623 } 2624 } 2625 } 2626 total_compile_count = osr_compile_count + standard_compile_count; 2627 total_compilation.add(osr_compilation); 2628 total_compilation.add(standard_compilation); 2629 2630 // In hosted mode, print the JVMCI compiler specific counters manually. 2631 if (!UseJVMCICompiler) { 2632 JVMCICompiler::print_compilation_timers(); 2633 } 2634 #else // INCLUDE_JVMCI 2635 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation; 2636 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation; 2637 elapsedTimer total_compilation = CompileBroker::_t_total_compilation; 2638 2639 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled; 2640 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled; 2641 2642 int standard_compile_count = CompileBroker::_total_standard_compile_count; 2643 int osr_compile_count = CompileBroker::_total_osr_compile_count; 2644 int total_compile_count = CompileBroker::_total_compile_count; 2645 2646 int nmethods_size = CompileBroker::_sum_nmethod_code_size; 2647 int nmethods_code_size = CompileBroker::_sum_nmethod_size; 2648 #endif // INCLUDE_JVMCI 2649 2650 if (!aggregate) { 2651 return; 2652 } 2653 tty->cr(); 2654 tty->print_cr("Accumulated compiler times"); 2655 tty->print_cr("----------------------------------------------------------"); 2656 //0000000000111111111122222222223333333333444444444455555555556666666666 2657 //0123456789012345678901234567890123456789012345678901234567890123456789 2658 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds()); 2659 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s", 2660 standard_compilation.seconds(), 2661 standard_compilation.seconds() / standard_compile_count); 2662 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s", 2663 CompileBroker::_t_bailedout_compilation.seconds(), 2664 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count); 2665 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s", 2666 osr_compilation.seconds(), 2667 osr_compilation.seconds() / osr_compile_count); 2668 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s", 2669 CompileBroker::_t_invalidated_compilation.seconds(), 2670 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count); 2671 2672 AbstractCompiler *comp = compiler(CompLevel_simple); 2673 if (comp != NULL) { 2674 tty->cr(); 2675 comp->print_timers(); 2676 } 2677 comp = compiler(CompLevel_full_optimization); 2678 if (comp != NULL) { 2679 tty->cr(); 2680 comp->print_timers(); 2681 } 2682 tty->cr(); 2683 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count); 2684 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count); 2685 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count); 2686 int tcb = osr_bytes_compiled + standard_bytes_compiled; 2687 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb); 2688 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled); 2689 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled); 2690 double tcs = total_compilation.seconds(); 2691 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs); 2692 tty->print_cr(" Average compilation speed : %8d bytes/s", bps); 2693 tty->cr(); 2694 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size); 2695 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size); 2696 } 2697 2698 // Print general/accumulated JIT information. 2699 void CompileBroker::print_info(outputStream *out) { 2700 if (out == NULL) out = tty; 2701 out->cr(); 2702 out->print_cr("======================"); 2703 out->print_cr(" General JIT info "); 2704 out->print_cr("======================"); 2705 out->cr(); 2706 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off"); 2707 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount); 2708 out->cr(); 2709 out->print_cr("CodeCache overview"); 2710 out->print_cr("--------------------------------------------------------"); 2711 out->cr(); 2712 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K); 2713 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K); 2714 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K); 2715 out->cr(); 2716 2717 out->cr(); 2718 out->print_cr("CodeCache cleaning overview"); 2719 out->print_cr("--------------------------------------------------------"); 2720 out->cr(); 2721 NMethodSweeper::print(out); 2722 out->print_cr("--------------------------------------------------------"); 2723 out->cr(); 2724 } 2725 2726 // Note: tty_lock must not be held upon entry to this function. 2727 // Print functions called from herein do "micro-locking" on tty_lock. 2728 // That's a tradeoff which keeps together important blocks of output. 2729 // At the same time, continuous tty_lock hold time is kept in check, 2730 // preventing concurrently printing threads from stalling a long time. 2731 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) { 2732 TimeStamp ts_total; 2733 TimeStamp ts_global; 2734 TimeStamp ts; 2735 2736 bool allFun = !strcmp(function, "all"); 2737 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun; 2738 bool usedSpace = !strcmp(function, "UsedSpace") || allFun; 2739 bool freeSpace = !strcmp(function, "FreeSpace") || allFun; 2740 bool methodCount = !strcmp(function, "MethodCount") || allFun; 2741 bool methodSpace = !strcmp(function, "MethodSpace") || allFun; 2742 bool methodAge = !strcmp(function, "MethodAge") || allFun; 2743 bool methodNames = !strcmp(function, "MethodNames") || allFun; 2744 bool discard = !strcmp(function, "discard") || allFun; 2745 2746 if (out == NULL) { 2747 out = tty; 2748 } 2749 2750 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) { 2751 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function); 2752 out->cr(); 2753 return; 2754 } 2755 2756 ts_total.update(); // record starting point 2757 2758 if (aggregate) { 2759 print_info(out); 2760 } 2761 2762 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function. 2763 // That prevents another thread from destroying our view on the CodeHeap. 2764 // When we request individual parts of the analysis via the jcmd interface, it is possible 2765 // that in between another thread (another jcmd user or the vm running into CodeCache OOM) 2766 // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock 2767 // across user interaction. 2768 // Acquire this lock before acquiring the CodeCache_lock. 2769 // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time, 2770 // leading to an unnecessarily long hold time of the CodeCache_lock. 2771 ts.update(); // record starting point 2772 MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag); 2773 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds()); 2774 2775 // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock 2776 // for the entire duration of aggregation and printing. That makes sure 2777 // we see a consistent picture and do not run into issues caused by 2778 // the CodeHeap being altered concurrently. 2779 Mutex* global_lock = allFun ? CodeCache_lock : NULL; 2780 Mutex* function_lock = allFun ? NULL : CodeCache_lock; 2781 ts_global.update(); // record starting point 2782 MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag); 2783 if (global_lock != NULL) { 2784 out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds()); 2785 ts_global.update(); // record starting point 2786 } 2787 2788 if (aggregate) { 2789 ts.update(); // record starting point 2790 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag); 2791 if (function_lock != NULL) { 2792 out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds()); 2793 } 2794 2795 ts.update(); // record starting point 2796 CodeCache::aggregate(out, granularity); 2797 if (function_lock != NULL) { 2798 out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds()); 2799 } 2800 } 2801 2802 if (usedSpace) CodeCache::print_usedSpace(out); 2803 if (freeSpace) CodeCache::print_freeSpace(out); 2804 if (methodCount) CodeCache::print_count(out); 2805 if (methodSpace) CodeCache::print_space(out); 2806 if (methodAge) CodeCache::print_age(out); 2807 if (methodNames) { 2808 // print_names() has shown to be sensitive to concurrent CodeHeap modifications. 2809 // Therefore, request the CodeCache_lock before calling... 2810 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag); 2811 CodeCache::print_names(out); 2812 } 2813 if (discard) CodeCache::discard(out); 2814 2815 if (global_lock != NULL) { 2816 out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds()); 2817 } 2818 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds()); 2819 }