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 (char *) 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 (char *) 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::_print_compilation_warning = 0; 130 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 131 132 // The installed compiler(s) 133 AbstractCompiler* CompileBroker::_compilers[2]; 134 135 // These counters are used to assign an unique ID to each compilation. 136 volatile jint CompileBroker::_compilation_id = 0; 137 volatile jint CompileBroker::_osr_compilation_id = 0; 138 139 // Debugging information 140 int CompileBroker::_last_compile_type = no_compile; 141 int CompileBroker::_last_compile_level = CompLevel_none; 142 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 143 144 // Performance counters 145 PerfCounter* CompileBroker::_perf_total_compilation = NULL; 146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL; 147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL; 148 149 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL; 150 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 151 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 152 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 153 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 154 155 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 156 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 157 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 158 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 159 160 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 161 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 162 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 163 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 164 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 165 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 166 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 167 168 // Timers and counters for generating statistics 169 elapsedTimer CompileBroker::_t_total_compilation; 170 elapsedTimer CompileBroker::_t_osr_compilation; 171 elapsedTimer CompileBroker::_t_standard_compilation; 172 173 int CompileBroker::_total_bailout_count = 0; 174 int CompileBroker::_total_invalidated_count = 0; 175 int CompileBroker::_total_compile_count = 0; 176 int CompileBroker::_total_osr_compile_count = 0; 177 int CompileBroker::_total_standard_compile_count = 0; 178 179 int CompileBroker::_sum_osr_bytes_compiled = 0; 180 int CompileBroker::_sum_standard_bytes_compiled = 0; 181 int CompileBroker::_sum_nmethod_size = 0; 182 int CompileBroker::_sum_nmethod_code_size = 0; 183 184 long CompileBroker::_peak_compilation_time = 0; 185 186 CompileQueue* CompileBroker::_c2_method_queue = NULL; 187 CompileQueue* CompileBroker::_c1_method_queue = NULL; 188 CompileTask* CompileBroker::_task_free_list = NULL; 189 190 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL; 191 192 193 class CompilationLog : public StringEventLog { 194 public: 195 CompilationLog() : StringEventLog("Compilation events") { 196 } 197 198 void log_compile(JavaThread* thread, CompileTask* task) { 199 StringLogMessage lm; 200 stringStream sstr = lm.stream(); 201 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 202 task->print_compilation(&sstr, NULL, true); 203 log(thread, "%s", (const char*)lm); 204 } 205 206 void log_nmethod(JavaThread* thread, nmethod* nm) { 207 log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]", 208 nm->compile_id(), nm->is_osr_method() ? "%" : "", 209 nm, nm->code_begin(), nm->code_end()); 210 } 211 212 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 213 StringLogMessage lm; 214 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 215 if (retry_message != NULL) { 216 lm.append(" (%s)", retry_message); 217 } 218 lm.print("\n"); 219 log(thread, "%s", (const char*)lm); 220 } 221 }; 222 223 static CompilationLog* _compilation_log = NULL; 224 225 void compileBroker_init() { 226 if (LogEvents) { 227 _compilation_log = new CompilationLog(); 228 } 229 } 230 231 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 232 CompilerThread* thread = CompilerThread::current(); 233 thread->set_task(task); 234 CompileLog* log = thread->log(); 235 if (log != NULL) task->log_task_start(log); 236 } 237 238 CompileTaskWrapper::~CompileTaskWrapper() { 239 CompilerThread* thread = CompilerThread::current(); 240 CompileTask* task = thread->task(); 241 CompileLog* log = thread->log(); 242 if (log != NULL) task->log_task_done(log); 243 thread->set_task(NULL); 244 task->set_code_handle(NULL); 245 thread->set_env(NULL); 246 if (task->is_blocking()) { 247 MutexLocker notifier(task->lock(), thread); 248 task->mark_complete(); 249 // Notify the waiting thread that the compilation has completed. 250 task->lock()->notify_all(); 251 } else { 252 task->mark_complete(); 253 254 // By convention, the compiling thread is responsible for 255 // recycling a non-blocking CompileTask. 256 CompileBroker::free_task(task); 257 } 258 } 259 260 261 // ------------------------------------------------------------------ 262 // CompileTask::initialize 263 void CompileTask::initialize(int compile_id, 264 methodHandle method, 265 int osr_bci, 266 int comp_level, 267 methodHandle hot_method, 268 int hot_count, 269 const char* comment, 270 bool is_blocking) { 271 assert(!_lock->is_locked(), "bad locking"); 272 273 _compile_id = compile_id; 274 _method = method(); 275 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 276 _osr_bci = osr_bci; 277 _is_blocking = is_blocking; 278 _comp_level = comp_level; 279 _num_inlined_bytecodes = 0; 280 281 _is_complete = false; 282 _is_success = false; 283 _code_handle = NULL; 284 285 _hot_method = NULL; 286 _hot_method_holder = NULL; 287 _hot_count = hot_count; 288 _time_queued = 0; // tidy 289 _comment = comment; 290 291 if (LogCompilation) { 292 _time_queued = os::elapsed_counter(); 293 if (hot_method.not_null()) { 294 if (hot_method == method) { 295 _hot_method = _method; 296 } else { 297 _hot_method = hot_method(); 298 // only add loader or mirror if different from _method_holder 299 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 300 } 301 } 302 } 303 304 _next = NULL; 305 } 306 307 // ------------------------------------------------------------------ 308 // CompileTask::code/set_code 309 nmethod* CompileTask::code() const { 310 if (_code_handle == NULL) return NULL; 311 return _code_handle->code(); 312 } 313 void CompileTask::set_code(nmethod* nm) { 314 if (_code_handle == NULL && nm == NULL) return; 315 guarantee(_code_handle != NULL, ""); 316 _code_handle->set_code(nm); 317 if (nm == NULL) _code_handle = NULL; // drop the handle also 318 } 319 320 // ------------------------------------------------------------------ 321 // CompileTask::free 322 void CompileTask::free() { 323 set_code(NULL); 324 assert(!_lock->is_locked(), "Should not be locked when freed"); 325 JNIHandles::destroy_global(_method_holder); 326 JNIHandles::destroy_global(_hot_method_holder); 327 } 328 329 330 void CompileTask::mark_on_stack() { 331 // Mark these methods as something redefine classes cannot remove. 332 _method->set_on_stack(true); 333 if (_hot_method != NULL) { 334 _hot_method->set_on_stack(true); 335 } 336 } 337 338 // ------------------------------------------------------------------ 339 // CompileTask::print 340 void CompileTask::print() { 341 tty->print("<CompileTask compile_id=%d ", _compile_id); 342 tty->print("method="); 343 _method->print_name(tty); 344 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>", 345 _osr_bci, bool_to_str(_is_blocking), 346 bool_to_str(_is_complete), bool_to_str(_is_success)); 347 } 348 349 350 // ------------------------------------------------------------------ 351 // CompileTask::print_line_on_error 352 // 353 // This function is called by fatal error handler when the thread 354 // causing troubles is a compiler thread. 355 // 356 // Do not grab any lock, do not allocate memory. 357 // 358 // Otherwise it's the same as CompileTask::print_line() 359 // 360 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 361 // print compiler name 362 st->print("%s:", CompileBroker::compiler_name(comp_level())); 363 print_compilation(st); 364 } 365 366 // ------------------------------------------------------------------ 367 // CompileTask::print_line 368 void CompileTask::print_line() { 369 ttyLocker ttyl; // keep the following output all in one block 370 // print compiler name if requested 371 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 372 print_compilation(); 373 } 374 375 376 // ------------------------------------------------------------------ 377 // CompileTask::print_compilation_impl 378 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 379 bool is_osr_method, int osr_bci, bool is_blocking, 380 const char* msg, bool short_form) { 381 if (!short_form) { 382 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 383 } 384 st->print("%4d ", compile_id); // print compilation number 385 386 // For unloaded methods the transition to zombie occurs after the 387 // method is cleared so it's impossible to report accurate 388 // information for that case. 389 bool is_synchronized = false; 390 bool has_exception_handler = false; 391 bool is_native = false; 392 if (method != NULL) { 393 is_synchronized = method->is_synchronized(); 394 has_exception_handler = method->has_exception_handler(); 395 is_native = method->is_native(); 396 } 397 // method attributes 398 const char compile_type = is_osr_method ? '%' : ' '; 399 const char sync_char = is_synchronized ? 's' : ' '; 400 const char exception_char = has_exception_handler ? '!' : ' '; 401 const char blocking_char = is_blocking ? 'b' : ' '; 402 const char native_char = is_native ? 'n' : ' '; 403 404 // print method attributes 405 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 406 407 if (TieredCompilation) { 408 if (comp_level != -1) st->print("%d ", comp_level); 409 else st->print("- "); 410 } 411 st->print(" "); // more indent 412 413 if (method == NULL) { 414 st->print("(method)"); 415 } else { 416 method->print_short_name(st); 417 if (is_osr_method) { 418 st->print(" @ %d", osr_bci); 419 } 420 if (method->is_native()) 421 st->print(" (native)"); 422 else 423 st->print(" (%d bytes)", method->code_size()); 424 } 425 426 if (msg != NULL) { 427 st->print(" %s", msg); 428 } 429 if (!short_form) { 430 st->cr(); 431 } 432 } 433 434 // ------------------------------------------------------------------ 435 // CompileTask::print_inlining 436 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 437 // 1234567 438 st->print(" "); // print timestamp 439 // 1234 440 st->print(" "); // print compilation number 441 442 // method attributes 443 if (method->is_loaded()) { 444 const char sync_char = method->is_synchronized() ? 's' : ' '; 445 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 446 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 447 448 // print method attributes 449 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 450 } else { 451 // %s!bn 452 st->print(" "); // print method attributes 453 } 454 455 if (TieredCompilation) { 456 st->print(" "); 457 } 458 st->print(" "); // more indent 459 st->print(" "); // initial inlining indent 460 461 for (int i = 0; i < inline_level; i++) st->print(" "); 462 463 st->print("@ %d ", bci); // print bci 464 method->print_short_name(st); 465 if (method->is_loaded()) 466 st->print(" (%d bytes)", method->code_size()); 467 else 468 st->print(" (not loaded)"); 469 470 if (msg != NULL) { 471 st->print(" %s", msg); 472 } 473 st->cr(); 474 } 475 476 // ------------------------------------------------------------------ 477 // CompileTask::print_inline_indent 478 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 479 // 1234567 480 st->print(" "); // print timestamp 481 // 1234 482 st->print(" "); // print compilation number 483 // %s!bn 484 st->print(" "); // print method attributes 485 if (TieredCompilation) { 486 st->print(" "); 487 } 488 st->print(" "); // more indent 489 st->print(" "); // initial inlining indent 490 for (int i = 0; i < inline_level; i++) st->print(" "); 491 } 492 493 // ------------------------------------------------------------------ 494 // CompileTask::print_compilation 495 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) { 496 bool is_osr_method = osr_bci() != InvocationEntryBci; 497 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form); 498 } 499 500 // ------------------------------------------------------------------ 501 // CompileTask::log_task 502 void CompileTask::log_task(xmlStream* log) { 503 Thread* thread = Thread::current(); 504 methodHandle method(thread, this->method()); 505 ResourceMark rm(thread); 506 507 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 508 log->print(" compile_id='%d'", _compile_id); 509 if (_osr_bci != CompileBroker::standard_entry_bci) { 510 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 511 } // else compile_kind='c2c' 512 if (!method.is_null()) log->method(method); 513 if (_osr_bci != CompileBroker::standard_entry_bci) { 514 log->print(" osr_bci='%d'", _osr_bci); 515 } 516 if (_comp_level != CompLevel_highest_tier) { 517 log->print(" level='%d'", _comp_level); 518 } 519 if (_is_blocking) { 520 log->print(" blocking='1'"); 521 } 522 log->stamp(); 523 } 524 525 526 // ------------------------------------------------------------------ 527 // CompileTask::log_task_queued 528 void CompileTask::log_task_queued() { 529 Thread* thread = Thread::current(); 530 ttyLocker ttyl; 531 ResourceMark rm(thread); 532 533 xtty->begin_elem("task_queued"); 534 log_task(xtty); 535 if (_comment != NULL) { 536 xtty->print(" comment='%s'", _comment); 537 } 538 if (_hot_method != NULL) { 539 methodHandle hot(thread, _hot_method); 540 methodHandle method(thread, _method); 541 if (hot() != method()) { 542 xtty->method(hot); 543 } 544 } 545 if (_hot_count != 0) { 546 xtty->print(" hot_count='%d'", _hot_count); 547 } 548 xtty->end_elem(); 549 } 550 551 552 // ------------------------------------------------------------------ 553 // CompileTask::log_task_start 554 void CompileTask::log_task_start(CompileLog* log) { 555 log->begin_head("task"); 556 log_task(log); 557 log->end_head(); 558 } 559 560 561 // ------------------------------------------------------------------ 562 // CompileTask::log_task_done 563 void CompileTask::log_task_done(CompileLog* log) { 564 Thread* thread = Thread::current(); 565 methodHandle method(thread, this->method()); 566 ResourceMark rm(thread); 567 568 // <task_done ... stamp='1.234'> </task> 569 nmethod* nm = code(); 570 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 571 _is_success, nm == NULL ? 0 : nm->content_size(), 572 method->invocation_count()); 573 int bec = method->backedge_count(); 574 if (bec != 0) log->print(" backedge_count='%d'", bec); 575 // Note: "_is_complete" is about to be set, but is not. 576 if (_num_inlined_bytecodes != 0) { 577 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 578 } 579 log->stamp(); 580 log->end_elem(); 581 log->tail("task"); 582 log->clear_identities(); // next task will have different CI 583 if (log->unflushed_count() > 2000) { 584 log->flush(); 585 } 586 log->mark_file_end(); 587 } 588 589 590 591 // Add a CompileTask to a CompileQueue 592 void CompileQueue::add(CompileTask* task) { 593 assert(lock()->owned_by_self(), "must own lock"); 594 595 task->set_next(NULL); 596 task->set_prev(NULL); 597 598 if (_last == NULL) { 599 // The compile queue is empty. 600 assert(_first == NULL, "queue is empty"); 601 _first = task; 602 _last = task; 603 } else { 604 // Append the task to the queue. 605 assert(_last->next() == NULL, "not last"); 606 _last->set_next(task); 607 task->set_prev(_last); 608 _last = task; 609 } 610 ++_size; 611 612 // Mark the method as being in the compile queue. 613 task->method()->set_queued_for_compilation(); 614 615 if (CIPrintCompileQueue) { 616 print(); 617 } 618 619 if (LogCompilation && xtty != NULL) { 620 task->log_task_queued(); 621 } 622 623 // Notify CompilerThreads that a task is available. 624 lock()->notify_all(); 625 } 626 627 void CompileQueue::delete_all() { 628 assert(lock()->owned_by_self(), "must own lock"); 629 if (_first != NULL) { 630 for (CompileTask* task = _first; task != NULL; task = task->next()) { 631 delete task; 632 } 633 _first = NULL; 634 } 635 } 636 637 // ------------------------------------------------------------------ 638 // CompileQueue::get 639 // 640 // Get the next CompileTask from a CompileQueue 641 CompileTask* CompileQueue::get() { 642 NMethodSweeper::possibly_sweep(); 643 644 MutexLocker locker(lock()); 645 // If _first is NULL we have no more compile jobs. There are two reasons for 646 // having no compile jobs: First, we compiled everything we wanted. Second, 647 // we ran out of code cache so compilation has been disabled. In the latter 648 // case we perform code cache sweeps to free memory such that we can re-enable 649 // compilation. 650 while (_first == NULL) { 651 // Exit loop if compilation is disabled forever 652 if (CompileBroker::is_compilation_disabled_forever()) { 653 return NULL; 654 } 655 656 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 657 // Wait a certain amount of time to possibly do another sweep. 658 // We must wait until stack scanning has happened so that we can 659 // transition a method's state from 'not_entrant' to 'zombie'. 660 long wait_time = NmethodSweepCheckInterval * 1000; 661 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 662 // Only one thread at a time can do sweeping. Scale the 663 // wait time according to the number of compiler threads. 664 // As a result, the next sweep is likely to happen every 100ms 665 // with an arbitrary number of threads that do sweeping. 666 wait_time = 100 * CICompilerCount; 667 } 668 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 669 if (timeout) { 670 MutexUnlocker ul(lock()); 671 NMethodSweeper::possibly_sweep(); 672 } 673 } else { 674 // If there are no compilation tasks and we can compile new jobs 675 // (i.e., there is enough free space in the code cache) there is 676 // no need to invoke the sweeper. As a result, the hotness of methods 677 // remains unchanged. This behavior is desired, since we want to keep 678 // the stable state, i.e., we do not want to evict methods from the 679 // code cache if it is unnecessary. 680 // We need a timed wait here, since compiler threads can exit if compilation 681 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 682 // is not critical and we do not want idle compiler threads to wake up too often. 683 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 684 } 685 } 686 687 if (CompileBroker::is_compilation_disabled_forever()) { 688 return NULL; 689 } 690 691 CompileTask* task = CompilationPolicy::policy()->select_task(this); 692 remove(task); 693 return task; 694 } 695 696 void CompileQueue::remove(CompileTask* task) 697 { 698 assert(lock()->owned_by_self(), "must own lock"); 699 if (task->prev() != NULL) { 700 task->prev()->set_next(task->next()); 701 } else { 702 // max is the first element 703 assert(task == _first, "Sanity"); 704 _first = task->next(); 705 } 706 707 if (task->next() != NULL) { 708 task->next()->set_prev(task->prev()); 709 } else { 710 // max is the last element 711 assert(task == _last, "Sanity"); 712 _last = task->prev(); 713 } 714 --_size; 715 } 716 717 // methods in the compile queue need to be marked as used on the stack 718 // so that they don't get reclaimed by Redefine Classes 719 void CompileQueue::mark_on_stack() { 720 CompileTask* task = _first; 721 while (task != NULL) { 722 task->mark_on_stack(); 723 task = task->next(); 724 } 725 } 726 727 // ------------------------------------------------------------------ 728 // CompileQueue::print 729 void CompileQueue::print() { 730 tty->print_cr("Contents of %s", name()); 731 tty->print_cr("----------------------"); 732 CompileTask* task = _first; 733 while (task != NULL) { 734 task->print_line(); 735 task = task->next(); 736 } 737 tty->print_cr("----------------------"); 738 } 739 740 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 741 742 _current_method[0] = '\0'; 743 _compile_type = CompileBroker::no_compile; 744 745 if (UsePerfData) { 746 ResourceMark rm; 747 748 // create the thread instance name space string - don't create an 749 // instance subspace if instance is -1 - keeps the adapterThread 750 // counters from having a ".0" namespace. 751 const char* thread_i = (instance == -1) ? thread_name : 752 PerfDataManager::name_space(thread_name, instance); 753 754 755 char* name = PerfDataManager::counter_name(thread_i, "method"); 756 _perf_current_method = 757 PerfDataManager::create_string_variable(SUN_CI, name, 758 cmname_buffer_length, 759 _current_method, CHECK); 760 761 name = PerfDataManager::counter_name(thread_i, "type"); 762 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 763 PerfData::U_None, 764 (jlong)_compile_type, 765 CHECK); 766 767 name = PerfDataManager::counter_name(thread_i, "time"); 768 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 769 PerfData::U_Ticks, CHECK); 770 771 name = PerfDataManager::counter_name(thread_i, "compiles"); 772 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 773 PerfData::U_Events, CHECK); 774 } 775 } 776 777 // ------------------------------------------------------------------ 778 // CompileBroker::compilation_init 779 // 780 // Initialize the Compilation object 781 void CompileBroker::compilation_init() { 782 _last_method_compiled[0] = '\0'; 783 784 // No need to initialize compilation system if we do not use it. 785 if (!UseCompiler) { 786 return; 787 } 788 #ifndef SHARK 789 // Set the interface to the current compiler(s). 790 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 791 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 792 #ifdef COMPILER1 793 if (c1_count > 0) { 794 _compilers[0] = new Compiler(); 795 } 796 #endif // COMPILER1 797 798 #ifdef COMPILER2 799 if (c2_count > 0) { 800 _compilers[1] = new C2Compiler(); 801 } 802 #endif // COMPILER2 803 804 #else // SHARK 805 int c1_count = 0; 806 int c2_count = 1; 807 808 _compilers[1] = new SharkCompiler(); 809 #endif // SHARK 810 811 // Initialize the CompileTask free list 812 _task_free_list = NULL; 813 814 // Start the CompilerThreads 815 init_compiler_threads(c1_count, c2_count); 816 // totalTime performance counter is always created as it is required 817 // by the implementation of java.lang.management.CompilationMBean. 818 { 819 EXCEPTION_MARK; 820 _perf_total_compilation = 821 PerfDataManager::create_counter(JAVA_CI, "totalTime", 822 PerfData::U_Ticks, CHECK); 823 } 824 825 826 if (UsePerfData) { 827 828 EXCEPTION_MARK; 829 830 // create the jvmstat performance counters 831 _perf_osr_compilation = 832 PerfDataManager::create_counter(SUN_CI, "osrTime", 833 PerfData::U_Ticks, CHECK); 834 835 _perf_standard_compilation = 836 PerfDataManager::create_counter(SUN_CI, "standardTime", 837 PerfData::U_Ticks, CHECK); 838 839 _perf_total_bailout_count = 840 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 841 PerfData::U_Events, CHECK); 842 843 _perf_total_invalidated_count = 844 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 845 PerfData::U_Events, CHECK); 846 847 _perf_total_compile_count = 848 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 849 PerfData::U_Events, CHECK); 850 _perf_total_osr_compile_count = 851 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 852 PerfData::U_Events, CHECK); 853 854 _perf_total_standard_compile_count = 855 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 856 PerfData::U_Events, CHECK); 857 858 _perf_sum_osr_bytes_compiled = 859 PerfDataManager::create_counter(SUN_CI, "osrBytes", 860 PerfData::U_Bytes, CHECK); 861 862 _perf_sum_standard_bytes_compiled = 863 PerfDataManager::create_counter(SUN_CI, "standardBytes", 864 PerfData::U_Bytes, CHECK); 865 866 _perf_sum_nmethod_size = 867 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 868 PerfData::U_Bytes, CHECK); 869 870 _perf_sum_nmethod_code_size = 871 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 872 PerfData::U_Bytes, CHECK); 873 874 _perf_last_method = 875 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 876 CompilerCounters::cmname_buffer_length, 877 "", CHECK); 878 879 _perf_last_failed_method = 880 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 881 CompilerCounters::cmname_buffer_length, 882 "", CHECK); 883 884 _perf_last_invalidated_method = 885 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 886 CompilerCounters::cmname_buffer_length, 887 "", CHECK); 888 889 _perf_last_compile_type = 890 PerfDataManager::create_variable(SUN_CI, "lastType", 891 PerfData::U_None, 892 (jlong)CompileBroker::no_compile, 893 CHECK); 894 895 _perf_last_compile_size = 896 PerfDataManager::create_variable(SUN_CI, "lastSize", 897 PerfData::U_Bytes, 898 (jlong)CompileBroker::no_compile, 899 CHECK); 900 901 902 _perf_last_failed_type = 903 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 904 PerfData::U_None, 905 (jlong)CompileBroker::no_compile, 906 CHECK); 907 908 _perf_last_invalidated_type = 909 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 910 PerfData::U_None, 911 (jlong)CompileBroker::no_compile, 912 CHECK); 913 } 914 915 _initialized = true; 916 } 917 918 919 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 920 AbstractCompiler* comp, TRAPS) { 921 CompilerThread* compiler_thread = NULL; 922 923 Klass* k = 924 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 925 true, CHECK_0); 926 instanceKlassHandle klass (THREAD, k); 927 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 928 Handle string = java_lang_String::create_from_str(name, CHECK_0); 929 930 // Initialize thread_oop to put it into the system threadGroup 931 Handle thread_group (THREAD, Universe::system_thread_group()); 932 JavaValue result(T_VOID); 933 JavaCalls::call_special(&result, thread_oop, 934 klass, 935 vmSymbols::object_initializer_name(), 936 vmSymbols::threadgroup_string_void_signature(), 937 thread_group, 938 string, 939 CHECK_0); 940 941 { 942 MutexLocker mu(Threads_lock, THREAD); 943 compiler_thread = new CompilerThread(queue, counters); 944 // At this point the new CompilerThread data-races with this startup 945 // thread (which I believe is the primoridal thread and NOT the VM 946 // thread). This means Java bytecodes being executed at startup can 947 // queue compile jobs which will run at whatever default priority the 948 // newly created CompilerThread runs at. 949 950 951 // At this point it may be possible that no osthread was created for the 952 // JavaThread due to lack of memory. We would have to throw an exception 953 // in that case. However, since this must work and we do not allow 954 // exceptions anyway, check and abort if this fails. 955 956 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 957 vm_exit_during_initialization("java.lang.OutOfMemoryError", 958 "unable to create new native thread"); 959 } 960 961 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 962 963 // Note that this only sets the JavaThread _priority field, which by 964 // definition is limited to Java priorities and not OS priorities. 965 // The os-priority is set in the CompilerThread startup code itself 966 967 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 968 969 // Note that we cannot call os::set_priority because it expects Java 970 // priorities and we are *explicitly* using OS priorities so that it's 971 // possible to set the compiler thread priority higher than any Java 972 // thread. 973 974 int native_prio = CompilerThreadPriority; 975 if (native_prio == -1) { 976 if (UseCriticalCompilerThreadPriority) { 977 native_prio = os::java_to_os_priority[CriticalPriority]; 978 } else { 979 native_prio = os::java_to_os_priority[NearMaxPriority]; 980 } 981 } 982 os::set_native_priority(compiler_thread, native_prio); 983 984 java_lang_Thread::set_daemon(thread_oop()); 985 986 compiler_thread->set_threadObj(thread_oop()); 987 compiler_thread->set_compiler(comp); 988 Threads::add(compiler_thread); 989 Thread::start(compiler_thread); 990 } 991 992 // Let go of Threads_lock before yielding 993 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 994 995 return compiler_thread; 996 } 997 998 999 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 1000 EXCEPTION_MARK; 1001 #if !defined(ZERO) && !defined(SHARK) 1002 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1003 #endif // !ZERO && !SHARK 1004 // Initialize the compilation queue 1005 if (c2_compiler_count > 0) { 1006 _c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock); 1007 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1008 } 1009 if (c1_compiler_count > 0) { 1010 _c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock); 1011 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1012 } 1013 1014 int compiler_count = c1_compiler_count + c2_compiler_count; 1015 1016 _compiler_threads = 1017 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1018 1019 char name_buffer[256]; 1020 for (int i = 0; i < c2_compiler_count; i++) { 1021 // Create a name for our thread. 1022 sprintf(name_buffer, "C2 CompilerThread%d", i); 1023 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1024 // Shark and C2 1025 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK); 1026 _compiler_threads->append(new_thread); 1027 } 1028 1029 for (int i = c2_compiler_count; i < compiler_count; i++) { 1030 // Create a name for our thread. 1031 sprintf(name_buffer, "C1 CompilerThread%d", i); 1032 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1033 // C1 1034 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK); 1035 _compiler_threads->append(new_thread); 1036 } 1037 1038 if (UsePerfData) { 1039 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1040 } 1041 } 1042 1043 1044 // Set the methods on the stack as on_stack so that redefine classes doesn't 1045 // reclaim them 1046 void CompileBroker::mark_on_stack() { 1047 if (_c2_method_queue != NULL) { 1048 _c2_method_queue->mark_on_stack(); 1049 } 1050 if (_c1_method_queue != NULL) { 1051 _c1_method_queue->mark_on_stack(); 1052 } 1053 } 1054 1055 // ------------------------------------------------------------------ 1056 // CompileBroker::compile_method 1057 // 1058 // Request compilation of a method. 1059 void CompileBroker::compile_method_base(methodHandle method, 1060 int osr_bci, 1061 int comp_level, 1062 methodHandle hot_method, 1063 int hot_count, 1064 const char* comment, 1065 Thread* thread) { 1066 // do nothing if compiler thread(s) is not available 1067 if (!_initialized ) { 1068 return; 1069 } 1070 1071 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1072 assert(method->method_holder()->oop_is_instance(), 1073 "sanity check"); 1074 assert(!method->method_holder()->is_not_initialized(), 1075 "method holder must be initialized"); 1076 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1077 1078 if (CIPrintRequests) { 1079 tty->print("request: "); 1080 method->print_short_name(tty); 1081 if (osr_bci != InvocationEntryBci) { 1082 tty->print(" osr_bci: %d", osr_bci); 1083 } 1084 tty->print(" comment: %s count: %d", comment, hot_count); 1085 if (!hot_method.is_null()) { 1086 tty->print(" hot: "); 1087 if (hot_method() != method()) { 1088 hot_method->print_short_name(tty); 1089 } else { 1090 tty->print("yes"); 1091 } 1092 } 1093 tty->cr(); 1094 } 1095 1096 // A request has been made for compilation. Before we do any 1097 // real work, check to see if the method has been compiled 1098 // in the meantime with a definitive result. 1099 if (compilation_is_complete(method, osr_bci, comp_level)) { 1100 return; 1101 } 1102 1103 #ifndef PRODUCT 1104 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1105 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1106 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1107 return; 1108 } 1109 } 1110 #endif 1111 1112 // If this method is already in the compile queue, then 1113 // we do not block the current thread. 1114 if (compilation_is_in_queue(method, osr_bci)) { 1115 // We may want to decay our counter a bit here to prevent 1116 // multiple denied requests for compilation. This is an 1117 // open compilation policy issue. Note: The other possibility, 1118 // in the case that this is a blocking compile request, is to have 1119 // all subsequent blocking requesters wait for completion of 1120 // ongoing compiles. Note that in this case we'll need a protocol 1121 // for freeing the associated compile tasks. [Or we could have 1122 // a single static monitor on which all these waiters sleep.] 1123 return; 1124 } 1125 1126 // If the requesting thread is holding the pending list lock 1127 // then we just return. We can't risk blocking while holding 1128 // the pending list lock or a 3-way deadlock may occur 1129 // between the reference handler thread, a GC (instigated 1130 // by a compiler thread), and compiled method registration. 1131 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1132 return; 1133 } 1134 1135 // Outputs from the following MutexLocker block: 1136 CompileTask* task = NULL; 1137 bool blocking = false; 1138 CompileQueue* queue = compile_queue(comp_level); 1139 1140 // Acquire our lock. 1141 { 1142 MutexLocker locker(queue->lock(), thread); 1143 1144 // Make sure the method has not slipped into the queues since 1145 // last we checked; note that those checks were "fast bail-outs". 1146 // Here we need to be more careful, see 14012000 below. 1147 if (compilation_is_in_queue(method, osr_bci)) { 1148 return; 1149 } 1150 1151 // We need to check again to see if the compilation has 1152 // completed. A previous compilation may have registered 1153 // some result. 1154 if (compilation_is_complete(method, osr_bci, comp_level)) { 1155 return; 1156 } 1157 1158 // We now know that this compilation is not pending, complete, 1159 // or prohibited. Assign a compile_id to this compilation 1160 // and check to see if it is in our [Start..Stop) range. 1161 int compile_id = assign_compile_id(method, osr_bci); 1162 if (compile_id == 0) { 1163 // The compilation falls outside the allowed range. 1164 return; 1165 } 1166 1167 // Should this thread wait for completion of the compile? 1168 blocking = is_compile_blocking(method, osr_bci); 1169 1170 // We will enter the compilation in the queue. 1171 // 14012000: Note that this sets the queued_for_compile bits in 1172 // the target method. We can now reason that a method cannot be 1173 // queued for compilation more than once, as follows: 1174 // Before a thread queues a task for compilation, it first acquires 1175 // the compile queue lock, then checks if the method's queued bits 1176 // are set or it has already been compiled. Thus there can not be two 1177 // instances of a compilation task for the same method on the 1178 // compilation queue. Consider now the case where the compilation 1179 // thread has already removed a task for that method from the queue 1180 // and is in the midst of compiling it. In this case, the 1181 // queued_for_compile bits must be set in the method (and these 1182 // will be visible to the current thread, since the bits were set 1183 // under protection of the compile queue lock, which we hold now. 1184 // When the compilation completes, the compiler thread first sets 1185 // the compilation result and then clears the queued_for_compile 1186 // bits. Neither of these actions are protected by a barrier (or done 1187 // under the protection of a lock), so the only guarantee we have 1188 // (on machines with TSO (Total Store Order)) is that these values 1189 // will update in that order. As a result, the only combinations of 1190 // these bits that the current thread will see are, in temporal order: 1191 // <RESULT, QUEUE> : 1192 // <0, 1> : in compile queue, but not yet compiled 1193 // <1, 1> : compiled but queue bit not cleared 1194 // <1, 0> : compiled and queue bit cleared 1195 // Because we first check the queue bits then check the result bits, 1196 // we are assured that we cannot introduce a duplicate task. 1197 // Note that if we did the tests in the reverse order (i.e. check 1198 // result then check queued bit), we could get the result bit before 1199 // the compilation completed, and the queue bit after the compilation 1200 // completed, and end up introducing a "duplicate" (redundant) task. 1201 // In that case, the compiler thread should first check if a method 1202 // has already been compiled before trying to compile it. 1203 // NOTE: in the event that there are multiple compiler threads and 1204 // there is de-optimization/recompilation, things will get hairy, 1205 // and in that case it's best to protect both the testing (here) of 1206 // these bits, and their updating (here and elsewhere) under a 1207 // common lock. 1208 task = create_compile_task(queue, 1209 compile_id, method, 1210 osr_bci, comp_level, 1211 hot_method, hot_count, comment, 1212 blocking); 1213 } 1214 1215 if (blocking) { 1216 wait_for_completion(task); 1217 } 1218 } 1219 1220 1221 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1222 int comp_level, 1223 methodHandle hot_method, int hot_count, 1224 const char* comment, Thread* THREAD) { 1225 // make sure arguments make sense 1226 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1227 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1228 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1229 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1230 // allow any levels for WhiteBox 1231 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1232 // return quickly if possible 1233 1234 // lock, make sure that the compilation 1235 // isn't prohibited in a straightforward way. 1236 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1237 if (comp == NULL || !comp->can_compile_method(method) || 1238 compilation_is_prohibited(method, osr_bci, comp_level)) { 1239 return NULL; 1240 } 1241 1242 if (osr_bci == InvocationEntryBci) { 1243 // standard compilation 1244 nmethod* method_code = method->code(); 1245 if (method_code != NULL) { 1246 if (compilation_is_complete(method, osr_bci, comp_level)) { 1247 return method_code; 1248 } 1249 } 1250 if (method->is_not_compilable(comp_level)) { 1251 return NULL; 1252 } 1253 } else { 1254 // osr compilation 1255 #ifndef TIERED 1256 // seems like an assert of dubious value 1257 assert(comp_level == CompLevel_highest_tier, 1258 "all OSR compiles are assumed to be at a single compilation lavel"); 1259 #endif // TIERED 1260 // We accept a higher level osr method 1261 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1262 if (nm != NULL) return nm; 1263 if (method->is_not_osr_compilable(comp_level)) return NULL; 1264 } 1265 1266 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1267 // some prerequisites that are compiler specific 1268 if (comp->is_c2() || comp->is_shark()) { 1269 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1270 // Resolve all classes seen in the signature of the method 1271 // we are compiling. 1272 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1273 } 1274 1275 // If the method is native, do the lookup in the thread requesting 1276 // the compilation. Native lookups can load code, which is not 1277 // permitted during compilation. 1278 // 1279 // Note: A native method implies non-osr compilation which is 1280 // checked with an assertion at the entry of this method. 1281 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1282 bool in_base_library; 1283 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1284 if (HAS_PENDING_EXCEPTION) { 1285 // In case of an exception looking up the method, we just forget 1286 // about it. The interpreter will kick-in and throw the exception. 1287 method->set_not_compilable(); // implies is_not_osr_compilable() 1288 CLEAR_PENDING_EXCEPTION; 1289 return NULL; 1290 } 1291 assert(method->has_native_function(), "must have native code by now"); 1292 } 1293 1294 // RedefineClasses() has replaced this method; just return 1295 if (method->is_old()) { 1296 return NULL; 1297 } 1298 1299 // JVMTI -- post_compile_event requires jmethod_id() that may require 1300 // a lock the compiling thread can not acquire. Prefetch it here. 1301 if (JvmtiExport::should_post_compiled_method_load()) { 1302 method->jmethod_id(); 1303 } 1304 1305 // do the compilation 1306 if (method->is_native()) { 1307 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1308 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1309 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1310 // 1311 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1312 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1313 AdapterHandlerLibrary::create_native_wrapper(method); 1314 } else { 1315 return NULL; 1316 } 1317 } else { 1318 // If the compiler is shut off due to code cache getting full 1319 // fail out now so blocking compiles dont hang the java thread 1320 if (!should_compile_new_jobs()) { 1321 CompilationPolicy::policy()->delay_compilation(method()); 1322 return NULL; 1323 } 1324 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1325 } 1326 1327 // return requested nmethod 1328 // We accept a higher level osr method 1329 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1330 } 1331 1332 1333 // ------------------------------------------------------------------ 1334 // CompileBroker::compilation_is_complete 1335 // 1336 // See if compilation of this method is already complete. 1337 bool CompileBroker::compilation_is_complete(methodHandle method, 1338 int osr_bci, 1339 int comp_level) { 1340 bool is_osr = (osr_bci != standard_entry_bci); 1341 if (is_osr) { 1342 if (method->is_not_osr_compilable(comp_level)) { 1343 return true; 1344 } else { 1345 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1346 return (result != NULL); 1347 } 1348 } else { 1349 if (method->is_not_compilable(comp_level)) { 1350 return true; 1351 } else { 1352 nmethod* result = method->code(); 1353 if (result == NULL) return false; 1354 return comp_level == result->comp_level(); 1355 } 1356 } 1357 } 1358 1359 1360 // ------------------------------------------------------------------ 1361 // CompileBroker::compilation_is_in_queue 1362 // 1363 // See if this compilation is already requested. 1364 // 1365 // Implementation note: there is only a single "is in queue" bit 1366 // for each method. This means that the check below is overly 1367 // conservative in the sense that an osr compilation in the queue 1368 // will block a normal compilation from entering the queue (and vice 1369 // versa). This can be remedied by a full queue search to disambiguate 1370 // cases. If it is deemed profitible, this may be done. 1371 bool CompileBroker::compilation_is_in_queue(methodHandle method, 1372 int osr_bci) { 1373 return method->queued_for_compilation(); 1374 } 1375 1376 // ------------------------------------------------------------------ 1377 // CompileBroker::compilation_is_prohibited 1378 // 1379 // See if this compilation is not allowed. 1380 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1381 bool is_native = method->is_native(); 1382 // Some compilers may not support the compilation of natives. 1383 AbstractCompiler *comp = compiler(comp_level); 1384 if (is_native && 1385 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1386 method->set_not_compilable_quietly(comp_level); 1387 return true; 1388 } 1389 1390 bool is_osr = (osr_bci != standard_entry_bci); 1391 // Some compilers may not support on stack replacement. 1392 if (is_osr && 1393 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1394 method->set_not_osr_compilable(comp_level); 1395 return true; 1396 } 1397 1398 // The method may be explicitly excluded by the user. 1399 bool quietly; 1400 if (CompilerOracle::should_exclude(method, quietly)) { 1401 if (!quietly) { 1402 // This does not happen quietly... 1403 ResourceMark rm; 1404 tty->print("### Excluding %s:%s", 1405 method->is_native() ? "generation of native wrapper" : "compile", 1406 (method->is_static() ? " static" : "")); 1407 method->print_short_name(tty); 1408 tty->cr(); 1409 } 1410 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1411 } 1412 1413 return false; 1414 } 1415 1416 /** 1417 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1418 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1419 * The function also allows to generate separate compilation IDs for OSR compilations. 1420 */ 1421 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1422 #ifdef ASSERT 1423 bool is_osr = (osr_bci != standard_entry_bci); 1424 int id; 1425 if (method->is_native()) { 1426 assert(!is_osr, "can't be osr"); 1427 // Adapters, native wrappers and method handle intrinsics 1428 // should be generated always. 1429 return Atomic::add(1, &_compilation_id); 1430 } else if (CICountOSR && is_osr) { 1431 id = Atomic::add(1, &_osr_compilation_id); 1432 if (CIStartOSR <= id && id < CIStopOSR) { 1433 return id; 1434 } 1435 } else { 1436 id = Atomic::add(1, &_compilation_id); 1437 if (CIStart <= id && id < CIStop) { 1438 return id; 1439 } 1440 } 1441 1442 // Method was not in the appropriate compilation range. 1443 method->set_not_compilable_quietly(); 1444 return 0; 1445 #else 1446 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1447 // only _compilation_id is incremented. 1448 return Atomic::add(1, &_compilation_id); 1449 #endif 1450 } 1451 1452 1453 // ------------------------------------------------------------------ 1454 // CompileBroker::is_compile_blocking 1455 // 1456 // Should the current thread be blocked until this compilation request 1457 // has been fulfilled? 1458 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) { 1459 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1460 return !BackgroundCompilation; 1461 } 1462 1463 1464 // ------------------------------------------------------------------ 1465 // CompileBroker::preload_classes 1466 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1467 // Move this code over from c1_Compiler.cpp 1468 ShouldNotReachHere(); 1469 } 1470 1471 1472 // ------------------------------------------------------------------ 1473 // CompileBroker::create_compile_task 1474 // 1475 // Create a CompileTask object representing the current request for 1476 // compilation. Add this task to the queue. 1477 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1478 int compile_id, 1479 methodHandle method, 1480 int osr_bci, 1481 int comp_level, 1482 methodHandle hot_method, 1483 int hot_count, 1484 const char* comment, 1485 bool blocking) { 1486 CompileTask* new_task = allocate_task(); 1487 new_task->initialize(compile_id, method, osr_bci, comp_level, 1488 hot_method, hot_count, comment, 1489 blocking); 1490 queue->add(new_task); 1491 return new_task; 1492 } 1493 1494 1495 // ------------------------------------------------------------------ 1496 // CompileBroker::allocate_task 1497 // 1498 // Allocate a CompileTask, from the free list if possible. 1499 CompileTask* CompileBroker::allocate_task() { 1500 MutexLocker locker(CompileTaskAlloc_lock); 1501 CompileTask* task = NULL; 1502 if (_task_free_list != NULL) { 1503 task = _task_free_list; 1504 _task_free_list = task->next(); 1505 task->set_next(NULL); 1506 } else { 1507 task = new CompileTask(); 1508 task->set_next(NULL); 1509 } 1510 return task; 1511 } 1512 1513 1514 // ------------------------------------------------------------------ 1515 // CompileBroker::free_task 1516 // 1517 // Add a task to the free list. 1518 void CompileBroker::free_task(CompileTask* task) { 1519 MutexLocker locker(CompileTaskAlloc_lock); 1520 task->free(); 1521 task->set_next(_task_free_list); 1522 _task_free_list = task; 1523 } 1524 1525 1526 // ------------------------------------------------------------------ 1527 // CompileBroker::wait_for_completion 1528 // 1529 // Wait for the given method CompileTask to complete. 1530 void CompileBroker::wait_for_completion(CompileTask* task) { 1531 if (CIPrintCompileQueue) { 1532 tty->print_cr("BLOCKING FOR COMPILE"); 1533 } 1534 1535 assert(task->is_blocking(), "can only wait on blocking task"); 1536 1537 JavaThread *thread = JavaThread::current(); 1538 thread->set_blocked_on_compilation(true); 1539 1540 methodHandle method(thread, task->method()); 1541 { 1542 MutexLocker waiter(task->lock(), thread); 1543 1544 while (!task->is_complete()) 1545 task->lock()->wait(); 1546 } 1547 // It is harmless to check this status without the lock, because 1548 // completion is a stable property (until the task object is recycled). 1549 assert(task->is_complete(), "Compilation should have completed"); 1550 assert(task->code_handle() == NULL, "must be reset"); 1551 1552 thread->set_blocked_on_compilation(false); 1553 1554 // By convention, the waiter is responsible for recycling a 1555 // blocking CompileTask. Since there is only one waiter ever 1556 // waiting on a CompileTask, we know that no one else will 1557 // be using this CompileTask; we can free it. 1558 free_task(task); 1559 } 1560 1561 // Initialize compiler thread(s) + compiler object(s). The postcondition 1562 // of this function is that the compiler runtimes are initialized and that 1563 //compiler threads can start compiling. 1564 bool CompileBroker::init_compiler_runtime() { 1565 CompilerThread* thread = CompilerThread::current(); 1566 AbstractCompiler* comp = thread->compiler(); 1567 // Final sanity check - the compiler object must exist 1568 guarantee(comp != NULL, "Compiler object must exist"); 1569 1570 int system_dictionary_modification_counter; 1571 { 1572 MutexLocker locker(Compile_lock, thread); 1573 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1574 } 1575 1576 { 1577 // Must switch to native to allocate ci_env 1578 ThreadToNativeFromVM ttn(thread); 1579 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1580 // Cache Jvmti state 1581 ci_env.cache_jvmti_state(); 1582 // Cache DTrace flags 1583 ci_env.cache_dtrace_flags(); 1584 1585 // Switch back to VM state to do compiler initialization 1586 ThreadInVMfromNative tv(thread); 1587 ResetNoHandleMark rnhm; 1588 1589 1590 if (!comp->is_shark()) { 1591 // Perform per-thread and global initializations 1592 comp->initialize(); 1593 } 1594 } 1595 1596 if (comp->is_failed()) { 1597 disable_compilation_forever(); 1598 // If compiler initialization failed, no compiler thread that is specific to a 1599 // particular compiler runtime will ever start to compile methods. 1600 1601 shutdown_compiler_runtime(comp, thread); 1602 return false; 1603 } 1604 1605 // C1 specific check 1606 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1607 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1608 return false; 1609 } 1610 1611 return true; 1612 } 1613 1614 // If C1 and/or C2 initialization failed, we shut down all compilation. 1615 // We do this to keep things simple. This can be changed if it ever turns out to be 1616 // a problem. 1617 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1618 // Free buffer blob, if allocated 1619 if (thread->get_buffer_blob() != NULL) { 1620 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1621 CodeCache::free(thread->get_buffer_blob()); 1622 } 1623 1624 if (comp->should_perform_shutdown()) { 1625 // There are two reasons for shutting down the compiler 1626 // 1) compiler runtime initialization failed 1627 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1628 warning("Shutting down compiler %s (no space to run compilers)", comp->name()); 1629 1630 // Only one thread per compiler runtime object enters here 1631 // Set state to shut down 1632 comp->set_shut_down(); 1633 1634 MutexLocker mu(MethodCompileQueue_lock, thread); 1635 CompileQueue* queue; 1636 if (_c1_method_queue != NULL) { 1637 _c1_method_queue->delete_all(); 1638 queue = _c1_method_queue; 1639 _c1_method_queue = NULL; 1640 delete _c1_method_queue; 1641 } 1642 1643 if (_c2_method_queue != NULL) { 1644 _c2_method_queue->delete_all(); 1645 queue = _c2_method_queue; 1646 _c2_method_queue = NULL; 1647 delete _c2_method_queue; 1648 } 1649 1650 // We could delete compiler runtimes also. However, there are references to 1651 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1652 // fail. This can be done later if necessary. 1653 } 1654 } 1655 1656 // ------------------------------------------------------------------ 1657 // CompileBroker::compiler_thread_loop 1658 // 1659 // The main loop run by a CompilerThread. 1660 void CompileBroker::compiler_thread_loop() { 1661 CompilerThread* thread = CompilerThread::current(); 1662 CompileQueue* queue = thread->queue(); 1663 // For the thread that initializes the ciObjectFactory 1664 // this resource mark holds all the shared objects 1665 ResourceMark rm; 1666 1667 // First thread to get here will initialize the compiler interface 1668 1669 if (!ciObjectFactory::is_initialized()) { 1670 ASSERT_IN_VM; 1671 MutexLocker only_one (CompileThread_lock, thread); 1672 if (!ciObjectFactory::is_initialized()) { 1673 ciObjectFactory::initialize(); 1674 } 1675 } 1676 1677 // Open a log. 1678 if (LogCompilation) { 1679 init_compiler_thread_log(); 1680 } 1681 CompileLog* log = thread->log(); 1682 if (log != NULL) { 1683 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1684 thread->name(), 1685 os::current_thread_id(), 1686 os::current_process_id()); 1687 log->stamp(); 1688 log->end_elem(); 1689 } 1690 1691 // If compiler thread/runtime initialization fails, exit the compiler thread 1692 if (!init_compiler_runtime()) { 1693 return; 1694 } 1695 1696 // Poll for new compilation tasks as long as the JVM runs. Compilation 1697 // should only be disabled if something went wrong while initializing the 1698 // compiler runtimes. This, in turn, should not happen. The only known case 1699 // when compiler runtime initialization fails is if there is not enough free 1700 // space in the code cache to generate the necessary stubs, etc. 1701 while (!is_compilation_disabled_forever()) { 1702 // We need this HandleMark to avoid leaking VM handles. 1703 HandleMark hm(thread); 1704 1705 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1706 // the code cache is really full 1707 handle_full_code_cache(); 1708 } 1709 1710 CompileTask* task = queue->get(); 1711 if (task == NULL) { 1712 continue; 1713 } 1714 1715 // Give compiler threads an extra quanta. They tend to be bursty and 1716 // this helps the compiler to finish up the job. 1717 if( CompilerThreadHintNoPreempt ) 1718 os::hint_no_preempt(); 1719 1720 // trace per thread time and compile statistics 1721 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1722 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1723 1724 // Assign the task to the current thread. Mark this compilation 1725 // thread as active for the profiler. 1726 CompileTaskWrapper ctw(task); 1727 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1728 task->set_code_handle(&result_handle); 1729 methodHandle method(thread, task->method()); 1730 1731 // Never compile a method if breakpoints are present in it 1732 if (method()->number_of_breakpoints() == 0) { 1733 // Compile the method. 1734 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1735 #ifdef COMPILER1 1736 // Allow repeating compilations for the purpose of benchmarking 1737 // compile speed. This is not useful for customers. 1738 if (CompilationRepeat != 0) { 1739 int compile_count = CompilationRepeat; 1740 while (compile_count > 0) { 1741 invoke_compiler_on_method(task); 1742 nmethod* nm = method->code(); 1743 if (nm != NULL) { 1744 nm->make_zombie(); 1745 method->clear_code(); 1746 } 1747 compile_count--; 1748 } 1749 } 1750 #endif /* COMPILER1 */ 1751 invoke_compiler_on_method(task); 1752 } else { 1753 // After compilation is disabled, remove remaining methods from queue 1754 method->clear_queued_for_compilation(); 1755 } 1756 } 1757 } 1758 1759 // Shut down compiler runtime 1760 shutdown_compiler_runtime(thread->compiler(), thread); 1761 } 1762 1763 // ------------------------------------------------------------------ 1764 // CompileBroker::init_compiler_thread_log 1765 // 1766 // Set up state required by +LogCompilation. 1767 void CompileBroker::init_compiler_thread_log() { 1768 CompilerThread* thread = CompilerThread::current(); 1769 char file_name[4*K]; 1770 FILE* fp = NULL; 1771 intx thread_id = os::current_thread_id(); 1772 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1773 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1774 if (dir == NULL) { 1775 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1776 thread_id, os::current_process_id()); 1777 } else { 1778 jio_snprintf(file_name, sizeof(file_name), 1779 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1780 os::file_separator(), thread_id, os::current_process_id()); 1781 } 1782 1783 fp = fopen(file_name, "at"); 1784 if (fp != NULL) { 1785 if (LogCompilation && Verbose) { 1786 tty->print_cr("Opening compilation log %s", file_name); 1787 } 1788 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1789 thread->init_log(log); 1790 1791 if (xtty != NULL) { 1792 ttyLocker ttyl; 1793 // Record any per thread log files 1794 xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name); 1795 } 1796 return; 1797 } 1798 } 1799 warning("Cannot open log file: %s", file_name); 1800 } 1801 1802 // ------------------------------------------------------------------ 1803 // CompileBroker::set_should_block 1804 // 1805 // Set _should_block. 1806 // Call this from the VM, with Threads_lock held and a safepoint requested. 1807 void CompileBroker::set_should_block() { 1808 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1809 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1810 #ifndef PRODUCT 1811 if (PrintCompilation && (Verbose || WizardMode)) 1812 tty->print_cr("notifying compiler thread pool to block"); 1813 #endif 1814 _should_block = true; 1815 } 1816 1817 // ------------------------------------------------------------------ 1818 // CompileBroker::maybe_block 1819 // 1820 // Call this from the compiler at convenient points, to poll for _should_block. 1821 void CompileBroker::maybe_block() { 1822 if (_should_block) { 1823 #ifndef PRODUCT 1824 if (PrintCompilation && (Verbose || WizardMode)) 1825 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current()); 1826 #endif 1827 ThreadInVMfromNative tivfn(JavaThread::current()); 1828 } 1829 } 1830 1831 // wrapper for CodeCache::print_summary() 1832 static void codecache_print(bool detailed) 1833 { 1834 ResourceMark rm; 1835 stringStream s; 1836 // Dump code cache into a buffer before locking the tty, 1837 { 1838 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1839 CodeCache::print_summary(&s, detailed); 1840 } 1841 ttyLocker ttyl; 1842 tty->print(s.as_string()); 1843 } 1844 1845 // ------------------------------------------------------------------ 1846 // CompileBroker::invoke_compiler_on_method 1847 // 1848 // Compile a method. 1849 // 1850 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1851 if (PrintCompilation) { 1852 ResourceMark rm; 1853 task->print_line(); 1854 } 1855 elapsedTimer time; 1856 1857 CompilerThread* thread = CompilerThread::current(); 1858 ResourceMark rm(thread); 1859 1860 if (LogEvents) { 1861 _compilation_log->log_compile(thread, task); 1862 } 1863 1864 // Common flags. 1865 uint compile_id = task->compile_id(); 1866 int osr_bci = task->osr_bci(); 1867 bool is_osr = (osr_bci != standard_entry_bci); 1868 bool should_log = (thread->log() != NULL); 1869 bool should_break = false; 1870 int task_level = task->comp_level(); 1871 { 1872 // create the handle inside it's own block so it can't 1873 // accidentally be referenced once the thread transitions to 1874 // native. The NoHandleMark before the transition should catch 1875 // any cases where this occurs in the future. 1876 methodHandle method(thread, task->method()); 1877 should_break = check_break_at(method, compile_id, is_osr); 1878 if (should_log && !CompilerOracle::should_log(method)) { 1879 should_log = false; 1880 } 1881 assert(!method->is_native(), "no longer compile natives"); 1882 1883 // Save information about this method in case of failure. 1884 set_last_compile(thread, method, is_osr, task_level); 1885 1886 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1887 } 1888 1889 // Allocate a new set of JNI handles. 1890 push_jni_handle_block(); 1891 Method* target_handle = task->method(); 1892 int compilable = ciEnv::MethodCompilable; 1893 { 1894 int system_dictionary_modification_counter; 1895 { 1896 MutexLocker locker(Compile_lock, thread); 1897 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1898 } 1899 1900 NoHandleMark nhm; 1901 ThreadToNativeFromVM ttn(thread); 1902 1903 ciEnv ci_env(task, system_dictionary_modification_counter); 1904 if (should_break) { 1905 ci_env.set_break_at_compile(true); 1906 } 1907 if (should_log) { 1908 ci_env.set_log(thread->log()); 1909 } 1910 assert(thread->env() == &ci_env, "set by ci_env"); 1911 // The thread-env() field is cleared in ~CompileTaskWrapper. 1912 1913 // Cache Jvmti state 1914 ci_env.cache_jvmti_state(); 1915 1916 // Cache DTrace flags 1917 ci_env.cache_dtrace_flags(); 1918 1919 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1920 1921 TraceTime t1("compilation", &time); 1922 EventCompilation event; 1923 1924 AbstractCompiler *comp = compiler(task_level); 1925 if (comp == NULL) { 1926 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1927 } else { 1928 comp->compile_method(&ci_env, target, osr_bci); 1929 } 1930 1931 if (!ci_env.failing() && task->code() == NULL) { 1932 //assert(false, "compiler should always document failure"); 1933 // The compiler elected, without comment, not to register a result. 1934 // Do not attempt further compilations of this method. 1935 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 1936 } 1937 1938 // Copy this bit to the enclosing block: 1939 compilable = ci_env.compilable(); 1940 1941 if (ci_env.failing()) { 1942 const char* retry_message = ci_env.retry_message(); 1943 if (_compilation_log != NULL) { 1944 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 1945 } 1946 if (PrintCompilation) { 1947 FormatBufferResource msg = retry_message != NULL ? 1948 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 1949 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 1950 task->print_compilation(tty, msg); 1951 } 1952 } else { 1953 task->mark_success(); 1954 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 1955 if (_compilation_log != NULL) { 1956 nmethod* code = task->code(); 1957 if (code != NULL) { 1958 _compilation_log->log_nmethod(thread, code); 1959 } 1960 } 1961 } 1962 // simulate crash during compilation 1963 assert(task->compile_id() != CICrashAt, "just as planned"); 1964 if (event.should_commit()) { 1965 event.set_method(target->get_Method()); 1966 event.set_compileID(compile_id); 1967 event.set_compileLevel(task->comp_level()); 1968 event.set_succeded(task->is_success()); 1969 event.set_isOsr(is_osr); 1970 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 1971 event.set_inlinedBytes(task->num_inlined_bytecodes()); 1972 event.commit(); 1973 } 1974 } 1975 pop_jni_handle_block(); 1976 1977 methodHandle method(thread, task->method()); 1978 1979 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 1980 1981 collect_statistics(thread, time, task); 1982 1983 if (PrintCompilation && PrintCompilation2) { 1984 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 1985 tty->print("%4d ", compile_id); // print compilation number 1986 tty->print("%s ", (is_osr ? "%" : " ")); 1987 if (task->code() != NULL) { 1988 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 1989 } 1990 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 1991 } 1992 1993 if (PrintCodeCacheOnCompilation) 1994 codecache_print(/* detailed= */ false); 1995 1996 // Disable compilation, if required. 1997 switch (compilable) { 1998 case ciEnv::MethodCompilable_never: 1999 if (is_osr) 2000 method->set_not_osr_compilable_quietly(); 2001 else 2002 method->set_not_compilable_quietly(); 2003 break; 2004 case ciEnv::MethodCompilable_not_at_tier: 2005 if (is_osr) 2006 method->set_not_osr_compilable_quietly(task_level); 2007 else 2008 method->set_not_compilable_quietly(task_level); 2009 break; 2010 } 2011 2012 // Note that the queued_for_compilation bits are cleared without 2013 // protection of a mutex. [They were set by the requester thread, 2014 // when adding the task to the complie queue -- at which time the 2015 // compile queue lock was held. Subsequently, we acquired the compile 2016 // queue lock to get this task off the compile queue; thus (to belabour 2017 // the point somewhat) our clearing of the bits must be occurring 2018 // only after the setting of the bits. See also 14012000 above. 2019 method->clear_queued_for_compilation(); 2020 2021 #ifdef ASSERT 2022 if (CollectedHeap::fired_fake_oom()) { 2023 // The current compile received a fake OOM during compilation so 2024 // go ahead and exit the VM since the test apparently succeeded 2025 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2026 vm_exit(0); 2027 } 2028 #endif 2029 } 2030 2031 /** 2032 * The CodeCache is full. Print out warning and disable compilation 2033 * or try code cache cleaning so compilation can continue later. 2034 */ 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 2052 CodeCache::report_codemem_full(); 2053 2054 #ifndef PRODUCT 2055 if (CompileTheWorld || ExitOnFullCodeCache) { 2056 codecache_print(/* detailed= */ true); 2057 before_exit(JavaThread::current()); 2058 exit_globals(); // will delete tty 2059 vm_direct_exit(CompileTheWorld ? 0 : 1); 2060 } 2061 #endif 2062 if (UseCodeCacheFlushing) { 2063 // Since code cache is full, immediately stop new compiles 2064 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2065 NMethodSweeper::log_sweep("disable_compiler"); 2066 } 2067 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2068 // without having to consider the state in which the current thread is. 2069 ThreadInVMfromUnknown in_vm; 2070 NMethodSweeper::possibly_sweep(); 2071 } else { 2072 disable_compilation_forever(); 2073 } 2074 2075 // Print warning only once 2076 if (should_print_compiler_warning()) { 2077 warning("CodeCache is full. Compiler has been disabled."); 2078 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2079 codecache_print(/* detailed= */ true); 2080 } 2081 } 2082 } 2083 2084 // ------------------------------------------------------------------ 2085 // CompileBroker::set_last_compile 2086 // 2087 // Record this compilation for debugging purposes. 2088 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2089 ResourceMark rm; 2090 char* method_name = method->name()->as_C_string(); 2091 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2092 char current_method[CompilerCounters::cmname_buffer_length]; 2093 size_t maxLen = CompilerCounters::cmname_buffer_length; 2094 2095 if (UsePerfData) { 2096 const char* class_name = method->method_holder()->name()->as_C_string(); 2097 2098 size_t s1len = strlen(class_name); 2099 size_t s2len = strlen(method_name); 2100 2101 // check if we need to truncate the string 2102 if (s1len + s2len + 2 > maxLen) { 2103 2104 // the strategy is to lop off the leading characters of the 2105 // class name and the trailing characters of the method name. 2106 2107 if (s2len + 2 > maxLen) { 2108 // lop of the entire class name string, let snprintf handle 2109 // truncation of the method name. 2110 class_name += s1len; // null string 2111 } 2112 else { 2113 // lop off the extra characters from the front of the class name 2114 class_name += ((s1len + s2len + 2) - maxLen); 2115 } 2116 } 2117 2118 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2119 } 2120 2121 if (CICountOSR && is_osr) { 2122 _last_compile_type = osr_compile; 2123 } else { 2124 _last_compile_type = normal_compile; 2125 } 2126 _last_compile_level = comp_level; 2127 2128 if (UsePerfData) { 2129 CompilerCounters* counters = thread->counters(); 2130 counters->set_current_method(current_method); 2131 counters->set_compile_type((jlong)_last_compile_type); 2132 } 2133 } 2134 2135 2136 // ------------------------------------------------------------------ 2137 // CompileBroker::push_jni_handle_block 2138 // 2139 // Push on a new block of JNI handles. 2140 void CompileBroker::push_jni_handle_block() { 2141 JavaThread* thread = JavaThread::current(); 2142 2143 // Allocate a new block for JNI handles. 2144 // Inlined code from jni_PushLocalFrame() 2145 JNIHandleBlock* java_handles = thread->active_handles(); 2146 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2147 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2148 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2149 thread->set_active_handles(compile_handles); 2150 } 2151 2152 2153 // ------------------------------------------------------------------ 2154 // CompileBroker::pop_jni_handle_block 2155 // 2156 // Pop off the current block of JNI handles. 2157 void CompileBroker::pop_jni_handle_block() { 2158 JavaThread* thread = JavaThread::current(); 2159 2160 // Release our JNI handle block 2161 JNIHandleBlock* compile_handles = thread->active_handles(); 2162 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2163 thread->set_active_handles(java_handles); 2164 compile_handles->set_pop_frame_link(NULL); 2165 JNIHandleBlock::release_block(compile_handles, thread); // may block 2166 } 2167 2168 2169 // ------------------------------------------------------------------ 2170 // CompileBroker::check_break_at 2171 // 2172 // Should the compilation break at the current compilation. 2173 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2174 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2175 return true; 2176 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2177 return true; 2178 } else { 2179 return (compile_id == CIBreakAt); 2180 } 2181 } 2182 2183 // ------------------------------------------------------------------ 2184 // CompileBroker::collect_statistics 2185 // 2186 // Collect statistics about the compilation. 2187 2188 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2189 bool success = task->is_success(); 2190 methodHandle method (thread, task->method()); 2191 uint compile_id = task->compile_id(); 2192 bool is_osr = (task->osr_bci() != standard_entry_bci); 2193 nmethod* code = task->code(); 2194 CompilerCounters* counters = thread->counters(); 2195 2196 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2197 MutexLocker locker(CompileStatistics_lock); 2198 2199 // _perf variables are production performance counters which are 2200 // updated regardless of the setting of the CITime and CITimeEach flags 2201 // 2202 if (!success) { 2203 _total_bailout_count++; 2204 if (UsePerfData) { 2205 _perf_last_failed_method->set_value(counters->current_method()); 2206 _perf_last_failed_type->set_value(counters->compile_type()); 2207 _perf_total_bailout_count->inc(); 2208 } 2209 } else if (code == NULL) { 2210 if (UsePerfData) { 2211 _perf_last_invalidated_method->set_value(counters->current_method()); 2212 _perf_last_invalidated_type->set_value(counters->compile_type()); 2213 _perf_total_invalidated_count->inc(); 2214 } 2215 _total_invalidated_count++; 2216 } else { 2217 // Compilation succeeded 2218 2219 // update compilation ticks - used by the implementation of 2220 // java.lang.management.CompilationMBean 2221 _perf_total_compilation->inc(time.ticks()); 2222 2223 _t_total_compilation.add(time); 2224 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2225 2226 if (CITime) { 2227 if (is_osr) { 2228 _t_osr_compilation.add(time); 2229 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2230 } else { 2231 _t_standard_compilation.add(time); 2232 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2233 } 2234 } 2235 2236 if (UsePerfData) { 2237 // save the name of the last method compiled 2238 _perf_last_method->set_value(counters->current_method()); 2239 _perf_last_compile_type->set_value(counters->compile_type()); 2240 _perf_last_compile_size->set_value(method->code_size() + 2241 task->num_inlined_bytecodes()); 2242 if (is_osr) { 2243 _perf_osr_compilation->inc(time.ticks()); 2244 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2245 } else { 2246 _perf_standard_compilation->inc(time.ticks()); 2247 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2248 } 2249 } 2250 2251 if (CITimeEach) { 2252 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2253 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2254 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2255 } 2256 2257 // Collect counts of successful compilations 2258 _sum_nmethod_size += code->total_size(); 2259 _sum_nmethod_code_size += code->insts_size(); 2260 _total_compile_count++; 2261 2262 if (UsePerfData) { 2263 _perf_sum_nmethod_size->inc( code->total_size()); 2264 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2265 _perf_total_compile_count->inc(); 2266 } 2267 2268 if (is_osr) { 2269 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2270 _total_osr_compile_count++; 2271 } else { 2272 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2273 _total_standard_compile_count++; 2274 } 2275 } 2276 // set the current method for the thread to null 2277 if (UsePerfData) counters->set_current_method(""); 2278 } 2279 2280 const char* CompileBroker::compiler_name(int comp_level) { 2281 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2282 if (comp == NULL) { 2283 return "no compiler"; 2284 } else { 2285 return (comp->name()); 2286 } 2287 } 2288 2289 void CompileBroker::print_times() { 2290 tty->cr(); 2291 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2292 tty->print_cr("------------------------------------------------"); 2293 //0000000000111111111122222222223333333333444444444455555555556666666666 2294 //0123456789012345678901234567890123456789012345678901234567890123456789 2295 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2296 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2297 CompileBroker::_t_standard_compilation.seconds(), 2298 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2299 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); 2300 2301 AbstractCompiler *comp = compiler(CompLevel_simple); 2302 if (comp != NULL) { 2303 comp->print_timers(); 2304 } 2305 comp = compiler(CompLevel_full_optimization); 2306 if (comp != NULL) { 2307 comp->print_timers(); 2308 } 2309 tty->cr(); 2310 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2311 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2312 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2313 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2314 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2315 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2316 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2317 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2318 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2319 tty->cr(); 2320 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2321 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2322 } 2323 2324 // Debugging output for failure 2325 void CompileBroker::print_last_compile() { 2326 if ( _last_compile_level != CompLevel_none && 2327 compiler(_last_compile_level) != NULL && 2328 _last_method_compiled != NULL && 2329 _last_compile_type != no_compile) { 2330 if (_last_compile_type == osr_compile) { 2331 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2332 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2333 } else { 2334 tty->print_cr("Last parse: %d+++(%d) %s", 2335 _compilation_id, _last_compile_level, _last_method_compiled); 2336 } 2337 } 2338 } 2339 2340 2341 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2342 #ifndef PRODUCT 2343 st->print_cr("Compiler thread printing unimplemented."); 2344 st->cr(); 2345 #endif 2346 }