1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "code/codeCache.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "compiler/compileLog.hpp" 31 #include "compiler/compilerOracle.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/allocation.inline.hpp" 34 #include "oops/methodData.hpp" 35 #include "oops/method.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/nativeLookup.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/atomic.inline.hpp" 40 #include "runtime/compilationPolicy.hpp" 41 #include "runtime/init.hpp" 42 #include "runtime/interfaceSupport.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/os.hpp" 45 #include "runtime/sharedRuntime.hpp" 46 #include "runtime/sweeper.hpp" 47 #include "trace/tracing.hpp" 48 #include "utilities/dtrace.hpp" 49 #include "utilities/events.hpp" 50 #ifdef COMPILER1 51 #include "c1/c1_Compiler.hpp" 52 #endif 53 #ifdef COMPILER2 54 #include "opto/c2compiler.hpp" 55 #endif 56 #ifdef SHARK 57 #include "shark/sharkCompiler.hpp" 58 #endif 59 60 #ifdef DTRACE_ENABLED 61 62 // Only bother with this argument setup if dtrace is available 63 64 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 65 { \ 66 Symbol* klass_name = (method)->klass_name(); \ 67 Symbol* name = (method)->name(); \ 68 Symbol* signature = (method)->signature(); \ 69 HOTSPOT_METHOD_COMPILE_BEGIN( \ 70 (char *) comp_name, strlen(comp_name), \ 71 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 72 (char *) name->bytes(), name->utf8_length(), \ 73 (char *) signature->bytes(), signature->utf8_length()); \ 74 } 75 76 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 77 { \ 78 Symbol* klass_name = (method)->klass_name(); \ 79 Symbol* name = (method)->name(); \ 80 Symbol* signature = (method)->signature(); \ 81 HOTSPOT_METHOD_COMPILE_END( \ 82 (char *) comp_name, strlen(comp_name), \ 83 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 84 (char *) name->bytes(), name->utf8_length(), \ 85 (char *) signature->bytes(), signature->utf8_length(), (success)); \ 86 } 87 88 #else // ndef DTRACE_ENABLED 89 90 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 91 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 92 93 #endif // ndef DTRACE_ENABLED 94 95 bool CompileBroker::_initialized = false; 96 volatile bool CompileBroker::_should_block = false; 97 volatile jint CompileBroker::_print_compilation_warning = 0; 98 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 99 100 // The installed compiler(s) 101 AbstractCompiler* CompileBroker::_compilers[2]; 102 103 // These counters are used to assign an unique ID to each compilation. 104 volatile jint CompileBroker::_compilation_id = 0; 105 volatile jint CompileBroker::_osr_compilation_id = 0; 106 107 // Debugging information 108 int CompileBroker::_last_compile_type = no_compile; 109 int CompileBroker::_last_compile_level = CompLevel_none; 110 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 111 112 // Performance counters 113 PerfCounter* CompileBroker::_perf_total_compilation = NULL; 114 PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 115 PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 116 117 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 118 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 119 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 120 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 121 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 122 123 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 124 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 125 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 126 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 127 128 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 129 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 130 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 131 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 132 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 133 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 134 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 135 136 // Timers and counters for generating statistics 137 elapsedTimer CompileBroker::_t_total_compilation; 138 elapsedTimer CompileBroker::_t_osr_compilation; 139 elapsedTimer CompileBroker::_t_standard_compilation; 140 elapsedTimer CompileBroker::_t_invalidated_compilation; 141 elapsedTimer CompileBroker::_t_bailedout_compilation; 142 143 int CompileBroker::_total_bailout_count = 0; 144 int CompileBroker::_total_invalidated_count = 0; 145 int CompileBroker::_total_compile_count = 0; 146 int CompileBroker::_total_osr_compile_count = 0; 147 int CompileBroker::_total_standard_compile_count = 0; 148 149 int CompileBroker::_sum_osr_bytes_compiled = 0; 150 int CompileBroker::_sum_standard_bytes_compiled = 0; 151 int CompileBroker::_sum_nmethod_size = 0; 152 int CompileBroker::_sum_nmethod_code_size = 0; 153 154 long CompileBroker::_peak_compilation_time = 0; 155 156 CompileQueue* CompileBroker::_c2_compile_queue = NULL; 157 CompileQueue* CompileBroker::_c1_compile_queue = NULL; 158 159 160 class CompilationLog : public StringEventLog { 161 public: 162 CompilationLog() : StringEventLog("Compilation events") { 163 } 164 165 void log_compile(JavaThread* thread, CompileTask* task) { 166 StringLogMessage lm; 167 stringStream sstr = lm.stream(); 168 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 169 task->print_compilation(&sstr, NULL, true, false); 170 log(thread, "%s", (const char*)lm); 171 } 172 173 void log_nmethod(JavaThread* thread, nmethod* nm) { 174 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]", 175 nm->compile_id(), nm->is_osr_method() ? "%" : "", 176 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end())); 177 } 178 179 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 180 StringLogMessage lm; 181 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 182 if (retry_message != NULL) { 183 lm.append(" (%s)", retry_message); 184 } 185 lm.print("\n"); 186 log(thread, "%s", (const char*)lm); 187 } 188 }; 189 190 static CompilationLog* _compilation_log = NULL; 191 192 void compileBroker_init() { 193 if (LogEvents) { 194 _compilation_log = new CompilationLog(); 195 } 196 } 197 198 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 199 CompilerThread* thread = CompilerThread::current(); 200 thread->set_task(task); 201 CompileLog* log = thread->log(); 202 if (log != NULL) task->log_task_start(log); 203 } 204 205 CompileTaskWrapper::~CompileTaskWrapper() { 206 CompilerThread* thread = CompilerThread::current(); 207 CompileTask* task = thread->task(); 208 CompileLog* log = thread->log(); 209 if (log != NULL) task->log_task_done(log); 210 thread->set_task(NULL); 211 task->set_code_handle(NULL); 212 thread->set_env(NULL); 213 if (task->is_blocking()) { 214 MutexLocker notifier(task->lock(), thread); 215 task->mark_complete(); 216 // Notify the waiting thread that the compilation has completed. 217 task->lock()->notify_all(); 218 } else { 219 task->mark_complete(); 220 221 // By convention, the compiling thread is responsible for 222 // recycling a non-blocking CompileTask. 223 CompileTask::free(task); 224 } 225 } 226 227 228 CompileTask* CompileTask::_task_free_list = NULL; 229 #ifdef ASSERT 230 int CompileTask::_num_allocated_tasks = 0; 231 #endif 232 /** 233 * Allocate a CompileTask, from the free list if possible. 234 */ 235 CompileTask* CompileTask::allocate() { 236 MutexLocker locker(CompileTaskAlloc_lock); 237 CompileTask* task = NULL; 238 239 if (_task_free_list != NULL) { 240 task = _task_free_list; 241 _task_free_list = task->next(); 242 task->set_next(NULL); 243 } else { 244 task = new CompileTask(); 245 DEBUG_ONLY(_num_allocated_tasks++;) 246 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?"); 247 task->set_next(NULL); 248 task->set_is_free(true); 249 } 250 assert(task->is_free(), "Task must be free."); 251 task->set_is_free(false); 252 return task; 253 } 254 255 256 /** 257 * Add a task to the free list. 258 */ 259 void CompileTask::free(CompileTask* task) { 260 MutexLocker locker(CompileTaskAlloc_lock); 261 if (!task->is_free()) { 262 task->set_code(NULL); 263 assert(!task->lock()->is_locked(), "Should not be locked when freed"); 264 JNIHandles::destroy_global(task->_method_holder); 265 JNIHandles::destroy_global(task->_hot_method_holder); 266 267 task->set_is_free(true); 268 task->set_next(_task_free_list); 269 _task_free_list = task; 270 } 271 } 272 273 void CompileTask::initialize(int compile_id, 274 methodHandle method, 275 int osr_bci, 276 int comp_level, 277 methodHandle hot_method, 278 int hot_count, 279 const char* comment, 280 bool is_blocking) { 281 assert(!_lock->is_locked(), "bad locking"); 282 283 _compile_id = compile_id; 284 _method = method(); 285 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 286 _osr_bci = osr_bci; 287 _is_blocking = is_blocking; 288 _comp_level = comp_level; 289 _num_inlined_bytecodes = 0; 290 291 _is_complete = false; 292 _is_success = false; 293 _code_handle = NULL; 294 295 _hot_method = NULL; 296 _hot_method_holder = NULL; 297 _hot_count = hot_count; 298 _time_queued = 0; // tidy 299 _comment = comment; 300 _failure_reason = NULL; 301 302 if (LogCompilation) { 303 _time_queued = os::elapsed_counter(); 304 if (hot_method.not_null()) { 305 if (hot_method == method) { 306 _hot_method = _method; 307 } else { 308 _hot_method = hot_method(); 309 // only add loader or mirror if different from _method_holder 310 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 311 } 312 } 313 } 314 315 _next = NULL; 316 } 317 318 // ------------------------------------------------------------------ 319 // CompileTask::code/set_code 320 nmethod* CompileTask::code() const { 321 if (_code_handle == NULL) return NULL; 322 return _code_handle->code(); 323 } 324 void CompileTask::set_code(nmethod* nm) { 325 if (_code_handle == NULL && nm == NULL) return; 326 guarantee(_code_handle != NULL, ""); 327 _code_handle->set_code(nm); 328 if (nm == NULL) _code_handle = NULL; // drop the handle also 329 } 330 331 void CompileTask::mark_on_stack() { 332 // Mark these methods as something redefine classes cannot remove. 333 _method->set_on_stack(true); 334 if (_hot_method != NULL) { 335 _hot_method->set_on_stack(true); 336 } 337 } 338 339 // ------------------------------------------------------------------ 340 // CompileTask::print_line_on_error 341 // 342 // This function is called by fatal error handler when the thread 343 // causing troubles is a compiler thread. 344 // 345 // Do not grab any lock, do not allocate memory. 346 // 347 // Otherwise it's the same as CompileTask::print_line() 348 // 349 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 350 // print compiler name 351 st->print("%s:", CompileBroker::compiler_name(comp_level())); 352 print_compilation(st); 353 } 354 355 // ------------------------------------------------------------------ 356 // CompileTask::print_line 357 void CompileTask::print_tty() { 358 ttyLocker ttyl; // keep the following output all in one block 359 // print compiler name if requested 360 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 361 print_compilation(tty); 362 } 363 364 // ------------------------------------------------------------------ 365 // CompileTask::print_compilation_impl 366 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 367 bool is_osr_method, int osr_bci, bool is_blocking, 368 const char* msg, bool short_form, bool cr) { 369 if (!short_form) { 370 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 371 } 372 st->print("%4d ", compile_id); // print compilation number 373 374 // For unloaded methods the transition to zombie occurs after the 375 // method is cleared so it's impossible to report accurate 376 // information for that case. 377 bool is_synchronized = false; 378 bool has_exception_handler = false; 379 bool is_native = false; 380 if (method != NULL) { 381 is_synchronized = method->is_synchronized(); 382 has_exception_handler = method->has_exception_handler(); 383 is_native = method->is_native(); 384 } 385 // method attributes 386 const char compile_type = is_osr_method ? '%' : ' '; 387 const char sync_char = is_synchronized ? 's' : ' '; 388 const char exception_char = has_exception_handler ? '!' : ' '; 389 const char blocking_char = is_blocking ? 'b' : ' '; 390 const char native_char = is_native ? 'n' : ' '; 391 392 // print method attributes 393 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 394 395 if (TieredCompilation) { 396 if (comp_level != -1) st->print("%d ", comp_level); 397 else st->print("- "); 398 } 399 st->print(" "); // more indent 400 401 if (method == NULL) { 402 st->print("(method)"); 403 } else { 404 method->print_short_name(st); 405 if (is_osr_method) { 406 st->print(" @ %d", osr_bci); 407 } 408 if (method->is_native()) 409 st->print(" (native)"); 410 else 411 st->print(" (%d bytes)", method->code_size()); 412 } 413 414 if (msg != NULL) { 415 st->print(" %s", msg); 416 } 417 if (cr) { 418 st->cr(); 419 } 420 } 421 422 // ------------------------------------------------------------------ 423 // CompileTask::print_inlining 424 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 425 // 1234567 426 st->print(" "); // print timestamp 427 // 1234 428 st->print(" "); // print compilation number 429 430 // method attributes 431 if (method->is_loaded()) { 432 const char sync_char = method->is_synchronized() ? 's' : ' '; 433 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 434 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 435 436 // print method attributes 437 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 438 } else { 439 // %s!bn 440 st->print(" "); // print method attributes 441 } 442 443 if (TieredCompilation) { 444 st->print(" "); 445 } 446 st->print(" "); // more indent 447 st->print(" "); // initial inlining indent 448 449 for (int i = 0; i < inline_level; i++) st->print(" "); 450 451 st->print("@ %d ", bci); // print bci 452 method->print_short_name(st); 453 if (method->is_loaded()) 454 st->print(" (%d bytes)", method->code_size()); 455 else 456 st->print(" (not loaded)"); 457 458 if (msg != NULL) { 459 st->print(" %s", msg); 460 } 461 st->cr(); 462 } 463 464 // ------------------------------------------------------------------ 465 // CompileTask::print_inline_indent 466 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 467 // 1234567 468 st->print(" "); // print timestamp 469 // 1234 470 st->print(" "); // print compilation number 471 // %s!bn 472 st->print(" "); // print method attributes 473 if (TieredCompilation) { 474 st->print(" "); 475 } 476 st->print(" "); // more indent 477 st->print(" "); // initial inlining indent 478 for (int i = 0; i < inline_level; i++) st->print(" "); 479 } 480 481 // ------------------------------------------------------------------ 482 // CompileTask::print_compilation 483 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) { 484 bool is_osr_method = osr_bci() != InvocationEntryBci; 485 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr); 486 } 487 488 // ------------------------------------------------------------------ 489 // CompileTask::log_task 490 void CompileTask::log_task(xmlStream* log) { 491 Thread* thread = Thread::current(); 492 methodHandle method(thread, this->method()); 493 ResourceMark rm(thread); 494 495 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 496 log->print(" compile_id='%d'", _compile_id); 497 if (_osr_bci != CompileBroker::standard_entry_bci) { 498 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 499 } // else compile_kind='c2c' 500 if (!method.is_null()) log->method(method); 501 if (_osr_bci != CompileBroker::standard_entry_bci) { 502 log->print(" osr_bci='%d'", _osr_bci); 503 } 504 if (_comp_level != CompLevel_highest_tier) { 505 log->print(" level='%d'", _comp_level); 506 } 507 if (_is_blocking) { 508 log->print(" blocking='1'"); 509 } 510 log->stamp(); 511 } 512 513 514 // ------------------------------------------------------------------ 515 // CompileTask::log_task_queued 516 void CompileTask::log_task_queued() { 517 Thread* thread = Thread::current(); 518 ttyLocker ttyl; 519 ResourceMark rm(thread); 520 521 xtty->begin_elem("task_queued"); 522 log_task(xtty); 523 if (_comment != NULL) { 524 xtty->print(" comment='%s'", _comment); 525 } 526 if (_hot_method != NULL) { 527 methodHandle hot(thread, _hot_method); 528 methodHandle method(thread, _method); 529 if (hot() != method()) { 530 xtty->method(hot); 531 } 532 } 533 if (_hot_count != 0) { 534 xtty->print(" hot_count='%d'", _hot_count); 535 } 536 xtty->end_elem(); 537 } 538 539 540 // ------------------------------------------------------------------ 541 // CompileTask::log_task_start 542 void CompileTask::log_task_start(CompileLog* log) { 543 log->begin_head("task"); 544 log_task(log); 545 log->end_head(); 546 } 547 548 549 // ------------------------------------------------------------------ 550 // CompileTask::log_task_done 551 void CompileTask::log_task_done(CompileLog* log) { 552 Thread* thread = Thread::current(); 553 methodHandle method(thread, this->method()); 554 ResourceMark rm(thread); 555 556 if (!_is_success) { 557 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown"; 558 log->elem("failure reason='%s'", reason); 559 } 560 561 // <task_done ... stamp='1.234'> </task> 562 nmethod* nm = code(); 563 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 564 _is_success, nm == NULL ? 0 : nm->content_size(), 565 method->invocation_count()); 566 int bec = method->backedge_count(); 567 if (bec != 0) log->print(" backedge_count='%d'", bec); 568 // Note: "_is_complete" is about to be set, but is not. 569 if (_num_inlined_bytecodes != 0) { 570 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 571 } 572 log->stamp(); 573 log->end_elem(); 574 log->tail("task"); 575 log->clear_identities(); // next task will have different CI 576 if (log->unflushed_count() > 2000) { 577 log->flush(); 578 } 579 log->mark_file_end(); 580 } 581 582 583 584 /** 585 * Add a CompileTask to a CompileQueue. 586 */ 587 void CompileQueue::add(CompileTask* task) { 588 assert(lock()->owned_by_self(), "must own lock"); 589 590 task->set_next(NULL); 591 task->set_prev(NULL); 592 593 if (_last == NULL) { 594 // The compile queue is empty. 595 assert(_first == NULL, "queue is empty"); 596 _first = task; 597 _last = task; 598 } else { 599 // Append the task to the queue. 600 assert(_last->next() == NULL, "not last"); 601 _last->set_next(task); 602 task->set_prev(_last); 603 _last = task; 604 } 605 ++_size; 606 607 // Mark the method as being in the compile queue. 608 task->method()->set_queued_for_compilation(); 609 610 if (CIPrintCompileQueue) { 611 print_tty(); 612 } 613 614 if (LogCompilation && xtty != NULL) { 615 task->log_task_queued(); 616 } 617 618 // Notify CompilerThreads that a task is available. 619 lock()->notify_all(); 620 } 621 622 /** 623 * Empties compilation queue by putting all compilation tasks onto 624 * a freelist. Furthermore, the method wakes up all threads that are 625 * waiting on a compilation task to finish. This can happen if background 626 * compilation is disabled. 627 */ 628 void CompileQueue::free_all() { 629 MutexLocker mu(lock()); 630 CompileTask* next = _first; 631 632 // Iterate over all tasks in the compile queue 633 while (next != NULL) { 634 CompileTask* current = next; 635 next = current->next(); 636 { 637 // Wake up thread that blocks on the compile task. 638 MutexLocker ct_lock(current->lock()); 639 current->lock()->notify(); 640 } 641 // Put the task back on the freelist. 642 CompileTask::free(current); 643 } 644 _first = NULL; 645 646 // Wake up all threads that block on the queue. 647 lock()->notify_all(); 648 } 649 650 /** 651 * Get the next CompileTask from a CompileQueue 652 */ 653 CompileTask* CompileQueue::get() { 654 MutexLocker locker(lock()); 655 // If _first is NULL we have no more compile jobs. There are two reasons for 656 // having no compile jobs: First, we compiled everything we wanted. Second, 657 // we ran out of code cache so compilation has been disabled. In the latter 658 // case we perform code cache sweeps to free memory such that we can re-enable 659 // compilation. 660 while (_first == NULL) { 661 // Exit loop if compilation is disabled forever 662 if (CompileBroker::is_compilation_disabled_forever()) { 663 return NULL; 664 } 665 666 // If there are no compilation tasks and we can compile new jobs 667 // (i.e., there is enough free space in the code cache) there is 668 // no need to invoke the sweeper. As a result, the hotness of methods 669 // remains unchanged. This behavior is desired, since we want to keep 670 // the stable state, i.e., we do not want to evict methods from the 671 // code cache if it is unnecessary. 672 // We need a timed wait here, since compiler threads can exit if compilation 673 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 674 // is not critical and we do not want idle compiler threads to wake up too often. 675 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 676 } 677 678 if (CompileBroker::is_compilation_disabled_forever()) { 679 return NULL; 680 } 681 682 CompileTask* task; 683 { 684 No_Safepoint_Verifier nsv; 685 task = CompilationPolicy::policy()->select_task(this); 686 } 687 remove(task); 688 purge_stale_tasks(); // may temporarily release MCQ lock 689 return task; 690 } 691 692 // Clean & deallocate stale compile tasks. 693 // Temporarily releases MethodCompileQueue lock. 694 void CompileQueue::purge_stale_tasks() { 695 assert(lock()->owned_by_self(), "must own lock"); 696 if (_first_stale != NULL) { 697 // Stale tasks are purged when MCQ lock is released, 698 // but _first_stale updates are protected by MCQ lock. 699 // Once task processing starts and MCQ lock is released, 700 // other compiler threads can reuse _first_stale. 701 CompileTask* head = _first_stale; 702 _first_stale = NULL; 703 { 704 MutexUnlocker ul(lock()); 705 for (CompileTask* task = head; task != NULL; ) { 706 CompileTask* next_task = task->next(); 707 CompileTaskWrapper ctw(task); // Frees the task 708 task->set_failure_reason("stale task"); 709 task = next_task; 710 } 711 } 712 } 713 } 714 715 void CompileQueue::remove(CompileTask* task) { 716 assert(lock()->owned_by_self(), "must own lock"); 717 if (task->prev() != NULL) { 718 task->prev()->set_next(task->next()); 719 } else { 720 // max is the first element 721 assert(task == _first, "Sanity"); 722 _first = task->next(); 723 } 724 725 if (task->next() != NULL) { 726 task->next()->set_prev(task->prev()); 727 } else { 728 // max is the last element 729 assert(task == _last, "Sanity"); 730 _last = task->prev(); 731 } 732 --_size; 733 } 734 735 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 736 assert(lock()->owned_by_self(), "must own lock"); 737 remove(task); 738 739 // Enqueue the task for reclamation (should be done outside MCQ lock) 740 task->set_next(_first_stale); 741 task->set_prev(NULL); 742 _first_stale = task; 743 } 744 745 // methods in the compile queue need to be marked as used on the stack 746 // so that they don't get reclaimed by Redefine Classes 747 void CompileQueue::mark_on_stack() { 748 CompileTask* task = _first; 749 while (task != NULL) { 750 task->mark_on_stack(); 751 task = task->next(); 752 } 753 } 754 755 756 CompileQueue* CompileBroker::compile_queue(int comp_level) { 757 if (is_c2_compile(comp_level)) return _c2_compile_queue; 758 if (is_c1_compile(comp_level)) return _c1_compile_queue; 759 return NULL; 760 } 761 762 763 void CompileBroker::print_compile_queues(outputStream* st) { 764 MutexLocker locker(MethodCompileQueue_lock); 765 if (_c1_compile_queue != NULL) { 766 _c1_compile_queue->print(st); 767 } 768 if (_c2_compile_queue != NULL) { 769 _c2_compile_queue->print(st); 770 } 771 } 772 773 void CompileQueue::print(outputStream* st) { 774 assert(lock()->owned_by_self(), "must own lock"); 775 st->print_cr("Contents of %s", name()); 776 st->print_cr("----------------------------"); 777 CompileTask* task = _first; 778 if (task == NULL) { 779 st->print_cr("Empty"); 780 } else { 781 while (task != NULL) { 782 task->print_compilation(st, NULL, true, true); 783 task = task->next(); 784 } 785 } 786 st->print_cr("----------------------------"); 787 } 788 789 void CompileQueue::print_tty() { 790 ttyLocker ttyl; 791 print(tty); 792 } 793 794 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 795 796 _current_method[0] = '\0'; 797 _compile_type = CompileBroker::no_compile; 798 799 if (UsePerfData) { 800 ResourceMark rm; 801 802 // create the thread instance name space string - don't create an 803 // instance subspace if instance is -1 - keeps the adapterThread 804 // counters from having a ".0" namespace. 805 const char* thread_i = (instance == -1) ? thread_name : 806 PerfDataManager::name_space(thread_name, instance); 807 808 809 char* name = PerfDataManager::counter_name(thread_i, "method"); 810 _perf_current_method = 811 PerfDataManager::create_string_variable(SUN_CI, name, 812 cmname_buffer_length, 813 _current_method, CHECK); 814 815 name = PerfDataManager::counter_name(thread_i, "type"); 816 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 817 PerfData::U_None, 818 (jlong)_compile_type, 819 CHECK); 820 821 name = PerfDataManager::counter_name(thread_i, "time"); 822 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 823 PerfData::U_Ticks, CHECK); 824 825 name = PerfDataManager::counter_name(thread_i, "compiles"); 826 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 827 PerfData::U_Events, CHECK); 828 } 829 } 830 831 // ------------------------------------------------------------------ 832 // CompileBroker::compilation_init 833 // 834 // Initialize the Compilation object 835 void CompileBroker::compilation_init() { 836 _last_method_compiled[0] = '\0'; 837 838 // No need to initialize compilation system if we do not use it. 839 if (!UseCompiler) { 840 return; 841 } 842 #ifndef SHARK 843 // Set the interface to the current compiler(s). 844 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 845 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 846 #ifdef COMPILER1 847 if (c1_count > 0) { 848 _compilers[0] = new Compiler(); 849 } 850 #endif // COMPILER1 851 852 #ifdef COMPILER2 853 if (c2_count > 0) { 854 _compilers[1] = new C2Compiler(); 855 } 856 #endif // COMPILER2 857 858 #else // SHARK 859 int c1_count = 0; 860 int c2_count = 1; 861 862 _compilers[1] = new SharkCompiler(); 863 #endif // SHARK 864 865 // Start the compiler thread(s) and the sweeper thread 866 init_compiler_sweeper_threads(c1_count, c2_count); 867 // totalTime performance counter is always created as it is required 868 // by the implementation of java.lang.management.CompilationMBean. 869 { 870 EXCEPTION_MARK; 871 _perf_total_compilation = 872 PerfDataManager::create_counter(JAVA_CI, "totalTime", 873 PerfData::U_Ticks, CHECK); 874 } 875 876 877 if (UsePerfData) { 878 879 EXCEPTION_MARK; 880 881 // create the jvmstat performance counters 882 _perf_osr_compilation = 883 PerfDataManager::create_counter(SUN_CI, "osrTime", 884 PerfData::U_Ticks, CHECK); 885 886 _perf_standard_compilation = 887 PerfDataManager::create_counter(SUN_CI, "standardTime", 888 PerfData::U_Ticks, CHECK); 889 890 _perf_total_bailout_count = 891 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 892 PerfData::U_Events, CHECK); 893 894 _perf_total_invalidated_count = 895 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 896 PerfData::U_Events, CHECK); 897 898 _perf_total_compile_count = 899 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 900 PerfData::U_Events, CHECK); 901 _perf_total_osr_compile_count = 902 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 903 PerfData::U_Events, CHECK); 904 905 _perf_total_standard_compile_count = 906 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 907 PerfData::U_Events, CHECK); 908 909 _perf_sum_osr_bytes_compiled = 910 PerfDataManager::create_counter(SUN_CI, "osrBytes", 911 PerfData::U_Bytes, CHECK); 912 913 _perf_sum_standard_bytes_compiled = 914 PerfDataManager::create_counter(SUN_CI, "standardBytes", 915 PerfData::U_Bytes, CHECK); 916 917 _perf_sum_nmethod_size = 918 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 919 PerfData::U_Bytes, CHECK); 920 921 _perf_sum_nmethod_code_size = 922 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 923 PerfData::U_Bytes, CHECK); 924 925 _perf_last_method = 926 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 927 CompilerCounters::cmname_buffer_length, 928 "", CHECK); 929 930 _perf_last_failed_method = 931 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 932 CompilerCounters::cmname_buffer_length, 933 "", CHECK); 934 935 _perf_last_invalidated_method = 936 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 937 CompilerCounters::cmname_buffer_length, 938 "", CHECK); 939 940 _perf_last_compile_type = 941 PerfDataManager::create_variable(SUN_CI, "lastType", 942 PerfData::U_None, 943 (jlong)CompileBroker::no_compile, 944 CHECK); 945 946 _perf_last_compile_size = 947 PerfDataManager::create_variable(SUN_CI, "lastSize", 948 PerfData::U_Bytes, 949 (jlong)CompileBroker::no_compile, 950 CHECK); 951 952 953 _perf_last_failed_type = 954 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 955 PerfData::U_None, 956 (jlong)CompileBroker::no_compile, 957 CHECK); 958 959 _perf_last_invalidated_type = 960 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 961 PerfData::U_None, 962 (jlong)CompileBroker::no_compile, 963 CHECK); 964 } 965 966 _initialized = true; 967 } 968 969 970 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 971 AbstractCompiler* comp, bool compiler_thread, TRAPS) { 972 JavaThread* thread = NULL; 973 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0); 974 instanceKlassHandle klass (THREAD, k); 975 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 976 Handle string = java_lang_String::create_from_str(name, CHECK_0); 977 978 // Initialize thread_oop to put it into the system threadGroup 979 Handle thread_group (THREAD, Universe::system_thread_group()); 980 JavaValue result(T_VOID); 981 JavaCalls::call_special(&result, thread_oop, 982 klass, 983 vmSymbols::object_initializer_name(), 984 vmSymbols::threadgroup_string_void_signature(), 985 thread_group, 986 string, 987 CHECK_0); 988 989 { 990 MutexLocker mu(Threads_lock, THREAD); 991 if (compiler_thread) { 992 thread = new CompilerThread(queue, counters); 993 } else { 994 thread = new CodeCacheSweeperThread(); 995 } 996 // At this point the new CompilerThread data-races with this startup 997 // thread (which I believe is the primoridal thread and NOT the VM 998 // thread). This means Java bytecodes being executed at startup can 999 // queue compile jobs which will run at whatever default priority the 1000 // newly created CompilerThread runs at. 1001 1002 1003 // At this point it may be possible that no osthread was created for the 1004 // JavaThread due to lack of memory. We would have to throw an exception 1005 // in that case. However, since this must work and we do not allow 1006 // exceptions anyway, check and abort if this fails. 1007 1008 if (thread == NULL || thread->osthread() == NULL) { 1009 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1010 os::native_thread_creation_failed_msg()); 1011 } 1012 1013 java_lang_Thread::set_thread(thread_oop(), thread); 1014 1015 // Note that this only sets the JavaThread _priority field, which by 1016 // definition is limited to Java priorities and not OS priorities. 1017 // The os-priority is set in the CompilerThread startup code itself 1018 1019 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1020 1021 // Note that we cannot call os::set_priority because it expects Java 1022 // priorities and we are *explicitly* using OS priorities so that it's 1023 // possible to set the compiler thread priority higher than any Java 1024 // thread. 1025 1026 int native_prio = CompilerThreadPriority; 1027 if (native_prio == -1) { 1028 if (UseCriticalCompilerThreadPriority) { 1029 native_prio = os::java_to_os_priority[CriticalPriority]; 1030 } else { 1031 native_prio = os::java_to_os_priority[NearMaxPriority]; 1032 } 1033 } 1034 os::set_native_priority(thread, native_prio); 1035 1036 java_lang_Thread::set_daemon(thread_oop()); 1037 1038 thread->set_threadObj(thread_oop()); 1039 if (compiler_thread) { 1040 thread->as_CompilerThread()->set_compiler(comp); 1041 } 1042 Threads::add(thread); 1043 Thread::start(thread); 1044 } 1045 1046 // Let go of Threads_lock before yielding 1047 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1048 1049 return thread; 1050 } 1051 1052 1053 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) { 1054 EXCEPTION_MARK; 1055 #if !defined(ZERO) && !defined(SHARK) 1056 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1057 #endif // !ZERO && !SHARK 1058 // Initialize the compilation queue 1059 if (c2_compiler_count > 0) { 1060 _c2_compile_queue = new CompileQueue("C2 compile queue", MethodCompileQueue_lock); 1061 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1062 } 1063 if (c1_compiler_count > 0) { 1064 _c1_compile_queue = new CompileQueue("C1 compile queue", MethodCompileQueue_lock); 1065 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1066 } 1067 1068 int compiler_count = c1_compiler_count + c2_compiler_count; 1069 1070 char name_buffer[256]; 1071 const bool compiler_thread = true; 1072 for (int i = 0; i < c2_compiler_count; i++) { 1073 // Create a name for our thread. 1074 sprintf(name_buffer, "C2 CompilerThread%d", i); 1075 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1076 // Shark and C2 1077 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK); 1078 } 1079 1080 for (int i = c2_compiler_count; i < compiler_count; i++) { 1081 // Create a name for our thread. 1082 sprintf(name_buffer, "C1 CompilerThread%d", i); 1083 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1084 // C1 1085 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK); 1086 } 1087 1088 if (UsePerfData) { 1089 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1090 } 1091 1092 if (MethodFlushing) { 1093 // Initialize the sweeper thread 1094 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK); 1095 } 1096 } 1097 1098 1099 /** 1100 * Set the methods on the stack as on_stack so that redefine classes doesn't 1101 * reclaim them. This method is executed at a safepoint. 1102 */ 1103 void CompileBroker::mark_on_stack() { 1104 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1105 // Since we are at a safepoint, we do not need a lock to access 1106 // the compile queues. 1107 if (_c2_compile_queue != NULL) { 1108 _c2_compile_queue->mark_on_stack(); 1109 } 1110 if (_c1_compile_queue != NULL) { 1111 _c1_compile_queue->mark_on_stack(); 1112 } 1113 } 1114 1115 // ------------------------------------------------------------------ 1116 // CompileBroker::compile_method 1117 // 1118 // Request compilation of a method. 1119 void CompileBroker::compile_method_base(methodHandle method, 1120 int osr_bci, 1121 int comp_level, 1122 methodHandle hot_method, 1123 int hot_count, 1124 const char* comment, 1125 Thread* thread) { 1126 // do nothing if compiler thread(s) is not available 1127 if (!_initialized) { 1128 return; 1129 } 1130 1131 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1132 assert(method->method_holder()->oop_is_instance(), 1133 "sanity check"); 1134 assert(!method->method_holder()->is_not_initialized(), 1135 "method holder must be initialized"); 1136 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1137 1138 if (CIPrintRequests) { 1139 tty->print("request: "); 1140 method->print_short_name(tty); 1141 if (osr_bci != InvocationEntryBci) { 1142 tty->print(" osr_bci: %d", osr_bci); 1143 } 1144 tty->print(" comment: %s count: %d", comment, hot_count); 1145 if (!hot_method.is_null()) { 1146 tty->print(" hot: "); 1147 if (hot_method() != method()) { 1148 hot_method->print_short_name(tty); 1149 } else { 1150 tty->print("yes"); 1151 } 1152 } 1153 tty->cr(); 1154 } 1155 1156 // A request has been made for compilation. Before we do any 1157 // real work, check to see if the method has been compiled 1158 // in the meantime with a definitive result. 1159 if (compilation_is_complete(method, osr_bci, comp_level)) { 1160 return; 1161 } 1162 1163 #ifndef PRODUCT 1164 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1165 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1166 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1167 return; 1168 } 1169 } 1170 #endif 1171 1172 // If this method is already in the compile queue, then 1173 // we do not block the current thread. 1174 if (compilation_is_in_queue(method)) { 1175 // We may want to decay our counter a bit here to prevent 1176 // multiple denied requests for compilation. This is an 1177 // open compilation policy issue. Note: The other possibility, 1178 // in the case that this is a blocking compile request, is to have 1179 // all subsequent blocking requesters wait for completion of 1180 // ongoing compiles. Note that in this case we'll need a protocol 1181 // for freeing the associated compile tasks. [Or we could have 1182 // a single static monitor on which all these waiters sleep.] 1183 return; 1184 } 1185 1186 // If the requesting thread is holding the pending list lock 1187 // then we just return. We can't risk blocking while holding 1188 // the pending list lock or a 3-way deadlock may occur 1189 // between the reference handler thread, a GC (instigated 1190 // by a compiler thread), and compiled method registration. 1191 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1192 return; 1193 } 1194 1195 if (TieredCompilation) { 1196 // Tiered policy requires MethodCounters to exist before adding a method to 1197 // the queue. Create if we don't have them yet. 1198 method->get_method_counters(thread); 1199 } 1200 1201 // Outputs from the following MutexLocker block: 1202 CompileTask* task = NULL; 1203 bool blocking = false; 1204 CompileQueue* queue = compile_queue(comp_level); 1205 1206 // Acquire our lock. 1207 { 1208 MutexLocker locker(queue->lock(), thread); 1209 1210 // Make sure the method has not slipped into the queues since 1211 // last we checked; note that those checks were "fast bail-outs". 1212 // Here we need to be more careful, see 14012000 below. 1213 if (compilation_is_in_queue(method)) { 1214 return; 1215 } 1216 1217 // We need to check again to see if the compilation has 1218 // completed. A previous compilation may have registered 1219 // some result. 1220 if (compilation_is_complete(method, osr_bci, comp_level)) { 1221 return; 1222 } 1223 1224 // We now know that this compilation is not pending, complete, 1225 // or prohibited. Assign a compile_id to this compilation 1226 // and check to see if it is in our [Start..Stop) range. 1227 int compile_id = assign_compile_id(method, osr_bci); 1228 if (compile_id == 0) { 1229 // The compilation falls outside the allowed range. 1230 return; 1231 } 1232 1233 // Should this thread wait for completion of the compile? 1234 blocking = is_compile_blocking(); 1235 1236 // We will enter the compilation in the queue. 1237 // 14012000: Note that this sets the queued_for_compile bits in 1238 // the target method. We can now reason that a method cannot be 1239 // queued for compilation more than once, as follows: 1240 // Before a thread queues a task for compilation, it first acquires 1241 // the compile queue lock, then checks if the method's queued bits 1242 // are set or it has already been compiled. Thus there can not be two 1243 // instances of a compilation task for the same method on the 1244 // compilation queue. Consider now the case where the compilation 1245 // thread has already removed a task for that method from the queue 1246 // and is in the midst of compiling it. In this case, the 1247 // queued_for_compile bits must be set in the method (and these 1248 // will be visible to the current thread, since the bits were set 1249 // under protection of the compile queue lock, which we hold now. 1250 // When the compilation completes, the compiler thread first sets 1251 // the compilation result and then clears the queued_for_compile 1252 // bits. Neither of these actions are protected by a barrier (or done 1253 // under the protection of a lock), so the only guarantee we have 1254 // (on machines with TSO (Total Store Order)) is that these values 1255 // will update in that order. As a result, the only combinations of 1256 // these bits that the current thread will see are, in temporal order: 1257 // <RESULT, QUEUE> : 1258 // <0, 1> : in compile queue, but not yet compiled 1259 // <1, 1> : compiled but queue bit not cleared 1260 // <1, 0> : compiled and queue bit cleared 1261 // Because we first check the queue bits then check the result bits, 1262 // we are assured that we cannot introduce a duplicate task. 1263 // Note that if we did the tests in the reverse order (i.e. check 1264 // result then check queued bit), we could get the result bit before 1265 // the compilation completed, and the queue bit after the compilation 1266 // completed, and end up introducing a "duplicate" (redundant) task. 1267 // In that case, the compiler thread should first check if a method 1268 // has already been compiled before trying to compile it. 1269 // NOTE: in the event that there are multiple compiler threads and 1270 // there is de-optimization/recompilation, things will get hairy, 1271 // and in that case it's best to protect both the testing (here) of 1272 // these bits, and their updating (here and elsewhere) under a 1273 // common lock. 1274 task = create_compile_task(queue, 1275 compile_id, method, 1276 osr_bci, comp_level, 1277 hot_method, hot_count, comment, 1278 blocking); 1279 } 1280 1281 if (blocking) { 1282 wait_for_completion(task); 1283 } 1284 } 1285 1286 1287 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1288 int comp_level, 1289 methodHandle hot_method, int hot_count, 1290 const char* comment, Thread* THREAD) { 1291 // make sure arguments make sense 1292 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1293 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1294 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1295 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1296 // allow any levels for WhiteBox 1297 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1298 // return quickly if possible 1299 1300 // lock, make sure that the compilation 1301 // isn't prohibited in a straightforward way. 1302 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1303 if (comp == NULL || !comp->can_compile_method(method) || 1304 compilation_is_prohibited(method, osr_bci, comp_level)) { 1305 return NULL; 1306 } 1307 1308 if (osr_bci == InvocationEntryBci) { 1309 // standard compilation 1310 nmethod* method_code = method->code(); 1311 if (method_code != NULL) { 1312 if (compilation_is_complete(method, osr_bci, comp_level)) { 1313 return method_code; 1314 } 1315 } 1316 if (method->is_not_compilable(comp_level)) { 1317 return NULL; 1318 } 1319 } else { 1320 // osr compilation 1321 #ifndef TIERED 1322 // seems like an assert of dubious value 1323 assert(comp_level == CompLevel_highest_tier, 1324 "all OSR compiles are assumed to be at a single compilation lavel"); 1325 #endif // TIERED 1326 // We accept a higher level osr method 1327 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1328 if (nm != NULL) return nm; 1329 if (method->is_not_osr_compilable(comp_level)) return NULL; 1330 } 1331 1332 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1333 // some prerequisites that are compiler specific 1334 if (comp->is_c2() || comp->is_shark()) { 1335 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1336 // Resolve all classes seen in the signature of the method 1337 // we are compiling. 1338 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1339 } 1340 1341 // If the method is native, do the lookup in the thread requesting 1342 // the compilation. Native lookups can load code, which is not 1343 // permitted during compilation. 1344 // 1345 // Note: A native method implies non-osr compilation which is 1346 // checked with an assertion at the entry of this method. 1347 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1348 bool in_base_library; 1349 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1350 if (HAS_PENDING_EXCEPTION) { 1351 // In case of an exception looking up the method, we just forget 1352 // about it. The interpreter will kick-in and throw the exception. 1353 method->set_not_compilable(); // implies is_not_osr_compilable() 1354 CLEAR_PENDING_EXCEPTION; 1355 return NULL; 1356 } 1357 assert(method->has_native_function(), "must have native code by now"); 1358 } 1359 1360 // RedefineClasses() has replaced this method; just return 1361 if (method->is_old()) { 1362 return NULL; 1363 } 1364 1365 // JVMTI -- post_compile_event requires jmethod_id() that may require 1366 // a lock the compiling thread can not acquire. Prefetch it here. 1367 if (JvmtiExport::should_post_compiled_method_load()) { 1368 method->jmethod_id(); 1369 } 1370 1371 // do the compilation 1372 if (method->is_native()) { 1373 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1374 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1375 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1376 // 1377 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1378 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1379 AdapterHandlerLibrary::create_native_wrapper(method); 1380 } else { 1381 return NULL; 1382 } 1383 } else { 1384 // If the compiler is shut off due to code cache getting full 1385 // fail out now so blocking compiles dont hang the java thread 1386 if (!should_compile_new_jobs()) { 1387 CompilationPolicy::policy()->delay_compilation(method()); 1388 return NULL; 1389 } 1390 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1391 } 1392 1393 // return requested nmethod 1394 // We accept a higher level osr method 1395 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1396 } 1397 1398 1399 // ------------------------------------------------------------------ 1400 // CompileBroker::compilation_is_complete 1401 // 1402 // See if compilation of this method is already complete. 1403 bool CompileBroker::compilation_is_complete(methodHandle method, 1404 int osr_bci, 1405 int comp_level) { 1406 bool is_osr = (osr_bci != standard_entry_bci); 1407 if (is_osr) { 1408 if (method->is_not_osr_compilable(comp_level)) { 1409 return true; 1410 } else { 1411 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1412 return (result != NULL); 1413 } 1414 } else { 1415 if (method->is_not_compilable(comp_level)) { 1416 return true; 1417 } else { 1418 nmethod* result = method->code(); 1419 if (result == NULL) return false; 1420 return comp_level == result->comp_level(); 1421 } 1422 } 1423 } 1424 1425 1426 /** 1427 * See if this compilation is already requested. 1428 * 1429 * Implementation note: there is only a single "is in queue" bit 1430 * for each method. This means that the check below is overly 1431 * conservative in the sense that an osr compilation in the queue 1432 * will block a normal compilation from entering the queue (and vice 1433 * versa). This can be remedied by a full queue search to disambiguate 1434 * cases. If it is deemed profitable, this may be done. 1435 */ 1436 bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1437 return method->queued_for_compilation(); 1438 } 1439 1440 // ------------------------------------------------------------------ 1441 // CompileBroker::compilation_is_prohibited 1442 // 1443 // See if this compilation is not allowed. 1444 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1445 bool is_native = method->is_native(); 1446 // Some compilers may not support the compilation of natives. 1447 AbstractCompiler *comp = compiler(comp_level); 1448 if (is_native && 1449 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1450 method->set_not_compilable_quietly(comp_level); 1451 return true; 1452 } 1453 1454 bool is_osr = (osr_bci != standard_entry_bci); 1455 // Some compilers may not support on stack replacement. 1456 if (is_osr && 1457 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1458 method->set_not_osr_compilable(comp_level); 1459 return true; 1460 } 1461 1462 // The method may be explicitly excluded by the user. 1463 bool quietly; 1464 if (CompilerOracle::should_exclude(method, quietly)) { 1465 if (!quietly) { 1466 // This does not happen quietly... 1467 ResourceMark rm; 1468 tty->print("### Excluding %s:%s", 1469 method->is_native() ? "generation of native wrapper" : "compile", 1470 (method->is_static() ? " static" : "")); 1471 method->print_short_name(tty); 1472 tty->cr(); 1473 } 1474 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1475 } 1476 1477 return false; 1478 } 1479 1480 /** 1481 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1482 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1483 * The function also allows to generate separate compilation IDs for OSR compilations. 1484 */ 1485 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1486 #ifdef ASSERT 1487 bool is_osr = (osr_bci != standard_entry_bci); 1488 int id; 1489 if (method->is_native()) { 1490 assert(!is_osr, "can't be osr"); 1491 // Adapters, native wrappers and method handle intrinsics 1492 // should be generated always. 1493 return Atomic::add(1, &_compilation_id); 1494 } else if (CICountOSR && is_osr) { 1495 id = Atomic::add(1, &_osr_compilation_id); 1496 if (CIStartOSR <= id && id < CIStopOSR) { 1497 return id; 1498 } 1499 } else { 1500 id = Atomic::add(1, &_compilation_id); 1501 if (CIStart <= id && id < CIStop) { 1502 return id; 1503 } 1504 } 1505 1506 // Method was not in the appropriate compilation range. 1507 method->set_not_compilable_quietly(); 1508 return 0; 1509 #else 1510 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1511 // only _compilation_id is incremented. 1512 return Atomic::add(1, &_compilation_id); 1513 #endif 1514 } 1515 1516 /** 1517 * Should the current thread block until this compilation request 1518 * has been fulfilled? 1519 */ 1520 bool CompileBroker::is_compile_blocking() { 1521 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1522 return !BackgroundCompilation; 1523 } 1524 1525 1526 // ------------------------------------------------------------------ 1527 // CompileBroker::preload_classes 1528 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1529 // Move this code over from c1_Compiler.cpp 1530 ShouldNotReachHere(); 1531 } 1532 1533 1534 // ------------------------------------------------------------------ 1535 // CompileBroker::create_compile_task 1536 // 1537 // Create a CompileTask object representing the current request for 1538 // compilation. Add this task to the queue. 1539 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1540 int compile_id, 1541 methodHandle method, 1542 int osr_bci, 1543 int comp_level, 1544 methodHandle hot_method, 1545 int hot_count, 1546 const char* comment, 1547 bool blocking) { 1548 CompileTask* new_task = CompileTask::allocate(); 1549 new_task->initialize(compile_id, method, osr_bci, comp_level, 1550 hot_method, hot_count, comment, 1551 blocking); 1552 queue->add(new_task); 1553 return new_task; 1554 } 1555 1556 1557 /** 1558 * Wait for the compilation task to complete. 1559 */ 1560 void CompileBroker::wait_for_completion(CompileTask* task) { 1561 if (CIPrintCompileQueue) { 1562 ttyLocker ttyl; 1563 tty->print_cr("BLOCKING FOR COMPILE"); 1564 } 1565 1566 assert(task->is_blocking(), "can only wait on blocking task"); 1567 1568 JavaThread* thread = JavaThread::current(); 1569 thread->set_blocked_on_compilation(true); 1570 1571 methodHandle method(thread, task->method()); 1572 { 1573 MutexLocker waiter(task->lock(), thread); 1574 1575 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1576 task->lock()->wait(); 1577 } 1578 } 1579 1580 thread->set_blocked_on_compilation(false); 1581 if (is_compilation_disabled_forever()) { 1582 CompileTask::free(task); 1583 return; 1584 } 1585 1586 // It is harmless to check this status without the lock, because 1587 // completion is a stable property (until the task object is recycled). 1588 assert(task->is_complete(), "Compilation should have completed"); 1589 assert(task->code_handle() == NULL, "must be reset"); 1590 1591 // By convention, the waiter is responsible for recycling a 1592 // blocking CompileTask. Since there is only one waiter ever 1593 // waiting on a CompileTask, we know that no one else will 1594 // be using this CompileTask; we can free it. 1595 CompileTask::free(task); 1596 } 1597 1598 /** 1599 * Initialize compiler thread(s) + compiler object(s). The postcondition 1600 * of this function is that the compiler runtimes are initialized and that 1601 * compiler threads can start compiling. 1602 */ 1603 bool CompileBroker::init_compiler_runtime() { 1604 CompilerThread* thread = CompilerThread::current(); 1605 AbstractCompiler* comp = thread->compiler(); 1606 // Final sanity check - the compiler object must exist 1607 guarantee(comp != NULL, "Compiler object must exist"); 1608 1609 int system_dictionary_modification_counter; 1610 { 1611 MutexLocker locker(Compile_lock, thread); 1612 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1613 } 1614 1615 { 1616 // Must switch to native to allocate ci_env 1617 ThreadToNativeFromVM ttn(thread); 1618 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1619 // Cache Jvmti state 1620 ci_env.cache_jvmti_state(); 1621 // Cache DTrace flags 1622 ci_env.cache_dtrace_flags(); 1623 1624 // Switch back to VM state to do compiler initialization 1625 ThreadInVMfromNative tv(thread); 1626 ResetNoHandleMark rnhm; 1627 1628 1629 if (!comp->is_shark()) { 1630 // Perform per-thread and global initializations 1631 comp->initialize(); 1632 } 1633 } 1634 1635 if (comp->is_failed()) { 1636 disable_compilation_forever(); 1637 // If compiler initialization failed, no compiler thread that is specific to a 1638 // particular compiler runtime will ever start to compile methods. 1639 shutdown_compiler_runtime(comp, thread); 1640 return false; 1641 } 1642 1643 // C1 specific check 1644 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1645 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1646 return false; 1647 } 1648 1649 return true; 1650 } 1651 1652 /** 1653 * If C1 and/or C2 initialization failed, we shut down all compilation. 1654 * We do this to keep things simple. This can be changed if it ever turns 1655 * out to be a problem. 1656 */ 1657 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1658 // Free buffer blob, if allocated 1659 if (thread->get_buffer_blob() != NULL) { 1660 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1661 CodeCache::free(thread->get_buffer_blob()); 1662 } 1663 1664 if (comp->should_perform_shutdown()) { 1665 // There are two reasons for shutting down the compiler 1666 // 1) compiler runtime initialization failed 1667 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1668 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1669 1670 // Only one thread per compiler runtime object enters here 1671 // Set state to shut down 1672 comp->set_shut_down(); 1673 1674 // Delete all queued compilation tasks to make compiler threads exit faster. 1675 if (_c1_compile_queue != NULL) { 1676 _c1_compile_queue->free_all(); 1677 } 1678 1679 if (_c2_compile_queue != NULL) { 1680 _c2_compile_queue->free_all(); 1681 } 1682 1683 // Set flags so that we continue execution with using interpreter only. 1684 UseCompiler = false; 1685 UseInterpreter = true; 1686 1687 // We could delete compiler runtimes also. However, there are references to 1688 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1689 // fail. This can be done later if necessary. 1690 } 1691 } 1692 1693 // ------------------------------------------------------------------ 1694 // CompileBroker::compiler_thread_loop 1695 // 1696 // The main loop run by a CompilerThread. 1697 void CompileBroker::compiler_thread_loop() { 1698 CompilerThread* thread = CompilerThread::current(); 1699 CompileQueue* queue = thread->queue(); 1700 // For the thread that initializes the ciObjectFactory 1701 // this resource mark holds all the shared objects 1702 ResourceMark rm; 1703 1704 // First thread to get here will initialize the compiler interface 1705 1706 if (!ciObjectFactory::is_initialized()) { 1707 ASSERT_IN_VM; 1708 MutexLocker only_one (CompileThread_lock, thread); 1709 if (!ciObjectFactory::is_initialized()) { 1710 ciObjectFactory::initialize(); 1711 } 1712 } 1713 1714 // Open a log. 1715 if (LogCompilation) { 1716 init_compiler_thread_log(); 1717 } 1718 CompileLog* log = thread->log(); 1719 if (log != NULL) { 1720 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1721 thread->name(), 1722 os::current_thread_id(), 1723 os::current_process_id()); 1724 log->stamp(); 1725 log->end_elem(); 1726 } 1727 1728 // If compiler thread/runtime initialization fails, exit the compiler thread 1729 if (!init_compiler_runtime()) { 1730 return; 1731 } 1732 1733 // Poll for new compilation tasks as long as the JVM runs. Compilation 1734 // should only be disabled if something went wrong while initializing the 1735 // compiler runtimes. This, in turn, should not happen. The only known case 1736 // when compiler runtime initialization fails is if there is not enough free 1737 // space in the code cache to generate the necessary stubs, etc. 1738 while (!is_compilation_disabled_forever()) { 1739 // We need this HandleMark to avoid leaking VM handles. 1740 HandleMark hm(thread); 1741 1742 CompileTask* task = queue->get(); 1743 if (task == NULL) { 1744 continue; 1745 } 1746 1747 // Give compiler threads an extra quanta. They tend to be bursty and 1748 // this helps the compiler to finish up the job. 1749 if (CompilerThreadHintNoPreempt) { 1750 os::hint_no_preempt(); 1751 } 1752 1753 // trace per thread time and compile statistics 1754 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1755 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1756 1757 // Assign the task to the current thread. Mark this compilation 1758 // thread as active for the profiler. 1759 CompileTaskWrapper ctw(task); 1760 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1761 task->set_code_handle(&result_handle); 1762 methodHandle method(thread, task->method()); 1763 1764 // Never compile a method if breakpoints are present in it 1765 if (method()->number_of_breakpoints() == 0) { 1766 // Compile the method. 1767 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1768 invoke_compiler_on_method(task); 1769 } else { 1770 // After compilation is disabled, remove remaining methods from queue 1771 method->clear_queued_for_compilation(); 1772 task->set_failure_reason("compilation is disabled"); 1773 } 1774 } 1775 } 1776 1777 // Shut down compiler runtime 1778 shutdown_compiler_runtime(thread->compiler(), thread); 1779 } 1780 1781 // ------------------------------------------------------------------ 1782 // CompileBroker::init_compiler_thread_log 1783 // 1784 // Set up state required by +LogCompilation. 1785 void CompileBroker::init_compiler_thread_log() { 1786 CompilerThread* thread = CompilerThread::current(); 1787 char file_name[4*K]; 1788 FILE* fp = NULL; 1789 intx thread_id = os::current_thread_id(); 1790 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1791 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1792 if (dir == NULL) { 1793 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1794 thread_id, os::current_process_id()); 1795 } else { 1796 jio_snprintf(file_name, sizeof(file_name), 1797 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1798 os::file_separator(), thread_id, os::current_process_id()); 1799 } 1800 1801 fp = fopen(file_name, "at"); 1802 if (fp != NULL) { 1803 if (LogCompilation && Verbose) { 1804 tty->print_cr("Opening compilation log %s", file_name); 1805 } 1806 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1807 thread->init_log(log); 1808 1809 if (xtty != NULL) { 1810 ttyLocker ttyl; 1811 // Record any per thread log files 1812 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1813 } 1814 return; 1815 } 1816 } 1817 warning("Cannot open log file: %s", file_name); 1818 } 1819 1820 // ------------------------------------------------------------------ 1821 // CompileBroker::set_should_block 1822 // 1823 // Set _should_block. 1824 // Call this from the VM, with Threads_lock held and a safepoint requested. 1825 void CompileBroker::set_should_block() { 1826 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1827 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1828 #ifndef PRODUCT 1829 if (PrintCompilation && (Verbose || WizardMode)) 1830 tty->print_cr("notifying compiler thread pool to block"); 1831 #endif 1832 _should_block = true; 1833 } 1834 1835 // ------------------------------------------------------------------ 1836 // CompileBroker::maybe_block 1837 // 1838 // Call this from the compiler at convenient points, to poll for _should_block. 1839 void CompileBroker::maybe_block() { 1840 if (_should_block) { 1841 #ifndef PRODUCT 1842 if (PrintCompilation && (Verbose || WizardMode)) 1843 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1844 #endif 1845 ThreadInVMfromNative tivfn(JavaThread::current()); 1846 } 1847 } 1848 1849 // wrapper for CodeCache::print_summary() 1850 static void codecache_print(bool detailed) 1851 { 1852 ResourceMark rm; 1853 stringStream s; 1854 // Dump code cache into a buffer before locking the tty, 1855 { 1856 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1857 CodeCache::print_summary(&s, detailed); 1858 } 1859 ttyLocker ttyl; 1860 tty->print("%s", s.as_string()); 1861 } 1862 1863 // ------------------------------------------------------------------ 1864 // CompileBroker::invoke_compiler_on_method 1865 // 1866 // Compile a method. 1867 // 1868 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1869 if (PrintCompilation) { 1870 ResourceMark rm; 1871 task->print_tty(); 1872 } 1873 elapsedTimer time; 1874 1875 CompilerThread* thread = CompilerThread::current(); 1876 ResourceMark rm(thread); 1877 1878 if (LogEvents) { 1879 _compilation_log->log_compile(thread, task); 1880 } 1881 1882 // Common flags. 1883 uint compile_id = task->compile_id(); 1884 int osr_bci = task->osr_bci(); 1885 bool is_osr = (osr_bci != standard_entry_bci); 1886 bool should_log = (thread->log() != NULL); 1887 bool should_break = false; 1888 int task_level = task->comp_level(); 1889 { 1890 // create the handle inside it's own block so it can't 1891 // accidentally be referenced once the thread transitions to 1892 // native. The NoHandleMark before the transition should catch 1893 // any cases where this occurs in the future. 1894 methodHandle method(thread, task->method()); 1895 should_break = check_break_at(method, compile_id, is_osr); 1896 if (should_log && !CompilerOracle::should_log(method)) { 1897 should_log = false; 1898 } 1899 assert(!method->is_native(), "no longer compile natives"); 1900 1901 // Save information about this method in case of failure. 1902 set_last_compile(thread, method, is_osr, task_level); 1903 1904 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1905 } 1906 1907 // Allocate a new set of JNI handles. 1908 push_jni_handle_block(); 1909 Method* target_handle = task->method(); 1910 int compilable = ciEnv::MethodCompilable; 1911 { 1912 int system_dictionary_modification_counter; 1913 { 1914 MutexLocker locker(Compile_lock, thread); 1915 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1916 } 1917 1918 NoHandleMark nhm; 1919 ThreadToNativeFromVM ttn(thread); 1920 1921 ciEnv ci_env(task, system_dictionary_modification_counter); 1922 if (should_break) { 1923 ci_env.set_break_at_compile(true); 1924 } 1925 if (should_log) { 1926 ci_env.set_log(thread->log()); 1927 } 1928 assert(thread->env() == &ci_env, "set by ci_env"); 1929 // The thread-env() field is cleared in ~CompileTaskWrapper. 1930 1931 // Cache Jvmti state 1932 ci_env.cache_jvmti_state(); 1933 1934 // Cache DTrace flags 1935 ci_env.cache_dtrace_flags(); 1936 1937 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1938 1939 TraceTime t1("compilation", &time); 1940 EventCompilation event; 1941 1942 AbstractCompiler *comp = compiler(task_level); 1943 if (comp == NULL) { 1944 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1945 } else { 1946 comp->compile_method(&ci_env, target, osr_bci); 1947 } 1948 1949 if (!ci_env.failing() && task->code() == NULL) { 1950 //assert(false, "compiler should always document failure"); 1951 // The compiler elected, without comment, not to register a result. 1952 // Do not attempt further compilations of this method. 1953 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1954 } 1955 1956 // Copy this bit to the enclosing block: 1957 compilable = ci_env.compilable(); 1958 1959 if (ci_env.failing()) { 1960 task->set_failure_reason(ci_env.failure_reason()); 1961 const char* retry_message = ci_env.retry_message(); 1962 if (_compilation_log != NULL) { 1963 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1964 } 1965 if (PrintCompilation) { 1966 FormatBufferResource msg = retry_message != NULL ? 1967 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1968 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1969 task->print_compilation(tty, msg); 1970 } 1971 } else { 1972 task->mark_success(); 1973 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 1974 if (_compilation_log != NULL) { 1975 nmethod* code = task->code(); 1976 if (code != NULL) { 1977 _compilation_log->log_nmethod(thread, code); 1978 } 1979 } 1980 } 1981 // simulate crash during compilation 1982 assert(task->compile_id() != CICrashAt, "just as planned"); 1983 if (event.should_commit()) { 1984 event.set_method(target->get_Method()); 1985 event.set_compileID(compile_id); 1986 event.set_compileLevel(task->comp_level()); 1987 event.set_succeded(task->is_success()); 1988 event.set_isOsr(is_osr); 1989 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 1990 event.set_inlinedBytes(task->num_inlined_bytecodes()); 1991 event.commit(); 1992 } 1993 } 1994 pop_jni_handle_block(); 1995 1996 methodHandle method(thread, task->method()); 1997 1998 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 1999 2000 collect_statistics(thread, time, task); 2001 2002 if (PrintCompilation && PrintCompilation2) { 2003 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2004 tty->print("%4d ", compile_id); // print compilation number 2005 tty->print("%s ", (is_osr ? "%" : " ")); 2006 if (task->code() != NULL) { 2007 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2008 } 2009 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2010 } 2011 2012 if (PrintCodeCacheOnCompilation) 2013 codecache_print(/* detailed= */ false); 2014 2015 // Disable compilation, if required. 2016 switch (compilable) { 2017 case ciEnv::MethodCompilable_never: 2018 if (is_osr) 2019 method->set_not_osr_compilable_quietly(); 2020 else 2021 method->set_not_compilable_quietly(); 2022 break; 2023 case ciEnv::MethodCompilable_not_at_tier: 2024 if (is_osr) 2025 method->set_not_osr_compilable_quietly(task_level); 2026 else 2027 method->set_not_compilable_quietly(task_level); 2028 break; 2029 } 2030 2031 // Note that the queued_for_compilation bits are cleared without 2032 // protection of a mutex. [They were set by the requester thread, 2033 // when adding the task to the compile queue -- at which time the 2034 // compile queue lock was held. Subsequently, we acquired the compile 2035 // queue lock to get this task off the compile queue; thus (to belabour 2036 // the point somewhat) our clearing of the bits must be occurring 2037 // only after the setting of the bits. See also 14012000 above. 2038 method->clear_queued_for_compilation(); 2039 2040 #ifdef ASSERT 2041 if (CollectedHeap::fired_fake_oom()) { 2042 // The current compile received a fake OOM during compilation so 2043 // go ahead and exit the VM since the test apparently succeeded 2044 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2045 vm_exit(0); 2046 } 2047 #endif 2048 } 2049 2050 /** 2051 * The CodeCache is full. Print out warning and disable compilation 2052 * or try code cache cleaning so compilation can continue later. 2053 */ 2054 void CompileBroker::handle_full_code_cache(int code_blob_type) { 2055 UseInterpreter = true; 2056 if (UseCompiler || AlwaysCompileLoopMethods ) { 2057 if (xtty != NULL) { 2058 ResourceMark rm; 2059 stringStream s; 2060 // Dump code cache state into a buffer before locking the tty, 2061 // because log_state() will use locks causing lock conflicts. 2062 CodeCache::log_state(&s); 2063 // Lock to prevent tearing 2064 ttyLocker ttyl; 2065 xtty->begin_elem("code_cache_full"); 2066 xtty->print("%s", s.as_string()); 2067 xtty->stamp(); 2068 xtty->end_elem(); 2069 } 2070 2071 #ifndef PRODUCT 2072 if (CompileTheWorld || ExitOnFullCodeCache) { 2073 codecache_print(/* detailed= */ true); 2074 before_exit(JavaThread::current()); 2075 exit_globals(); // will delete tty 2076 vm_direct_exit(CompileTheWorld ? 0 : 1); 2077 } 2078 #endif 2079 if (UseCodeCacheFlushing) { 2080 // Since code cache is full, immediately stop new compiles 2081 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2082 NMethodSweeper::log_sweep("disable_compiler"); 2083 } 2084 } else { 2085 disable_compilation_forever(); 2086 } 2087 2088 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning()); 2089 } 2090 } 2091 2092 // ------------------------------------------------------------------ 2093 // CompileBroker::set_last_compile 2094 // 2095 // Record this compilation for debugging purposes. 2096 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2097 ResourceMark rm; 2098 char* method_name = method->name()->as_C_string(); 2099 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2100 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2101 char current_method[CompilerCounters::cmname_buffer_length]; 2102 size_t maxLen = CompilerCounters::cmname_buffer_length; 2103 2104 if (UsePerfData) { 2105 const char* class_name = method->method_holder()->name()->as_C_string(); 2106 2107 size_t s1len = strlen(class_name); 2108 size_t s2len = strlen(method_name); 2109 2110 // check if we need to truncate the string 2111 if (s1len + s2len + 2 > maxLen) { 2112 2113 // the strategy is to lop off the leading characters of the 2114 // class name and the trailing characters of the method name. 2115 2116 if (s2len + 2 > maxLen) { 2117 // lop of the entire class name string, let snprintf handle 2118 // truncation of the method name. 2119 class_name += s1len; // null string 2120 } 2121 else { 2122 // lop off the extra characters from the front of the class name 2123 class_name += ((s1len + s2len + 2) - maxLen); 2124 } 2125 } 2126 2127 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2128 } 2129 2130 if (CICountOSR && is_osr) { 2131 _last_compile_type = osr_compile; 2132 } else { 2133 _last_compile_type = normal_compile; 2134 } 2135 _last_compile_level = comp_level; 2136 2137 if (UsePerfData) { 2138 CompilerCounters* counters = thread->counters(); 2139 counters->set_current_method(current_method); 2140 counters->set_compile_type((jlong)_last_compile_type); 2141 } 2142 } 2143 2144 2145 // ------------------------------------------------------------------ 2146 // CompileBroker::push_jni_handle_block 2147 // 2148 // Push on a new block of JNI handles. 2149 void CompileBroker::push_jni_handle_block() { 2150 JavaThread* thread = JavaThread::current(); 2151 2152 // Allocate a new block for JNI handles. 2153 // Inlined code from jni_PushLocalFrame() 2154 JNIHandleBlock* java_handles = thread->active_handles(); 2155 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2156 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2157 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2158 thread->set_active_handles(compile_handles); 2159 } 2160 2161 2162 // ------------------------------------------------------------------ 2163 // CompileBroker::pop_jni_handle_block 2164 // 2165 // Pop off the current block of JNI handles. 2166 void CompileBroker::pop_jni_handle_block() { 2167 JavaThread* thread = JavaThread::current(); 2168 2169 // Release our JNI handle block 2170 JNIHandleBlock* compile_handles = thread->active_handles(); 2171 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2172 thread->set_active_handles(java_handles); 2173 compile_handles->set_pop_frame_link(NULL); 2174 JNIHandleBlock::release_block(compile_handles, thread); // may block 2175 } 2176 2177 2178 // ------------------------------------------------------------------ 2179 // CompileBroker::check_break_at 2180 // 2181 // Should the compilation break at the current compilation. 2182 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2183 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2184 return true; 2185 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2186 return true; 2187 } else { 2188 return (compile_id == CIBreakAt); 2189 } 2190 } 2191 2192 // ------------------------------------------------------------------ 2193 // CompileBroker::collect_statistics 2194 // 2195 // Collect statistics about the compilation. 2196 2197 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2198 bool success = task->is_success(); 2199 methodHandle method (thread, task->method()); 2200 uint compile_id = task->compile_id(); 2201 bool is_osr = (task->osr_bci() != standard_entry_bci); 2202 nmethod* code = task->code(); 2203 CompilerCounters* counters = thread->counters(); 2204 2205 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2206 MutexLocker locker(CompileStatistics_lock); 2207 2208 // _perf variables are production performance counters which are 2209 // updated regardless of the setting of the CITime and CITimeEach flags 2210 // 2211 2212 // account all time, including bailouts and failures in this counter; 2213 // C1 and C2 counters are counting both successful and unsuccessful compiles 2214 _t_total_compilation.add(time); 2215 2216 if (!success) { 2217 _total_bailout_count++; 2218 if (UsePerfData) { 2219 _perf_last_failed_method->set_value(counters->current_method()); 2220 _perf_last_failed_type->set_value(counters->compile_type()); 2221 _perf_total_bailout_count->inc(); 2222 } 2223 _t_bailedout_compilation.add(time); 2224 } else if (code == NULL) { 2225 if (UsePerfData) { 2226 _perf_last_invalidated_method->set_value(counters->current_method()); 2227 _perf_last_invalidated_type->set_value(counters->compile_type()); 2228 _perf_total_invalidated_count->inc(); 2229 } 2230 _total_invalidated_count++; 2231 _t_invalidated_compilation.add(time); 2232 } else { 2233 // Compilation succeeded 2234 2235 // update compilation ticks - used by the implementation of 2236 // java.lang.management.CompilationMBean 2237 _perf_total_compilation->inc(time.ticks()); 2238 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2239 2240 if (CITime) { 2241 if (is_osr) { 2242 _t_osr_compilation.add(time); 2243 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2244 } else { 2245 _t_standard_compilation.add(time); 2246 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2247 } 2248 } 2249 2250 if (UsePerfData) { 2251 // save the name of the last method compiled 2252 _perf_last_method->set_value(counters->current_method()); 2253 _perf_last_compile_type->set_value(counters->compile_type()); 2254 _perf_last_compile_size->set_value(method->code_size() + 2255 task->num_inlined_bytecodes()); 2256 if (is_osr) { 2257 _perf_osr_compilation->inc(time.ticks()); 2258 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2259 } else { 2260 _perf_standard_compilation->inc(time.ticks()); 2261 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2262 } 2263 } 2264 2265 if (CITimeEach) { 2266 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2267 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2268 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2269 } 2270 2271 // Collect counts of successful compilations 2272 _sum_nmethod_size += code->total_size(); 2273 _sum_nmethod_code_size += code->insts_size(); 2274 _total_compile_count++; 2275 2276 if (UsePerfData) { 2277 _perf_sum_nmethod_size->inc( code->total_size()); 2278 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2279 _perf_total_compile_count->inc(); 2280 } 2281 2282 if (is_osr) { 2283 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2284 _total_osr_compile_count++; 2285 } else { 2286 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2287 _total_standard_compile_count++; 2288 } 2289 } 2290 // set the current method for the thread to null 2291 if (UsePerfData) counters->set_current_method(""); 2292 } 2293 2294 const char* CompileBroker::compiler_name(int comp_level) { 2295 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2296 if (comp == NULL) { 2297 return "no compiler"; 2298 } else { 2299 return (comp->name()); 2300 } 2301 } 2302 2303 void CompileBroker::print_times() { 2304 tty->cr(); 2305 tty->print_cr("Accumulated compiler times"); 2306 tty->print_cr("----------------------------------------------------------"); 2307 //0000000000111111111122222222223333333333444444444455555555556666666666 2308 //0123456789012345678901234567890123456789012345678901234567890123456789 2309 tty->print_cr(" Total compilation time : %7.3f s", CompileBroker::_t_total_compilation.seconds()); 2310 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s", 2311 CompileBroker::_t_standard_compilation.seconds(), 2312 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2313 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s", 2314 CompileBroker::_t_bailedout_compilation.seconds(), 2315 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count); 2316 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s", 2317 CompileBroker::_t_osr_compilation.seconds(), 2318 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count); 2319 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s", 2320 CompileBroker::_t_invalidated_compilation.seconds(), 2321 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count); 2322 2323 AbstractCompiler *comp = compiler(CompLevel_simple); 2324 if (comp != NULL) { 2325 tty->cr(); 2326 comp->print_timers(); 2327 } 2328 comp = compiler(CompLevel_full_optimization); 2329 if (comp != NULL) { 2330 tty->cr(); 2331 comp->print_timers(); 2332 } 2333 tty->cr(); 2334 tty->print_cr(" Total compiled methods : %8d methods", CompileBroker::_total_compile_count); 2335 tty->print_cr(" Standard compilation : %8d methods", CompileBroker::_total_standard_compile_count); 2336 tty->print_cr(" On stack replacement : %8d methods", CompileBroker::_total_osr_compile_count); 2337 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2338 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb); 2339 tty->print_cr(" Standard compilation : %8d bytes", CompileBroker::_sum_standard_bytes_compiled); 2340 tty->print_cr(" On stack replacement : %8d bytes", CompileBroker::_sum_osr_bytes_compiled); 2341 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2342 tty->print_cr(" Average compilation speed : %8d bytes/s", bps); 2343 tty->cr(); 2344 tty->print_cr(" nmethod code size : %8d bytes", CompileBroker::_sum_nmethod_code_size); 2345 tty->print_cr(" nmethod total size : %8d bytes", CompileBroker::_sum_nmethod_size); 2346 } 2347 2348 // Debugging output for failure 2349 void CompileBroker::print_last_compile() { 2350 if ( _last_compile_level != CompLevel_none && 2351 compiler(_last_compile_level) != NULL && 2352 _last_method_compiled != NULL && 2353 _last_compile_type != no_compile) { 2354 if (_last_compile_type == osr_compile) { 2355 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2356 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2357 } else { 2358 tty->print_cr("Last parse: %d+++(%d) %s", 2359 _compilation_id, _last_compile_level, _last_method_compiled); 2360 } 2361 } 2362 } 2363 2364 2365 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2366 #ifndef PRODUCT 2367 st->print_cr("Compiler thread printing unimplemented."); 2368 st->cr(); 2369 #endif 2370 }