Old src/share/vm/compiler/compileBroker.cpp (original) (raw)

1 /* 2 * Copyright (c) 1999, 2015, 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 "prims/whitebox.hpp" 39 #include "runtime/arguments.hpp" 40 #include "runtime/atomic.inline.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/init.hpp" 43 #include "runtime/interfaceSupport.hpp" 44 #include "runtime/javaCalls.hpp" 45 #include "runtime/os.hpp" 46 #include "runtime/sharedRuntime.hpp" 47 #include "runtime/sweeper.hpp" 48 #include "trace/tracing.hpp" 49 #include "utilities/dtrace.hpp" 50 #include "utilities/events.hpp" 51 #ifdef COMPILER1 52 #include "c1/c1_Compiler.hpp" 53 #endif 54 #ifdef COMPILER2 55 #include "opto/c2compiler.hpp" 56 #endif 57 #ifdef SHARK 58 #include "shark/sharkCompiler.hpp" 59 #endif 60 61 #ifdef DTRACE_ENABLED 62 63 // Only bother with this argument setup if dtrace is available 64 65 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
66 {
67 Symbol
klass_name = (method)->klass_name();
68 Symbol* name = (method)->name();
69 Symbol* signature = (method)->signature();
70 HOTSPOT_METHOD_COMPILE_BEGIN(
71 (char ) comp_name, strlen(comp_name),
72 (char ) klass_name->bytes(), klass_name->utf8_length(),
73 (char ) name->bytes(), name->utf8_length(),
74 (char ) signature->bytes(), signature->utf8_length());
75 } 76 77 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
78 {
79 Symbol
klass_name = (method)->klass_name();
80 Symbol
name = (method)->name();
81 Symbol
signature = (method)->signature();
82 HOTSPOT_METHOD_COMPILE_END(
83 (char ) comp_name, strlen(comp_name),
84 (char ) klass_name->bytes(), klass_name->utf8_length(),
85 (char ) name->bytes(), name->utf8_length(),
86 (char ) signature->bytes(), signature->utf8_length(), (success));
87 } 88 89 #else // ndef DTRACE_ENABLED 90 91 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) 92 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) 93 94 #endif // ndef DTRACE_ENABLED 95 96 bool CompileBroker::_initialized = false; 97 volatile bool CompileBroker::_should_block = false; 98 volatile jint CompileBroker::_print_compilation_warning = 0; 99 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation; 100 101 // The installed compiler(s) 102 AbstractCompiler
CompileBroker::_compilers[2]; 103 104 // These counters are used to assign an unique ID to each compilation. 105 volatile jint CompileBroker::_compilation_id = 0; 106 volatile jint CompileBroker::_osr_compilation_id = 0; 107 108 // Debugging information 109 int CompileBroker::_last_compile_type = no_compile; 110 int CompileBroker::_last_compile_level = CompLevel_none; 111 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length]; 112 113 // Performance counters 114 PerfCounter
CompileBroker::_perf_total_compilation = NULL; 115 PerfCounter
CompileBroker::_perf_osr_compilation = NULL; 116 PerfCounter
CompileBroker::_perf_standard_compilation = NULL; 117 118 PerfCounter
CompileBroker::_perf_total_bailout_count = NULL; 119 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL; 120 PerfCounter* CompileBroker::_perf_total_compile_count = NULL; 121 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL; 122 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL; 123 124 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL; 125 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL; 126 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL; 127 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL; 128 129 PerfStringVariable* CompileBroker::_perf_last_method = NULL; 130 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL; 131 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL; 132 PerfVariable* CompileBroker::_perf_last_compile_type = NULL; 133 PerfVariable* CompileBroker::_perf_last_compile_size = NULL; 134 PerfVariable* CompileBroker::_perf_last_failed_type = NULL; 135 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL; 136 137 // Timers and counters for generating statistics 138 elapsedTimer CompileBroker::_t_total_compilation; 139 elapsedTimer CompileBroker::_t_osr_compilation; 140 elapsedTimer CompileBroker::_t_standard_compilation; 141 elapsedTimer CompileBroker::_t_invalidated_compilation; 142 elapsedTimer CompileBroker::_t_bailedout_compilation; 143 144 int CompileBroker::_total_bailout_count = 0; 145 int CompileBroker::_total_invalidated_count = 0; 146 int CompileBroker::_total_compile_count = 0; 147 int CompileBroker::_total_osr_compile_count = 0; 148 int CompileBroker::_total_standard_compile_count = 0; 149 150 int CompileBroker::_sum_osr_bytes_compiled = 0; 151 int CompileBroker::_sum_standard_bytes_compiled = 0; 152 int CompileBroker::_sum_nmethod_size = 0; 153 int CompileBroker::_sum_nmethod_code_size = 0; 154 155 long CompileBroker::_peak_compilation_time = 0; 156 157 CompileQueue* CompileBroker::_c2_compile_queue = NULL; 158 CompileQueue* CompileBroker::_c1_compile_queue = NULL; 159 160 161 class CompilationLog : public StringEventLog { 162 public: 163 CompilationLog() : StringEventLog("Compilation events") { 164 } 165 166 void log_compile(JavaThread* thread, CompileTask* task) { 167 StringLogMessage lm; 168 stringStream sstr = lm.stream(); 169 // msg.time_stamp().update_to(tty->time_stamp().ticks()); 170 task->print_compilation(&sstr, NULL, true, false); 171 log(thread, "%s", (const char*)lm); 172 } 173 174 void log_nmethod(JavaThread* thread, nmethod* nm) { 175 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", 176 nm->compile_id(), nm->is_osr_method() ? "%" : "", 177 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end())); 178 } 179 180 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) { 181 StringLogMessage lm; 182 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason); 183 if (retry_message != NULL) { 184 lm.append(" (%s)", retry_message); 185 } 186 lm.print("\n"); 187 log(thread, "%s", (const char*)lm); 188 } 189 190 void log_metaspace_failure(const char* reason) { 191 ResourceMark rm; 192 StringLogMessage lm; 193 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason); 194 lm.print("\n"); 195 log(JavaThread::current(), "%s", (const char*)lm); 196 } 197 }; 198 199 static CompilationLog* _compilation_log = NULL; 200 201 void compileBroker_init() { 202 if (LogEvents) { 203 _compilation_log = new CompilationLog(); 204 } 205 } 206 207 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) { 208 CompilerThread* thread = CompilerThread::current(); 209 thread->set_task(task); 210 CompileLog* log = thread->log(); 211 if (log != NULL) task->log_task_start(log); 212 } 213 214 CompileTaskWrapper::~CompileTaskWrapper() { 215 CompilerThread* thread = CompilerThread::current(); 216 CompileTask* task = thread->task(); 217 CompileLog* log = thread->log(); 218 if (log != NULL) task->log_task_done(log); 219 thread->set_task(NULL); 220 task->set_code_handle(NULL); 221 thread->set_env(NULL); 222 if (task->is_blocking()) { 223 MutexLocker notifier(task->lock(), thread); 224 task->mark_complete(); 225 // Notify the waiting thread that the compilation has completed. 226 task->lock()->notify_all(); 227 } else { 228 task->mark_complete(); 229 230 // By convention, the compiling thread is responsible for 231 // recycling a non-blocking CompileTask. 232 CompileTask::free(task); 233 } 234 } 235 236 237 CompileTask* CompileTask::_task_free_list = NULL; 238 #ifdef ASSERT 239 int CompileTask::_num_allocated_tasks = 0; 240 #endif 241 /** 242 * Allocate a CompileTask, from the free list if possible. 243 / 244 CompileTask CompileTask::allocate() { 245 MutexLocker locker(CompileTaskAlloc_lock); 246 CompileTask* task = NULL; 247 248 if (_task_free_list != NULL) { 249 task = _task_free_list; 250 _task_free_list = task->next(); 251 task->set_next(NULL); 252 } else { 253 task = new CompileTask(); 254 DEBUG_ONLY(_num_allocated_tasks++;) 255 assert (WhiteBoxAPI || _num_allocated_tasks < 10000, "Leaking compilation tasks?"); 256 task->set_next(NULL); 257 task->set_is_free(true); 258 } 259 assert(task->is_free(), "Task must be free."); 260 task->set_is_free(false); 261 return task; 262 } 263 264 265 /** 266 * Add a task to the free list. 267 / 268 void CompileTask::free(CompileTask task) { 269 MutexLocker locker(CompileTaskAlloc_lock); 270 if (!task->is_free()) { 271 task->set_code(NULL); 272 assert(!task->lock()->is_locked(), "Should not be locked when freed"); 273 JNIHandles::destroy_global(task->_method_holder); 274 JNIHandles::destroy_global(task->_hot_method_holder); 275 276 task->set_is_free(true); 277 task->set_next(_task_free_list); 278 _task_free_list = task; 279 } 280 } 281 282 void CompileTask::initialize(int compile_id, 283 methodHandle method, 284 int osr_bci, 285 int comp_level, 286 methodHandle hot_method, 287 int hot_count, 288 const char* comment, 289 bool is_blocking) { 290 assert(!_lock->is_locked(), "bad locking"); 291 292 _compile_id = compile_id; 293 _method = method(); 294 _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder()); 295 _osr_bci = osr_bci; 296 _is_blocking = is_blocking; 297 _comp_level = comp_level; 298 _num_inlined_bytecodes = 0; 299 300 _is_complete = false; 301 _is_success = false; 302 _code_handle = NULL; 303 304 _hot_method = NULL; 305 _hot_method_holder = NULL; 306 _hot_count = hot_count; 307 _time_queued = 0; // tidy 308 _comment = comment; 309 _failure_reason = NULL; 310 311 if (LogCompilation) { 312 _time_queued = os::elapsed_counter(); 313 if (hot_method.not_null()) { 314 if (hot_method == method) { 315 _hot_method = _method; 316 } else { 317 _hot_method = hot_method(); 318 // only add loader or mirror if different from _method_holder 319 _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder()); 320 } 321 } 322 } 323 324 _next = NULL; 325 } 326 327 // ------------------------------------------------------------------ 328 // CompileTask::code/set_code 329 nmethod* CompileTask::code() const { 330 if (_code_handle == NULL) return NULL; 331 return _code_handle->code(); 332 } 333 void CompileTask::set_code(nmethod* nm) { 334 if (_code_handle == NULL && nm == NULL) return; 335 guarantee(_code_handle != NULL, ""); 336 _code_handle->set_code(nm); 337 if (nm == NULL) _code_handle = NULL; // drop the handle also 338 } 339 340 void CompileTask::mark_on_stack() { 341 // Mark these methods as something redefine classes cannot remove. 342 _method->set_on_stack(true); 343 if (_hot_method != NULL) { 344 _hot_method->set_on_stack(true); 345 } 346 } 347 348 // RedefineClasses support 349 void CompileTask::metadata_do(void f(Metadata*)) { 350 f(method()); 351 if (hot_method() != NULL && hot_method() != method()) { 352 f(hot_method()); 353 } 354 } 355 356 // ------------------------------------------------------------------ 357 // CompileTask::print_line_on_error 358 // 359 // This function is called by fatal error handler when the thread 360 // causing troubles is a compiler thread. 361 // 362 // Do not grab any lock, do not allocate memory. 363 // 364 // Otherwise it's the same as CompileTask::print_line() 365 // 366 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) { 367 // print compiler name 368 st->print("%s:", CompileBroker::compiler_name(comp_level())); 369 print_compilation(st); 370 } 371 372 // ------------------------------------------------------------------ 373 // CompileTask::print_line 374 void CompileTask::print_tty() { 375 ttyLocker ttyl; // keep the following output all in one block 376 // print compiler name if requested 377 if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level())); 378 print_compilation(tty); 379 } 380 381 // ------------------------------------------------------------------ 382 // CompileTask::print_compilation_impl 383 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level, 384 bool is_osr_method, int osr_bci, bool is_blocking, 385 const char* msg, bool short_form, bool cr) { 386 if (!short_form) { 387 st->print("%7d ", (int) st->time_stamp().milliseconds()); // print timestamp 388 } 389 st->print("%4d ", compile_id); // print compilation number 390 391 // For unloaded methods the transition to zombie occurs after the 392 // method is cleared so it's impossible to report accurate 393 // information for that case. 394 bool is_synchronized = false; 395 bool has_exception_handler = false; 396 bool is_native = false; 397 if (method != NULL) { 398 is_synchronized = method->is_synchronized(); 399 has_exception_handler = method->has_exception_handler(); 400 is_native = method->is_native(); 401 } 402 // method attributes 403 const char compile_type = is_osr_method ? '%' : ' '; 404 const char sync_char = is_synchronized ? 's' : ' '; 405 const char exception_char = has_exception_handler ? '!' : ' '; 406 const char blocking_char = is_blocking ? 'b' : ' '; 407 const char native_char = is_native ? 'n' : ' '; 408 409 // print method attributes 410 st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char); 411 412 if (TieredCompilation) { 413 if (comp_level != -1) st->print("%d ", comp_level); 414 else st->print("- "); 415 } 416 st->print(" "); // more indent 417 418 if (method == NULL) { 419 st->print("(method)"); 420 } else { 421 method->print_short_name(st); 422 if (is_osr_method) { 423 st->print(" @ %d", osr_bci); 424 } 425 if (method->is_native()) 426 st->print(" (native)"); 427 else 428 st->print(" (%d bytes)", method->code_size()); 429 } 430 431 if (msg != NULL) { 432 st->print(" %s", msg); 433 } 434 if (cr) { 435 st->cr(); 436 } 437 } 438 439 // ------------------------------------------------------------------ 440 // CompileTask::print_inlining 441 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) { 442 // 1234567 443 st->print(" "); // print timestamp 444 // 1234 445 st->print(" "); // print compilation number 446 447 // method attributes 448 if (method->is_loaded()) { 449 const char sync_char = method->is_synchronized() ? 's' : ' '; 450 const char exception_char = method->has_exception_handlers() ? '!' : ' '; 451 const char monitors_char = method->has_monitor_bytecodes() ? 'm' : ' '; 452 453 // print method attributes 454 st->print(" %c%c%c ", sync_char, exception_char, monitors_char); 455 } else { 456 // %s!bn 457 st->print(" "); // print method attributes 458 } 459 460 if (TieredCompilation) { 461 st->print(" "); 462 } 463 st->print(" "); // more indent 464 st->print(" "); // initial inlining indent 465 466 for (int i = 0; i < inline_level; i++) st->print(" "); 467 468 st->print("@ %d ", bci); // print bci 469 method->print_short_name(st); 470 if (method->is_loaded()) 471 st->print(" (%d bytes)", method->code_size()); 472 else 473 st->print(" (not loaded)"); 474 475 if (msg != NULL) { 476 st->print(" %s", msg); 477 } 478 st->cr(); 479 } 480 481 // ------------------------------------------------------------------ 482 // CompileTask::print_inline_indent 483 void CompileTask::print_inline_indent(int inline_level, outputStream* st) { 484 // 1234567 485 st->print(" "); // print timestamp 486 // 1234 487 st->print(" "); // print compilation number 488 // %s!bn 489 st->print(" "); // print method attributes 490 if (TieredCompilation) { 491 st->print(" "); 492 } 493 st->print(" "); // more indent 494 st->print(" "); // initial inlining indent 495 for (int i = 0; i < inline_level; i++) st->print(" "); 496 } 497 498 // ------------------------------------------------------------------ 499 // CompileTask::print_compilation 500 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) { 501 bool is_osr_method = osr_bci() != InvocationEntryBci; 502 print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr); 503 } 504 505 // ------------------------------------------------------------------ 506 // CompileTask::log_task 507 void CompileTask::log_task(xmlStream* log) { 508 Thread* thread = Thread::current(); 509 methodHandle method(thread, this->method()); 510 ResourceMark rm(thread); 511 512 // 513 log->print(" compiler='%s' compile_id='%d'", _comp_level <= CompLevel_full_profile ? "C1" : "C2", _compile_id); 514 if (_osr_bci != CompileBroker::standard_entry_bci) { 515 log->print(" compile_kind='osr'"); // same as nmethod::compile_kind 516 } // else compile_kind='c2c' 517 if (!method.is_null()) log->method(method); 518 if (_osr_bci != CompileBroker::standard_entry_bci) { 519 log->print(" osr_bci='%d'", _osr_bci); 520 } 521 if (_comp_level != CompLevel_highest_tier) { 522 log->print(" level='%d'", _comp_level); 523 } 524 if (_is_blocking) { 525 log->print(" blocking='1'"); 526 } 527 log->stamp(); 528 } 529 530 531 // ------------------------------------------------------------------ 532 // CompileTask::log_task_queued 533 void CompileTask::log_task_queued() { 534 Thread* thread = Thread::current(); 535 ttyLocker ttyl; 536 ResourceMark rm(thread); 537 538 xtty->begin_elem("task_queued"); 539 log_task(xtty); 540 if (_comment != NULL) { 541 xtty->print(" comment='%s'", _comment); 542 } 543 if (_hot_method != NULL) { 544 methodHandle hot(thread, _hot_method); 545 methodHandle method(thread, _method); 546 if (hot() != method()) { 547 xtty->method(hot); 548 } 549 } 550 if (_hot_count != 0) { 551 xtty->print(" hot_count='%d'", _hot_count); 552 } 553 xtty->end_elem(); 554 } 555 556 557 // ------------------------------------------------------------------ 558 // CompileTask::log_task_start 559 void CompileTask::log_task_start(CompileLog* log) { 560 log->begin_head("task"); 561 log_task(log); 562 log->end_head(); 563 } 564 565 566 // ------------------------------------------------------------------ 567 // CompileTask::log_task_done 568 void CompileTask::log_task_done(CompileLog* log) { 569 Thread* thread = Thread::current(); 570 methodHandle method(thread, this->method()); 571 ResourceMark rm(thread); 572 573 if (!_is_success) { 574 const char* reason = _failure_reason != NULL ? _failure_reason : "unknown"; 575 log->elem("failure reason='%s'", reason); 576 } 577 578 // <task_done ... stamp='1.234'> 579 nmethod* nm = code(); 580 log->begin_elem("task_done success='%d' nmsize='%d' count='%d'", 581 _is_success, nm == NULL ? 0 : nm->content_size(), 582 method->invocation_count()); 583 int bec = method->backedge_count(); 584 if (bec != 0) log->print(" backedge_count='%d'", bec); 585 // Note: "_is_complete" is about to be set, but is not. 586 if (_num_inlined_bytecodes != 0) { 587 log->print(" inlined_bytes='%d'", _num_inlined_bytecodes); 588 } 589 log->stamp(); 590 log->end_elem(); 591 log->tail("task"); 592 log->clear_identities(); // next task will have different CI 593 if (log->unflushed_count() > 2000) { 594 log->flush(); 595 } 596 log->mark_file_end(); 597 } 598 599 600 601 /** 602 * Add a CompileTask to a CompileQueue. 603 / 604 void CompileQueue::add(CompileTask task) { 605 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 606 607 task->set_next(NULL); 608 task->set_prev(NULL); 609 610 if (_last == NULL) { 611 // The compile queue is empty. 612 assert(_first == NULL, "queue is empty"); 613 _first = task; 614 _last = task; 615 } else { 616 // Append the task to the queue. 617 assert(_last->next() == NULL, "not last"); 618 _last->set_next(task); 619 task->set_prev(_last); 620 _last = task; 621 } 622 ++_size; 623 624 // Mark the method as being in the compile queue. 625 task->method()->set_queued_for_compilation(); 626 627 if (CIPrintCompileQueue) { 628 print_tty(); 629 } 630 631 if (LogCompilation && xtty != NULL) { 632 task->log_task_queued(); 633 } 634 635 // Notify CompilerThreads that a task is available. 636 MethodCompileQueue_lock->notify_all(); 637 } 638 639 /** 640 * Empties compilation queue by putting all compilation tasks onto 641 * a freelist. Furthermore, the method wakes up all threads that are 642 * waiting on a compilation task to finish. This can happen if background 643 * compilation is disabled. 644 / 645 void CompileQueue::free_all() { 646 MutexLocker mu(MethodCompileQueue_lock); 647 CompileTask next = _first; 648 649 // Iterate over all tasks in the compile queue 650 while (next != NULL) { 651 CompileTask* current = next; 652 next = current->next(); 653 { 654 // Wake up thread that blocks on the compile task. 655 MutexLocker ct_lock(current->lock()); 656 current->lock()->notify(); 657 } 658 // Put the task back on the freelist. 659 CompileTask::free(current); 660 } 661 _first = NULL; 662 663 // Wake up all threads that block on the queue. 664 MethodCompileQueue_lock->notify_all(); 665 } 666 667 /** 668 * Get the next CompileTask from a CompileQueue 669 / 670 CompileTask CompileQueue::get() { 671 // save methods from RedefineClasses across safepoint 672 // across MethodCompileQueue_lock below. 673 methodHandle save_method; 674 methodHandle save_hot_method; 675 676 MutexLocker locker(MethodCompileQueue_lock); 677 // If _first is NULL we have no more compile jobs. There are two reasons for 678 // having no compile jobs: First, we compiled everything we wanted. Second, 679 // we ran out of code cache so compilation has been disabled. In the latter 680 // case we perform code cache sweeps to free memory such that we can re-enable 681 // compilation. 682 while (_first == NULL) { 683 // Exit loop if compilation is disabled forever 684 if (CompileBroker::is_compilation_disabled_forever()) { 685 return NULL; 686 } 687 688 // If there are no compilation tasks and we can compile new jobs 689 // (i.e., there is enough free space in the code cache) there is 690 // no need to invoke the sweeper. As a result, the hotness of methods 691 // remains unchanged. This behavior is desired, since we want to keep 692 // the stable state, i.e., we do not want to evict methods from the 693 // code cache if it is unnecessary. 694 // We need a timed wait here, since compiler threads can exit if compilation 695 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads 696 // is not critical and we do not want idle compiler threads to wake up too often. 697 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 51000); 698 } 699 700 if (CompileBroker::is_compilation_disabled_forever()) { 701 return NULL; 702 } 703 704 CompileTask task; 705 { 706 No_Safepoint_Verifier nsv; 707 task = CompilationPolicy::policy()->select_task(this); 708 } 709 710 // Save method pointers across unlock safepoint. The task is removed from 711 // the compilation queue, which is walked during RedefineClasses. 712 save_method = methodHandle(task->method()); 713 save_hot_method = methodHandle(task->hot_method()); 714 715 remove(task); 716 purge_stale_tasks(); // may temporarily release MCQ lock 717 return task; 718 } 719 720 // Clean & deallocate stale compile tasks. 721 // Temporarily releases MethodCompileQueue lock. 722 void CompileQueue::purge_stale_tasks() { 723 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 724 if (_first_stale != NULL) { 725 // Stale tasks are purged when MCQ lock is released, 726 // but _first_stale updates are protected by MCQ lock. 727 // Once task processing starts and MCQ lock is released, 728 // other compiler threads can reuse _first_stale. 729 CompileTask* head = _first_stale; 730 _first_stale = NULL; 731 { 732 MutexUnlocker ul(MethodCompileQueue_lock); 733 for (CompileTask* task = head; task != NULL; ) { 734 CompileTask* next_task = task->next(); 735 CompileTaskWrapper ctw(task); // Frees the task 736 task->set_failure_reason("stale task"); 737 task = next_task; 738 } 739 } 740 } 741 } 742 743 void CompileQueue::remove(CompileTask* task) { 744 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 745 if (task->prev() != NULL) { 746 task->prev()->set_next(task->next()); 747 } else { 748 // max is the first element 749 assert(task == _first, "Sanity"); 750 _first = task->next(); 751 } 752 753 if (task->next() != NULL) { 754 task->next()->set_prev(task->prev()); 755 } else { 756 // max is the last element 757 assert(task == _last, "Sanity"); 758 _last = task->prev(); 759 } 760 --_size; 761 } 762 763 void CompileQueue::remove_and_mark_stale(CompileTask* task) { 764 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 765 remove(task); 766 767 // Enqueue the task for reclamation (should be done outside MCQ lock) 768 task->set_next(_first_stale); 769 task->set_prev(NULL); 770 _first_stale = task; 771 } 772 773 // methods in the compile queue need to be marked as used on the stack 774 // so that they don't get reclaimed by Redefine Classes 775 void CompileQueue::mark_on_stack() { 776 CompileTask* task = _first; 777 while (task != NULL) { 778 task->mark_on_stack(); 779 task = task->next(); 780 } 781 } 782 783 784 CompileQueue* CompileBroker::compile_queue(int comp_level) { 785 if (is_c2_compile(comp_level)) return _c2_compile_queue; 786 if (is_c1_compile(comp_level)) return _c1_compile_queue; 787 return NULL; 788 } 789 790 791 void CompileBroker::print_compile_queues(outputStream* st) { 792 MutexLocker locker(MethodCompileQueue_lock); 793 if (_c1_compile_queue != NULL) { 794 _c1_compile_queue->print(st); 795 } 796 if (_c2_compile_queue != NULL) { 797 _c2_compile_queue->print(st); 798 } 799 } 800 801 void CompileQueue::print(outputStream* st) { 802 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock"); 803 st->print_cr("Contents of %s", name()); 804 st->print_cr("----------------------------"); 805 CompileTask* task = _first; 806 if (task == NULL) { 807 st->print_cr("Empty"); 808 } else { 809 while (task != NULL) { 810 task->print_compilation(st, NULL, true, true); 811 task = task->next(); 812 } 813 } 814 st->print_cr("----------------------------"); 815 } 816 817 void CompileQueue::print_tty() { 818 ttyLocker ttyl; 819 print(tty); 820 } 821 822 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) { 823 824 _current_method[0] = '\0'; 825 _compile_type = CompileBroker::no_compile; 826 827 if (UsePerfData) { 828 ResourceMark rm; 829 830 // create the thread instance name space string - don't create an 831 // instance subspace if instance is -1 - keeps the adapterThread 832 // counters from having a ".0" namespace. 833 const char* thread_i = (instance == -1) ? thread_name : 834 PerfDataManager::name_space(thread_name, instance); 835 836 837 char* name = PerfDataManager::counter_name(thread_i, "method"); 838 _perf_current_method = 839 PerfDataManager::create_string_variable(SUN_CI, name, 840 cmname_buffer_length, 841 _current_method, CHECK); 842 843 name = PerfDataManager::counter_name(thread_i, "type"); 844 _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name, 845 PerfData::U_None, 846 (jlong)_compile_type, 847 CHECK); 848 849 name = PerfDataManager::counter_name(thread_i, "time"); 850 _perf_time = PerfDataManager::create_counter(SUN_CI, name, 851 PerfData::U_Ticks, CHECK); 852 853 name = PerfDataManager::counter_name(thread_i, "compiles"); 854 _perf_compiles = PerfDataManager::create_counter(SUN_CI, name, 855 PerfData::U_Events, CHECK); 856 } 857 } 858 859 // ------------------------------------------------------------------ 860 // CompileBroker::compilation_init 861 // 862 // Initialize the Compilation object 863 void CompileBroker::compilation_init() { 864 _last_method_compiled[0] = '\0'; 865 866 // No need to initialize compilation system if we do not use it. 867 if (!UseCompiler) { 868 return; 869 } 870 #ifndef SHARK 871 // Set the interface to the current compiler(s). 872 int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple); 873 int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization); 874 #ifdef COMPILER1 875 if (c1_count > 0) { 876 _compilers[0] = new Compiler(); 877 } 878 #endif // COMPILER1 879 880 #ifdef COMPILER2 881 if (c2_count > 0) { 882 _compilers[1] = new C2Compiler(); 883 } 884 #endif // COMPILER2 885 886 #else // SHARK 887 int c1_count = 0; 888 int c2_count = 1; 889 890 _compilers[1] = new SharkCompiler(); 891 #endif // SHARK 892 893 // Start the compiler thread(s) and the sweeper thread 894 init_compiler_sweeper_threads(c1_count, c2_count); 895 // totalTime performance counter is always created as it is required 896 // by the implementation of java.lang.management.CompilationMBean. 897 { 898 EXCEPTION_MARK; 899 _perf_total_compilation = 900 PerfDataManager::create_counter(JAVA_CI, "totalTime", 901 PerfData::U_Ticks, CHECK); 902 } 903 904 905 if (UsePerfData) { 906 907 EXCEPTION_MARK; 908 909 // create the jvmstat performance counters 910 _perf_osr_compilation = 911 PerfDataManager::create_counter(SUN_CI, "osrTime", 912 PerfData::U_Ticks, CHECK); 913 914 _perf_standard_compilation = 915 PerfDataManager::create_counter(SUN_CI, "standardTime", 916 PerfData::U_Ticks, CHECK); 917 918 _perf_total_bailout_count = 919 PerfDataManager::create_counter(SUN_CI, "totalBailouts", 920 PerfData::U_Events, CHECK); 921 922 _perf_total_invalidated_count = 923 PerfDataManager::create_counter(SUN_CI, "totalInvalidates", 924 PerfData::U_Events, CHECK); 925 926 _perf_total_compile_count = 927 PerfDataManager::create_counter(SUN_CI, "totalCompiles", 928 PerfData::U_Events, CHECK); 929 _perf_total_osr_compile_count = 930 PerfDataManager::create_counter(SUN_CI, "osrCompiles", 931 PerfData::U_Events, CHECK); 932 933 _perf_total_standard_compile_count = 934 PerfDataManager::create_counter(SUN_CI, "standardCompiles", 935 PerfData::U_Events, CHECK); 936 937 _perf_sum_osr_bytes_compiled = 938 PerfDataManager::create_counter(SUN_CI, "osrBytes", 939 PerfData::U_Bytes, CHECK); 940 941 _perf_sum_standard_bytes_compiled = 942 PerfDataManager::create_counter(SUN_CI, "standardBytes", 943 PerfData::U_Bytes, CHECK); 944 945 _perf_sum_nmethod_size = 946 PerfDataManager::create_counter(SUN_CI, "nmethodSize", 947 PerfData::U_Bytes, CHECK); 948 949 _perf_sum_nmethod_code_size = 950 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize", 951 PerfData::U_Bytes, CHECK); 952 953 _perf_last_method = 954 PerfDataManager::create_string_variable(SUN_CI, "lastMethod", 955 CompilerCounters::cmname_buffer_length, 956 "", CHECK); 957 958 _perf_last_failed_method = 959 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod", 960 CompilerCounters::cmname_buffer_length, 961 "", CHECK); 962 963 _perf_last_invalidated_method = 964 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod", 965 CompilerCounters::cmname_buffer_length, 966 "", CHECK); 967 968 _perf_last_compile_type = 969 PerfDataManager::create_variable(SUN_CI, "lastType", 970 PerfData::U_None, 971 (jlong)CompileBroker::no_compile, 972 CHECK); 973 974 _perf_last_compile_size = 975 PerfDataManager::create_variable(SUN_CI, "lastSize", 976 PerfData::U_Bytes, 977 (jlong)CompileBroker::no_compile, 978 CHECK); 979 980 981 _perf_last_failed_type = 982 PerfDataManager::create_variable(SUN_CI, "lastFailedType", 983 PerfData::U_None, 984 (jlong)CompileBroker::no_compile, 985 CHECK); 986 987 _perf_last_invalidated_type = 988 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType", 989 PerfData::U_None, 990 (jlong)CompileBroker::no_compile, 991 CHECK); 992 } 993 994 _initialized = true; 995 } 996 997 998 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, 999 AbstractCompiler* comp, bool compiler_thread, TRAPS) { 1000 JavaThread* thread = NULL; 1001 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0); 1002 instanceKlassHandle klass (THREAD, k); 1003 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0); 1004 Handle string = java_lang_String::create_from_str(name, CHECK_0); 1005 1006 // Initialize thread_oop to put it into the system threadGroup 1007 Handle thread_group (THREAD, Universe::system_thread_group()); 1008 JavaValue result(T_VOID); 1009 JavaCalls::call_special(&result, thread_oop, 1010 klass, 1011 vmSymbols::object_initializer_name(), 1012 vmSymbols::threadgroup_string_void_signature(), 1013 thread_group, 1014 string, 1015 CHECK_0); 1016 1017 { 1018 MutexLocker mu(Threads_lock, THREAD); 1019 if (compiler_thread) { 1020 thread = new CompilerThread(queue, counters); 1021 } else { 1022 thread = new CodeCacheSweeperThread(); 1023 } 1024 // At this point the new CompilerThread data-races with this startup 1025 // thread (which I believe is the primoridal thread and NOT the VM 1026 // thread). This means Java bytecodes being executed at startup can 1027 // queue compile jobs which will run at whatever default priority the 1028 // newly created CompilerThread runs at. 1029 1030 1031 // At this point it may be possible that no osthread was created for the 1032 // JavaThread due to lack of memory. We would have to throw an exception 1033 // in that case. However, since this must work and we do not allow 1034 // exceptions anyway, check and abort if this fails. 1035 1036 if (thread == NULL || thread->osthread() == NULL) { 1037 vm_exit_during_initialization("java.lang.OutOfMemoryError", 1038 os::native_thread_creation_failed_msg()); 1039 } 1040 1041 java_lang_Thread::set_thread(thread_oop(), thread); 1042 1043 // Note that this only sets the JavaThread _priority field, which by 1044 // definition is limited to Java priorities and not OS priorities. 1045 // The os-priority is set in the CompilerThread startup code itself 1046 1047 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); 1048 1049 // Note that we cannot call os::set_priority because it expects Java 1050 // priorities and we are explicitly using OS priorities so that it's 1051 // possible to set the compiler thread priority higher than any Java 1052 // thread. 1053 1054 int native_prio = CompilerThreadPriority; 1055 if (native_prio == -1) { 1056 if (UseCriticalCompilerThreadPriority) { 1057 native_prio = os::java_to_os_priority[CriticalPriority]; 1058 } else { 1059 native_prio = os::java_to_os_priority[NearMaxPriority]; 1060 } 1061 } 1062 os::set_native_priority(thread, native_prio); 1063 1064 java_lang_Thread::set_daemon(thread_oop()); 1065 1066 thread->set_threadObj(thread_oop()); 1067 if (compiler_thread) { 1068 thread->as_CompilerThread()->set_compiler(comp); 1069 } 1070 Threads::add(thread); 1071 Thread::start(thread); 1072 } 1073 1074 // Let go of Threads_lock before yielding 1075 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS) 1076 1077 return thread; 1078 } 1079 1080 1081 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) { 1082 EXCEPTION_MARK; 1083 #if !defined(ZERO) && !defined(SHARK) 1084 assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?"); 1085 #endif // !ZERO && !SHARK 1086 // Initialize the compilation queue 1087 if (c2_compiler_count > 0) { 1088 _c2_compile_queue = new CompileQueue("C2 compile queue"); 1089 _compilers[1]->set_num_compiler_threads(c2_compiler_count); 1090 } 1091 if (c1_compiler_count > 0) { 1092 _c1_compile_queue = new CompileQueue("C1 compile queue"); 1093 _compilers[0]->set_num_compiler_threads(c1_compiler_count); 1094 } 1095 1096 int compiler_count = c1_compiler_count + c2_compiler_count; 1097 1098 char name_buffer[256]; 1099 const bool compiler_thread = true; 1100 for (int i = 0; i < c2_compiler_count; i++) { 1101 // Create a name for our thread. 1102 sprintf(name_buffer, "C2 CompilerThread%d", i); 1103 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1104 // Shark and C2 1105 make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK); 1106 } 1107 1108 for (int i = c2_compiler_count; i < compiler_count; i++) { 1109 // Create a name for our thread. 1110 sprintf(name_buffer, "C1 CompilerThread%d", i); 1111 CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK); 1112 // C1 1113 make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK); 1114 } 1115 1116 if (UsePerfData) { 1117 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK); 1118 } 1119 1120 if (MethodFlushing) { 1121 // Initialize the sweeper thread 1122 make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK); 1123 } 1124 } 1125 1126 1127 /** 1128 * Set the methods on the stack as on_stack so that redefine classes doesn't 1129 * reclaim them. This method is executed at a safepoint. 1130 / 1131 void CompileBroker::mark_on_stack() { 1132 assert(SafepointSynchronize::is_at_safepoint(), "sanity check"); 1133 // Since we are at a safepoint, we do not need a lock to access 1134 // the compile queues. 1135 if (_c2_compile_queue != NULL) { 1136 _c2_compile_queue->mark_on_stack(); 1137 } 1138 if (_c1_compile_queue != NULL) { 1139 _c1_compile_queue->mark_on_stack(); 1140 } 1141 } 1142 1143 // ------------------------------------------------------------------ 1144 // CompileBroker::compile_method 1145 // 1146 // Request compilation of a method. 1147 void CompileBroker::compile_method_base(methodHandle method, 1148 int osr_bci, 1149 int comp_level, 1150 methodHandle hot_method, 1151 int hot_count, 1152 const char comment, 1153 Thread* thread) { 1154 // do nothing if compiler thread(s) is not available 1155 if (!_initialized) { 1156 return; 1157 } 1158 1159 guarantee(!method->is_abstract(), "cannot compile abstract methods"); 1160 assert(method->method_holder()->oop_is_instance(), 1161 "sanity check"); 1162 assert(!method->method_holder()->is_not_initialized(), 1163 "method holder must be initialized"); 1164 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys"); 1165 1166 if (CIPrintRequests) { 1167 tty->print("request: "); 1168 method->print_short_name(tty); 1169 if (osr_bci != InvocationEntryBci) { 1170 tty->print(" osr_bci: %d", osr_bci); 1171 } 1172 tty->print(" comment: %s count: %d", comment, hot_count); 1173 if (!hot_method.is_null()) { 1174 tty->print(" hot: "); 1175 if (hot_method() != method()) { 1176 hot_method->print_short_name(tty); 1177 } else { 1178 tty->print("yes"); 1179 } 1180 } 1181 tty->cr(); 1182 } 1183 1184 // A request has been made for compilation. Before we do any 1185 // real work, check to see if the method has been compiled 1186 // in the meantime with a definitive result. 1187 if (compilation_is_complete(method, osr_bci, comp_level)) { 1188 return; 1189 } 1190 1191 #ifndef PRODUCT 1192 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) { 1193 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) { 1194 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI. 1195 return; 1196 } 1197 } 1198 #endif 1199 1200 // If this method is already in the compile queue, then 1201 // we do not block the current thread. 1202 if (compilation_is_in_queue(method)) { 1203 // We may want to decay our counter a bit here to prevent 1204 // multiple denied requests for compilation. This is an 1205 // open compilation policy issue. Note: The other possibility, 1206 // in the case that this is a blocking compile request, is to have 1207 // all subsequent blocking requesters wait for completion of 1208 // ongoing compiles. Note that in this case we'll need a protocol 1209 // for freeing the associated compile tasks. [Or we could have 1210 // a single static monitor on which all these waiters sleep.] 1211 return; 1212 } 1213 1214 // If the requesting thread is holding the pending list lock 1215 // then we just return. We can't risk blocking while holding 1216 // the pending list lock or a 3-way deadlock may occur 1217 // between the reference handler thread, a GC (instigated 1218 // by a compiler thread), and compiled method registration. 1219 if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) { 1220 return; 1221 } 1222 1223 if (TieredCompilation) { 1224 // Tiered policy requires MethodCounters to exist before adding a method to 1225 // the queue. Create if we don't have them yet. 1226 method->get_method_counters(thread); 1227 } 1228 1229 // Outputs from the following MutexLocker block: 1230 CompileTask* task = NULL; 1231 bool blocking = false; 1232 CompileQueue* queue = compile_queue(comp_level); 1233 1234 // Acquire our lock. 1235 { 1236 MutexLocker locker(MethodCompileQueue_lock, thread); 1237 1238 // Make sure the method has not slipped into the queues since 1239 // last we checked; note that those checks were "fast bail-outs". 1240 // Here we need to be more careful, see 14012000 below. 1241 if (compilation_is_in_queue(method)) { 1242 return; 1243 } 1244 1245 // We need to check again to see if the compilation has 1246 // completed. A previous compilation may have registered 1247 // some result. 1248 if (compilation_is_complete(method, osr_bci, comp_level)) { 1249 return; 1250 } 1251 1252 // We now know that this compilation is not pending, complete, 1253 // or prohibited. Assign a compile_id to this compilation 1254 // and check to see if it is in our [Start..Stop) range. 1255 int compile_id = assign_compile_id(method, osr_bci); 1256 if (compile_id == 0) { 1257 // The compilation falls outside the allowed range. 1258 return; 1259 } 1260 1261 // Should this thread wait for completion of the compile? 1262 blocking = is_compile_blocking(); 1263 1264 // We will enter the compilation in the queue. 1265 // 14012000: Note that this sets the queued_for_compile bits in 1266 // the target method. We can now reason that a method cannot be 1267 // queued for compilation more than once, as follows: 1268 // Before a thread queues a task for compilation, it first acquires 1269 // the compile queue lock, then checks if the method's queued bits 1270 // are set or it has already been compiled. Thus there can not be two 1271 // instances of a compilation task for the same method on the 1272 // compilation queue. Consider now the case where the compilation 1273 // thread has already removed a task for that method from the queue 1274 // and is in the midst of compiling it. In this case, the 1275 // queued_for_compile bits must be set in the method (and these 1276 // will be visible to the current thread, since the bits were set 1277 // under protection of the compile queue lock, which we hold now. 1278 // When the compilation completes, the compiler thread first sets 1279 // the compilation result and then clears the queued_for_compile 1280 // bits. Neither of these actions are protected by a barrier (or done 1281 // under the protection of a lock), so the only guarantee we have 1282 // (on machines with TSO (Total Store Order)) is that these values 1283 // will update in that order. As a result, the only combinations of 1284 // these bits that the current thread will see are, in temporal order: 1285 // <RESULT, QUEUE> : 1286 // <0, 1> : in compile queue, but not yet compiled 1287 // <1, 1> : compiled but queue bit not cleared 1288 // <1, 0> : compiled and queue bit cleared 1289 // Because we first check the queue bits then check the result bits, 1290 // we are assured that we cannot introduce a duplicate task. 1291 // Note that if we did the tests in the reverse order (i.e. check 1292 // result then check queued bit), we could get the result bit before 1293 // the compilation completed, and the queue bit after the compilation 1294 // completed, and end up introducing a "duplicate" (redundant) task. 1295 // In that case, the compiler thread should first check if a method 1296 // has already been compiled before trying to compile it. 1297 // NOTE: in the event that there are multiple compiler threads and 1298 // there is de-optimization/recompilation, things will get hairy, 1299 // and in that case it's best to protect both the testing (here) of 1300 // these bits, and their updating (here and elsewhere) under a 1301 // common lock. 1302 task = create_compile_task(queue, 1303 compile_id, method, 1304 osr_bci, comp_level, 1305 hot_method, hot_count, comment, 1306 blocking); 1307 } 1308 1309 if (blocking) { 1310 wait_for_completion(task); 1311 } 1312 } 1313 1314 1315 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci, 1316 int comp_level, 1317 methodHandle hot_method, int hot_count, 1318 const char* comment, Thread* THREAD) { 1319 // make sure arguments make sense 1320 assert(method->method_holder()->oop_is_instance(), "not an instance method"); 1321 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range"); 1322 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods"); 1323 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized"); 1324 // allow any levels for WhiteBox 1325 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered"); 1326 // return quickly if possible 1327 1328 // lock, make sure that the compilation 1329 // isn't prohibited in a straightforward way. 1330 AbstractCompiler comp = CompileBroker::compiler(comp_level); 1331 if (comp == NULL || !comp->can_compile_method(method) || 1332 compilation_is_prohibited(method, osr_bci, comp_level)) { 1333 return NULL; 1334 } 1335 1336 if (osr_bci == InvocationEntryBci) { 1337 // standard compilation 1338 nmethod method_code = method->code(); 1339 if (method_code != NULL) { 1340 if (compilation_is_complete(method, osr_bci, comp_level)) { 1341 return method_code; 1342 } 1343 } 1344 if (method->is_not_compilable(comp_level)) { 1345 return NULL; 1346 } 1347 } else { 1348 // osr compilation 1349 #ifndef TIERED 1350 // seems like an assert of dubious value 1351 assert(comp_level == CompLevel_highest_tier, 1352 "all OSR compiles are assumed to be at a single compilation lavel"); 1353 #endif // TIERED 1354 // We accept a higher level osr method 1355 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1356 if (nm != NULL) return nm; 1357 if (method->is_not_osr_compilable(comp_level)) return NULL; 1358 } 1359 1360 assert(!HAS_PENDING_EXCEPTION, "No exception should be present"); 1361 // some prerequisites that are compiler specific 1362 if (comp->is_c2() || comp->is_shark()) { 1363 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL); 1364 // Resolve all classes seen in the signature of the method 1365 // we are compiling. 1366 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL); 1367 } 1368 1369 // If the method is native, do the lookup in the thread requesting 1370 // the compilation. Native lookups can load code, which is not 1371 // permitted during compilation. 1372 // 1373 // Note: A native method implies non-osr compilation which is 1374 // checked with an assertion at the entry of this method. 1375 if (method->is_native() && !method->is_method_handle_intrinsic()) { 1376 bool in_base_library; 1377 address adr = NativeLookup::lookup(method, in_base_library, THREAD); 1378 if (HAS_PENDING_EXCEPTION) { 1379 // In case of an exception looking up the method, we just forget 1380 // about it. The interpreter will kick-in and throw the exception. 1381 method->set_not_compilable(); // implies is_not_osr_compilable() 1382 CLEAR_PENDING_EXCEPTION; 1383 return NULL; 1384 } 1385 assert(method->has_native_function(), "must have native code by now"); 1386 } 1387 1388 // RedefineClasses() has replaced this method; just return 1389 if (method->is_old()) { 1390 return NULL; 1391 } 1392 1393 // JVMTI -- post_compile_event requires jmethod_id() that may require 1394 // a lock the compiling thread can not acquire. Prefetch it here. 1395 if (JvmtiExport::should_post_compiled_method_load()) { 1396 method->jmethod_id(); 1397 } 1398 1399 // do the compilation 1400 if (method->is_native()) { 1401 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) { 1402 // The following native methods: 1403 // 1404 // java.lang.Float.intBitsToFloat 1405 // java.lang.Float.floatToRawIntBits 1406 // java.lang.Double.longBitsToDouble 1407 // java.lang.Double.doubleToRawLongBits 1408 // 1409 // are called through the interpreter even if interpreter native stubs 1410 // are not preferred (i.e., calling through adapter handlers is preferred). 1411 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved 1412 // if the version of the methods from the native libraries is called. 1413 // As the interpreter and the C2-intrinsified version of the methods preserves 1414 // sNaNs, that would result in an inconsistent way of handling of sNaNs. 1415 if ((UseSSE >= 1 && 1416 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat || 1417 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) || 1418 (UseSSE >= 2 && 1419 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble || 1420 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) { 1421 return NULL; 1422 } 1423 1424 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that 1425 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime). 1426 // 1427 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter 1428 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls. 1429 AdapterHandlerLibrary::create_native_wrapper(method); 1430 } else { 1431 return NULL; 1432 } 1433 } else { 1434 // If the compiler is shut off due to code cache getting full 1435 // fail out now so blocking compiles dont hang the java thread 1436 if (!should_compile_new_jobs()) { 1437 CompilationPolicy::policy()->delay_compilation(method()); 1438 return NULL; 1439 } 1440 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD); 1441 } 1442 1443 // return requested nmethod 1444 // We accept a higher level osr method 1445 return osr_bci == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false); 1446 } 1447 1448 1449 // ------------------------------------------------------------------ 1450 // CompileBroker::compilation_is_complete 1451 // 1452 // See if compilation of this method is already complete. 1453 bool CompileBroker::compilation_is_complete(methodHandle method, 1454 int osr_bci, 1455 int comp_level) { 1456 bool is_osr = (osr_bci != standard_entry_bci); 1457 if (is_osr) { 1458 if (method->is_not_osr_compilable(comp_level)) { 1459 return true; 1460 } else { 1461 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true); 1462 return (result != NULL); 1463 } 1464 } else { 1465 if (method->is_not_compilable(comp_level)) { 1466 return true; 1467 } else { 1468 nmethod* result = method->code(); 1469 if (result == NULL) return false; 1470 return comp_level == result->comp_level(); 1471 } 1472 } 1473 } 1474 1475 1476 /** 1477 * See if this compilation is already requested. 1478 * 1479 * Implementation note: there is only a single "is in queue" bit 1480 * for each method. This means that the check below is overly 1481 * conservative in the sense that an osr compilation in the queue 1482 * will block a normal compilation from entering the queue (and vice 1483 * versa). This can be remedied by a full queue search to disambiguate 1484 * cases. If it is deemed profitable, this may be done. 1485 / 1486 bool CompileBroker::compilation_is_in_queue(methodHandle method) { 1487 return method->queued_for_compilation(); 1488 } 1489 1490 // ------------------------------------------------------------------ 1491 // CompileBroker::compilation_is_prohibited 1492 // 1493 // See if this compilation is not allowed. 1494 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) { 1495 bool is_native = method->is_native(); 1496 // Some compilers may not support the compilation of natives. 1497 AbstractCompiler comp = compiler(comp_level); 1498 if (is_native && 1499 (!CICompileNatives || comp == NULL || !comp->supports_native())) { 1500 method->set_not_compilable_quietly(comp_level); 1501 return true; 1502 } 1503 1504 bool is_osr = (osr_bci != standard_entry_bci); 1505 // Some compilers may not support on stack replacement. 1506 if (is_osr && 1507 (!CICompileOSR || comp == NULL || !comp->supports_osr())) { 1508 method->set_not_osr_compilable(comp_level); 1509 return true; 1510 } 1511 1512 // The method may be explicitly excluded by the user. 1513 bool quietly; 1514 double scale; 1515 if (CompilerOracle::should_exclude(method, quietly) 1516 || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) { 1517 if (!quietly) { 1518 // This does not happen quietly... 1519 ResourceMark rm; 1520 tty->print("### Excluding %s:%s", 1521 method->is_native() ? "generation of native wrapper" : "compile", 1522 (method->is_static() ? " static" : "")); 1523 method->print_short_name(tty); 1524 tty->cr(); 1525 } 1526 method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle"); 1527 } 1528 1529 return false; 1530 } 1531 1532 / 1533 * Generate serialized IDs for compilation requests. If certain debugging flags are used 1534 * and the ID is not within the specified range, the method is not compiled and 0 is returned. 1535 * The function also allows to generate separate compilation IDs for OSR compilations. 1536 / 1537 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) { 1538 #ifdef ASSERT 1539 bool is_osr = (osr_bci != standard_entry_bci); 1540 int id; 1541 if (method->is_native()) { 1542 assert(!is_osr, "can't be osr"); 1543 // Adapters, native wrappers and method handle intrinsics 1544 // should be generated always. 1545 return Atomic::add(1, &_compilation_id); 1546 } else if (CICountOSR && is_osr) { 1547 id = Atomic::add(1, &_osr_compilation_id); 1548 if (CIStartOSR <= id && id < CIStopOSR) { 1549 return id; 1550 } 1551 } else { 1552 id = Atomic::add(1, &_compilation_id); 1553 if (CIStart <= id && id < CIStop) { 1554 return id; 1555 } 1556 } 1557 1558 // Method was not in the appropriate compilation range. 1559 method->set_not_compilable_quietly(); 1560 return 0; 1561 #else 1562 // CICountOSR is a develop flag and set to 'false' by default. In a product built, 1563 // only _compilation_id is incremented. 1564 return Atomic::add(1, &_compilation_id); 1565 #endif 1566 } 1567 1568 /* 1569 * Should the current thread block until this compilation request 1570 * has been fulfilled? 1571 / 1572 bool CompileBroker::is_compile_blocking() { 1573 assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock"); 1574 return !BackgroundCompilation; 1575 } 1576 1577 1578 // ------------------------------------------------------------------ 1579 // CompileBroker::preload_classes 1580 void CompileBroker::preload_classes(methodHandle method, TRAPS) { 1581 // Move this code over from c1_Compiler.cpp 1582 ShouldNotReachHere(); 1583 } 1584 1585 1586 // ------------------------------------------------------------------ 1587 // CompileBroker::create_compile_task 1588 // 1589 // Create a CompileTask object representing the current request for 1590 // compilation. Add this task to the queue. 1591 CompileTask CompileBroker::create_compile_task(CompileQueue* queue, 1592 int compile_id, 1593 methodHandle method, 1594 int osr_bci, 1595 int comp_level, 1596 methodHandle hot_method, 1597 int hot_count, 1598 const char* comment, 1599 bool blocking) { 1600 CompileTask* new_task = CompileTask::allocate(); 1601 new_task->initialize(compile_id, method, osr_bci, comp_level, 1602 hot_method, hot_count, comment, 1603 blocking); 1604 queue->add(new_task); 1605 return new_task; 1606 } 1607 1608 1609 /** 1610 * Wait for the compilation task to complete. 1611 / 1612 void CompileBroker::wait_for_completion(CompileTask task) { 1613 if (CIPrintCompileQueue) { 1614 ttyLocker ttyl; 1615 tty->print_cr("BLOCKING FOR COMPILE"); 1616 } 1617 1618 assert(task->is_blocking(), "can only wait on blocking task"); 1619 1620 JavaThread* thread = JavaThread::current(); 1621 thread->set_blocked_on_compilation(true); 1622 1623 methodHandle method(thread, task->method()); 1624 { 1625 MutexLocker waiter(task->lock(), thread); 1626 1627 while (!task->is_complete() && !is_compilation_disabled_forever()) { 1628 task->lock()->wait(); 1629 } 1630 } 1631 1632 thread->set_blocked_on_compilation(false); 1633 if (is_compilation_disabled_forever()) { 1634 CompileTask::free(task); 1635 return; 1636 } 1637 1638 // It is harmless to check this status without the lock, because 1639 // completion is a stable property (until the task object is recycled). 1640 assert(task->is_complete(), "Compilation should have completed"); 1641 assert(task->code_handle() == NULL, "must be reset"); 1642 1643 // By convention, the waiter is responsible for recycling a 1644 // blocking CompileTask. Since there is only one waiter ever 1645 // waiting on a CompileTask, we know that no one else will 1646 // be using this CompileTask; we can free it. 1647 CompileTask::free(task); 1648 } 1649 1650 /** 1651 * Initialize compiler thread(s) + compiler object(s). The postcondition 1652 * of this function is that the compiler runtimes are initialized and that 1653 * compiler threads can start compiling. 1654 / 1655 bool CompileBroker::init_compiler_runtime() { 1656 CompilerThread thread = CompilerThread::current(); 1657 AbstractCompiler* comp = thread->compiler(); 1658 // Final sanity check - the compiler object must exist 1659 guarantee(comp != NULL, "Compiler object must exist"); 1660 1661 int system_dictionary_modification_counter; 1662 { 1663 MutexLocker locker(Compile_lock, thread); 1664 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1665 } 1666 1667 { 1668 // Must switch to native to allocate ci_env 1669 ThreadToNativeFromVM ttn(thread); 1670 ciEnv ci_env(NULL, system_dictionary_modification_counter); 1671 // Cache Jvmti state 1672 ci_env.cache_jvmti_state(); 1673 // Cache DTrace flags 1674 ci_env.cache_dtrace_flags(); 1675 1676 // Switch back to VM state to do compiler initialization 1677 ThreadInVMfromNative tv(thread); 1678 ResetNoHandleMark rnhm; 1679 1680 1681 if (!comp->is_shark()) { 1682 // Perform per-thread and global initializations 1683 comp->initialize(); 1684 } 1685 } 1686 1687 if (comp->is_failed()) { 1688 disable_compilation_forever(); 1689 // If compiler initialization failed, no compiler thread that is specific to a 1690 // particular compiler runtime will ever start to compile methods. 1691 shutdown_compiler_runtime(comp, thread); 1692 return false; 1693 } 1694 1695 // C1 specific check 1696 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) { 1697 warning("Initialization of %s thread failed (no space to run compilers)", thread->name()); 1698 return false; 1699 } 1700 1701 return true; 1702 } 1703 1704 /** 1705 * If C1 and/or C2 initialization failed, we shut down all compilation. 1706 * We do this to keep things simple. This can be changed if it ever turns 1707 * out to be a problem. 1708 / 1709 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler comp, CompilerThread* thread) { 1710 // Free buffer blob, if allocated 1711 if (thread->get_buffer_blob() != NULL) { 1712 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1713 CodeCache::free(thread->get_buffer_blob()); 1714 } 1715 1716 if (comp->should_perform_shutdown()) { 1717 // There are two reasons for shutting down the compiler 1718 // 1) compiler runtime initialization failed 1719 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing 1720 warning("%s initialization failed. Shutting down all compilers", comp->name()); 1721 1722 // Only one thread per compiler runtime object enters here 1723 // Set state to shut down 1724 comp->set_shut_down(); 1725 1726 // Delete all queued compilation tasks to make compiler threads exit faster. 1727 if (_c1_compile_queue != NULL) { 1728 _c1_compile_queue->free_all(); 1729 } 1730 1731 if (_c2_compile_queue != NULL) { 1732 _c2_compile_queue->free_all(); 1733 } 1734 1735 // Set flags so that we continue execution with using interpreter only. 1736 UseCompiler = false; 1737 UseInterpreter = true; 1738 1739 // We could delete compiler runtimes also. However, there are references to 1740 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then 1741 // fail. This can be done later if necessary. 1742 } 1743 } 1744 1745 // ------------------------------------------------------------------ 1746 // CompileBroker::compiler_thread_loop 1747 // 1748 // The main loop run by a CompilerThread. 1749 void CompileBroker::compiler_thread_loop() { 1750 CompilerThread* thread = CompilerThread::current(); 1751 CompileQueue* queue = thread->queue(); 1752 // For the thread that initializes the ciObjectFactory 1753 // this resource mark holds all the shared objects 1754 ResourceMark rm; 1755 1756 // First thread to get here will initialize the compiler interface 1757 1758 if (!ciObjectFactory::is_initialized()) { 1759 ASSERT_IN_VM; 1760 MutexLocker only_one (CompileThread_lock, thread); 1761 if (!ciObjectFactory::is_initialized()) { 1762 ciObjectFactory::initialize(); 1763 } 1764 } 1765 1766 // Open a log. 1767 if (LogCompilation) { 1768 init_compiler_thread_log(); 1769 } 1770 CompileLog* log = thread->log(); 1771 if (log != NULL) { 1772 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'", 1773 thread->name(), 1774 os::current_thread_id(), 1775 os::current_process_id()); 1776 log->stamp(); 1777 log->end_elem(); 1778 } 1779 1780 // If compiler thread/runtime initialization fails, exit the compiler thread 1781 if (!init_compiler_runtime()) { 1782 return; 1783 } 1784 1785 // Poll for new compilation tasks as long as the JVM runs. Compilation 1786 // should only be disabled if something went wrong while initializing the 1787 // compiler runtimes. This, in turn, should not happen. The only known case 1788 // when compiler runtime initialization fails is if there is not enough free 1789 // space in the code cache to generate the necessary stubs, etc. 1790 while (!is_compilation_disabled_forever()) { 1791 // We need this HandleMark to avoid leaking VM handles. 1792 HandleMark hm(thread); 1793 1794 CompileTask* task = queue->get(); 1795 if (task == NULL) { 1796 continue; 1797 } 1798 1799 // Give compiler threads an extra quanta. They tend to be bursty and 1800 // this helps the compiler to finish up the job. 1801 if (CompilerThreadHintNoPreempt) { 1802 os::hint_no_preempt(); 1803 } 1804 1805 // trace per thread time and compile statistics 1806 CompilerCounters* counters = ((CompilerThread*)thread)->counters(); 1807 PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter()); 1808 1809 // Assign the task to the current thread. Mark this compilation 1810 // thread as active for the profiler. 1811 CompileTaskWrapper ctw(task); 1812 nmethodLocker result_handle; // (handle for the nmethod produced by this task) 1813 task->set_code_handle(&result_handle); 1814 methodHandle method(thread, task->method()); 1815 1816 // Never compile a method if breakpoints are present in it 1817 if (method()->number_of_breakpoints() == 0) { 1818 // Compile the method. 1819 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) { 1820 invoke_compiler_on_method(task); 1821 } else { 1822 // After compilation is disabled, remove remaining methods from queue 1823 method->clear_queued_for_compilation(); 1824 task->set_failure_reason("compilation is disabled"); 1825 } 1826 } 1827 } 1828 1829 // Shut down compiler runtime 1830 shutdown_compiler_runtime(thread->compiler(), thread); 1831 } 1832 1833 // ------------------------------------------------------------------ 1834 // CompileBroker::init_compiler_thread_log 1835 // 1836 // Set up state required by +LogCompilation. 1837 void CompileBroker::init_compiler_thread_log() { 1838 CompilerThread* thread = CompilerThread::current(); 1839 char file_name[4K]; 1840 FILE fp = NULL; 1841 intx thread_id = os::current_thread_id(); 1842 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) { 1843 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL); 1844 if (dir == NULL) { 1845 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log", 1846 thread_id, os::current_process_id()); 1847 } else { 1848 jio_snprintf(file_name, sizeof(file_name), 1849 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir, 1850 os::file_separator(), thread_id, os::current_process_id()); 1851 } 1852 1853 fp = fopen(file_name, "wt"); 1854 if (fp != NULL) { 1855 if (LogCompilation && Verbose) { 1856 tty->print_cr("Opening compilation log %s", file_name); 1857 } 1858 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id); 1859 thread->init_log(log); 1860 1861 if (xtty != NULL) { 1862 ttyLocker ttyl; 1863 // Record any per thread log files 1864 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name); 1865 } 1866 return; 1867 } 1868 } 1869 warning("Cannot open log file: %s", file_name); 1870 } 1871 1872 void CompileBroker::log_metaspace_failure() { 1873 const char* message = "some methods may not be compiled because metaspace " 1874 "is out of memory"; 1875 if (_compilation_log != NULL) { 1876 _compilation_log->log_metaspace_failure(message); 1877 } 1878 if (PrintCompilation) { 1879 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message); 1880 } 1881 } 1882 1883 1884 // ------------------------------------------------------------------ 1885 // CompileBroker::set_should_block 1886 // 1887 // Set _should_block. 1888 // Call this from the VM, with Threads_lock held and a safepoint requested. 1889 void CompileBroker::set_should_block() { 1890 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); 1891 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already"); 1892 #ifndef PRODUCT 1893 if (PrintCompilation && (Verbose || WizardMode)) 1894 tty->print_cr("notifying compiler thread pool to block"); 1895 #endif 1896 _should_block = true; 1897 } 1898 1899 // ------------------------------------------------------------------ 1900 // CompileBroker::maybe_block 1901 // 1902 // Call this from the compiler at convenient points, to poll for _should_block. 1903 void CompileBroker::maybe_block() { 1904 if (_should_block) { 1905 #ifndef PRODUCT 1906 if (PrintCompilation && (Verbose || WizardMode)) 1907 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current())); 1908 #endif 1909 ThreadInVMfromNative tivfn(JavaThread::current()); 1910 } 1911 } 1912 1913 // wrapper for CodeCache::print_summary() 1914 static void codecache_print(bool detailed) 1915 { 1916 ResourceMark rm; 1917 stringStream s; 1918 // Dump code cache into a buffer before locking the tty, 1919 { 1920 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1921 CodeCache::print_summary(&s, detailed); 1922 } 1923 ttyLocker ttyl; 1924 tty->print("%s", s.as_string()); 1925 } 1926 1927 // ------------------------------------------------------------------ 1928 // CompileBroker::invoke_compiler_on_method 1929 // 1930 // Compile a method. 1931 // 1932 void CompileBroker::invoke_compiler_on_method(CompileTask* task) { 1933 if (PrintCompilation) { 1934 ResourceMark rm; 1935 task->print_tty(); 1936 } 1937 elapsedTimer time; 1938 1939 CompilerThread* thread = CompilerThread::current(); 1940 ResourceMark rm(thread); 1941 1942 if (LogEvents) { 1943 _compilation_log->log_compile(thread, task); 1944 } 1945 1946 // Common flags. 1947 uint compile_id = task->compile_id(); 1948 int osr_bci = task->osr_bci(); 1949 bool is_osr = (osr_bci != standard_entry_bci); 1950 bool should_log = (thread->log() != NULL); 1951 bool should_break = false; 1952 int task_level = task->comp_level(); 1953 { 1954 // create the handle inside it's own block so it can't 1955 // accidentally be referenced once the thread transitions to 1956 // native. The NoHandleMark before the transition should catch 1957 // any cases where this occurs in the future. 1958 methodHandle method(thread, task->method()); 1959 should_break = check_break_at(method, compile_id, is_osr); 1960 if (should_log && !CompilerOracle::should_log(method)) { 1961 should_log = false; 1962 } 1963 assert(!method->is_native(), "no longer compile natives"); 1964 1965 // Save information about this method in case of failure. 1966 set_last_compile(thread, method, is_osr, task_level); 1967 1968 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level)); 1969 } 1970 1971 // Allocate a new set of JNI handles. 1972 push_jni_handle_block(); 1973 Method* target_handle = task->method(); 1974 int compilable = ciEnv::MethodCompilable; 1975 { 1976 int system_dictionary_modification_counter; 1977 { 1978 MutexLocker locker(Compile_lock, thread); 1979 system_dictionary_modification_counter = SystemDictionary::number_of_modifications(); 1980 } 1981 1982 NoHandleMark nhm; 1983 ThreadToNativeFromVM ttn(thread); 1984 1985 ciEnv ci_env(task, system_dictionary_modification_counter); 1986 if (should_break) { 1987 ci_env.set_break_at_compile(true); 1988 } 1989 if (should_log) { 1990 ci_env.set_log(thread->log()); 1991 } 1992 assert(thread->env() == &ci_env, "set by ci_env"); 1993 // The thread-env() field is cleared in ~CompileTaskWrapper. 1994 1995 // Cache Jvmti state 1996 ci_env.cache_jvmti_state(); 1997 1998 // Cache DTrace flags 1999 ci_env.cache_dtrace_flags(); 2000 2001 ciMethod* target = ci_env.get_method_from_handle(target_handle); 2002 2003 TraceTime t1("compilation", &time); 2004 EventCompilation event; 2005 2006 AbstractCompiler comp = compiler(task_level); 2007 if (comp == NULL) { 2008 ci_env.record_method_not_compilable("no compiler", !TieredCompilation); 2009 } else { 2010 if (WhiteBoxAPI && WhiteBox::compilation_locked) { 2011 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag); 2012 while (WhiteBox::compilation_locked) { 2013 locker.wait(Mutex::_no_safepoint_check_flag); 2014 } 2015 } 2016 comp->compile_method(&ci_env, target, osr_bci); 2017 } 2018 2019 if (!ci_env.failing() && task->code() == NULL) { 2020 //assert(false, "compiler should always document failure"); 2021 // The compiler elected, without comment, not to register a result. 2022 // Do not attempt further compilations of this method. 2023 ci_env.record_method_not_compilable("compile failed", !TieredCompilation); 2024 } 2025 2026 // Copy this bit to the enclosing block: 2027 compilable = ci_env.compilable(); 2028 2029 if (ci_env.failing()) { 2030 task->set_failure_reason(ci_env.failure_reason()); 2031 ci_env.report_failure(ci_env.failure_reason()); 2032 const char retry_message = ci_env.retry_message(); 2033 if (_compilation_log != NULL) { 2034 _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message); 2035 } 2036 if (PrintCompilation) { 2037 FormatBufferResource msg = retry_message != NULL ? 2038 err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) : 2039 err_msg_res("COMPILE SKIPPED: %s", ci_env.failure_reason()); 2040 task->print_compilation(tty, msg); 2041 } 2042 } else { 2043 task->mark_success(); 2044 task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes()); 2045 if (_compilation_log != NULL) { 2046 nmethod* code = task->code(); 2047 if (code != NULL) { 2048 _compilation_log->log_nmethod(thread, code); 2049 } 2050 } 2051 } 2052 // simulate crash during compilation 2053 assert(task->compile_id() != CICrashAt, "just as planned"); 2054 if (event.should_commit()) { 2055 event.set_method(target->get_Method()); 2056 event.set_compileID(compile_id); 2057 event.set_compileLevel(task->comp_level()); 2058 event.set_succeded(task->is_success()); 2059 event.set_isOsr(is_osr); 2060 event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size()); 2061 event.set_inlinedBytes(task->num_inlined_bytecodes()); 2062 event.commit(); 2063 } 2064 } 2065 pop_jni_handle_block(); 2066 2067 methodHandle method(thread, task->method()); 2068 2069 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success()); 2070 2071 collect_statistics(thread, time, task); 2072 2073 if (PrintCompilation && PrintCompilation2) { 2074 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp 2075 tty->print("%4d ", compile_id); // print compilation number 2076 tty->print("%s ", (is_osr ? "%" : " ")); 2077 if (task->code() != NULL) { 2078 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size()); 2079 } 2080 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes()); 2081 } 2082 2083 if (PrintCodeCacheOnCompilation) 2084 codecache_print(/* detailed= / false); 2085 2086 // Disable compilation, if required. 2087 switch (compilable) { 2088 case ciEnv::MethodCompilable_never: 2089 if (is_osr) 2090 method->set_not_osr_compilable_quietly(); 2091 else 2092 method->set_not_compilable_quietly(); 2093 break; 2094 case ciEnv::MethodCompilable_not_at_tier: 2095 if (is_osr) 2096 method->set_not_osr_compilable_quietly(task_level); 2097 else 2098 method->set_not_compilable_quietly(task_level); 2099 break; 2100 } 2101 2102 // Note that the queued_for_compilation bits are cleared without 2103 // protection of a mutex. [They were set by the requester thread, 2104 // when adding the task to the compile queue -- at which time the 2105 // compile queue lock was held. Subsequently, we acquired the compile 2106 // queue lock to get this task off the compile queue; thus (to belabour 2107 // the point somewhat) our clearing of the bits must be occurring 2108 // only after the setting of the bits. See also 14012000 above. 2109 method->clear_queued_for_compilation(); 2110 2111 #ifdef ASSERT 2112 if (CollectedHeap::fired_fake_oom()) { 2113 // The current compile received a fake OOM during compilation so 2114 // go ahead and exit the VM since the test apparently succeeded 2115 tty->print_cr("** Shutting down VM after successful fake OOM"); 2116 vm_exit(0); 2117 } 2118 #endif 2119 } 2120 2121 /** 2122 * The CodeCache is full. Print warning and disable compilation. 2123 * Schedule code cache cleaning so compilation can continue later. 2124 * This function needs to be called only from CodeCache::allocate(), 2125 * since we currently handle a full code cache uniformly. 2126 / 2127 void CompileBroker::handle_full_code_cache(int code_blob_type) { 2128 UseInterpreter = true; 2129 if (UseCompiler || AlwaysCompileLoopMethods ) { 2130 if (xtty != NULL) { 2131 ResourceMark rm; 2132 stringStream s; 2133 // Dump code cache state into a buffer before locking the tty, 2134 // because log_state() will use locks causing lock conflicts. 2135 CodeCache::log_state(&s); 2136 // Lock to prevent tearing 2137 ttyLocker ttyl; 2138 xtty->begin_elem("code_cache_full"); 2139 xtty->print("%s", s.as_string()); 2140 xtty->stamp(); 2141 xtty->end_elem(); 2142 } 2143 2144 #ifndef PRODUCT 2145 if (CompileTheWorld || ExitOnFullCodeCache) { 2146 codecache_print(/ detailed= / true); 2147 before_exit(JavaThread::current()); 2148 exit_globals(); // will delete tty 2149 vm_direct_exit(CompileTheWorld ? 0 : 1); 2150 } 2151 #endif 2152 if (UseCodeCacheFlushing) { 2153 // Since code cache is full, immediately stop new compiles 2154 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { 2155 NMethodSweeper::log_sweep("disable_compiler"); 2156 } 2157 } else { 2158 disable_compilation_forever(); 2159 } 2160 2161 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning()); 2162 } 2163 } 2164 2165 // ------------------------------------------------------------------ 2166 // CompileBroker::set_last_compile 2167 // 2168 // Record this compilation for debugging purposes. 2169 void CompileBroker::set_last_compile(CompilerThread thread, methodHandle method, bool is_osr, int comp_level) { 2170 ResourceMark rm; 2171 char* method_name = method->name()->as_C_string(); 2172 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length); 2173 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated 2174 char current_method[CompilerCounters::cmname_buffer_length]; 2175 size_t maxLen = CompilerCounters::cmname_buffer_length; 2176 2177 if (UsePerfData) { 2178 const char* class_name = method->method_holder()->name()->as_C_string(); 2179 2180 size_t s1len = strlen(class_name); 2181 size_t s2len = strlen(method_name); 2182 2183 // check if we need to truncate the string 2184 if (s1len + s2len + 2 > maxLen) { 2185 2186 // the strategy is to lop off the leading characters of the 2187 // class name and the trailing characters of the method name. 2188 2189 if (s2len + 2 > maxLen) { 2190 // lop of the entire class name string, let snprintf handle 2191 // truncation of the method name. 2192 class_name += s1len; // null string 2193 } 2194 else { 2195 // lop off the extra characters from the front of the class name 2196 class_name += ((s1len + s2len + 2) - maxLen); 2197 } 2198 } 2199 2200 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name); 2201 } 2202 2203 if (CICountOSR && is_osr) { 2204 _last_compile_type = osr_compile; 2205 } else { 2206 _last_compile_type = normal_compile; 2207 } 2208 _last_compile_level = comp_level; 2209 2210 if (UsePerfData) { 2211 CompilerCounters* counters = thread->counters(); 2212 counters->set_current_method(current_method); 2213 counters->set_compile_type((jlong)_last_compile_type); 2214 } 2215 } 2216 2217 2218 // ------------------------------------------------------------------ 2219 // CompileBroker::push_jni_handle_block 2220 // 2221 // Push on a new block of JNI handles. 2222 void CompileBroker::push_jni_handle_block() { 2223 JavaThread* thread = JavaThread::current(); 2224 2225 // Allocate a new block for JNI handles. 2226 // Inlined code from jni_PushLocalFrame() 2227 JNIHandleBlock* java_handles = thread->active_handles(); 2228 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread); 2229 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL"); 2230 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd. 2231 thread->set_active_handles(compile_handles); 2232 } 2233 2234 2235 // ------------------------------------------------------------------ 2236 // CompileBroker::pop_jni_handle_block 2237 // 2238 // Pop off the current block of JNI handles. 2239 void CompileBroker::pop_jni_handle_block() { 2240 JavaThread* thread = JavaThread::current(); 2241 2242 // Release our JNI handle block 2243 JNIHandleBlock* compile_handles = thread->active_handles(); 2244 JNIHandleBlock* java_handles = compile_handles->pop_frame_link(); 2245 thread->set_active_handles(java_handles); 2246 compile_handles->set_pop_frame_link(NULL); 2247 JNIHandleBlock::release_block(compile_handles, thread); // may block 2248 } 2249 2250 2251 // ------------------------------------------------------------------ 2252 // CompileBroker::check_break_at 2253 // 2254 // Should the compilation break at the current compilation. 2255 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) { 2256 if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) { 2257 return true; 2258 } else if( CompilerOracle::should_break_at(method) ) { // break when compiling 2259 return true; 2260 } else { 2261 return (compile_id == CIBreakAt); 2262 } 2263 } 2264 2265 // ------------------------------------------------------------------ 2266 // CompileBroker::collect_statistics 2267 // 2268 // Collect statistics about the compilation. 2269 2270 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) { 2271 bool success = task->is_success(); 2272 methodHandle method (thread, task->method()); 2273 uint compile_id = task->compile_id(); 2274 bool is_osr = (task->osr_bci() != standard_entry_bci); 2275 nmethod* code = task->code(); 2276 CompilerCounters* counters = thread->counters(); 2277 2278 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker"); 2279 MutexLocker locker(CompileStatistics_lock); 2280 2281 // _perf variables are production performance counters which are 2282 // updated regardless of the setting of the CITime and CITimeEach flags 2283 // 2284 2285 // account all time, including bailouts and failures in this counter; 2286 // C1 and C2 counters are counting both successful and unsuccessful compiles 2287 _t_total_compilation.add(time); 2288 2289 if (!success) { 2290 _total_bailout_count++; 2291 if (UsePerfData) { 2292 _perf_last_failed_method->set_value(counters->current_method()); 2293 _perf_last_failed_type->set_value(counters->compile_type()); 2294 _perf_total_bailout_count->inc(); 2295 } 2296 _t_bailedout_compilation.add(time); 2297 } else if (code == NULL) { 2298 if (UsePerfData) { 2299 _perf_last_invalidated_method->set_value(counters->current_method()); 2300 _perf_last_invalidated_type->set_value(counters->compile_type()); 2301 _perf_total_invalidated_count->inc(); 2302 } 2303 _total_invalidated_count++; 2304 _t_invalidated_compilation.add(time); 2305 } else { 2306 // Compilation succeeded 2307 2308 // update compilation ticks - used by the implementation of 2309 // java.lang.management.CompilationMBean 2310 _perf_total_compilation->inc(time.ticks()); 2311 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time; 2312 2313 if (CITime) { 2314 if (is_osr) { 2315 _t_osr_compilation.add(time); 2316 _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2317 } else { 2318 _t_standard_compilation.add(time); 2319 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes(); 2320 } 2321 } 2322 2323 if (UsePerfData) { 2324 // save the name of the last method compiled 2325 _perf_last_method->set_value(counters->current_method()); 2326 _perf_last_compile_type->set_value(counters->compile_type()); 2327 _perf_last_compile_size->set_value(method->code_size() + 2328 task->num_inlined_bytecodes()); 2329 if (is_osr) { 2330 _perf_osr_compilation->inc(time.ticks()); 2331 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2332 } else { 2333 _perf_standard_compilation->inc(time.ticks()); 2334 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes()); 2335 } 2336 } 2337 2338 if (CITimeEach) { 2339 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds(); 2340 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)", 2341 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes()); 2342 } 2343 2344 // Collect counts of successful compilations 2345 _sum_nmethod_size += code->total_size(); 2346 _sum_nmethod_code_size += code->insts_size(); 2347 _total_compile_count++; 2348 2349 if (UsePerfData) { 2350 _perf_sum_nmethod_size->inc( code->total_size()); 2351 _perf_sum_nmethod_code_size->inc(code->insts_size()); 2352 _perf_total_compile_count->inc(); 2353 } 2354 2355 if (is_osr) { 2356 if (UsePerfData) _perf_total_osr_compile_count->inc(); 2357 _total_osr_compile_count++; 2358 } else { 2359 if (UsePerfData) _perf_total_standard_compile_count->inc(); 2360 _total_standard_compile_count++; 2361 } 2362 } 2363 // set the current method for the thread to null 2364 if (UsePerfData) counters->set_current_method(""); 2365 } 2366 2367 const char* CompileBroker::compiler_name(int comp_level) { 2368 AbstractCompiler *comp = CompileBroker::compiler(comp_level); 2369 if (comp == NULL) { 2370 return "no compiler"; 2371 } else { 2372 return (comp->name()); 2373 } 2374 } 2375 2376 void CompileBroker::print_times() { 2377 tty->cr(); 2378 tty->print_cr("Accumulated compiler times"); 2379 tty->print_cr("----------------------------------------------------------"); 2380 //0000000000111111111122222222223333333333444444444455555555556666666666 2381 //0123456789012345678901234567890123456789012345678901234567890123456789 2382 tty->print_cr(" Total compilation time : %7.3f s", CompileBroker::_t_total_compilation.seconds()); 2383 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s", 2384 CompileBroker::_t_standard_compilation.seconds(), 2385 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count); 2386 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s", 2387 CompileBroker::_t_bailedout_compilation.seconds(), 2388 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count); 2389 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s", 2390 CompileBroker::_t_osr_compilation.seconds(), 2391 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count); 2392 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s", 2393 CompileBroker::_t_invalidated_compilation.seconds(), 2394 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count); 2395 2396 AbstractCompiler comp = compiler(CompLevel_simple); 2397 if (comp != NULL) { 2398 tty->cr(); 2399 comp->print_timers(); 2400 } 2401 comp = compiler(CompLevel_full_optimization); 2402 if (comp != NULL) { 2403 tty->cr(); 2404 comp->print_timers(); 2405 } 2406 tty->cr(); 2407 tty->print_cr(" Total compiled methods : %8d methods", CompileBroker::_total_compile_count); 2408 tty->print_cr(" Standard compilation : %8d methods", CompileBroker::_total_standard_compile_count); 2409 tty->print_cr(" On stack replacement : %8d methods", CompileBroker::_total_osr_compile_count); 2410 int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled; 2411 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb); 2412 tty->print_cr(" Standard compilation : %8d bytes", CompileBroker::_sum_standard_bytes_compiled); 2413 tty->print_cr(" On stack replacement : %8d bytes", CompileBroker::_sum_osr_bytes_compiled); 2414 int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds()); 2415 tty->print_cr(" Average compilation speed : %8d bytes/s", bps); 2416 tty->cr(); 2417 tty->print_cr(" nmethod code size : %8d bytes", CompileBroker::_sum_nmethod_code_size); 2418 tty->print_cr(" nmethod total size : %8d bytes", CompileBroker::_sum_nmethod_size); 2419 } 2420 2421 // Debugging output for failure 2422 void CompileBroker::print_last_compile() { 2423 if ( _last_compile_level != CompLevel_none && 2424 compiler(_last_compile_level) != NULL && 2425 _last_method_compiled != NULL && 2426 _last_compile_type != no_compile) { 2427 if (_last_compile_type == osr_compile) { 2428 tty->print_cr("Last parse: [osr]%d+++(%d) %s", 2429 _osr_compilation_id, _last_compile_level, _last_method_compiled); 2430 } else { 2431 tty->print_cr("Last parse: %d+++(%d) %s", 2432 _compilation_id, _last_compile_level, _last_method_compiled); 2433 } 2434 } 2435 } 2436 2437 2438 void CompileBroker::print_compiler_threads_on(outputStream st) { 2439 #ifndef PRODUCT 2440 st->print_cr("Compiler thread printing unimplemented."); 2441 st->cr(); 2442 #endif 2443 }