rev 8995 : 8046155: JEP165: Compiler Control
Summary:
Reviewed-by:

   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 class CompilationLog : public StringEventLog {
 161  public:
 162   CompilationLog() : StringEventLog("Compilation events") {
 163   }
 164 
 165   void log_compile(JavaThread* thread, CompileTask* task) {
 166     StringLogMessage lm;
 167     stringStream sstr = lm.stream();
 168     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 169     task->print(&sstr, NULL, true, false);
 170     log(thread, "%s", (const char*)lm);
 171   }
 172 
 173   void log_nmethod(JavaThread* thread, nmethod* nm) {
 174     log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 175         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 176         p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
 177   }
 178 
 179   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 180     StringLogMessage lm;
 181     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 182     if (retry_message != NULL) {
 183       lm.append(" (%s)", retry_message);
 184     }
 185     lm.print("\n");
 186     log(thread, "%s", (const char*)lm);
 187   }
 188 
 189   void log_metaspace_failure(const char* reason) {
 190     ResourceMark rm;
 191     StringLogMessage lm;
 192     lm.print("%4d   COMPILE PROFILING SKIPPED: %s", -1, reason);
 193     lm.print("\n");
 194     log(JavaThread::current(), "%s", (const char*)lm);
 195   }
 196 };
 197 
 198 static CompilationLog* _compilation_log = NULL;
 199 
 200 void compileBroker_init() {
 201   if (LogEvents) {
 202     _compilation_log = new CompilationLog();
 203   }















 204 }
 205 
 206 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 207   CompilerThread* thread = CompilerThread::current();
 208   thread->set_task(task);
 209   CompileLog*     log  = thread->log();
 210   if (log != NULL)  task->log_task_start(log);
 211 }
 212 
 213 CompileTaskWrapper::~CompileTaskWrapper() {
 214   CompilerThread* thread = CompilerThread::current();
 215   CompileTask* task = thread->task();
 216   CompileLog*  log  = thread->log();
 217   if (log != NULL)  task->log_task_done(log);
 218   thread->set_task(NULL);
 219   task->set_code_handle(NULL);
 220   thread->set_env(NULL);
 221   if (task->is_blocking()) {
 222     MutexLocker notifier(task->lock(), thread);
 223     task->mark_complete();
 224     // Notify the waiting thread that the compilation has completed.
 225     task->lock()->notify_all();
 226   } else {
 227     task->mark_complete();
 228 
 229     // By convention, the compiling thread is responsible for
 230     // recycling a non-blocking CompileTask.
 231     CompileTask::free(task);
 232   }
 233 }
 234 
 235 /**
 236  * Add a CompileTask to a CompileQueue.
 237  */
 238 void CompileQueue::add(CompileTask* task) {
 239   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 240 
 241   task->set_next(NULL);
 242   task->set_prev(NULL);
 243 
 244   if (_last == NULL) {
 245     // The compile queue is empty.
 246     assert(_first == NULL, "queue is empty");
 247     _first = task;
 248     _last = task;
 249   } else {
 250     // Append the task to the queue.
 251     assert(_last->next() == NULL, "not last");
 252     _last->set_next(task);
 253     task->set_prev(_last);
 254     _last = task;
 255   }
 256   ++_size;
 257 
 258   // Mark the method as being in the compile queue.
 259   task->method()->set_queued_for_compilation();
 260 
 261   if (CIPrintCompileQueue) {
 262     print_tty();
 263   }
 264 
 265   if (LogCompilation && xtty != NULL) {
 266     task->log_task_queued();
 267   }
 268 
 269   // Notify CompilerThreads that a task is available.
 270   MethodCompileQueue_lock->notify_all();
 271 }
 272 
 273 /**
 274  * Empties compilation queue by putting all compilation tasks onto
 275  * a freelist. Furthermore, the method wakes up all threads that are
 276  * waiting on a compilation task to finish. This can happen if background
 277  * compilation is disabled.
 278  */
 279 void CompileQueue::free_all() {
 280   MutexLocker mu(MethodCompileQueue_lock);
 281   CompileTask* next = _first;
 282 
 283   // Iterate over all tasks in the compile queue
 284   while (next != NULL) {
 285     CompileTask* current = next;
 286     next = current->next();
 287     {
 288       // Wake up thread that blocks on the compile task.
 289       MutexLocker ct_lock(current->lock());
 290       current->lock()->notify();
 291     }
 292     // Put the task back on the freelist.
 293     CompileTask::free(current);
 294   }
 295   _first = NULL;
 296 
 297   // Wake up all threads that block on the queue.
 298   MethodCompileQueue_lock->notify_all();
 299 }
 300 
 301 /**
 302  * Get the next CompileTask from a CompileQueue
 303  */
 304 CompileTask* CompileQueue::get() {
 305   // save methods from RedefineClasses across safepoint
 306   // across MethodCompileQueue_lock below.
 307   methodHandle save_method;
 308   methodHandle save_hot_method;
 309 
 310   MutexLocker locker(MethodCompileQueue_lock);
 311   // If _first is NULL we have no more compile jobs. There are two reasons for
 312   // having no compile jobs: First, we compiled everything we wanted. Second,
 313   // we ran out of code cache so compilation has been disabled. In the latter
 314   // case we perform code cache sweeps to free memory such that we can re-enable
 315   // compilation.
 316   while (_first == NULL) {
 317     // Exit loop if compilation is disabled forever
 318     if (CompileBroker::is_compilation_disabled_forever()) {
 319       return NULL;
 320     }
 321 
 322     // If there are no compilation tasks and we can compile new jobs
 323     // (i.e., there is enough free space in the code cache) there is
 324     // no need to invoke the sweeper. As a result, the hotness of methods
 325     // remains unchanged. This behavior is desired, since we want to keep
 326     // the stable state, i.e., we do not want to evict methods from the
 327     // code cache if it is unnecessary.
 328     // We need a timed wait here, since compiler threads can exit if compilation
 329     // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 330     // is not critical and we do not want idle compiler threads to wake up too often.
 331     MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 332   }
 333 
 334   if (CompileBroker::is_compilation_disabled_forever()) {
 335     return NULL;
 336   }
 337 
 338   CompileTask* task;
 339   {
 340     No_Safepoint_Verifier nsv;
 341     task = CompilationPolicy::policy()->select_task(this);
 342   }
 343 
 344   // Save method pointers across unlock safepoint.  The task is removed from
 345   // the compilation queue, which is walked during RedefineClasses.
 346   save_method = methodHandle(task->method());
 347   save_hot_method = methodHandle(task->hot_method());
 348 
 349   remove(task);
 350   purge_stale_tasks(); // may temporarily release MCQ lock
 351   return task;
 352 }
 353 
 354 // Clean & deallocate stale compile tasks.
 355 // Temporarily releases MethodCompileQueue lock.
 356 void CompileQueue::purge_stale_tasks() {
 357   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 358   if (_first_stale != NULL) {
 359     // Stale tasks are purged when MCQ lock is released,
 360     // but _first_stale updates are protected by MCQ lock.
 361     // Once task processing starts and MCQ lock is released,
 362     // other compiler threads can reuse _first_stale.
 363     CompileTask* head = _first_stale;
 364     _first_stale = NULL;
 365     {
 366       MutexUnlocker ul(MethodCompileQueue_lock);
 367       for (CompileTask* task = head; task != NULL; ) {
 368         CompileTask* next_task = task->next();
 369         CompileTaskWrapper ctw(task); // Frees the task
 370         task->set_failure_reason("stale task");
 371         task = next_task;
 372       }
 373     }
 374   }
 375 }
 376 
 377 void CompileQueue::remove(CompileTask* task) {
 378    assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 379   if (task->prev() != NULL) {
 380     task->prev()->set_next(task->next());
 381   } else {
 382     // max is the first element
 383     assert(task == _first, "Sanity");
 384     _first = task->next();
 385   }
 386 
 387   if (task->next() != NULL) {
 388     task->next()->set_prev(task->prev());
 389   } else {
 390     // max is the last element
 391     assert(task == _last, "Sanity");
 392     _last = task->prev();
 393   }
 394   --_size;
 395 }
 396 
 397 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 398   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 399   remove(task);
 400 
 401   // Enqueue the task for reclamation (should be done outside MCQ lock)
 402   task->set_next(_first_stale);
 403   task->set_prev(NULL);
 404   _first_stale = task;
 405 }
 406 
 407 // methods in the compile queue need to be marked as used on the stack
 408 // so that they don't get reclaimed by Redefine Classes
 409 void CompileQueue::mark_on_stack() {
 410   CompileTask* task = _first;
 411   while (task != NULL) {
 412     task->mark_on_stack();
 413     task = task->next();
 414   }
 415 }
 416 
 417 
 418 CompileQueue* CompileBroker::compile_queue(int comp_level) {
 419   if (is_c2_compile(comp_level)) return _c2_compile_queue;
 420   if (is_c1_compile(comp_level)) return _c1_compile_queue;
 421   return NULL;
 422 }
 423 
 424 
 425 void CompileBroker::print_compile_queues(outputStream* st) {
 426   MutexLocker locker(MethodCompileQueue_lock);
 427   if (_c1_compile_queue != NULL) {
 428     _c1_compile_queue->print(st);
 429   }
 430   if (_c2_compile_queue != NULL) {
 431     _c2_compile_queue->print(st);
 432   }
 433 }
 434 
 435 void CompileQueue::print(outputStream* st) {
 436   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 437   st->print_cr("Contents of %s", name());
 438   st->print_cr("----------------------------");
 439   CompileTask* task = _first;
 440   if (task == NULL) {
 441     st->print_cr("Empty");
 442   } else {
 443     while (task != NULL) {
 444       task->print(st, NULL, true, true);
 445       task = task->next();
 446     }
 447   }
 448   st->print_cr("----------------------------");
 449 }
 450 
 451 void CompileQueue::print_tty() {
 452   ttyLocker ttyl;
 453   print(tty);
 454 }
 455 
 456 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 457 
 458   _current_method[0] = '\0';
 459   _compile_type = CompileBroker::no_compile;
 460 
 461   if (UsePerfData) {
 462     ResourceMark rm;
 463 
 464     // create the thread instance name space string - don't create an
 465     // instance subspace if instance is -1 - keeps the adapterThread
 466     // counters  from having a ".0" namespace.
 467     const char* thread_i = (instance == -1) ? thread_name :
 468                       PerfDataManager::name_space(thread_name, instance);
 469 
 470 
 471     char* name = PerfDataManager::counter_name(thread_i, "method");
 472     _perf_current_method =
 473                PerfDataManager::create_string_variable(SUN_CI, name,
 474                                                        cmname_buffer_length,
 475                                                        _current_method, CHECK);
 476 
 477     name = PerfDataManager::counter_name(thread_i, "type");
 478     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 479                                                           PerfData::U_None,
 480                                                          (jlong)_compile_type,
 481                                                           CHECK);
 482 
 483     name = PerfDataManager::counter_name(thread_i, "time");
 484     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 485                                                  PerfData::U_Ticks, CHECK);
 486 
 487     name = PerfDataManager::counter_name(thread_i, "compiles");
 488     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 489                                                      PerfData::U_Events, CHECK);
 490   }
 491 }
 492 
 493 // ------------------------------------------------------------------
 494 // CompileBroker::compilation_init
 495 //
 496 // Initialize the Compilation object
 497 void CompileBroker::compilation_init() {
 498   _last_method_compiled[0] = '\0';
 499 
 500   // No need to initialize compilation system if we do not use it.
 501   if (!UseCompiler) {
 502     return;
 503   }
 504 #ifndef SHARK
 505   // Set the interface to the current compiler(s).
 506   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 507   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 508 #ifdef COMPILER1
 509   if (c1_count > 0) {
 510     _compilers[0] = new Compiler();
 511   }
 512 #endif // COMPILER1
 513 
 514 #ifdef COMPILER2
 515   if (c2_count > 0) {
 516     _compilers[1] = new C2Compiler();
 517   }
 518 #endif // COMPILER2
 519 
 520 #else // SHARK
 521   int c1_count = 0;
 522   int c2_count = 1;
 523 
 524   _compilers[1] = new SharkCompiler();
 525 #endif // SHARK
 526 
 527   // Start the compiler thread(s) and the sweeper thread
 528   init_compiler_sweeper_threads(c1_count, c2_count);
 529   // totalTime performance counter is always created as it is required
 530   // by the implementation of java.lang.management.CompilationMBean.
 531   {
 532     EXCEPTION_MARK;
 533     _perf_total_compilation =
 534                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 535                                                  PerfData::U_Ticks, CHECK);
 536   }
 537 
 538 
 539   if (UsePerfData) {
 540 
 541     EXCEPTION_MARK;
 542 
 543     // create the jvmstat performance counters
 544     _perf_osr_compilation =
 545                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 546                                                  PerfData::U_Ticks, CHECK);
 547 
 548     _perf_standard_compilation =
 549                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 550                                                  PerfData::U_Ticks, CHECK);
 551 
 552     _perf_total_bailout_count =
 553                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 554                                                  PerfData::U_Events, CHECK);
 555 
 556     _perf_total_invalidated_count =
 557                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 558                                                  PerfData::U_Events, CHECK);
 559 
 560     _perf_total_compile_count =
 561                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 562                                                  PerfData::U_Events, CHECK);
 563     _perf_total_osr_compile_count =
 564                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 565                                                  PerfData::U_Events, CHECK);
 566 
 567     _perf_total_standard_compile_count =
 568                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 569                                                  PerfData::U_Events, CHECK);
 570 
 571     _perf_sum_osr_bytes_compiled =
 572                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 573                                                  PerfData::U_Bytes, CHECK);
 574 
 575     _perf_sum_standard_bytes_compiled =
 576                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 577                                                  PerfData::U_Bytes, CHECK);
 578 
 579     _perf_sum_nmethod_size =
 580                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 581                                                  PerfData::U_Bytes, CHECK);
 582 
 583     _perf_sum_nmethod_code_size =
 584                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 585                                                  PerfData::U_Bytes, CHECK);
 586 
 587     _perf_last_method =
 588                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 589                                        CompilerCounters::cmname_buffer_length,
 590                                        "", CHECK);
 591 
 592     _perf_last_failed_method =
 593             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 594                                        CompilerCounters::cmname_buffer_length,
 595                                        "", CHECK);
 596 
 597     _perf_last_invalidated_method =
 598         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 599                                      CompilerCounters::cmname_buffer_length,
 600                                      "", CHECK);
 601 
 602     _perf_last_compile_type =
 603              PerfDataManager::create_variable(SUN_CI, "lastType",
 604                                               PerfData::U_None,
 605                                               (jlong)CompileBroker::no_compile,
 606                                               CHECK);
 607 
 608     _perf_last_compile_size =
 609              PerfDataManager::create_variable(SUN_CI, "lastSize",
 610                                               PerfData::U_Bytes,
 611                                               (jlong)CompileBroker::no_compile,
 612                                               CHECK);
 613 
 614 
 615     _perf_last_failed_type =
 616              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 617                                               PerfData::U_None,
 618                                               (jlong)CompileBroker::no_compile,
 619                                               CHECK);
 620 
 621     _perf_last_invalidated_type =
 622          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 623                                           PerfData::U_None,
 624                                           (jlong)CompileBroker::no_compile,
 625                                           CHECK);
 626   }
 627 
 628   _initialized = true;
 629 }
 630 
 631 
 632 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
 633                                        AbstractCompiler* comp, bool compiler_thread, TRAPS) {
 634   JavaThread* thread = NULL;
 635   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
 636   instanceKlassHandle klass (THREAD, k);
 637   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 638   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 639 
 640   // Initialize thread_oop to put it into the system threadGroup
 641   Handle thread_group (THREAD,  Universe::system_thread_group());
 642   JavaValue result(T_VOID);
 643   JavaCalls::call_special(&result, thread_oop,
 644                        klass,
 645                        vmSymbols::object_initializer_name(),
 646                        vmSymbols::threadgroup_string_void_signature(),
 647                        thread_group,
 648                        string,
 649                        CHECK_0);
 650 
 651   {
 652     MutexLocker mu(Threads_lock, THREAD);
 653     if (compiler_thread) {
 654       thread = new CompilerThread(queue, counters);
 655     } else {
 656       thread = new CodeCacheSweeperThread();
 657     }
 658     // At this point the new CompilerThread data-races with this startup
 659     // thread (which I believe is the primoridal thread and NOT the VM
 660     // thread).  This means Java bytecodes being executed at startup can
 661     // queue compile jobs which will run at whatever default priority the
 662     // newly created CompilerThread runs at.
 663 
 664 
 665     // At this point it may be possible that no osthread was created for the
 666     // JavaThread due to lack of memory. We would have to throw an exception
 667     // in that case. However, since this must work and we do not allow
 668     // exceptions anyway, check and abort if this fails.
 669 
 670     if (thread == NULL || thread->osthread() == NULL) {
 671       vm_exit_during_initialization("java.lang.OutOfMemoryError",
 672                                     os::native_thread_creation_failed_msg());
 673     }
 674 
 675     java_lang_Thread::set_thread(thread_oop(), thread);
 676 
 677     // Note that this only sets the JavaThread _priority field, which by
 678     // definition is limited to Java priorities and not OS priorities.
 679     // The os-priority is set in the CompilerThread startup code itself
 680 
 681     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
 682 
 683     // Note that we cannot call os::set_priority because it expects Java
 684     // priorities and we are *explicitly* using OS priorities so that it's
 685     // possible to set the compiler thread priority higher than any Java
 686     // thread.
 687 
 688     int native_prio = CompilerThreadPriority;
 689     if (native_prio == -1) {
 690       if (UseCriticalCompilerThreadPriority) {
 691         native_prio = os::java_to_os_priority[CriticalPriority];
 692       } else {
 693         native_prio = os::java_to_os_priority[NearMaxPriority];
 694       }
 695     }
 696     os::set_native_priority(thread, native_prio);
 697 
 698     java_lang_Thread::set_daemon(thread_oop());
 699 
 700     thread->set_threadObj(thread_oop());
 701     if (compiler_thread) {
 702       thread->as_CompilerThread()->set_compiler(comp);
 703     }
 704     Threads::add(thread);
 705     Thread::start(thread);
 706   }
 707 
 708   // Let go of Threads_lock before yielding
 709   os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 710 
 711   return thread;
 712 }
 713 
 714 
 715 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
 716   EXCEPTION_MARK;
 717 #if !defined(ZERO) && !defined(SHARK)
 718   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
 719 #endif // !ZERO && !SHARK
 720   // Initialize the compilation queue
 721   if (c2_compiler_count > 0) {
 722     _c2_compile_queue  = new CompileQueue("C2 compile queue");
 723     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
 724   }
 725   if (c1_compiler_count > 0) {
 726     _c1_compile_queue  = new CompileQueue("C1 compile queue");
 727     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
 728   }
 729 
 730   int compiler_count = c1_compiler_count + c2_compiler_count;
 731 
 732   char name_buffer[256];
 733   const bool compiler_thread = true;
 734   for (int i = 0; i < c2_compiler_count; i++) {
 735     // Create a name for our thread.
 736     sprintf(name_buffer, "C2 CompilerThread%d", i);
 737     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 738     // Shark and C2
 739     make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
 740   }
 741 
 742   for (int i = c2_compiler_count; i < compiler_count; i++) {
 743     // Create a name for our thread.
 744     sprintf(name_buffer, "C1 CompilerThread%d", i);
 745     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 746     // C1
 747     make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
 748   }
 749 
 750   if (UsePerfData) {
 751     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
 752   }
 753 
 754   if (MethodFlushing) {
 755     // Initialize the sweeper thread
 756     make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
 757   }
 758 }
 759 
 760 
 761 /**
 762  * Set the methods on the stack as on_stack so that redefine classes doesn't
 763  * reclaim them. This method is executed at a safepoint.
 764  */
 765 void CompileBroker::mark_on_stack() {
 766   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
 767   // Since we are at a safepoint, we do not need a lock to access
 768   // the compile queues.
 769   if (_c2_compile_queue != NULL) {
 770     _c2_compile_queue->mark_on_stack();
 771   }
 772   if (_c1_compile_queue != NULL) {
 773     _c1_compile_queue->mark_on_stack();
 774   }
 775 }
 776 
 777 // ------------------------------------------------------------------
 778 // CompileBroker::compile_method
 779 //
 780 // Request compilation of a method.
 781 void CompileBroker::compile_method_base(methodHandle method,
 782                                         int osr_bci,
 783                                         int comp_level,
 784                                         methodHandle hot_method,
 785                                         int hot_count,
 786                                         const char* comment,
 787                                         Thread* thread) {
 788   // do nothing if compiler thread(s) is not available
 789   if (!_initialized) {
 790     return;
 791   }
 792 
 793   guarantee(!method->is_abstract(), "cannot compile abstract methods");
 794   assert(method->method_holder()->oop_is_instance(),
 795          "sanity check");
 796   assert(!method->method_holder()->is_not_initialized(),
 797          "method holder must be initialized");
 798   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
 799 
 800   if (CIPrintRequests) {
 801     tty->print("request: ");
 802     method->print_short_name(tty);
 803     if (osr_bci != InvocationEntryBci) {
 804       tty->print(" osr_bci: %d", osr_bci);
 805     }
 806     tty->print(" comment: %s count: %d", comment, hot_count);
 807     if (!hot_method.is_null()) {
 808       tty->print(" hot: ");
 809       if (hot_method() != method()) {
 810           hot_method->print_short_name(tty);
 811       } else {
 812         tty->print("yes");
 813       }
 814     }
 815     tty->cr();
 816   }
 817 
 818   // A request has been made for compilation.  Before we do any
 819   // real work, check to see if the method has been compiled
 820   // in the meantime with a definitive result.
 821   if (compilation_is_complete(method, osr_bci, comp_level)) {
 822     return;
 823   }
 824 
 825 #ifndef PRODUCT
 826   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
 827     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
 828       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
 829       return;
 830     }
 831   }
 832 #endif
 833 
 834   // If this method is already in the compile queue, then
 835   // we do not block the current thread.
 836   if (compilation_is_in_queue(method)) {
 837     // We may want to decay our counter a bit here to prevent
 838     // multiple denied requests for compilation.  This is an
 839     // open compilation policy issue. Note: The other possibility,
 840     // in the case that this is a blocking compile request, is to have
 841     // all subsequent blocking requesters wait for completion of
 842     // ongoing compiles. Note that in this case we'll need a protocol
 843     // for freeing the associated compile tasks. [Or we could have
 844     // a single static monitor on which all these waiters sleep.]
 845     return;
 846   }
 847 
 848   // If the requesting thread is holding the pending list lock
 849   // then we just return. We can't risk blocking while holding
 850   // the pending list lock or a 3-way deadlock may occur
 851   // between the reference handler thread, a GC (instigated
 852   // by a compiler thread), and compiled method registration.
 853   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
 854     return;
 855   }
 856 
 857   if (TieredCompilation) {
 858     // Tiered policy requires MethodCounters to exist before adding a method to
 859     // the queue. Create if we don't have them yet.
 860     method->get_method_counters(thread);
 861   }
 862 
 863   // Outputs from the following MutexLocker block:
 864   CompileTask* task     = NULL;
 865   bool         blocking = false;
 866   CompileQueue* queue  = compile_queue(comp_level);
 867 
 868   // Acquire our lock.
 869   {
 870     MutexLocker locker(MethodCompileQueue_lock, thread);
 871 
 872     // Make sure the method has not slipped into the queues since
 873     // last we checked; note that those checks were "fast bail-outs".
 874     // Here we need to be more careful, see 14012000 below.
 875     if (compilation_is_in_queue(method)) {
 876       return;
 877     }
 878 
 879     // We need to check again to see if the compilation has
 880     // completed.  A previous compilation may have registered
 881     // some result.
 882     if (compilation_is_complete(method, osr_bci, comp_level)) {
 883       return;
 884     }
 885 
 886     // We now know that this compilation is not pending, complete,
 887     // or prohibited.  Assign a compile_id to this compilation
 888     // and check to see if it is in our [Start..Stop) range.
 889     int compile_id = assign_compile_id(method, osr_bci);
 890     if (compile_id == 0) {
 891       // The compilation falls outside the allowed range.
 892       return;
 893     }
 894 
 895     // Should this thread wait for completion of the compile?
 896     blocking = is_compile_blocking();
 897 
 898     // We will enter the compilation in the queue.
 899     // 14012000: Note that this sets the queued_for_compile bits in
 900     // the target method. We can now reason that a method cannot be
 901     // queued for compilation more than once, as follows:
 902     // Before a thread queues a task for compilation, it first acquires
 903     // the compile queue lock, then checks if the method's queued bits
 904     // are set or it has already been compiled. Thus there can not be two
 905     // instances of a compilation task for the same method on the
 906     // compilation queue. Consider now the case where the compilation
 907     // thread has already removed a task for that method from the queue
 908     // and is in the midst of compiling it. In this case, the
 909     // queued_for_compile bits must be set in the method (and these
 910     // will be visible to the current thread, since the bits were set
 911     // under protection of the compile queue lock, which we hold now.
 912     // When the compilation completes, the compiler thread first sets
 913     // the compilation result and then clears the queued_for_compile
 914     // bits. Neither of these actions are protected by a barrier (or done
 915     // under the protection of a lock), so the only guarantee we have
 916     // (on machines with TSO (Total Store Order)) is that these values
 917     // will update in that order. As a result, the only combinations of
 918     // these bits that the current thread will see are, in temporal order:
 919     // <RESULT, QUEUE> :
 920     //     <0, 1> : in compile queue, but not yet compiled
 921     //     <1, 1> : compiled but queue bit not cleared
 922     //     <1, 0> : compiled and queue bit cleared
 923     // Because we first check the queue bits then check the result bits,
 924     // we are assured that we cannot introduce a duplicate task.
 925     // Note that if we did the tests in the reverse order (i.e. check
 926     // result then check queued bit), we could get the result bit before
 927     // the compilation completed, and the queue bit after the compilation
 928     // completed, and end up introducing a "duplicate" (redundant) task.
 929     // In that case, the compiler thread should first check if a method
 930     // has already been compiled before trying to compile it.
 931     // NOTE: in the event that there are multiple compiler threads and
 932     // there is de-optimization/recompilation, things will get hairy,
 933     // and in that case it's best to protect both the testing (here) of
 934     // these bits, and their updating (here and elsewhere) under a
 935     // common lock.
 936     task = create_compile_task(queue,
 937                                compile_id, method,
 938                                osr_bci, comp_level,
 939                                hot_method, hot_count, comment,
 940                                blocking);
 941   }
 942 
 943   if (blocking) {
 944     wait_for_completion(task);
 945   }
 946 }
 947 
 948 
 949 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
 950                                        int comp_level,
 951                                        methodHandle hot_method, int hot_count,
 952                                        const char* comment, Thread* THREAD) {
 953   // make sure arguments make sense
 954   assert(method->method_holder()->oop_is_instance(), "not an instance method");
 955   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
 956   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
 957   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
 958   // allow any levels for WhiteBox
 959   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
 960   // return quickly if possible
 961 
 962   // lock, make sure that the compilation
 963   // isn't prohibited in a straightforward way.
 964   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
 965   if (comp == NULL || !comp->can_compile_method(method) ||
 966       compilation_is_prohibited(method, osr_bci, comp_level)) {
 967     return NULL;
 968   }
 969 
 970   if (osr_bci == InvocationEntryBci) {
 971     // standard compilation
 972     nmethod* method_code = method->code();
 973     if (method_code != NULL) {
 974       if (compilation_is_complete(method, osr_bci, comp_level)) {
 975         return method_code;
 976       }
 977     }
 978     if (method->is_not_compilable(comp_level)) {
 979       return NULL;
 980     }
 981   } else {
 982     // osr compilation
 983 #ifndef TIERED
 984     // seems like an assert of dubious value
 985     assert(comp_level == CompLevel_highest_tier,
 986            "all OSR compiles are assumed to be at a single compilation level");
 987 #endif // TIERED
 988     // We accept a higher level osr method
 989     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
 990     if (nm != NULL) return nm;
 991     if (method->is_not_osr_compilable(comp_level)) return NULL;
 992   }
 993 
 994   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
 995   // some prerequisites that are compiler specific
 996   if (comp->is_c2() || comp->is_shark()) {
 997     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
 998     // Resolve all classes seen in the signature of the method
 999     // we are compiling.
1000     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1001   }
1002 
1003   // If the method is native, do the lookup in the thread requesting
1004   // the compilation. Native lookups can load code, which is not
1005   // permitted during compilation.
1006   //
1007   // Note: A native method implies non-osr compilation which is
1008   //       checked with an assertion at the entry of this method.
1009   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1010     bool in_base_library;
1011     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1012     if (HAS_PENDING_EXCEPTION) {
1013       // In case of an exception looking up the method, we just forget
1014       // about it. The interpreter will kick-in and throw the exception.
1015       method->set_not_compilable(); // implies is_not_osr_compilable()
1016       CLEAR_PENDING_EXCEPTION;
1017       return NULL;
1018     }
1019     assert(method->has_native_function(), "must have native code by now");
1020   }
1021 
1022   // RedefineClasses() has replaced this method; just return
1023   if (method->is_old()) {
1024     return NULL;
1025   }
1026 
1027   // JVMTI -- post_compile_event requires jmethod_id() that may require
1028   // a lock the compiling thread can not acquire. Prefetch it here.
1029   if (JvmtiExport::should_post_compiled_method_load()) {
1030     method->jmethod_id();
1031   }
1032 
1033   // do the compilation
1034   if (method->is_native()) {
1035     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1036       // The following native methods:
1037       //
1038       // java.lang.Float.intBitsToFloat
1039       // java.lang.Float.floatToRawIntBits
1040       // java.lang.Double.longBitsToDouble
1041       // java.lang.Double.doubleToRawLongBits
1042       //
1043       // are called through the interpreter even if interpreter native stubs
1044       // are not preferred (i.e., calling through adapter handlers is preferred).
1045       // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1046       // if the version of the methods from the native libraries is called.
1047       // As the interpreter and the C2-intrinsified version of the methods preserves
1048       // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1049       if ((UseSSE >= 1 &&
1050           (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1051            method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1052           (UseSSE >= 2 &&
1053            (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1054             method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1055         return NULL;
1056       }
1057 
1058       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1059       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1060       //
1061       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1062       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1063       AdapterHandlerLibrary::create_native_wrapper(method);
1064     } else {
1065       return NULL;
1066     }
1067   } else {
1068     // If the compiler is shut off due to code cache getting full
1069     // fail out now so blocking compiles dont hang the java thread
1070     if (!should_compile_new_jobs()) {
1071       CompilationPolicy::policy()->delay_compilation(method());
1072       return NULL;
1073     }
1074     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1075   }
1076 
1077   // return requested nmethod
1078   // We accept a higher level osr method
1079   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1080 }
1081 
1082 
1083 // ------------------------------------------------------------------
1084 // CompileBroker::compilation_is_complete
1085 //
1086 // See if compilation of this method is already complete.
1087 bool CompileBroker::compilation_is_complete(methodHandle method,
1088                                             int          osr_bci,
1089                                             int          comp_level) {
1090   bool is_osr = (osr_bci != standard_entry_bci);
1091   if (is_osr) {
1092     if (method->is_not_osr_compilable(comp_level)) {
1093       return true;
1094     } else {
1095       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1096       return (result != NULL);
1097     }
1098   } else {
1099     if (method->is_not_compilable(comp_level)) {
1100       return true;
1101     } else {
1102       nmethod* result = method->code();
1103       if (result == NULL) return false;
1104       return comp_level == result->comp_level();
1105     }
1106   }
1107 }
1108 
1109 
1110 /**
1111  * See if this compilation is already requested.
1112  *
1113  * Implementation note: there is only a single "is in queue" bit
1114  * for each method.  This means that the check below is overly
1115  * conservative in the sense that an osr compilation in the queue
1116  * will block a normal compilation from entering the queue (and vice
1117  * versa).  This can be remedied by a full queue search to disambiguate
1118  * cases.  If it is deemed profitable, this may be done.
1119  */
1120 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1121   return method->queued_for_compilation();
1122 }
1123 
1124 // ------------------------------------------------------------------
1125 // CompileBroker::compilation_is_prohibited
1126 //
1127 // See if this compilation is not allowed.
1128 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1129   bool is_native = method->is_native();
1130   // Some compilers may not support the compilation of natives.
1131   AbstractCompiler *comp = compiler(comp_level);
1132   if (is_native &&
1133       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1134     method->set_not_compilable_quietly(comp_level);
1135     return true;
1136   }
1137 
1138   bool is_osr = (osr_bci != standard_entry_bci);
1139   // Some compilers may not support on stack replacement.
1140   if (is_osr &&
1141       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1142     method->set_not_osr_compilable(comp_level);
1143     return true;
1144   }
1145 








1146   // The method may be explicitly excluded by the user.
1147   bool quietly;
1148   double scale;
1149   if (CompilerOracle::should_exclude(method, quietly)
1150       || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1151     if (!quietly) {
1152       // This does not happen quietly...
1153       ResourceMark rm;
1154       tty->print("### Excluding %s:%s",
1155                  method->is_native() ? "generation of native wrapper" : "compile",
1156                  (method->is_static() ? " static" : ""));
1157       method->print_short_name(tty);
1158       tty->cr();
1159     }
1160     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompileCommand");
1161   }
1162 
1163   return false;
1164 }
1165 
1166 /**
1167  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1168  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1169  * The function also allows to generate separate compilation IDs for OSR compilations.
1170  */
1171 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1172 #ifdef ASSERT
1173   bool is_osr = (osr_bci != standard_entry_bci);
1174   int id;
1175   if (method->is_native()) {
1176     assert(!is_osr, "can't be osr");
1177     // Adapters, native wrappers and method handle intrinsics
1178     // should be generated always.
1179     return Atomic::add(1, &_compilation_id);
1180   } else if (CICountOSR && is_osr) {
1181     id = Atomic::add(1, &_osr_compilation_id);
1182     if (CIStartOSR <= id && id < CIStopOSR) {
1183       return id;
1184     }
1185   } else {
1186     id = Atomic::add(1, &_compilation_id);
1187     if (CIStart <= id && id < CIStop) {
1188       return id;
1189     }
1190   }
1191 
1192   // Method was not in the appropriate compilation range.
1193   method->set_not_compilable_quietly();
1194   return 0;
1195 #else
1196   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1197   // only _compilation_id is incremented.
1198   return Atomic::add(1, &_compilation_id);
1199 #endif
1200 }
1201 
1202 /**
1203  * Should the current thread block until this compilation request
1204  * has been fulfilled?
1205  */
1206 bool CompileBroker::is_compile_blocking() {
1207   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1208   return !BackgroundCompilation;
1209 }
1210 
1211 
1212 // ------------------------------------------------------------------
1213 // CompileBroker::preload_classes
1214 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1215   // Move this code over from c1_Compiler.cpp
1216   ShouldNotReachHere();
1217 }
1218 
1219 
1220 // ------------------------------------------------------------------
1221 // CompileBroker::create_compile_task
1222 //
1223 // Create a CompileTask object representing the current request for
1224 // compilation.  Add this task to the queue.
1225 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1226                                               int           compile_id,
1227                                               methodHandle  method,
1228                                               int           osr_bci,
1229                                               int           comp_level,
1230                                               methodHandle  hot_method,
1231                                               int           hot_count,
1232                                               const char*   comment,
1233                                               bool          blocking) {
1234   CompileTask* new_task = CompileTask::allocate();
1235   new_task->initialize(compile_id, method, osr_bci, comp_level,
1236                        hot_method, hot_count, comment,
1237                        blocking);
1238   queue->add(new_task);
1239   return new_task;
1240 }
1241 
1242 
1243 /**
1244  *  Wait for the compilation task to complete.
1245  */
1246 void CompileBroker::wait_for_completion(CompileTask* task) {
1247   if (CIPrintCompileQueue) {
1248     ttyLocker ttyl;
1249     tty->print_cr("BLOCKING FOR COMPILE");
1250   }
1251 
1252   assert(task->is_blocking(), "can only wait on blocking task");
1253 
1254   JavaThread* thread = JavaThread::current();
1255   thread->set_blocked_on_compilation(true);
1256 
1257   methodHandle method(thread, task->method());
1258   {
1259     MutexLocker waiter(task->lock(), thread);
1260 
1261     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1262       task->lock()->wait();
1263     }
1264   }
1265 
1266   thread->set_blocked_on_compilation(false);
1267   if (is_compilation_disabled_forever()) {
1268     CompileTask::free(task);
1269     return;
1270   }
1271 
1272   // It is harmless to check this status without the lock, because
1273   // completion is a stable property (until the task object is recycled).
1274   assert(task->is_complete(), "Compilation should have completed");
1275   assert(task->code_handle() == NULL, "must be reset");
1276 
1277   // By convention, the waiter is responsible for recycling a
1278   // blocking CompileTask. Since there is only one waiter ever
1279   // waiting on a CompileTask, we know that no one else will
1280   // be using this CompileTask; we can free it.
1281   CompileTask::free(task);
1282 }
1283 
1284 /**
1285  * Initialize compiler thread(s) + compiler object(s). The postcondition
1286  * of this function is that the compiler runtimes are initialized and that
1287  * compiler threads can start compiling.
1288  */
1289 bool CompileBroker::init_compiler_runtime() {
1290   CompilerThread* thread = CompilerThread::current();
1291   AbstractCompiler* comp = thread->compiler();
1292   // Final sanity check - the compiler object must exist
1293   guarantee(comp != NULL, "Compiler object must exist");
1294 
1295   int system_dictionary_modification_counter;
1296   {
1297     MutexLocker locker(Compile_lock, thread);
1298     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1299   }
1300 
1301   {



1302     // Must switch to native to allocate ci_env
1303     ThreadToNativeFromVM ttn(thread);
1304     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1305     // Cache Jvmti state
1306     ci_env.cache_jvmti_state();
1307     // Cache DTrace flags
1308     ci_env.cache_dtrace_flags();
1309 
1310     // Switch back to VM state to do compiler initialization
1311     ThreadInVMfromNative tv(thread);
1312     ResetNoHandleMark rnhm;
1313 
1314 
1315     if (!comp->is_shark()) {
1316       // Perform per-thread and global initializations
1317       comp->initialize();
1318     }
1319   }
1320 
1321   if (comp->is_failed()) {
1322     disable_compilation_forever();
1323     // If compiler initialization failed, no compiler thread that is specific to a
1324     // particular compiler runtime will ever start to compile methods.
1325     shutdown_compiler_runtime(comp, thread);
1326     return false;
1327   }
1328 
1329   // C1 specific check
1330   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1331     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1332     return false;
1333   }
1334 
1335   return true;
1336 }
1337 
1338 /**
1339  * If C1 and/or C2 initialization failed, we shut down all compilation.
1340  * We do this to keep things simple. This can be changed if it ever turns
1341  * out to be a problem.
1342  */
1343 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1344   // Free buffer blob, if allocated
1345   if (thread->get_buffer_blob() != NULL) {
1346     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1347     CodeCache::free(thread->get_buffer_blob());
1348   }
1349 
1350   if (comp->should_perform_shutdown()) {
1351     // There are two reasons for shutting down the compiler
1352     // 1) compiler runtime initialization failed
1353     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1354     warning("%s initialization failed. Shutting down all compilers", comp->name());
1355 
1356     // Only one thread per compiler runtime object enters here
1357     // Set state to shut down
1358     comp->set_shut_down();
1359 
1360     // Delete all queued compilation tasks to make compiler threads exit faster.
1361     if (_c1_compile_queue != NULL) {
1362       _c1_compile_queue->free_all();
1363     }
1364 
1365     if (_c2_compile_queue != NULL) {
1366       _c2_compile_queue->free_all();
1367     }
1368 
1369     // Set flags so that we continue execution with using interpreter only.
1370     UseCompiler    = false;
1371     UseInterpreter = true;
1372 
1373     // We could delete compiler runtimes also. However, there are references to
1374     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1375     // fail. This can be done later if necessary.
1376   }
1377 }
1378 
1379 // ------------------------------------------------------------------
1380 // CompileBroker::compiler_thread_loop
1381 //
1382 // The main loop run by a CompilerThread.
1383 void CompileBroker::compiler_thread_loop() {
1384   CompilerThread* thread = CompilerThread::current();
1385   CompileQueue* queue = thread->queue();
1386   // For the thread that initializes the ciObjectFactory
1387   // this resource mark holds all the shared objects
1388   ResourceMark rm;
1389 
1390   // First thread to get here will initialize the compiler interface
1391 
1392   if (!ciObjectFactory::is_initialized()) {
1393     ASSERT_IN_VM;
1394     MutexLocker only_one (CompileThread_lock, thread);
1395     if (!ciObjectFactory::is_initialized()) {
1396       ciObjectFactory::initialize();
1397     }
1398   }
1399 
1400   // Open a log.
1401   if (LogCompilation) {
1402     init_compiler_thread_log();
1403   }
1404   CompileLog* log = thread->log();
1405   if (log != NULL) {
1406     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1407                     thread->name(),
1408                     os::current_thread_id(),
1409                     os::current_process_id());
1410     log->stamp();
1411     log->end_elem();
1412   }
1413 
1414   // If compiler thread/runtime initialization fails, exit the compiler thread
1415   if (!init_compiler_runtime()) {
1416     return;
1417   }
1418 
1419   // Poll for new compilation tasks as long as the JVM runs. Compilation
1420   // should only be disabled if something went wrong while initializing the
1421   // compiler runtimes. This, in turn, should not happen. The only known case
1422   // when compiler runtime initialization fails is if there is not enough free
1423   // space in the code cache to generate the necessary stubs, etc.
1424   while (!is_compilation_disabled_forever()) {
1425     // We need this HandleMark to avoid leaking VM handles.
1426     HandleMark hm(thread);
1427 
1428     CompileTask* task = queue->get();
1429     if (task == NULL) {
1430       continue;
1431     }
1432 
1433     // Give compiler threads an extra quanta.  They tend to be bursty and
1434     // this helps the compiler to finish up the job.
1435     if (CompilerThreadHintNoPreempt) {
1436       os::hint_no_preempt();
1437     }
1438 
1439     // trace per thread time and compile statistics
1440     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1441     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1442 
1443     // Assign the task to the current thread.  Mark this compilation
1444     // thread as active for the profiler.
1445     CompileTaskWrapper ctw(task);
1446     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1447     task->set_code_handle(&result_handle);
1448     methodHandle method(thread, task->method());
1449 
1450     // Never compile a method if breakpoints are present in it
1451     if (method()->number_of_breakpoints() == 0) {
1452       // Compile the method.
1453       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1454         invoke_compiler_on_method(task);
1455       } else {
1456         // After compilation is disabled, remove remaining methods from queue
1457         method->clear_queued_for_compilation();
1458         task->set_failure_reason("compilation is disabled");
1459       }
1460     }
1461   }
1462 
1463   // Shut down compiler runtime
1464   shutdown_compiler_runtime(thread->compiler(), thread);
1465 }
1466 
1467 // ------------------------------------------------------------------
1468 // CompileBroker::init_compiler_thread_log
1469 //
1470 // Set up state required by +LogCompilation.
1471 void CompileBroker::init_compiler_thread_log() {
1472     CompilerThread* thread = CompilerThread::current();
1473     char  file_name[4*K];
1474     FILE* fp = NULL;
1475     intx thread_id = os::current_thread_id();
1476     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1477       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1478       if (dir == NULL) {
1479         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1480                      thread_id, os::current_process_id());
1481       } else {
1482         jio_snprintf(file_name, sizeof(file_name),
1483                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1484                      os::file_separator(), thread_id, os::current_process_id());
1485       }
1486 
1487       fp = fopen(file_name, "wt");
1488       if (fp != NULL) {
1489         if (LogCompilation && Verbose) {
1490           tty->print_cr("Opening compilation log %s", file_name);
1491         }
1492         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1493         thread->init_log(log);
1494 
1495         if (xtty != NULL) {
1496           ttyLocker ttyl;
1497           // Record any per thread log files
1498           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1499         }
1500         return;
1501       }
1502     }
1503     warning("Cannot open log file: %s", file_name);
1504 }
1505 
1506 void CompileBroker::log_metaspace_failure() {
1507   const char* message = "some methods may not be compiled because metaspace "
1508                         "is out of memory";
1509   if (_compilation_log != NULL) {
1510     _compilation_log->log_metaspace_failure(message);
1511   }
1512   if (PrintCompilation) {
1513     tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1514   }
1515 }
1516 
1517 
1518 // ------------------------------------------------------------------
1519 // CompileBroker::set_should_block
1520 //
1521 // Set _should_block.
1522 // Call this from the VM, with Threads_lock held and a safepoint requested.
1523 void CompileBroker::set_should_block() {
1524   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1525   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1526 #ifndef PRODUCT
1527   if (PrintCompilation && (Verbose || WizardMode))
1528     tty->print_cr("notifying compiler thread pool to block");
1529 #endif
1530   _should_block = true;
1531 }
1532 
1533 // ------------------------------------------------------------------
1534 // CompileBroker::maybe_block
1535 //
1536 // Call this from the compiler at convenient points, to poll for _should_block.
1537 void CompileBroker::maybe_block() {
1538   if (_should_block) {
1539 #ifndef PRODUCT
1540     if (PrintCompilation && (Verbose || WizardMode))
1541       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1542 #endif
1543     ThreadInVMfromNative tivfn(JavaThread::current());
1544   }
1545 }
1546 
1547 // wrapper for CodeCache::print_summary()
1548 static void codecache_print(bool detailed)
1549 {
1550   ResourceMark rm;
1551   stringStream s;
1552   // Dump code cache  into a buffer before locking the tty,
1553   {
1554     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1555     CodeCache::print_summary(&s, detailed);
1556   }
1557   ttyLocker ttyl;
1558   tty->print("%s", s.as_string());
1559 }
1560 















































































































1561 // ------------------------------------------------------------------
1562 // CompileBroker::invoke_compiler_on_method
1563 //
1564 // Compile a method.
1565 //
1566 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1567   if (PrintCompilation) {
1568     ResourceMark rm;
1569     task->print_tty();
1570   }
1571   elapsedTimer time;
1572 
1573   CompilerThread* thread = CompilerThread::current();
1574   ResourceMark rm(thread);
1575 
1576   if (LogEvents) {
1577     _compilation_log->log_compile(thread, task);
1578   }
1579 
1580   // Common flags.
1581   uint compile_id = task->compile_id();
1582   int osr_bci = task->osr_bci();
1583   bool is_osr = (osr_bci != standard_entry_bci);
1584   bool should_log = (thread->log() != NULL);
1585   bool should_break = false;
1586   int task_level = task->comp_level();








1587   {
1588     // create the handle inside it's own block so it can't
1589     // accidentally be referenced once the thread transitions to
1590     // native.  The NoHandleMark before the transition should catch
1591     // any cases where this occurs in the future.
1592     methodHandle method(thread, task->method());
1593     should_break = check_break_at(method, compile_id, is_osr);
1594     if (should_log && !CompilerOracle::should_log(method)) {
1595       should_log = false;
1596     }
1597     assert(!method->is_native(), "no longer compile natives");
1598 
1599     // Save information about this method in case of failure.
1600     set_last_compile(thread, method, is_osr, task_level);
1601 
1602     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1603   }
1604 
1605   // Allocate a new set of JNI handles.
1606   push_jni_handle_block();
1607   Method* target_handle = task->method();
1608   int compilable = ciEnv::MethodCompilable;
1609   {
1610     int system_dictionary_modification_counter;
1611     {
1612       MutexLocker locker(Compile_lock, thread);
1613       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1614     }
1615 
1616     NoHandleMark  nhm;
1617     ThreadToNativeFromVM ttn(thread);
1618 
1619     ciEnv ci_env(task, system_dictionary_modification_counter);
1620     if (should_break) {
1621       ci_env.set_break_at_compile(true);
1622     }
1623     if (should_log) {
1624       ci_env.set_log(thread->log());
1625     }
1626     assert(thread->env() == &ci_env, "set by ci_env");
1627     // The thread-env() field is cleared in ~CompileTaskWrapper.
1628 
1629     // Cache Jvmti state
1630     ci_env.cache_jvmti_state();
1631 
1632     // Cache DTrace flags
1633     ci_env.cache_dtrace_flags();
1634 
1635     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1636 
1637     TraceTime t1("compilation", &time);
1638     EventCompilation event;
1639 
1640     AbstractCompiler *comp = compiler(task_level);
1641     if (comp == NULL) {
1642       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1643     } else {
1644       if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1645         MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1646         while (WhiteBox::compilation_locked) {
1647           locker.wait(Mutex::_no_safepoint_check_flag);
1648         }
1649       }
1650       comp->compile_method(&ci_env, target, osr_bci);
1651     }
1652 
1653     if (!ci_env.failing() && task->code() == NULL) {
1654       //assert(false, "compiler should always document failure");
1655       // The compiler elected, without comment, not to register a result.
1656       // Do not attempt further compilations of this method.
1657       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1658     }
1659 
1660     // Copy this bit to the enclosing block:
1661     compilable = ci_env.compilable();
1662 
1663     if (ci_env.failing()) {
1664       task->set_failure_reason(ci_env.failure_reason());
1665       ci_env.report_failure(ci_env.failure_reason());
1666       const char* retry_message = ci_env.retry_message();
1667       if (_compilation_log != NULL) {
1668         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1669       }
1670       if (PrintCompilation) {
1671         FormatBufferResource msg = retry_message != NULL ?
1672             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1673             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1674         task->print(tty, msg);
1675       }
1676     } else {
1677       task->mark_success();
1678       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1679       if (_compilation_log != NULL) {
1680         nmethod* code = task->code();
1681         if (code != NULL) {
1682           _compilation_log->log_nmethod(thread, code);
1683         }
1684       }
1685     }
1686     // simulate crash during compilation
1687     assert(task->compile_id() != CICrashAt, "just as planned");
1688     if (event.should_commit()) {
1689       event.set_method(target->get_Method());
1690       event.set_compileID(compile_id);
1691       event.set_compileLevel(task->comp_level());
1692       event.set_succeded(task->is_success());
1693       event.set_isOsr(is_osr);
1694       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1695       event.set_inlinedBytes(task->num_inlined_bytecodes());
1696       event.commit();
1697     }
1698   }
1699   pop_jni_handle_block();
1700 
1701   methodHandle method(thread, task->method());
1702 
1703   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1704 
1705   collect_statistics(thread, time, task);
1706 
1707   if (PrintCompilation && PrintCompilation2) {
1708     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
1709     tty->print("%4d ", compile_id);    // print compilation number
1710     tty->print("%s ", (is_osr ? "%" : " "));
1711     if (task->code() != NULL) {
1712       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1713     }
1714     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1715   }
1716 
1717   if (PrintCodeCacheOnCompilation)
1718     codecache_print(/* detailed= */ false);
1719 
1720   // Disable compilation, if required.
1721   switch (compilable) {
1722   case ciEnv::MethodCompilable_never:
1723     if (is_osr)
1724       method->set_not_osr_compilable_quietly();
1725     else
1726       method->set_not_compilable_quietly();
1727     break;
1728   case ciEnv::MethodCompilable_not_at_tier:
1729     if (is_osr)
1730       method->set_not_osr_compilable_quietly(task_level);
1731     else
1732       method->set_not_compilable_quietly(task_level);
1733     break;
1734   }
1735 
1736   // Note that the queued_for_compilation bits are cleared without
1737   // protection of a mutex. [They were set by the requester thread,
1738   // when adding the task to the compile queue -- at which time the
1739   // compile queue lock was held. Subsequently, we acquired the compile
1740   // queue lock to get this task off the compile queue; thus (to belabour
1741   // the point somewhat) our clearing of the bits must be occurring
1742   // only after the setting of the bits. See also 14012000 above.
1743   method->clear_queued_for_compilation();
1744 
1745 #ifdef ASSERT
1746   if (CollectedHeap::fired_fake_oom()) {
1747     // The current compile received a fake OOM during compilation so
1748     // go ahead and exit the VM since the test apparently succeeded
1749     tty->print_cr("*** Shutting down VM after successful fake OOM");
1750     vm_exit(0);
1751   }
1752 #endif
1753 }
1754 
1755 /**
1756  * The CodeCache is full. Print warning and disable compilation.
1757  * Schedule code cache cleaning so compilation can continue later.
1758  * This function needs to be called only from CodeCache::allocate(),
1759  * since we currently handle a full code cache uniformly.
1760  */
1761 void CompileBroker::handle_full_code_cache(int code_blob_type) {
1762   UseInterpreter = true;
1763   if (UseCompiler || AlwaysCompileLoopMethods ) {
1764     if (xtty != NULL) {
1765       ResourceMark rm;
1766       stringStream s;
1767       // Dump code cache state into a buffer before locking the tty,
1768       // because log_state() will use locks causing lock conflicts.
1769       CodeCache::log_state(&s);
1770       // Lock to prevent tearing
1771       ttyLocker ttyl;
1772       xtty->begin_elem("code_cache_full");
1773       xtty->print("%s", s.as_string());
1774       xtty->stamp();
1775       xtty->end_elem();
1776     }
1777 
1778 #ifndef PRODUCT
1779     if (CompileTheWorld || ExitOnFullCodeCache) {
1780       codecache_print(/* detailed= */ true);
1781       before_exit(JavaThread::current());
1782       exit_globals(); // will delete tty
1783       vm_direct_exit(CompileTheWorld ? 0 : 1);
1784     }
1785 #endif
1786     if (UseCodeCacheFlushing) {
1787       // Since code cache is full, immediately stop new compiles
1788       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
1789         NMethodSweeper::log_sweep("disable_compiler");
1790       }
1791     } else {
1792       disable_compilation_forever();
1793     }
1794 
1795     CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
1796   }
1797 }
1798 
1799 // ------------------------------------------------------------------
1800 // CompileBroker::set_last_compile
1801 //
1802 // Record this compilation for debugging purposes.
1803 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1804   ResourceMark rm;
1805   char* method_name = method->name()->as_C_string();
1806   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1807   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
1808   char current_method[CompilerCounters::cmname_buffer_length];
1809   size_t maxLen = CompilerCounters::cmname_buffer_length;
1810 
1811   if (UsePerfData) {
1812     const char* class_name = method->method_holder()->name()->as_C_string();
1813 
1814     size_t s1len = strlen(class_name);
1815     size_t s2len = strlen(method_name);
1816 
1817     // check if we need to truncate the string
1818     if (s1len + s2len + 2 > maxLen) {
1819 
1820       // the strategy is to lop off the leading characters of the
1821       // class name and the trailing characters of the method name.
1822 
1823       if (s2len + 2 > maxLen) {
1824         // lop of the entire class name string, let snprintf handle
1825         // truncation of the method name.
1826         class_name += s1len; // null string
1827       }
1828       else {
1829         // lop off the extra characters from the front of the class name
1830         class_name += ((s1len + s2len + 2) - maxLen);
1831       }
1832     }
1833 
1834     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1835   }
1836 
1837   if (CICountOSR && is_osr) {
1838     _last_compile_type = osr_compile;
1839   } else {
1840     _last_compile_type = normal_compile;
1841   }
1842   _last_compile_level = comp_level;
1843 
1844   if (UsePerfData) {
1845     CompilerCounters* counters = thread->counters();
1846     counters->set_current_method(current_method);
1847     counters->set_compile_type((jlong)_last_compile_type);
1848   }
1849 }
1850 
1851 
1852 // ------------------------------------------------------------------
1853 // CompileBroker::push_jni_handle_block
1854 //
1855 // Push on a new block of JNI handles.
1856 void CompileBroker::push_jni_handle_block() {
1857   JavaThread* thread = JavaThread::current();
1858 
1859   // Allocate a new block for JNI handles.
1860   // Inlined code from jni_PushLocalFrame()
1861   JNIHandleBlock* java_handles = thread->active_handles();
1862   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
1863   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
1864   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
1865   thread->set_active_handles(compile_handles);
1866 }
1867 
1868 
1869 // ------------------------------------------------------------------
1870 // CompileBroker::pop_jni_handle_block
1871 //
1872 // Pop off the current block of JNI handles.
1873 void CompileBroker::pop_jni_handle_block() {
1874   JavaThread* thread = JavaThread::current();
1875 
1876   // Release our JNI handle block
1877   JNIHandleBlock* compile_handles = thread->active_handles();
1878   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
1879   thread->set_active_handles(java_handles);
1880   compile_handles->set_pop_frame_link(NULL);
1881   JNIHandleBlock::release_block(compile_handles, thread); // may block
1882 }
1883 
1884 
1885 // ------------------------------------------------------------------
1886 // CompileBroker::check_break_at
1887 //
1888 // Should the compilation break at the current compilation.
1889 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
1890   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
1891     return true;
1892   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
1893     return true;
1894   } else {
1895     return (compile_id == CIBreakAt);
1896   }
1897 }
1898 
1899 // ------------------------------------------------------------------
1900 // CompileBroker::collect_statistics
1901 //
1902 // Collect statistics about the compilation.
1903 
1904 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
1905   bool success = task->is_success();
1906   methodHandle method (thread, task->method());
1907   uint compile_id = task->compile_id();
1908   bool is_osr = (task->osr_bci() != standard_entry_bci);
1909   nmethod* code = task->code();
1910   CompilerCounters* counters = thread->counters();
1911 
1912   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
1913   MutexLocker locker(CompileStatistics_lock);
1914 
1915   // _perf variables are production performance counters which are
1916   // updated regardless of the setting of the CITime and CITimeEach flags
1917   //
1918 
1919   // account all time, including bailouts and failures in this counter;
1920   // C1 and C2 counters are counting both successful and unsuccessful compiles
1921   _t_total_compilation.add(time);
1922 
1923   if (!success) {
1924     _total_bailout_count++;
1925     if (UsePerfData) {
1926       _perf_last_failed_method->set_value(counters->current_method());
1927       _perf_last_failed_type->set_value(counters->compile_type());
1928       _perf_total_bailout_count->inc();
1929     }
1930     _t_bailedout_compilation.add(time);
1931   } else if (code == NULL) {
1932     if (UsePerfData) {
1933       _perf_last_invalidated_method->set_value(counters->current_method());
1934       _perf_last_invalidated_type->set_value(counters->compile_type());
1935       _perf_total_invalidated_count->inc();
1936     }
1937     _total_invalidated_count++;
1938     _t_invalidated_compilation.add(time);
1939   } else {
1940     // Compilation succeeded
1941 
1942     // update compilation ticks - used by the implementation of
1943     // java.lang.management.CompilationMBean
1944     _perf_total_compilation->inc(time.ticks());
1945     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
1946 
1947     if (CITime) {
1948       if (is_osr) {
1949         _t_osr_compilation.add(time);
1950         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1951       } else {
1952         _t_standard_compilation.add(time);
1953         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1954       }
1955     }
1956 
1957     if (UsePerfData) {
1958       // save the name of the last method compiled
1959       _perf_last_method->set_value(counters->current_method());
1960       _perf_last_compile_type->set_value(counters->compile_type());
1961       _perf_last_compile_size->set_value(method->code_size() +
1962                                          task->num_inlined_bytecodes());
1963       if (is_osr) {
1964         _perf_osr_compilation->inc(time.ticks());
1965         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1966       } else {
1967         _perf_standard_compilation->inc(time.ticks());
1968         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1969       }
1970     }
1971 
1972     if (CITimeEach) {
1973       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
1974       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
1975                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
1976     }
1977 
1978     // Collect counts of successful compilations
1979     _sum_nmethod_size      += code->total_size();
1980     _sum_nmethod_code_size += code->insts_size();
1981     _total_compile_count++;
1982 
1983     if (UsePerfData) {
1984       _perf_sum_nmethod_size->inc(     code->total_size());
1985       _perf_sum_nmethod_code_size->inc(code->insts_size());
1986       _perf_total_compile_count->inc();
1987     }
1988 
1989     if (is_osr) {
1990       if (UsePerfData) _perf_total_osr_compile_count->inc();
1991       _total_osr_compile_count++;
1992     } else {
1993       if (UsePerfData) _perf_total_standard_compile_count->inc();
1994       _total_standard_compile_count++;
1995     }
1996   }
1997   // set the current method for the thread to null
1998   if (UsePerfData) counters->set_current_method("");
1999 }
2000 
2001 const char* CompileBroker::compiler_name(int comp_level) {
2002   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2003   if (comp == NULL) {
2004     return "no compiler";
2005   } else {
2006     return (comp->name());
2007   }
2008 }
2009 
2010 void CompileBroker::print_times() {
2011   tty->cr();
2012   tty->print_cr("Accumulated compiler times");
2013   tty->print_cr("----------------------------------------------------------");
2014                //0000000000111111111122222222223333333333444444444455555555556666666666
2015                //0123456789012345678901234567890123456789012345678901234567890123456789
2016   tty->print_cr("  Total compilation time   : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2017   tty->print_cr("    Standard compilation   : %7.3f s, Average : %2.3f s",
2018                 CompileBroker::_t_standard_compilation.seconds(),
2019                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2020   tty->print_cr("    Bailed out compilation : %7.3f s, Average : %2.3f s",
2021                 CompileBroker::_t_bailedout_compilation.seconds(),
2022                 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2023   tty->print_cr("    On stack replacement   : %7.3f s, Average : %2.3f s",
2024                 CompileBroker::_t_osr_compilation.seconds(),
2025                 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2026   tty->print_cr("    Invalidated            : %7.3f s, Average : %2.3f s",
2027                 CompileBroker::_t_invalidated_compilation.seconds(),
2028                 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2029 
2030   AbstractCompiler *comp = compiler(CompLevel_simple);
2031   if (comp != NULL) {
2032     tty->cr();
2033     comp->print_timers();
2034   }
2035   comp = compiler(CompLevel_full_optimization);
2036   if (comp != NULL) {
2037     tty->cr();
2038     comp->print_timers();
2039   }
2040   tty->cr();
2041   tty->print_cr("  Total compiled methods    : %8d methods", CompileBroker::_total_compile_count);
2042   tty->print_cr("    Standard compilation    : %8d methods", CompileBroker::_total_standard_compile_count);
2043   tty->print_cr("    On stack replacement    : %8d methods", CompileBroker::_total_osr_compile_count);
2044   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2045   tty->print_cr("  Total compiled bytecodes  : %8d bytes", tcb);
2046   tty->print_cr("    Standard compilation    : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2047   tty->print_cr("    On stack replacement    : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2048   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2049   tty->print_cr("  Average compilation speed : %8d bytes/s", bps);
2050   tty->cr();
2051   tty->print_cr("  nmethod code size         : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2052   tty->print_cr("  nmethod total size        : %8d bytes", CompileBroker::_sum_nmethod_size);
2053 }
2054 
2055 // Debugging output for failure
2056 void CompileBroker::print_last_compile() {
2057   if ( _last_compile_level != CompLevel_none &&
2058        compiler(_last_compile_level) != NULL &&
2059        _last_method_compiled != NULL &&
2060        _last_compile_type != no_compile) {
2061     if (_last_compile_type == osr_compile) {
2062       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2063                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2064     } else {
2065       tty->print_cr("Last parse:  %d+++(%d) %s",
2066                     _compilation_id, _last_compile_level, _last_method_compiled);
2067     }
2068   }
2069 }
2070 
2071 
2072 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2073 #ifndef PRODUCT
2074   st->print_cr("Compiler thread printing unimplemented.");
2075   st->cr();
2076 #endif
2077 }

--- EOF ---