compileBroker.cpp revision 6718:cefe56927aab
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 95bool CompileBroker::_initialized = false; 96volatile bool CompileBroker::_should_block = false; 97volatile jint CompileBroker::_print_compilation_warning = 0; 98volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 99 100// The installed compiler(s) 101AbstractCompiler* CompileBroker::_compilers[2]; 102 103// These counters are used to assign an unique ID to each compilation. 104volatile jint CompileBroker::_compilation_id = 0; 105volatile jint CompileBroker::_osr_compilation_id = 0; 106 107// Debugging information 108int CompileBroker::_last_compile_type = no_compile; 109int CompileBroker::_last_compile_level = CompLevel_none; 110char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 111 112// Performance counters 113PerfCounter* CompileBroker::_perf_total_compilation = NULL; 114PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 115PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 116 117PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 118PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 119PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 120PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 121PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 122 123PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 124PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 125PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 126PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 127 128PerfStringVariable* CompileBroker::_perf_last_method = NULL; 129PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 130PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 131PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 132PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 133PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 134PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 135 136// Timers and counters for generating statistics 137elapsedTimer CompileBroker::_t_total_compilation; 138elapsedTimer CompileBroker::_t_osr_compilation; 139elapsedTimer CompileBroker::_t_standard_compilation; 140 141int CompileBroker::_total_bailout_count = 0; 142int CompileBroker::_total_invalidated_count = 0; 143int CompileBroker::_total_compile_count = 0; 144int CompileBroker::_total_osr_compile_count = 0; 145int CompileBroker::_total_standard_compile_count = 0; 146 147int CompileBroker::_sum_osr_bytes_compiled = 0; 148int CompileBroker::_sum_standard_bytes_compiled = 0; 149int CompileBroker::_sum_nmethod_size = 0; 150int CompileBroker::_sum_nmethod_code_size = 0; 151 152long CompileBroker::_peak_compilation_time = 0; 153 154CompileQueue* CompileBroker::_c2_compile_queue = NULL; 155CompileQueue* CompileBroker::_c1_compile_queue = NULL; 156 157GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL; 158 159 160class 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); 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 190static CompilationLog* _compilation_log = NULL; 191 192void compileBroker_init() { 193 if (LogEvents) { 194 _compilation_log = new CompilationLog(); 195 } 196} 197 198CompileTaskWrapper::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 205CompileTaskWrapper::~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 228CompileTask* CompileTask::_task_free_list = NULL; 229#ifdef ASSERT 230int CompileTask::_num_allocated_tasks = 0; 231#endif 232/** 233 * Allocate a CompileTask, from the free list if possible. 234 */ 235CompileTask* 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 */ 259void 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 273void 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; 300 301 if (LogCompilation) { 302 _time_queued = os::elapsed_counter(); 303 if (hot_method.not_null()) { 304 if (hot_method == method) { 305 _hot_method = _method; 306 } else { 307 _hot_method = hot_method(); 308 // only add loader or mirror if different from _method_holder 309 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 310 } 311 } 312 } 313 314 _next = NULL; 315} 316 317// ------------------------------------------------------------------ 318// CompileTask::code/set_code 319nmethod* CompileTask::code() const { 320 if (_code_handle == NULL) return NULL; 321 return _code_handle->code(); 322} 323void CompileTask::set_code(nmethod* nm) { 324 if (_code_handle == NULL && nm == NULL) return; 325 guarantee(_code_handle != NULL, ""); 326 _code_handle->set_code(nm); 327 if (nm == NULL) _code_handle = NULL; // drop the handle also 328} 329 330 331void 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 341void CompileTask::print() { 342 tty->print("<CompileTask compile_id=%d ", _compile_id); 343 tty->print("method="); 344 _method->print_name(tty); 345 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>", 346 _osr_bci, bool_to_str(_is_blocking), 347 bool_to_str(_is_complete), bool_to_str(_is_success)); 348} 349 350 351// ------------------------------------------------------------------ 352// CompileTask::print_line_on_error 353// 354// This function is called by fatal error handler when the thread 355// causing troubles is a compiler thread. 356// 357// Do not grab any lock, do not allocate memory. 358// 359// Otherwise it's the same as CompileTask::print_line() 360// 361void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 362 // print compiler name 363 st->print("%s:", CompileBroker::compiler_name(comp_level())); 364 print_compilation(st); 365} 366 367// ------------------------------------------------------------------ 368// CompileTask::print_line 369void CompileTask::print_line() { 370 ttyLocker ttyl; // keep the following output all in one block 371 // print compiler name if requested 372 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 373 print_compilation(); 374} 375 376 377// ------------------------------------------------------------------ 378// CompileTask::print_compilation_impl 379void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 380 bool is_osr_method, int osr_bci, bool is_blocking, 381 const char* msg, bool short_form) { 382 if (!short_form) { 383 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 384 } 385 st->print("%4d ", compile_id); // print compilation number 386 387 // For unloaded methods the transition to zombie occurs after the 388 // method is cleared so it's impossible to report accurate 389 // information for that case. 390 bool is_synchronized = false; 391 bool has_exception_handler = false; 392 bool is_native = false; 393 if (method != NULL) { 394 is_synchronized = method->is_synchronized(); 395 has_exception_handler = method->has_exception_handler(); 396 is_native = method->is_native(); 397 } 398 // method attributes 399 const char compile_type = is_osr_method ? '%' : ' '; 400 const char sync_char = is_synchronized ? 's' : ' '; 401 const char exception_char = has_exception_handler ? '!' : ' '; 402 const char blocking_char = is_blocking ? 'b' : ' '; 403 const char native_char = is_native ? 'n' : ' '; 404 405 // print method attributes 406 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 407 408 if (TieredCompilation) { 409 if (comp_level != -1) st->print("%d ", comp_level); 410 else st->print("- "); 411 } 412 st->print(" "); // more indent 413 414 if (method == NULL) { 415 st->print("(method)"); 416 } else { 417 method->print_short_name(st); 418 if (is_osr_method) { 419 st->print(" @ %d", osr_bci); 420 } 421 if (method->is_native()) 422 st->print(" (native)"); 423 else 424 st->print(" (%d bytes)", method->code_size()); 425 } 426 427 if (msg != NULL) { 428 st->print(" %s", msg); 429 } 430 if (!short_form) { 431 st->cr(); 432 } 433} 434 435// ------------------------------------------------------------------ 436// CompileTask::print_inlining 437void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 438 // 1234567 439 st->print(" "); // print timestamp 440 // 1234 441 st->print(" "); // print compilation number 442 443 // method attributes 444 if (method->is_loaded()) { 445 const char sync_char = method->is_synchronized() ? 's' : ' '; 446 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 447 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 448 449 // print method attributes 450 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 451 } else { 452 // %s!bn 453 st->print(" "); // print method attributes 454 } 455 456 if (TieredCompilation) { 457 st->print(" "); 458 } 459 st->print(" "); // more indent 460 st->print(" "); // initial inlining indent 461 462 for (int i = 0; i < inline_level; i++) st->print(" "); 463 464 st->print("@ %d ", bci); // print bci 465 method->print_short_name(st); 466 if (method->is_loaded()) 467 st->print(" (%d bytes)", method->code_size()); 468 else 469 st->print(" (not loaded)"); 470 471 if (msg != NULL) { 472 st->print(" %s", msg); 473 } 474 st->cr(); 475} 476 477// ------------------------------------------------------------------ 478// CompileTask::print_inline_indent 479void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 480 // 1234567 481 st->print(" "); // print timestamp 482 // 1234 483 st->print(" "); // print compilation number 484 // %s!bn 485 st->print(" "); // print method attributes 486 if (TieredCompilation) { 487 st->print(" "); 488 } 489 st->print(" "); // more indent 490 st->print(" "); // initial inlining indent 491 for (int i = 0; i < inline_level; i++) st->print(" "); 492} 493 494// ------------------------------------------------------------------ 495// CompileTask::print_compilation 496void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) { 497 bool is_osr_method = osr_bci() != InvocationEntryBci; 498 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form); 499} 500 501// ------------------------------------------------------------------ 502// CompileTask::log_task 503void CompileTask::log_task(xmlStream* log) { 504 Thread* thread = Thread::current(); 505 methodHandle method(thread, this->method()); 506 ResourceMark rm(thread); 507 508 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 509 log->print(" compile_id='%d'", _compile_id); 510 if (_osr_bci != CompileBroker::standard_entry_bci) { 511 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 512 } // else compile_kind='c2c' 513 if (!method.is_null()) log->method(method); 514 if (_osr_bci != CompileBroker::standard_entry_bci) { 515 log->print(" osr_bci='%d'", _osr_bci); 516 } 517 if (_comp_level != CompLevel_highest_tier) { 518 log->print(" level='%d'", _comp_level); 519 } 520 if (_is_blocking) { 521 log->print(" blocking='1'"); 522 } 523 log->stamp(); 524} 525 526 527// ------------------------------------------------------------------ 528// CompileTask::log_task_queued 529void CompileTask::log_task_queued() { 530 Thread* thread = Thread::current(); 531 ttyLocker ttyl; 532 ResourceMark rm(thread); 533 534 xtty->begin_elem("task_queued"); 535 log_task(xtty); 536 if (_comment != NULL) { 537 xtty->print(" comment='%s'", _comment); 538 } 539 if (_hot_method != NULL) { 540 methodHandle hot(thread, _hot_method); 541 methodHandle method(thread, _method); 542 if (hot() != method()) { 543 xtty->method(hot); 544 } 545 } 546 if (_hot_count != 0) { 547 xtty->print(" hot_count='%d'", _hot_count); 548 } 549 xtty->end_elem(); 550} 551 552 553// ------------------------------------------------------------------ 554// CompileTask::log_task_start 555void CompileTask::log_task_start(CompileLog* log) { 556 log->begin_head("task"); 557 log_task(log); 558 log->end_head(); 559} 560 561 562// ------------------------------------------------------------------ 563// CompileTask::log_task_done 564void CompileTask::log_task_done(CompileLog* log) { 565 Thread* thread = Thread::current(); 566 methodHandle method(thread, this->method()); 567 ResourceMark rm(thread); 568 569 // <task_done ... stamp='1.234'> </task> 570 nmethod* nm = code(); 571 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 572 _is_success, nm == NULL ? 0 : nm->content_size(), 573 method->invocation_count()); 574 int bec = method->backedge_count(); 575 if (bec != 0) log->print(" backedge_count='%d'", bec); 576 // Note: "_is_complete" is about to be set, but is not. 577 if (_num_inlined_bytecodes != 0) { 578 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 579 } 580 log->stamp(); 581 log->end_elem(); 582 log->tail("task"); 583 log->clear_identities(); // next task will have different CI 584 if (log->unflushed_count() > 2000) { 585 log->flush(); 586 } 587 log->mark_file_end(); 588} 589 590 591 592/** 593 * Add a CompileTask to a CompileQueue. 594 */ 595void CompileQueue::add(CompileTask* task) { 596 assert(lock()->owned_by_self(), "must own lock"); 597 598 task->set_next(NULL); 599 task->set_prev(NULL); 600 601 if (_last == NULL) { 602 // The compile queue is empty. 603 assert(_first == NULL, "queue is empty"); 604 _first = task; 605 _last = task; 606 } else { 607 // Append the task to the queue. 608 assert(_last->next() == NULL, "not last"); 609 _last->set_next(task); 610 task->set_prev(_last); 611 _last = task; 612 } 613 ++_size; 614 615 // Mark the method as being in the compile queue. 616 task->method()->set_queued_for_compilation(); 617 618 NOT_PRODUCT(print();) 619 620 if (LogCompilation && xtty != NULL) { 621 task->log_task_queued(); 622 } 623 624 // Notify CompilerThreads that a task is available. 625 lock()->notify_all(); 626} 627 628/** 629 * Empties compilation queue by putting all compilation tasks onto 630 * a freelist. Furthermore, the method wakes up all threads that are 631 * waiting on a compilation task to finish. This can happen if background 632 * compilation is disabled. 633 */ 634void CompileQueue::free_all() { 635 MutexLocker mu(lock()); 636 CompileTask* next = _first; 637 638 // Iterate over all tasks in the compile queue 639 while (next != NULL) { 640 CompileTask* current = next; 641 next = current->next(); 642 { 643 // Wake up thread that blocks on the compile task. 644 MutexLocker ct_lock(current->lock()); 645 current->lock()->notify(); 646 } 647 // Put the task back on the freelist. 648 CompileTask::free(current); 649 } 650 _first = NULL; 651 652 // Wake up all threads that block on the queue. 653 lock()->notify_all(); 654} 655 656// ------------------------------------------------------------------ 657// CompileQueue::get 658// 659// Get the next CompileTask from a CompileQueue 660CompileTask* CompileQueue::get() { 661 NMethodSweeper::possibly_sweep(); 662 663 MutexLocker locker(lock()); 664 // If _first is NULL we have no more compile jobs. There are two reasons for 665 // having no compile jobs: First, we compiled everything we wanted. Second, 666 // we ran out of code cache so compilation has been disabled. In the latter 667 // case we perform code cache sweeps to free memory such that we can re-enable 668 // compilation. 669 while (_first == NULL) { 670 // Exit loop if compilation is disabled forever 671 if (CompileBroker::is_compilation_disabled_forever()) { 672 return NULL; 673 } 674 675 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 676 // Wait a certain amount of time to possibly do another sweep. 677 // We must wait until stack scanning has happened so that we can 678 // transition a method's state from 'not_entrant' to 'zombie'. 679 long wait_time = NmethodSweepCheckInterval * 1000; 680 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 681 // Only one thread at a time can do sweeping. Scale the 682 // wait time according to the number of compiler threads. 683 // As a result, the next sweep is likely to happen every 100ms 684 // with an arbitrary number of threads that do sweeping. 685 wait_time = 100 * CICompilerCount; 686 } 687 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 688 if (timeout) { 689 MutexUnlocker ul(lock()); 690 NMethodSweeper::possibly_sweep(); 691 } 692 } else { 693 // If there are no compilation tasks and we can compile new jobs 694 // (i.e., there is enough free space in the code cache) there is 695 // no need to invoke the sweeper. As a result, the hotness of methods 696 // remains unchanged. This behavior is desired, since we want to keep 697 // the stable state, i.e., we do not want to evict methods from the 698 // code cache if it is unnecessary. 699 // We need a timed wait here, since compiler threads can exit if compilation 700 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 701 // is not critical and we do not want idle compiler threads to wake up too often. 702 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 703 } 704 } 705 706 if (CompileBroker::is_compilation_disabled_forever()) { 707 return NULL; 708 } 709 710 CompileTask* task; 711 { 712 No_Safepoint_Verifier nsv; 713 task = CompilationPolicy::policy()->select_task(this); 714 } 715 remove(task); 716 purge_stale_tasks(); // may temporarily release MCQ lock 717 return task; 718} 719 720// Clean & deallocate stale compile tasks. 721// Temporarily releases MethodCompileQueue lock. 722void CompileQueue::purge_stale_tasks() { 723 assert(lock()->owned_by_self(), "must own lock"); 724 if (_first_stale != NULL) { 725 // Stale tasks are purged when MCQ lock is released, 726 // but _first_stale updates are protected by MCQ lock. 727 // Once task processing starts and MCQ lock is released, 728 // other compiler threads can reuse _first_stale. 729 CompileTask* head = _first_stale; 730 _first_stale = NULL; 731 { 732 MutexUnlocker ul(lock()); 733 for (CompileTask* task = head; task != NULL; ) { 734 CompileTask* next_task = task->next(); 735 CompileTaskWrapper ctw(task); // Frees the task 736 task = next_task; 737 } 738 } 739 } 740} 741 742void CompileQueue::remove(CompileTask* task) { 743 assert(lock()->owned_by_self(), "must own lock"); 744 if (task->prev() != NULL) { 745 task->prev()->set_next(task->next()); 746 } else { 747 // max is the first element 748 assert(task == _first, "Sanity"); 749 _first = task->next(); 750 } 751 752 if (task->next() != NULL) { 753 task->next()->set_prev(task->prev()); 754 } else { 755 // max is the last element 756 assert(task == _last, "Sanity"); 757 _last = task->prev(); 758 } 759 --_size; 760} 761 762void CompileQueue::remove_and_mark_stale(CompileTask* task) { 763 assert(lock()->owned_by_self(), "must own lock"); 764 remove(task); 765 766 // Enqueue the task for reclamation (should be done outside MCQ lock) 767 task->set_next(_first_stale); 768 task->set_prev(NULL); 769 _first_stale = task; 770} 771 772// methods in the compile queue need to be marked as used on the stack 773// so that they don't get reclaimed by Redefine Classes 774void CompileQueue::mark_on_stack() { 775 CompileTask* task = _first; 776 while (task != NULL) { 777 task->mark_on_stack(); 778 task = task->next(); 779 } 780} 781 782#ifndef PRODUCT 783/** 784 * Print entire compilation queue. 785 */ 786void CompileQueue::print() { 787 if (CIPrintCompileQueue) { 788 ttyLocker ttyl; 789 tty->print_cr("Contents of %s", name()); 790 tty->print_cr("----------------------"); 791 CompileTask* task = _first; 792 while (task != NULL) { 793 task->print_line(); 794 task = task->next(); 795 } 796 tty->print_cr("----------------------"); 797 } 798} 799#endif // PRODUCT 800 801CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 802 803 _current_method[0] = '\0'; 804 _compile_type = CompileBroker::no_compile; 805 806 if (UsePerfData) { 807 ResourceMark rm; 808 809 // create the thread instance name space string - don't create an 810 // instance subspace if instance is -1 - keeps the adapterThread 811 // counters from having a ".0" namespace. 812 const char* thread_i = (instance == -1) ? thread_name : 813 PerfDataManager::name_space(thread_name, instance); 814 815 816 char* name = PerfDataManager::counter_name(thread_i, "method"); 817 _perf_current_method = 818 PerfDataManager::create_string_variable(SUN_CI, name, 819 cmname_buffer_length, 820 _current_method, CHECK); 821 822 name = PerfDataManager::counter_name(thread_i, "type"); 823 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 824 PerfData::U_None, 825 (jlong)_compile_type, 826 CHECK); 827 828 name = PerfDataManager::counter_name(thread_i, "time"); 829 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 830 PerfData::U_Ticks, CHECK); 831 832 name = PerfDataManager::counter_name(thread_i, "compiles"); 833 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 834 PerfData::U_Events, CHECK); 835 } 836} 837 838// ------------------------------------------------------------------ 839// CompileBroker::compilation_init 840// 841// Initialize the Compilation object 842void CompileBroker::compilation_init() { 843 _last_method_compiled[0] = '\0'; 844 845 // No need to initialize compilation system if we do not use it. 846 if (!UseCompiler) { 847 return; 848 } 849#ifndef SHARK 850 // Set the interface to the current compiler(s). 851 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 852 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 853#ifdef COMPILER1 854 if (c1_count > 0) { 855 _compilers[0] = new Compiler(); 856 } 857#endif // COMPILER1 858 859#ifdef COMPILER2 860 if (c2_count > 0) { 861 _compilers[1] = new C2Compiler(); 862 } 863#endif // COMPILER2 864 865#else // SHARK 866 int c1_count = 0; 867 int c2_count = 1; 868 869 _compilers[1] = new SharkCompiler(); 870#endif // SHARK 871 872 // Start the CompilerThreads 873 init_compiler_threads(c1_count, c2_count); 874 // totalTime performance counter is always created as it is required 875 // by the implementation of java.lang.management.CompilationMBean. 876 { 877 EXCEPTION_MARK; 878 _perf_total_compilation = 879 PerfDataManager::create_counter(JAVA_CI, "totalTime", 880 PerfData::U_Ticks, CHECK); 881 } 882 883 884 if (UsePerfData) { 885 886 EXCEPTION_MARK; 887 888 // create the jvmstat performance counters 889 _perf_osr_compilation = 890 PerfDataManager::create_counter(SUN_CI, "osrTime", 891 PerfData::U_Ticks, CHECK); 892 893 _perf_standard_compilation = 894 PerfDataManager::create_counter(SUN_CI, "standardTime", 895 PerfData::U_Ticks, CHECK); 896 897 _perf_total_bailout_count = 898 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 899 PerfData::U_Events, CHECK); 900 901 _perf_total_invalidated_count = 902 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 903 PerfData::U_Events, CHECK); 904 905 _perf_total_compile_count = 906 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 907 PerfData::U_Events, CHECK); 908 _perf_total_osr_compile_count = 909 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 910 PerfData::U_Events, CHECK); 911 912 _perf_total_standard_compile_count = 913 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 914 PerfData::U_Events, CHECK); 915 916 _perf_sum_osr_bytes_compiled = 917 PerfDataManager::create_counter(SUN_CI, "osrBytes", 918 PerfData::U_Bytes, CHECK); 919 920 _perf_sum_standard_bytes_compiled = 921 PerfDataManager::create_counter(SUN_CI, "standardBytes", 922 PerfData::U_Bytes, CHECK); 923 924 _perf_sum_nmethod_size = 925 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 926 PerfData::U_Bytes, CHECK); 927 928 _perf_sum_nmethod_code_size = 929 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 930 PerfData::U_Bytes, CHECK); 931 932 _perf_last_method = 933 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 934 CompilerCounters::cmname_buffer_length, 935 "", CHECK); 936 937 _perf_last_failed_method = 938 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 939 CompilerCounters::cmname_buffer_length, 940 "", CHECK); 941 942 _perf_last_invalidated_method = 943 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 944 CompilerCounters::cmname_buffer_length, 945 "", CHECK); 946 947 _perf_last_compile_type = 948 PerfDataManager::create_variable(SUN_CI, "lastType", 949 PerfData::U_None, 950 (jlong)CompileBroker::no_compile, 951 CHECK); 952 953 _perf_last_compile_size = 954 PerfDataManager::create_variable(SUN_CI, "lastSize", 955 PerfData::U_Bytes, 956 (jlong)CompileBroker::no_compile, 957 CHECK); 958 959 960 _perf_last_failed_type = 961 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 962 PerfData::U_None, 963 (jlong)CompileBroker::no_compile, 964 CHECK); 965 966 _perf_last_invalidated_type = 967 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 968 PerfData::U_None, 969 (jlong)CompileBroker::no_compile, 970 CHECK); 971 } 972 973 _initialized = true; 974} 975 976 977CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 978 AbstractCompiler* comp, TRAPS) { 979 CompilerThread* compiler_thread = NULL; 980 981 Klass* k = 982 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 983 true, CHECK_0); 984 instanceKlassHandle klass (THREAD, k); 985 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 986 Handle string = java_lang_String::create_from_str(name, CHECK_0); 987 988 // Initialize thread_oop to put it into the system threadGroup 989 Handle thread_group (THREAD, Universe::system_thread_group()); 990 JavaValue result(T_VOID); 991 JavaCalls::call_special(&result, thread_oop, 992 klass, 993 vmSymbols::object_initializer_name(), 994 vmSymbols::threadgroup_string_void_signature(), 995 thread_group, 996 string, 997 CHECK_0); 998 999 { 1000 MutexLocker mu(Threads_lock, THREAD); 1001 compiler_thread = new CompilerThread(queue, counters); 1002 // At this point the new CompilerThread data-races with this startup 1003 // thread (which I believe is the primoridal thread and NOT the VM 1004 // thread). This means Java bytecodes being executed at startup can 1005 // queue compile jobs which will run at whatever default priority the 1006 // newly created CompilerThread runs at. 1007 1008 1009 // At this point it may be possible that no osthread was created for the 1010 // JavaThread due to lack of memory. We would have to throw an exception 1011 // in that case. However, since this must work and we do not allow 1012 // exceptions anyway, check and abort if this fails. 1013 1014 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 1015 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1016 os::native_thread_creation_failed_msg()); 1017 } 1018 1019 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 1020 1021 // Note that this only sets the JavaThread _priority field, which by 1022 // definition is limited to Java priorities and not OS priorities. 1023 // The os-priority is set in the CompilerThread startup code itself 1024 1025 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1026 1027 // Note that we cannot call os::set_priority because it expects Java 1028 // priorities and we are *explicitly* using OS priorities so that it's 1029 // possible to set the compiler thread priority higher than any Java 1030 // thread. 1031 1032 int native_prio = CompilerThreadPriority; 1033 if (native_prio == -1) { 1034 if (UseCriticalCompilerThreadPriority) { 1035 native_prio = os::java_to_os_priority[CriticalPriority]; 1036 } else { 1037 native_prio = os::java_to_os_priority[NearMaxPriority]; 1038 } 1039 } 1040 os::set_native_priority(compiler_thread, native_prio); 1041 1042 java_lang_Thread::set_daemon(thread_oop()); 1043 1044 compiler_thread->set_threadObj(thread_oop()); 1045 compiler_thread->set_compiler(comp); 1046 Threads::add(compiler_thread); 1047 Thread::start(compiler_thread); 1048 } 1049 1050 // Let go of Threads_lock before yielding 1051 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1052 1053 return compiler_thread; 1054} 1055 1056 1057void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 1058 EXCEPTION_MARK; 1059#if !defined(ZERO) && !defined(SHARK) 1060 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1061#endif // !ZERO && !SHARK 1062 // Initialize the compilation queue 1063 if (c2_compiler_count > 0) { 1064 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock); 1065 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1066 } 1067 if (c1_compiler_count > 0) { 1068 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock); 1069 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1070 } 1071 1072 int compiler_count = c1_compiler_count + c2_compiler_count; 1073 1074 _compiler_threads = 1075 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1076 1077 char name_buffer[256]; 1078 for (int i = 0; i < c2_compiler_count; i++) { 1079 // Create a name for our thread. 1080 sprintf(name_buffer, "C2 CompilerThread%d", i); 1081 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1082 // Shark and C2 1083 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK); 1084 _compiler_threads->append(new_thread); 1085 } 1086 1087 for (int i = c2_compiler_count; i < compiler_count; i++) { 1088 // Create a name for our thread. 1089 sprintf(name_buffer, "C1 CompilerThread%d", i); 1090 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1091 // C1 1092 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK); 1093 _compiler_threads->append(new_thread); 1094 } 1095 1096 if (UsePerfData) { 1097 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1098 } 1099} 1100 1101 1102/** 1103 * Set the methods on the stack as on_stack so that redefine classes doesn't 1104 * reclaim them. This method is executed at a safepoint. 1105 */ 1106void CompileBroker::mark_on_stack() { 1107 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1108 // Since we are at a safepoint, we do not need a lock to access 1109 // the compile queues. 1110 if (_c2_compile_queue != NULL) { 1111 _c2_compile_queue->mark_on_stack(); 1112 } 1113 if (_c1_compile_queue != NULL) { 1114 _c1_compile_queue->mark_on_stack(); 1115 } 1116} 1117 1118// ------------------------------------------------------------------ 1119// CompileBroker::compile_method 1120// 1121// Request compilation of a method. 1122void CompileBroker::compile_method_base(methodHandle method, 1123 int osr_bci, 1124 int comp_level, 1125 methodHandle hot_method, 1126 int hot_count, 1127 const char* comment, 1128 Thread* thread) { 1129 // do nothing if compiler thread(s) is not available 1130 if (!_initialized) { 1131 return; 1132 } 1133 1134 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1135 assert(method->method_holder()->oop_is_instance(), 1136 "sanity check"); 1137 assert(!method->method_holder()->is_not_initialized(), 1138 "method holder must be initialized"); 1139 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1140 1141 if (CIPrintRequests) { 1142 tty->print("request: "); 1143 method->print_short_name(tty); 1144 if (osr_bci != InvocationEntryBci) { 1145 tty->print(" osr_bci: %d", osr_bci); 1146 } 1147 tty->print(" comment: %s count: %d", comment, hot_count); 1148 if (!hot_method.is_null()) { 1149 tty->print(" hot: "); 1150 if (hot_method() != method()) { 1151 hot_method->print_short_name(tty); 1152 } else { 1153 tty->print("yes"); 1154 } 1155 } 1156 tty->cr(); 1157 } 1158 1159 // A request has been made for compilation. Before we do any 1160 // real work, check to see if the method has been compiled 1161 // in the meantime with a definitive result. 1162 if (compilation_is_complete(method, osr_bci, comp_level)) { 1163 return; 1164 } 1165 1166#ifndef PRODUCT 1167 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1168 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1169 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1170 return; 1171 } 1172 } 1173#endif 1174 1175 // If this method is already in the compile queue, then 1176 // we do not block the current thread. 1177 if (compilation_is_in_queue(method)) { 1178 // We may want to decay our counter a bit here to prevent 1179 // multiple denied requests for compilation. This is an 1180 // open compilation policy issue. Note: The other possibility, 1181 // in the case that this is a blocking compile request, is to have 1182 // all subsequent blocking requesters wait for completion of 1183 // ongoing compiles. Note that in this case we'll need a protocol 1184 // for freeing the associated compile tasks. [Or we could have 1185 // a single static monitor on which all these waiters sleep.] 1186 return; 1187 } 1188 1189 // If the requesting thread is holding the pending list lock 1190 // then we just return. We can't risk blocking while holding 1191 // the pending list lock or a 3-way deadlock may occur 1192 // between the reference handler thread, a GC (instigated 1193 // by a compiler thread), and compiled method registration. 1194 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1195 return; 1196 } 1197 1198 // Outputs from the following MutexLocker block: 1199 CompileTask* task = NULL; 1200 bool blocking = false; 1201 CompileQueue* queue = compile_queue(comp_level); 1202 1203 // Acquire our lock. 1204 { 1205 MutexLocker locker(queue->lock(), thread); 1206 1207 // Make sure the method has not slipped into the queues since 1208 // last we checked; note that those checks were "fast bail-outs". 1209 // Here we need to be more careful, see 14012000 below. 1210 if (compilation_is_in_queue(method)) { 1211 return; 1212 } 1213 1214 // We need to check again to see if the compilation has 1215 // completed. A previous compilation may have registered 1216 // some result. 1217 if (compilation_is_complete(method, osr_bci, comp_level)) { 1218 return; 1219 } 1220 1221 // We now know that this compilation is not pending, complete, 1222 // or prohibited. Assign a compile_id to this compilation 1223 // and check to see if it is in our [Start..Stop) range. 1224 int compile_id = assign_compile_id(method, osr_bci); 1225 if (compile_id == 0) { 1226 // The compilation falls outside the allowed range. 1227 return; 1228 } 1229 1230 // Should this thread wait for completion of the compile? 1231 blocking = is_compile_blocking(); 1232 1233 // We will enter the compilation in the queue. 1234 // 14012000: Note that this sets the queued_for_compile bits in 1235 // the target method. We can now reason that a method cannot be 1236 // queued for compilation more than once, as follows: 1237 // Before a thread queues a task for compilation, it first acquires 1238 // the compile queue lock, then checks if the method's queued bits 1239 // are set or it has already been compiled. Thus there can not be two 1240 // instances of a compilation task for the same method on the 1241 // compilation queue. Consider now the case where the compilation 1242 // thread has already removed a task for that method from the queue 1243 // and is in the midst of compiling it. In this case, the 1244 // queued_for_compile bits must be set in the method (and these 1245 // will be visible to the current thread, since the bits were set 1246 // under protection of the compile queue lock, which we hold now. 1247 // When the compilation completes, the compiler thread first sets 1248 // the compilation result and then clears the queued_for_compile 1249 // bits. Neither of these actions are protected by a barrier (or done 1250 // under the protection of a lock), so the only guarantee we have 1251 // (on machines with TSO (Total Store Order)) is that these values 1252 // will update in that order. As a result, the only combinations of 1253 // these bits that the current thread will see are, in temporal order: 1254 // <RESULT, QUEUE> : 1255 // <0, 1> : in compile queue, but not yet compiled 1256 // <1, 1> : compiled but queue bit not cleared 1257 // <1, 0> : compiled and queue bit cleared 1258 // Because we first check the queue bits then check the result bits, 1259 // we are assured that we cannot introduce a duplicate task. 1260 // Note that if we did the tests in the reverse order (i.e. check 1261 // result then check queued bit), we could get the result bit before 1262 // the compilation completed, and the queue bit after the compilation 1263 // completed, and end up introducing a "duplicate" (redundant) task. 1264 // In that case, the compiler thread should first check if a method 1265 // has already been compiled before trying to compile it. 1266 // NOTE: in the event that there are multiple compiler threads and 1267 // there is de-optimization/recompilation, things will get hairy, 1268 // and in that case it's best to protect both the testing (here) of 1269 // these bits, and their updating (here and elsewhere) under a 1270 // common lock. 1271 task = create_compile_task(queue, 1272 compile_id, method, 1273 osr_bci, comp_level, 1274 hot_method, hot_count, comment, 1275 blocking); 1276 } 1277 1278 if (blocking) { 1279 wait_for_completion(task); 1280 } 1281} 1282 1283 1284nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1285 int comp_level, 1286 methodHandle hot_method, int hot_count, 1287 const char* comment, Thread* THREAD) { 1288 // make sure arguments make sense 1289 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1290 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1291 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1292 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1293 // allow any levels for WhiteBox 1294 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1295 // return quickly if possible 1296 1297 // lock, make sure that the compilation 1298 // isn't prohibited in a straightforward way. 1299 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1300 if (comp == NULL || !comp->can_compile_method(method) || 1301 compilation_is_prohibited(method, osr_bci, comp_level)) { 1302 return NULL; 1303 } 1304 1305 if (osr_bci == InvocationEntryBci) { 1306 // standard compilation 1307 nmethod* method_code = method->code(); 1308 if (method_code != NULL) { 1309 if (compilation_is_complete(method, osr_bci, comp_level)) { 1310 return method_code; 1311 } 1312 } 1313 if (method->is_not_compilable(comp_level)) { 1314 return NULL; 1315 } 1316 } else { 1317 // osr compilation 1318#ifndef TIERED 1319 // seems like an assert of dubious value 1320 assert(comp_level == CompLevel_highest_tier, 1321 "all OSR compiles are assumed to be at a single compilation lavel"); 1322#endif // TIERED 1323 // We accept a higher level osr method 1324 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1325 if (nm != NULL) return nm; 1326 if (method->is_not_osr_compilable(comp_level)) return NULL; 1327 } 1328 1329 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1330 // some prerequisites that are compiler specific 1331 if (comp->is_c2() || comp->is_shark()) { 1332 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1333 // Resolve all classes seen in the signature of the method 1334 // we are compiling. 1335 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1336 } 1337 1338 // If the method is native, do the lookup in the thread requesting 1339 // the compilation. Native lookups can load code, which is not 1340 // permitted during compilation. 1341 // 1342 // Note: A native method implies non-osr compilation which is 1343 // checked with an assertion at the entry of this method. 1344 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1345 bool in_base_library; 1346 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1347 if (HAS_PENDING_EXCEPTION) { 1348 // In case of an exception looking up the method, we just forget 1349 // about it. The interpreter will kick-in and throw the exception. 1350 method->set_not_compilable(); // implies is_not_osr_compilable() 1351 CLEAR_PENDING_EXCEPTION; 1352 return NULL; 1353 } 1354 assert(method->has_native_function(), "must have native code by now"); 1355 } 1356 1357 // RedefineClasses() has replaced this method; just return 1358 if (method->is_old()) { 1359 return NULL; 1360 } 1361 1362 // JVMTI -- post_compile_event requires jmethod_id() that may require 1363 // a lock the compiling thread can not acquire. Prefetch it here. 1364 if (JvmtiExport::should_post_compiled_method_load()) { 1365 method->jmethod_id(); 1366 } 1367 1368 // do the compilation 1369 if (method->is_native()) { 1370 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1371 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1372 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1373 // 1374 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1375 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1376 AdapterHandlerLibrary::create_native_wrapper(method); 1377 } else { 1378 return NULL; 1379 } 1380 } else { 1381 // If the compiler is shut off due to code cache getting full 1382 // fail out now so blocking compiles dont hang the java thread 1383 if (!should_compile_new_jobs()) { 1384 CompilationPolicy::policy()->delay_compilation(method()); 1385 return NULL; 1386 } 1387 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1388 } 1389 1390 // return requested nmethod 1391 // We accept a higher level osr method 1392 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1393} 1394 1395 1396// ------------------------------------------------------------------ 1397// CompileBroker::compilation_is_complete 1398// 1399// See if compilation of this method is already complete. 1400bool CompileBroker::compilation_is_complete(methodHandle method, 1401 int osr_bci, 1402 int comp_level) { 1403 bool is_osr = (osr_bci != standard_entry_bci); 1404 if (is_osr) { 1405 if (method->is_not_osr_compilable(comp_level)) { 1406 return true; 1407 } else { 1408 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1409 return (result != NULL); 1410 } 1411 } else { 1412 if (method->is_not_compilable(comp_level)) { 1413 return true; 1414 } else { 1415 nmethod* result = method->code(); 1416 if (result == NULL) return false; 1417 return comp_level == result->comp_level(); 1418 } 1419 } 1420} 1421 1422 1423/** 1424 * See if this compilation is already requested. 1425 * 1426 * Implementation note: there is only a single "is in queue" bit 1427 * for each method. This means that the check below is overly 1428 * conservative in the sense that an osr compilation in the queue 1429 * will block a normal compilation from entering the queue (and vice 1430 * versa). This can be remedied by a full queue search to disambiguate 1431 * cases. If it is deemed profitable, this may be done. 1432 */ 1433bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1434 return method->queued_for_compilation(); 1435} 1436 1437// ------------------------------------------------------------------ 1438// CompileBroker::compilation_is_prohibited 1439// 1440// See if this compilation is not allowed. 1441bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1442 bool is_native = method->is_native(); 1443 // Some compilers may not support the compilation of natives. 1444 AbstractCompiler *comp = compiler(comp_level); 1445 if (is_native && 1446 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1447 method->set_not_compilable_quietly(comp_level); 1448 return true; 1449 } 1450 1451 bool is_osr = (osr_bci != standard_entry_bci); 1452 // Some compilers may not support on stack replacement. 1453 if (is_osr && 1454 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1455 method->set_not_osr_compilable(comp_level); 1456 return true; 1457 } 1458 1459 // The method may be explicitly excluded by the user. 1460 bool quietly; 1461 if (CompilerOracle::should_exclude(method, quietly)) { 1462 if (!quietly) { 1463 // This does not happen quietly... 1464 ResourceMark rm; 1465 tty->print("### Excluding %s:%s", 1466 method->is_native() ? "generation of native wrapper" : "compile", 1467 (method->is_static() ? " static" : "")); 1468 method->print_short_name(tty); 1469 tty->cr(); 1470 } 1471 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1472 } 1473 1474 return false; 1475} 1476 1477/** 1478 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1479 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1480 * The function also allows to generate separate compilation IDs for OSR compilations. 1481 */ 1482int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1483#ifdef ASSERT 1484 bool is_osr = (osr_bci != standard_entry_bci); 1485 int id; 1486 if (method->is_native()) { 1487 assert(!is_osr, "can't be osr"); 1488 // Adapters, native wrappers and method handle intrinsics 1489 // should be generated always. 1490 return Atomic::add(1, &_compilation_id); 1491 } else if (CICountOSR && is_osr) { 1492 id = Atomic::add(1, &_osr_compilation_id); 1493 if (CIStartOSR <= id && id < CIStopOSR) { 1494 return id; 1495 } 1496 } else { 1497 id = Atomic::add(1, &_compilation_id); 1498 if (CIStart <= id && id < CIStop) { 1499 return id; 1500 } 1501 } 1502 1503 // Method was not in the appropriate compilation range. 1504 method->set_not_compilable_quietly(); 1505 return 0; 1506#else 1507 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1508 // only _compilation_id is incremented. 1509 return Atomic::add(1, &_compilation_id); 1510#endif 1511} 1512 1513/** 1514 * Should the current thread block until this compilation request 1515 * has been fulfilled? 1516 */ 1517bool CompileBroker::is_compile_blocking() { 1518 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1519 return !BackgroundCompilation; 1520} 1521 1522 1523// ------------------------------------------------------------------ 1524// CompileBroker::preload_classes 1525void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1526 // Move this code over from c1_Compiler.cpp 1527 ShouldNotReachHere(); 1528} 1529 1530 1531// ------------------------------------------------------------------ 1532// CompileBroker::create_compile_task 1533// 1534// Create a CompileTask object representing the current request for 1535// compilation. Add this task to the queue. 1536CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1537 int compile_id, 1538 methodHandle method, 1539 int osr_bci, 1540 int comp_level, 1541 methodHandle hot_method, 1542 int hot_count, 1543 const char* comment, 1544 bool blocking) { 1545 CompileTask* new_task = CompileTask::allocate(); 1546 new_task->initialize(compile_id, method, osr_bci, comp_level, 1547 hot_method, hot_count, comment, 1548 blocking); 1549 queue->add(new_task); 1550 return new_task; 1551} 1552 1553 1554/** 1555 * Wait for the compilation task to complete. 1556 */ 1557void CompileBroker::wait_for_completion(CompileTask* task) { 1558 if (CIPrintCompileQueue) { 1559 ttyLocker ttyl; 1560 tty->print_cr("BLOCKING FOR COMPILE"); 1561 } 1562 1563 assert(task->is_blocking(), "can only wait on blocking task"); 1564 1565 JavaThread* thread = JavaThread::current(); 1566 thread->set_blocked_on_compilation(true); 1567 1568 methodHandle method(thread, task->method()); 1569 { 1570 MutexLocker waiter(task->lock(), thread); 1571 1572 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1573 task->lock()->wait(); 1574 } 1575 } 1576 1577 thread->set_blocked_on_compilation(false); 1578 if (is_compilation_disabled_forever()) { 1579 CompileTask::free(task); 1580 return; 1581 } 1582 1583 // It is harmless to check this status without the lock, because 1584 // completion is a stable property (until the task object is recycled). 1585 assert(task->is_complete(), "Compilation should have completed"); 1586 assert(task->code_handle() == NULL, "must be reset"); 1587 1588 // By convention, the waiter is responsible for recycling a 1589 // blocking CompileTask. Since there is only one waiter ever 1590 // waiting on a CompileTask, we know that no one else will 1591 // be using this CompileTask; we can free it. 1592 CompileTask::free(task); 1593} 1594 1595/** 1596 * Initialize compiler thread(s) + compiler object(s). The postcondition 1597 * of this function is that the compiler runtimes are initialized and that 1598 * compiler threads can start compiling. 1599 */ 1600bool CompileBroker::init_compiler_runtime() { 1601 CompilerThread* thread = CompilerThread::current(); 1602 AbstractCompiler* comp = thread->compiler(); 1603 // Final sanity check - the compiler object must exist 1604 guarantee(comp != NULL, "Compiler object must exist"); 1605 1606 int system_dictionary_modification_counter; 1607 { 1608 MutexLocker locker(Compile_lock, thread); 1609 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1610 } 1611 1612 { 1613 // Must switch to native to allocate ci_env 1614 ThreadToNativeFromVM ttn(thread); 1615 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1616 // Cache Jvmti state 1617 ci_env.cache_jvmti_state(); 1618 // Cache DTrace flags 1619 ci_env.cache_dtrace_flags(); 1620 1621 // Switch back to VM state to do compiler initialization 1622 ThreadInVMfromNative tv(thread); 1623 ResetNoHandleMark rnhm; 1624 1625 1626 if (!comp->is_shark()) { 1627 // Perform per-thread and global initializations 1628 comp->initialize(); 1629 } 1630 } 1631 1632 if (comp->is_failed()) { 1633 disable_compilation_forever(); 1634 // If compiler initialization failed, no compiler thread that is specific to a 1635 // particular compiler runtime will ever start to compile methods. 1636 shutdown_compiler_runtime(comp, thread); 1637 return false; 1638 } 1639 1640 // C1 specific check 1641 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1642 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1643 return false; 1644 } 1645 1646 return true; 1647} 1648 1649/** 1650 * If C1 and/or C2 initialization failed, we shut down all compilation. 1651 * We do this to keep things simple. This can be changed if it ever turns 1652 * out to be a problem. 1653 */ 1654void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1655 // Free buffer blob, if allocated 1656 if (thread->get_buffer_blob() != NULL) { 1657 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1658 CodeCache::free(thread->get_buffer_blob()); 1659 } 1660 1661 if (comp->should_perform_shutdown()) { 1662 // There are two reasons for shutting down the compiler 1663 // 1) compiler runtime initialization failed 1664 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1665 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1666 1667 // Only one thread per compiler runtime object enters here 1668 // Set state to shut down 1669 comp->set_shut_down(); 1670 1671 // Delete all queued compilation tasks to make compiler threads exit faster. 1672 if (_c1_compile_queue != NULL) { 1673 _c1_compile_queue->free_all(); 1674 } 1675 1676 if (_c2_compile_queue != NULL) { 1677 _c2_compile_queue->free_all(); 1678 } 1679 1680 // Set flags so that we continue execution with using interpreter only. 1681 UseCompiler = false; 1682 UseInterpreter = true; 1683 1684 // We could delete compiler runtimes also. However, there are references to 1685 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1686 // fail. This can be done later if necessary. 1687 } 1688} 1689 1690// ------------------------------------------------------------------ 1691// CompileBroker::compiler_thread_loop 1692// 1693// The main loop run by a CompilerThread. 1694void CompileBroker::compiler_thread_loop() { 1695 CompilerThread* thread = CompilerThread::current(); 1696 CompileQueue* queue = thread->queue(); 1697 // For the thread that initializes the ciObjectFactory 1698 // this resource mark holds all the shared objects 1699 ResourceMark rm; 1700 1701 // First thread to get here will initialize the compiler interface 1702 1703 if (!ciObjectFactory::is_initialized()) { 1704 ASSERT_IN_VM; 1705 MutexLocker only_one (CompileThread_lock, thread); 1706 if (!ciObjectFactory::is_initialized()) { 1707 ciObjectFactory::initialize(); 1708 } 1709 } 1710 1711 // Open a log. 1712 if (LogCompilation) { 1713 init_compiler_thread_log(); 1714 } 1715 CompileLog* log = thread->log(); 1716 if (log != NULL) { 1717 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1718 thread->name(), 1719 os::current_thread_id(), 1720 os::current_process_id()); 1721 log->stamp(); 1722 log->end_elem(); 1723 } 1724 1725 // If compiler thread/runtime initialization fails, exit the compiler thread 1726 if (!init_compiler_runtime()) { 1727 return; 1728 } 1729 1730 // Poll for new compilation tasks as long as the JVM runs. Compilation 1731 // should only be disabled if something went wrong while initializing the 1732 // compiler runtimes. This, in turn, should not happen. The only known case 1733 // when compiler runtime initialization fails is if there is not enough free 1734 // space in the code cache to generate the necessary stubs, etc. 1735 while (!is_compilation_disabled_forever()) { 1736 // We need this HandleMark to avoid leaking VM handles. 1737 HandleMark hm(thread); 1738 1739 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1740 // the code cache is really full 1741 handle_full_code_cache(); 1742 } 1743 1744 CompileTask* task = queue->get(); 1745 if (task == NULL) { 1746 continue; 1747 } 1748 1749 // Give compiler threads an extra quanta. They tend to be bursty and 1750 // this helps the compiler to finish up the job. 1751 if( CompilerThreadHintNoPreempt ) 1752 os::hint_no_preempt(); 1753 1754 // trace per thread time and compile statistics 1755 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1756 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1757 1758 // Assign the task to the current thread. Mark this compilation 1759 // thread as active for the profiler. 1760 CompileTaskWrapper ctw(task); 1761 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1762 task->set_code_handle(&result_handle); 1763 methodHandle method(thread, task->method()); 1764 1765 // Never compile a method if breakpoints are present in it 1766 if (method()->number_of_breakpoints() == 0) { 1767 // Compile the method. 1768 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1769#ifdef COMPILER1 1770 // Allow repeating compilations for the purpose of benchmarking 1771 // compile speed. This is not useful for customers. 1772 if (CompilationRepeat != 0) { 1773 int compile_count = CompilationRepeat; 1774 while (compile_count > 0) { 1775 invoke_compiler_on_method(task); 1776 nmethod* nm = method->code(); 1777 if (nm != NULL) { 1778 nm->make_zombie(); 1779 method->clear_code(); 1780 } 1781 compile_count--; 1782 } 1783 } 1784#endif /* COMPILER1 */ 1785 invoke_compiler_on_method(task); 1786 } else { 1787 // After compilation is disabled, remove remaining methods from queue 1788 method->clear_queued_for_compilation(); 1789 } 1790 } 1791 } 1792 1793 // Shut down compiler runtime 1794 shutdown_compiler_runtime(thread->compiler(), thread); 1795} 1796 1797// ------------------------------------------------------------------ 1798// CompileBroker::init_compiler_thread_log 1799// 1800// Set up state required by +LogCompilation. 1801void CompileBroker::init_compiler_thread_log() { 1802 CompilerThread* thread = CompilerThread::current(); 1803 char file_name[4*K]; 1804 FILE* fp = NULL; 1805 intx thread_id = os::current_thread_id(); 1806 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1807 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1808 if (dir == NULL) { 1809 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1810 thread_id, os::current_process_id()); 1811 } else { 1812 jio_snprintf(file_name, sizeof(file_name), 1813 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1814 os::file_separator(), thread_id, os::current_process_id()); 1815 } 1816 1817 fp = fopen(file_name, "at"); 1818 if (fp != NULL) { 1819 if (LogCompilation && Verbose) { 1820 tty->print_cr("Opening compilation log %s", file_name); 1821 } 1822 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1823 thread->init_log(log); 1824 1825 if (xtty != NULL) { 1826 ttyLocker ttyl; 1827 // Record any per thread log files 1828 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1829 } 1830 return; 1831 } 1832 } 1833 warning("Cannot open log file: %s", file_name); 1834} 1835 1836// ------------------------------------------------------------------ 1837// CompileBroker::set_should_block 1838// 1839// Set _should_block. 1840// Call this from the VM, with Threads_lock held and a safepoint requested. 1841void CompileBroker::set_should_block() { 1842 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1843 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1844#ifndef PRODUCT 1845 if (PrintCompilation && (Verbose || WizardMode)) 1846 tty->print_cr("notifying compiler thread pool to block"); 1847#endif 1848 _should_block = true; 1849} 1850 1851// ------------------------------------------------------------------ 1852// CompileBroker::maybe_block 1853// 1854// Call this from the compiler at convenient points, to poll for _should_block. 1855void CompileBroker::maybe_block() { 1856 if (_should_block) { 1857#ifndef PRODUCT 1858 if (PrintCompilation && (Verbose || WizardMode)) 1859 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1860#endif 1861 ThreadInVMfromNative tivfn(JavaThread::current()); 1862 } 1863} 1864 1865// wrapper for CodeCache::print_summary() 1866static void codecache_print(bool detailed) 1867{ 1868 ResourceMark rm; 1869 stringStream s; 1870 // Dump code cache into a buffer before locking the tty, 1871 { 1872 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1873 CodeCache::print_summary(&s, detailed); 1874 } 1875 ttyLocker ttyl; 1876 tty->print("%s", s.as_string()); 1877} 1878 1879// ------------------------------------------------------------------ 1880// CompileBroker::invoke_compiler_on_method 1881// 1882// Compile a method. 1883// 1884void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1885 if (PrintCompilation) { 1886 ResourceMark rm; 1887 task->print_line(); 1888 } 1889 elapsedTimer time; 1890 1891 CompilerThread* thread = CompilerThread::current(); 1892 ResourceMark rm(thread); 1893 1894 if (LogEvents) { 1895 _compilation_log->log_compile(thread, task); 1896 } 1897 1898 // Common flags. 1899 uint compile_id = task->compile_id(); 1900 int osr_bci = task->osr_bci(); 1901 bool is_osr = (osr_bci != standard_entry_bci); 1902 bool should_log = (thread->log() != NULL); 1903 bool should_break = false; 1904 int task_level = task->comp_level(); 1905 { 1906 // create the handle inside it's own block so it can't 1907 // accidentally be referenced once the thread transitions to 1908 // native. The NoHandleMark before the transition should catch 1909 // any cases where this occurs in the future. 1910 methodHandle method(thread, task->method()); 1911 should_break = check_break_at(method, compile_id, is_osr); 1912 if (should_log && !CompilerOracle::should_log(method)) { 1913 should_log = false; 1914 } 1915 assert(!method->is_native(), "no longer compile natives"); 1916 1917 // Save information about this method in case of failure. 1918 set_last_compile(thread, method, is_osr, task_level); 1919 1920 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1921 } 1922 1923 // Allocate a new set of JNI handles. 1924 push_jni_handle_block(); 1925 Method* target_handle = task->method(); 1926 int compilable = ciEnv::MethodCompilable; 1927 { 1928 int system_dictionary_modification_counter; 1929 { 1930 MutexLocker locker(Compile_lock, thread); 1931 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1932 } 1933 1934 NoHandleMark nhm; 1935 ThreadToNativeFromVM ttn(thread); 1936 1937 ciEnv ci_env(task, system_dictionary_modification_counter); 1938 if (should_break) { 1939 ci_env.set_break_at_compile(true); 1940 } 1941 if (should_log) { 1942 ci_env.set_log(thread->log()); 1943 } 1944 assert(thread->env() == &ci_env, "set by ci_env"); 1945 // The thread-env() field is cleared in ~CompileTaskWrapper. 1946 1947 // Cache Jvmti state 1948 ci_env.cache_jvmti_state(); 1949 1950 // Cache DTrace flags 1951 ci_env.cache_dtrace_flags(); 1952 1953 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1954 1955 TraceTime t1("compilation", &time); 1956 EventCompilation event; 1957 1958 AbstractCompiler *comp = compiler(task_level); 1959 if (comp == NULL) { 1960 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1961 } else { 1962 comp->compile_method(&ci_env, target, osr_bci); 1963 } 1964 1965 if (!ci_env.failing() && task->code() == NULL) { 1966 //assert(false, "compiler should always document failure"); 1967 // The compiler elected, without comment, not to register a result. 1968 // Do not attempt further compilations of this method. 1969 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1970 } 1971 1972 // Copy this bit to the enclosing block: 1973 compilable = ci_env.compilable(); 1974 1975 if (ci_env.failing()) { 1976 const char* retry_message = ci_env.retry_message(); 1977 if (_compilation_log != NULL) { 1978 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1979 } 1980 if (PrintCompilation) { 1981 FormatBufferResource msg = retry_message != NULL ? 1982 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1983 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1984 task->print_compilation(tty, msg); 1985 } 1986 } else { 1987 task->mark_success(); 1988 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 1989 if (_compilation_log != NULL) { 1990 nmethod* code = task->code(); 1991 if (code != NULL) { 1992 _compilation_log->log_nmethod(thread, code); 1993 } 1994 } 1995 } 1996 // simulate crash during compilation 1997 assert(task->compile_id() != CICrashAt, "just as planned"); 1998 if (event.should_commit()) { 1999 event.set_method(target->get_Method()); 2000 event.set_compileID(compile_id); 2001 event.set_compileLevel(task->comp_level()); 2002 event.set_succeded(task->is_success()); 2003 event.set_isOsr(is_osr); 2004 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 2005 event.set_inlinedBytes(task->num_inlined_bytecodes()); 2006 event.commit(); 2007 } 2008 } 2009 pop_jni_handle_block(); 2010 2011 methodHandle method(thread, task->method()); 2012 2013 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2014 2015 collect_statistics(thread, time, task); 2016 2017 if (PrintCompilation && PrintCompilation2) { 2018 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2019 tty->print("%4d ", compile_id); // print compilation number 2020 tty->print("%s ", (is_osr ? "%" : " ")); 2021 if (task->code() != NULL) { 2022 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2023 } 2024 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2025 } 2026 2027 if (PrintCodeCacheOnCompilation) 2028 codecache_print(/* detailed= */ false); 2029 2030 // Disable compilation, if required. 2031 switch (compilable) { 2032 case ciEnv::MethodCompilable_never: 2033 if (is_osr) 2034 method->set_not_osr_compilable_quietly(); 2035 else 2036 method->set_not_compilable_quietly(); 2037 break; 2038 case ciEnv::MethodCompilable_not_at_tier: 2039 if (is_osr) 2040 method->set_not_osr_compilable_quietly(task_level); 2041 else 2042 method->set_not_compilable_quietly(task_level); 2043 break; 2044 } 2045 2046 // Note that the queued_for_compilation bits are cleared without 2047 // protection of a mutex. [They were set by the requester thread, 2048 // when adding the task to the compile queue -- at which time the 2049 // compile queue lock was held. Subsequently, we acquired the compile 2050 // queue lock to get this task off the compile queue; thus (to belabour 2051 // the point somewhat) our clearing of the bits must be occurring 2052 // only after the setting of the bits. See also 14012000 above. 2053 method->clear_queued_for_compilation(); 2054 2055#ifdef ASSERT 2056 if (CollectedHeap::fired_fake_oom()) { 2057 // The current compile received a fake OOM during compilation so 2058 // go ahead and exit the VM since the test apparently succeeded 2059 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2060 vm_exit(0); 2061 } 2062#endif 2063} 2064 2065/** 2066 * The CodeCache is full. Print out warning and disable compilation 2067 * or try code cache cleaning so compilation can continue later. 2068 */ 2069void CompileBroker::handle_full_code_cache() { 2070 UseInterpreter = true; 2071 if (UseCompiler || AlwaysCompileLoopMethods ) { 2072 if (xtty != NULL) { 2073 ResourceMark rm; 2074 stringStream s; 2075 // Dump code cache state into a buffer before locking the tty, 2076 // because log_state() will use locks causing lock conflicts. 2077 CodeCache::log_state(&s); 2078 // Lock to prevent tearing 2079 ttyLocker ttyl; 2080 xtty->begin_elem("code_cache_full"); 2081 xtty->print("%s", s.as_string()); 2082 xtty->stamp(); 2083 xtty->end_elem(); 2084 } 2085 2086 CodeCache::report_codemem_full(); 2087 2088#ifndef PRODUCT 2089 if (CompileTheWorld || ExitOnFullCodeCache) { 2090 codecache_print(/* detailed= */ true); 2091 before_exit(JavaThread::current()); 2092 exit_globals(); // will delete tty 2093 vm_direct_exit(CompileTheWorld ? 0 : 1); 2094 } 2095#endif 2096 if (UseCodeCacheFlushing) { 2097 // Since code cache is full, immediately stop new compiles 2098 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2099 NMethodSweeper::log_sweep("disable_compiler"); 2100 } 2101 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2102 // without having to consider the state in which the current thread is. 2103 ThreadInVMfromUnknown in_vm; 2104 NMethodSweeper::possibly_sweep(); 2105 } else { 2106 disable_compilation_forever(); 2107 } 2108 2109 // Print warning only once 2110 if (should_print_compiler_warning()) { 2111 warning("CodeCache is full. Compiler has been disabled."); 2112 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2113 codecache_print(/* detailed= */ true); 2114 } 2115 } 2116} 2117 2118// ------------------------------------------------------------------ 2119// CompileBroker::set_last_compile 2120// 2121// Record this compilation for debugging purposes. 2122void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2123 ResourceMark rm; 2124 char* method_name = method->name()->as_C_string(); 2125 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2126 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2127 char current_method[CompilerCounters::cmname_buffer_length]; 2128 size_t maxLen = CompilerCounters::cmname_buffer_length; 2129 2130 if (UsePerfData) { 2131 const char* class_name = method->method_holder()->name()->as_C_string(); 2132 2133 size_t s1len = strlen(class_name); 2134 size_t s2len = strlen(method_name); 2135 2136 // check if we need to truncate the string 2137 if (s1len + s2len + 2 > maxLen) { 2138 2139 // the strategy is to lop off the leading characters of the 2140 // class name and the trailing characters of the method name. 2141 2142 if (s2len + 2 > maxLen) { 2143 // lop of the entire class name string, let snprintf handle 2144 // truncation of the method name. 2145 class_name += s1len; // null string 2146 } 2147 else { 2148 // lop off the extra characters from the front of the class name 2149 class_name += ((s1len + s2len + 2) - maxLen); 2150 } 2151 } 2152 2153 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2154 } 2155 2156 if (CICountOSR && is_osr) { 2157 _last_compile_type = osr_compile; 2158 } else { 2159 _last_compile_type = normal_compile; 2160 } 2161 _last_compile_level = comp_level; 2162 2163 if (UsePerfData) { 2164 CompilerCounters* counters = thread->counters(); 2165 counters->set_current_method(current_method); 2166 counters->set_compile_type((jlong)_last_compile_type); 2167 } 2168} 2169 2170 2171// ------------------------------------------------------------------ 2172// CompileBroker::push_jni_handle_block 2173// 2174// Push on a new block of JNI handles. 2175void CompileBroker::push_jni_handle_block() { 2176 JavaThread* thread = JavaThread::current(); 2177 2178 // Allocate a new block for JNI handles. 2179 // Inlined code from jni_PushLocalFrame() 2180 JNIHandleBlock* java_handles = thread->active_handles(); 2181 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2182 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2183 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2184 thread->set_active_handles(compile_handles); 2185} 2186 2187 2188// ------------------------------------------------------------------ 2189// CompileBroker::pop_jni_handle_block 2190// 2191// Pop off the current block of JNI handles. 2192void CompileBroker::pop_jni_handle_block() { 2193 JavaThread* thread = JavaThread::current(); 2194 2195 // Release our JNI handle block 2196 JNIHandleBlock* compile_handles = thread->active_handles(); 2197 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2198 thread->set_active_handles(java_handles); 2199 compile_handles->set_pop_frame_link(NULL); 2200 JNIHandleBlock::release_block(compile_handles, thread); // may block 2201} 2202 2203 2204// ------------------------------------------------------------------ 2205// CompileBroker::check_break_at 2206// 2207// Should the compilation break at the current compilation. 2208bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2209 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2210 return true; 2211 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2212 return true; 2213 } else { 2214 return (compile_id == CIBreakAt); 2215 } 2216} 2217 2218// ------------------------------------------------------------------ 2219// CompileBroker::collect_statistics 2220// 2221// Collect statistics about the compilation. 2222 2223void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2224 bool success = task->is_success(); 2225 methodHandle method (thread, task->method()); 2226 uint compile_id = task->compile_id(); 2227 bool is_osr = (task->osr_bci() != standard_entry_bci); 2228 nmethod* code = task->code(); 2229 CompilerCounters* counters = thread->counters(); 2230 2231 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2232 MutexLocker locker(CompileStatistics_lock); 2233 2234 // _perf variables are production performance counters which are 2235 // updated regardless of the setting of the CITime and CITimeEach flags 2236 // 2237 if (!success) { 2238 _total_bailout_count++; 2239 if (UsePerfData) { 2240 _perf_last_failed_method->set_value(counters->current_method()); 2241 _perf_last_failed_type->set_value(counters->compile_type()); 2242 _perf_total_bailout_count->inc(); 2243 } 2244 } else if (code == NULL) { 2245 if (UsePerfData) { 2246 _perf_last_invalidated_method->set_value(counters->current_method()); 2247 _perf_last_invalidated_type->set_value(counters->compile_type()); 2248 _perf_total_invalidated_count->inc(); 2249 } 2250 _total_invalidated_count++; 2251 } else { 2252 // Compilation succeeded 2253 2254 // update compilation ticks - used by the implementation of 2255 // java.lang.management.CompilationMBean 2256 _perf_total_compilation->inc(time.ticks()); 2257 2258 _t_total_compilation.add(time); 2259 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2260 2261 if (CITime) { 2262 if (is_osr) { 2263 _t_osr_compilation.add(time); 2264 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2265 } else { 2266 _t_standard_compilation.add(time); 2267 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2268 } 2269 } 2270 2271 if (UsePerfData) { 2272 // save the name of the last method compiled 2273 _perf_last_method->set_value(counters->current_method()); 2274 _perf_last_compile_type->set_value(counters->compile_type()); 2275 _perf_last_compile_size->set_value(method->code_size() + 2276 task->num_inlined_bytecodes()); 2277 if (is_osr) { 2278 _perf_osr_compilation->inc(time.ticks()); 2279 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2280 } else { 2281 _perf_standard_compilation->inc(time.ticks()); 2282 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2283 } 2284 } 2285 2286 if (CITimeEach) { 2287 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2288 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2289 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2290 } 2291 2292 // Collect counts of successful compilations 2293 _sum_nmethod_size += code->total_size(); 2294 _sum_nmethod_code_size += code->insts_size(); 2295 _total_compile_count++; 2296 2297 if (UsePerfData) { 2298 _perf_sum_nmethod_size->inc( code->total_size()); 2299 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2300 _perf_total_compile_count->inc(); 2301 } 2302 2303 if (is_osr) { 2304 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2305 _total_osr_compile_count++; 2306 } else { 2307 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2308 _total_standard_compile_count++; 2309 } 2310 } 2311 // set the current method for the thread to null 2312 if (UsePerfData) counters->set_current_method(""); 2313} 2314 2315const char* CompileBroker::compiler_name(int comp_level) { 2316 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2317 if (comp == NULL) { 2318 return "no compiler"; 2319 } else { 2320 return (comp->name()); 2321 } 2322} 2323 2324void CompileBroker::print_times() { 2325 tty->cr(); 2326 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2327 tty->print_cr("------------------------------------------------"); 2328 //0000000000111111111122222222223333333333444444444455555555556666666666 2329 //0123456789012345678901234567890123456789012345678901234567890123456789 2330 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2331 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2332 CompileBroker::_t_standard_compilation.seconds(), 2333 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2334 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); 2335 2336 AbstractCompiler *comp = compiler(CompLevel_simple); 2337 if (comp != NULL) { 2338 comp->print_timers(); 2339 } 2340 comp = compiler(CompLevel_full_optimization); 2341 if (comp != NULL) { 2342 comp->print_timers(); 2343 } 2344 tty->cr(); 2345 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2346 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2347 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2348 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2349 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2350 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2351 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2352 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2353 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2354 tty->cr(); 2355 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2356 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2357} 2358 2359// Debugging output for failure 2360void CompileBroker::print_last_compile() { 2361 if ( _last_compile_level != CompLevel_none && 2362 compiler(_last_compile_level) != NULL && 2363 _last_method_compiled != NULL && 2364 _last_compile_type != no_compile) { 2365 if (_last_compile_type == osr_compile) { 2366 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2367 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2368 } else { 2369 tty->print_cr("Last parse: %d+++(%d) %s", 2370 _compilation_id, _last_compile_level, _last_method_compiled); 2371 } 2372 } 2373} 2374 2375 2376void CompileBroker::print_compiler_threads_on(outputStream* st) { 2377#ifndef PRODUCT 2378 st->print_cr("Compiler thread printing unimplemented."); 2379 st->cr(); 2380#endif 2381} 2382