1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "code/codeCache.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "compiler/compileLog.hpp" 31 #include "compiler/compilerOracle.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/allocation.inline.hpp" 34 #include "oops/methodData.hpp" 35 #include "oops/method.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/nativeLookup.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/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::_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_compile_queue = NULL; 187 CompileQueue* CompileBroker::_c1_compile_queue = 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 p2i(nm), p2i(nm->code_begin()), p2i(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 CompileTask::free(task); 256 } 257 } 258 259 260 CompileTask* CompileTask::_task_free_list = NULL; 261 #ifdef ASSERT 262 int CompileTask::_num_allocated_tasks = 0; 263 #endif 264 /** 265 * Allocate a CompileTask, from the free list if possible. 266 */ 267 CompileTask* CompileTask::allocate() { 268 MutexLocker locker(CompileTaskAlloc_lock); 269 CompileTask* task = NULL; 270 271 if (_task_free_list != NULL) { 272 task = _task_free_list; 273 _task_free_list = task->next(); 274 task->set_next(NULL); 275 } else { 276 task = new CompileTask(); 277 DEBUG_ONLY(_num_allocated_tasks++;) 278 assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?"); 279 task->set_next(NULL); 280 task->set_is_free(true); 281 } 282 assert(task->is_free(), "Task must be free."); 283 task->set_is_free(false); 284 return task; 285 } 286 287 288 /** 289 * Add a task to the free list. 290 */ 291 void CompileTask::free(CompileTask* task) { 292 MutexLocker locker(CompileTaskAlloc_lock); 293 if (!task->is_free()) { 294 task->set_code(NULL); 295 assert(!task->lock()->is_locked(), "Should not be locked when freed"); 296 JNIHandles::destroy_global(task->_method_holder); 297 JNIHandles::destroy_global(task->_hot_method_holder); 298 299 task->set_is_free(true); 300 task->set_next(_task_free_list); 301 _task_free_list = task; 302 } 303 } 304 305 void CompileTask::initialize(int compile_id, 306 methodHandle method, 307 int osr_bci, 308 int comp_level, 309 methodHandle hot_method, 310 int hot_count, 311 const char* comment, 312 bool is_blocking) { 313 assert(!_lock->is_locked(), "bad locking"); 314 315 _compile_id = compile_id; 316 _method = method(); 317 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 318 _osr_bci = osr_bci; 319 _is_blocking = is_blocking; 320 _comp_level = comp_level; 321 _num_inlined_bytecodes = 0; 322 323 _is_complete = false; 324 _is_success = false; 325 _code_handle = NULL; 326 327 _hot_method = NULL; 328 _hot_method_holder = NULL; 329 _hot_count = hot_count; 330 _time_queued = 0; // tidy 331 _comment = comment; 332 _failure_reason = NULL; 333 334 if (LogCompilation) { 335 _time_queued = os::elapsed_counter(); 336 if (hot_method.not_null()) { 337 if (hot_method == method) { 338 _hot_method = _method; 339 } else { 340 _hot_method = hot_method(); 341 // only add loader or mirror if different from _method_holder 342 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 343 } 344 } 345 } 346 347 _next = NULL; 348 } 349 350 // ------------------------------------------------------------------ 351 // CompileTask::code/set_code 352 nmethod* CompileTask::code() const { 353 if (_code_handle == NULL) return NULL; 354 return _code_handle->code(); 355 } 356 void CompileTask::set_code(nmethod* nm) { 357 if (_code_handle == NULL && nm == NULL) return; 358 guarantee(_code_handle != NULL, ""); 359 _code_handle->set_code(nm); 360 if (nm == NULL) _code_handle = NULL; // drop the handle also 361 } 362 363 364 void CompileTask::mark_on_stack() { 365 // Mark these methods as something redefine classes cannot remove. 366 _method->set_on_stack(true); 367 if (_hot_method != NULL) { 368 _hot_method->set_on_stack(true); 369 } 370 } 371 372 // ------------------------------------------------------------------ 373 // CompileTask::print 374 void CompileTask::print() { 375 tty->print("<CompileTask compile_id=%d ", _compile_id); 376 tty->print("method="); 377 _method->print_name(tty); 378 tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>", 379 _osr_bci, bool_to_str(_is_blocking), 380 bool_to_str(_is_complete), bool_to_str(_is_success)); 381 } 382 383 384 // ------------------------------------------------------------------ 385 // CompileTask::print_line_on_error 386 // 387 // This function is called by fatal error handler when the thread 388 // causing troubles is a compiler thread. 389 // 390 // Do not grab any lock, do not allocate memory. 391 // 392 // Otherwise it's the same as CompileTask::print_line() 393 // 394 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 395 // print compiler name 396 st->print("%s:", CompileBroker::compiler_name(comp_level())); 397 print_compilation(st); 398 } 399 400 // ------------------------------------------------------------------ 401 // CompileTask::print_line 402 void CompileTask::print_line() { 403 ttyLocker ttyl; // keep the following output all in one block 404 // print compiler name if requested 405 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 406 print_compilation(); 407 } 408 409 410 // ------------------------------------------------------------------ 411 // CompileTask::print_compilation_impl 412 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 413 bool is_osr_method, int osr_bci, bool is_blocking, 414 const char* msg, bool short_form) { 415 if (!short_form) { 416 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 417 } 418 st->print("%4d ", compile_id); // print compilation number 419 420 // For unloaded methods the transition to zombie occurs after the 421 // method is cleared so it's impossible to report accurate 422 // information for that case. 423 bool is_synchronized = false; 424 bool has_exception_handler = false; 425 bool is_native = false; 426 if (method != NULL) { 427 is_synchronized = method->is_synchronized(); 428 has_exception_handler = method->has_exception_handler(); 429 is_native = method->is_native(); 430 } 431 // method attributes 432 const char compile_type = is_osr_method ? '%' : ' '; 433 const char sync_char = is_synchronized ? 's' : ' '; 434 const char exception_char = has_exception_handler ? '!' : ' '; 435 const char blocking_char = is_blocking ? 'b' : ' '; 436 const char native_char = is_native ? 'n' : ' '; 437 438 // print method attributes 439 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 440 441 if (TieredCompilation) { 442 if (comp_level != -1) st->print("%d ", comp_level); 443 else st->print("- "); 444 } 445 st->print(" "); // more indent 446 447 if (method == NULL) { 448 st->print("(method)"); 449 } else { 450 method->print_short_name(st); 451 if (is_osr_method) { 452 st->print(" @ %d", osr_bci); 453 } 454 if (method->is_native()) 455 st->print(" (native)"); 456 else 457 st->print(" (%d bytes)", method->code_size()); 458 } 459 460 if (msg != NULL) { 461 st->print(" %s", msg); 462 } 463 if (!short_form) { 464 st->cr(); 465 } 466 } 467 468 // ------------------------------------------------------------------ 469 // CompileTask::print_inlining 470 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 471 // 1234567 472 st->print(" "); // print timestamp 473 // 1234 474 st->print(" "); // print compilation number 475 476 // method attributes 477 if (method->is_loaded()) { 478 const char sync_char = method->is_synchronized() ? 's' : ' '; 479 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 480 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 481 482 // print method attributes 483 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 484 } else { 485 // %s!bn 486 st->print(" "); // print method attributes 487 } 488 489 if (TieredCompilation) { 490 st->print(" "); 491 } 492 st->print(" "); // more indent 493 st->print(" "); // initial inlining indent 494 495 for (int i = 0; i < inline_level; i++) st->print(" "); 496 497 st->print("@ %d ", bci); // print bci 498 method->print_short_name(st); 499 if (method->is_loaded()) 500 st->print(" (%d bytes)", method->code_size()); 501 else 502 st->print(" (not loaded)"); 503 504 if (msg != NULL) { 505 st->print(" %s", msg); 506 } 507 st->cr(); 508 } 509 510 // ------------------------------------------------------------------ 511 // CompileTask::print_inline_indent 512 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 513 // 1234567 514 st->print(" "); // print timestamp 515 // 1234 516 st->print(" "); // print compilation number 517 // %s!bn 518 st->print(" "); // print method attributes 519 if (TieredCompilation) { 520 st->print(" "); 521 } 522 st->print(" "); // more indent 523 st->print(" "); // initial inlining indent 524 for (int i = 0; i < inline_level; i++) st->print(" "); 525 } 526 527 // ------------------------------------------------------------------ 528 // CompileTask::print_compilation 529 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) { 530 bool is_osr_method = osr_bci() != InvocationEntryBci; 531 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form); 532 } 533 534 // ------------------------------------------------------------------ 535 // CompileTask::log_task 536 void CompileTask::log_task(xmlStream* log) { 537 Thread* thread = Thread::current(); 538 methodHandle method(thread, this->method()); 539 ResourceMark rm(thread); 540 541 // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'> 542 log->print(" compile_id='%d'", _compile_id); 543 if (_osr_bci != CompileBroker::standard_entry_bci) { 544 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 545 } // else compile_kind='c2c' 546 if (!method.is_null()) log->method(method); 547 if (_osr_bci != CompileBroker::standard_entry_bci) { 548 log->print(" osr_bci='%d'", _osr_bci); 549 } 550 if (_comp_level != CompLevel_highest_tier) { 551 log->print(" level='%d'", _comp_level); 552 } 553 if (_is_blocking) { 554 log->print(" blocking='1'"); 555 } 556 log->stamp(); 557 } 558 559 560 // ------------------------------------------------------------------ 561 // CompileTask::log_task_queued 562 void CompileTask::log_task_queued() { 563 Thread* thread = Thread::current(); 564 ttyLocker ttyl; 565 ResourceMark rm(thread); 566 567 xtty->begin_elem("task_queued"); 568 log_task(xtty); 569 if (_comment != NULL) { 570 xtty->print(" comment='%s'", _comment); 571 } 572 if (_hot_method != NULL) { 573 methodHandle hot(thread, _hot_method); 574 methodHandle method(thread, _method); 575 if (hot() != method()) { 576 xtty->method(hot); 577 } 578 } 579 if (_hot_count != 0) { 580 xtty->print(" hot_count='%d'", _hot_count); 581 } 582 xtty->end_elem(); 583 } 584 585 586 // ------------------------------------------------------------------ 587 // CompileTask::log_task_start 588 void CompileTask::log_task_start(CompileLog* log) { 589 log->begin_head("task"); 590 log_task(log); 591 log->end_head(); 592 } 593 594 595 // ------------------------------------------------------------------ 596 // CompileTask::log_task_done 597 void CompileTask::log_task_done(CompileLog* log) { 598 Thread* thread = Thread::current(); 599 methodHandle method(thread, this->method()); 600 ResourceMark rm(thread); 601 602 if (!_is_success) { 603 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown"; 604 log->elem("failure reason='%s'", reason); 605 } 606 607 // <task_done ... stamp='1.234'> </task> 608 nmethod* nm = code(); 609 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 610 _is_success, nm == NULL ? 0 : nm->content_size(), 611 method->invocation_count()); 612 int bec = method->backedge_count(); 613 if (bec != 0) log->print(" backedge_count='%d'", bec); 614 // Note: "_is_complete" is about to be set, but is not. 615 if (_num_inlined_bytecodes != 0) { 616 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 617 } 618 log->stamp(); 619 log->end_elem(); 620 log->tail("task"); 621 log->clear_identities(); // next task will have different CI 622 if (log->unflushed_count() > 2000) { 623 log->flush(); 624 } 625 log->mark_file_end(); 626 } 627 628 629 630 /** 631 * Add a CompileTask to a CompileQueue 632 */ 633 void CompileQueue::add(CompileTask* task) { 634 assert(lock()->owned_by_self(), "must own lock"); 635 assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever"); 636 637 task->set_next(NULL); 638 task->set_prev(NULL); 639 640 if (_last == NULL) { 641 // The compile queue is empty. 642 assert(_first == NULL, "queue is empty"); 643 _first = task; 644 _last = task; 645 } else { 646 // Append the task to the queue. 647 assert(_last->next() == NULL, "not last"); 648 _last->set_next(task); 649 task->set_prev(_last); 650 _last = task; 651 } 652 ++_size; 653 654 // Mark the method as being in the compile queue. 655 task->method()->set_queued_for_compilation(); 656 657 NOT_PRODUCT(print();) 658 659 if (LogCompilation && xtty != NULL) { 660 task->log_task_queued(); 661 } 662 663 // Notify CompilerThreads that a task is available. 664 lock()->notify_all(); 665 } 666 667 /** 668 * Empties compilation queue by putting all compilation tasks onto 669 * a freelist. Furthermore, the method wakes up all threads that are 670 * waiting on a compilation task to finish. This can happen if background 671 * compilation is disabled. 672 */ 673 void CompileQueue::free_all() { 674 MutexLocker mu(lock()); 675 CompileTask* next = _first; 676 677 // Iterate over all tasks in the compile queue 678 while (next != NULL) { 679 CompileTask* current = next; 680 next = current->next(); 681 { 682 // Wake up thread that blocks on the compile task. 683 MutexLocker ct_lock(current->lock()); 684 current->lock()->notify(); 685 } 686 // Put the task back on the freelist. 687 CompileTask::free(current); 688 } 689 _first = NULL; 690 691 // Wake up all threads that block on the queue. 692 lock()->notify_all(); 693 } 694 695 // ------------------------------------------------------------------ 696 // CompileQueue::get 697 // 698 // Get the next CompileTask from a CompileQueue 699 CompileTask* CompileQueue::get() { 700 NMethodSweeper::possibly_sweep(); 701 702 MutexLocker locker(lock()); 703 // If _first is NULL we have no more compile jobs. There are two reasons for 704 // having no compile jobs: First, we compiled everything we wanted. Second, 705 // we ran out of code cache so compilation has been disabled. In the latter 706 // case we perform code cache sweeps to free memory such that we can re-enable 707 // compilation. 708 while (_first == NULL) { 709 // Exit loop if compilation is disabled forever 710 if (CompileBroker::is_compilation_disabled_forever()) { 711 return NULL; 712 } 713 714 if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) { 715 // Wait a certain amount of time to possibly do another sweep. 716 // We must wait until stack scanning has happened so that we can 717 // transition a method's state from 'not_entrant' to 'zombie'. 718 long wait_time = NmethodSweepCheckInterval * 1000; 719 if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) { 720 // Only one thread at a time can do sweeping. Scale the 721 // wait time according to the number of compiler threads. 722 // As a result, the next sweep is likely to happen every 100ms 723 // with an arbitrary number of threads that do sweeping. 724 wait_time = 100 * CICompilerCount; 725 } 726 bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time); 727 if (timeout) { 728 MutexUnlocker ul(lock()); 729 NMethodSweeper::possibly_sweep(); 730 } 731 } else { 732 // If there are no compilation tasks and we can compile new jobs 733 // (i.e., there is enough free space in the code cache) there is 734 // no need to invoke the sweeper. As a result, the hotness of methods 735 // remains unchanged. This behavior is desired, since we want to keep 736 // the stable state, i.e., we do not want to evict methods from the 737 // code cache if it is unnecessary. 738 // We need a timed wait here, since compiler threads can exit if compilation 739 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 740 // is not critical and we do not want idle compiler threads to wake up too often. 741 lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000); 742 } 743 } 744 745 if (CompileBroker::is_compilation_disabled_forever()) { 746 return NULL; 747 } 748 749 CompileTask* task; 750 { 751 No_Safepoint_Verifier nsv; 752 task = CompilationPolicy::policy()->select_task(this); 753 } 754 remove(task); 755 purge_stale_tasks(); // may temporarily release MCQ lock 756 return task; 757 } 758 759 // Clean & deallocate stale compile tasks. 760 // Temporarily releases MethodCompileQueue lock. 761 void CompileQueue::purge_stale_tasks() { 762 assert(lock()->owned_by_self(), "must own lock"); 763 if (_first_stale != NULL) { 764 // Stale tasks are purged when MCQ lock is released, 765 // but _first_stale updates are protected by MCQ lock. 766 // Once task processing starts and MCQ lock is released, 767 // other compiler threads can reuse _first_stale. 768 CompileTask* head = _first_stale; 769 _first_stale = NULL; 770 { 771 MutexUnlocker ul(lock()); 772 for (CompileTask* task = head; task != NULL; ) { 773 CompileTask* next_task = task->next(); 774 CompileTaskWrapper ctw(task); // Frees the task 775 task->set_failure_reason("stale task"); 776 task = next_task; 777 } 778 } 779 } 780 } 781 782 void CompileQueue::remove(CompileTask* task) { 783 assert(lock()->owned_by_self(), "must own lock"); 784 if (task->prev() != NULL) { 785 task->prev()->set_next(task->next()); 786 } else { 787 // max is the first element 788 assert(task == _first, "Sanity"); 789 _first = task->next(); 790 } 791 792 if (task->next() != NULL) { 793 task->next()->set_prev(task->prev()); 794 } else { 795 // max is the last element 796 assert(task == _last, "Sanity"); 797 _last = task->prev(); 798 } 799 --_size; 800 } 801 802 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 803 assert(lock()->owned_by_self(), "must own lock"); 804 remove(task); 805 806 // Enqueue the task for reclamation (should be done outside MCQ lock) 807 task->set_next(_first_stale); 808 task->set_prev(NULL); 809 _first_stale = task; 810 } 811 812 // methods in the compile queue need to be marked as used on the stack 813 // so that they don't get reclaimed by Redefine Classes 814 void CompileQueue::mark_on_stack() { 815 CompileTask* task = _first; 816 while (task != NULL) { 817 task->mark_on_stack(); 818 task = task->next(); 819 } 820 } 821 822 #ifndef PRODUCT 823 /** 824 * Print entire compilation queue. 825 */ 826 void CompileQueue::print() { 827 if (CIPrintCompileQueue) { 828 ttyLocker ttyl; 829 tty->print_cr("Contents of %s", name()); 830 tty->print_cr("----------------------"); 831 CompileTask* task = _first; 832 while (task != NULL) { 833 task->print_line(); 834 task = task->next(); 835 } 836 tty->print_cr("----------------------"); 837 } 838 } 839 #endif // PRODUCT 840 841 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 842 843 _current_method[0] = '\0'; 844 _compile_type = CompileBroker::no_compile; 845 846 if (UsePerfData) { 847 ResourceMark rm; 848 849 // create the thread instance name space string - don't create an 850 // instance subspace if instance is -1 - keeps the adapterThread 851 // counters from having a ".0" namespace. 852 const char* thread_i = (instance == -1) ? thread_name : 853 PerfDataManager::name_space(thread_name, instance); 854 855 856 char* name = PerfDataManager::counter_name(thread_i, "method"); 857 _perf_current_method = 858 PerfDataManager::create_string_variable(SUN_CI, name, 859 cmname_buffer_length, 860 _current_method, CHECK); 861 862 name = PerfDataManager::counter_name(thread_i, "type"); 863 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 864 PerfData::U_None, 865 (jlong)_compile_type, 866 CHECK); 867 868 name = PerfDataManager::counter_name(thread_i, "time"); 869 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 870 PerfData::U_Ticks, CHECK); 871 872 name = PerfDataManager::counter_name(thread_i, "compiles"); 873 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 874 PerfData::U_Events, CHECK); 875 } 876 } 877 878 // ------------------------------------------------------------------ 879 // CompileBroker::compilation_init 880 // 881 // Initialize the Compilation object 882 void CompileBroker::compilation_init() { 883 _last_method_compiled[0] = '\0'; 884 885 // No need to initialize compilation system if we do not use it. 886 if (!UseCompiler) { 887 return; 888 } 889 #ifndef SHARK 890 // Set the interface to the current compiler(s). 891 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 892 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 893 #ifdef COMPILER1 894 if (c1_count > 0) { 895 _compilers[0] = new Compiler(); 896 } 897 #endif // COMPILER1 898 899 #ifdef COMPILER2 900 if (c2_count > 0) { 901 _compilers[1] = new C2Compiler(); 902 } 903 #endif // COMPILER2 904 905 #else // SHARK 906 int c1_count = 0; 907 int c2_count = 1; 908 909 _compilers[1] = new SharkCompiler(); 910 #endif // SHARK 911 912 // Start the CompilerThreads 913 init_compiler_threads(c1_count, c2_count); 914 // totalTime performance counter is always created as it is required 915 // by the implementation of java.lang.management.CompilationMBean. 916 { 917 EXCEPTION_MARK; 918 _perf_total_compilation = 919 PerfDataManager::create_counter(JAVA_CI, "totalTime", 920 PerfData::U_Ticks, CHECK); 921 } 922 923 924 if (UsePerfData) { 925 926 EXCEPTION_MARK; 927 928 // create the jvmstat performance counters 929 _perf_osr_compilation = 930 PerfDataManager::create_counter(SUN_CI, "osrTime", 931 PerfData::U_Ticks, CHECK); 932 933 _perf_standard_compilation = 934 PerfDataManager::create_counter(SUN_CI, "standardTime", 935 PerfData::U_Ticks, CHECK); 936 937 _perf_total_bailout_count = 938 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 939 PerfData::U_Events, CHECK); 940 941 _perf_total_invalidated_count = 942 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 943 PerfData::U_Events, CHECK); 944 945 _perf_total_compile_count = 946 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 947 PerfData::U_Events, CHECK); 948 _perf_total_osr_compile_count = 949 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 950 PerfData::U_Events, CHECK); 951 952 _perf_total_standard_compile_count = 953 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 954 PerfData::U_Events, CHECK); 955 956 _perf_sum_osr_bytes_compiled = 957 PerfDataManager::create_counter(SUN_CI, "osrBytes", 958 PerfData::U_Bytes, CHECK); 959 960 _perf_sum_standard_bytes_compiled = 961 PerfDataManager::create_counter(SUN_CI, "standardBytes", 962 PerfData::U_Bytes, CHECK); 963 964 _perf_sum_nmethod_size = 965 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 966 PerfData::U_Bytes, CHECK); 967 968 _perf_sum_nmethod_code_size = 969 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 970 PerfData::U_Bytes, CHECK); 971 972 _perf_last_method = 973 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 974 CompilerCounters::cmname_buffer_length, 975 "", CHECK); 976 977 _perf_last_failed_method = 978 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 979 CompilerCounters::cmname_buffer_length, 980 "", CHECK); 981 982 _perf_last_invalidated_method = 983 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 984 CompilerCounters::cmname_buffer_length, 985 "", CHECK); 986 987 _perf_last_compile_type = 988 PerfDataManager::create_variable(SUN_CI, "lastType", 989 PerfData::U_None, 990 (jlong)CompileBroker::no_compile, 991 CHECK); 992 993 _perf_last_compile_size = 994 PerfDataManager::create_variable(SUN_CI, "lastSize", 995 PerfData::U_Bytes, 996 (jlong)CompileBroker::no_compile, 997 CHECK); 998 999 1000 _perf_last_failed_type = 1001 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 1002 PerfData::U_None, 1003 (jlong)CompileBroker::no_compile, 1004 CHECK); 1005 1006 _perf_last_invalidated_type = 1007 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 1008 PerfData::U_None, 1009 (jlong)CompileBroker::no_compile, 1010 CHECK); 1011 } 1012 1013 _initialized = true; 1014 } 1015 1016 1017 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 1018 AbstractCompiler* comp, TRAPS) { 1019 CompilerThread* compiler_thread = NULL; 1020 1021 Klass* k = 1022 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), 1023 true, CHECK_0); 1024 instanceKlassHandle klass (THREAD, k); 1025 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 1026 Handle string = java_lang_String::create_from_str(name, CHECK_0); 1027 1028 // Initialize thread_oop to put it into the system threadGroup 1029 Handle thread_group (THREAD, Universe::system_thread_group()); 1030 JavaValue result(T_VOID); 1031 JavaCalls::call_special(&result, thread_oop, 1032 klass, 1033 vmSymbols::object_initializer_name(), 1034 vmSymbols::threadgroup_string_void_signature(), 1035 thread_group, 1036 string, 1037 CHECK_0); 1038 1039 { 1040 MutexLocker mu(Threads_lock, THREAD); 1041 compiler_thread = new CompilerThread(queue, counters); 1042 // At this point the new CompilerThread data-races with this startup 1043 // thread (which I believe is the primoridal thread and NOT the VM 1044 // thread). This means Java bytecodes being executed at startup can 1045 // queue compile jobs which will run at whatever default priority the 1046 // newly created CompilerThread runs at. 1047 1048 1049 // At this point it may be possible that no osthread was created for the 1050 // JavaThread due to lack of memory. We would have to throw an exception 1051 // in that case. However, since this must work and we do not allow 1052 // exceptions anyway, check and abort if this fails. 1053 1054 if (compiler_thread == NULL || compiler_thread->osthread() == NULL){ 1055 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1056 "unable to create new native thread"); 1057 } 1058 1059 java_lang_Thread::set_thread(thread_oop(), compiler_thread); 1060 1061 // Note that this only sets the JavaThread _priority field, which by 1062 // definition is limited to Java priorities and not OS priorities. 1063 // The os-priority is set in the CompilerThread startup code itself 1064 1065 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1066 1067 // Note that we cannot call os::set_priority because it expects Java 1068 // priorities and we are *explicitly* using OS priorities so that it's 1069 // possible to set the compiler thread priority higher than any Java 1070 // thread. 1071 1072 int native_prio = CompilerThreadPriority; 1073 if (native_prio == -1) { 1074 if (UseCriticalCompilerThreadPriority) { 1075 native_prio = os::java_to_os_priority[CriticalPriority]; 1076 } else { 1077 native_prio = os::java_to_os_priority[NearMaxPriority]; 1078 } 1079 } 1080 os::set_native_priority(compiler_thread, native_prio); 1081 1082 java_lang_Thread::set_daemon(thread_oop()); 1083 1084 compiler_thread->set_threadObj(thread_oop()); 1085 compiler_thread->set_compiler(comp); 1086 Threads::add(compiler_thread); 1087 Thread::start(compiler_thread); 1088 } 1089 1090 // Let go of Threads_lock before yielding 1091 os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1092 1093 return compiler_thread; 1094 } 1095 1096 1097 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) { 1098 EXCEPTION_MARK; 1099 #if !defined(ZERO) && !defined(SHARK) 1100 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1101 #endif // !ZERO && !SHARK 1102 // Initialize the compilation queue 1103 if (c2_compiler_count > 0) { 1104 _c2_compile_queue = new CompileQueue("C2 CompileQueue", MethodCompileQueue_lock); 1105 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1106 } 1107 if (c1_compiler_count > 0) { 1108 _c1_compile_queue = new CompileQueue("C1 CompileQueue", MethodCompileQueue_lock); 1109 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1110 } 1111 1112 int compiler_count = c1_compiler_count + c2_compiler_count; 1113 1114 _compiler_threads = 1115 new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true); 1116 1117 char name_buffer[256]; 1118 for (int i = 0; i < c2_compiler_count; i++) { 1119 // Create a name for our thread. 1120 sprintf(name_buffer, "C2 CompilerThread%d", i); 1121 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1122 // Shark and C2 1123 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK); 1124 _compiler_threads->append(new_thread); 1125 } 1126 1127 for (int i = c2_compiler_count; i < compiler_count; i++) { 1128 // Create a name for our thread. 1129 sprintf(name_buffer, "C1 CompilerThread%d", i); 1130 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1131 // C1 1132 CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK); 1133 _compiler_threads->append(new_thread); 1134 } 1135 1136 if (UsePerfData) { 1137 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1138 } 1139 } 1140 1141 1142 /** 1143 * Set the methods on the stack as on_stack so that redefine classes doesn't 1144 * reclaim them. This method is executed at a safepoint. 1145 */ 1146 void CompileBroker::mark_on_stack() { 1147 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1148 // Since we are at a safepoint, we do not need a lock to access 1149 // the compile queues. 1150 if (_c2_compile_queue != NULL) { 1151 _c2_compile_queue->mark_on_stack(); 1152 } 1153 if (_c1_compile_queue != NULL) { 1154 _c1_compile_queue->mark_on_stack(); 1155 } 1156 } 1157 1158 // ------------------------------------------------------------------ 1159 // CompileBroker::compile_method 1160 // 1161 // Request compilation of a method. 1162 void CompileBroker::compile_method_base(methodHandle method, 1163 int osr_bci, 1164 int comp_level, 1165 methodHandle hot_method, 1166 int hot_count, 1167 const char* comment, 1168 Thread* thread) { 1169 // do nothing if compiler thread(s) is not available 1170 if (!_initialized) { 1171 return; 1172 } 1173 1174 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1175 assert(method->method_holder()->oop_is_instance(), 1176 "sanity check"); 1177 assert(!method->method_holder()->is_not_initialized(), 1178 "method holder must be initialized"); 1179 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1180 1181 if (CIPrintRequests) { 1182 tty->print("request: "); 1183 method->print_short_name(tty); 1184 if (osr_bci != InvocationEntryBci) { 1185 tty->print(" osr_bci: %d", osr_bci); 1186 } 1187 tty->print(" comment: %s count: %d", comment, hot_count); 1188 if (!hot_method.is_null()) { 1189 tty->print(" hot: "); 1190 if (hot_method() != method()) { 1191 hot_method->print_short_name(tty); 1192 } else { 1193 tty->print("yes"); 1194 } 1195 } 1196 tty->cr(); 1197 } 1198 1199 // A request has been made for compilation. Before we do any 1200 // real work, check to see if the method has been compiled 1201 // in the meantime with a definitive result. 1202 if (compilation_is_complete(method, osr_bci, comp_level)) { 1203 return; 1204 } 1205 1206 #ifndef PRODUCT 1207 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1208 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1209 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1210 return; 1211 } 1212 } 1213 #endif 1214 1215 // If this method is already in the compile queue, then 1216 // we do not block the current thread. 1217 if (compilation_is_in_queue(method)) { 1218 // We may want to decay our counter a bit here to prevent 1219 // multiple denied requests for compilation. This is an 1220 // open compilation policy issue. Note: The other possibility, 1221 // in the case that this is a blocking compile request, is to have 1222 // all subsequent blocking requesters wait for completion of 1223 // ongoing compiles. Note that in this case we'll need a protocol 1224 // for freeing the associated compile tasks. [Or we could have 1225 // a single static monitor on which all these waiters sleep.] 1226 return; 1227 } 1228 1229 // If the requesting thread is holding the pending list lock 1230 // then we just return. We can't risk blocking while holding 1231 // the pending list lock or a 3-way deadlock may occur 1232 // between the reference handler thread, a GC (instigated 1233 // by a compiler thread), and compiled method registration. 1234 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1235 return; 1236 } 1237 1238 if (TieredCompilation) { 1239 // Tiered policy requires MethodCounters to exist before adding a method to 1240 // the queue. Create if we don't have them yet. 1241 method->get_method_counters(thread); 1242 } 1243 1244 // Outputs from the following MutexLocker block: 1245 CompileTask* task = NULL; 1246 bool blocking = false; 1247 CompileQueue* queue = compile_queue(comp_level); 1248 1249 // Acquire our lock. 1250 { 1251 MutexLocker locker(queue->lock(), thread); 1252 1253 // Make sure the method has not slipped into the queues since 1254 // last we checked; note that those checks were "fast bail-outs". 1255 // Here we need to be more careful, see 14012000 below. 1256 if (compilation_is_in_queue(method)) { 1257 return; 1258 } 1259 1260 // We need to check again to see if the compilation has 1261 // completed. A previous compilation may have registered 1262 // some result. 1263 if (compilation_is_complete(method, osr_bci, comp_level)) { 1264 return; 1265 } 1266 1267 // We now know that this compilation is not pending, complete, 1268 // or prohibited. Assign a compile_id to this compilation 1269 // and check to see if it is in our [Start..Stop) range. 1270 int compile_id = assign_compile_id(method, osr_bci); 1271 if (compile_id == 0) { 1272 // The compilation falls outside the allowed range. 1273 return; 1274 } 1275 1276 // Should this thread wait for completion of the compile? 1277 blocking = is_compile_blocking(); 1278 1279 // We will enter the compilation in the queue. 1280 // 14012000: Note that this sets the queued_for_compile bits in 1281 // the target method. We can now reason that a method cannot be 1282 // queued for compilation more than once, as follows: 1283 // Before a thread queues a task for compilation, it first acquires 1284 // the compile queue lock, then checks if the method's queued bits 1285 // are set or it has already been compiled. Thus there can not be two 1286 // instances of a compilation task for the same method on the 1287 // compilation queue. Consider now the case where the compilation 1288 // thread has already removed a task for that method from the queue 1289 // and is in the midst of compiling it. In this case, the 1290 // queued_for_compile bits must be set in the method (and these 1291 // will be visible to the current thread, since the bits were set 1292 // under protection of the compile queue lock, which we hold now. 1293 // When the compilation completes, the compiler thread first sets 1294 // the compilation result and then clears the queued_for_compile 1295 // bits. Neither of these actions are protected by a barrier (or done 1296 // under the protection of a lock), so the only guarantee we have 1297 // (on machines with TSO (Total Store Order)) is that these values 1298 // will update in that order. As a result, the only combinations of 1299 // these bits that the current thread will see are, in temporal order: 1300 // <RESULT, QUEUE> : 1301 // <0, 1> : in compile queue, but not yet compiled 1302 // <1, 1> : compiled but queue bit not cleared 1303 // <1, 0> : compiled and queue bit cleared 1304 // Because we first check the queue bits then check the result bits, 1305 // we are assured that we cannot introduce a duplicate task. 1306 // Note that if we did the tests in the reverse order (i.e. check 1307 // result then check queued bit), we could get the result bit before 1308 // the compilation completed, and the queue bit after the compilation 1309 // completed, and end up introducing a "duplicate" (redundant) task. 1310 // In that case, the compiler thread should first check if a method 1311 // has already been compiled before trying to compile it. 1312 // NOTE: in the event that there are multiple compiler threads and 1313 // there is de-optimization/recompilation, things will get hairy, 1314 // and in that case it's best to protect both the testing (here) of 1315 // these bits, and their updating (here and elsewhere) under a 1316 // common lock. 1317 task = create_compile_task(queue, 1318 compile_id, method, 1319 osr_bci, comp_level, 1320 hot_method, hot_count, comment, 1321 blocking); 1322 } 1323 1324 if (blocking) { 1325 wait_for_completion(task); 1326 } 1327 } 1328 1329 1330 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1331 int comp_level, 1332 methodHandle hot_method, int hot_count, 1333 const char* comment, Thread* THREAD) { 1334 // make sure arguments make sense 1335 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1336 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1337 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1338 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1339 // allow any levels for WhiteBox 1340 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1341 // return quickly if possible 1342 1343 // lock, make sure that the compilation 1344 // isn't prohibited in a straightforward way. 1345 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 1346 if (comp == NULL || !comp->can_compile_method(method) || 1347 compilation_is_prohibited(method, osr_bci, comp_level)) { 1348 return NULL; 1349 } 1350 1351 if (osr_bci == InvocationEntryBci) { 1352 // standard compilation 1353 nmethod* method_code = method->code(); 1354 if (method_code != NULL) { 1355 if (compilation_is_complete(method, osr_bci, comp_level)) { 1356 return method_code; 1357 } 1358 } 1359 if (method->is_not_compilable(comp_level)) { 1360 return NULL; 1361 } 1362 } else { 1363 // osr compilation 1364 #ifndef TIERED 1365 // seems like an assert of dubious value 1366 assert(comp_level == CompLevel_highest_tier, 1367 "all OSR compiles are assumed to be at a single compilation lavel"); 1368 #endif // TIERED 1369 // We accept a higher level osr method 1370 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1371 if (nm != NULL) return nm; 1372 if (method->is_not_osr_compilable(comp_level)) return NULL; 1373 } 1374 1375 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1376 // some prerequisites that are compiler specific 1377 if (comp->is_c2() || comp->is_shark()) { 1378 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1379 // Resolve all classes seen in the signature of the method 1380 // we are compiling. 1381 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1382 } 1383 1384 // If the method is native, do the lookup in the thread requesting 1385 // the compilation. Native lookups can load code, which is not 1386 // permitted during compilation. 1387 // 1388 // Note: A native method implies non-osr compilation which is 1389 // checked with an assertion at the entry of this method. 1390 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1391 bool in_base_library; 1392 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1393 if (HAS_PENDING_EXCEPTION) { 1394 // In case of an exception looking up the method, we just forget 1395 // about it. The interpreter will kick-in and throw the exception. 1396 method->set_not_compilable(); // implies is_not_osr_compilable() 1397 CLEAR_PENDING_EXCEPTION; 1398 return NULL; 1399 } 1400 assert(method->has_native_function(), "must have native code by now"); 1401 } 1402 1403 // RedefineClasses() has replaced this method; just return 1404 if (method->is_old()) { 1405 return NULL; 1406 } 1407 1408 // JVMTI -- post_compile_event requires jmethod_id() that may require 1409 // a lock the compiling thread can not acquire. Prefetch it here. 1410 if (JvmtiExport::should_post_compiled_method_load()) { 1411 method->jmethod_id(); 1412 } 1413 1414 // do the compilation 1415 if (method->is_native()) { 1416 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1417 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1418 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1419 // 1420 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1421 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1422 AdapterHandlerLibrary::create_native_wrapper(method); 1423 } else { 1424 return NULL; 1425 } 1426 } else { 1427 // If the compiler is shut off due to code cache getting full 1428 // fail out now so blocking compiles dont hang the java thread 1429 if (!should_compile_new_jobs()) { 1430 CompilationPolicy::policy()->delay_compilation(method()); 1431 return NULL; 1432 } 1433 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1434 } 1435 1436 // return requested nmethod 1437 // We accept a higher level osr method 1438 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1439 } 1440 1441 1442 // ------------------------------------------------------------------ 1443 // CompileBroker::compilation_is_complete 1444 // 1445 // See if compilation of this method is already complete. 1446 bool CompileBroker::compilation_is_complete(methodHandle method, 1447 int osr_bci, 1448 int comp_level) { 1449 bool is_osr = (osr_bci != standard_entry_bci); 1450 if (is_osr) { 1451 if (method->is_not_osr_compilable(comp_level)) { 1452 return true; 1453 } else { 1454 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1455 return (result != NULL); 1456 } 1457 } else { 1458 if (method->is_not_compilable(comp_level)) { 1459 return true; 1460 } else { 1461 nmethod* result = method->code(); 1462 if (result == NULL) return false; 1463 return comp_level == result->comp_level(); 1464 } 1465 } 1466 } 1467 1468 1469 /** 1470 * See if this compilation is already requested. 1471 * 1472 * Implementation note: there is only a single "is in queue" bit 1473 * for each method. This means that the check below is overly 1474 * conservative in the sense that an osr compilation in the queue 1475 * will block a normal compilation from entering the queue (and vice 1476 * versa). This can be remedied by a full queue search to disambiguate 1477 * cases. If it is deemed profitable, this may be done. 1478 */ 1479 bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1480 return method->queued_for_compilation(); 1481 } 1482 1483 // ------------------------------------------------------------------ 1484 // CompileBroker::compilation_is_prohibited 1485 // 1486 // See if this compilation is not allowed. 1487 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1488 bool is_native = method->is_native(); 1489 // Some compilers may not support the compilation of natives. 1490 AbstractCompiler *comp = compiler(comp_level); 1491 if (is_native && 1492 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1493 method->set_not_compilable_quietly(comp_level); 1494 return true; 1495 } 1496 1497 bool is_osr = (osr_bci != standard_entry_bci); 1498 // Some compilers may not support on stack replacement. 1499 if (is_osr && 1500 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1501 method->set_not_osr_compilable(comp_level); 1502 return true; 1503 } 1504 1505 // The method may be explicitly excluded by the user. 1506 bool quietly; 1507 if (CompilerOracle::should_exclude(method, quietly)) { 1508 if (!quietly) { 1509 // This does not happen quietly... 1510 ResourceMark rm; 1511 tty->print("### Excluding %s:%s", 1512 method->is_native() ? "generation of native wrapper" : "compile", 1513 (method->is_static() ? " static" : "")); 1514 method->print_short_name(tty); 1515 tty->cr(); 1516 } 1517 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1518 } 1519 1520 return false; 1521 } 1522 1523 /** 1524 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1525 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1526 * The function also allows to generate separate compilation IDs for OSR compilations. 1527 */ 1528 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1529 #ifdef ASSERT 1530 bool is_osr = (osr_bci != standard_entry_bci); 1531 int id; 1532 if (method->is_native()) { 1533 assert(!is_osr, "can't be osr"); 1534 // Adapters, native wrappers and method handle intrinsics 1535 // should be generated always. 1536 return Atomic::add(1, &_compilation_id); 1537 } else if (CICountOSR && is_osr) { 1538 id = Atomic::add(1, &_osr_compilation_id); 1539 if (CIStartOSR <= id && id < CIStopOSR) { 1540 return id; 1541 } 1542 } else { 1543 id = Atomic::add(1, &_compilation_id); 1544 if (CIStart <= id && id < CIStop) { 1545 return id; 1546 } 1547 } 1548 1549 // Method was not in the appropriate compilation range. 1550 method->set_not_compilable_quietly(); 1551 return 0; 1552 #else 1553 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1554 // only _compilation_id is incremented. 1555 return Atomic::add(1, &_compilation_id); 1556 #endif 1557 } 1558 1559 /** 1560 * Should the current thread block until this compilation request 1561 * has been fulfilled? 1562 */ 1563 bool CompileBroker::is_compile_blocking() { 1564 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1565 return !BackgroundCompilation; 1566 } 1567 1568 1569 // ------------------------------------------------------------------ 1570 // CompileBroker::preload_classes 1571 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1572 // Move this code over from c1_Compiler.cpp 1573 ShouldNotReachHere(); 1574 } 1575 1576 1577 // ------------------------------------------------------------------ 1578 // CompileBroker::create_compile_task 1579 // 1580 // Create a CompileTask object representing the current request for 1581 // compilation. Add this task to the queue. 1582 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue, 1583 int compile_id, 1584 methodHandle method, 1585 int osr_bci, 1586 int comp_level, 1587 methodHandle hot_method, 1588 int hot_count, 1589 const char* comment, 1590 bool blocking) { 1591 CompileTask* new_task = CompileTask::allocate(); 1592 new_task->initialize(compile_id, method, osr_bci, comp_level, 1593 hot_method, hot_count, comment, 1594 blocking); 1595 queue->add(new_task); 1596 return new_task; 1597 } 1598 1599 1600 /** 1601 * Wait for the compilation task to complete. 1602 */ 1603 void CompileBroker::wait_for_completion(CompileTask* task) { 1604 if (CIPrintCompileQueue) { 1605 ttyLocker ttyl; 1606 tty->print_cr("BLOCKING FOR COMPILE"); 1607 } 1608 1609 assert(task->is_blocking(), "can only wait on blocking task"); 1610 1611 JavaThread* thread = JavaThread::current(); 1612 thread->set_blocked_on_compilation(true); 1613 1614 methodHandle method(thread, task->method()); 1615 { 1616 MutexLocker waiter(task->lock(), thread); 1617 1618 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1619 task->lock()->wait(); 1620 } 1621 } 1622 1623 thread->set_blocked_on_compilation(false); 1624 if (is_compilation_disabled_forever()) { 1625 CompileTask::free(task); 1626 return; 1627 } 1628 1629 // It is harmless to check this status without the lock, because 1630 // completion is a stable property (until the task object is recycled). 1631 assert(task->is_complete(), "Compilation should have completed"); 1632 assert(task->code_handle() == NULL, "must be reset"); 1633 1634 // By convention, the waiter is responsible for recycling a 1635 // blocking CompileTask. Since there is only one waiter ever 1636 // waiting on a CompileTask, we know that no one else will 1637 // be using this CompileTask; we can free it. 1638 CompileTask::free(task); 1639 } 1640 1641 /** 1642 * Initialize compiler thread(s) + compiler object(s). The postcondition 1643 * of this function is that the compiler runtimes are initialized and that 1644 * compiler threads can start compiling. 1645 */ 1646 bool CompileBroker::init_compiler_runtime() { 1647 CompilerThread* thread = CompilerThread::current(); 1648 AbstractCompiler* comp = thread->compiler(); 1649 // Final sanity check - the compiler object must exist 1650 guarantee(comp != NULL, "Compiler object must exist"); 1651 1652 int system_dictionary_modification_counter; 1653 { 1654 MutexLocker locker(Compile_lock, thread); 1655 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1656 } 1657 1658 { 1659 // Must switch to native to allocate ci_env 1660 ThreadToNativeFromVM ttn(thread); 1661 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1662 // Cache Jvmti state 1663 ci_env.cache_jvmti_state(); 1664 // Cache DTrace flags 1665 ci_env.cache_dtrace_flags(); 1666 1667 // Switch back to VM state to do compiler initialization 1668 ThreadInVMfromNative tv(thread); 1669 ResetNoHandleMark rnhm; 1670 1671 1672 if (!comp->is_shark()) { 1673 // Perform per-thread and global initializations 1674 comp->initialize(); 1675 } 1676 } 1677 1678 if (comp->is_failed()) { 1679 disable_compilation_forever(); 1680 // If compiler initialization failed, no compiler thread that is specific to a 1681 // particular compiler runtime will ever start to compile methods. 1682 shutdown_compiler_runtime(comp, thread); 1683 return false; 1684 } 1685 1686 // C1 specific check 1687 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1688 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1689 return false; 1690 } 1691 1692 return true; 1693 } 1694 1695 /** 1696 * If C1 and/or C2 initialization failed, we shut down all compilation. 1697 * We do this to keep things simple. This can be changed if it ever turns 1698 * out to be a problem. 1699 */ 1700 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) { 1701 // Free buffer blob, if allocated 1702 if (thread->get_buffer_blob() != NULL) { 1703 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1704 CodeCache::free(thread->get_buffer_blob()); 1705 } 1706 1707 if (comp->should_perform_shutdown()) { 1708 // There are two reasons for shutting down the compiler 1709 // 1) compiler runtime initialization failed 1710 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1711 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1712 1713 // Only one thread per compiler runtime object enters here 1714 // Set state to shut down 1715 comp->set_shut_down(); 1716 1717 // Delete all queued compilation tasks to make compiler threads exit faster. 1718 if (_c1_compile_queue != NULL) { 1719 _c1_compile_queue->free_all(); 1720 } 1721 1722 if (_c2_compile_queue != NULL) { 1723 _c2_compile_queue->free_all(); 1724 } 1725 1726 // Set flags so that we continue execution with using interpreter only. 1727 UseCompiler = false; 1728 UseInterpreter = true; 1729 1730 // We could delete compiler runtimes also. However, there are references to 1731 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1732 // fail. This can be done later if necessary. 1733 } 1734 } 1735 1736 // ------------------------------------------------------------------ 1737 // CompileBroker::compiler_thread_loop 1738 // 1739 // The main loop run by a CompilerThread. 1740 void CompileBroker::compiler_thread_loop() { 1741 CompilerThread* thread = CompilerThread::current(); 1742 CompileQueue* queue = thread->queue(); 1743 // For the thread that initializes the ciObjectFactory 1744 // this resource mark holds all the shared objects 1745 ResourceMark rm; 1746 1747 // First thread to get here will initialize the compiler interface 1748 1749 if (!ciObjectFactory::is_initialized()) { 1750 ASSERT_IN_VM; 1751 MutexLocker only_one (CompileThread_lock, thread); 1752 if (!ciObjectFactory::is_initialized()) { 1753 ciObjectFactory::initialize(); 1754 } 1755 } 1756 1757 // Open a log. 1758 if (LogCompilation) { 1759 init_compiler_thread_log(); 1760 } 1761 CompileLog* log = thread->log(); 1762 if (log != NULL) { 1763 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1764 thread->name(), 1765 os::current_thread_id(), 1766 os::current_process_id()); 1767 log->stamp(); 1768 log->end_elem(); 1769 } 1770 1771 // If compiler thread/runtime initialization fails, exit the compiler thread 1772 if (!init_compiler_runtime()) { 1773 return; 1774 } 1775 1776 // Poll for new compilation tasks as long as the JVM runs. Compilation 1777 // should only be disabled if something went wrong while initializing the 1778 // compiler runtimes. This, in turn, should not happen. The only known case 1779 // when compiler runtime initialization fails is if there is not enough free 1780 // space in the code cache to generate the necessary stubs, etc. 1781 while (!is_compilation_disabled_forever()) { 1782 // We need this HandleMark to avoid leaking VM handles. 1783 HandleMark hm(thread); 1784 1785 if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) { 1786 // the code cache is really full 1787 handle_full_code_cache(); 1788 } 1789 1790 CompileTask* task = queue->get(); 1791 if (task == NULL) { 1792 continue; 1793 } 1794 1795 // Give compiler threads an extra quanta. They tend to be bursty and 1796 // this helps the compiler to finish up the job. 1797 if( CompilerThreadHintNoPreempt ) 1798 os::hint_no_preempt(); 1799 1800 // trace per thread time and compile statistics 1801 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1802 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1803 1804 // Assign the task to the current thread. Mark this compilation 1805 // thread as active for the profiler. 1806 CompileTaskWrapper ctw(task); 1807 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1808 task->set_code_handle(&result_handle); 1809 methodHandle method(thread, task->method()); 1810 1811 // Never compile a method if breakpoints are present in it 1812 if (method()->number_of_breakpoints() == 0) { 1813 // Compile the method. 1814 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1815 invoke_compiler_on_method(task); 1816 } else { 1817 // After compilation is disabled, remove remaining methods from queue 1818 method->clear_queued_for_compilation(); 1819 task->set_failure_reason("compilation is disabled"); 1820 } 1821 } 1822 } 1823 1824 // Shut down compiler runtime 1825 shutdown_compiler_runtime(thread->compiler(), thread); 1826 } 1827 1828 // ------------------------------------------------------------------ 1829 // CompileBroker::init_compiler_thread_log 1830 // 1831 // Set up state required by +LogCompilation. 1832 void CompileBroker::init_compiler_thread_log() { 1833 CompilerThread* thread = CompilerThread::current(); 1834 char file_name[4*K]; 1835 FILE* fp = NULL; 1836 intx thread_id = os::current_thread_id(); 1837 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1838 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1839 if (dir == NULL) { 1840 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1841 thread_id, os::current_process_id()); 1842 } else { 1843 jio_snprintf(file_name, sizeof(file_name), 1844 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1845 os::file_separator(), thread_id, os::current_process_id()); 1846 } 1847 1848 fp = fopen(file_name, "wt"); 1849 if (fp != NULL) { 1850 if (LogCompilation && Verbose) { 1851 tty->print_cr("Opening compilation log %s", file_name); 1852 } 1853 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1854 if (log == NULL) { 1855 fclose(fp); 1856 return; 1857 } 1858 thread->init_log(log); 1859 1860 if (xtty != NULL) { 1861 ttyLocker ttyl; 1862 // Record any per thread log files 1863 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1864 } 1865 return; 1866 } 1867 } 1868 warning("Cannot open log file: %s", file_name); 1869 } 1870 1871 // ------------------------------------------------------------------ 1872 // CompileBroker::set_should_block 1873 // 1874 // Set _should_block. 1875 // Call this from the VM, with Threads_lock held and a safepoint requested. 1876 void CompileBroker::set_should_block() { 1877 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1878 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1879 #ifndef PRODUCT 1880 if (PrintCompilation && (Verbose || WizardMode)) 1881 tty->print_cr("notifying compiler thread pool to block"); 1882 #endif 1883 _should_block = true; 1884 } 1885 1886 // ------------------------------------------------------------------ 1887 // CompileBroker::maybe_block 1888 // 1889 // Call this from the compiler at convenient points, to poll for _should_block. 1890 void CompileBroker::maybe_block() { 1891 if (_should_block) { 1892 #ifndef PRODUCT 1893 if (PrintCompilation && (Verbose || WizardMode)) 1894 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1895 #endif 1896 ThreadInVMfromNative tivfn(JavaThread::current()); 1897 } 1898 } 1899 1900 // wrapper for CodeCache::print_summary() 1901 static void codecache_print(bool detailed) 1902 { 1903 ResourceMark rm; 1904 stringStream s; 1905 // Dump code cache into a buffer before locking the tty, 1906 { 1907 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1908 CodeCache::print_summary(&s, detailed); 1909 } 1910 ttyLocker ttyl; 1911 tty->print("%s", s.as_string()); 1912 } 1913 1914 // ------------------------------------------------------------------ 1915 // CompileBroker::invoke_compiler_on_method 1916 // 1917 // Compile a method. 1918 // 1919 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1920 if (PrintCompilation) { 1921 ResourceMark rm; 1922 task->print_line(); 1923 } 1924 elapsedTimer time; 1925 1926 CompilerThread* thread = CompilerThread::current(); 1927 ResourceMark rm(thread); 1928 1929 if (LogEvents) { 1930 _compilation_log->log_compile(thread, task); 1931 } 1932 1933 // Common flags. 1934 uint compile_id = task->compile_id(); 1935 int osr_bci = task->osr_bci(); 1936 bool is_osr = (osr_bci != standard_entry_bci); 1937 bool should_log = (thread->log() != NULL); 1938 bool should_break = false; 1939 int task_level = task->comp_level(); 1940 { 1941 // create the handle inside it's own block so it can't 1942 // accidentally be referenced once the thread transitions to 1943 // native. The NoHandleMark before the transition should catch 1944 // any cases where this occurs in the future. 1945 methodHandle method(thread, task->method()); 1946 should_break = check_break_at(method, compile_id, is_osr); 1947 if (should_log && !CompilerOracle::should_log(method)) { 1948 should_log = false; 1949 } 1950 assert(!method->is_native(), "no longer compile natives"); 1951 1952 // Save information about this method in case of failure. 1953 set_last_compile(thread, method, is_osr, task_level); 1954 1955 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1956 } 1957 1958 // Allocate a new set of JNI handles. 1959 push_jni_handle_block(); 1960 Method* target_handle = task->method(); 1961 int compilable = ciEnv::MethodCompilable; 1962 { 1963 int system_dictionary_modification_counter; 1964 { 1965 MutexLocker locker(Compile_lock, thread); 1966 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1967 } 1968 1969 NoHandleMark nhm; 1970 ThreadToNativeFromVM ttn(thread); 1971 1972 ciEnv ci_env(task, system_dictionary_modification_counter); 1973 if (should_break) { 1974 ci_env.set_break_at_compile(true); 1975 } 1976 if (should_log) { 1977 ci_env.set_log(thread->log()); 1978 } 1979 assert(thread->env() == &ci_env, "set by ci_env"); 1980 // The thread-env() field is cleared in ~CompileTaskWrapper. 1981 1982 // Cache Jvmti state 1983 ci_env.cache_jvmti_state(); 1984 1985 // Cache DTrace flags 1986 ci_env.cache_dtrace_flags(); 1987 1988 ciMethod* target = ci_env.get_method_from_handle(target_handle); 1989 1990 TraceTime t1("compilation", &time); 1991 EventCompilation event; 1992 1993 AbstractCompiler *comp = compiler(task_level); 1994 if (comp == NULL) { 1995 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 1996 } else { 1997 comp->compile_method(&ci_env, target, osr_bci); 1998 } 1999 2000 if (!ci_env.failing() && task->code() == NULL) { 2001 //assert(false, "compiler should always document failure"); 2002 // The compiler elected, without comment, not to register a result. 2003 // Do not attempt further compilations of this method. 2004 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 2005 } 2006 2007 // Copy this bit to the enclosing block: 2008 compilable = ci_env.compilable(); 2009 2010 if (ci_env.failing()) { 2011 task->set_failure_reason(ci_env.failure_reason()); 2012 const char* retry_message = ci_env.retry_message(); 2013 if (_compilation_log != NULL) { 2014 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 2015 } 2016 if (PrintCompilation) { 2017 FormatBufferResource msg = retry_message != NULL ? 2018 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 2019 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 2020 task->print_compilation(tty, msg); 2021 } 2022 } else { 2023 task->mark_success(); 2024 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 2025 if (_compilation_log != NULL) { 2026 nmethod* code = task->code(); 2027 if (code != NULL) { 2028 _compilation_log->log_nmethod(thread, code); 2029 } 2030 } 2031 } 2032 // simulate crash during compilation 2033 assert(task->compile_id() != CICrashAt, "just as planned"); 2034 if (event.should_commit()) { 2035 event.set_method(target->get_Method()); 2036 event.set_compileID(compile_id); 2037 event.set_compileLevel(task->comp_level()); 2038 event.set_succeded(task->is_success()); 2039 event.set_isOsr(is_osr); 2040 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 2041 event.set_inlinedBytes(task->num_inlined_bytecodes()); 2042 event.commit(); 2043 } 2044 } 2045 pop_jni_handle_block(); 2046 2047 methodHandle method(thread, task->method()); 2048 2049 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2050 2051 collect_statistics(thread, time, task); 2052 2053 if (PrintCompilation && PrintCompilation2) { 2054 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2055 tty->print("%4d ", compile_id); // print compilation number 2056 tty->print("%s ", (is_osr ? "%" : " ")); 2057 if (task->code() != NULL) { 2058 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2059 } 2060 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2061 } 2062 2063 if (PrintCodeCacheOnCompilation) 2064 codecache_print(/* detailed= */ false); 2065 2066 // Disable compilation, if required. 2067 switch (compilable) { 2068 case ciEnv::MethodCompilable_never: 2069 if (is_osr) 2070 method->set_not_osr_compilable_quietly(); 2071 else 2072 method->set_not_compilable_quietly(); 2073 break; 2074 case ciEnv::MethodCompilable_not_at_tier: 2075 if (is_osr) 2076 method->set_not_osr_compilable_quietly(task_level); 2077 else 2078 method->set_not_compilable_quietly(task_level); 2079 break; 2080 } 2081 2082 // Note that the queued_for_compilation bits are cleared without 2083 // protection of a mutex. [They were set by the requester thread, 2084 // when adding the task to the compile queue -- at which time the 2085 // compile queue lock was held. Subsequently, we acquired the compile 2086 // queue lock to get this task off the compile queue; thus (to belabour 2087 // the point somewhat) our clearing of the bits must be occurring 2088 // only after the setting of the bits. See also 14012000 above. 2089 method->clear_queued_for_compilation(); 2090 2091 #ifdef ASSERT 2092 if (CollectedHeap::fired_fake_oom()) { 2093 // The current compile received a fake OOM during compilation so 2094 // go ahead and exit the VM since the test apparently succeeded 2095 tty->print_cr("*** Shutting down VM after successful fake OOM"); 2096 vm_exit(0); 2097 } 2098 #endif 2099 } 2100 2101 /** 2102 * The CodeCache is full. Print out warning and disable compilation 2103 * or try code cache cleaning so compilation can continue later. 2104 */ 2105 void CompileBroker::handle_full_code_cache() { 2106 UseInterpreter = true; 2107 if (UseCompiler || AlwaysCompileLoopMethods ) { 2108 if (xtty != NULL) { 2109 ResourceMark rm; 2110 stringStream s; 2111 // Dump code cache state into a buffer before locking the tty, 2112 // because log_state() will use locks causing lock conflicts. 2113 CodeCache::log_state(&s); 2114 // Lock to prevent tearing 2115 ttyLocker ttyl; 2116 xtty->begin_elem("code_cache_full"); 2117 xtty->print("%s", s.as_string()); 2118 xtty->stamp(); 2119 xtty->end_elem(); 2120 } 2121 2122 CodeCache::report_codemem_full(); 2123 2124 #ifndef PRODUCT 2125 if (CompileTheWorld || ExitOnFullCodeCache) { 2126 codecache_print(/* detailed= */ true); 2127 before_exit(JavaThread::current()); 2128 exit_globals(); // will delete tty 2129 vm_direct_exit(CompileTheWorld ? 0 : 1); 2130 } 2131 #endif 2132 if (UseCodeCacheFlushing) { 2133 // Since code cache is full, immediately stop new compiles 2134 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2135 NMethodSweeper::log_sweep("disable_compiler"); 2136 } 2137 // Switch to 'vm_state'. This ensures that possibly_sweep() can be called 2138 // without having to consider the state in which the current thread is. 2139 ThreadInVMfromUnknown in_vm; 2140 NMethodSweeper::possibly_sweep(); 2141 } else { 2142 disable_compilation_forever(); 2143 } 2144 2145 // Print warning only once 2146 if (should_print_compiler_warning()) { 2147 warning("CodeCache is full. Compiler has been disabled."); 2148 warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize="); 2149 codecache_print(/* detailed= */ true); 2150 } 2151 } 2152 } 2153 2154 // ------------------------------------------------------------------ 2155 // CompileBroker::set_last_compile 2156 // 2157 // Record this compilation for debugging purposes. 2158 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) { 2159 ResourceMark rm; 2160 char* method_name = method->name()->as_C_string(); 2161 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2162 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2163 char current_method[CompilerCounters::cmname_buffer_length]; 2164 size_t maxLen = CompilerCounters::cmname_buffer_length; 2165 2166 if (UsePerfData) { 2167 const char* class_name = method->method_holder()->name()->as_C_string(); 2168 2169 size_t s1len = strlen(class_name); 2170 size_t s2len = strlen(method_name); 2171 2172 // check if we need to truncate the string 2173 if (s1len + s2len + 2 > maxLen) { 2174 2175 // the strategy is to lop off the leading characters of the 2176 // class name and the trailing characters of the method name. 2177 2178 if (s2len + 2 > maxLen) { 2179 // lop of the entire class name string, let snprintf handle 2180 // truncation of the method name. 2181 class_name += s1len; // null string 2182 } 2183 else { 2184 // lop off the extra characters from the front of the class name 2185 class_name += ((s1len + s2len + 2) - maxLen); 2186 } 2187 } 2188 2189 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2190 } 2191 2192 if (CICountOSR && is_osr) { 2193 _last_compile_type = osr_compile; 2194 } else { 2195 _last_compile_type = normal_compile; 2196 } 2197 _last_compile_level = comp_level; 2198 2199 if (UsePerfData) { 2200 CompilerCounters* counters = thread->counters(); 2201 counters->set_current_method(current_method); 2202 counters->set_compile_type((jlong)_last_compile_type); 2203 } 2204 } 2205 2206 2207 // ------------------------------------------------------------------ 2208 // CompileBroker::push_jni_handle_block 2209 // 2210 // Push on a new block of JNI handles. 2211 void CompileBroker::push_jni_handle_block() { 2212 JavaThread* thread = JavaThread::current(); 2213 2214 // Allocate a new block for JNI handles. 2215 // Inlined code from jni_PushLocalFrame() 2216 JNIHandleBlock* java_handles = thread->active_handles(); 2217 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2218 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2219 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2220 thread->set_active_handles(compile_handles); 2221 } 2222 2223 2224 // ------------------------------------------------------------------ 2225 // CompileBroker::pop_jni_handle_block 2226 // 2227 // Pop off the current block of JNI handles. 2228 void CompileBroker::pop_jni_handle_block() { 2229 JavaThread* thread = JavaThread::current(); 2230 2231 // Release our JNI handle block 2232 JNIHandleBlock* compile_handles = thread->active_handles(); 2233 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2234 thread->set_active_handles(java_handles); 2235 compile_handles->set_pop_frame_link(NULL); 2236 JNIHandleBlock::release_block(compile_handles, thread); // may block 2237 } 2238 2239 2240 // ------------------------------------------------------------------ 2241 // CompileBroker::check_break_at 2242 // 2243 // Should the compilation break at the current compilation. 2244 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2245 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2246 return true; 2247 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2248 return true; 2249 } else { 2250 return (compile_id == CIBreakAt); 2251 } 2252 } 2253 2254 // ------------------------------------------------------------------ 2255 // CompileBroker::collect_statistics 2256 // 2257 // Collect statistics about the compilation. 2258 2259 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2260 bool success = task->is_success(); 2261 methodHandle method (thread, task->method()); 2262 uint compile_id = task->compile_id(); 2263 bool is_osr = (task->osr_bci() != standard_entry_bci); 2264 nmethod* code = task->code(); 2265 CompilerCounters* counters = thread->counters(); 2266 2267 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2268 MutexLocker locker(CompileStatistics_lock); 2269 2270 // _perf variables are production performance counters which are 2271 // updated regardless of the setting of the CITime and CITimeEach flags 2272 // 2273 if (!success) { 2274 _total_bailout_count++; 2275 if (UsePerfData) { 2276 _perf_last_failed_method->set_value(counters->current_method()); 2277 _perf_last_failed_type->set_value(counters->compile_type()); 2278 _perf_total_bailout_count->inc(); 2279 } 2280 } else if (code == NULL) { 2281 if (UsePerfData) { 2282 _perf_last_invalidated_method->set_value(counters->current_method()); 2283 _perf_last_invalidated_type->set_value(counters->compile_type()); 2284 _perf_total_invalidated_count->inc(); 2285 } 2286 _total_invalidated_count++; 2287 } else { 2288 // Compilation succeeded 2289 2290 // update compilation ticks - used by the implementation of 2291 // java.lang.management.CompilationMBean 2292 _perf_total_compilation->inc(time.ticks()); 2293 2294 _t_total_compilation.add(time); 2295 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2296 2297 if (CITime) { 2298 if (is_osr) { 2299 _t_osr_compilation.add(time); 2300 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2301 } else { 2302 _t_standard_compilation.add(time); 2303 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2304 } 2305 } 2306 2307 if (UsePerfData) { 2308 // save the name of the last method compiled 2309 _perf_last_method->set_value(counters->current_method()); 2310 _perf_last_compile_type->set_value(counters->compile_type()); 2311 _perf_last_compile_size->set_value(method->code_size() + 2312 task->num_inlined_bytecodes()); 2313 if (is_osr) { 2314 _perf_osr_compilation->inc(time.ticks()); 2315 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2316 } else { 2317 _perf_standard_compilation->inc(time.ticks()); 2318 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2319 } 2320 } 2321 2322 if (CITimeEach) { 2323 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2324 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2325 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2326 } 2327 2328 // Collect counts of successful compilations 2329 _sum_nmethod_size += code->total_size(); 2330 _sum_nmethod_code_size += code->insts_size(); 2331 _total_compile_count++; 2332 2333 if (UsePerfData) { 2334 _perf_sum_nmethod_size->inc( code->total_size()); 2335 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2336 _perf_total_compile_count->inc(); 2337 } 2338 2339 if (is_osr) { 2340 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2341 _total_osr_compile_count++; 2342 } else { 2343 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2344 _total_standard_compile_count++; 2345 } 2346 } 2347 // set the current method for the thread to null 2348 if (UsePerfData) counters->set_current_method(""); 2349 } 2350 2351 const char* CompileBroker::compiler_name(int comp_level) { 2352 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2353 if (comp == NULL) { 2354 return "no compiler"; 2355 } else { 2356 return (comp->name()); 2357 } 2358 } 2359 2360 void CompileBroker::print_times() { 2361 tty->cr(); 2362 tty->print_cr("Accumulated compiler times (for compiled methods only)"); 2363 tty->print_cr("------------------------------------------------"); 2364 //0000000000111111111122222222223333333333444444444455555555556666666666 2365 //0123456789012345678901234567890123456789012345678901234567890123456789 2366 tty->print_cr(" Total compilation time : %6.3f s", CompileBroker::_t_total_compilation.seconds()); 2367 tty->print_cr(" Standard compilation : %6.3f s, Average : %2.3f", 2368 CompileBroker::_t_standard_compilation.seconds(), 2369 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2370 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); 2371 2372 AbstractCompiler *comp = compiler(CompLevel_simple); 2373 if (comp != NULL) { 2374 comp->print_timers(); 2375 } 2376 comp = compiler(CompLevel_full_optimization); 2377 if (comp != NULL) { 2378 comp->print_timers(); 2379 } 2380 tty->cr(); 2381 tty->print_cr(" Total compiled methods : %6d methods", CompileBroker::_total_compile_count); 2382 tty->print_cr(" Standard compilation : %6d methods", CompileBroker::_total_standard_compile_count); 2383 tty->print_cr(" On stack replacement : %6d methods", CompileBroker::_total_osr_compile_count); 2384 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2385 tty->print_cr(" Total compiled bytecodes : %6d bytes", tcb); 2386 tty->print_cr(" Standard compilation : %6d bytes", CompileBroker::_sum_standard_bytes_compiled); 2387 tty->print_cr(" On stack replacement : %6d bytes", CompileBroker::_sum_osr_bytes_compiled); 2388 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2389 tty->print_cr(" Average compilation speed: %6d bytes/s", bps); 2390 tty->cr(); 2391 tty->print_cr(" nmethod code size : %6d bytes", CompileBroker::_sum_nmethod_code_size); 2392 tty->print_cr(" nmethod total size : %6d bytes", CompileBroker::_sum_nmethod_size); 2393 } 2394 2395 // Debugging output for failure 2396 void CompileBroker::print_last_compile() { 2397 if ( _last_compile_level != CompLevel_none && 2398 compiler(_last_compile_level) != NULL && 2399 _last_method_compiled != NULL && 2400 _last_compile_type != no_compile) { 2401 if (_last_compile_type == osr_compile) { 2402 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2403 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2404 } else { 2405 tty->print_cr("Last parse: %d+++(%d) %s", 2406 _compilation_id, _last_compile_level, _last_method_compiled); 2407 } 2408 } 2409 } 2410 2411 2412 void CompileBroker::print_compiler_threads_on(outputStream* st) { 2413 #ifndef PRODUCT 2414 st->print_cr("Compiler thread printing unimplemented."); 2415 st->cr(); 2416 #endif 2417 }