1 /*
   2  * Copyright (c) 1999, 2019, 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 "jvm.h"
  27 #include "classfile/symbolTable.hpp"
  28 #include "classfile/systemDictionary.hpp"
  29 #include "classfile/vmSymbols.hpp"
  30 #include "code/codeCache.hpp"
  31 #include "code/codeHeapState.hpp"
  32 #include "code/dependencyContext.hpp"
  33 #include "compiler/compileBroker.hpp"
  34 #include "compiler/compileLog.hpp"
  35 #include "compiler/compilerOracle.hpp"
  36 #include "compiler/directivesParser.hpp"
  37 #include "interpreter/linkResolver.hpp"
  38 #include "jfr/jfrEvents.hpp"
  39 #include "logging/log.hpp"
  40 #include "logging/logStream.hpp"
  41 #include "memory/allocation.inline.hpp"
  42 #include "memory/resourceArea.hpp"
  43 #include "oops/methodData.hpp"
  44 #include "oops/method.inline.hpp"
  45 #include "oops/oop.inline.hpp"
  46 #include "prims/nativeLookup.hpp"
  47 #include "prims/whitebox.hpp"
  48 #include "runtime/arguments.hpp"
  49 #include "runtime/atomic.hpp"
  50 #include "runtime/compilationPolicy.hpp"
  51 #include "runtime/handles.inline.hpp"
  52 #include "runtime/init.hpp"
  53 #include "runtime/interfaceSupport.inline.hpp"
  54 #include "runtime/javaCalls.hpp"
  55 #include "runtime/jniHandles.inline.hpp"
  56 #include "runtime/os.hpp"
  57 #include "runtime/safepointVerifiers.hpp"
  58 #include "runtime/sharedRuntime.hpp"
  59 #include "runtime/sweeper.hpp"
  60 #include "runtime/timerTrace.hpp"
  61 #include "runtime/vframe.inline.hpp"
  62 #include "utilities/debug.hpp"
  63 #include "utilities/dtrace.hpp"
  64 #include "utilities/events.hpp"
  65 #include "utilities/formatBuffer.hpp"
  66 #include "utilities/macros.hpp"
  67 #ifdef COMPILER1
  68 #include "c1/c1_Compiler.hpp"
  69 #endif
  70 #if INCLUDE_JVMCI
  71 #include "jvmci/jvmciEnv.hpp"
  72 #include "jvmci/jvmciRuntime.hpp"
  73 #endif
  74 #ifdef COMPILER2
  75 #include "opto/c2compiler.hpp"
  76 #endif
  77 
  78 #ifdef DTRACE_ENABLED
  79 
  80 // Only bother with this argument setup if dtrace is available
  81 
  82 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \
  83   {                                                                      \
  84     Symbol* klass_name = (method)->klass_name();                         \
  85     Symbol* name = (method)->name();                                     \
  86     Symbol* signature = (method)->signature();                           \
  87     HOTSPOT_METHOD_COMPILE_BEGIN(                                        \
  88       (char *) comp_name, strlen(comp_name),                             \
  89       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
  90       (char *) name->bytes(), name->utf8_length(),                       \
  91       (char *) signature->bytes(), signature->utf8_length());            \
  92   }
  93 
  94 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \
  95   {                                                                      \
  96     Symbol* klass_name = (method)->klass_name();                         \
  97     Symbol* name = (method)->name();                                     \
  98     Symbol* signature = (method)->signature();                           \
  99     HOTSPOT_METHOD_COMPILE_END(                                          \
 100       (char *) comp_name, strlen(comp_name),                             \
 101       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
 102       (char *) name->bytes(), name->utf8_length(),                       \
 103       (char *) signature->bytes(), signature->utf8_length(), (success)); \
 104   }
 105 
 106 #else //  ndef DTRACE_ENABLED
 107 
 108 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
 109 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
 110 
 111 #endif // ndef DTRACE_ENABLED
 112 
 113 bool CompileBroker::_initialized = false;
 114 volatile bool CompileBroker::_should_block = false;
 115 volatile int  CompileBroker::_print_compilation_warning = 0;
 116 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 117 
 118 // The installed compiler(s)
 119 AbstractCompiler* CompileBroker::_compilers[2];
 120 
 121 // The maximum numbers of compiler threads to be determined during startup.
 122 int CompileBroker::_c1_count = 0;
 123 int CompileBroker::_c2_count = 0;
 124 
 125 // An array of compiler names as Java String objects
 126 jobject* CompileBroker::_compiler1_objects = NULL;
 127 jobject* CompileBroker::_compiler2_objects = NULL;
 128 
 129 CompileLog** CompileBroker::_compiler1_logs = NULL;
 130 CompileLog** CompileBroker::_compiler2_logs = NULL;
 131 
 132 // These counters are used to assign an unique ID to each compilation.
 133 volatile jint CompileBroker::_compilation_id     = 0;
 134 volatile jint CompileBroker::_osr_compilation_id = 0;
 135 
 136 // Performance counters
 137 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 138 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 139 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 140 
 141 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 142 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 143 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 144 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 145 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 146 
 147 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 148 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 149 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 150 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 151 
 152 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 153 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 154 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 155 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 156 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 157 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 158 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 159 
 160 // Timers and counters for generating statistics
 161 elapsedTimer CompileBroker::_t_total_compilation;
 162 elapsedTimer CompileBroker::_t_osr_compilation;
 163 elapsedTimer CompileBroker::_t_standard_compilation;
 164 elapsedTimer CompileBroker::_t_invalidated_compilation;
 165 elapsedTimer CompileBroker::_t_bailedout_compilation;
 166 
 167 int CompileBroker::_total_bailout_count            = 0;
 168 int CompileBroker::_total_invalidated_count        = 0;
 169 int CompileBroker::_total_compile_count            = 0;
 170 int CompileBroker::_total_osr_compile_count        = 0;
 171 int CompileBroker::_total_standard_compile_count   = 0;
 172 int CompileBroker::_total_compiler_stopped_count   = 0;
 173 int CompileBroker::_total_compiler_restarted_count = 0;
 174 
 175 int CompileBroker::_sum_osr_bytes_compiled         = 0;
 176 int CompileBroker::_sum_standard_bytes_compiled    = 0;
 177 int CompileBroker::_sum_nmethod_size               = 0;
 178 int CompileBroker::_sum_nmethod_code_size          = 0;
 179 
 180 long CompileBroker::_peak_compilation_time         = 0;
 181 
 182 CompileQueue* CompileBroker::_c2_compile_queue     = NULL;
 183 CompileQueue* CompileBroker::_c1_compile_queue     = NULL;
 184 
 185 
 186 
 187 class CompilationLog : public StringEventLog {
 188  public:
 189   CompilationLog() : StringEventLog("Compilation events") {
 190   }
 191 
 192   void log_compile(JavaThread* thread, CompileTask* task) {
 193     StringLogMessage lm;
 194     stringStream sstr = lm.stream();
 195     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 196     task->print(&sstr, NULL, true, false);
 197     log(thread, "%s", (const char*)lm);
 198   }
 199 
 200   void log_nmethod(JavaThread* thread, nmethod* nm) {
 201     log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 202         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 203         p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
 204   }
 205 
 206   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 207     StringLogMessage lm;
 208     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 209     if (retry_message != NULL) {
 210       lm.append(" (%s)", retry_message);
 211     }
 212     lm.print("\n");
 213     log(thread, "%s", (const char*)lm);
 214   }
 215 
 216   void log_metaspace_failure(const char* reason) {
 217     ResourceMark rm;
 218     StringLogMessage lm;
 219     lm.print("%4d   COMPILE PROFILING SKIPPED: %s", -1, reason);
 220     lm.print("\n");
 221     log(JavaThread::current(), "%s", (const char*)lm);
 222   }
 223 };
 224 
 225 static CompilationLog* _compilation_log = NULL;
 226 
 227 bool compileBroker_init() {
 228   if (LogEvents) {
 229     _compilation_log = new CompilationLog();
 230   }
 231 
 232   // init directives stack, adding default directive
 233   DirectivesStack::init();
 234 
 235   if (DirectivesParser::has_file()) {
 236     return DirectivesParser::parse_from_flag();
 237   } else if (CompilerDirectivesPrint) {
 238     // Print default directive even when no other was added
 239     DirectivesStack::print(tty);
 240   }
 241 
 242   return true;
 243 }
 244 
 245 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 246   CompilerThread* thread = CompilerThread::current();
 247   thread->set_task(task);
 248 #if INCLUDE_JVMCI
 249   if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) {
 250     task->set_jvmci_compiler_thread(thread);
 251   }
 252 #endif
 253   CompileLog*     log  = thread->log();
 254   if (log != NULL && !task->is_unloaded())  task->log_task_start(log);
 255 }
 256 
 257 CompileTaskWrapper::~CompileTaskWrapper() {
 258   CompilerThread* thread = CompilerThread::current();
 259   CompileTask* task = thread->task();
 260   CompileLog*  log  = thread->log();
 261   if (log != NULL && !task->is_unloaded())  task->log_task_done(log);
 262   thread->set_task(NULL);
 263   task->set_code_handle(NULL);
 264   thread->set_env(NULL);
 265   if (task->is_blocking()) {
 266     bool free_task = false;
 267     {
 268       MutexLocker notifier(task->lock(), thread);
 269       task->mark_complete();
 270 #if INCLUDE_JVMCI
 271       if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
 272         if (!task->has_waiter()) {
 273           // The waiting thread timed out and thus did not free the task.
 274           free_task = true;
 275         }
 276         task->set_jvmci_compiler_thread(NULL);
 277       }
 278 #endif
 279       if (!free_task) {
 280         // Notify the waiting thread that the compilation has completed
 281         // so that it can free the task.
 282         task->lock()->notify_all();
 283       }
 284     }
 285     if (free_task) {
 286       // The task can only be freed once the task lock is released.
 287       CompileTask::free(task);
 288     }
 289   } else {
 290     task->mark_complete();
 291 
 292     // By convention, the compiling thread is responsible for
 293     // recycling a non-blocking CompileTask.
 294     CompileTask::free(task);
 295   }
 296 }
 297 
 298 /**
 299  * Check if a CompilerThread can be removed and update count if requested.
 300  */
 301 static bool can_remove(CompilerThread *ct, bool do_it) {
 302   assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
 303   if (!ReduceNumberOfCompilerThreads) return false;
 304 
 305   AbstractCompiler *compiler = ct->compiler();
 306   int compiler_count = compiler->num_compiler_threads();
 307   bool c1 = compiler->is_c1();
 308 
 309   // Keep at least 1 compiler thread of each type.
 310   if (compiler_count < 2) return false;
 311 
 312   // Keep thread alive for at least some time.
 313   if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
 314 
 315   // We only allow the last compiler thread of each type to get removed.
 316   jobject last_compiler = c1 ? CompileBroker::compiler1_object(compiler_count - 1)
 317                              : CompileBroker::compiler2_object(compiler_count - 1);
 318   if (oopDesc::equals(ct->threadObj(), JNIHandles::resolve_non_null(last_compiler))) {
 319     if (do_it) {
 320       assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
 321       compiler->set_num_compiler_threads(compiler_count - 1);
 322     }
 323     return true;
 324   }
 325   return false;
 326 }
 327 
 328 /**
 329  * Add a CompileTask to a CompileQueue.
 330  */
 331 void CompileQueue::add(CompileTask* task) {
 332   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 333 
 334   task->set_next(NULL);
 335   task->set_prev(NULL);
 336 
 337   if (_last == NULL) {
 338     // The compile queue is empty.
 339     assert(_first == NULL, "queue is empty");
 340     _first = task;
 341     _last = task;
 342   } else {
 343     // Append the task to the queue.
 344     assert(_last->next() == NULL, "not last");
 345     _last->set_next(task);
 346     task->set_prev(_last);
 347     _last = task;
 348   }
 349   ++_size;
 350 
 351   // Mark the method as being in the compile queue.
 352   task->method()->set_queued_for_compilation();
 353 
 354   if (CIPrintCompileQueue) {
 355     print_tty();
 356   }
 357 
 358   if (LogCompilation && xtty != NULL) {
 359     task->log_task_queued();
 360   }
 361 
 362   // Notify CompilerThreads that a task is available.
 363   MethodCompileQueue_lock->notify_all();
 364 }
 365 
 366 /**
 367  * Empties compilation queue by putting all compilation tasks onto
 368  * a freelist. Furthermore, the method wakes up all threads that are
 369  * waiting on a compilation task to finish. This can happen if background
 370  * compilation is disabled.
 371  */
 372 void CompileQueue::free_all() {
 373   MutexLocker mu(MethodCompileQueue_lock);
 374   CompileTask* next = _first;
 375 
 376   // Iterate over all tasks in the compile queue
 377   while (next != NULL) {
 378     CompileTask* current = next;
 379     next = current->next();
 380     {
 381       // Wake up thread that blocks on the compile task.
 382       MutexLocker ct_lock(current->lock());
 383       current->lock()->notify();
 384     }
 385     // Put the task back on the freelist.
 386     CompileTask::free(current);
 387   }
 388   _first = NULL;
 389 
 390   // Wake up all threads that block on the queue.
 391   MethodCompileQueue_lock->notify_all();
 392 }
 393 
 394 /**
 395  * Get the next CompileTask from a CompileQueue
 396  */
 397 CompileTask* CompileQueue::get() {
 398   // save methods from RedefineClasses across safepoint
 399   // across MethodCompileQueue_lock below.
 400   methodHandle save_method;
 401   methodHandle save_hot_method;
 402 
 403   MonitorLocker locker(MethodCompileQueue_lock);
 404   // If _first is NULL we have no more compile jobs. There are two reasons for
 405   // having no compile jobs: First, we compiled everything we wanted. Second,
 406   // we ran out of code cache so compilation has been disabled. In the latter
 407   // case we perform code cache sweeps to free memory such that we can re-enable
 408   // compilation.
 409   while (_first == NULL) {
 410     // Exit loop if compilation is disabled forever
 411     if (CompileBroker::is_compilation_disabled_forever()) {
 412       return NULL;
 413     }
 414 
 415     // If there are no compilation tasks and we can compile new jobs
 416     // (i.e., there is enough free space in the code cache) there is
 417     // no need to invoke the sweeper. As a result, the hotness of methods
 418     // remains unchanged. This behavior is desired, since we want to keep
 419     // the stable state, i.e., we do not want to evict methods from the
 420     // code cache if it is unnecessary.
 421     // We need a timed wait here, since compiler threads can exit if compilation
 422     // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 423     // is not critical and we do not want idle compiler threads to wake up too often.
 424     locker.wait(5*1000);
 425 
 426     if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
 427       // Still nothing to compile. Give caller a chance to stop this thread.
 428       if (can_remove(CompilerThread::current(), false)) return NULL;
 429     }
 430   }
 431 
 432   if (CompileBroker::is_compilation_disabled_forever()) {
 433     return NULL;
 434   }
 435 
 436   CompileTask* task;
 437   {
 438     NoSafepointVerifier nsv;
 439     task = CompilationPolicy::policy()->select_task(this);
 440     if (task != NULL) {
 441       task = task->select_for_compilation();
 442     }
 443   }
 444 
 445   if (task != NULL) {
 446     // Save method pointers across unlock safepoint.  The task is removed from
 447     // the compilation queue, which is walked during RedefineClasses.
 448     save_method = methodHandle(task->method());
 449     save_hot_method = methodHandle(task->hot_method());
 450 
 451     remove(task);
 452   }
 453   purge_stale_tasks(); // may temporarily release MCQ lock
 454   return task;
 455 }
 456 
 457 // Clean & deallocate stale compile tasks.
 458 // Temporarily releases MethodCompileQueue lock.
 459 void CompileQueue::purge_stale_tasks() {
 460   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 461   if (_first_stale != NULL) {
 462     // Stale tasks are purged when MCQ lock is released,
 463     // but _first_stale updates are protected by MCQ lock.
 464     // Once task processing starts and MCQ lock is released,
 465     // other compiler threads can reuse _first_stale.
 466     CompileTask* head = _first_stale;
 467     _first_stale = NULL;
 468     {
 469       MutexUnlocker ul(MethodCompileQueue_lock);
 470       for (CompileTask* task = head; task != NULL; ) {
 471         CompileTask* next_task = task->next();
 472         CompileTaskWrapper ctw(task); // Frees the task
 473         task->set_failure_reason("stale task");
 474         task = next_task;
 475       }
 476     }
 477   }
 478 }
 479 
 480 void CompileQueue::remove(CompileTask* task) {
 481   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 482   if (task->prev() != NULL) {
 483     task->prev()->set_next(task->next());
 484   } else {
 485     // max is the first element
 486     assert(task == _first, "Sanity");
 487     _first = task->next();
 488   }
 489 
 490   if (task->next() != NULL) {
 491     task->next()->set_prev(task->prev());
 492   } else {
 493     // max is the last element
 494     assert(task == _last, "Sanity");
 495     _last = task->prev();
 496   }
 497   --_size;
 498 }
 499 
 500 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 501   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 502   remove(task);
 503 
 504   // Enqueue the task for reclamation (should be done outside MCQ lock)
 505   task->set_next(_first_stale);
 506   task->set_prev(NULL);
 507   _first_stale = task;
 508 }
 509 
 510 // methods in the compile queue need to be marked as used on the stack
 511 // so that they don't get reclaimed by Redefine Classes
 512 void CompileQueue::mark_on_stack() {
 513   CompileTask* task = _first;
 514   while (task != NULL) {
 515     task->mark_on_stack();
 516     task = task->next();
 517   }
 518 }
 519 
 520 
 521 CompileQueue* CompileBroker::compile_queue(int comp_level) {
 522   if (is_c2_compile(comp_level)) return _c2_compile_queue;
 523   if (is_c1_compile(comp_level)) return _c1_compile_queue;
 524   return NULL;
 525 }
 526 
 527 void CompileBroker::print_compile_queues(outputStream* st) {
 528   st->print_cr("Current compiles: ");
 529 
 530   char buf[2000];
 531   int buflen = sizeof(buf);
 532   Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
 533 
 534   st->cr();
 535   if (_c1_compile_queue != NULL) {
 536     _c1_compile_queue->print(st);
 537   }
 538   if (_c2_compile_queue != NULL) {
 539     _c2_compile_queue->print(st);
 540   }
 541 }
 542 
 543 void CompileQueue::print(outputStream* st) {
 544   assert_locked_or_safepoint(MethodCompileQueue_lock);
 545   st->print_cr("%s:", name());
 546   CompileTask* task = _first;
 547   if (task == NULL) {
 548     st->print_cr("Empty");
 549   } else {
 550     while (task != NULL) {
 551       task->print(st, NULL, true, true);
 552       task = task->next();
 553     }
 554   }
 555   st->cr();
 556 }
 557 
 558 void CompileQueue::print_tty() {
 559   ttyLocker ttyl;
 560   print(tty);
 561 }
 562 
 563 CompilerCounters::CompilerCounters() {
 564   _current_method[0] = '\0';
 565   _compile_type = CompileBroker::no_compile;
 566 }
 567 
 568 // ------------------------------------------------------------------
 569 // CompileBroker::compilation_init
 570 //
 571 // Initialize the Compilation object
 572 void CompileBroker::compilation_init_phase1(TRAPS) {
 573   // No need to initialize compilation system if we do not use it.
 574   if (!UseCompiler) {
 575     return;
 576   }
 577   // Set the interface to the current compiler(s).
 578   _c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 579   _c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 580 
 581 #if INCLUDE_JVMCI
 582   if (EnableJVMCI) {
 583     // This is creating a JVMCICompiler singleton.
 584     JVMCICompiler* jvmci = new JVMCICompiler();
 585 
 586     if (UseJVMCICompiler) {
 587       _compilers[1] = jvmci;
 588       if (FLAG_IS_DEFAULT(JVMCIThreads)) {
 589         if (BootstrapJVMCI) {
 590           // JVMCI will bootstrap so give it more threads
 591           _c2_count = MIN2(32, os::active_processor_count());
 592         }
 593       } else {
 594         _c2_count = JVMCIThreads;
 595       }
 596       if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
 597       } else {
 598         _c1_count = JVMCIHostThreads;
 599       }
 600     }
 601   }
 602 #endif // INCLUDE_JVMCI
 603 
 604 #ifdef COMPILER1
 605   if (_c1_count > 0) {
 606     _compilers[0] = new Compiler();
 607   }
 608 #endif // COMPILER1
 609 
 610 #ifdef COMPILER2
 611   if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
 612     if (_c2_count > 0) {
 613       _compilers[1] = new C2Compiler();
 614     }
 615   }
 616 #endif // COMPILER2
 617 
 618   // Start the compiler thread(s) and the sweeper thread
 619   init_compiler_sweeper_threads();
 620   // totalTime performance counter is always created as it is required
 621   // by the implementation of java.lang.management.CompilationMBean.
 622   {
 623     EXCEPTION_MARK;
 624     _perf_total_compilation =
 625                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 626                                                  PerfData::U_Ticks, CHECK);
 627   }
 628 
 629   if (UsePerfData) {
 630 
 631     EXCEPTION_MARK;
 632 
 633     // create the jvmstat performance counters
 634     _perf_osr_compilation =
 635                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 636                                                  PerfData::U_Ticks, CHECK);
 637 
 638     _perf_standard_compilation =
 639                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 640                                                  PerfData::U_Ticks, CHECK);
 641 
 642     _perf_total_bailout_count =
 643                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 644                                                  PerfData::U_Events, CHECK);
 645 
 646     _perf_total_invalidated_count =
 647                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 648                                                  PerfData::U_Events, CHECK);
 649 
 650     _perf_total_compile_count =
 651                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 652                                                  PerfData::U_Events, CHECK);
 653     _perf_total_osr_compile_count =
 654                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 655                                                  PerfData::U_Events, CHECK);
 656 
 657     _perf_total_standard_compile_count =
 658                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 659                                                  PerfData::U_Events, CHECK);
 660 
 661     _perf_sum_osr_bytes_compiled =
 662                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 663                                                  PerfData::U_Bytes, CHECK);
 664 
 665     _perf_sum_standard_bytes_compiled =
 666                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 667                                                  PerfData::U_Bytes, CHECK);
 668 
 669     _perf_sum_nmethod_size =
 670                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 671                                                  PerfData::U_Bytes, CHECK);
 672 
 673     _perf_sum_nmethod_code_size =
 674                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 675                                                  PerfData::U_Bytes, CHECK);
 676 
 677     _perf_last_method =
 678                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 679                                        CompilerCounters::cmname_buffer_length,
 680                                        "", CHECK);
 681 
 682     _perf_last_failed_method =
 683             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 684                                        CompilerCounters::cmname_buffer_length,
 685                                        "", CHECK);
 686 
 687     _perf_last_invalidated_method =
 688         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 689                                      CompilerCounters::cmname_buffer_length,
 690                                      "", CHECK);
 691 
 692     _perf_last_compile_type =
 693              PerfDataManager::create_variable(SUN_CI, "lastType",
 694                                               PerfData::U_None,
 695                                               (jlong)CompileBroker::no_compile,
 696                                               CHECK);
 697 
 698     _perf_last_compile_size =
 699              PerfDataManager::create_variable(SUN_CI, "lastSize",
 700                                               PerfData::U_Bytes,
 701                                               (jlong)CompileBroker::no_compile,
 702                                               CHECK);
 703 
 704 
 705     _perf_last_failed_type =
 706              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 707                                               PerfData::U_None,
 708                                               (jlong)CompileBroker::no_compile,
 709                                               CHECK);
 710 
 711     _perf_last_invalidated_type =
 712          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 713                                           PerfData::U_None,
 714                                           (jlong)CompileBroker::no_compile,
 715                                           CHECK);
 716   }
 717 }
 718 
 719 // Completes compiler initialization. Compilation requests submitted
 720 // prior to this will be silently ignored.
 721 void CompileBroker::compilation_init_phase2() {
 722   _initialized = true;
 723 }
 724 
 725 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
 726   Handle string = java_lang_String::create_from_str(name, CHECK_NH);
 727   Handle thread_group(THREAD, Universe::system_thread_group());
 728   return JavaCalls::construct_new_instance(
 729                        SystemDictionary::Thread_klass(),
 730                        vmSymbols::threadgroup_string_void_signature(),
 731                        thread_group,
 732                        string,
 733                        CHECK_NH);
 734 }
 735 
 736 
 737 JavaThread* CompileBroker::make_thread(jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, TRAPS) {
 738   JavaThread* thread = NULL;
 739   {
 740     MutexLocker mu(Threads_lock, THREAD);
 741     if (comp != NULL) {
 742       if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
 743         CompilerCounters* counters = new CompilerCounters();
 744         thread = new CompilerThread(queue, counters);
 745       }
 746     } else {
 747       thread = new CodeCacheSweeperThread();
 748     }
 749     // At this point the new CompilerThread data-races with this startup
 750     // thread (which I believe is the primoridal thread and NOT the VM
 751     // thread).  This means Java bytecodes being executed at startup can
 752     // queue compile jobs which will run at whatever default priority the
 753     // newly created CompilerThread runs at.
 754 
 755 
 756     // At this point it may be possible that no osthread was created for the
 757     // JavaThread due to lack of memory. We would have to throw an exception
 758     // in that case. However, since this must work and we do not allow
 759     // exceptions anyway, check and abort if this fails. But first release the
 760     // lock.
 761 
 762     if (thread != NULL && thread->osthread() != NULL) {
 763 
 764       java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), thread);
 765 
 766       // Note that this only sets the JavaThread _priority field, which by
 767       // definition is limited to Java priorities and not OS priorities.
 768       // The os-priority is set in the CompilerThread startup code itself
 769 
 770       java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority);
 771 
 772       // Note that we cannot call os::set_priority because it expects Java
 773       // priorities and we are *explicitly* using OS priorities so that it's
 774       // possible to set the compiler thread priority higher than any Java
 775       // thread.
 776 
 777       int native_prio = CompilerThreadPriority;
 778       if (native_prio == -1) {
 779         if (UseCriticalCompilerThreadPriority) {
 780           native_prio = os::java_to_os_priority[CriticalPriority];
 781         } else {
 782           native_prio = os::java_to_os_priority[NearMaxPriority];
 783         }
 784       }
 785       os::set_native_priority(thread, native_prio);
 786 
 787       java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle));
 788 
 789       thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle));
 790       if (comp != NULL) {
 791         thread->as_CompilerThread()->set_compiler(comp);
 792       }
 793       Threads::add(thread);
 794       Thread::start(thread);
 795     }
 796   }
 797 
 798   // First release lock before aborting VM.
 799   if (thread == NULL || thread->osthread() == NULL) {
 800     if (UseDynamicNumberOfCompilerThreads && comp != NULL && comp->num_compiler_threads() > 0) {
 801       if (thread != NULL) {
 802         thread->smr_delete();
 803       }
 804       return NULL;
 805     }
 806     vm_exit_during_initialization("java.lang.OutOfMemoryError",
 807                                   os::native_thread_creation_failed_msg());
 808   }
 809 
 810   // Let go of Threads_lock before yielding
 811   os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 812 
 813   return thread;
 814 }
 815 
 816 
 817 void CompileBroker::init_compiler_sweeper_threads() {
 818   EXCEPTION_MARK;
 819 #if !defined(ZERO)
 820   assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
 821 #endif // !ZERO
 822   // Initialize the compilation queue
 823   if (_c2_count > 0) {
 824     const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
 825     _c2_compile_queue  = new CompileQueue(name);
 826     _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
 827     _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
 828   }
 829   if (_c1_count > 0) {
 830     _c1_compile_queue  = new CompileQueue("C1 compile queue");
 831     _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
 832     _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
 833   }
 834 
 835   char name_buffer[256];
 836 
 837   for (int i = 0; i < _c2_count; i++) {
 838     // Create a name for our thread.
 839     sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
 840     Handle thread_oop = create_thread_oop(name_buffer, CHECK);
 841     jobject thread_handle = JNIHandles::make_global(thread_oop);
 842     _compiler2_objects[i] = thread_handle;
 843     _compiler2_logs[i] = NULL;
 844 
 845     if (!UseDynamicNumberOfCompilerThreads || i == 0) {
 846       JavaThread *ct = make_thread(thread_handle, _c2_compile_queue, _compilers[1], CHECK);
 847       assert(ct != NULL, "should have been handled for initial thread");
 848       _compilers[1]->set_num_compiler_threads(i + 1);
 849       if (TraceCompilerThreads) {
 850         ResourceMark rm;
 851         MutexLocker mu(Threads_lock);
 852         tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
 853       }
 854     }
 855   }
 856 
 857   for (int i = 0; i < _c1_count; i++) {
 858     // Create a name for our thread.
 859     sprintf(name_buffer, "C1 CompilerThread%d", i);
 860     Handle thread_oop = create_thread_oop(name_buffer, CHECK);
 861     jobject thread_handle = JNIHandles::make_global(thread_oop);
 862     _compiler1_objects[i] = thread_handle;
 863     _compiler1_logs[i] = NULL;
 864 
 865     if (!UseDynamicNumberOfCompilerThreads || i == 0) {
 866       JavaThread *ct = make_thread(thread_handle, _c1_compile_queue, _compilers[0], CHECK);
 867       assert(ct != NULL, "should have been handled for initial thread");
 868       _compilers[0]->set_num_compiler_threads(i + 1);
 869       if (TraceCompilerThreads) {
 870         ResourceMark rm;
 871         MutexLocker mu(Threads_lock);
 872         tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
 873       }
 874     }
 875   }
 876 
 877   if (UsePerfData) {
 878     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
 879   }
 880 
 881   if (MethodFlushing) {
 882     // Initialize the sweeper thread
 883     Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
 884     jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
 885     make_thread(thread_handle, NULL, NULL, CHECK);
 886   }
 887 }
 888 
 889 void CompileBroker::possibly_add_compiler_threads() {
 890   EXCEPTION_MARK;
 891 
 892   julong available_memory = os::available_memory();
 893   // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
 894   size_t available_cc_np  = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
 895          available_cc_p   = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
 896 
 897   // Only do attempt to start additional threads if the lock is free.
 898   if (!CompileThread_lock->try_lock()) return;
 899 
 900   if (_c2_compile_queue != NULL) {
 901     int old_c2_count = _compilers[1]->num_compiler_threads();
 902     int new_c2_count = MIN4(_c2_count,
 903         _c2_compile_queue->size() / 2,
 904         (int)(available_memory / (200*M)),
 905         (int)(available_cc_np / (128*K)));
 906 
 907     for (int i = old_c2_count; i < new_c2_count; i++) {
 908       JavaThread *ct = make_thread(compiler2_object(i), _c2_compile_queue, _compilers[1], CHECK);
 909       if (ct == NULL) break;
 910       _compilers[1]->set_num_compiler_threads(i + 1);
 911       if (TraceCompilerThreads) {
 912         ResourceMark rm;
 913         MutexLocker mu(Threads_lock);
 914         tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
 915                       ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
 916       }
 917     }
 918   }
 919 
 920   if (_c1_compile_queue != NULL) {
 921     int old_c1_count = _compilers[0]->num_compiler_threads();
 922     int new_c1_count = MIN4(_c1_count,
 923         _c1_compile_queue->size() / 4,
 924         (int)(available_memory / (100*M)),
 925         (int)(available_cc_p / (128*K)));
 926 
 927     for (int i = old_c1_count; i < new_c1_count; i++) {
 928       JavaThread *ct = make_thread(compiler1_object(i), _c1_compile_queue, _compilers[0], CHECK);
 929       if (ct == NULL) break;
 930       _compilers[0]->set_num_compiler_threads(i + 1);
 931       if (TraceCompilerThreads) {
 932         ResourceMark rm;
 933         MutexLocker mu(Threads_lock);
 934         tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
 935                       ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
 936       }
 937     }
 938   }
 939 
 940   CompileThread_lock->unlock();
 941 }
 942 
 943 
 944 /**
 945  * Set the methods on the stack as on_stack so that redefine classes doesn't
 946  * reclaim them. This method is executed at a safepoint.
 947  */
 948 void CompileBroker::mark_on_stack() {
 949   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
 950   // Since we are at a safepoint, we do not need a lock to access
 951   // the compile queues.
 952   if (_c2_compile_queue != NULL) {
 953     _c2_compile_queue->mark_on_stack();
 954   }
 955   if (_c1_compile_queue != NULL) {
 956     _c1_compile_queue->mark_on_stack();
 957   }
 958 }
 959 
 960 // ------------------------------------------------------------------
 961 // CompileBroker::compile_method
 962 //
 963 // Request compilation of a method.
 964 void CompileBroker::compile_method_base(const methodHandle& method,
 965                                         int osr_bci,
 966                                         int comp_level,
 967                                         const methodHandle& hot_method,
 968                                         int hot_count,
 969                                         CompileTask::CompileReason compile_reason,
 970                                         bool blocking,
 971                                         Thread* thread) {
 972   guarantee(!method->is_abstract(), "cannot compile abstract methods");
 973   assert(method->method_holder()->is_instance_klass(),
 974          "sanity check");
 975   assert(!method->method_holder()->is_not_initialized(),
 976          "method holder must be initialized");
 977   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
 978 
 979   if (CIPrintRequests) {
 980     tty->print("request: ");
 981     method->print_short_name(tty);
 982     if (osr_bci != InvocationEntryBci) {
 983       tty->print(" osr_bci: %d", osr_bci);
 984     }
 985     tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
 986     if (!hot_method.is_null()) {
 987       tty->print(" hot: ");
 988       if (hot_method() != method()) {
 989           hot_method->print_short_name(tty);
 990       } else {
 991         tty->print("yes");
 992       }
 993     }
 994     tty->cr();
 995   }
 996 
 997   // A request has been made for compilation.  Before we do any
 998   // real work, check to see if the method has been compiled
 999   // in the meantime with a definitive result.
1000   if (compilation_is_complete(method, osr_bci, comp_level)) {
1001     return;
1002   }
1003 
1004 #ifndef PRODUCT
1005   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1006     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1007       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1008       return;
1009     }
1010   }
1011 #endif
1012 
1013   // If this method is already in the compile queue, then
1014   // we do not block the current thread.
1015   if (compilation_is_in_queue(method)) {
1016     // We may want to decay our counter a bit here to prevent
1017     // multiple denied requests for compilation.  This is an
1018     // open compilation policy issue. Note: The other possibility,
1019     // in the case that this is a blocking compile request, is to have
1020     // all subsequent blocking requesters wait for completion of
1021     // ongoing compiles. Note that in this case we'll need a protocol
1022     // for freeing the associated compile tasks. [Or we could have
1023     // a single static monitor on which all these waiters sleep.]
1024     return;
1025   }
1026 
1027   if (TieredCompilation) {
1028     // Tiered policy requires MethodCounters to exist before adding a method to
1029     // the queue. Create if we don't have them yet.
1030     method->get_method_counters(thread);
1031   }
1032 
1033   // Outputs from the following MutexLocker block:
1034   CompileTask* task     = NULL;
1035   CompileQueue* queue  = compile_queue(comp_level);
1036 
1037   // Acquire our lock.
1038   {
1039     MutexLocker locker(MethodCompileQueue_lock, thread);
1040 
1041     // Make sure the method has not slipped into the queues since
1042     // last we checked; note that those checks were "fast bail-outs".
1043     // Here we need to be more careful, see 14012000 below.
1044     if (compilation_is_in_queue(method)) {
1045       return;
1046     }
1047 
1048     // We need to check again to see if the compilation has
1049     // completed.  A previous compilation may have registered
1050     // some result.
1051     if (compilation_is_complete(method, osr_bci, comp_level)) {
1052       return;
1053     }
1054 
1055     // We now know that this compilation is not pending, complete,
1056     // or prohibited.  Assign a compile_id to this compilation
1057     // and check to see if it is in our [Start..Stop) range.
1058     int compile_id = assign_compile_id(method, osr_bci);
1059     if (compile_id == 0) {
1060       // The compilation falls outside the allowed range.
1061       return;
1062     }
1063 
1064 #if INCLUDE_JVMCI
1065     if (UseJVMCICompiler && blocking) {
1066       // Don't allow blocking compiles for requests triggered by JVMCI.
1067       if (thread->is_Compiler_thread()) {
1068         blocking = false;
1069       }
1070 
1071       if (!UseJVMCINativeLibrary) {
1072         // Don't allow blocking compiles if inside a class initializer or while performing class loading
1073         vframeStream vfst((JavaThread*) thread);
1074         for (; !vfst.at_end(); vfst.next()) {
1075           if (vfst.method()->is_static_initializer() ||
1076               (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
1077                   vfst.method()->name() == vmSymbols::loadClass_name())) {
1078             blocking = false;
1079             break;
1080           }
1081         }
1082       }
1083 
1084       // Don't allow blocking compilation requests to JVMCI
1085       // if JVMCI itself is not yet initialized
1086       if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1087         blocking = false;
1088       }
1089 
1090       // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1091       // to avoid deadlock between compiler thread(s) and threads run at shutdown
1092       // such as the DestroyJavaVM thread.
1093       if (JVMCI::shutdown_called()) {
1094         blocking = false;
1095       }
1096     }
1097 #endif // INCLUDE_JVMCI
1098 
1099     // We will enter the compilation in the queue.
1100     // 14012000: Note that this sets the queued_for_compile bits in
1101     // the target method. We can now reason that a method cannot be
1102     // queued for compilation more than once, as follows:
1103     // Before a thread queues a task for compilation, it first acquires
1104     // the compile queue lock, then checks if the method's queued bits
1105     // are set or it has already been compiled. Thus there can not be two
1106     // instances of a compilation task for the same method on the
1107     // compilation queue. Consider now the case where the compilation
1108     // thread has already removed a task for that method from the queue
1109     // and is in the midst of compiling it. In this case, the
1110     // queued_for_compile bits must be set in the method (and these
1111     // will be visible to the current thread, since the bits were set
1112     // under protection of the compile queue lock, which we hold now.
1113     // When the compilation completes, the compiler thread first sets
1114     // the compilation result and then clears the queued_for_compile
1115     // bits. Neither of these actions are protected by a barrier (or done
1116     // under the protection of a lock), so the only guarantee we have
1117     // (on machines with TSO (Total Store Order)) is that these values
1118     // will update in that order. As a result, the only combinations of
1119     // these bits that the current thread will see are, in temporal order:
1120     // <RESULT, QUEUE> :
1121     //     <0, 1> : in compile queue, but not yet compiled
1122     //     <1, 1> : compiled but queue bit not cleared
1123     //     <1, 0> : compiled and queue bit cleared
1124     // Because we first check the queue bits then check the result bits,
1125     // we are assured that we cannot introduce a duplicate task.
1126     // Note that if we did the tests in the reverse order (i.e. check
1127     // result then check queued bit), we could get the result bit before
1128     // the compilation completed, and the queue bit after the compilation
1129     // completed, and end up introducing a "duplicate" (redundant) task.
1130     // In that case, the compiler thread should first check if a method
1131     // has already been compiled before trying to compile it.
1132     // NOTE: in the event that there are multiple compiler threads and
1133     // there is de-optimization/recompilation, things will get hairy,
1134     // and in that case it's best to protect both the testing (here) of
1135     // these bits, and their updating (here and elsewhere) under a
1136     // common lock.
1137     task = create_compile_task(queue,
1138                                compile_id, method,
1139                                osr_bci, comp_level,
1140                                hot_method, hot_count, compile_reason,
1141                                blocking);
1142   }
1143 
1144   if (blocking) {
1145     wait_for_completion(task);
1146   }
1147 }
1148 
1149 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1150                                        int comp_level,
1151                                        const methodHandle& hot_method, int hot_count,
1152                                        CompileTask::CompileReason compile_reason,
1153                                        Thread* THREAD) {
1154   // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1155   if (!_initialized || comp_level == CompLevel_none) {
1156     return NULL;
1157   }
1158 
1159   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1160   assert(comp != NULL, "Ensure we have a compiler");
1161 
1162   DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1163   nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1164   DirectivesStack::release(directive);
1165   return nm;
1166 }
1167 
1168 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1169                                          int comp_level,
1170                                          const methodHandle& hot_method, int hot_count,
1171                                          CompileTask::CompileReason compile_reason,
1172                                          DirectiveSet* directive,
1173                                          Thread* THREAD) {
1174 
1175   // make sure arguments make sense
1176   assert(method->method_holder()->is_instance_klass(), "not an instance method");
1177   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1178   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1179   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1180   assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level");
1181   // allow any levels for WhiteBox
1182   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1183   // return quickly if possible
1184 
1185   // lock, make sure that the compilation
1186   // isn't prohibited in a straightforward way.
1187   AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1188   if (comp == NULL || !comp->can_compile_method(method) ||
1189       compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1190     return NULL;
1191   }
1192 
1193 #if INCLUDE_JVMCI
1194   if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1195     return NULL;
1196   }
1197 #endif
1198 
1199   if (osr_bci == InvocationEntryBci) {
1200     // standard compilation
1201     CompiledMethod* method_code = method->code();
1202     if (method_code != NULL && method_code->is_nmethod()) {
1203       if (compilation_is_complete(method, osr_bci, comp_level)) {
1204         return (nmethod*) method_code;
1205       }
1206     }
1207     if (method->is_not_compilable(comp_level)) {
1208       return NULL;
1209     }
1210   } else {
1211     // osr compilation
1212 #ifndef TIERED
1213     // seems like an assert of dubious value
1214     assert(comp_level == CompLevel_highest_tier,
1215            "all OSR compiles are assumed to be at a single compilation level");
1216 #endif // TIERED
1217     // We accept a higher level osr method
1218     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1219     if (nm != NULL) return nm;
1220     if (method->is_not_osr_compilable(comp_level)) return NULL;
1221   }
1222 
1223   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1224   // some prerequisites that are compiler specific
1225   if (comp->is_c2()) {
1226     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1227     // Resolve all classes seen in the signature of the method
1228     // we are compiling.
1229     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1230   }
1231 
1232   // If the method is native, do the lookup in the thread requesting
1233   // the compilation. Native lookups can load code, which is not
1234   // permitted during compilation.
1235   //
1236   // Note: A native method implies non-osr compilation which is
1237   //       checked with an assertion at the entry of this method.
1238   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1239     bool in_base_library;
1240     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1241     if (HAS_PENDING_EXCEPTION) {
1242       // In case of an exception looking up the method, we just forget
1243       // about it. The interpreter will kick-in and throw the exception.
1244       method->set_not_compilable(); // implies is_not_osr_compilable()
1245       CLEAR_PENDING_EXCEPTION;
1246       return NULL;
1247     }
1248     assert(method->has_native_function(), "must have native code by now");
1249   }
1250 
1251   // RedefineClasses() has replaced this method; just return
1252   if (method->is_old()) {
1253     return NULL;
1254   }
1255 
1256   // JVMTI -- post_compile_event requires jmethod_id() that may require
1257   // a lock the compiling thread can not acquire. Prefetch it here.
1258   if (JvmtiExport::should_post_compiled_method_load()) {
1259     method->jmethod_id();
1260   }
1261 
1262   // do the compilation
1263   if (method->is_native()) {
1264     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1265       // The following native methods:
1266       //
1267       // java.lang.Float.intBitsToFloat
1268       // java.lang.Float.floatToRawIntBits
1269       // java.lang.Double.longBitsToDouble
1270       // java.lang.Double.doubleToRawLongBits
1271       //
1272       // are called through the interpreter even if interpreter native stubs
1273       // are not preferred (i.e., calling through adapter handlers is preferred).
1274       // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1275       // if the version of the methods from the native libraries is called.
1276       // As the interpreter and the C2-intrinsified version of the methods preserves
1277       // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1278       if ((UseSSE >= 1 &&
1279           (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1280            method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1281           (UseSSE >= 2 &&
1282            (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1283             method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1284         return NULL;
1285       }
1286 
1287       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1288       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1289       //
1290       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1291       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1292       AdapterHandlerLibrary::create_native_wrapper(method);
1293     } else {
1294       return NULL;
1295     }
1296   } else {
1297     // If the compiler is shut off due to code cache getting full
1298     // fail out now so blocking compiles dont hang the java thread
1299     if (!should_compile_new_jobs()) {
1300       CompilationPolicy::policy()->delay_compilation(method());
1301       return NULL;
1302     }
1303     bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1304     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1305   }
1306 
1307   // return requested nmethod
1308   // We accept a higher level osr method
1309   if (osr_bci == InvocationEntryBci) {
1310     CompiledMethod* code = method->code();
1311     if (code == NULL) {
1312       return (nmethod*) code;
1313     } else {
1314       return code->as_nmethod_or_null();
1315     }
1316   }
1317   return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1318 }
1319 
1320 
1321 // ------------------------------------------------------------------
1322 // CompileBroker::compilation_is_complete
1323 //
1324 // See if compilation of this method is already complete.
1325 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1326                                             int                 osr_bci,
1327                                             int                 comp_level) {
1328   bool is_osr = (osr_bci != standard_entry_bci);
1329   if (is_osr) {
1330     if (method->is_not_osr_compilable(comp_level)) {
1331       return true;
1332     } else {
1333       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1334       return (result != NULL);
1335     }
1336   } else {
1337     if (method->is_not_compilable(comp_level)) {
1338       return true;
1339     } else {
1340       CompiledMethod* result = method->code();
1341       if (result == NULL) return false;
1342       return comp_level == result->comp_level();
1343     }
1344   }
1345 }
1346 
1347 
1348 /**
1349  * See if this compilation is already requested.
1350  *
1351  * Implementation note: there is only a single "is in queue" bit
1352  * for each method.  This means that the check below is overly
1353  * conservative in the sense that an osr compilation in the queue
1354  * will block a normal compilation from entering the queue (and vice
1355  * versa).  This can be remedied by a full queue search to disambiguate
1356  * cases.  If it is deemed profitable, this may be done.
1357  */
1358 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1359   return method->queued_for_compilation();
1360 }
1361 
1362 // ------------------------------------------------------------------
1363 // CompileBroker::compilation_is_prohibited
1364 //
1365 // See if this compilation is not allowed.
1366 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1367   bool is_native = method->is_native();
1368   // Some compilers may not support the compilation of natives.
1369   AbstractCompiler *comp = compiler(comp_level);
1370   if (is_native &&
1371       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1372     method->set_not_compilable_quietly(comp_level);
1373     return true;
1374   }
1375 
1376   bool is_osr = (osr_bci != standard_entry_bci);
1377   // Some compilers may not support on stack replacement.
1378   if (is_osr &&
1379       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1380     method->set_not_osr_compilable(comp_level);
1381     return true;
1382   }
1383 
1384   // The method may be explicitly excluded by the user.
1385   double scale;
1386   if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1387     bool quietly = CompilerOracle::should_exclude_quietly();
1388     if (PrintCompilation && !quietly) {
1389       // This does not happen quietly...
1390       ResourceMark rm;
1391       tty->print("### Excluding %s:%s",
1392                  method->is_native() ? "generation of native wrapper" : "compile",
1393                  (method->is_static() ? " static" : ""));
1394       method->print_short_name(tty);
1395       tty->cr();
1396     }
1397     method->set_not_compilable(comp_level, !quietly, "excluded by CompileCommand");
1398   }
1399 
1400   return false;
1401 }
1402 
1403 /**
1404  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1405  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1406  * The function also allows to generate separate compilation IDs for OSR compilations.
1407  */
1408 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1409 #ifdef ASSERT
1410   bool is_osr = (osr_bci != standard_entry_bci);
1411   int id;
1412   if (method->is_native()) {
1413     assert(!is_osr, "can't be osr");
1414     // Adapters, native wrappers and method handle intrinsics
1415     // should be generated always.
1416     return Atomic::add(1, &_compilation_id);
1417   } else if (CICountOSR && is_osr) {
1418     id = Atomic::add(1, &_osr_compilation_id);
1419     if (CIStartOSR <= id && id < CIStopOSR) {
1420       return id;
1421     }
1422   } else {
1423     id = Atomic::add(1, &_compilation_id);
1424     if (CIStart <= id && id < CIStop) {
1425       return id;
1426     }
1427   }
1428 
1429   // Method was not in the appropriate compilation range.
1430   method->set_not_compilable_quietly();
1431   return 0;
1432 #else
1433   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1434   // only _compilation_id is incremented.
1435   return Atomic::add(1, &_compilation_id);
1436 #endif
1437 }
1438 
1439 // ------------------------------------------------------------------
1440 // CompileBroker::assign_compile_id_unlocked
1441 //
1442 // Public wrapper for assign_compile_id that acquires the needed locks
1443 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1444   MutexLocker locker(MethodCompileQueue_lock, thread);
1445   return assign_compile_id(method, osr_bci);
1446 }
1447 
1448 // ------------------------------------------------------------------
1449 // CompileBroker::preload_classes
1450 void CompileBroker::preload_classes(const methodHandle& method, TRAPS) {
1451   // Move this code over from c1_Compiler.cpp
1452   ShouldNotReachHere();
1453 }
1454 
1455 
1456 // ------------------------------------------------------------------
1457 // CompileBroker::create_compile_task
1458 //
1459 // Create a CompileTask object representing the current request for
1460 // compilation.  Add this task to the queue.
1461 CompileTask* CompileBroker::create_compile_task(CompileQueue*       queue,
1462                                                 int                 compile_id,
1463                                                 const methodHandle& method,
1464                                                 int                 osr_bci,
1465                                                 int                 comp_level,
1466                                                 const methodHandle& hot_method,
1467                                                 int                 hot_count,
1468                                                 CompileTask::CompileReason compile_reason,
1469                                                 bool                blocking) {
1470   CompileTask* new_task = CompileTask::allocate();
1471   new_task->initialize(compile_id, method, osr_bci, comp_level,
1472                        hot_method, hot_count, compile_reason,
1473                        blocking);
1474   queue->add(new_task);
1475   return new_task;
1476 }
1477 
1478 #if INCLUDE_JVMCI
1479 // The number of milliseconds to wait before checking if
1480 // JVMCI compilation has made progress.
1481 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1482 
1483 // The number of JVMCI compilation progress checks that must fail
1484 // before unblocking a thread waiting for a blocking compilation.
1485 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1486 
1487 /**
1488  * Waits for a JVMCI compiler to complete a given task. This thread
1489  * waits until either the task completes or it sees no JVMCI compilation
1490  * progress for N consecutive milliseconds where N is
1491  * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1492  * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1493  *
1494  * @return true if this thread needs to free/recycle the task
1495  */
1496 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1497   MonitorLocker ml(task->lock(), thread);
1498   int progress_wait_attempts = 0;
1499   int methods_compiled = jvmci->methods_compiled();
1500   while (!task->is_complete() && !is_compilation_disabled_forever() &&
1501          ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1502     CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1503 
1504     bool progress;
1505     if (jvmci_compiler_thread != NULL) {
1506       // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress.
1507       progress = jvmci_compiler_thread->thread_state() != _thread_blocked &&
1508         !jvmci_compiler_thread->is_external_suspend();
1509     } else {
1510       // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1511       // that all JVMCI compiler threads are blocked on. We use the counter for
1512       // successful JVMCI compilations to determine whether JVMCI compilation
1513       // is still making progress through the JVMCI compiler queue.
1514       progress = jvmci->methods_compiled() != methods_compiled;
1515     }
1516 
1517     if (!progress) {
1518       if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1519         if (PrintCompilation) {
1520           task->print(tty, "wait for blocking compilation timed out");
1521         }
1522         break;
1523       }
1524     } else {
1525       progress_wait_attempts = 0;
1526       if (jvmci_compiler_thread == NULL) {
1527         methods_compiled = jvmci->methods_compiled();
1528       }
1529     }
1530   }
1531   task->clear_waiter();
1532   return task->is_complete();
1533 }
1534 #endif
1535 
1536 /**
1537  *  Wait for the compilation task to complete.
1538  */
1539 void CompileBroker::wait_for_completion(CompileTask* task) {
1540   if (CIPrintCompileQueue) {
1541     ttyLocker ttyl;
1542     tty->print_cr("BLOCKING FOR COMPILE");
1543   }
1544 
1545   assert(task->is_blocking(), "can only wait on blocking task");
1546 
1547   JavaThread* thread = JavaThread::current();
1548   thread->set_blocked_on_compilation(true);
1549 
1550   methodHandle method(thread, task->method());
1551   bool free_task;
1552 #if INCLUDE_JVMCI
1553   AbstractCompiler* comp = compiler(task->comp_level());
1554   if (comp->is_jvmci()) {
1555     free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1556   } else
1557 #endif
1558   {
1559     MonitorLocker ml(task->lock(), thread);
1560     free_task = true;
1561     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1562       ml.wait();
1563     }
1564   }
1565 
1566   thread->set_blocked_on_compilation(false);
1567   if (free_task) {
1568     if (is_compilation_disabled_forever()) {
1569       CompileTask::free(task);
1570       return;
1571     }
1572 
1573     // It is harmless to check this status without the lock, because
1574     // completion is a stable property (until the task object is recycled).
1575     assert(task->is_complete(), "Compilation should have completed");
1576     assert(task->code_handle() == NULL, "must be reset");
1577 
1578     // By convention, the waiter is responsible for recycling a
1579     // blocking CompileTask. Since there is only one waiter ever
1580     // waiting on a CompileTask, we know that no one else will
1581     // be using this CompileTask; we can free it.
1582     CompileTask::free(task);
1583   }
1584 }
1585 
1586 /**
1587  * Initialize compiler thread(s) + compiler object(s). The postcondition
1588  * of this function is that the compiler runtimes are initialized and that
1589  * compiler threads can start compiling.
1590  */
1591 bool CompileBroker::init_compiler_runtime() {
1592   CompilerThread* thread = CompilerThread::current();
1593   AbstractCompiler* comp = thread->compiler();
1594   // Final sanity check - the compiler object must exist
1595   guarantee(comp != NULL, "Compiler object must exist");
1596 
1597   int system_dictionary_modification_counter;
1598   {
1599     MutexLocker locker(Compile_lock, thread);
1600     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1601   }
1602 
1603   {
1604     // Must switch to native to allocate ci_env
1605     ThreadToNativeFromVM ttn(thread);
1606     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1607     // Cache Jvmti state
1608     ci_env.cache_jvmti_state();
1609     // Cache DTrace flags
1610     ci_env.cache_dtrace_flags();
1611 
1612     // Switch back to VM state to do compiler initialization
1613     ThreadInVMfromNative tv(thread);
1614     ResetNoHandleMark rnhm;
1615 
1616     // Perform per-thread and global initializations
1617     comp->initialize();
1618   }
1619 
1620   if (comp->is_failed()) {
1621     disable_compilation_forever();
1622     // If compiler initialization failed, no compiler thread that is specific to a
1623     // particular compiler runtime will ever start to compile methods.
1624     shutdown_compiler_runtime(comp, thread);
1625     return false;
1626   }
1627 
1628   // C1 specific check
1629   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1630     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1631     return false;
1632   }
1633 
1634   return true;
1635 }
1636 
1637 /**
1638  * If C1 and/or C2 initialization failed, we shut down all compilation.
1639  * We do this to keep things simple. This can be changed if it ever turns
1640  * out to be a problem.
1641  */
1642 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1643   // Free buffer blob, if allocated
1644   if (thread->get_buffer_blob() != NULL) {
1645     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1646     CodeCache::free(thread->get_buffer_blob());
1647   }
1648 
1649   if (comp->should_perform_shutdown()) {
1650     // There are two reasons for shutting down the compiler
1651     // 1) compiler runtime initialization failed
1652     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1653     warning("%s initialization failed. Shutting down all compilers", comp->name());
1654 
1655     // Only one thread per compiler runtime object enters here
1656     // Set state to shut down
1657     comp->set_shut_down();
1658 
1659     // Delete all queued compilation tasks to make compiler threads exit faster.
1660     if (_c1_compile_queue != NULL) {
1661       _c1_compile_queue->free_all();
1662     }
1663 
1664     if (_c2_compile_queue != NULL) {
1665       _c2_compile_queue->free_all();
1666     }
1667 
1668     // Set flags so that we continue execution with using interpreter only.
1669     UseCompiler    = false;
1670     UseInterpreter = true;
1671 
1672     // We could delete compiler runtimes also. However, there are references to
1673     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1674     // fail. This can be done later if necessary.
1675   }
1676 }
1677 
1678 /**
1679  * Helper function to create new or reuse old CompileLog.
1680  */
1681 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1682   if (!LogCompilation) return NULL;
1683 
1684   AbstractCompiler *compiler = ct->compiler();
1685   bool c1 = compiler->is_c1();
1686   jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1687   assert(compiler_objects != NULL, "must be initialized at this point");
1688   CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1689   assert(logs != NULL, "must be initialized at this point");
1690   int count = c1 ? _c1_count : _c2_count;
1691 
1692   // Find Compiler number by its threadObj.
1693   oop compiler_obj = ct->threadObj();
1694   int compiler_number = 0;
1695   bool found = false;
1696   for (; compiler_number < count; compiler_number++) {
1697     if (oopDesc::equals(JNIHandles::resolve_non_null(compiler_objects[compiler_number]), compiler_obj)) {
1698       found = true;
1699       break;
1700     }
1701   }
1702   assert(found, "Compiler must exist at this point");
1703 
1704   // Determine pointer for this thread's log.
1705   CompileLog** log_ptr = &logs[compiler_number];
1706 
1707   // Return old one if it exists.
1708   CompileLog* log = *log_ptr;
1709   if (log != NULL) {
1710     ct->init_log(log);
1711     return log;
1712   }
1713 
1714   // Create a new one and remember it.
1715   init_compiler_thread_log();
1716   log = ct->log();
1717   *log_ptr = log;
1718   return log;
1719 }
1720 
1721 // ------------------------------------------------------------------
1722 // CompileBroker::compiler_thread_loop
1723 //
1724 // The main loop run by a CompilerThread.
1725 void CompileBroker::compiler_thread_loop() {
1726   CompilerThread* thread = CompilerThread::current();
1727   CompileQueue* queue = thread->queue();
1728   // For the thread that initializes the ciObjectFactory
1729   // this resource mark holds all the shared objects
1730   ResourceMark rm;
1731 
1732   // First thread to get here will initialize the compiler interface
1733 
1734   {
1735     ASSERT_IN_VM;
1736     MutexLocker only_one (CompileThread_lock, thread);
1737     if (!ciObjectFactory::is_initialized()) {
1738       ciObjectFactory::initialize();
1739     }
1740   }
1741 
1742   // Open a log.
1743   CompileLog* log = get_log(thread);
1744   if (log != NULL) {
1745     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1746                     thread->name(),
1747                     os::current_thread_id(),
1748                     os::current_process_id());
1749     log->stamp();
1750     log->end_elem();
1751   }
1752 
1753   // If compiler thread/runtime initialization fails, exit the compiler thread
1754   if (!init_compiler_runtime()) {
1755     return;
1756   }
1757 
1758   thread->start_idle_timer();
1759 
1760   // Poll for new compilation tasks as long as the JVM runs. Compilation
1761   // should only be disabled if something went wrong while initializing the
1762   // compiler runtimes. This, in turn, should not happen. The only known case
1763   // when compiler runtime initialization fails is if there is not enough free
1764   // space in the code cache to generate the necessary stubs, etc.
1765   while (!is_compilation_disabled_forever()) {
1766     // We need this HandleMark to avoid leaking VM handles.
1767     HandleMark hm(thread);
1768 
1769     CompileTask* task = queue->get();
1770     if (task == NULL) {
1771       if (UseDynamicNumberOfCompilerThreads) {
1772         // Access compiler_count under lock to enforce consistency.
1773         MutexLocker only_one(CompileThread_lock);
1774         if (can_remove(thread, true)) {
1775           if (TraceCompilerThreads) {
1776             tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1777                           thread->name(), thread->idle_time_millis());
1778           }
1779           // Free buffer blob, if allocated
1780           if (thread->get_buffer_blob() != NULL) {
1781             MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1782             CodeCache::free(thread->get_buffer_blob());
1783           }
1784           return; // Stop this thread.
1785         }
1786       }
1787     } else {
1788       // Assign the task to the current thread.  Mark this compilation
1789       // thread as active for the profiler.
1790       // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1791       // occurs after fetching the compile task off the queue.
1792       CompileTaskWrapper ctw(task);
1793       nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1794       task->set_code_handle(&result_handle);
1795       methodHandle method(thread, task->method());
1796 
1797       // Never compile a method if breakpoints are present in it
1798       if (method()->number_of_breakpoints() == 0) {
1799         // Compile the method.
1800         if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1801           invoke_compiler_on_method(task);
1802           thread->start_idle_timer();
1803         } else {
1804           // After compilation is disabled, remove remaining methods from queue
1805           method->clear_queued_for_compilation();
1806           task->set_failure_reason("compilation is disabled");
1807         }
1808       }
1809 
1810       if (UseDynamicNumberOfCompilerThreads) {
1811         possibly_add_compiler_threads();
1812       }
1813     }
1814   }
1815 
1816   // Shut down compiler runtime
1817   shutdown_compiler_runtime(thread->compiler(), thread);
1818 }
1819 
1820 // ------------------------------------------------------------------
1821 // CompileBroker::init_compiler_thread_log
1822 //
1823 // Set up state required by +LogCompilation.
1824 void CompileBroker::init_compiler_thread_log() {
1825     CompilerThread* thread = CompilerThread::current();
1826     char  file_name[4*K];
1827     FILE* fp = NULL;
1828     intx thread_id = os::current_thread_id();
1829     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1830       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1831       if (dir == NULL) {
1832         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1833                      thread_id, os::current_process_id());
1834       } else {
1835         jio_snprintf(file_name, sizeof(file_name),
1836                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1837                      os::file_separator(), thread_id, os::current_process_id());
1838       }
1839 
1840       fp = fopen(file_name, "wt");
1841       if (fp != NULL) {
1842         if (LogCompilation && Verbose) {
1843           tty->print_cr("Opening compilation log %s", file_name);
1844         }
1845         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1846         if (log == NULL) {
1847           fclose(fp);
1848           return;
1849         }
1850         thread->init_log(log);
1851 
1852         if (xtty != NULL) {
1853           ttyLocker ttyl;
1854           // Record any per thread log files
1855           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1856         }
1857         return;
1858       }
1859     }
1860     warning("Cannot open log file: %s", file_name);
1861 }
1862 
1863 void CompileBroker::log_metaspace_failure() {
1864   const char* message = "some methods may not be compiled because metaspace "
1865                         "is out of memory";
1866   if (_compilation_log != NULL) {
1867     _compilation_log->log_metaspace_failure(message);
1868   }
1869   if (PrintCompilation) {
1870     tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1871   }
1872 }
1873 
1874 
1875 // ------------------------------------------------------------------
1876 // CompileBroker::set_should_block
1877 //
1878 // Set _should_block.
1879 // Call this from the VM, with Threads_lock held and a safepoint requested.
1880 void CompileBroker::set_should_block() {
1881   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1882   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1883 #ifndef PRODUCT
1884   if (PrintCompilation && (Verbose || WizardMode))
1885     tty->print_cr("notifying compiler thread pool to block");
1886 #endif
1887   _should_block = true;
1888 }
1889 
1890 // ------------------------------------------------------------------
1891 // CompileBroker::maybe_block
1892 //
1893 // Call this from the compiler at convenient points, to poll for _should_block.
1894 void CompileBroker::maybe_block() {
1895   if (_should_block) {
1896 #ifndef PRODUCT
1897     if (PrintCompilation && (Verbose || WizardMode))
1898       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1899 #endif
1900     ThreadInVMfromNative tivfn(JavaThread::current());
1901   }
1902 }
1903 
1904 // wrapper for CodeCache::print_summary()
1905 static void codecache_print(bool detailed)
1906 {
1907   ResourceMark rm;
1908   stringStream s;
1909   // Dump code cache  into a buffer before locking the tty,
1910   {
1911     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1912     CodeCache::print_summary(&s, detailed);
1913   }
1914   ttyLocker ttyl;
1915   tty->print("%s", s.as_string());
1916 }
1917 
1918 // wrapper for CodeCache::print_summary() using outputStream
1919 static void codecache_print(outputStream* out, bool detailed) {
1920   ResourceMark rm;
1921   stringStream s;
1922 
1923   // Dump code cache into a buffer
1924   {
1925     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1926     CodeCache::print_summary(&s, detailed);
1927   }
1928 
1929   char* remaining_log = s.as_string();
1930   while (*remaining_log != '\0') {
1931     char* eol = strchr(remaining_log, '\n');
1932     if (eol == NULL) {
1933       out->print_cr("%s", remaining_log);
1934       remaining_log = remaining_log + strlen(remaining_log);
1935     } else {
1936       *eol = '\0';
1937       out->print_cr("%s", remaining_log);
1938       remaining_log = eol + 1;
1939     }
1940   }
1941 }
1942 
1943 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
1944                                  int compilable, const char* failure_reason) {
1945   if (success) {
1946     task->mark_success();
1947     if (ci_env != NULL) {
1948       task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
1949     }
1950     if (_compilation_log != NULL) {
1951       nmethod* code = task->code();
1952       if (code != NULL) {
1953         _compilation_log->log_nmethod(thread, code);
1954       }
1955     }
1956   } else if (AbortVMOnCompilationFailure) {
1957     if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1958       fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
1959     }
1960     if (compilable == ciEnv::MethodCompilable_never) {
1961       fatal("Never compilable: %s", failure_reason);
1962     }
1963   }
1964   // simulate crash during compilation
1965   assert(task->compile_id() != CICrashAt, "just as planned");
1966 }
1967 
1968 static void post_compilation_event(EventCompilation* event, CompileTask* task) {
1969   assert(event != NULL, "invariant");
1970   assert(event->should_commit(), "invariant");
1971   event->set_method(task->method());
1972   event->set_compileId(task->compile_id());
1973   event->set_compileLevel(task->comp_level());
1974   event->set_succeded(task->is_success());
1975   event->set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
1976   event->set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1977   event->set_inlinedBytes(task->num_inlined_bytecodes());
1978   event->commit();
1979 }
1980 
1981 int DirectivesStack::_depth = 0;
1982 CompilerDirectives* DirectivesStack::_top = NULL;
1983 CompilerDirectives* DirectivesStack::_bottom = NULL;
1984 
1985 // ------------------------------------------------------------------
1986 // CompileBroker::invoke_compiler_on_method
1987 //
1988 // Compile a method.
1989 //
1990 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1991   task->print_ul();
1992   if (PrintCompilation) {
1993     ResourceMark rm;
1994     task->print_tty();
1995   }
1996   elapsedTimer time;
1997 
1998   CompilerThread* thread = CompilerThread::current();
1999   ResourceMark rm(thread);
2000 
2001   if (LogEvents) {
2002     _compilation_log->log_compile(thread, task);
2003   }
2004 
2005   // Common flags.
2006   uint compile_id = task->compile_id();
2007   int osr_bci = task->osr_bci();
2008   bool is_osr = (osr_bci != standard_entry_bci);
2009   bool should_log = (thread->log() != NULL);
2010   bool should_break = false;
2011   const int task_level = task->comp_level();
2012   AbstractCompiler* comp = task->compiler();
2013 
2014   DirectiveSet* directive;
2015   {
2016     // create the handle inside it's own block so it can't
2017     // accidentally be referenced once the thread transitions to
2018     // native.  The NoHandleMark before the transition should catch
2019     // any cases where this occurs in the future.
2020     methodHandle method(thread, task->method());
2021     assert(!method->is_native(), "no longer compile natives");
2022 
2023     // Look up matching directives
2024     directive = DirectivesStack::getMatchingDirective(method, comp);
2025 
2026     // Update compile information when using perfdata.
2027     if (UsePerfData) {
2028       update_compile_perf_data(thread, method, is_osr);
2029     }
2030 
2031     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2032   }
2033 
2034   should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
2035   if (should_log && !directive->LogOption) {
2036     should_log = false;
2037   }
2038 
2039   // Allocate a new set of JNI handles.
2040   push_jni_handle_block();
2041   Method* target_handle = task->method();
2042   int compilable = ciEnv::MethodCompilable;
2043   const char* failure_reason = NULL;
2044   bool failure_reason_on_C_heap = false;
2045   const char* retry_message = NULL;
2046 
2047   int system_dictionary_modification_counter;
2048   {
2049     MutexLocker locker(Compile_lock, thread);
2050     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
2051   }
2052 
2053 #if INCLUDE_JVMCI
2054   if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2055     JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2056 
2057     TraceTime t1("compilation", &time);
2058     EventCompilation event;
2059 
2060     // Skip redefined methods
2061     if (target_handle->is_old()) {
2062       failure_reason = "redefined method";
2063       retry_message = "not retryable";
2064       compilable = ciEnv::MethodCompilable_never;
2065     } else {
2066       JVMCICompileState compile_state(task, system_dictionary_modification_counter);
2067       JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2068       methodHandle method(thread, target_handle);
2069       env.runtime()->compile_method(&env, jvmci, method, osr_bci);
2070 
2071       failure_reason = compile_state.failure_reason();
2072       failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2073       if (!compile_state.retryable()) {
2074         retry_message = "not retryable";
2075         compilable = ciEnv::MethodCompilable_not_at_tier;
2076       }
2077       if (task->code() == NULL) {
2078         assert(failure_reason != NULL, "must specify failure_reason");
2079       }
2080     }
2081     post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2082     if (event.should_commit()) {
2083       post_compilation_event(&event, task);
2084     }
2085 
2086   } else
2087 #endif // INCLUDE_JVMCI
2088   {
2089     NoHandleMark  nhm;
2090     ThreadToNativeFromVM ttn(thread);
2091 
2092     ciEnv ci_env(task, system_dictionary_modification_counter);
2093     if (should_break) {
2094       ci_env.set_break_at_compile(true);
2095     }
2096     if (should_log) {
2097       ci_env.set_log(thread->log());
2098     }
2099     assert(thread->env() == &ci_env, "set by ci_env");
2100     // The thread-env() field is cleared in ~CompileTaskWrapper.
2101 
2102     // Cache Jvmti state
2103     ci_env.cache_jvmti_state();
2104 
2105     // Cache DTrace flags
2106     ci_env.cache_dtrace_flags();
2107 
2108     ciMethod* target = ci_env.get_method_from_handle(target_handle);
2109 
2110     TraceTime t1("compilation", &time);
2111     EventCompilation event;
2112 
2113     if (comp == NULL) {
2114       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2115     } else {
2116       if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2117         MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2118         while (WhiteBox::compilation_locked) {
2119           locker.wait();
2120         }
2121       }
2122       comp->compile_method(&ci_env, target, osr_bci, directive);
2123     }
2124 
2125     if (!ci_env.failing() && task->code() == NULL) {
2126       //assert(false, "compiler should always document failure");
2127       // The compiler elected, without comment, not to register a result.
2128       // Do not attempt further compilations of this method.
2129       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2130     }
2131 
2132     // Copy this bit to the enclosing block:
2133     compilable = ci_env.compilable();
2134 
2135     if (ci_env.failing()) {
2136       failure_reason = ci_env.failure_reason();
2137       retry_message = ci_env.retry_message();
2138       ci_env.report_failure(failure_reason);
2139     }
2140 
2141     post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2142     if (event.should_commit()) {
2143       post_compilation_event(&event, task);
2144     }
2145   }
2146   // Remove the JNI handle block after the ciEnv destructor has run in
2147   // the previous block.
2148   pop_jni_handle_block();
2149 
2150   if (failure_reason != NULL) {
2151     task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2152     if (_compilation_log != NULL) {
2153       _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2154     }
2155     if (PrintCompilation) {
2156       FormatBufferResource msg = retry_message != NULL ?
2157         FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2158         FormatBufferResource("COMPILE SKIPPED: %s",      failure_reason);
2159       task->print(tty, msg);
2160     }
2161   }
2162 
2163   methodHandle method(thread, task->method());
2164 
2165   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2166 
2167   collect_statistics(thread, time, task);
2168 
2169   nmethod* nm = task->code();
2170   if (nm != NULL) {
2171     nm->maybe_print_nmethod(directive);
2172   }
2173   DirectivesStack::release(directive);
2174 
2175   if (PrintCompilation && PrintCompilation2) {
2176     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
2177     tty->print("%4d ", compile_id);    // print compilation number
2178     tty->print("%s ", (is_osr ? "%" : " "));
2179     if (task->code() != NULL) {
2180       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2181     }
2182     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2183   }
2184 
2185   Log(compilation, codecache) log;
2186   if (log.is_debug()) {
2187     LogStream ls(log.debug());
2188     codecache_print(&ls, /* detailed= */ false);
2189   }
2190   if (PrintCodeCacheOnCompilation) {
2191     codecache_print(/* detailed= */ false);
2192   }
2193   // Disable compilation, if required.
2194   switch (compilable) {
2195   case ciEnv::MethodCompilable_never:
2196     if (is_osr)
2197       method->set_not_osr_compilable_quietly();
2198     else
2199       method->set_not_compilable_quietly();
2200     break;
2201   case ciEnv::MethodCompilable_not_at_tier:
2202     if (is_osr)
2203       method->set_not_osr_compilable_quietly(task_level);
2204     else
2205       method->set_not_compilable_quietly(task_level);
2206     break;
2207   }
2208 
2209   // Note that the queued_for_compilation bits are cleared without
2210   // protection of a mutex. [They were set by the requester thread,
2211   // when adding the task to the compile queue -- at which time the
2212   // compile queue lock was held. Subsequently, we acquired the compile
2213   // queue lock to get this task off the compile queue; thus (to belabour
2214   // the point somewhat) our clearing of the bits must be occurring
2215   // only after the setting of the bits. See also 14012000 above.
2216   method->clear_queued_for_compilation();
2217 }
2218 
2219 /**
2220  * The CodeCache is full. Print warning and disable compilation.
2221  * Schedule code cache cleaning so compilation can continue later.
2222  * This function needs to be called only from CodeCache::allocate(),
2223  * since we currently handle a full code cache uniformly.
2224  */
2225 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2226   UseInterpreter = true;
2227   if (UseCompiler || AlwaysCompileLoopMethods ) {
2228     if (xtty != NULL) {
2229       ResourceMark rm;
2230       stringStream s;
2231       // Dump code cache state into a buffer before locking the tty,
2232       // because log_state() will use locks causing lock conflicts.
2233       CodeCache::log_state(&s);
2234       // Lock to prevent tearing
2235       ttyLocker ttyl;
2236       xtty->begin_elem("code_cache_full");
2237       xtty->print("%s", s.as_string());
2238       xtty->stamp();
2239       xtty->end_elem();
2240     }
2241 
2242 #ifndef PRODUCT
2243     if (ExitOnFullCodeCache) {
2244       codecache_print(/* detailed= */ true);
2245       before_exit(JavaThread::current());
2246       exit_globals(); // will delete tty
2247       vm_direct_exit(1);
2248     }
2249 #endif
2250     if (UseCodeCacheFlushing) {
2251       // Since code cache is full, immediately stop new compiles
2252       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2253         NMethodSweeper::log_sweep("disable_compiler");
2254       }
2255     } else {
2256       disable_compilation_forever();
2257     }
2258 
2259     CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2260   }
2261 }
2262 
2263 // ------------------------------------------------------------------
2264 // CompileBroker::update_compile_perf_data
2265 //
2266 // Record this compilation for debugging purposes.
2267 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2268   ResourceMark rm;
2269   char* method_name = method->name()->as_C_string();
2270   char current_method[CompilerCounters::cmname_buffer_length];
2271   size_t maxLen = CompilerCounters::cmname_buffer_length;
2272 
2273   const char* class_name = method->method_holder()->name()->as_C_string();
2274 
2275   size_t s1len = strlen(class_name);
2276   size_t s2len = strlen(method_name);
2277 
2278   // check if we need to truncate the string
2279   if (s1len + s2len + 2 > maxLen) {
2280 
2281     // the strategy is to lop off the leading characters of the
2282     // class name and the trailing characters of the method name.
2283 
2284     if (s2len + 2 > maxLen) {
2285       // lop of the entire class name string, let snprintf handle
2286       // truncation of the method name.
2287       class_name += s1len; // null string
2288     }
2289     else {
2290       // lop off the extra characters from the front of the class name
2291       class_name += ((s1len + s2len + 2) - maxLen);
2292     }
2293   }
2294 
2295   jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2296 
2297   int last_compile_type = normal_compile;
2298   if (CICountOSR && is_osr) {
2299     last_compile_type = osr_compile;
2300   }
2301 
2302   CompilerCounters* counters = thread->counters();
2303   counters->set_current_method(current_method);
2304   counters->set_compile_type((jlong) last_compile_type);
2305 }
2306 
2307 // ------------------------------------------------------------------
2308 // CompileBroker::push_jni_handle_block
2309 //
2310 // Push on a new block of JNI handles.
2311 void CompileBroker::push_jni_handle_block() {
2312   JavaThread* thread = JavaThread::current();
2313 
2314   // Allocate a new block for JNI handles.
2315   // Inlined code from jni_PushLocalFrame()
2316   JNIHandleBlock* java_handles = thread->active_handles();
2317   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2318   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2319   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2320   thread->set_active_handles(compile_handles);
2321 }
2322 
2323 
2324 // ------------------------------------------------------------------
2325 // CompileBroker::pop_jni_handle_block
2326 //
2327 // Pop off the current block of JNI handles.
2328 void CompileBroker::pop_jni_handle_block() {
2329   JavaThread* thread = JavaThread::current();
2330 
2331   // Release our JNI handle block
2332   JNIHandleBlock* compile_handles = thread->active_handles();
2333   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2334   thread->set_active_handles(java_handles);
2335   compile_handles->set_pop_frame_link(NULL);
2336   JNIHandleBlock::release_block(compile_handles, thread); // may block
2337 }
2338 
2339 // ------------------------------------------------------------------
2340 // CompileBroker::collect_statistics
2341 //
2342 // Collect statistics about the compilation.
2343 
2344 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2345   bool success = task->is_success();
2346   methodHandle method (thread, task->method());
2347   uint compile_id = task->compile_id();
2348   bool is_osr = (task->osr_bci() != standard_entry_bci);
2349   nmethod* code = task->code();
2350   CompilerCounters* counters = thread->counters();
2351 
2352   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2353   MutexLocker locker(CompileStatistics_lock);
2354 
2355   // _perf variables are production performance counters which are
2356   // updated regardless of the setting of the CITime and CITimeEach flags
2357   //
2358 
2359   // account all time, including bailouts and failures in this counter;
2360   // C1 and C2 counters are counting both successful and unsuccessful compiles
2361   _t_total_compilation.add(time);
2362 
2363   if (!success) {
2364     _total_bailout_count++;
2365     if (UsePerfData) {
2366       _perf_last_failed_method->set_value(counters->current_method());
2367       _perf_last_failed_type->set_value(counters->compile_type());
2368       _perf_total_bailout_count->inc();
2369     }
2370     _t_bailedout_compilation.add(time);
2371   } else if (code == NULL) {
2372     if (UsePerfData) {
2373       _perf_last_invalidated_method->set_value(counters->current_method());
2374       _perf_last_invalidated_type->set_value(counters->compile_type());
2375       _perf_total_invalidated_count->inc();
2376     }
2377     _total_invalidated_count++;
2378     _t_invalidated_compilation.add(time);
2379   } else {
2380     // Compilation succeeded
2381 
2382     // update compilation ticks - used by the implementation of
2383     // java.lang.management.CompilationMBean
2384     _perf_total_compilation->inc(time.ticks());
2385     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2386 
2387     if (CITime) {
2388       int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2389       if (is_osr) {
2390         _t_osr_compilation.add(time);
2391         _sum_osr_bytes_compiled += bytes_compiled;
2392       } else {
2393         _t_standard_compilation.add(time);
2394         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2395       }
2396 
2397 #if INCLUDE_JVMCI
2398       AbstractCompiler* comp = compiler(task->comp_level());
2399       if (comp) {
2400         CompilerStatistics* stats = comp->stats();
2401         if (stats) {
2402           if (is_osr) {
2403             stats->_osr.update(time, bytes_compiled);
2404           } else {
2405             stats->_standard.update(time, bytes_compiled);
2406           }
2407           stats->_nmethods_size += code->total_size();
2408           stats->_nmethods_code_size += code->insts_size();
2409         } else { // if (!stats)
2410           assert(false, "Compiler statistics object must exist");
2411         }
2412       } else { // if (!comp)
2413         assert(false, "Compiler object must exist");
2414       }
2415 #endif // INCLUDE_JVMCI
2416     }
2417 
2418     if (UsePerfData) {
2419       // save the name of the last method compiled
2420       _perf_last_method->set_value(counters->current_method());
2421       _perf_last_compile_type->set_value(counters->compile_type());
2422       _perf_last_compile_size->set_value(method->code_size() +
2423                                          task->num_inlined_bytecodes());
2424       if (is_osr) {
2425         _perf_osr_compilation->inc(time.ticks());
2426         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2427       } else {
2428         _perf_standard_compilation->inc(time.ticks());
2429         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2430       }
2431     }
2432 
2433     if (CITimeEach) {
2434       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2435       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2436                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2437     }
2438 
2439     // Collect counts of successful compilations
2440     _sum_nmethod_size      += code->total_size();
2441     _sum_nmethod_code_size += code->insts_size();
2442     _total_compile_count++;
2443 
2444     if (UsePerfData) {
2445       _perf_sum_nmethod_size->inc(     code->total_size());
2446       _perf_sum_nmethod_code_size->inc(code->insts_size());
2447       _perf_total_compile_count->inc();
2448     }
2449 
2450     if (is_osr) {
2451       if (UsePerfData) _perf_total_osr_compile_count->inc();
2452       _total_osr_compile_count++;
2453     } else {
2454       if (UsePerfData) _perf_total_standard_compile_count->inc();
2455       _total_standard_compile_count++;
2456     }
2457   }
2458   // set the current method for the thread to null
2459   if (UsePerfData) counters->set_current_method("");
2460 }
2461 
2462 const char* CompileBroker::compiler_name(int comp_level) {
2463   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2464   if (comp == NULL) {
2465     return "no compiler";
2466   } else {
2467     return (comp->name());
2468   }
2469 }
2470 
2471 #if INCLUDE_JVMCI
2472 void CompileBroker::print_times(AbstractCompiler* comp) {
2473   CompilerStatistics* stats = comp->stats();
2474   if (stats) {
2475     tty->print_cr("  %s {speed: %d bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2476                 comp->name(), stats->bytes_per_second(),
2477                 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2478                 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2479                 stats->_nmethods_size, stats->_nmethods_code_size);
2480   } else { // if (!stats)
2481     assert(false, "Compiler statistics object must exist");
2482   }
2483   comp->print_timers();
2484 }
2485 #endif // INCLUDE_JVMCI
2486 
2487 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2488 #if INCLUDE_JVMCI
2489   elapsedTimer standard_compilation;
2490   elapsedTimer total_compilation;
2491   elapsedTimer osr_compilation;
2492 
2493   int standard_bytes_compiled = 0;
2494   int osr_bytes_compiled = 0;
2495 
2496   int standard_compile_count = 0;
2497   int osr_compile_count = 0;
2498   int total_compile_count = 0;
2499 
2500   int nmethods_size = 0;
2501   int nmethods_code_size = 0;
2502   bool printedHeader = false;
2503 
2504   for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2505     AbstractCompiler* comp = _compilers[i];
2506     if (comp != NULL) {
2507       if (per_compiler && aggregate && !printedHeader) {
2508         printedHeader = true;
2509         tty->cr();
2510         tty->print_cr("Individual compiler times (for compiled methods only)");
2511         tty->print_cr("------------------------------------------------");
2512         tty->cr();
2513       }
2514       CompilerStatistics* stats = comp->stats();
2515 
2516       if (stats) {
2517         standard_compilation.add(stats->_standard._time);
2518         osr_compilation.add(stats->_osr._time);
2519 
2520         standard_bytes_compiled += stats->_standard._bytes;
2521         osr_bytes_compiled += stats->_osr._bytes;
2522 
2523         standard_compile_count += stats->_standard._count;
2524         osr_compile_count += stats->_osr._count;
2525 
2526         nmethods_size += stats->_nmethods_size;
2527         nmethods_code_size += stats->_nmethods_code_size;
2528       } else { // if (!stats)
2529         assert(false, "Compiler statistics object must exist");
2530       }
2531 
2532       if (per_compiler) {
2533         print_times(comp);
2534       }
2535     }
2536   }
2537   total_compile_count = osr_compile_count + standard_compile_count;
2538   total_compilation.add(osr_compilation);
2539   total_compilation.add(standard_compilation);
2540 
2541   // In hosted mode, print the JVMCI compiler specific counters manually.
2542   if (!UseJVMCICompiler) {
2543     JVMCICompiler::print_compilation_timers();
2544   }
2545 #else // INCLUDE_JVMCI
2546   elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2547   elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2548   elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2549 
2550   int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2551   int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2552 
2553   int standard_compile_count = CompileBroker::_total_standard_compile_count;
2554   int osr_compile_count = CompileBroker::_total_osr_compile_count;
2555   int total_compile_count = CompileBroker::_total_compile_count;
2556 
2557   int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2558   int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2559 #endif // INCLUDE_JVMCI
2560 
2561   if (!aggregate) {
2562     return;
2563   }
2564   tty->cr();
2565   tty->print_cr("Accumulated compiler times");
2566   tty->print_cr("----------------------------------------------------------");
2567                //0000000000111111111122222222223333333333444444444455555555556666666666
2568                //0123456789012345678901234567890123456789012345678901234567890123456789
2569   tty->print_cr("  Total compilation time   : %7.3f s", total_compilation.seconds());
2570   tty->print_cr("    Standard compilation   : %7.3f s, Average : %2.3f s",
2571                 standard_compilation.seconds(),
2572                 standard_compilation.seconds() / standard_compile_count);
2573   tty->print_cr("    Bailed out compilation : %7.3f s, Average : %2.3f s",
2574                 CompileBroker::_t_bailedout_compilation.seconds(),
2575                 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2576   tty->print_cr("    On stack replacement   : %7.3f s, Average : %2.3f s",
2577                 osr_compilation.seconds(),
2578                 osr_compilation.seconds() / osr_compile_count);
2579   tty->print_cr("    Invalidated            : %7.3f s, Average : %2.3f s",
2580                 CompileBroker::_t_invalidated_compilation.seconds(),
2581                 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2582 
2583   AbstractCompiler *comp = compiler(CompLevel_simple);
2584   if (comp != NULL) {
2585     tty->cr();
2586     comp->print_timers();
2587   }
2588   comp = compiler(CompLevel_full_optimization);
2589   if (comp != NULL) {
2590     tty->cr();
2591     comp->print_timers();
2592   }
2593   tty->cr();
2594   tty->print_cr("  Total compiled methods    : %8d methods", total_compile_count);
2595   tty->print_cr("    Standard compilation    : %8d methods", standard_compile_count);
2596   tty->print_cr("    On stack replacement    : %8d methods", osr_compile_count);
2597   int tcb = osr_bytes_compiled + standard_bytes_compiled;
2598   tty->print_cr("  Total compiled bytecodes  : %8d bytes", tcb);
2599   tty->print_cr("    Standard compilation    : %8d bytes", standard_bytes_compiled);
2600   tty->print_cr("    On stack replacement    : %8d bytes", osr_bytes_compiled);
2601   double tcs = total_compilation.seconds();
2602   int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2603   tty->print_cr("  Average compilation speed : %8d bytes/s", bps);
2604   tty->cr();
2605   tty->print_cr("  nmethod code size         : %8d bytes", nmethods_code_size);
2606   tty->print_cr("  nmethod total size        : %8d bytes", nmethods_size);
2607 }
2608 
2609 // Print general/accumulated JIT information.
2610 void CompileBroker::print_info(outputStream *out) {
2611   if (out == NULL) out = tty;
2612   out->cr();
2613   out->print_cr("======================");
2614   out->print_cr("   General JIT info   ");
2615   out->print_cr("======================");
2616   out->cr();
2617   out->print_cr("            JIT is : %7s",     should_compile_new_jobs() ? "on" : "off");
2618   out->print_cr("  Compiler threads : %7d",     (int)CICompilerCount);
2619   out->cr();
2620   out->print_cr("CodeCache overview");
2621   out->print_cr("--------------------------------------------------------");
2622   out->cr();
2623   out->print_cr("         Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2624   out->print_cr("        Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2625   out->print_cr("  Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2626   out->cr();
2627 
2628   out->cr();
2629   out->print_cr("CodeCache cleaning overview");
2630   out->print_cr("--------------------------------------------------------");
2631   out->cr();
2632   NMethodSweeper::print(out);
2633   out->print_cr("--------------------------------------------------------");
2634   out->cr();
2635 }
2636 
2637 // Note: tty_lock must not be held upon entry to this function.
2638 //       Print functions called from herein do "micro-locking" on tty_lock.
2639 //       That's a tradeoff which keeps together important blocks of output.
2640 //       At the same time, continuous tty_lock hold time is kept in check,
2641 //       preventing concurrently printing threads from stalling a long time.
2642 void CompileBroker::print_heapinfo(outputStream* out, const char* function, const char* granularity) {
2643   TimeStamp ts_total;
2644   TimeStamp ts_global;
2645   TimeStamp ts;
2646 
2647   bool allFun = !strcmp(function, "all");
2648   bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2649   bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2650   bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2651   bool methodCount = !strcmp(function, "MethodCount") || allFun;
2652   bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2653   bool methodAge = !strcmp(function, "MethodAge") || allFun;
2654   bool methodNames = !strcmp(function, "MethodNames") || allFun;
2655   bool discard = !strcmp(function, "discard") || allFun;
2656 
2657   if (out == NULL) {
2658     out = tty;
2659   }
2660 
2661   if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2662     out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2663     out->cr();
2664     return;
2665   }
2666 
2667   ts_total.update(); // record starting point
2668 
2669   if (aggregate) {
2670     print_info(out);
2671   }
2672 
2673   // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2674   // That prevents another thread from destroying our view on the CodeHeap.
2675   // When we request individual parts of the analysis via the jcmd interface, it is possible
2676   // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2677   // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock
2678   // across user interaction.
2679   // Acquire this lock before acquiring the CodeCache_lock.
2680   // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time,
2681   // leading to an unnecessarily long hold time of the CodeCache_lock.
2682   ts.update(); // record starting point
2683   MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag);
2684   out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2685 
2686   // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock
2687   // for the entire duration of aggregation and printing. That makes sure
2688   // we see a consistent picture and do not run into issues caused by
2689   // the CodeHeap being altered concurrently.
2690   Monitor* global_lock   = allFun ? CodeCache_lock : NULL;
2691   Monitor* function_lock = allFun ? NULL : CodeCache_lock;
2692   ts_global.update(); // record starting point
2693   MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag);
2694   if (global_lock != NULL) {
2695     out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2696     ts_global.update(); // record starting point
2697   }
2698 
2699   if (aggregate) {
2700     ts.update(); // record starting point
2701     MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2702     if (function_lock != NULL) {
2703       out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2704     }
2705 
2706     ts.update(); // record starting point
2707     CodeCache::aggregate(out, granularity);
2708     if (function_lock != NULL) {
2709       out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2710     }
2711   }
2712 
2713   if (usedSpace) CodeCache::print_usedSpace(out);
2714   if (freeSpace) CodeCache::print_freeSpace(out);
2715   if (methodCount) CodeCache::print_count(out);
2716   if (methodSpace) CodeCache::print_space(out);
2717   if (methodAge) CodeCache::print_age(out);
2718   if (methodNames) {
2719     // print_names() has shown to be sensitive to concurrent CodeHeap modifications.
2720     // Therefore, request  the CodeCache_lock before calling...
2721     MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2722     CodeCache::print_names(out);
2723   }
2724   if (discard) CodeCache::discard(out);
2725 
2726   if (global_lock != NULL) {
2727     out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2728   }
2729   out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2730 }