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; 140 141 int CompileBroker::_total_bailout_count = 0; 142 int CompileBroker::_total_invalidated_count = 0; 143 int CompileBroker::_total_compile_count = 0; 144 int CompileBroker::_total_osr_compile_count = 0; 145 int CompileBroker::_total_standard_compile_count = 0; 146 147 int CompileBroker::_sum_osr_bytes_compiled = 0; 148 int CompileBroker::_sum_standard_bytes_compiled = 0; 149 int CompileBroker::_sum_nmethod_size = 0; 150 int CompileBroker::_sum_nmethod_code_size = 0; 151 152 long CompileBroker::_peak_compilation_time = 0; 153 154 CompileQueue* CompileBroker::_c2_compile_queue = NULL; 155 CompileQueue* CompileBroker::_c1_compile_queue = NULL; 156 157 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = 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 // CompileQueue::get 652 // 653 // Get the next CompileTask from a CompileQueue 654 CompileTask* CompileQueue::get() { 655 NMethodSweeper::possibly_sweep(); 656 657 MutexLocker locker(lock()); 658 // If _first is NULL we have no more compile jobs. There are two reasons for 659 // having no compile jobs: First, we compiled everything we wanted. Second, 660 // we ran out of code cache so compilation has been disabled. In the latter 661 // case we perform code cache sweeps to free memory such that we can re-enable 662 // compilation. 663 while (_first == NULL) { 664 // Exit loop if compilation is disabled forever 665 if (CompileBroker::is_compilation_disabled_forever()) { 666 return NULL; 667 } 668 669 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 670 // Wait a certain amount of time to possibly do another sweep. 671 // We must wait until stack scanning has happened so that we can 672 // transition a method's state from 'not_entrant' to 'zombie'. 673 long wait_time = NmethodSweepCheckInterval * 1000; 674 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 675 // Only one thread at a time can do sweeping. Scale the 676 // wait time according to the number of compiler threads. 677 // As a result, the next sweep is likely to happen every 100ms 678 // with an arbitrary number of threads that do sweeping. 679 wait_time = 100 * CICompilerCount; 680 } 681 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 682 if (timeout) { 683 MutexUnlocker ul(lock()); 684 NMethodSweeper::possibly_sweep(); 685 } 686 } else { 687 // If there are no compilation tasks and we can compile new jobs 688 // (i.e., there is enough free space in the code cache) there is 689 // no need to invoke the sweeper. As a result, the hotness of methods 690 // remains unchanged. This behavior is desired, since we want to keep 691 // the stable state, i.e., we do not want to evict methods from the 692 // code cache if it is unnecessary. 693 // We need a timed wait here, since compiler threads can exit if compilation 694 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 695 // is not critical and we do not want idle compiler threads to wake up too often. 696 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 697 } 698 } 699 700 if (CompileBroker::is_compilation_disabled_forever()) { 701 return NULL; 702 } 703 704 CompileTask* task; 705 { 706 No_Safepoint_Verifier nsv; 707 task = CompilationPolicy::policy()->select_task(this); 708 } 709 remove(task); 710 purge_stale_tasks(); // may temporarily release MCQ lock 711 return task; 712 } 713 714 // Clean & deallocate stale compile tasks. 715 // Temporarily releases MethodCompileQueue lock. 716 void CompileQueue::purge_stale_tasks() { 717 assert(lock()->owned_by_self(), "must own lock"); 718 if (_first_stale != NULL) { 719 // Stale tasks are purged when MCQ lock is released, 720 // but _first_stale updates are protected by MCQ lock. 721 // Once task processing starts and MCQ lock is released, 722 // other compiler threads can reuse _first_stale. 723 CompileTask* head = _first_stale; 724 _first_stale = NULL; 725 { 726 MutexUnlocker ul(lock()); 727 for (CompileTask* task = head; task != NULL; ) { 728 CompileTask* next_task = task->next(); 729 CompileTaskWrapper ctw(task); // Frees the task 730 task->set_failure_reason("stale task"); 731 task = next_task; 732 } 733 } 734 } 735 } 736 737 void CompileQueue::remove(CompileTask* task) { 738 assert(lock()->owned_by_self(), "must own lock"); 739 if (task->prev() != NULL) { 740 task->prev()->set_next(task->next()); 741 } else { 742 // max is the first element 743 assert(task == _first, "Sanity"); 744 _first = task->next(); 745 } 746 747 if (task->next() != NULL) { 748 task->next()->set_prev(task->prev()); 749 } else { 750 // max is the last element 751 assert(task == _last, "Sanity"); 752 _last = task->prev(); 753 } 754 --_size; 755 } 756 757 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 758 assert(lock()->owned_by_self(), "must own lock"); 759 remove(task); 760 761 // Enqueue the task for reclamation (should be done outside MCQ lock) 762 task->set_next(_first_stale); 763 task->set_prev(NULL); 764 _first_stale = task; 765 } 766 767 // methods in the compile queue need to be marked as used on the stack 768 // so that they don't get reclaimed by Redefine Classes 769 void CompileQueue::mark_on_stack() { 770 CompileTask* task = _first; 771 while (task != NULL) { 772 task->mark_on_stack(); 773 task = task->next(); 774 } 775 } 776 777 778 CompileQueue* CompileBroker::compile_queue(int comp_level) { 779 if (is_c2_compile(comp_level)) return _c2_compile_queue; 780 if (is_c1_compile(comp_level)) return _c1_compile_queue; 781 return NULL; 782 } 783 784 785 void CompileBroker::print_compile_queues(outputStream* st) { 786 _c1_compile_queue->print(st); 787 _c2_compile_queue->print(st); 788 } 789 790 791 void CompileQueue::print(outputStream* st) { 792 st->print_cr("Contents of %s", name()); 793 st->print_cr("----------------------------"); 794 CompileTask* task = _first; 795 if (task == NULL) { 796 st->print_cr("Empty");; 797 } else { 798 while (task != NULL) { 799 task->print_compilation(st, NULL, true, true); 800 task = task->next(); 801 } 802 } 803 st->print_cr("----------------------------"); 804 } 805 806 void CompileQueue::print_tty() { 807 ttyLocker ttyl; 808 print(tty); 809 } 810 811 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 812 813 _current_method[0] = '\0'; 814 _compile_type = CompileBroker::no_compile; 815 816 if (UsePerfData) { 817 ResourceMark rm; 818 819 // create the thread instance name space string - don't create an 820 // instance subspace if instance is -1 - keeps the adapterThread 821 // counters from having a ".0" namespace. 822 const char* thread_i = (instance == -1) ? thread_name : 823 PerfDataManager::name_space(thread_name, instance); 824 825 826 char* name = PerfDataManager::counter_name(thread_i, "method"); 827 _perf_current_method = 828 PerfDataManager::create_string_variable(SUN_CI, name, 829 cmname_buffer_length, 830 _current_method, CHECK); 831 832 name = PerfDataManager::counter_name(thread_i, "type"); 833 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 834 PerfData::U_None, 835 (jlong)_compile_type, 836 CHECK); 837 838 name = PerfDataManager::counter_name(thread_i, "time"); 839 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 840 PerfData::U_Ticks, CHECK); 841 842 name = PerfDataManager::counter_name(thread_i, "compiles"); 843 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 844 PerfData::U_Events, CHECK); 845 } 846 } 847 848 // ------------------------------------------------------------------ 849 // CompileBroker::compilation_init 850 // 851 // Initialize the Compilation object 852 void CompileBroker::compilation_init() { 853 _last_method_compiled[0] = '\0'; 854 855 // No need to initialize compilation system if we do not use it. 856 if (!UseCompiler) { 857 return; 858 } 859 #ifndef SHARK 860 // Set the interface to the current compiler(s). 861 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 862 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 863 #ifdef COMPILER1 864 if (c1_count > 0) { 865 _compilers[0] = new Compiler(); 866 } 867 #endif // COMPILER1 868 869 #ifdef COMPILER2 870 if (c2_count > 0) { 871 _compilers[1] = new C2Compiler(); 872 } 873 #endif // COMPILER2 874 875 #else // SHARK 876 int c1_count = 0; 877 int c2_count = 1; 878 879 _compilers[1] = new SharkCompiler(); 880 #endif // SHARK 881 882 // Start the CompilerThreads 883 init_compiler_threads(c1_count, c2_count); 884 // totalTime performance counter is always created as it is required 885 // by the implementation of java.lang.management.CompilationMBean. 886 { 887 EXCEPTION_MARK; 888 _perf_total_compilation = 889 PerfDataManager::create_counter(JAVA_CI, "totalTime", 890 PerfData::U_Ticks, CHECK); 891 } 892 893 894 if (UsePerfData) { 895 896 EXCEPTION_MARK; 897 898 // create the jvmstat performance counters 899 _perf_osr_compilation = 900 PerfDataManager::create_counter(SUN_CI, "osrTime", 901 PerfData::U_Ticks, CHECK); 902 903 _perf_standard_compilation = 904 PerfDataManager::create_counter(SUN_CI, "standardTime", 905 PerfData::U_Ticks, CHECK); 906 907 _perf_total_bailout_count = 908 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 909 PerfData::U_Events, CHECK); 910 911 _perf_total_invalidated_count = 912 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 913 PerfData::U_Events, CHECK); 914 915 _perf_total_compile_count = 916 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 917 PerfData::U_Events, CHECK); 918 _perf_total_osr_compile_count = 919 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 920 PerfData::U_Events, CHECK); 921 922 _perf_total_standard_compile_count = 923 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 924 PerfData::U_Events, CHECK); 925 926 _perf_sum_osr_bytes_compiled = 927 PerfDataManager::create_counter(SUN_CI, "osrBytes", 928 PerfData::U_Bytes, CHECK); 929 930 _perf_sum_standard_bytes_compiled = 931 PerfDataManager::create_counter(SUN_CI, "standardBytes", 932 PerfData::U_Bytes, CHECK); 933 934 _perf_sum_nmethod_size = 935 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 936 PerfData::U_Bytes, CHECK); 937 938 _perf_sum_nmethod_code_size = 939 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 940 PerfData::U_Bytes, CHECK); 941 942 _perf_last_method = 943 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 944 CompilerCounters::cmname_buffer_length, 945 "", CHECK); 946 947 _perf_last_failed_method = 948 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 949 CompilerCounters::cmname_buffer_length, 950 "", CHECK); 951 952 _perf_last_invalidated_method = 953 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 954 CompilerCounters::cmname_buffer_length, 955 "", CHECK); 956 957 _perf_last_compile_type = 958 PerfDataManager::create_variable(SUN_CI, "lastType", 959 PerfData::U_None, 960 (jlong)CompileBroker::no_compile, 961 CHECK); 962 963 _perf_last_compile_size = 964 PerfDataManager::create_variable(SUN_CI, "lastSize", 965 PerfData::U_Bytes, 966 (jlong)CompileBroker::no_compile, 967 CHECK); 968 969 970 _perf_last_failed_type = 971 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 972 PerfData::U_None, 973 (jlong)CompileBroker::no_compile, 974 CHECK); 975 976 _perf_last_invalidated_type = 977 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 978 PerfData::U_None, 979 (jlong)CompileBroker::no_compile, 980 CHECK); 981 } 982 983 _initialized = true; 984 } 985 986 987 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 988 AbstractCompiler* comp, TRAPS) { 989 CompilerThread* compiler_thread = NULL; 990 991 Klass* k = 992 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 993 true, CHECK_0); 994 instanceKlassHandle klass (THREAD, k); 995 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 996 Handle string = java_lang_String::create_from_str(name, CHECK_0); 997 998 // Initialize thread_oop to put it into the system threadGroup 999 Handle thread_group (THREAD, Universe::system_thread_group()); 1000 JavaValue result(T_VOID); 1001 JavaCalls::call_special(&result, thread_oop, 1002 klass, 1003 vmSymbols::object_initializer_name(), 1004 vmSymbols::threadgroup_string_void_signature(), 1005 thread_group, 1006 string, 1007 CHECK_0); 1008 1009 { 1010 MutexLocker mu(Threads_lock, THREAD); 1011 compiler_thread = new CompilerThread(queue, counters); 1012 // At this point the new CompilerThread data-races with this startup 1013 // thread (which I believe is the primoridal thread and NOT the VM 1014 // thread). This means Java bytecodes being executed at startup can 1015 // queue compile jobs which will run at whatever default priority the 1016 // newly created CompilerThread runs at. 1017 1018 1019 // At this point it may be possible that no osthread was created for the 1020 // JavaThread due to lack of memory. We would have to throw an exception 1021 // in that case. However, since this must work and we do not allow 1022 // exceptions anyway, check and abort if this fails. 1023 1024 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 1025 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1026 os::native_thread_creation_failed_msg()); 1027 } 1028 1029 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 1030 1031 // Note that this only sets the JavaThread _priority field, which by 1032 // definition is limited to Java priorities and not OS priorities. 1033 // The os-priority is set in the CompilerThread startup code itself 1034 1035 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1036 1037 // Note that we cannot call os::set_priority because it expects Java 1038 // priorities and we are *explicitly* using OS priorities so that it's 1039 // possible to set the compiler thread priority higher than any Java 1040 // thread. 1041 1042 int native_prio = CompilerThreadPriority; 1043 if (native_prio == -1) { 1044 if (UseCriticalCompilerThreadPriority) { 1045 native_prio = os::java_to_os_priority[CriticalPriority]; 1046 } else { 1047 native_prio = os::java_to_os_priority[NearMaxPriority]; 1048 } 1049 } 1050 os::set_native_priority(compiler_thread, native_prio); 1051 1052 java_lang_Thread::set_daemon(thread_oop()); 1053 1054 compiler_thread->set_threadObj(thread_oop()); 1055 compiler_thread->set_compiler(comp); 1056 Threads::add(compiler_thread); 1057 Thread::start(compiler_thread); 1058 } 1059 1060 // Let go of Threads_lock before yielding 1061 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1062 1063 return compiler_thread; 1064 } 1065 1066 1067 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 1068 EXCEPTION_MARK; 1069 #if !defined(ZERO) && !defined(SHARK) 1070 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1071 #endif // !ZERO && !SHARK 1072 // Initialize the compilation queue 1073 if (c2_compiler_count > 0) { 1074 _c2_compile_queue = new CompileQueue("C2 compile queue", MethodCompileQueue_lock); 1075 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1076 } 1077 if (c1_compiler_count > 0) { 1078 _c1_compile_queue = new CompileQueue("C1 compile queue", MethodCompileQueue_lock); 1079 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1080 } 1081 1082 int compiler_count = c1_compiler_count + c2_compiler_count; 1083 1084 _compiler_threads = 1085 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1086 1087 char name_buffer[256]; 1088 for (int i = 0; i < c2_compiler_count; i++) { 1089 // Create a name for our thread. 1090 sprintf(name_buffer, "C2 CompilerThread%d", i); 1091 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1092 // Shark and C2 1093 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK); 1094 _compiler_threads->append(new_thread); 1095 } 1096 1097 for (int i = c2_compiler_count; i < compiler_count; i++) { 1098 // Create a name for our thread. 1099 sprintf(name_buffer, "C1 CompilerThread%d", i); 1100 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1101 // C1 1102 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK); 1103 _compiler_threads->append(new_thread); 1104 } 1105 1106 if (UsePerfData) { 1107 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1108 } 1109 } 1110 1111 1112 /** 1113 * Set the methods on the stack as on_stack so that redefine classes doesn't 1114 * reclaim them. This method is executed at a safepoint. 1115 */ 1116 void CompileBroker::mark_on_stack() { 1117 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1118 // Since we are at a safepoint, we do not need a lock to access 1119 // the compile queues. 1120 if (_c2_compile_queue != NULL) { 1121 _c2_compile_queue->mark_on_stack(); 1122 } 1123 if (_c1_compile_queue != NULL) { 1124 _c1_compile_queue->mark_on_stack(); 1125 } 1126 } 1127 1128 // ------------------------------------------------------------------ 1129 // CompileBroker::compile_method 1130 // 1131 // Request compilation of a method. 1132 void CompileBroker::compile_method_base(methodHandle method, 1133 int osr_bci, 1134 int comp_level, 1135 methodHandle hot_method, 1136 int hot_count, 1137 const char* comment, 1138 Thread* thread) { 1139 // do nothing if compiler thread(s) is not available 1140 if (!_initialized) { 1141 return; 1142 } 1143 1144 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1145 assert(method->method_holder()->oop_is_instance(), 1146 "sanity check"); 1147 assert(!method->method_holder()->is_not_initialized(), 1148 "method holder must be initialized"); 1149 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1150 1151 if (CIPrintRequests) { 1152 tty->print("request: "); 1153 method->print_short_name(tty); 1154 if (osr_bci != InvocationEntryBci) { 1155 tty->print(" osr_bci: %d", osr_bci); 1156 } 1157 tty->print(" comment: %s count: %d", comment, hot_count); 1158 if (!hot_method.is_null()) { 1159 tty->print(" hot: "); 1160 if (hot_method() != method()) { 1161 hot_method->print_short_name(tty); 1162 } else { 1163 tty->print("yes"); 1164 } 1165 } 1166 tty->cr(); 1167 } 1168 1169 // A request has been made for compilation. Before we do any 1170 // real work, check to see if the method has been compiled 1171 // in the meantime with a definitive result. 1172 if (compilation_is_complete(method, osr_bci, comp_level)) { 1173 return; 1174 } 1175 1176 #ifndef PRODUCT 1177 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1178 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1179 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1180 return; 1181 } 1182 } 1183 #endif 1184 1185 // If this method is already in the compile queue, then 1186 // we do not block the current thread. 1187 if (compilation_is_in_queue(method)) { 1188 // We may want to decay our counter a bit here to prevent 1189 // multiple denied requests for compilation. This is an 1190 // open compilation policy issue. Note: The other possibility, 1191 // in the case that this is a blocking compile request, is to have 1192 // all subsequent blocking requesters wait for completion of 1193 // ongoing compiles. Note that in this case we'll need a protocol 1194 // for freeing the associated compile tasks. [Or we could have 1195 // a single static monitor on which all these waiters sleep.] 1196 return; 1197 } 1198 1199 // If the requesting thread is holding the pending list lock 1200 // then we just return. We can't risk blocking while holding 1201 // the pending list lock or a 3-way deadlock may occur 1202 // between the reference handler thread, a GC (instigated 1203 // by a compiler thread), and compiled method registration. 1204 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1205 return; 1206 } 1207 1208 // Outputs from the following MutexLocker block: 1209 CompileTask* task = NULL; 1210 bool blocking = false; 1211 CompileQueue* queue = compile_queue(comp_level); 1212 1213 // Acquire our lock. 1214 { 1215 MutexLocker locker(queue->lock(), thread); 1216 1217 // Make sure the method has not slipped into the queues since 1218 // last we checked; note that those checks were "fast bail-outs". 1219 // Here we need to be more careful, see 14012000 below. 1220 if (compilation_is_in_queue(method)) { 1221 return; 1222 } 1223 1224 // We need to check again to see if the compilation has 1225 // completed. A previous compilation may have registered 1226 // some result. 1227 if (compilation_is_complete(method, osr_bci, comp_level)) { 1228 return; 1229 } 1230 1231 // We now know that this compilation is not pending, complete, 1232 // or prohibited. Assign a compile_id to this compilation 1233 // and check to see if it is in our [Start..Stop) range. 1234 int compile_id = assign_compile_id(method, osr_bci); 1235 if (compile_id == 0) { 1236 // The compilation falls outside the allowed range. 1237 return; 1238 } 1239 1240 // Should this thread wait for completion of the compile? 1241 blocking = is_compile_blocking(); 1242 1243 // We will enter the compilation in the queue. 1244 // 14012000: Note that this sets the queued_for_compile bits in 1245 // the target method. We can now reason that a method cannot be 1246 // queued for compilation more than once, as follows: 1247 // Before a thread queues a task for compilation, it first acquires 1248 // the compile queue lock, then checks if the method's queued bits 1249 // are set or it has already been compiled. Thus there can not be two 1250 // instances of a compilation task for the same method on the 1251 // compilation queue. Consider now the case where the compilation 1252 // thread has already removed a task for that method from the queue 1253 // and is in the midst of compiling it. In this case, the 1254 // queued_for_compile bits must be set in the method (and these 1255 // will be visible to the current thread, since the bits were set 1256 // under protection of the compile queue lock, which we hold now. 1257 // When the compilation completes, the compiler thread first sets 1258 // the compilation result and then clears the queued_for_compile 1259 // bits. Neither of these actions are protected by a barrier (or done 1260 // under the protection of a lock), so the only guarantee we have 1261 // (on machines with TSO (Total Store Order)) is that these values 1262 // will update in that order. As a result, the only combinations of 1263 // these bits that the current thread will see are, in temporal order: 1264 // <RESULT, QUEUE> : 1265 // <0, 1> : in compile queue, but not yet compiled 1266 // <1, 1> : compiled but queue bit not cleared 1267 // <1, 0> : compiled and queue bit cleared 1268 // Because we first check the queue bits then check the result bits, 1269 // we are assured that we cannot introduce a duplicate task. 1270 // Note that if we did the tests in the reverse order (i.e. check 1271 // result then check queued bit), we could get the result bit before 1272 // the compilation completed, and the queue bit after the compilation 1273 // completed, and end up introducing a "duplicate" (redundant) task. 1274 // In that case, the compiler thread should first check if a method 1275 // has already been compiled before trying to compile it. 1276 // NOTE: in the event that there are multiple compiler threads and 1277 // there is de-optimization/recompilation, things will get hairy, 1278 // and in that case it's best to protect both the testing (here) of 1279 // these bits, and their updating (here and elsewhere) under a 1280 // common lock. 1281 task = create_compile_task(queue, 1282 compile_id, method, 1283 osr_bci, comp_level, 1284 hot_method, hot_count, comment, 1285 blocking); 1286 } 1287 1288 if (blocking) { 1289 wait_for_completion(task); 1290 } 1291 } 1292 1293 1294 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1295 int comp_level, 1296 methodHandle hot_method, int hot_count, 1297 const char* comment, Thread* THREAD) { 1298 // make sure arguments make sense 1299 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1300 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1301 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1302 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1303 // allow any levels for WhiteBox 1304 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1305 // return quickly if possible 1306 1307 // lock, make sure that the compilation 1308 // isn't prohibited in a straightforward way. 1309 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1310 if (comp == NULL || !comp->can_compile_method(method) || 1311 compilation_is_prohibited(method, osr_bci, comp_level)) { 1312 return NULL; 1313 } 1314 1315 if (osr_bci == InvocationEntryBci) { 1316 // standard compilation 1317 nmethod* method_code = method->code(); 1318 if (method_code != NULL) { 1319 if (compilation_is_complete(method, osr_bci, comp_level)) { 1320 return method_code; 1321 } 1322 } 1323 if (method->is_not_compilable(comp_level)) { 1324 return NULL; 1325 } 1326 } else { 1327 // osr compilation 1328 #ifndef TIERED 1329 // seems like an assert of dubious value 1330 assert(comp_level == CompLevel_highest_tier, 1331 "all OSR compiles are assumed to be at a single compilation lavel"); 1332 #endif // TIERED 1333 // We accept a higher level osr method 1334 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1335 if (nm != NULL) return nm; 1336 if (method->is_not_osr_compilable(comp_level)) return NULL; 1337 } 1338 1339 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1340 // some prerequisites that are compiler specific 1341 if (comp->is_c2() || comp->is_shark()) { 1342 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1343 // Resolve all classes seen in the signature of the method 1344 // we are compiling. 1345 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1346 } 1347 1348 // If the method is native, do the lookup in the thread requesting 1349 // the compilation. Native lookups can load code, which is not 1350 // permitted during compilation. 1351 // 1352 // Note: A native method implies non-osr compilation which is 1353 // checked with an assertion at the entry of this method. 1354 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1355 bool in_base_library; 1356 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1357 if (HAS_PENDING_EXCEPTION) { 1358 // In case of an exception looking up the method, we just forget 1359 // about it. The interpreter will kick-in and throw the exception. 1360 method->set_not_compilable(); // implies is_not_osr_compilable() 1361 CLEAR_PENDING_EXCEPTION; 1362 return NULL; 1363 } 1364 assert(method->has_native_function(), "must have native code by now"); 1365 } 1366 1367 // RedefineClasses() has replaced this method; just return 1368 if (method->is_old()) { 1369 return NULL; 1370 } 1371 1372 // JVMTI -- post_compile_event requires jmethod_id() that may require 1373 // a lock the compiling thread can not acquire. Prefetch it here. 1374 if (JvmtiExport::should_post_compiled_method_load()) { 1375 method->jmethod_id(); 1376 } 1377 1378 // do the compilation 1379 if (method->is_native()) { 1380 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1381 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1382 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1383 // 1384 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1385 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1386 AdapterHandlerLibrary::create_native_wrapper(method); 1387 } else { 1388 return NULL; 1389 } 1390 } else { 1391 // If the compiler is shut off due to code cache getting full 1392 // fail out now so blocking compiles dont hang the java thread 1393 if (!should_compile_new_jobs()) { 1394 CompilationPolicy::policy()->delay_compilation(method()); 1395 return NULL; 1396 } 1397 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1398 } 1399 1400 // return requested nmethod 1401 // We accept a higher level osr method 1402 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1403 } 1404 1405 1406 // ------------------------------------------------------------------ 1407 // CompileBroker::compilation_is_complete 1408 // 1409 // See if compilation of this method is already complete. 1410 bool CompileBroker::compilation_is_complete(methodHandle method, 1411 int osr_bci, 1412 int comp_level) { 1413 bool is_osr = (osr_bci != standard_entry_bci); 1414 if (is_osr) { 1415 if (method->is_not_osr_compilable(comp_level)) { 1416 return true; 1417 } else { 1418 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1419 return (result != NULL); 1420 } 1421 } else { 1422 if (method->is_not_compilable(comp_level)) { 1423 return true; 1424 } else { 1425 nmethod* result = method->code(); 1426 if (result == NULL) return false; 1427 return comp_level == result->comp_level(); 1428 } 1429 } 1430 } 1431 1432 1433 /** 1434 * See if this compilation is already requested. 1435 * 1436 * Implementation note: there is only a single "is in queue" bit 1437 * for each method. This means that the check below is overly 1438 * conservative in the sense that an osr compilation in the queue 1439 * will block a normal compilation from entering the queue (and vice 1440 * versa). This can be remedied by a full queue search to disambiguate 1441 * cases. If it is deemed profitable, this may be done. 1442 */ 1443 bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1444 return method->queued_for_compilation(); 1445 } 1446 1447 // ------------------------------------------------------------------ 1448 // CompileBroker::compilation_is_prohibited 1449 // 1450 // See if this compilation is not allowed. 1451 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1452 bool is_native = method->is_native(); 1453 // Some compilers may not support the compilation of natives. 1454 AbstractCompiler *comp = compiler(comp_level); 1455 if (is_native && 1456 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1457 method->set_not_compilable_quietly(comp_level); 1458 return true; 1459 } 1460 1461 bool is_osr = (osr_bci != standard_entry_bci); 1462 // Some compilers may not support on stack replacement. 1463 if (is_osr && 1464 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1465 method->set_not_osr_compilable(comp_level); 1466 return true; 1467 } 1468 1469 // The method may be explicitly excluded by the user. 1470 bool quietly; 1471 if (CompilerOracle::should_exclude(method, quietly)) { 1472 if (!quietly) { 1473 // This does not happen quietly... 1474 ResourceMark rm; 1475 tty->print("### Excluding %s:%s", 1476 method->is_native() ? "generation of native wrapper" : "compile", 1477 (method->is_static() ? " static" : "")); 1478 method->print_short_name(tty); 1479 tty->cr(); 1480 } 1481 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1482 } 1483 1484 return false; 1485 } 1486 1487 /** 1488 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1489 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1490 * The function also allows to generate separate compilation IDs for OSR compilations. 1491 */ 1492 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1493 #ifdef ASSERT 1494 bool is_osr = (osr_bci != standard_entry_bci); 1495 int id; 1496 if (method->is_native()) { 1497 assert(!is_osr, "can't be osr"); 1498 // Adapters, native wrappers and method handle intrinsics 1499 // should be generated always. 1500 return Atomic::add(1, &_compilation_id); 1501 } else if (CICountOSR && is_osr) { 1502 id = Atomic::add(1, &_osr_compilation_id); 1503 if (CIStartOSR <= id && id < CIStopOSR) { 1504 return id; 1505 } 1506 } else { 1507 id = Atomic::add(1, &_compilation_id); 1508 if (CIStart <= id && id < CIStop) { 1509 return id; 1510 } 1511 } 1512 1513 // Method was not in the appropriate compilation range. 1514 method->set_not_compilable_quietly(); 1515 return 0; 1516 #else 1517 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1518 // only _compilation_id is incremented. 1519 return Atomic::add(1, &_compilation_id); 1520 #endif 1521 } 1522 1523 /** 1524 * Should the current thread block until this compilation request 1525 * has been fulfilled? 1526 */ 1527 bool CompileBroker::is_compile_blocking() { 1528 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1529 return !BackgroundCompilation; 1530 } 1531 1532 1533 // ------------------------------------------------------------------ 1534 // CompileBroker::preload_classes 1535 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1536 // Move this code over from c1_Compiler.cpp 1537 ShouldNotReachHere(); 1538 } 1539 1540 1541 // ------------------------------------------------------------------ 1542 // CompileBroker::create_compile_task 1543 // 1544 // Create a CompileTask object representing the current request for 1545 // compilation. Add this task to the queue. 1546 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1547 int compile_id, 1548 methodHandle method, 1549 int osr_bci, 1550 int comp_level, 1551 methodHandle hot_method, 1552 int hot_count, 1553 const char* comment, 1554 bool blocking) { 1555 CompileTask* new_task = CompileTask::allocate(); 1556 new_task->initialize(compile_id, method, osr_bci, comp_level, 1557 hot_method, hot_count, comment, 1558 blocking); 1559 queue->add(new_task); 1560 return new_task; 1561 } 1562 1563 1564 /** 1565 * Wait for the compilation task to complete. 1566 */ 1567 void CompileBroker::wait_for_completion(CompileTask* task) { 1568 if (CIPrintCompileQueue) { 1569 ttyLocker ttyl; 1570 tty->print_cr("BLOCKING FOR COMPILE"); 1571 } 1572 1573 assert(task->is_blocking(), "can only wait on blocking task"); 1574 1575 JavaThread* thread = JavaThread::current(); 1576 thread->set_blocked_on_compilation(true); 1577 1578 methodHandle method(thread, task->method()); 1579 { 1580 MutexLocker waiter(task->lock(), thread); 1581 1582 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1583 task->lock()->wait(); 1584 } 1585 } 1586 1587 thread->set_blocked_on_compilation(false); 1588 if (is_compilation_disabled_forever()) { 1589 CompileTask::free(task); 1590 return; 1591 } 1592 1593 // It is harmless to check this status without the lock, because 1594 // completion is a stable property (until the task object is recycled). 1595 assert(task->is_complete(), "Compilation should have completed"); 1596 assert(task->code_handle() == NULL, "must be reset"); 1597 1598 // By convention, the waiter is responsible for recycling a 1599 // blocking CompileTask. Since there is only one waiter ever 1600 // waiting on a CompileTask, we know that no one else will 1601 // be using this CompileTask; we can free it. 1602 CompileTask::free(task); 1603 } 1604 1605 /** 1606 * Initialize compiler thread(s) + compiler object(s). The postcondition 1607 * of this function is that the compiler runtimes are initialized and that 1608 * compiler threads can start compiling. 1609 */ 1610 bool CompileBroker::init_compiler_runtime() { 1611 CompilerThread* thread = CompilerThread::current(); 1612 AbstractCompiler* comp = thread->compiler(); 1613 // Final sanity check - the compiler object must exist 1614 guarantee(comp != NULL, "Compiler object must exist"); 1615 1616 int system_dictionary_modification_counter; 1617 { 1618 MutexLocker locker(Compile_lock, thread); 1619 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1620 } 1621 1622 { 1623 // Must switch to native to allocate ci_env 1624 ThreadToNativeFromVM ttn(thread); 1625 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1626 // Cache Jvmti state 1627 ci_env.cache_jvmti_state(); 1628 // Cache DTrace flags 1629 ci_env.cache_dtrace_flags(); 1630 1631 // Switch back to VM state to do compiler initialization 1632 ThreadInVMfromNative tv(thread); 1633 ResetNoHandleMark rnhm; 1634 1635 1636 if (!comp->is_shark()) { 1637 // Perform per-thread and global initializations 1638 comp->initialize(); 1639 } 1640 } 1641 1642 if (comp->is_failed()) { 1643 disable_compilation_forever(); 1644 // If compiler initialization failed, no compiler thread that is specific to a 1645 // particular compiler runtime will ever start to compile methods. 1646 shutdown_compiler_runtime(comp, thread); 1647 return false; 1648 } 1649 1650 // C1 specific check 1651 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1652 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1653 return false; 1654 } 1655 1656 return true; 1657 } 1658 1659 /** 1660 * If C1 and/or C2 initialization failed, we shut down all compilation. 1661 * We do this to keep things simple. This can be changed if it ever turns 1662 * out to be a problem. 1663 */ 1664 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1665 // Free buffer blob, if allocated 1666 if (thread->get_buffer_blob() != NULL) { 1667 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1668 CodeCache::free(thread->get_buffer_blob()); 1669 } 1670 1671 if (comp->should_perform_shutdown()) { 1672 // There are two reasons for shutting down the compiler 1673 // 1) compiler runtime initialization failed 1674 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1675 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1676 1677 // Only one thread per compiler runtime object enters here 1678 // Set state to shut down 1679 comp->set_shut_down(); 1680 1681 // Delete all queued compilation tasks to make compiler threads exit faster. 1682 if (_c1_compile_queue != NULL) { 1683 _c1_compile_queue->free_all(); 1684 } 1685 1686 if (_c2_compile_queue != NULL) { 1687 _c2_compile_queue->free_all(); 1688 } 1689 1690 // Set flags so that we continue execution with using interpreter only. 1691 UseCompiler = false; 1692 UseInterpreter = true; 1693 1694 // We could delete compiler runtimes also. However, there are references to 1695 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1696 // fail. This can be done later if necessary. 1697 } 1698 } 1699 1700 // ------------------------------------------------------------------ 1701 // CompileBroker::compiler_thread_loop 1702 // 1703 // The main loop run by a CompilerThread. 1704 void CompileBroker::compiler_thread_loop() { 1705 CompilerThread* thread = CompilerThread::current(); 1706 CompileQueue* queue = thread->queue(); 1707 // For the thread that initializes the ciObjectFactory 1708 // this resource mark holds all the shared objects 1709 ResourceMark rm; 1710 1711 // First thread to get here will initialize the compiler interface 1712 1713 if (!ciObjectFactory::is_initialized()) { 1714 ASSERT_IN_VM; 1715 MutexLocker only_one (CompileThread_lock, thread); 1716 if (!ciObjectFactory::is_initialized()) { 1717 ciObjectFactory::initialize(); 1718 } 1719 } 1720 1721 // Open a log. 1722 if (LogCompilation) { 1723 init_compiler_thread_log(); 1724 } 1725 CompileLog* log = thread->log(); 1726 if (log != NULL) { 1727 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1728 thread->name(), 1729 os::current_thread_id(), 1730 os::current_process_id()); 1731 log->stamp(); 1732 log->end_elem(); 1733 } 1734 1735 // If compiler thread/runtime initialization fails, exit the compiler thread 1736 if (!init_compiler_runtime()) { 1737 return; 1738 } 1739 1740 // Poll for new compilation tasks as long as the JVM runs. Compilation 1741 // should only be disabled if something went wrong while initializing the 1742 // compiler runtimes. This, in turn, should not happen. The only known case 1743 // when compiler runtime initialization fails is if there is not enough free 1744 // space in the code cache to generate the necessary stubs, etc. 1745 while (!is_compilation_disabled_forever()) { 1746 // We need this HandleMark to avoid leaking VM handles. 1747 HandleMark hm(thread); 1748 1749 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1750 // the code cache is really full 1751 handle_full_code_cache(); 1752 } 1753 1754 CompileTask* task = queue->get(); 1755 if (task == NULL) { 1756 continue; 1757 } 1758 1759 // Give compiler threads an extra quanta. They tend to be bursty and 1760 // this helps the compiler to finish up the job. 1761 if( CompilerThreadHintNoPreempt ) 1762 os::hint_no_preempt(); 1763 1764 // trace per thread time and compile statistics 1765 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1766 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1767 1768 // Assign the task to the current thread. Mark this compilation 1769 // thread as active for the profiler. 1770 CompileTaskWrapper ctw(task); 1771 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1772 task->set_code_handle(&result_handle); 1773 methodHandle method(thread, task->method()); 1774 1775 // Never compile a method if breakpoints are present in it 1776 if (method()->number_of_breakpoints() == 0) { 1777 // Compile the method. 1778 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1779 #ifdef COMPILER1 1780 // Allow repeating compilations for the purpose of benchmarking 1781 // compile speed. This is not useful for customers. 1782 if (CompilationRepeat != 0) { 1783 int compile_count = CompilationRepeat; 1784 while (compile_count > 0) { 1785 invoke_compiler_on_method(task); 1786 nmethod* nm = method->code(); 1787 if (nm != NULL) { 1788 nm->make_zombie(); 1789 method->clear_code(); 1790 } 1791 compile_count--; 1792 } 1793 } 1794 #endif /* COMPILER1 */ 1795 invoke_compiler_on_method(task); 1796 } else { 1797 // After compilation is disabled, remove remaining methods from queue 1798 method->clear_queued_for_compilation(); 1799 task->set_failure_reason("compilation is disabled"); 1800 } 1801 } 1802 } 1803 1804 // Shut down compiler runtime 1805 shutdown_compiler_runtime(thread->compiler(), thread); 1806 } 1807 1808 // ------------------------------------------------------------------ 1809 // CompileBroker::init_compiler_thread_log 1810 // 1811 // Set up state required by +LogCompilation. 1812 void CompileBroker::init_compiler_thread_log() { 1813 CompilerThread* thread = CompilerThread::current(); 1814 char file_name[4*K]; 1815 FILE* fp = NULL; 1816 intx thread_id = os::current_thread_id(); 1817 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1818 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1819 if (dir == NULL) { 1820 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1821 thread_id, os::current_process_id()); 1822 } else { 1823 jio_snprintf(file_name, sizeof(file_name), 1824 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1825 os::file_separator(), thread_id, os::current_process_id()); 1826 } 1827 1828 fp = fopen(file_name, "at"); 1829 if (fp != NULL) { 1830 if (LogCompilation && Verbose) { 1831 tty->print_cr("Opening compilation log %s", file_name); 1832 } 1833 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1834 thread->init_log(log); 1835 1836 if (xtty != NULL) { 1837 ttyLocker ttyl; 1838 // Record any per thread log files 1839 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1840 } 1841 return; 1842 } 1843 } 1844 warning("Cannot open log file: %s", file_name); 1845 } 1846 1847 // ------------------------------------------------------------------ 1848 // CompileBroker::set_should_block 1849 // 1850 // Set _should_block. 1851 // Call this from the VM, with Threads_lock held and a safepoint requested. 1852 void CompileBroker::set_should_block() { 1853 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1854 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1855 #ifndef PRODUCT 1856 if (PrintCompilation && (Verbose || WizardMode)) 1857 tty->print_cr("notifying compiler thread pool to block"); 1858 #endif 1859 _should_block = true; 1860 } 1861 1862 // ------------------------------------------------------------------ 1863 // CompileBroker::maybe_block 1864 // 1865 // Call this from the compiler at convenient points, to poll for _should_block. 1866 void CompileBroker::maybe_block() { 1867 if (_should_block) { 1868 #ifndef PRODUCT 1869 if (PrintCompilation && (Verbose || WizardMode)) 1870 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1871 #endif 1872 ThreadInVMfromNative tivfn(JavaThread::current()); 1873 } 1874 } 1875 1876 // wrapper for CodeCache::print_summary() 1877 static void codecache_print(bool detailed) 1878 { 1879 ResourceMark rm; 1880 stringStream s; 1881 // Dump code cache into a buffer before locking the tty, 1882 { 1883 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1884 CodeCache::print_summary(&s, detailed); 1885 } 1886 ttyLocker ttyl; 1887 tty->print("%s", s.as_string()); 1888 } 1889 1890 // ------------------------------------------------------------------ 1891 // CompileBroker::invoke_compiler_on_method 1892 // 1893 // Compile a method. 1894 // 1895 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1896 if (PrintCompilation) { 1897 ResourceMark rm; 1898 task->print_tty(); 1899 } 1900 elapsedTimer time; 1901 1902 CompilerThread* thread = CompilerThread::current(); 1903 ResourceMark rm(thread); 1904 1905 if (LogEvents) { 1906 _compilation_log->log_compile(thread, task); 1907 } 1908 1909 // Common flags. 1910 uint compile_id = task->compile_id(); 1911 int osr_bci = task->osr_bci(); 1912 bool is_osr = (osr_bci != standard_entry_bci); 1913 bool should_log = (thread->log() != NULL); 1914 bool should_break = false; 1915 int task_level = task->comp_level(); 1916 { 1917 // create the handle inside it's own block so it can't 1918 // accidentally be referenced once the thread transitions to 1919 // native. The NoHandleMark before the transition should catch 1920 // any cases where this occurs in the future. 1921 methodHandle method(thread, task->method()); 1922 should_break = check_break_at(method, compile_id, is_osr); 1923 if (should_log && !CompilerOracle::should_log(method)) { 1924 should_log = false; 1925 } 1926 assert(!method->is_native(), "no longer compile natives"); 1927 1928 // Save information about this method in case of failure. 1929 set_last_compile(thread, method, is_osr, task_level); 1930 1931 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1932 } 1933 1934 // Allocate a new set of JNI handles. 1935 push_jni_handle_block(); 1936 Method* target_handle = task->method(); 1937 int compilable = ciEnv::MethodCompilable; 1938 { 1939 int system_dictionary_modification_counter; 1940 { 1941 MutexLocker locker(Compile_lock, thread); 1942 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1943 } 1944 1945 NoHandleMark nhm; 1946 ThreadToNativeFromVM ttn(thread); 1947 1948 ciEnv ci_env(task, system_dictionary_modification_counter); 1949 if (should_break) { 1950 ci_env.set_break_at_compile(true); 1951 } 1952 if (should_log) { 1953 ci_env.set_log(thread->log()); 1954 } 1955 assert(thread->env() == &ci_env, "set by ci_env"); 1956 // The thread-env() field is cleared in ~CompileTaskWrapper. 1957 1958 // Cache Jvmti state 1959 ci_env.cache_jvmti_state(); 1960 1961 // Cache DTrace flags 1962 ci_env.cache_dtrace_flags(); 1963 1964 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1965 1966 TraceTime t1("compilation", &time); 1967 EventCompilation event; 1968 1969 AbstractCompiler *comp = compiler(task_level); 1970 if (comp == NULL) { 1971 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1972 } else { 1973 comp->compile_method(&ci_env, target, osr_bci); 1974 } 1975 1976 if (!ci_env.failing() && task->code() == NULL) { 1977 //assert(false, "compiler should always document failure"); 1978 // The compiler elected, without comment, not to register a result. 1979 // Do not attempt further compilations of this method. 1980 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1981 } 1982 1983 // Copy this bit to the enclosing block: 1984 compilable = ci_env.compilable(); 1985 1986 if (ci_env.failing()) { 1987 task->set_failure_reason(ci_env.failure_reason()); 1988 const char* retry_message = ci_env.retry_message(); 1989 if (_compilation_log != NULL) { 1990 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1991 } 1992 if (PrintCompilation) { 1993 FormatBufferResource msg = retry_message != NULL ? 1994 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1995 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1996 task->print_compilation(tty, msg); 1997 } 1998 } else { 1999 task->mark_success(); 2000 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 2001 if (_compilation_log != NULL) { 2002 nmethod* code = task->code(); 2003 if (code != NULL) { 2004 _compilation_log->log_nmethod(thread, code); 2005 } 2006 } 2007 } 2008 // simulate crash during compilation 2009 assert(task->compile_id() != CICrashAt, "just as planned"); 2010 if (event.should_commit()) { 2011 event.set_method(target->get_Method()); 2012 event.set_compileID(compile_id); 2013 event.set_compileLevel(task->comp_level()); 2014 event.set_succeded(task->is_success()); 2015 event.set_isOsr(is_osr); 2016 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 2017 event.set_inlinedBytes(task->num_inlined_bytecodes()); 2018 event.commit(); 2019 } 2020 } 2021 pop_jni_handle_block(); 2022 2023 methodHandle method(thread, task->method()); 2024 2025 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2026 2027 collect_statistics(thread, time, task); 2028 2029 if (PrintCompilation && PrintCompilation2) { 2030 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2031 tty->print("%4d ", compile_id); // print compilation number 2032 tty->print("%s ", (is_osr ? "%" : " ")); 2033 if (task->code() != NULL) { 2034 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2035 } 2036 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2037 } 2038 2039 if (PrintCodeCacheOnCompilation) 2040 codecache_print(/* detailed= */ false); 2041 2042 // Disable compilation, if required. 2043 switch (compilable) { 2044 case ciEnv::MethodCompilable_never: 2045 if (is_osr) 2046 method->set_not_osr_compilable_quietly(); 2047 else 2048 method->set_not_compilable_quietly(); 2049 break; 2050 case ciEnv::MethodCompilable_not_at_tier: 2051 if (is_osr) 2052 method->set_not_osr_compilable_quietly(task_level); 2053 else 2054 method->set_not_compilable_quietly(task_level); 2055 break; 2056 } 2057 2058 // Note that the queued_for_compilation bits are cleared without 2059 // protection of a mutex. [They were set by the requester thread, 2060 // when adding the task to the compile queue -- at which time the 2061 // compile queue lock was held. Subsequently, we acquired the compile 2062 // queue lock to get this task off the compile queue; thus (to belabour 2063 // the point somewhat) our clearing of the bits must be occurring 2064 // only after the setting of the bits. See also 14012000 above. 2065 method->clear_queued_for_compilation(); 2066 2067 #ifdef ASSERT 2068 if (CollectedHeap::fired_fake_oom()) { 2069 // The current compile received a fake OOM during compilation so 2070 // go ahead and exit the VM since the test apparently succeeded 2071 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2072 vm_exit(0); 2073 } 2074 #endif 2075 } 2076 2077 /** 2078 * The CodeCache is full. Print out warning and disable compilation 2079 * or try code cache cleaning so compilation can continue later. 2080 */ 2081 void CompileBroker::handle_full_code_cache() { 2082 UseInterpreter = true; 2083 if (UseCompiler || AlwaysCompileLoopMethods ) { 2084 if (xtty != NULL) { 2085 ResourceMark rm; 2086 stringStream s; 2087 // Dump code cache state into a buffer before locking the tty, 2088 // because log_state() will use locks causing lock conflicts. 2089 CodeCache::log_state(&s); 2090 // Lock to prevent tearing 2091 ttyLocker ttyl; 2092 xtty->begin_elem("code_cache_full"); 2093 xtty->print("%s", s.as_string()); 2094 xtty->stamp(); 2095 xtty->end_elem(); 2096 } 2097 2098 CodeCache::report_codemem_full(); 2099 2100 #ifndef PRODUCT 2101 if (CompileTheWorld || ExitOnFullCodeCache) { 2102 codecache_print(/* detailed= */ true); 2103 before_exit(JavaThread::current()); 2104 exit_globals(); // will delete tty 2105 vm_direct_exit(CompileTheWorld ? 0 : 1); 2106 } 2107 #endif 2108 if (UseCodeCacheFlushing) { 2109 // Since code cache is full, immediately stop new compiles 2110 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2111 NMethodSweeper::log_sweep("disable_compiler"); 2112 } 2113 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2114 // without having to consider the state in which the current thread is. 2115 ThreadInVMfromUnknown in_vm; 2116 NMethodSweeper::possibly_sweep(); 2117 } else { 2118 disable_compilation_forever(); 2119 } 2120 2121 // Print warning only once 2122 if (should_print_compiler_warning()) { 2123 warning("CodeCache is full. Compiler has been disabled."); 2124 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2125 codecache_print(/* detailed= */ true); 2126 } 2127 } 2128 } 2129 2130 // ------------------------------------------------------------------ 2131 // CompileBroker::set_last_compile 2132 // 2133 // Record this compilation for debugging purposes. 2134 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2135 ResourceMark rm; 2136 char* method_name = method->name()->as_C_string(); 2137 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2138 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2139 char current_method[CompilerCounters::cmname_buffer_length]; 2140 size_t maxLen = CompilerCounters::cmname_buffer_length; 2141 2142 if (UsePerfData) { 2143 const char* class_name = method->method_holder()->name()->as_C_string(); 2144 2145 size_t s1len = strlen(class_name); 2146 size_t s2len = strlen(method_name); 2147 2148 // check if we need to truncate the string 2149 if (s1len + s2len + 2 > maxLen) { 2150 2151 // the strategy is to lop off the leading characters of the 2152 // class name and the trailing characters of the method name. 2153 2154 if (s2len + 2 > maxLen) { 2155 // lop of the entire class name string, let snprintf handle 2156 // truncation of the method name. 2157 class_name += s1len; // null string 2158 } 2159 else { 2160 // lop off the extra characters from the front of the class name 2161 class_name += ((s1len + s2len + 2) - maxLen); 2162 } 2163 } 2164 2165 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2166 } 2167 2168 if (CICountOSR && is_osr) { 2169 _last_compile_type = osr_compile; 2170 } else { 2171 _last_compile_type = normal_compile; 2172 } 2173 _last_compile_level = comp_level; 2174 2175 if (UsePerfData) { 2176 CompilerCounters* counters = thread->counters(); 2177 counters->set_current_method(current_method); 2178 counters->set_compile_type((jlong)_last_compile_type); 2179 } 2180 } 2181 2182 2183 // ------------------------------------------------------------------ 2184 // CompileBroker::push_jni_handle_block 2185 // 2186 // Push on a new block of JNI handles. 2187 void CompileBroker::push_jni_handle_block() { 2188 JavaThread* thread = JavaThread::current(); 2189 2190 // Allocate a new block for JNI handles. 2191 // Inlined code from jni_PushLocalFrame() 2192 JNIHandleBlock* java_handles = thread->active_handles(); 2193 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2194 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2195 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2196 thread->set_active_handles(compile_handles); 2197 } 2198 2199 2200 // ------------------------------------------------------------------ 2201 // CompileBroker::pop_jni_handle_block 2202 // 2203 // Pop off the current block of JNI handles. 2204 void CompileBroker::pop_jni_handle_block() { 2205 JavaThread* thread = JavaThread::current(); 2206 2207 // Release our JNI handle block 2208 JNIHandleBlock* compile_handles = thread->active_handles(); 2209 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2210 thread->set_active_handles(java_handles); 2211 compile_handles->set_pop_frame_link(NULL); 2212 JNIHandleBlock::release_block(compile_handles, thread); // may block 2213 } 2214 2215 2216 // ------------------------------------------------------------------ 2217 // CompileBroker::check_break_at 2218 // 2219 // Should the compilation break at the current compilation. 2220 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2221 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2222 return true; 2223 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2224 return true; 2225 } else { 2226 return (compile_id == CIBreakAt); 2227 } 2228 } 2229 2230 // ------------------------------------------------------------------ 2231 // CompileBroker::collect_statistics 2232 // 2233 // Collect statistics about the compilation. 2234 2235 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2236 bool success = task->is_success(); 2237 methodHandle method (thread, task->method()); 2238 uint compile_id = task->compile_id(); 2239 bool is_osr = (task->osr_bci() != standard_entry_bci); 2240 nmethod* code = task->code(); 2241 CompilerCounters* counters = thread->counters(); 2242 2243 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2244 MutexLocker locker(CompileStatistics_lock); 2245 2246 // _perf variables are production performance counters which are 2247 // updated regardless of the setting of the CITime and CITimeEach flags 2248 // 2249 if (!success) { 2250 _total_bailout_count++; 2251 if (UsePerfData) { 2252 _perf_last_failed_method->set_value(counters->current_method()); 2253 _perf_last_failed_type->set_value(counters->compile_type()); 2254 _perf_total_bailout_count->inc(); 2255 } 2256 } else if (code == NULL) { 2257 if (UsePerfData) { 2258 _perf_last_invalidated_method->set_value(counters->current_method()); 2259 _perf_last_invalidated_type->set_value(counters->compile_type()); 2260 _perf_total_invalidated_count->inc(); 2261 } 2262 _total_invalidated_count++; 2263 } else { 2264 // Compilation succeeded 2265 2266 // update compilation ticks - used by the implementation of 2267 // java.lang.management.CompilationMBean 2268 _perf_total_compilation->inc(time.ticks()); 2269 2270 _t_total_compilation.add(time); 2271 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2272 2273 if (CITime) { 2274 if (is_osr) { 2275 _t_osr_compilation.add(time); 2276 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2277 } else { 2278 _t_standard_compilation.add(time); 2279 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2280 } 2281 } 2282 2283 if (UsePerfData) { 2284 // save the name of the last method compiled 2285 _perf_last_method->set_value(counters->current_method()); 2286 _perf_last_compile_type->set_value(counters->compile_type()); 2287 _perf_last_compile_size->set_value(method->code_size() + 2288 task->num_inlined_bytecodes()); 2289 if (is_osr) { 2290 _perf_osr_compilation->inc(time.ticks()); 2291 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2292 } else { 2293 _perf_standard_compilation->inc(time.ticks()); 2294 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2295 } 2296 } 2297 2298 if (CITimeEach) { 2299 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2300 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2301 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2302 } 2303 2304 // Collect counts of successful compilations 2305 _sum_nmethod_size += code->total_size(); 2306 _sum_nmethod_code_size += code->insts_size(); 2307 _total_compile_count++; 2308 2309 if (UsePerfData) { 2310 _perf_sum_nmethod_size->inc( code->total_size()); 2311 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2312 _perf_total_compile_count->inc(); 2313 } 2314 2315 if (is_osr) { 2316 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2317 _total_osr_compile_count++; 2318 } else { 2319 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2320 _total_standard_compile_count++; 2321 } 2322 } 2323 // set the current method for the thread to null 2324 if (UsePerfData) counters->set_current_method(""); 2325 } 2326 2327 const char* CompileBroker::compiler_name(int comp_level) { 2328 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2329 if (comp == NULL) { 2330 return "no compiler"; 2331 } else { 2332 return (comp->name()); 2333 } 2334 } 2335 2336 void CompileBroker::print_times() { 2337 tty->cr(); 2338 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2339 tty->print_cr("------------------------------------------------"); 2340 //0000000000111111111122222222223333333333444444444455555555556666666666 2341 //0123456789012345678901234567890123456789012345678901234567890123456789 2342 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2343 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2344 CompileBroker::_t_standard_compilation.seconds(), 2345 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2346 tty->print_cr(" On stack replacement : %6.3f s, Average : %2.3f", CompileBroker::_t_osr_compilation.seconds(), CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count); 2347 2348 AbstractCompiler *comp = compiler(CompLevel_simple); 2349 if (comp != NULL) { 2350 comp->print_timers(); 2351 } 2352 comp = compiler(CompLevel_full_optimization); 2353 if (comp != NULL) { 2354 comp->print_timers(); 2355 } 2356 tty->cr(); 2357 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2358 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2359 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2360 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2361 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2362 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2363 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2364 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2365 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2366 tty->cr(); 2367 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2368 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2369 } 2370 2371 // Debugging output for failure 2372 void CompileBroker::print_last_compile() { 2373 if ( _last_compile_level != CompLevel_none && 2374 compiler(_last_compile_level) != NULL && 2375 _last_method_compiled != NULL && 2376 _last_compile_type != no_compile) { 2377 if (_last_compile_type == osr_compile) { 2378 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2379 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2380 } else { 2381 tty->print_cr("Last parse: %d+++(%d) %s", 2382 _compilation_id, _last_compile_level, _last_method_compiled); 2383 } 2384 } 2385 } 2386 2387 2388 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2389 #ifndef PRODUCT 2390 st->print_cr("Compiler thread printing unimplemented."); 2391 st->cr(); 2392 #endif 2393 }