1 /* 2 * Copyright (c) 1999, 2013, 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/compilationPolicy.hpp" 40 #include "runtime/init.hpp" 41 #include "runtime/interfaceSupport.hpp" 42 #include "runtime/javaCalls.hpp" 43 #include "runtime/os.hpp" 44 #include "runtime/sharedRuntime.hpp" 45 #include "runtime/sweeper.hpp" 46 #include "trace/tracing.hpp" 47 #include "utilities/dtrace.hpp" 48 #include "utilities/events.hpp" 49 #ifdef COMPILER1 50 #include "c1/c1_Compiler.hpp" 51 #endif 52 #ifdef COMPILER2 53 #include "opto/c2compiler.hpp" 54 #endif 55 #ifdef SHARK 56 #include "shark/sharkCompiler.hpp" 57 #endif 58 59 #ifdef DTRACE_ENABLED 60 61 // Only bother with this argument setup if dtrace is available 62 63 #ifndef USDT2 64 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin, 65 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t); 66 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end, 67 char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool); 68 69 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 70 { \ 71 Symbol* klass_name = (method)->klass_name(); \ 72 Symbol* name = (method)->name(); \ 73 Symbol* signature = (method)->signature(); \ 74 HS_DTRACE_PROBE8(hotspot, method__compile__begin, \ 75 comp_name, strlen(comp_name), \ 76 klass_name->bytes(), klass_name->utf8_length(), \ 77 name->bytes(), name->utf8_length(), \ 78 signature->bytes(), signature->utf8_length()); \ 79 } 80 81 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 82 { \ 83 Symbol* klass_name = (method)->klass_name(); \ 84 Symbol* name = (method)->name(); \ 85 Symbol* signature = (method)->signature(); \ 86 HS_DTRACE_PROBE9(hotspot, method__compile__end, \ 87 comp_name, strlen(comp_name), \ 88 klass_name->bytes(), klass_name->utf8_length(), \ 89 name->bytes(), name->utf8_length(), \ 90 signature->bytes(), signature->utf8_length(), (success)); \ 91 } 92 93 #else /* USDT2 */ 94 95 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \ 96 { \ 97 Symbol* klass_name = (method)->klass_name(); \ 98 Symbol* name = (method)->name(); \ 99 Symbol* signature = (method)->signature(); \ 100 HOTSPOT_METHOD_COMPILE_BEGIN( \ 101 comp_name, strlen(comp_name), \ 102 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 103 (char *) name->bytes(), name->utf8_length(), \ 104 (char *) signature->bytes(), signature->utf8_length()); \ 105 } 106 107 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \ 108 { \ 109 Symbol* klass_name = (method)->klass_name(); \ 110 Symbol* name = (method)->name(); \ 111 Symbol* signature = (method)->signature(); \ 112 HOTSPOT_METHOD_COMPILE_END( \ 113 comp_name, strlen(comp_name), \ 114 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 115 (char *) name->bytes(), name->utf8_length(), \ 116 (char *) signature->bytes(), signature->utf8_length(), (success)); \ 117 } 118 #endif /* USDT2 */ 119 120 #else // ndef DTRACE_ENABLED 121 122 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 123 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 124 125 #endif // ndef DTRACE_ENABLED 126 127 bool CompileBroker::_initialized = false; 128 volatile bool CompileBroker::_should_block = false; 129 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 130 131 // The installed compiler(s) 132 AbstractCompiler* CompileBroker::_compilers[2]; 133 134 // These counters are used for assigning id's to each compilation 135 uint CompileBroker::_compilation_id = 0; 136 uint CompileBroker::_osr_compilation_id = 0; 137 138 // Debugging information 139 int CompileBroker::_last_compile_type = no_compile; 140 int CompileBroker::_last_compile_level = CompLevel_none; 141 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 142 143 // Performance counters 144 PerfCounter* CompileBroker::_perf_total_compilation = NULL; 145 PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 146 PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 147 148 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 149 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 150 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 151 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 152 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 153 154 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 155 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 156 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 157 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 158 159 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 160 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 161 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 162 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 163 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 164 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 165 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 166 167 // Timers and counters for generating statistics 168 elapsedTimer CompileBroker::_t_total_compilation; 169 elapsedTimer CompileBroker::_t_osr_compilation; 170 elapsedTimer CompileBroker::_t_standard_compilation; 171 172 int CompileBroker::_total_bailout_count = 0; 173 int CompileBroker::_total_invalidated_count = 0; 174 int CompileBroker::_total_compile_count = 0; 175 int CompileBroker::_total_osr_compile_count = 0; 176 int CompileBroker::_total_standard_compile_count = 0; 177 178 int CompileBroker::_sum_osr_bytes_compiled = 0; 179 int CompileBroker::_sum_standard_bytes_compiled = 0; 180 int CompileBroker::_sum_nmethod_size = 0; 181 int CompileBroker::_sum_nmethod_code_size = 0; 182 183 long CompileBroker::_peak_compilation_time = 0; 184 185 CompileQueue* CompileBroker::_c2_method_queue = NULL; 186 CompileQueue* CompileBroker::_c1_method_queue = NULL; 187 CompileTask* CompileBroker::_task_free_list = NULL; 188 189 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL; 190 191 192 class CompilationLog : public StringEventLog { 193 public: 194 CompilationLog() : StringEventLog("Compilation events") { 195 } 196 197 void log_compile(JavaThread* thread, CompileTask* task) { 198 StringLogMessage lm; 199 stringStream sstr = lm.stream(); 200 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 201 task->print_compilation(&sstr, NULL, true); 202 log(thread, "%s", (const char*)lm); 203 } 204 205 void log_nmethod(JavaThread* thread, nmethod* nm) { 206 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]", 207 nm->compile_id(), nm->is_osr_method() ? "%" : "", 208 nm, nm->code_begin(), nm->code_end()); 209 } 210 211 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 212 StringLogMessage lm; 213 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 214 if (retry_message != NULL) { 215 lm.append(" (%s)", retry_message); 216 } 217 lm.print("\n"); 218 log(thread, "%s", (const char*)lm); 219 } 220 }; 221 222 static CompilationLog* _compilation_log = NULL; 223 224 void compileBroker_init() { 225 if (LogEvents) { 226 _compilation_log = new CompilationLog(); 227 } 228 } 229 230 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 231 CompilerThread* thread = CompilerThread::current(); 232 thread->set_task(task); 233 CompileLog* log = thread->log(); 234 if (log != NULL) task->log_task_start(log); 235 } 236 237 CompileTaskWrapper::~CompileTaskWrapper() { 238 CompilerThread* thread = CompilerThread::current(); 239 CompileTask* task = thread->task(); 240 CompileLog* log = thread->log(); 241 if (log != NULL) task->log_task_done(log); 242 thread->set_task(NULL); 243 task->set_code_handle(NULL); 244 thread->set_env(NULL); 245 if (task->is_blocking()) { 246 MutexLocker notifier(task->lock(), thread); 247 task->mark_complete(); 248 // Notify the waiting thread that the compilation has completed. 249 task->lock()->notify_all(); 250 } else { 251 task->mark_complete(); 252 253 // By convention, the compiling thread is responsible for 254 // recycling a non-blocking CompileTask. 255 CompileBroker::free_task(task); 256 } 257 } 258 259 260 // ------------------------------------------------------------------ 261 // CompileTask::initialize 262 void CompileTask::initialize(int compile_id, 263 methodHandle method, 264 int osr_bci, 265 int comp_level, 266 methodHandle hot_method, 267 int hot_count, 268 const char* comment, 269 bool is_blocking) { 270 assert(!_lock->is_locked(), "bad locking"); 271 272 _compile_id = compile_id; 273 _method = method(); 274 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 275 _osr_bci = osr_bci; 276 _is_blocking = is_blocking; 277 _comp_level = comp_level; 278 _num_inlined_bytecodes = 0; 279 280 _is_complete = false; 281 _is_success = false; 282 _code_handle = NULL; 283 284 _hot_method = NULL; 285 _hot_method_holder = NULL; 286 _hot_count = hot_count; 287 _time_queued = 0; // tidy 288 _comment = comment; 289 290 if (LogCompilation) { 291 _time_queued = os::elapsed_counter(); 292 if (hot_method.not_null()) { 293 if (hot_method == method) { 294 _hot_method = _method; 295 } else { 296 _hot_method = hot_method(); 297 // only add loader or mirror if different from _method_holder 298 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 299 } 300 } 301 } 302 303 _next = NULL; 304 } 305 306 // ------------------------------------------------------------------ 307 // CompileTask::code/set_code 308 nmethod* CompileTask::code() const { 309 if (_code_handle == NULL) return NULL; 310 return _code_handle->code(); 311 } 312 void CompileTask::set_code(nmethod* nm) { 313 if (_code_handle == NULL && nm == NULL) return; 314 guarantee(_code_handle != NULL, ""); 315 _code_handle->set_code(nm); 316 if (nm == NULL) _code_handle = NULL; // drop the handle also 317 } 318 319 // ------------------------------------------------------------------ 320 // CompileTask::free 321 void CompileTask::free() { 322 set_code(NULL); 323 assert(!_lock->is_locked(), "Should not be locked when freed"); 324 JNIHandles::destroy_global(_method_holder); 325 JNIHandles::destroy_global(_hot_method_holder); 326 } 327 328 329 void CompileTask::mark_on_stack() { 330 // Mark these methods as something redefine classes cannot remove. 331 _method->set_on_stack(true); 332 if (_hot_method != NULL) { 333 _hot_method->set_on_stack(true); 334 } 335 } 336 337 // ------------------------------------------------------------------ 338 // CompileTask::print 339 void CompileTask::print() { 340 tty->print("<CompileTask compile_id=%d ", _compile_id); 341 tty->print("method="); 342 _method->print_name(tty); 343 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>", 344 _osr_bci, bool_to_str(_is_blocking), 345 bool_to_str(_is_complete), bool_to_str(_is_success)); 346 } 347 348 349 // ------------------------------------------------------------------ 350 // CompileTask::print_line_on_error 351 // 352 // This function is called by fatal error handler when the thread 353 // causing troubles is a compiler thread. 354 // 355 // Do not grab any lock, do not allocate memory. 356 // 357 // Otherwise it's the same as CompileTask::print_line() 358 // 359 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 360 // print compiler name 361 st->print("%s:", CompileBroker::compiler_name(comp_level())); 362 print_compilation(st); 363 } 364 365 // ------------------------------------------------------------------ 366 // CompileTask::print_line 367 void CompileTask::print_line() { 368 ttyLocker ttyl; // keep the following output all in one block 369 // print compiler name if requested 370 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 371 print_compilation(); 372 } 373 374 375 // ------------------------------------------------------------------ 376 // CompileTask::print_compilation_impl 377 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 378 bool is_osr_method, int osr_bci, bool is_blocking, 379 const char* msg, bool short_form) { 380 if (!short_form) { 381 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 382 } 383 st->print("%4d ", compile_id); // print compilation number 384 385 // For unloaded methods the transition to zombie occurs after the 386 // method is cleared so it's impossible to report accurate 387 // information for that case. 388 bool is_synchronized = false; 389 bool has_exception_handler = false; 390 bool is_native = false; 391 if (method != NULL) { 392 is_synchronized = method->is_synchronized(); 393 has_exception_handler = method->has_exception_handler(); 394 is_native = method->is_native(); 395 } 396 // method attributes 397 const char compile_type = is_osr_method ? '%' : ' '; 398 const char sync_char = is_synchronized ? 's' : ' '; 399 const char exception_char = has_exception_handler ? '!' : ' '; 400 const char blocking_char = is_blocking ? 'b' : ' '; 401 const char native_char = is_native ? 'n' : ' '; 402 403 // print method attributes 404 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 405 406 if (TieredCompilation) { 407 if (comp_level != -1) st->print("%d ", comp_level); 408 else st->print("- "); 409 } 410 st->print(" "); // more indent 411 412 if (method == NULL) { 413 st->print("(method)"); 414 } else { 415 method->print_short_name(st); 416 if (is_osr_method) { 417 st->print(" @ %d", osr_bci); 418 } 419 if (method->is_native()) 420 st->print(" (native)"); 421 else 422 st->print(" (%d bytes)", method->code_size()); 423 } 424 425 if (msg != NULL) { 426 st->print(" %s", msg); 427 } 428 if (!short_form) { 429 st->cr(); 430 } 431 } 432 433 // ------------------------------------------------------------------ 434 // CompileTask::print_inlining 435 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 436 // 1234567 437 st->print(" "); // print timestamp 438 // 1234 439 st->print(" "); // print compilation number 440 441 // method attributes 442 if (method->is_loaded()) { 443 const char sync_char = method->is_synchronized() ? 's' : ' '; 444 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 445 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 446 447 // print method attributes 448 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 449 } else { 450 // %s!bn 451 st->print(" "); // print method attributes 452 } 453 454 if (TieredCompilation) { 455 st->print(" "); 456 } 457 st->print(" "); // more indent 458 st->print(" "); // initial inlining indent 459 460 for (int i = 0; i < inline_level; i++) st->print(" "); 461 462 st->print("@ %d ", bci); // print bci 463 method->print_short_name(st); 464 if (method->is_loaded()) 465 st->print(" (%d bytes)", method->code_size()); 466 else 467 st->print(" (not loaded)"); 468 469 if (msg != NULL) { 470 st->print(" %s", msg); 471 } 472 st->cr(); 473 } 474 475 // ------------------------------------------------------------------ 476 // CompileTask::print_inline_indent 477 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 478 // 1234567 479 st->print(" "); // print timestamp 480 // 1234 481 st->print(" "); // print compilation number 482 // %s!bn 483 st->print(" "); // print method attributes 484 if (TieredCompilation) { 485 st->print(" "); 486 } 487 st->print(" "); // more indent 488 st->print(" "); // initial inlining indent 489 for (int i = 0; i < inline_level; i++) st->print(" "); 490 } 491 492 // ------------------------------------------------------------------ 493 // CompileTask::print_compilation 494 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) { 495 bool is_osr_method = osr_bci() != InvocationEntryBci; 496 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form); 497 } 498 499 // ------------------------------------------------------------------ 500 // CompileTask::log_task 501 void CompileTask::log_task(xmlStream* log) { 502 Thread* thread = Thread::current(); 503 methodHandle method(thread, this->method()); 504 ResourceMark rm(thread); 505 506 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 507 log->print(" compile_id='%d'", _compile_id); 508 if (_osr_bci != CompileBroker::standard_entry_bci) { 509 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 510 } // else compile_kind='c2c' 511 if (!method.is_null()) log->method(method); 512 if (_osr_bci != CompileBroker::standard_entry_bci) { 513 log->print(" osr_bci='%d'", _osr_bci); 514 } 515 if (_comp_level != CompLevel_highest_tier) { 516 log->print(" level='%d'", _comp_level); 517 } 518 if (_is_blocking) { 519 log->print(" blocking='1'"); 520 } 521 log->stamp(); 522 } 523 524 525 // ------------------------------------------------------------------ 526 // CompileTask::log_task_queued 527 void CompileTask::log_task_queued() { 528 Thread* thread = Thread::current(); 529 ttyLocker ttyl; 530 ResourceMark rm(thread); 531 532 xtty->begin_elem("task_queued"); 533 log_task(xtty); 534 if (_comment != NULL) { 535 xtty->print(" comment='%s'", _comment); 536 } 537 if (_hot_method != NULL) { 538 methodHandle hot(thread, _hot_method); 539 methodHandle method(thread, _method); 540 if (hot() != method()) { 541 xtty->method(hot); 542 } 543 } 544 if (_hot_count != 0) { 545 xtty->print(" hot_count='%d'", _hot_count); 546 } 547 xtty->end_elem(); 548 } 549 550 551 // ------------------------------------------------------------------ 552 // CompileTask::log_task_start 553 void CompileTask::log_task_start(CompileLog* log) { 554 log->begin_head("task"); 555 log_task(log); 556 log->end_head(); 557 } 558 559 560 // ------------------------------------------------------------------ 561 // CompileTask::log_task_done 562 void CompileTask::log_task_done(CompileLog* log) { 563 Thread* thread = Thread::current(); 564 methodHandle method(thread, this->method()); 565 ResourceMark rm(thread); 566 567 // <task_done ... stamp='1.234'> </task> 568 nmethod* nm = code(); 569 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 570 _is_success, nm == NULL ? 0 : nm->content_size(), 571 method->invocation_count()); 572 int bec = method->backedge_count(); 573 if (bec != 0) log->print(" backedge_count='%d'", bec); 574 // Note: "_is_complete" is about to be set, but is not. 575 if (_num_inlined_bytecodes != 0) { 576 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 577 } 578 log->stamp(); 579 log->end_elem(); 580 log->tail("task"); 581 log->clear_identities(); // next task will have different CI 582 if (log->unflushed_count() > 2000) { 583 log->flush(); 584 } 585 log->mark_file_end(); 586 } 587 588 589 590 // Add a CompileTask to a CompileQueue 591 void CompileQueue::add(CompileTask* task) { 592 assert(lock()->owned_by_self(), "must own lock"); 593 594 task->set_next(NULL); 595 task->set_prev(NULL); 596 597 if (_last == NULL) { 598 // The compile queue is empty. 599 assert(_first == NULL, "queue is empty"); 600 _first = task; 601 _last = task; 602 } else { 603 // Append the task to the queue. 604 assert(_last->next() == NULL, "not last"); 605 _last->set_next(task); 606 task->set_prev(_last); 607 _last = task; 608 } 609 ++_size; 610 611 // Mark the method as being in the compile queue. 612 task->method()->set_queued_for_compilation(); 613 614 if (CIPrintCompileQueue) { 615 print(); 616 } 617 618 if (LogCompilation && xtty != NULL) { 619 task->log_task_queued(); 620 } 621 622 // Notify CompilerThreads that a task is available. 623 lock()->notify_all(); 624 } 625 626 void CompileQueue::delete_all() { 627 assert(lock()->owned_by_self(), "must own lock"); 628 if (_first != NULL) { 629 for (CompileTask* task = _first; task != NULL; task = task->next()) { 630 delete task; 631 } 632 _first = NULL; 633 } 634 } 635 636 // ------------------------------------------------------------------ 637 // CompileQueue::get 638 // 639 // Get the next CompileTask from a CompileQueue 640 CompileTask* CompileQueue::get() { 641 NMethodSweeper::possibly_sweep(); 642 643 MutexLocker locker(lock()); 644 // If _first is NULL we have no more compile jobs. There are two reasons for 645 // having no compile jobs: First, we compiled everything we wanted. Second, 646 // we ran out of code cache so compilation has been disabled. In the latter 647 // case we perform code cache sweeps to free memory such that we can re-enable 648 // compilation. 649 while (_first == NULL) { 650 // Exit loop if compilation is disabled forever 651 if (CompileBroker::is_compilation_disabled_forever()) { 652 return NULL; 653 } 654 655 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 656 // Wait a certain amount of time to possibly do another sweep. 657 // We must wait until stack scanning has happened so that we can 658 // transition a method's state from 'not_entrant' to 'zombie'. 659 long wait_time = NmethodSweepCheckInterval * 1000; 660 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 661 // Only one thread at a time can do sweeping. Scale the 662 // wait time according to the number of compiler threads. 663 // As a result, the next sweep is likely to happen every 100ms 664 // with an arbitrary number of threads that do sweeping. 665 wait_time = 100 * CICompilerCount; 666 } 667 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 668 if (timeout) { 669 MutexUnlocker ul(lock()); 670 NMethodSweeper::possibly_sweep(); 671 } 672 } else { 673 // If there are no compilation tasks and we can compile new jobs 674 // (i.e., there is enough free space in the code cache) there is 675 // no need to invoke the sweeper. As a result, the hotness of methods 676 // remains unchanged. This behavior is desired, since we want to keep 677 // the stable state, i.e., we do not want to evict methods from the 678 // code cache if it is unnecessary. 679 // We need a timed wait here, since compiler threads can exit if compilation 680 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 681 // is not critical and we do not want idle compiler threads to wake up too often. 682 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 683 } 684 } 685 686 if (CompileBroker::is_compilation_disabled_forever()) { 687 return NULL; 688 } 689 690 CompileTask* task = CompilationPolicy::policy()->select_task(this); 691 remove(task); 692 return task; 693 } 694 695 void CompileQueue::remove(CompileTask* task) 696 { 697 assert(lock()->owned_by_self(), "must own lock"); 698 if (task->prev() != NULL) { 699 task->prev()->set_next(task->next()); 700 } else { 701 // max is the first element 702 assert(task == _first, "Sanity"); 703 _first = task->next(); 704 } 705 706 if (task->next() != NULL) { 707 task->next()->set_prev(task->prev()); 708 } else { 709 // max is the last element 710 assert(task == _last, "Sanity"); 711 _last = task->prev(); 712 } 713 --_size; 714 } 715 716 // methods in the compile queue need to be marked as used on the stack 717 // so that they don't get reclaimed by Redefine Classes 718 void CompileQueue::mark_on_stack() { 719 CompileTask* task = _first; 720 while (task != NULL) { 721 task->mark_on_stack(); 722 task = task->next(); 723 } 724 } 725 726 // ------------------------------------------------------------------ 727 // CompileQueue::print 728 void CompileQueue::print() { 729 tty->print_cr("Contents of %s", name()); 730 tty->print_cr("----------------------"); 731 CompileTask* task = _first; 732 while (task != NULL) { 733 task->print_line(); 734 task = task->next(); 735 } 736 tty->print_cr("----------------------"); 737 } 738 739 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 740 741 _current_method[0] = '\0'; 742 _compile_type = CompileBroker::no_compile; 743 744 if (UsePerfData) { 745 ResourceMark rm; 746 747 // create the thread instance name space string - don't create an 748 // instance subspace if instance is -1 - keeps the adapterThread 749 // counters from having a ".0" namespace. 750 const char* thread_i = (instance == -1) ? thread_name : 751 PerfDataManager::name_space(thread_name, instance); 752 753 754 char* name = PerfDataManager::counter_name(thread_i, "method"); 755 _perf_current_method = 756 PerfDataManager::create_string_variable(SUN_CI, name, 757 cmname_buffer_length, 758 _current_method, CHECK); 759 760 name = PerfDataManager::counter_name(thread_i, "type"); 761 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 762 PerfData::U_None, 763 (jlong)_compile_type, 764 CHECK); 765 766 name = PerfDataManager::counter_name(thread_i, "time"); 767 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 768 PerfData::U_Ticks, CHECK); 769 770 name = PerfDataManager::counter_name(thread_i, "compiles"); 771 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 772 PerfData::U_Events, CHECK); 773 } 774 } 775 776 // ------------------------------------------------------------------ 777 // CompileBroker::compilation_init 778 // 779 // Initialize the Compilation object 780 void CompileBroker::compilation_init() { 781 _last_method_compiled[0] = '\0'; 782 783 // No need to initialize compilation system if we do not use it. 784 if (!UseCompiler) { 785 return; 786 } 787 #ifndef SHARK 788 // Set the interface to the current compiler(s). 789 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 790 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 791 #ifdef COMPILER1 792 if (c1_count > 0) { 793 _compilers[0] = new Compiler(); 794 } 795 #endif // COMPILER1 796 797 #ifdef COMPILER2 798 if (c2_count > 0) { 799 _compilers[1] = new C2Compiler(); 800 } 801 #endif // COMPILER2 802 803 #else // SHARK 804 int c1_count = 0; 805 int c2_count = 1; 806 807 _compilers[1] = new SharkCompiler(); 808 #endif // SHARK 809 810 // Initialize the CompileTask free list 811 _task_free_list = NULL; 812 813 // Start the CompilerThreads 814 init_compiler_threads(c1_count, c2_count); 815 // totalTime performance counter is always created as it is required 816 // by the implementation of java.lang.management.CompilationMBean. 817 { 818 EXCEPTION_MARK; 819 _perf_total_compilation = 820 PerfDataManager::create_counter(JAVA_CI, "totalTime", 821 PerfData::U_Ticks, CHECK); 822 } 823 824 825 if (UsePerfData) { 826 827 EXCEPTION_MARK; 828 829 // create the jvmstat performance counters 830 _perf_osr_compilation = 831 PerfDataManager::create_counter(SUN_CI, "osrTime", 832 PerfData::U_Ticks, CHECK); 833 834 _perf_standard_compilation = 835 PerfDataManager::create_counter(SUN_CI, "standardTime", 836 PerfData::U_Ticks, CHECK); 837 838 _perf_total_bailout_count = 839 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 840 PerfData::U_Events, CHECK); 841 842 _perf_total_invalidated_count = 843 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 844 PerfData::U_Events, CHECK); 845 846 _perf_total_compile_count = 847 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 848 PerfData::U_Events, CHECK); 849 _perf_total_osr_compile_count = 850 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 851 PerfData::U_Events, CHECK); 852 853 _perf_total_standard_compile_count = 854 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 855 PerfData::U_Events, CHECK); 856 857 _perf_sum_osr_bytes_compiled = 858 PerfDataManager::create_counter(SUN_CI, "osrBytes", 859 PerfData::U_Bytes, CHECK); 860 861 _perf_sum_standard_bytes_compiled = 862 PerfDataManager::create_counter(SUN_CI, "standardBytes", 863 PerfData::U_Bytes, CHECK); 864 865 _perf_sum_nmethod_size = 866 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 867 PerfData::U_Bytes, CHECK); 868 869 _perf_sum_nmethod_code_size = 870 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 871 PerfData::U_Bytes, CHECK); 872 873 _perf_last_method = 874 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 875 CompilerCounters::cmname_buffer_length, 876 "", CHECK); 877 878 _perf_last_failed_method = 879 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 880 CompilerCounters::cmname_buffer_length, 881 "", CHECK); 882 883 _perf_last_invalidated_method = 884 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 885 CompilerCounters::cmname_buffer_length, 886 "", CHECK); 887 888 _perf_last_compile_type = 889 PerfDataManager::create_variable(SUN_CI, "lastType", 890 PerfData::U_None, 891 (jlong)CompileBroker::no_compile, 892 CHECK); 893 894 _perf_last_compile_size = 895 PerfDataManager::create_variable(SUN_CI, "lastSize", 896 PerfData::U_Bytes, 897 (jlong)CompileBroker::no_compile, 898 CHECK); 899 900 901 _perf_last_failed_type = 902 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 903 PerfData::U_None, 904 (jlong)CompileBroker::no_compile, 905 CHECK); 906 907 _perf_last_invalidated_type = 908 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 909 PerfData::U_None, 910 (jlong)CompileBroker::no_compile, 911 CHECK); 912 } 913 914 _initialized = true; 915 } 916 917 918 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 919 AbstractCompiler* comp, TRAPS) { 920 CompilerThread* compiler_thread = NULL; 921 922 Klass* k = 923 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 924 true, CHECK_0); 925 instanceKlassHandle klass (THREAD, k); 926 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 927 Handle string = java_lang_String::create_from_str(name, CHECK_0); 928 929 // Initialize thread_oop to put it into the system threadGroup 930 Handle thread_group (THREAD, Universe::system_thread_group()); 931 JavaValue result(T_VOID); 932 JavaCalls::call_special(&result, thread_oop, 933 klass, 934 vmSymbols::object_initializer_name(), 935 vmSymbols::threadgroup_string_void_signature(), 936 thread_group, 937 string, 938 CHECK_0); 939 940 { 941 MutexLocker mu(Threads_lock, THREAD); 942 compiler_thread = new CompilerThread(queue, counters); 943 // At this point the new CompilerThread data-races with this startup 944 // thread (which I believe is the primoridal thread and NOT the VM 945 // thread). This means Java bytecodes being executed at startup can 946 // queue compile jobs which will run at whatever default priority the 947 // newly created CompilerThread runs at. 948 949 950 // At this point it may be possible that no osthread was created for the 951 // JavaThread due to lack of memory. We would have to throw an exception 952 // in that case. However, since this must work and we do not allow 953 // exceptions anyway, check and abort if this fails. 954 955 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 956 vm_exit_during_initialization("java.lang.OutOfMemoryError", 957 "unable to create new native thread"); 958 } 959 960 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 961 962 // Note that this only sets the JavaThread _priority field, which by 963 // definition is limited to Java priorities and not OS priorities. 964 // The os-priority is set in the CompilerThread startup code itself 965 966 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 967 968 // Note that we cannot call os::set_priority because it expects Java 969 // priorities and we are *explicitly* using OS priorities so that it's 970 // possible to set the compiler thread priority higher than any Java 971 // thread. 972 973 int native_prio = CompilerThreadPriority; 974 if (native_prio == -1) { 975 if (UseCriticalCompilerThreadPriority) { 976 native_prio = os::java_to_os_priority[CriticalPriority]; 977 } else { 978 native_prio = os::java_to_os_priority[NearMaxPriority]; 979 } 980 } 981 os::set_native_priority(compiler_thread, native_prio); 982 983 java_lang_Thread::set_daemon(thread_oop()); 984 985 compiler_thread->set_threadObj(thread_oop()); 986 compiler_thread->set_compiler(comp); 987 Threads::add(compiler_thread); 988 Thread::start(compiler_thread); 989 } 990 991 // Let go of Threads_lock before yielding 992 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 993 994 return compiler_thread; 995 } 996 997 998 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 999 EXCEPTION_MARK; 1000 #if !defined(ZERO) && !defined(SHARK) 1001 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1002 #endif // !ZERO && !SHARK 1003 // Initialize the compilation queue 1004 if (c2_compiler_count > 0) { 1005 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock); 1006 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1007 } 1008 if (c1_compiler_count > 0) { 1009 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock); 1010 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1011 } 1012 1013 int compiler_count = c1_compiler_count + c2_compiler_count; 1014 1015 _compiler_threads = 1016 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1017 1018 char name_buffer[256]; 1019 for (int i = 0; i < c2_compiler_count; i++) { 1020 // Create a name for our thread. 1021 sprintf(name_buffer, "C2 CompilerThread%d", i); 1022 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1023 // Shark and C2 1024 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK); 1025 _compiler_threads->append(new_thread); 1026 } 1027 1028 for (int i = c2_compiler_count; i < compiler_count; i++) { 1029 // Create a name for our thread. 1030 sprintf(name_buffer, "C1 CompilerThread%d", i); 1031 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1032 // C1 1033 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK); 1034 _compiler_threads->append(new_thread); 1035 } 1036 1037 if (UsePerfData) { 1038 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1039 } 1040 } 1041 1042 1043 // Set the methods on the stack as on_stack so that redefine classes doesn't 1044 // reclaim them 1045 void CompileBroker::mark_on_stack() { 1046 if (_c2_method_queue != NULL) { 1047 _c2_method_queue->mark_on_stack(); 1048 } 1049 if (_c1_method_queue != NULL) { 1050 _c1_method_queue->mark_on_stack(); 1051 } 1052 } 1053 1054 // ------------------------------------------------------------------ 1055 // CompileBroker::compile_method 1056 // 1057 // Request compilation of a method. 1058 void CompileBroker::compile_method_base(methodHandle method, 1059 int osr_bci, 1060 int comp_level, 1061 methodHandle hot_method, 1062 int hot_count, 1063 const char* comment, 1064 Thread* thread) { 1065 // do nothing if compiler thread(s) is not available 1066 if (!_initialized ) { 1067 return; 1068 } 1069 1070 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1071 assert(method->method_holder()->oop_is_instance(), 1072 "sanity check"); 1073 assert(!method->method_holder()->is_not_initialized(), 1074 "method holder must be initialized"); 1075 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1076 1077 if (CIPrintRequests) { 1078 tty->print("request: "); 1079 method->print_short_name(tty); 1080 if (osr_bci != InvocationEntryBci) { 1081 tty->print(" osr_bci: %d", osr_bci); 1082 } 1083 tty->print(" comment: %s count: %d", comment, hot_count); 1084 if (!hot_method.is_null()) { 1085 tty->print(" hot: "); 1086 if (hot_method() != method()) { 1087 hot_method->print_short_name(tty); 1088 } else { 1089 tty->print("yes"); 1090 } 1091 } 1092 tty->cr(); 1093 } 1094 1095 // A request has been made for compilation. Before we do any 1096 // real work, check to see if the method has been compiled 1097 // in the meantime with a definitive result. 1098 if (compilation_is_complete(method, osr_bci, comp_level)) { 1099 return; 1100 } 1101 1102 #ifndef PRODUCT 1103 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1104 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1105 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1106 return; 1107 } 1108 } 1109 #endif 1110 1111 // If this method is already in the compile queue, then 1112 // we do not block the current thread. 1113 if (compilation_is_in_queue(method, osr_bci)) { 1114 // We may want to decay our counter a bit here to prevent 1115 // multiple denied requests for compilation. This is an 1116 // open compilation policy issue. Note: The other possibility, 1117 // in the case that this is a blocking compile request, is to have 1118 // all subsequent blocking requesters wait for completion of 1119 // ongoing compiles. Note that in this case we'll need a protocol 1120 // for freeing the associated compile tasks. [Or we could have 1121 // a single static monitor on which all these waiters sleep.] 1122 return; 1123 } 1124 1125 // If the requesting thread is holding the pending list lock 1126 // then we just return. We can't risk blocking while holding 1127 // the pending list lock or a 3-way deadlock may occur 1128 // between the reference handler thread, a GC (instigated 1129 // by a compiler thread), and compiled method registration. 1130 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1131 return; 1132 } 1133 1134 // Outputs from the following MutexLocker block: 1135 CompileTask* task = NULL; 1136 bool blocking = false; 1137 CompileQueue* queue = compile_queue(comp_level); 1138 1139 // Acquire our lock. 1140 { 1141 MutexLocker locker(queue->lock(), thread); 1142 1143 // Make sure the method has not slipped into the queues since 1144 // last we checked; note that those checks were "fast bail-outs". 1145 // Here we need to be more careful, see 14012000 below. 1146 if (compilation_is_in_queue(method, osr_bci)) { 1147 return; 1148 } 1149 1150 // We need to check again to see if the compilation has 1151 // completed. A previous compilation may have registered 1152 // some result. 1153 if (compilation_is_complete(method, osr_bci, comp_level)) { 1154 return; 1155 } 1156 1157 // We now know that this compilation is not pending, complete, 1158 // or prohibited. Assign a compile_id to this compilation 1159 // and check to see if it is in our [Start..Stop) range. 1160 uint compile_id = assign_compile_id(method, osr_bci); 1161 if (compile_id == 0) { 1162 // The compilation falls outside the allowed range. 1163 return; 1164 } 1165 1166 // Should this thread wait for completion of the compile? 1167 blocking = is_compile_blocking(method, osr_bci); 1168 1169 // We will enter the compilation in the queue. 1170 // 14012000: Note that this sets the queued_for_compile bits in 1171 // the target method. We can now reason that a method cannot be 1172 // queued for compilation more than once, as follows: 1173 // Before a thread queues a task for compilation, it first acquires 1174 // the compile queue lock, then checks if the method's queued bits 1175 // are set or it has already been compiled. Thus there can not be two 1176 // instances of a compilation task for the same method on the 1177 // compilation queue. Consider now the case where the compilation 1178 // thread has already removed a task for that method from the queue 1179 // and is in the midst of compiling it. In this case, the 1180 // queued_for_compile bits must be set in the method (and these 1181 // will be visible to the current thread, since the bits were set 1182 // under protection of the compile queue lock, which we hold now. 1183 // When the compilation completes, the compiler thread first sets 1184 // the compilation result and then clears the queued_for_compile 1185 // bits. Neither of these actions are protected by a barrier (or done 1186 // under the protection of a lock), so the only guarantee we have 1187 // (on machines with TSO (Total Store Order)) is that these values 1188 // will update in that order. As a result, the only combinations of 1189 // these bits that the current thread will see are, in temporal order: 1190 // <RESULT, QUEUE> : 1191 // <0, 1> : in compile queue, but not yet compiled 1192 // <1, 1> : compiled but queue bit not cleared 1193 // <1, 0> : compiled and queue bit cleared 1194 // Because we first check the queue bits then check the result bits, 1195 // we are assured that we cannot introduce a duplicate task. 1196 // Note that if we did the tests in the reverse order (i.e. check 1197 // result then check queued bit), we could get the result bit before 1198 // the compilation completed, and the queue bit after the compilation 1199 // completed, and end up introducing a "duplicate" (redundant) task. 1200 // In that case, the compiler thread should first check if a method 1201 // has already been compiled before trying to compile it. 1202 // NOTE: in the event that there are multiple compiler threads and 1203 // there is de-optimization/recompilation, things will get hairy, 1204 // and in that case it's best to protect both the testing (here) of 1205 // these bits, and their updating (here and elsewhere) under a 1206 // common lock. 1207 task = create_compile_task(queue, 1208 compile_id, method, 1209 osr_bci, comp_level, 1210 hot_method, hot_count, comment, 1211 blocking); 1212 } 1213 1214 if (blocking) { 1215 wait_for_completion(task); 1216 } 1217 } 1218 1219 1220 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1221 int comp_level, 1222 methodHandle hot_method, int hot_count, 1223 const char* comment, Thread* THREAD) { 1224 // make sure arguments make sense 1225 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1226 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1227 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1228 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1229 // allow any levels for WhiteBox 1230 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1231 // return quickly if possible 1232 1233 // lock, make sure that the compilation 1234 // isn't prohibited in a straightforward way. 1235 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1236 if (comp == NULL || !comp->can_compile_method(method) || 1237 compilation_is_prohibited(method, osr_bci, comp_level)) { 1238 return NULL; 1239 } 1240 1241 if (osr_bci == InvocationEntryBci) { 1242 // standard compilation 1243 nmethod* method_code = method->code(); 1244 if (method_code != NULL) { 1245 if (compilation_is_complete(method, osr_bci, comp_level)) { 1246 return method_code; 1247 } 1248 } 1249 if (method->is_not_compilable(comp_level)) { 1250 return NULL; 1251 } 1252 } else { 1253 // osr compilation 1254 #ifndef TIERED 1255 // seems like an assert of dubious value 1256 assert(comp_level == CompLevel_highest_tier, 1257 "all OSR compiles are assumed to be at a single compilation lavel"); 1258 #endif // TIERED 1259 // We accept a higher level osr method 1260 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1261 if (nm != NULL) return nm; 1262 if (method->is_not_osr_compilable(comp_level)) return NULL; 1263 } 1264 1265 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1266 // some prerequisites that are compiler specific 1267 if (comp->is_c2() || comp->is_shark()) { 1268 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1269 // Resolve all classes seen in the signature of the method 1270 // we are compiling. 1271 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1272 } 1273 1274 // If the method is native, do the lookup in the thread requesting 1275 // the compilation. Native lookups can load code, which is not 1276 // permitted during compilation. 1277 // 1278 // Note: A native method implies non-osr compilation which is 1279 // checked with an assertion at the entry of this method. 1280 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1281 bool in_base_library; 1282 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1283 if (HAS_PENDING_EXCEPTION) { 1284 // In case of an exception looking up the method, we just forget 1285 // about it. The interpreter will kick-in and throw the exception. 1286 method->set_not_compilable(); // implies is_not_osr_compilable() 1287 CLEAR_PENDING_EXCEPTION; 1288 return NULL; 1289 } 1290 assert(method->has_native_function(), "must have native code by now"); 1291 } 1292 1293 // RedefineClasses() has replaced this method; just return 1294 if (method->is_old()) { 1295 return NULL; 1296 } 1297 1298 // JVMTI -- post_compile_event requires jmethod_id() that may require 1299 // a lock the compiling thread can not acquire. Prefetch it here. 1300 if (JvmtiExport::should_post_compiled_method_load()) { 1301 method->jmethod_id(); 1302 } 1303 1304 // do the compilation 1305 if (method->is_native()) { 1306 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1307 // Acquire our lock. 1308 int compile_id; 1309 { 1310 MutexLocker locker(MethodCompileQueue_lock, THREAD); 1311 compile_id = assign_compile_id(method, standard_entry_bci); 1312 } 1313 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1314 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1315 // 1316 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1317 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1318 (void) AdapterHandlerLibrary::create_native_wrapper(method, compile_id); 1319 } else { 1320 return NULL; 1321 } 1322 } else { 1323 // If the compiler is shut off due to code cache getting full 1324 // fail out now so blocking compiles dont hang the java thread 1325 if (!should_compile_new_jobs()) { 1326 CompilationPolicy::policy()->delay_compilation(method()); 1327 return NULL; 1328 } 1329 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1330 } 1331 1332 // return requested nmethod 1333 // We accept a higher level osr method 1334 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1335 } 1336 1337 1338 // ------------------------------------------------------------------ 1339 // CompileBroker::compilation_is_complete 1340 // 1341 // See if compilation of this method is already complete. 1342 bool CompileBroker::compilation_is_complete(methodHandle method, 1343 int osr_bci, 1344 int comp_level) { 1345 bool is_osr = (osr_bci != standard_entry_bci); 1346 if (is_osr) { 1347 if (method->is_not_osr_compilable(comp_level)) { 1348 return true; 1349 } else { 1350 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1351 return (result != NULL); 1352 } 1353 } else { 1354 if (method->is_not_compilable(comp_level)) { 1355 return true; 1356 } else { 1357 nmethod* result = method->code(); 1358 if (result == NULL) return false; 1359 return comp_level == result->comp_level(); 1360 } 1361 } 1362 } 1363 1364 1365 // ------------------------------------------------------------------ 1366 // CompileBroker::compilation_is_in_queue 1367 // 1368 // See if this compilation is already requested. 1369 // 1370 // Implementation note: there is only a single "is in queue" bit 1371 // for each method. This means that the check below is overly 1372 // conservative in the sense that an osr compilation in the queue 1373 // will block a normal compilation from entering the queue (and vice 1374 // versa). This can be remedied by a full queue search to disambiguate 1375 // cases. If it is deemed profitible, this may be done. 1376 bool CompileBroker::compilation_is_in_queue(methodHandle method, 1377 int osr_bci) { 1378 return method->queued_for_compilation(); 1379 } 1380 1381 // ------------------------------------------------------------------ 1382 // CompileBroker::compilation_is_prohibited 1383 // 1384 // See if this compilation is not allowed. 1385 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1386 bool is_native = method->is_native(); 1387 // Some compilers may not support the compilation of natives. 1388 AbstractCompiler *comp = compiler(comp_level); 1389 if (is_native && 1390 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1391 method->set_not_compilable_quietly(comp_level); 1392 return true; 1393 } 1394 1395 bool is_osr = (osr_bci != standard_entry_bci); 1396 // Some compilers may not support on stack replacement. 1397 if (is_osr && 1398 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1399 method->set_not_osr_compilable(comp_level); 1400 return true; 1401 } 1402 1403 // The method may be explicitly excluded by the user. 1404 bool quietly; 1405 if (CompilerOracle::should_exclude(method, quietly)) { 1406 if (!quietly) { 1407 // This does not happen quietly... 1408 ResourceMark rm; 1409 tty->print("### Excluding %s:%s", 1410 method->is_native() ? "generation of native wrapper" : "compile", 1411 (method->is_static() ? " static" : "")); 1412 method->print_short_name(tty); 1413 tty->cr(); 1414 } 1415 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1416 } 1417 1418 return false; 1419 } 1420 1421 1422 // ------------------------------------------------------------------ 1423 // CompileBroker::assign_compile_id 1424 // 1425 // Assign a serialized id number to this compilation request. If the 1426 // number falls out of the allowed range, return a 0. OSR 1427 // compilations may be numbered separately from regular compilations 1428 // if certain debugging flags are used. 1429 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1430 assert(MethodCompileQueue_lock->owner() == Thread::current(), 1431 "must hold the compilation queue lock"); 1432 bool is_osr = (osr_bci != standard_entry_bci); 1433 uint id; 1434 if (CICountOSR && is_osr) { 1435 id = ++_osr_compilation_id; 1436 if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) { 1437 return id; 1438 } 1439 } else { 1440 id = ++_compilation_id; 1441 if ((uint)CIStart <= id && id < (uint)CIStop) { 1442 return id; 1443 } 1444 } 1445 1446 // Method was not in the appropriate compilation range. 1447 method->set_not_compilable_quietly(); 1448 return 0; 1449 } 1450 1451 1452 // ------------------------------------------------------------------ 1453 // CompileBroker::is_compile_blocking 1454 // 1455 // Should the current thread be blocked until this compilation request 1456 // has been fulfilled? 1457 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) { 1458 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1459 return !BackgroundCompilation; 1460 } 1461 1462 1463 // ------------------------------------------------------------------ 1464 // CompileBroker::preload_classes 1465 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1466 // Move this code over from c1_Compiler.cpp 1467 ShouldNotReachHere(); 1468 } 1469 1470 1471 // ------------------------------------------------------------------ 1472 // CompileBroker::create_compile_task 1473 // 1474 // Create a CompileTask object representing the current request for 1475 // compilation. Add this task to the queue. 1476 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1477 int compile_id, 1478 methodHandle method, 1479 int osr_bci, 1480 int comp_level, 1481 methodHandle hot_method, 1482 int hot_count, 1483 const char* comment, 1484 bool blocking) { 1485 CompileTask* new_task = allocate_task(); 1486 new_task->initialize(compile_id, method, osr_bci, comp_level, 1487 hot_method, hot_count, comment, 1488 blocking); 1489 queue->add(new_task); 1490 return new_task; 1491 } 1492 1493 1494 // ------------------------------------------------------------------ 1495 // CompileBroker::allocate_task 1496 // 1497 // Allocate a CompileTask, from the free list if possible. 1498 CompileTask* CompileBroker::allocate_task() { 1499 MutexLocker locker(CompileTaskAlloc_lock); 1500 CompileTask* task = NULL; 1501 if (_task_free_list != NULL) { 1502 task = _task_free_list; 1503 _task_free_list = task->next(); 1504 task->set_next(NULL); 1505 } else { 1506 task = new CompileTask(); 1507 task->set_next(NULL); 1508 } 1509 return task; 1510 } 1511 1512 1513 // ------------------------------------------------------------------ 1514 // CompileBroker::free_task 1515 // 1516 // Add a task to the free list. 1517 void CompileBroker::free_task(CompileTask* task) { 1518 MutexLocker locker(CompileTaskAlloc_lock); 1519 task->free(); 1520 task->set_next(_task_free_list); 1521 _task_free_list = task; 1522 } 1523 1524 1525 // ------------------------------------------------------------------ 1526 // CompileBroker::wait_for_completion 1527 // 1528 // Wait for the given method CompileTask to complete. 1529 void CompileBroker::wait_for_completion(CompileTask* task) { 1530 if (CIPrintCompileQueue) { 1531 tty->print_cr("BLOCKING FOR COMPILE"); 1532 } 1533 1534 assert(task->is_blocking(), "can only wait on blocking task"); 1535 1536 JavaThread *thread = JavaThread::current(); 1537 thread->set_blocked_on_compilation(true); 1538 1539 methodHandle method(thread, task->method()); 1540 { 1541 MutexLocker waiter(task->lock(), thread); 1542 1543 while (!task->is_complete()) 1544 task->lock()->wait(); 1545 } 1546 // It is harmless to check this status without the lock, because 1547 // completion is a stable property (until the task object is recycled). 1548 assert(task->is_complete(), "Compilation should have completed"); 1549 assert(task->code_handle() == NULL, "must be reset"); 1550 1551 thread->set_blocked_on_compilation(false); 1552 1553 // By convention, the waiter is responsible for recycling a 1554 // blocking CompileTask. Since there is only one waiter ever 1555 // waiting on a CompileTask, we know that no one else will 1556 // be using this CompileTask; we can free it. 1557 free_task(task); 1558 } 1559 1560 // Initialize compiler thread(s) + compiler object(s). The postcondition 1561 // of this function is that the compiler runtimes are initialized and that 1562 //compiler threads can start compiling. 1563 bool CompileBroker::init_compiler_runtime() { 1564 CompilerThread* thread = CompilerThread::current(); 1565 AbstractCompiler* comp = thread->compiler(); 1566 // Final sanity check - the compiler object must exist 1567 guarantee(comp != NULL, "Compiler object must exist"); 1568 1569 int system_dictionary_modification_counter; 1570 { 1571 MutexLocker locker(Compile_lock, thread); 1572 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1573 } 1574 1575 { 1576 // Must switch to native to allocate ci_env 1577 ThreadToNativeFromVM ttn(thread); 1578 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1579 // Cache Jvmti state 1580 ci_env.cache_jvmti_state(); 1581 // Cache DTrace flags 1582 ci_env.cache_dtrace_flags(); 1583 1584 // Switch back to VM state to do compiler initialization 1585 ThreadInVMfromNative tv(thread); 1586 ResetNoHandleMark rnhm; 1587 1588 1589 if (!comp->is_shark()) { 1590 // Perform per-thread and global initializations 1591 comp->initialize(); 1592 } 1593 } 1594 1595 if (comp->is_failed()) { 1596 disable_compilation_forever(); 1597 // If compiler initialization failed, no compiler thread that is specific to a 1598 // particular compiler runtime will ever start to compile methods. 1599 1600 shutdown_compiler_runtime(comp, thread); 1601 return false; 1602 } 1603 1604 // C1 specific check 1605 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1606 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1607 return false; 1608 } 1609 1610 return true; 1611 } 1612 1613 // If C1 and/or C2 initialization failed, we shut down all compilation. 1614 // We do this to keep things simple. This can be changed if it ever turns out to be 1615 // a problem. 1616 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1617 // Free buffer blob, if allocated 1618 if (thread->get_buffer_blob() != NULL) { 1619 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1620 CodeCache::free(thread->get_buffer_blob()); 1621 } 1622 1623 if (comp->should_perform_shutdown()) { 1624 // There are two reasons for shutting down the compiler 1625 // 1) compiler runtime initialization failed 1626 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1627 warning("Shutting down compiler %s (no space to run compilers)", comp->name()); 1628 1629 // Only one thread per compiler runtime object enters here 1630 // Set state to shut down 1631 comp->set_shut_down(); 1632 1633 MutexLocker mu(MethodCompileQueue_lock, thread); 1634 CompileQueue* queue; 1635 if (_c1_method_queue != NULL) { 1636 _c1_method_queue->delete_all(); 1637 queue = _c1_method_queue; 1638 _c1_method_queue = NULL; 1639 delete _c1_method_queue; 1640 } 1641 1642 if (_c2_method_queue != NULL) { 1643 _c2_method_queue->delete_all(); 1644 queue = _c2_method_queue; 1645 _c2_method_queue = NULL; 1646 delete _c2_method_queue; 1647 } 1648 1649 // We could delete compiler runtimes also. However, there are references to 1650 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1651 // fail. This can be done later if necessary. 1652 } 1653 } 1654 1655 // ------------------------------------------------------------------ 1656 // CompileBroker::compiler_thread_loop 1657 // 1658 // The main loop run by a CompilerThread. 1659 void CompileBroker::compiler_thread_loop() { 1660 CompilerThread* thread = CompilerThread::current(); 1661 CompileQueue* queue = thread->queue(); 1662 // For the thread that initializes the ciObjectFactory 1663 // this resource mark holds all the shared objects 1664 ResourceMark rm; 1665 1666 // First thread to get here will initialize the compiler interface 1667 1668 if (!ciObjectFactory::is_initialized()) { 1669 ASSERT_IN_VM; 1670 MutexLocker only_one (CompileThread_lock, thread); 1671 if (!ciObjectFactory::is_initialized()) { 1672 ciObjectFactory::initialize(); 1673 } 1674 } 1675 1676 // Open a log. 1677 if (LogCompilation) { 1678 init_compiler_thread_log(); 1679 } 1680 CompileLog* log = thread->log(); 1681 if (log != NULL) { 1682 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1683 thread->name(), 1684 os::current_thread_id(), 1685 os::current_process_id()); 1686 log->stamp(); 1687 log->end_elem(); 1688 } 1689 1690 // If compiler thread/runtime initialization fails, exit the compiler thread 1691 if (!init_compiler_runtime()) { 1692 return; 1693 } 1694 1695 // Poll for new compilation tasks as long as the JVM runs. Compilation 1696 // should only be disabled if something went wrong while initializing the 1697 // compiler runtimes. This, in turn, should not happen. The only known case 1698 // when compiler runtime initialization fails is if there is not enough free 1699 // space in the code cache to generate the necessary stubs, etc. 1700 while (!is_compilation_disabled_forever()) { 1701 // We need this HandleMark to avoid leaking VM handles. 1702 HandleMark hm(thread); 1703 1704 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1705 // the code cache is really full 1706 handle_full_code_cache(); 1707 } 1708 1709 CompileTask* task = queue->get(); 1710 if (task == NULL) { 1711 continue; 1712 } 1713 1714 // Give compiler threads an extra quanta. They tend to be bursty and 1715 // this helps the compiler to finish up the job. 1716 if( CompilerThreadHintNoPreempt ) 1717 os::hint_no_preempt(); 1718 1719 // trace per thread time and compile statistics 1720 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1721 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1722 1723 // Assign the task to the current thread. Mark this compilation 1724 // thread as active for the profiler. 1725 CompileTaskWrapper ctw(task); 1726 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1727 task->set_code_handle(&result_handle); 1728 methodHandle method(thread, task->method()); 1729 1730 // Never compile a method if breakpoints are present in it 1731 if (method()->number_of_breakpoints() == 0) { 1732 // Compile the method. 1733 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1734 #ifdef COMPILER1 1735 // Allow repeating compilations for the purpose of benchmarking 1736 // compile speed. This is not useful for customers. 1737 if (CompilationRepeat != 0) { 1738 int compile_count = CompilationRepeat; 1739 while (compile_count > 0) { 1740 invoke_compiler_on_method(task); 1741 nmethod* nm = method->code(); 1742 if (nm != NULL) { 1743 nm->make_zombie(); 1744 method->clear_code(); 1745 } 1746 compile_count--; 1747 } 1748 } 1749 #endif /* COMPILER1 */ 1750 invoke_compiler_on_method(task); 1751 } else { 1752 // After compilation is disabled, remove remaining methods from queue 1753 method->clear_queued_for_compilation(); 1754 } 1755 } 1756 } 1757 1758 // Shut down compiler runtime 1759 shutdown_compiler_runtime(thread->compiler(), thread); 1760 } 1761 1762 // ------------------------------------------------------------------ 1763 // CompileBroker::init_compiler_thread_log 1764 // 1765 // Set up state required by +LogCompilation. 1766 void CompileBroker::init_compiler_thread_log() { 1767 CompilerThread* thread = CompilerThread::current(); 1768 char file_name[4*K]; 1769 FILE* fp = NULL; 1770 intx thread_id = os::current_thread_id(); 1771 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1772 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1773 if (dir == NULL) { 1774 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1775 thread_id, os::current_process_id()); 1776 } else { 1777 jio_snprintf(file_name, sizeof(file_name), 1778 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1779 os::file_separator(), thread_id, os::current_process_id()); 1780 } 1781 1782 fp = fopen(file_name, "at"); 1783 if (fp != NULL) { 1784 if (LogCompilation && Verbose) { 1785 tty->print_cr("Opening compilation log %s", file_name); 1786 } 1787 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1788 thread->init_log(log); 1789 1790 if (xtty != NULL) { 1791 ttyLocker ttyl; 1792 // Record any per thread log files 1793 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name); 1794 } 1795 return; 1796 } 1797 } 1798 warning("Cannot open log file: %s", file_name); 1799 } 1800 1801 // ------------------------------------------------------------------ 1802 // CompileBroker::set_should_block 1803 // 1804 // Set _should_block. 1805 // Call this from the VM, with Threads_lock held and a safepoint requested. 1806 void CompileBroker::set_should_block() { 1807 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1808 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1809 #ifndef PRODUCT 1810 if (PrintCompilation && (Verbose || WizardMode)) 1811 tty->print_cr("notifying compiler thread pool to block"); 1812 #endif 1813 _should_block = true; 1814 } 1815 1816 // ------------------------------------------------------------------ 1817 // CompileBroker::maybe_block 1818 // 1819 // Call this from the compiler at convenient points, to poll for _should_block. 1820 void CompileBroker::maybe_block() { 1821 if (_should_block) { 1822 #ifndef PRODUCT 1823 if (PrintCompilation && (Verbose || WizardMode)) 1824 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current()); 1825 #endif 1826 ThreadInVMfromNative tivfn(JavaThread::current()); 1827 } 1828 } 1829 1830 // wrapper for CodeCache::print_summary() 1831 static void codecache_print(bool detailed) 1832 { 1833 ResourceMark rm; 1834 stringStream s; 1835 // Dump code cache into a buffer before locking the tty, 1836 { 1837 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1838 CodeCache::print_summary(&s, detailed); 1839 } 1840 ttyLocker ttyl; 1841 tty->print(s.as_string()); 1842 } 1843 1844 // ------------------------------------------------------------------ 1845 // CompileBroker::invoke_compiler_on_method 1846 // 1847 // Compile a method. 1848 // 1849 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1850 if (PrintCompilation) { 1851 ResourceMark rm; 1852 task->print_line(); 1853 } 1854 elapsedTimer time; 1855 1856 CompilerThread* thread = CompilerThread::current(); 1857 ResourceMark rm(thread); 1858 1859 if (LogEvents) { 1860 _compilation_log->log_compile(thread, task); 1861 } 1862 1863 // Common flags. 1864 uint compile_id = task->compile_id(); 1865 int osr_bci = task->osr_bci(); 1866 bool is_osr = (osr_bci != standard_entry_bci); 1867 bool should_log = (thread->log() != NULL); 1868 bool should_break = false; 1869 int task_level = task->comp_level(); 1870 { 1871 // create the handle inside it's own block so it can't 1872 // accidentally be referenced once the thread transitions to 1873 // native. The NoHandleMark before the transition should catch 1874 // any cases where this occurs in the future. 1875 methodHandle method(thread, task->method()); 1876 should_break = check_break_at(method, compile_id, is_osr); 1877 if (should_log && !CompilerOracle::should_log(method)) { 1878 should_log = false; 1879 } 1880 assert(!method->is_native(), "no longer compile natives"); 1881 1882 // Save information about this method in case of failure. 1883 set_last_compile(thread, method, is_osr, task_level); 1884 1885 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1886 } 1887 1888 // Allocate a new set of JNI handles. 1889 push_jni_handle_block(); 1890 Method* target_handle = task->method(); 1891 int compilable = ciEnv::MethodCompilable; 1892 { 1893 int system_dictionary_modification_counter; 1894 { 1895 MutexLocker locker(Compile_lock, thread); 1896 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1897 } 1898 1899 NoHandleMark nhm; 1900 ThreadToNativeFromVM ttn(thread); 1901 1902 ciEnv ci_env(task, system_dictionary_modification_counter); 1903 if (should_break) { 1904 ci_env.set_break_at_compile(true); 1905 } 1906 if (should_log) { 1907 ci_env.set_log(thread->log()); 1908 } 1909 assert(thread->env() == &ci_env, "set by ci_env"); 1910 // The thread-env() field is cleared in ~CompileTaskWrapper. 1911 1912 // Cache Jvmti state 1913 ci_env.cache_jvmti_state(); 1914 1915 // Cache DTrace flags 1916 ci_env.cache_dtrace_flags(); 1917 1918 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1919 1920 TraceTime t1("compilation", &time); 1921 EventCompilation event; 1922 1923 AbstractCompiler *comp = compiler(task_level); 1924 if (comp == NULL) { 1925 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1926 } else { 1927 comp->compile_method(&ci_env, target, osr_bci); 1928 } 1929 1930 if (!ci_env.failing() && task->code() == NULL) { 1931 //assert(false, "compiler should always document failure"); 1932 // The compiler elected, without comment, not to register a result. 1933 // Do not attempt further compilations of this method. 1934 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1935 } 1936 1937 // Copy this bit to the enclosing block: 1938 compilable = ci_env.compilable(); 1939 1940 if (ci_env.failing()) { 1941 const char* retry_message = ci_env.retry_message(); 1942 if (_compilation_log != NULL) { 1943 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1944 } 1945 if (PrintCompilation) { 1946 FormatBufferResource msg = retry_message != NULL ? 1947 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1948 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1949 task->print_compilation(tty, msg); 1950 } 1951 } else { 1952 task->mark_success(); 1953 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 1954 if (_compilation_log != NULL) { 1955 nmethod* code = task->code(); 1956 if (code != NULL) { 1957 _compilation_log->log_nmethod(thread, code); 1958 } 1959 } 1960 } 1961 // simulate crash during compilation 1962 assert(task->compile_id() != CICrashAt, "just as planned"); 1963 if (event.should_commit()) { 1964 event.set_method(target->get_Method()); 1965 event.set_compileID(compile_id); 1966 event.set_compileLevel(task->comp_level()); 1967 event.set_succeded(task->is_success()); 1968 event.set_isOsr(is_osr); 1969 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 1970 event.set_inlinedBytes(task->num_inlined_bytecodes()); 1971 event.commit(); 1972 } 1973 } 1974 pop_jni_handle_block(); 1975 1976 methodHandle method(thread, task->method()); 1977 1978 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 1979 1980 collect_statistics(thread, time, task); 1981 1982 if (PrintCompilation && PrintCompilation2) { 1983 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 1984 tty->print("%4d ", compile_id); // print compilation number 1985 tty->print("%s ", (is_osr ? "%" : " ")); 1986 if (task->code() != NULL) { 1987 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 1988 } 1989 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 1990 } 1991 1992 if (PrintCodeCacheOnCompilation) 1993 codecache_print(/* detailed= */ false); 1994 1995 // Disable compilation, if required. 1996 switch (compilable) { 1997 case ciEnv::MethodCompilable_never: 1998 if (is_osr) 1999 method->set_not_osr_compilable_quietly(); 2000 else 2001 method->set_not_compilable_quietly(); 2002 break; 2003 case ciEnv::MethodCompilable_not_at_tier: 2004 if (is_osr) 2005 method->set_not_osr_compilable_quietly(task_level); 2006 else 2007 method->set_not_compilable_quietly(task_level); 2008 break; 2009 } 2010 2011 // Note that the queued_for_compilation bits are cleared without 2012 // protection of a mutex. [They were set by the requester thread, 2013 // when adding the task to the complie queue -- at which time the 2014 // compile queue lock was held. Subsequently, we acquired the compile 2015 // queue lock to get this task off the compile queue; thus (to belabour 2016 // the point somewhat) our clearing of the bits must be occurring 2017 // only after the setting of the bits. See also 14012000 above. 2018 method->clear_queued_for_compilation(); 2019 2020 #ifdef ASSERT 2021 if (CollectedHeap::fired_fake_oom()) { 2022 // The current compile received a fake OOM during compilation so 2023 // go ahead and exit the VM since the test apparently succeeded 2024 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2025 vm_exit(0); 2026 } 2027 #endif 2028 } 2029 2030 // ------------------------------------------------------------------ 2031 // CompileBroker::handle_full_code_cache 2032 // 2033 // The CodeCache is full. Print out warning and disable compilation or 2034 // try code cache cleaning so compilation can continue later. 2035 void CompileBroker::handle_full_code_cache() { 2036 UseInterpreter = true; 2037 if (UseCompiler || AlwaysCompileLoopMethods ) { 2038 if (xtty != NULL) { 2039 ResourceMark rm; 2040 stringStream s; 2041 // Dump code cache state into a buffer before locking the tty, 2042 // because log_state() will use locks causing lock conflicts. 2043 CodeCache::log_state(&s); 2044 // Lock to prevent tearing 2045 ttyLocker ttyl; 2046 xtty->begin_elem("code_cache_full"); 2047 xtty->print(s.as_string()); 2048 xtty->stamp(); 2049 xtty->end_elem(); 2050 } 2051 warning("CodeCache is full. Compiler has been disabled."); 2052 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2053 2054 CodeCache::report_codemem_full(); 2055 2056 2057 #ifndef PRODUCT 2058 if (CompileTheWorld || ExitOnFullCodeCache) { 2059 codecache_print(/* detailed= */ true); 2060 before_exit(JavaThread::current()); 2061 exit_globals(); // will delete tty 2062 vm_direct_exit(CompileTheWorld ? 0 : 1); 2063 } 2064 #endif 2065 if (UseCodeCacheFlushing) { 2066 // Since code cache is full, immediately stop new compiles 2067 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2068 NMethodSweeper::log_sweep("disable_compiler"); 2069 2070 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2071 // without having to consider the state in which the current thread is. 2072 ThreadInVMfromUnknown in_vm; 2073 NMethodSweeper::possibly_sweep(); 2074 } 2075 } else { 2076 disable_compilation_forever(); 2077 } 2078 } 2079 codecache_print(/* detailed= */ true); 2080 } 2081 2082 // ------------------------------------------------------------------ 2083 // CompileBroker::set_last_compile 2084 // 2085 // Record this compilation for debugging purposes. 2086 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2087 ResourceMark rm; 2088 char* method_name = method->name()->as_C_string(); 2089 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2090 char current_method[CompilerCounters::cmname_buffer_length]; 2091 size_t maxLen = CompilerCounters::cmname_buffer_length; 2092 2093 if (UsePerfData) { 2094 const char* class_name = method->method_holder()->name()->as_C_string(); 2095 2096 size_t s1len = strlen(class_name); 2097 size_t s2len = strlen(method_name); 2098 2099 // check if we need to truncate the string 2100 if (s1len + s2len + 2 > maxLen) { 2101 2102 // the strategy is to lop off the leading characters of the 2103 // class name and the trailing characters of the method name. 2104 2105 if (s2len + 2 > maxLen) { 2106 // lop of the entire class name string, let snprintf handle 2107 // truncation of the method name. 2108 class_name += s1len; // null string 2109 } 2110 else { 2111 // lop off the extra characters from the front of the class name 2112 class_name += ((s1len + s2len + 2) - maxLen); 2113 } 2114 } 2115 2116 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2117 } 2118 2119 if (CICountOSR && is_osr) { 2120 _last_compile_type = osr_compile; 2121 } else { 2122 _last_compile_type = normal_compile; 2123 } 2124 _last_compile_level = comp_level; 2125 2126 if (UsePerfData) { 2127 CompilerCounters* counters = thread->counters(); 2128 counters->set_current_method(current_method); 2129 counters->set_compile_type((jlong)_last_compile_type); 2130 } 2131 } 2132 2133 2134 // ------------------------------------------------------------------ 2135 // CompileBroker::push_jni_handle_block 2136 // 2137 // Push on a new block of JNI handles. 2138 void CompileBroker::push_jni_handle_block() { 2139 JavaThread* thread = JavaThread::current(); 2140 2141 // Allocate a new block for JNI handles. 2142 // Inlined code from jni_PushLocalFrame() 2143 JNIHandleBlock* java_handles = thread->active_handles(); 2144 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2145 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2146 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2147 thread->set_active_handles(compile_handles); 2148 } 2149 2150 2151 // ------------------------------------------------------------------ 2152 // CompileBroker::pop_jni_handle_block 2153 // 2154 // Pop off the current block of JNI handles. 2155 void CompileBroker::pop_jni_handle_block() { 2156 JavaThread* thread = JavaThread::current(); 2157 2158 // Release our JNI handle block 2159 JNIHandleBlock* compile_handles = thread->active_handles(); 2160 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2161 thread->set_active_handles(java_handles); 2162 compile_handles->set_pop_frame_link(NULL); 2163 JNIHandleBlock::release_block(compile_handles, thread); // may block 2164 } 2165 2166 2167 // ------------------------------------------------------------------ 2168 // CompileBroker::check_break_at 2169 // 2170 // Should the compilation break at the current compilation. 2171 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2172 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2173 return true; 2174 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2175 return true; 2176 } else { 2177 return (compile_id == CIBreakAt); 2178 } 2179 } 2180 2181 // ------------------------------------------------------------------ 2182 // CompileBroker::collect_statistics 2183 // 2184 // Collect statistics about the compilation. 2185 2186 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2187 bool success = task->is_success(); 2188 methodHandle method (thread, task->method()); 2189 uint compile_id = task->compile_id(); 2190 bool is_osr = (task->osr_bci() != standard_entry_bci); 2191 nmethod* code = task->code(); 2192 CompilerCounters* counters = thread->counters(); 2193 2194 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2195 MutexLocker locker(CompileStatistics_lock); 2196 2197 // _perf variables are production performance counters which are 2198 // updated regardless of the setting of the CITime and CITimeEach flags 2199 // 2200 if (!success) { 2201 _total_bailout_count++; 2202 if (UsePerfData) { 2203 _perf_last_failed_method->set_value(counters->current_method()); 2204 _perf_last_failed_type->set_value(counters->compile_type()); 2205 _perf_total_bailout_count->inc(); 2206 } 2207 } else if (code == NULL) { 2208 if (UsePerfData) { 2209 _perf_last_invalidated_method->set_value(counters->current_method()); 2210 _perf_last_invalidated_type->set_value(counters->compile_type()); 2211 _perf_total_invalidated_count->inc(); 2212 } 2213 _total_invalidated_count++; 2214 } else { 2215 // Compilation succeeded 2216 2217 // update compilation ticks - used by the implementation of 2218 // java.lang.management.CompilationMBean 2219 _perf_total_compilation->inc(time.ticks()); 2220 2221 _t_total_compilation.add(time); 2222 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2223 2224 if (CITime) { 2225 if (is_osr) { 2226 _t_osr_compilation.add(time); 2227 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2228 } else { 2229 _t_standard_compilation.add(time); 2230 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2231 } 2232 } 2233 2234 if (UsePerfData) { 2235 // save the name of the last method compiled 2236 _perf_last_method->set_value(counters->current_method()); 2237 _perf_last_compile_type->set_value(counters->compile_type()); 2238 _perf_last_compile_size->set_value(method->code_size() + 2239 task->num_inlined_bytecodes()); 2240 if (is_osr) { 2241 _perf_osr_compilation->inc(time.ticks()); 2242 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2243 } else { 2244 _perf_standard_compilation->inc(time.ticks()); 2245 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2246 } 2247 } 2248 2249 if (CITimeEach) { 2250 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2251 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2252 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2253 } 2254 2255 // Collect counts of successful compilations 2256 _sum_nmethod_size += code->total_size(); 2257 _sum_nmethod_code_size += code->insts_size(); 2258 _total_compile_count++; 2259 2260 if (UsePerfData) { 2261 _perf_sum_nmethod_size->inc( code->total_size()); 2262 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2263 _perf_total_compile_count->inc(); 2264 } 2265 2266 if (is_osr) { 2267 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2268 _total_osr_compile_count++; 2269 } else { 2270 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2271 _total_standard_compile_count++; 2272 } 2273 } 2274 // set the current method for the thread to null 2275 if (UsePerfData) counters->set_current_method(""); 2276 } 2277 2278 const char* CompileBroker::compiler_name(int comp_level) { 2279 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2280 if (comp == NULL) { 2281 return "no compiler"; 2282 } else { 2283 return (comp->name()); 2284 } 2285 } 2286 2287 void CompileBroker::print_times() { 2288 tty->cr(); 2289 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2290 tty->print_cr("------------------------------------------------"); 2291 //0000000000111111111122222222223333333333444444444455555555556666666666 2292 //0123456789012345678901234567890123456789012345678901234567890123456789 2293 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2294 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2295 CompileBroker::_t_standard_compilation.seconds(), 2296 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2297 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); 2298 2299 AbstractCompiler *comp = compiler(CompLevel_simple); 2300 if (comp != NULL) { 2301 comp->print_timers(); 2302 } 2303 comp = compiler(CompLevel_full_optimization); 2304 if (comp != NULL) { 2305 comp->print_timers(); 2306 } 2307 tty->cr(); 2308 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2309 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2310 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2311 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2312 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2313 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2314 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2315 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2316 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2317 tty->cr(); 2318 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2319 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2320 } 2321 2322 // Debugging output for failure 2323 void CompileBroker::print_last_compile() { 2324 if ( _last_compile_level != CompLevel_none && 2325 compiler(_last_compile_level) != NULL && 2326 _last_method_compiled != NULL && 2327 _last_compile_type != no_compile) { 2328 if (_last_compile_type == osr_compile) { 2329 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2330 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2331 } else { 2332 tty->print_cr("Last parse: %d+++(%d) %s", 2333 _compilation_id, _last_compile_level, _last_method_compiled); 2334 } 2335 } 2336 } 2337 2338 2339 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2340 #ifndef PRODUCT 2341 st->print_cr("Compiler thread printing unimplemented."); 2342 st->cr(); 2343 #endif 2344 }