1 /*
   2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "compiler/compileBroker.hpp"
  30 #include "compiler/compileLog.hpp"
  31 #include "compiler/compilerOracle.hpp"
  32 #include "interpreter/linkResolver.hpp"
  33 #include "memory/allocation.inline.hpp"
  34 #include "oops/methodDataOop.hpp"
  35 #include "oops/methodOop.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "prims/nativeLookup.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/compilationPolicy.hpp"
  40 #include "runtime/init.hpp"
  41 #include "runtime/interfaceSupport.hpp"
  42 #include "runtime/javaCalls.hpp"
  43 #include "runtime/os.hpp"
  44 #include "runtime/sharedRuntime.hpp"
  45 #include "runtime/sweeper.hpp"
  46 #include "utilities/dtrace.hpp"
  47 #ifdef COMPILER1
  48 #include "c1/c1_Compiler.hpp"
  49 #endif
  50 #ifdef COMPILER2
  51 #include "opto/c2compiler.hpp"
  52 #endif
  53 #ifdef SHARK
  54 #include "shark/sharkCompiler.hpp"
  55 #endif
  56 
  57 #ifdef DTRACE_ENABLED
  58 
  59 // Only bother with this argument setup if dtrace is available
  60 
  61 #ifndef USDT2
  62 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
  63   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
  64 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
  65   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
  66 
  67 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)              \
  68   {                                                                      \
  69     char* comp_name = (char*)(compiler)->name();                         \
  70     Symbol* klass_name = (method)->klass_name();                         \
  71     Symbol* name = (method)->name();                                     \
  72     Symbol* signature = (method)->signature();                           \
  73     HS_DTRACE_PROBE8(hotspot, method__compile__begin,                    \
  74       comp_name, strlen(comp_name),                                      \
  75       klass_name->bytes(), klass_name->utf8_length(),                    \
  76       name->bytes(), name->utf8_length(),                                \
  77       signature->bytes(), signature->utf8_length());                     \
  78   }
  79 
  80 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)       \
  81   {                                                                      \
  82     char* comp_name = (char*)(compiler)->name();                         \
  83     Symbol* klass_name = (method)->klass_name();                         \
  84     Symbol* name = (method)->name();                                     \
  85     Symbol* signature = (method)->signature();                           \
  86     HS_DTRACE_PROBE9(hotspot, method__compile__end,                      \
  87       comp_name, strlen(comp_name),                                      \
  88       klass_name->bytes(), klass_name->utf8_length(),                    \
  89       name->bytes(), name->utf8_length(),                                \
  90       signature->bytes(), signature->utf8_length(), (success));          \
  91   }
  92 
  93 #else /* USDT2 */
  94 
  95 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)              \
  96   {                                                                      \
  97     char* comp_name = (char*)(compiler)->name();                         \
  98     Symbol* klass_name = (method)->klass_name();                         \
  99     Symbol* name = (method)->name();                                     \
 100     Symbol* signature = (method)->signature();                           \
 101     HOTSPOT_METHOD_COMPILE_BEGIN(                                       \
 102       comp_name, strlen(comp_name),                                      \
 103       (char *) klass_name->bytes(), klass_name->utf8_length(),          \
 104       (char *) name->bytes(), name->utf8_length(),                       \
 105       (char *) signature->bytes(), signature->utf8_length());            \
 106   }
 107 
 108 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)       \
 109   {                                                                      \
 110     char* comp_name = (char*)(compiler)->name();                         \
 111     Symbol* klass_name = (method)->klass_name();                         \
 112     Symbol* name = (method)->name();                                     \
 113     Symbol* signature = (method)->signature();                           \
 114     HOTSPOT_METHOD_COMPILE_END(                                          \
 115       comp_name, strlen(comp_name),                                      \
 116       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
 117       (char *) name->bytes(), name->utf8_length(),                       \
 118       (char *) signature->bytes(), signature->utf8_length(), (success)); \
 119   }
 120 #endif /* USDT2 */
 121 
 122 #else //  ndef DTRACE_ENABLED
 123 
 124 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)
 125 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)
 126 
 127 #endif // ndef DTRACE_ENABLED
 128 
 129 bool CompileBroker::_initialized = false;
 130 volatile bool CompileBroker::_should_block = false;
 131 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 132 
 133 // The installed compiler(s)
 134 AbstractCompiler* CompileBroker::_compilers[2];
 135 
 136 // These counters are used for assigning id's to each compilation
 137 uint CompileBroker::_compilation_id        = 0;
 138 uint CompileBroker::_osr_compilation_id    = 0;
 139 
 140 // Debugging information
 141 int  CompileBroker::_last_compile_type     = no_compile;
 142 int  CompileBroker::_last_compile_level    = CompLevel_none;
 143 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 144 
 145 // Performance counters
 146 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 147 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 148 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 149 
 150 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 151 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 152 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 153 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 154 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 155 
 156 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 157 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 158 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 159 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 160 
 161 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 162 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 163 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 164 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 165 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 166 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 167 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 168 
 169 // Timers and counters for generating statistics
 170 elapsedTimer CompileBroker::_t_total_compilation;
 171 elapsedTimer CompileBroker::_t_osr_compilation;
 172 elapsedTimer CompileBroker::_t_standard_compilation;
 173 
 174 int CompileBroker::_total_bailout_count          = 0;
 175 int CompileBroker::_total_invalidated_count      = 0;
 176 int CompileBroker::_total_compile_count          = 0;
 177 int CompileBroker::_total_osr_compile_count      = 0;
 178 int CompileBroker::_total_standard_compile_count = 0;
 179 
 180 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 181 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 182 int CompileBroker::_sum_nmethod_size             = 0;
 183 int CompileBroker::_sum_nmethod_code_size        = 0;
 184 
 185 CompileQueue* CompileBroker::_c2_method_queue   = NULL;
 186 CompileQueue* CompileBroker::_c1_method_queue   = NULL;
 187 CompileTask*  CompileBroker::_task_free_list = NULL;
 188 
 189 GrowableArray<CompilerThread*>* CompileBroker::_method_threads = NULL;
 190 
 191 
 192 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 193   CompilerThread* thread = CompilerThread::current();
 194   thread->set_task(task);
 195   CompileLog*     log  = thread->log();
 196   if (log != NULL)  task->log_task_start(log);
 197 }
 198 
 199 CompileTaskWrapper::~CompileTaskWrapper() {
 200   CompilerThread* thread = CompilerThread::current();
 201   CompileTask* task = thread->task();
 202   CompileLog*  log  = thread->log();
 203   if (log != NULL)  task->log_task_done(log);
 204   thread->set_task(NULL);
 205   task->set_code_handle(NULL);
 206   DEBUG_ONLY(thread->set_env((ciEnv*)badAddress));
 207   if (task->is_blocking()) {
 208     MutexLocker notifier(task->lock(), thread);
 209     task->mark_complete();
 210     // Notify the waiting thread that the compilation has completed.
 211     task->lock()->notify_all();
 212   } else {
 213     task->mark_complete();
 214 
 215     // By convention, the compiling thread is responsible for
 216     // recycling a non-blocking CompileTask.
 217     CompileBroker::free_task(task);
 218   }
 219 }
 220 
 221 
 222 // ------------------------------------------------------------------
 223 // CompileTask::initialize
 224 void CompileTask::initialize(int compile_id,
 225                              methodHandle method,
 226                              int osr_bci,
 227                              int comp_level,
 228                              methodHandle hot_method,
 229                              int hot_count,
 230                              const char* comment,
 231                              bool is_blocking) {
 232   assert(!_lock->is_locked(), "bad locking");
 233 
 234   _compile_id = compile_id;
 235   _method = JNIHandles::make_global(method);
 236   _osr_bci = osr_bci;
 237   _is_blocking = is_blocking;
 238   _comp_level = comp_level;
 239   _num_inlined_bytecodes = 0;
 240 
 241   _is_complete = false;
 242   _is_success = false;
 243   _code_handle = NULL;
 244 
 245   _hot_method = NULL;
 246   _hot_count = hot_count;
 247   _time_queued = 0;  // tidy
 248   _comment = comment;
 249 
 250   if (LogCompilation) {
 251     _time_queued = os::elapsed_counter();
 252     if (hot_method.not_null()) {
 253       if (hot_method == method) {
 254         _hot_method = _method;
 255       } else {
 256         _hot_method = JNIHandles::make_global(hot_method);
 257       }
 258     }
 259   }
 260 
 261   _next = NULL;
 262 }
 263 
 264 // ------------------------------------------------------------------
 265 // CompileTask::code/set_code
 266 nmethod* CompileTask::code() const {
 267   if (_code_handle == NULL)  return NULL;
 268   return _code_handle->code();
 269 }
 270 void CompileTask::set_code(nmethod* nm) {
 271   if (_code_handle == NULL && nm == NULL)  return;
 272   guarantee(_code_handle != NULL, "");
 273   _code_handle->set_code(nm);
 274   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 275 }
 276 
 277 // ------------------------------------------------------------------
 278 // CompileTask::free
 279 void CompileTask::free() {
 280   set_code(NULL);
 281   assert(!_lock->is_locked(), "Should not be locked when freed");
 282   if (_hot_method != NULL && _hot_method != _method) {
 283     JNIHandles::destroy_global(_hot_method);
 284   }
 285   JNIHandles::destroy_global(_method);
 286 }
 287 
 288 
 289 // ------------------------------------------------------------------
 290 // CompileTask::print
 291 void CompileTask::print() {
 292   tty->print("<CompileTask compile_id=%d ", _compile_id);
 293   tty->print("method=");
 294   ((methodOop)JNIHandles::resolve(_method))->print_name(tty);
 295   tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
 296              _osr_bci, bool_to_str(_is_blocking),
 297              bool_to_str(_is_complete), bool_to_str(_is_success));
 298 }
 299 
 300 
 301 // ------------------------------------------------------------------
 302 // CompileTask::print_line_on_error
 303 //
 304 // This function is called by fatal error handler when the thread
 305 // causing troubles is a compiler thread.
 306 //
 307 // Do not grab any lock, do not allocate memory.
 308 //
 309 // Otherwise it's the same as CompileTask::print_line()
 310 //
 311 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
 312   // print compiler name
 313   st->print("%s:", CompileBroker::compiler(comp_level())->name());
 314   print_compilation(st);
 315 }
 316 
 317 // ------------------------------------------------------------------
 318 // CompileTask::print_line
 319 void CompileTask::print_line() {
 320   ttyLocker ttyl;  // keep the following output all in one block
 321   // print compiler name if requested
 322   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler(comp_level())->name());
 323   print_compilation();
 324 }
 325 
 326 
 327 // ------------------------------------------------------------------
 328 // CompileTask::print_compilation_impl
 329 void CompileTask::print_compilation_impl(outputStream* st, methodOop method, int compile_id, int comp_level, bool is_osr_method, int osr_bci, bool is_blocking, const char* msg) {
 330   st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp
 331   st->print("%4d ", compile_id);    // print compilation number
 332 
 333   // For unloaded methods the transition to zombie occurs after the
 334   // method is cleared so it's impossible to report accurate
 335   // information for that case.
 336   bool is_synchronized = false;
 337   bool has_exception_handler = false;
 338   bool is_native = false;
 339   if (method != NULL) {
 340     is_synchronized       = method->is_synchronized();
 341     has_exception_handler = method->has_exception_handler();
 342     is_native             = method->is_native();
 343   }
 344   // method attributes
 345   const char compile_type   = is_osr_method                   ? '%' : ' ';
 346   const char sync_char      = is_synchronized                 ? 's' : ' ';
 347   const char exception_char = has_exception_handler           ? '!' : ' ';
 348   const char blocking_char  = is_blocking                     ? 'b' : ' ';
 349   const char native_char    = is_native                       ? 'n' : ' ';
 350 
 351   // print method attributes
 352   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
 353 
 354   if (TieredCompilation) {
 355     if (comp_level != -1)  st->print("%d ", comp_level);
 356     else                   st->print("- ");
 357   }
 358   st->print("     ");  // more indent
 359 
 360   if (method == NULL) {
 361     st->print("(method)");
 362   } else {
 363     method->print_short_name(st);
 364     if (is_osr_method) {
 365       st->print(" @ %d", osr_bci);
 366     }
 367     st->print(" (%d bytes)", method->code_size());
 368   }
 369 
 370   if (msg != NULL) {
 371     st->print("   %s", msg);
 372   }
 373   st->cr();
 374 }
 375 
 376 // ------------------------------------------------------------------
 377 // CompileTask::print_inlining
 378 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
 379   //         1234567
 380   st->print("        ");     // print timestamp
 381   //         1234
 382   st->print("     ");        // print compilation number
 383 
 384   // method attributes
 385   const char sync_char      = method->is_synchronized()        ? 's' : ' ';
 386   const char exception_char = method->has_exception_handlers() ? '!' : ' ';
 387   const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';
 388 
 389   // print method attributes
 390   st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);
 391 
 392   if (TieredCompilation) {
 393     st->print("  ");
 394   }
 395   st->print("     ");        // more indent
 396   st->print("    ");         // initial inlining indent
 397 
 398   for (int i = 0; i < inline_level; i++)  st->print("  ");
 399 
 400   st->print("@ %d  ", bci);  // print bci
 401   method->print_short_name(st);
 402   st->print(" (%d bytes)", method->code_size());
 403 
 404   if (msg != NULL) {
 405     st->print("   %s", msg);
 406   }
 407   st->cr();
 408 }
 409 
 410 // ------------------------------------------------------------------
 411 // CompileTask::print_inline_indent
 412 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
 413   //         1234567
 414   st->print("        ");     // print timestamp
 415   //         1234
 416   st->print("     ");        // print compilation number
 417   //         %s!bn
 418   st->print("      ");       // print method attributes
 419   if (TieredCompilation) {
 420     st->print("  ");
 421   }
 422   st->print("     ");        // more indent
 423   st->print("    ");         // initial inlining indent
 424   for (int i = 0; i < inline_level; i++)  st->print("  ");
 425 }
 426 
 427 // ------------------------------------------------------------------
 428 // CompileTask::print_compilation
 429 void CompileTask::print_compilation(outputStream* st) {
 430   oop rem = JNIHandles::resolve(method_handle());
 431   assert(rem != NULL && rem->is_method(), "must be");
 432   methodOop method = (methodOop) rem;
 433   bool is_osr_method = osr_bci() != InvocationEntryBci;
 434   print_compilation_impl(st, method, compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking());
 435 }
 436 
 437 // ------------------------------------------------------------------
 438 // CompileTask::log_task
 439 void CompileTask::log_task(xmlStream* log) {
 440   Thread* thread = Thread::current();
 441   methodHandle method(thread,
 442                       (methodOop)JNIHandles::resolve(method_handle()));
 443   ResourceMark rm(thread);
 444 
 445   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
 446   if (_compile_id != 0)   log->print(" compile_id='%d'", _compile_id);
 447   if (_osr_bci != CompileBroker::standard_entry_bci) {
 448     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind
 449   } // else compile_kind='c2c'
 450   if (!method.is_null())  log->method(method);
 451   if (_osr_bci != CompileBroker::standard_entry_bci) {
 452     log->print(" osr_bci='%d'", _osr_bci);
 453   }
 454   if (_comp_level != CompLevel_highest_tier) {
 455     log->print(" level='%d'", _comp_level);
 456   }
 457   if (_is_blocking) {
 458     log->print(" blocking='1'");
 459   }
 460   log->stamp();
 461 }
 462 
 463 
 464 // ------------------------------------------------------------------
 465 // CompileTask::log_task_queued
 466 void CompileTask::log_task_queued() {
 467   Thread* thread = Thread::current();
 468   ttyLocker ttyl;
 469   ResourceMark rm(thread);
 470 
 471   xtty->begin_elem("task_queued");
 472   log_task(xtty);
 473   if (_comment != NULL) {
 474     xtty->print(" comment='%s'", _comment);
 475   }
 476   if (_hot_method != NULL) {
 477     methodHandle hot(thread,
 478                      (methodOop)JNIHandles::resolve(_hot_method));
 479     methodHandle method(thread,
 480                         (methodOop)JNIHandles::resolve(_method));
 481     if (hot() != method()) {
 482       xtty->method(hot);
 483     }
 484   }
 485   if (_hot_count != 0) {
 486     xtty->print(" hot_count='%d'", _hot_count);
 487   }
 488   xtty->end_elem();
 489 }
 490 
 491 
 492 // ------------------------------------------------------------------
 493 // CompileTask::log_task_start
 494 void CompileTask::log_task_start(CompileLog* log)   {
 495   log->begin_head("task");
 496   log_task(log);
 497   log->end_head();
 498 }
 499 
 500 
 501 // ------------------------------------------------------------------
 502 // CompileTask::log_task_done
 503 void CompileTask::log_task_done(CompileLog* log) {
 504   Thread* thread = Thread::current();
 505   methodHandle method(thread,
 506                       (methodOop)JNIHandles::resolve(method_handle()));
 507   ResourceMark rm(thread);
 508 
 509   // <task_done ... stamp='1.234'>  </task>
 510   nmethod* nm = code();
 511   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
 512                   _is_success, nm == NULL ? 0 : nm->content_size(),
 513                   method->invocation_count());
 514   int bec = method->backedge_count();
 515   if (bec != 0)  log->print(" backedge_count='%d'", bec);
 516   // Note:  "_is_complete" is about to be set, but is not.
 517   if (_num_inlined_bytecodes != 0) {
 518     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
 519   }
 520   log->stamp();
 521   log->end_elem();
 522   log->tail("task");
 523   log->clear_identities();   // next task will have different CI
 524   if (log->unflushed_count() > 2000) {
 525     log->flush();
 526   }
 527   log->mark_file_end();
 528 }
 529 
 530 
 531 
 532 // ------------------------------------------------------------------
 533 // CompileQueue::add
 534 //
 535 // Add a CompileTask to a CompileQueue
 536 void CompileQueue::add(CompileTask* task) {
 537   assert(lock()->owned_by_self(), "must own lock");
 538 
 539   task->set_next(NULL);
 540   task->set_prev(NULL);
 541 
 542   if (_last == NULL) {
 543     // The compile queue is empty.
 544     assert(_first == NULL, "queue is empty");
 545     _first = task;
 546     _last = task;
 547   } else {
 548     // Append the task to the queue.
 549     assert(_last->next() == NULL, "not last");
 550     _last->set_next(task);
 551     task->set_prev(_last);
 552     _last = task;
 553   }
 554   ++_size;
 555 
 556   // Mark the method as being in the compile queue.
 557   ((methodOop)JNIHandles::resolve(task->method_handle()))->set_queued_for_compilation();
 558 
 559   if (CIPrintCompileQueue) {
 560     print();
 561   }
 562 
 563   if (LogCompilation && xtty != NULL) {
 564     task->log_task_queued();
 565   }
 566 
 567   // Notify CompilerThreads that a task is available.
 568   lock()->notify_all();
 569 }
 570 
 571 // ------------------------------------------------------------------
 572 // CompileQueue::get
 573 //
 574 // Get the next CompileTask from a CompileQueue
 575 CompileTask* CompileQueue::get() {
 576   NMethodSweeper::possibly_sweep();
 577 
 578   MutexLocker locker(lock());
 579   // Wait for an available CompileTask.
 580   while (_first == NULL) {
 581     // There is no work to be done right now.  Wait.
 582     if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() || CodeCache::needs_flushing())) {
 583       // During the emergency sweeping periods, wake up and sweep occasionally
 584       bool timedout = lock()->wait(!Mutex::_no_safepoint_check_flag, NmethodSweepCheckInterval*1000);
 585       if (timedout) {
 586         MutexUnlocker ul(lock());
 587         // When otherwise not busy, run nmethod sweeping
 588         NMethodSweeper::possibly_sweep();
 589       }
 590     } else {
 591       // During normal operation no need to wake up on timer
 592       lock()->wait();
 593     }
 594   }
 595   CompileTask* task = CompilationPolicy::policy()->select_task(this);
 596   remove(task);
 597   return task;
 598 }
 599 
 600 void CompileQueue::remove(CompileTask* task)
 601 {
 602    assert(lock()->owned_by_self(), "must own lock");
 603   if (task->prev() != NULL) {
 604     task->prev()->set_next(task->next());
 605   } else {
 606     // max is the first element
 607     assert(task == _first, "Sanity");
 608     _first = task->next();
 609   }
 610 
 611   if (task->next() != NULL) {
 612     task->next()->set_prev(task->prev());
 613   } else {
 614     // max is the last element
 615     assert(task == _last, "Sanity");
 616     _last = task->prev();
 617   }
 618   --_size;
 619 }
 620 
 621 // ------------------------------------------------------------------
 622 // CompileQueue::print
 623 void CompileQueue::print() {
 624   tty->print_cr("Contents of %s", name());
 625   tty->print_cr("----------------------");
 626   CompileTask* task = _first;
 627   while (task != NULL) {
 628     task->print_line();
 629     task = task->next();
 630   }
 631   tty->print_cr("----------------------");
 632 }
 633 
 634 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 635 
 636   _current_method[0] = '\0';
 637   _compile_type = CompileBroker::no_compile;
 638 
 639   if (UsePerfData) {
 640     ResourceMark rm;
 641 
 642     // create the thread instance name space string - don't create an
 643     // instance subspace if instance is -1 - keeps the adapterThread
 644     // counters  from having a ".0" namespace.
 645     const char* thread_i = (instance == -1) ? thread_name :
 646                       PerfDataManager::name_space(thread_name, instance);
 647 
 648 
 649     char* name = PerfDataManager::counter_name(thread_i, "method");
 650     _perf_current_method =
 651                PerfDataManager::create_string_variable(SUN_CI, name,
 652                                                        cmname_buffer_length,
 653                                                        _current_method, CHECK);
 654 
 655     name = PerfDataManager::counter_name(thread_i, "type");
 656     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 657                                                           PerfData::U_None,
 658                                                          (jlong)_compile_type,
 659                                                           CHECK);
 660 
 661     name = PerfDataManager::counter_name(thread_i, "time");
 662     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 663                                                  PerfData::U_Ticks, CHECK);
 664 
 665     name = PerfDataManager::counter_name(thread_i, "compiles");
 666     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 667                                                      PerfData::U_Events, CHECK);
 668   }
 669 }
 670 
 671 // ------------------------------------------------------------------
 672 // CompileBroker::compilation_init
 673 //
 674 // Initialize the Compilation object
 675 void CompileBroker::compilation_init() {
 676   _last_method_compiled[0] = '\0';
 677 
 678 #ifndef SHARK
 679   // Set the interface to the current compiler(s).
 680   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 681   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 682 #ifdef COMPILER1
 683   if (c1_count > 0) {
 684     _compilers[0] = new Compiler();
 685   }
 686 #endif // COMPILER1
 687 
 688 #ifdef COMPILER2
 689   if (c2_count > 0) {
 690     _compilers[1] = new C2Compiler();
 691   }
 692 #endif // COMPILER2
 693 
 694 #else // SHARK
 695   int c1_count = 0;
 696   int c2_count = 1;
 697 
 698   _compilers[1] = new SharkCompiler();
 699 #endif // SHARK
 700 
 701   // Initialize the CompileTask free list
 702   _task_free_list = NULL;
 703 
 704   // Start the CompilerThreads
 705   init_compiler_threads(c1_count, c2_count);
 706   // totalTime performance counter is always created as it is required
 707   // by the implementation of java.lang.management.CompilationMBean.
 708   {
 709     EXCEPTION_MARK;
 710     _perf_total_compilation =
 711                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 712                                                  PerfData::U_Ticks, CHECK);
 713   }
 714 
 715 
 716   if (UsePerfData) {
 717 
 718     EXCEPTION_MARK;
 719 
 720     // create the jvmstat performance counters
 721     _perf_osr_compilation =
 722                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 723                                                  PerfData::U_Ticks, CHECK);
 724 
 725     _perf_standard_compilation =
 726                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 727                                                  PerfData::U_Ticks, CHECK);
 728 
 729     _perf_total_bailout_count =
 730                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 731                                                  PerfData::U_Events, CHECK);
 732 
 733     _perf_total_invalidated_count =
 734                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 735                                                  PerfData::U_Events, CHECK);
 736 
 737     _perf_total_compile_count =
 738                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 739                                                  PerfData::U_Events, CHECK);
 740     _perf_total_osr_compile_count =
 741                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 742                                                  PerfData::U_Events, CHECK);
 743 
 744     _perf_total_standard_compile_count =
 745                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 746                                                  PerfData::U_Events, CHECK);
 747 
 748     _perf_sum_osr_bytes_compiled =
 749                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 750                                                  PerfData::U_Bytes, CHECK);
 751 
 752     _perf_sum_standard_bytes_compiled =
 753                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 754                                                  PerfData::U_Bytes, CHECK);
 755 
 756     _perf_sum_nmethod_size =
 757                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 758                                                  PerfData::U_Bytes, CHECK);
 759 
 760     _perf_sum_nmethod_code_size =
 761                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 762                                                  PerfData::U_Bytes, CHECK);
 763 
 764     _perf_last_method =
 765                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 766                                        CompilerCounters::cmname_buffer_length,
 767                                        "", CHECK);
 768 
 769     _perf_last_failed_method =
 770             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 771                                        CompilerCounters::cmname_buffer_length,
 772                                        "", CHECK);
 773 
 774     _perf_last_invalidated_method =
 775         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 776                                      CompilerCounters::cmname_buffer_length,
 777                                      "", CHECK);
 778 
 779     _perf_last_compile_type =
 780              PerfDataManager::create_variable(SUN_CI, "lastType",
 781                                               PerfData::U_None,
 782                                               (jlong)CompileBroker::no_compile,
 783                                               CHECK);
 784 
 785     _perf_last_compile_size =
 786              PerfDataManager::create_variable(SUN_CI, "lastSize",
 787                                               PerfData::U_Bytes,
 788                                               (jlong)CompileBroker::no_compile,
 789                                               CHECK);
 790 
 791 
 792     _perf_last_failed_type =
 793              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 794                                               PerfData::U_None,
 795                                               (jlong)CompileBroker::no_compile,
 796                                               CHECK);
 797 
 798     _perf_last_invalidated_type =
 799          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 800                                           PerfData::U_None,
 801                                           (jlong)CompileBroker::no_compile,
 802                                           CHECK);
 803   }
 804 
 805   _initialized = true;
 806 }
 807 
 808 
 809 
 810 // ------------------------------------------------------------------
 811 // CompileBroker::make_compiler_thread
 812 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, TRAPS) {
 813   CompilerThread* compiler_thread = NULL;
 814 
 815   klassOop k =
 816     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
 817                                       true, CHECK_0);
 818   instanceKlassHandle klass (THREAD, k);
 819   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 820   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 821 
 822   // Initialize thread_oop to put it into the system threadGroup
 823   Handle thread_group (THREAD,  Universe::system_thread_group());
 824   JavaValue result(T_VOID);
 825   JavaCalls::call_special(&result, thread_oop,
 826                        klass,
 827                        vmSymbols::object_initializer_name(),
 828                        vmSymbols::threadgroup_string_void_signature(),
 829                        thread_group,
 830                        string,
 831                        CHECK_0);
 832 
 833   {
 834     MutexLocker mu(Threads_lock, THREAD);
 835     compiler_thread = new CompilerThread(queue, counters);
 836     // At this point the new CompilerThread data-races with this startup
 837     // thread (which I believe is the primoridal thread and NOT the VM
 838     // thread).  This means Java bytecodes being executed at startup can
 839     // queue compile jobs which will run at whatever default priority the
 840     // newly created CompilerThread runs at.
 841 
 842 
 843     // At this point it may be possible that no osthread was created for the
 844     // JavaThread due to lack of memory. We would have to throw an exception
 845     // in that case. However, since this must work and we do not allow
 846     // exceptions anyway, check and abort if this fails.
 847 
 848     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
 849       vm_exit_during_initialization("java.lang.OutOfMemoryError",
 850                                     "unable to create new native thread");
 851     }
 852 
 853     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
 854 
 855     // Note that this only sets the JavaThread _priority field, which by
 856     // definition is limited to Java priorities and not OS priorities.
 857     // The os-priority is set in the CompilerThread startup code itself
 858     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
 859     // CLEANUP PRIORITIES: This -if- statement hids a bug whereby the compiler
 860     // threads never have their OS priority set.  The assumption here is to
 861     // enable the Performance group to do flag tuning, figure out a suitable
 862     // CompilerThreadPriority, and then remove this 'if' statement (and
 863     // comment) and unconditionally set the priority.
 864 
 865     // Compiler Threads should be at the highest Priority
 866     if ( CompilerThreadPriority != -1 )
 867       os::set_native_priority( compiler_thread, CompilerThreadPriority );
 868     else
 869       os::set_native_priority( compiler_thread, os::java_to_os_priority[NearMaxPriority]);
 870 
 871       // Note that I cannot call os::set_priority because it expects Java
 872       // priorities and I am *explicitly* using OS priorities so that it's
 873       // possible to set the compiler thread priority higher than any Java
 874       // thread.
 875 
 876     java_lang_Thread::set_daemon(thread_oop());
 877 
 878     compiler_thread->set_threadObj(thread_oop());
 879     Threads::add(compiler_thread);
 880     Thread::start(compiler_thread);
 881   }
 882   // Let go of Threads_lock before yielding
 883   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 884 
 885   return compiler_thread;
 886 }
 887 
 888 
 889 // ------------------------------------------------------------------
 890 // CompileBroker::init_compiler_threads
 891 //
 892 // Initialize the compilation queue
 893 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
 894   EXCEPTION_MARK;
 895 #if !defined(ZERO) && !defined(SHARK)
 896   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
 897 #endif // !ZERO && !SHARK
 898   if (c2_compiler_count > 0) {
 899     _c2_method_queue  = new CompileQueue("C2MethodQueue",  MethodCompileQueue_lock);
 900   }
 901   if (c1_compiler_count > 0) {
 902     _c1_method_queue  = new CompileQueue("C1MethodQueue",  MethodCompileQueue_lock);
 903   }
 904 
 905   int compiler_count = c1_compiler_count + c2_compiler_count;
 906 
 907   _method_threads =
 908     new (ResourceObj::C_HEAP) GrowableArray<CompilerThread*>(compiler_count, true);
 909 
 910   char name_buffer[256];
 911   for (int i = 0; i < c2_compiler_count; i++) {
 912     // Create a name for our thread.
 913     sprintf(name_buffer, "C2 CompilerThread%d", i);
 914     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 915     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
 916     _method_threads->append(new_thread);
 917   }
 918 
 919   for (int i = c2_compiler_count; i < compiler_count; i++) {
 920     // Create a name for our thread.
 921     sprintf(name_buffer, "C1 CompilerThread%d", i);
 922     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 923     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
 924     _method_threads->append(new_thread);
 925   }
 926 
 927   if (UsePerfData) {
 928     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
 929                                      compiler_count, CHECK);
 930   }
 931 }
 932 
 933 // ------------------------------------------------------------------
 934 // CompileBroker::is_idle
 935 bool CompileBroker::is_idle() {
 936   if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
 937     return false;
 938   } else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
 939     return false;
 940   } else {
 941     int num_threads = _method_threads->length();
 942     for (int i=0; i<num_threads; i++) {
 943       if (_method_threads->at(i)->task() != NULL) {
 944         return false;
 945       }
 946     }
 947 
 948     // No pending or active compilations.
 949     return true;
 950   }
 951 }
 952 
 953 
 954 // ------------------------------------------------------------------
 955 // CompileBroker::compile_method
 956 //
 957 // Request compilation of a method.
 958 void CompileBroker::compile_method_base(methodHandle method,
 959                                         int osr_bci,
 960                                         int comp_level,
 961                                         methodHandle hot_method,
 962                                         int hot_count,
 963                                         const char* comment,
 964                                         TRAPS) {
 965   // do nothing if compiler thread(s) is not available
 966   if (!_initialized ) {
 967     return;
 968   }
 969 
 970   guarantee(!method->is_abstract(), "cannot compile abstract methods");
 971   assert(method->method_holder()->klass_part()->oop_is_instance(),
 972          "sanity check");
 973   assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(),
 974          "method holder must be initialized");
 975 
 976   if (CIPrintRequests) {
 977     tty->print("request: ");
 978     method->print_short_name(tty);
 979     if (osr_bci != InvocationEntryBci) {
 980       tty->print(" osr_bci: %d", osr_bci);
 981     }
 982     tty->print(" comment: %s count: %d", comment, hot_count);
 983     if (!hot_method.is_null()) {
 984       tty->print(" hot: ");
 985       if (hot_method() != method()) {
 986           hot_method->print_short_name(tty);
 987       } else {
 988         tty->print("yes");
 989       }
 990     }
 991     tty->cr();
 992   }
 993 
 994   // A request has been made for compilation.  Before we do any
 995   // real work, check to see if the method has been compiled
 996   // in the meantime with a definitive result.
 997   if (compilation_is_complete(method, osr_bci, comp_level)) {
 998     return;
 999   }
1000 
1001 #ifndef PRODUCT
1002   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1003     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1004       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1005       return;
1006     }
1007   }
1008 #endif
1009 
1010   // If this method is already in the compile queue, then
1011   // we do not block the current thread.
1012   if (compilation_is_in_queue(method, osr_bci)) {
1013     // We may want to decay our counter a bit here to prevent
1014     // multiple denied requests for compilation.  This is an
1015     // open compilation policy issue. Note: The other possibility,
1016     // in the case that this is a blocking compile request, is to have
1017     // all subsequent blocking requesters wait for completion of
1018     // ongoing compiles. Note that in this case we'll need a protocol
1019     // for freeing the associated compile tasks. [Or we could have
1020     // a single static monitor on which all these waiters sleep.]
1021     return;
1022   }
1023 
1024   // If the requesting thread is holding the pending list lock
1025   // then we just return. We can't risk blocking while holding
1026   // the pending list lock or a 3-way deadlock may occur
1027   // between the reference handler thread, a GC (instigated
1028   // by a compiler thread), and compiled method registration.
1029   if (instanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1030     return;
1031   }
1032 
1033   // Outputs from the following MutexLocker block:
1034   CompileTask* task     = NULL;
1035   bool         blocking = false;
1036   CompileQueue* queue  = compile_queue(comp_level);
1037 
1038   // Acquire our lock.
1039   {
1040     MutexLocker locker(queue->lock(), THREAD);
1041 
1042     // Make sure the method has not slipped into the queues since
1043     // last we checked; note that those checks were "fast bail-outs".
1044     // Here we need to be more careful, see 14012000 below.
1045     if (compilation_is_in_queue(method, osr_bci)) {
1046       return;
1047     }
1048 
1049     // We need to check again to see if the compilation has
1050     // completed.  A previous compilation may have registered
1051     // some result.
1052     if (compilation_is_complete(method, osr_bci, comp_level)) {
1053       return;
1054     }
1055 
1056     // We now know that this compilation is not pending, complete,
1057     // or prohibited.  Assign a compile_id to this compilation
1058     // and check to see if it is in our [Start..Stop) range.
1059     uint compile_id = assign_compile_id(method, osr_bci);
1060     if (compile_id == 0) {
1061       // The compilation falls outside the allowed range.
1062       return;
1063     }
1064 
1065     // Should this thread wait for completion of the compile?
1066     blocking = is_compile_blocking(method, osr_bci);
1067 
1068     // We will enter the compilation in the queue.
1069     // 14012000: Note that this sets the queued_for_compile bits in
1070     // the target method. We can now reason that a method cannot be
1071     // queued for compilation more than once, as follows:
1072     // Before a thread queues a task for compilation, it first acquires
1073     // the compile queue lock, then checks if the method's queued bits
1074     // are set or it has already been compiled. Thus there can not be two
1075     // instances of a compilation task for the same method on the
1076     // compilation queue. Consider now the case where the compilation
1077     // thread has already removed a task for that method from the queue
1078     // and is in the midst of compiling it. In this case, the
1079     // queued_for_compile bits must be set in the method (and these
1080     // will be visible to the current thread, since the bits were set
1081     // under protection of the compile queue lock, which we hold now.
1082     // When the compilation completes, the compiler thread first sets
1083     // the compilation result and then clears the queued_for_compile
1084     // bits. Neither of these actions are protected by a barrier (or done
1085     // under the protection of a lock), so the only guarantee we have
1086     // (on machines with TSO (Total Store Order)) is that these values
1087     // will update in that order. As a result, the only combinations of
1088     // these bits that the current thread will see are, in temporal order:
1089     // <RESULT, QUEUE> :
1090     //     <0, 1> : in compile queue, but not yet compiled
1091     //     <1, 1> : compiled but queue bit not cleared
1092     //     <1, 0> : compiled and queue bit cleared
1093     // Because we first check the queue bits then check the result bits,
1094     // we are assured that we cannot introduce a duplicate task.
1095     // Note that if we did the tests in the reverse order (i.e. check
1096     // result then check queued bit), we could get the result bit before
1097     // the compilation completed, and the queue bit after the compilation
1098     // completed, and end up introducing a "duplicate" (redundant) task.
1099     // In that case, the compiler thread should first check if a method
1100     // has already been compiled before trying to compile it.
1101     // NOTE: in the event that there are multiple compiler threads and
1102     // there is de-optimization/recompilation, things will get hairy,
1103     // and in that case it's best to protect both the testing (here) of
1104     // these bits, and their updating (here and elsewhere) under a
1105     // common lock.
1106     task = create_compile_task(queue,
1107                                compile_id, method,
1108                                osr_bci, comp_level,
1109                                hot_method, hot_count, comment,
1110                                blocking);
1111   }
1112 
1113   if (blocking) {
1114     wait_for_completion(task);
1115   }
1116 }
1117 
1118 
1119 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1120                                        int comp_level,
1121                                        methodHandle hot_method, int hot_count,
1122                                        const char* comment, TRAPS) {
1123   // make sure arguments make sense
1124   assert(method->method_holder()->klass_part()->oop_is_instance(), "not an instance method");
1125   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1126   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1127   assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(), "method holder must be initialized");
1128 
1129   if (!TieredCompilation) {
1130     comp_level = CompLevel_highest_tier;
1131   }
1132 
1133   // return quickly if possible
1134 
1135   // lock, make sure that the compilation
1136   // isn't prohibited in a straightforward way.
1137 
1138   if (compiler(comp_level) == NULL || compilation_is_prohibited(method, osr_bci, comp_level)) {
1139     return NULL;
1140   }
1141 
1142   if (osr_bci == InvocationEntryBci) {
1143     // standard compilation
1144     nmethod* method_code = method->code();
1145     if (method_code != NULL) {
1146       if (compilation_is_complete(method, osr_bci, comp_level)) {
1147         return method_code;
1148       }
1149     }
1150     if (method->is_not_compilable(comp_level)) return NULL;
1151 
1152     if (UseCodeCacheFlushing) {
1153       nmethod* saved = CodeCache::find_and_remove_saved_code(method());
1154       if (saved != NULL) {
1155         method->set_code(method, saved);
1156         return saved;
1157       }
1158     }
1159 
1160   } else {
1161     // osr compilation
1162 #ifndef TIERED
1163     // seems like an assert of dubious value
1164     assert(comp_level == CompLevel_highest_tier,
1165            "all OSR compiles are assumed to be at a single compilation lavel");
1166 #endif // TIERED
1167     // We accept a higher level osr method
1168     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1169     if (nm != NULL) return nm;
1170     if (method->is_not_osr_compilable()) return NULL;
1171   }
1172 
1173   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1174   // some prerequisites that are compiler specific
1175   if (compiler(comp_level)->is_c2() || compiler(comp_level)->is_shark()) {
1176     method->constants()->resolve_string_constants(CHECK_0);
1177     // Resolve all classes seen in the signature of the method
1178     // we are compiling.
1179     methodOopDesc::load_signature_classes(method, CHECK_0);
1180   }
1181 
1182   // If the method is native, do the lookup in the thread requesting
1183   // the compilation. Native lookups can load code, which is not
1184   // permitted during compilation.
1185   //
1186   // Note: A native method implies non-osr compilation which is
1187   //       checked with an assertion at the entry of this method.
1188   if (method->is_native()) {
1189     bool in_base_library;
1190     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1191     if (HAS_PENDING_EXCEPTION) {
1192       // In case of an exception looking up the method, we just forget
1193       // about it. The interpreter will kick-in and throw the exception.
1194       method->set_not_compilable(); // implies is_not_osr_compilable()
1195       CLEAR_PENDING_EXCEPTION;
1196       return NULL;
1197     }
1198     assert(method->has_native_function(), "must have native code by now");
1199   }
1200 
1201   // RedefineClasses() has replaced this method; just return
1202   if (method->is_old()) {
1203     return NULL;
1204   }
1205 
1206   // JVMTI -- post_compile_event requires jmethod_id() that may require
1207   // a lock the compiling thread can not acquire. Prefetch it here.
1208   if (JvmtiExport::should_post_compiled_method_load()) {
1209     method->jmethod_id();
1210   }
1211 
1212   // If the compiler is shut off due to code cache flushing or otherwise,
1213   // fail out now so blocking compiles dont hang the java thread
1214   if (!should_compile_new_jobs() || (UseCodeCacheFlushing && CodeCache::needs_flushing())) {
1215     CompilationPolicy::policy()->delay_compilation(method());
1216     return NULL;
1217   }
1218 
1219   // do the compilation
1220   if (method->is_native()) {
1221     if (!PreferInterpreterNativeStubs) {
1222       // Acquire our lock.
1223       int compile_id;
1224       {
1225         MutexLocker locker(MethodCompileQueue_lock, THREAD);
1226         compile_id = assign_compile_id(method, standard_entry_bci);
1227       }
1228       (void) AdapterHandlerLibrary::create_native_wrapper(method, compile_id);
1229     } else {
1230       return NULL;
1231     }
1232   } else {
1233     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, CHECK_0);
1234   }
1235 
1236   // return requested nmethod
1237   // We accept a higher level osr method
1238   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1239 }
1240 
1241 
1242 // ------------------------------------------------------------------
1243 // CompileBroker::compilation_is_complete
1244 //
1245 // See if compilation of this method is already complete.
1246 bool CompileBroker::compilation_is_complete(methodHandle method,
1247                                             int          osr_bci,
1248                                             int          comp_level) {
1249   bool is_osr = (osr_bci != standard_entry_bci);
1250   if (is_osr) {
1251     if (method->is_not_osr_compilable()) {
1252       return true;
1253     } else {
1254       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1255       return (result != NULL);
1256     }
1257   } else {
1258     if (method->is_not_compilable(comp_level)) {
1259       return true;
1260     } else {
1261       nmethod* result = method->code();
1262       if (result == NULL) return false;
1263       return comp_level == result->comp_level();
1264     }
1265   }
1266 }
1267 
1268 
1269 // ------------------------------------------------------------------
1270 // CompileBroker::compilation_is_in_queue
1271 //
1272 // See if this compilation is already requested.
1273 //
1274 // Implementation note: there is only a single "is in queue" bit
1275 // for each method.  This means that the check below is overly
1276 // conservative in the sense that an osr compilation in the queue
1277 // will block a normal compilation from entering the queue (and vice
1278 // versa).  This can be remedied by a full queue search to disambiguate
1279 // cases.  If it is deemed profitible, this may be done.
1280 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1281                                             int          osr_bci) {
1282   return method->queued_for_compilation();
1283 }
1284 
1285 // ------------------------------------------------------------------
1286 // CompileBroker::compilation_is_prohibited
1287 //
1288 // See if this compilation is not allowed.
1289 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1290   bool is_native = method->is_native();
1291   // Some compilers may not support the compilation of natives.
1292   if (is_native &&
1293       (!CICompileNatives || !compiler(comp_level)->supports_native())) {
1294     method->set_not_compilable_quietly(comp_level);
1295     return true;
1296   }
1297 
1298   bool is_osr = (osr_bci != standard_entry_bci);
1299   // Some compilers may not support on stack replacement.
1300   if (is_osr &&
1301       (!CICompileOSR || !compiler(comp_level)->supports_osr())) {
1302     method->set_not_osr_compilable();
1303     return true;
1304   }
1305 
1306   // The method may be explicitly excluded by the user.
1307   bool quietly;
1308   if (CompilerOracle::should_exclude(method, quietly)) {
1309     if (!quietly) {
1310       // This does not happen quietly...
1311       ResourceMark rm;
1312       tty->print("### Excluding %s:%s",
1313                  method->is_native() ? "generation of native wrapper" : "compile",
1314                  (method->is_static() ? " static" : ""));
1315       method->print_short_name(tty);
1316       tty->cr();
1317     }
1318     method->set_not_compilable_quietly();
1319   }
1320 
1321   return false;
1322 }
1323 
1324 
1325 // ------------------------------------------------------------------
1326 // CompileBroker::assign_compile_id
1327 //
1328 // Assign a serialized id number to this compilation request.  If the
1329 // number falls out of the allowed range, return a 0.  OSR
1330 // compilations may be numbered separately from regular compilations
1331 // if certain debugging flags are used.
1332 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1333   assert(MethodCompileQueue_lock->owner() == Thread::current(),
1334          "must hold the compilation queue lock");
1335   bool is_osr = (osr_bci != standard_entry_bci);
1336   uint id;
1337   if (CICountOSR && is_osr) {
1338     id = ++_osr_compilation_id;
1339     if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1340       return id;
1341     }
1342   } else {
1343     id = ++_compilation_id;
1344     if ((uint)CIStart <= id && id < (uint)CIStop) {
1345       return id;
1346     }
1347   }
1348 
1349   // Method was not in the appropriate compilation range.
1350   method->set_not_compilable_quietly();
1351   return 0;
1352 }
1353 
1354 
1355 // ------------------------------------------------------------------
1356 // CompileBroker::is_compile_blocking
1357 //
1358 // Should the current thread be blocked until this compilation request
1359 // has been fulfilled?
1360 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1361   assert(!instanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1362   return !BackgroundCompilation;
1363 }
1364 
1365 
1366 // ------------------------------------------------------------------
1367 // CompileBroker::preload_classes
1368 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1369   // Move this code over from c1_Compiler.cpp
1370   ShouldNotReachHere();
1371 }
1372 
1373 
1374 // ------------------------------------------------------------------
1375 // CompileBroker::create_compile_task
1376 //
1377 // Create a CompileTask object representing the current request for
1378 // compilation.  Add this task to the queue.
1379 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1380                                               int           compile_id,
1381                                               methodHandle  method,
1382                                               int           osr_bci,
1383                                               int           comp_level,
1384                                               methodHandle  hot_method,
1385                                               int           hot_count,
1386                                               const char*   comment,
1387                                               bool          blocking) {
1388   CompileTask* new_task = allocate_task();
1389   new_task->initialize(compile_id, method, osr_bci, comp_level,
1390                        hot_method, hot_count, comment,
1391                        blocking);
1392   queue->add(new_task);
1393   return new_task;
1394 }
1395 
1396 
1397 // ------------------------------------------------------------------
1398 // CompileBroker::allocate_task
1399 //
1400 // Allocate a CompileTask, from the free list if possible.
1401 CompileTask* CompileBroker::allocate_task() {
1402   MutexLocker locker(CompileTaskAlloc_lock);
1403   CompileTask* task = NULL;
1404   if (_task_free_list != NULL) {
1405     task = _task_free_list;
1406     _task_free_list = task->next();
1407     task->set_next(NULL);
1408   } else {
1409     task = new CompileTask();
1410     task->set_next(NULL);
1411   }
1412   return task;
1413 }
1414 
1415 
1416 // ------------------------------------------------------------------
1417 // CompileBroker::free_task
1418 //
1419 // Add a task to the free list.
1420 void CompileBroker::free_task(CompileTask* task) {
1421   MutexLocker locker(CompileTaskAlloc_lock);
1422   task->free();
1423   task->set_next(_task_free_list);
1424   _task_free_list = task;
1425 }
1426 
1427 
1428 // ------------------------------------------------------------------
1429 // CompileBroker::wait_for_completion
1430 //
1431 // Wait for the given method CompileTask to complete.
1432 void CompileBroker::wait_for_completion(CompileTask* task) {
1433   if (CIPrintCompileQueue) {
1434     tty->print_cr("BLOCKING FOR COMPILE");
1435   }
1436 
1437   assert(task->is_blocking(), "can only wait on blocking task");
1438 
1439   JavaThread *thread = JavaThread::current();
1440   thread->set_blocked_on_compilation(true);
1441 
1442   methodHandle method(thread,
1443                       (methodOop)JNIHandles::resolve(task->method_handle()));
1444   {
1445     MutexLocker waiter(task->lock(), thread);
1446 
1447     while (!task->is_complete())
1448       task->lock()->wait();
1449   }
1450   // It is harmless to check this status without the lock, because
1451   // completion is a stable property (until the task object is recycled).
1452   assert(task->is_complete(), "Compilation should have completed");
1453   assert(task->code_handle() == NULL, "must be reset");
1454 
1455   thread->set_blocked_on_compilation(false);
1456 
1457   // By convention, the waiter is responsible for recycling a
1458   // blocking CompileTask. Since there is only one waiter ever
1459   // waiting on a CompileTask, we know that no one else will
1460   // be using this CompileTask; we can free it.
1461   free_task(task);
1462 }
1463 
1464 // ------------------------------------------------------------------
1465 // CompileBroker::compiler_thread_loop
1466 //
1467 // The main loop run by a CompilerThread.
1468 void CompileBroker::compiler_thread_loop() {
1469   CompilerThread* thread = CompilerThread::current();
1470   CompileQueue* queue = thread->queue();
1471 
1472   // For the thread that initializes the ciObjectFactory
1473   // this resource mark holds all the shared objects
1474   ResourceMark rm;
1475 
1476   // First thread to get here will initialize the compiler interface
1477 
1478   if (!ciObjectFactory::is_initialized()) {
1479     ASSERT_IN_VM;
1480     MutexLocker only_one (CompileThread_lock, thread);
1481     if (!ciObjectFactory::is_initialized()) {
1482       ciObjectFactory::initialize();
1483     }
1484   }
1485 
1486   // Open a log.
1487   if (LogCompilation) {
1488     init_compiler_thread_log();
1489   }
1490   CompileLog* log = thread->log();
1491   if (log != NULL) {
1492     log->begin_elem("start_compile_thread thread='" UINTX_FORMAT "' process='%d'",
1493                     os::current_thread_id(),
1494                     os::current_process_id());
1495     log->stamp();
1496     log->end_elem();
1497   }
1498 
1499   while (true) {
1500     {
1501       // We need this HandleMark to avoid leaking VM handles.
1502       HandleMark hm(thread);
1503 
1504       if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) {
1505         // the code cache is really full
1506         handle_full_code_cache();
1507       } else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
1508         // Attempt to start cleaning the code cache while there is still a little headroom
1509         NMethodSweeper::handle_full_code_cache(false);
1510       }
1511 
1512       CompileTask* task = queue->get();
1513 
1514       // Give compiler threads an extra quanta.  They tend to be bursty and
1515       // this helps the compiler to finish up the job.
1516       if( CompilerThreadHintNoPreempt )
1517         os::hint_no_preempt();
1518 
1519       // trace per thread time and compile statistics
1520       CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1521       PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1522 
1523       // Assign the task to the current thread.  Mark this compilation
1524       // thread as active for the profiler.
1525       CompileTaskWrapper ctw(task);
1526       nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1527       task->set_code_handle(&result_handle);
1528       methodHandle method(thread,
1529                      (methodOop)JNIHandles::resolve(task->method_handle()));
1530 
1531       // Never compile a method if breakpoints are present in it
1532       if (method()->number_of_breakpoints() == 0) {
1533         // Compile the method.
1534         if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1535 #ifdef COMPILER1
1536           // Allow repeating compilations for the purpose of benchmarking
1537           // compile speed. This is not useful for customers.
1538           if (CompilationRepeat != 0) {
1539             int compile_count = CompilationRepeat;
1540             while (compile_count > 0) {
1541               invoke_compiler_on_method(task);
1542               nmethod* nm = method->code();
1543               if (nm != NULL) {
1544                 nm->make_zombie();
1545                 method->clear_code();
1546               }
1547               compile_count--;
1548             }
1549           }
1550 #endif /* COMPILER1 */
1551           invoke_compiler_on_method(task);
1552         } else {
1553           // After compilation is disabled, remove remaining methods from queue
1554           method->clear_queued_for_compilation();
1555         }
1556       }
1557     }
1558   }
1559 }
1560 
1561 
1562 // ------------------------------------------------------------------
1563 // CompileBroker::init_compiler_thread_log
1564 //
1565 // Set up state required by +LogCompilation.
1566 void CompileBroker::init_compiler_thread_log() {
1567     CompilerThread* thread = CompilerThread::current();
1568     char  fileBuf[4*K];
1569     FILE* fp = NULL;
1570     char* file = NULL;
1571     intx thread_id = os::current_thread_id();
1572     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1573       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1574       if (dir == NULL) {
1575         jio_snprintf(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
1576                      thread_id, os::current_process_id());
1577       } else {
1578         jio_snprintf(fileBuf, sizeof(fileBuf),
1579                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1580                      os::file_separator(), thread_id, os::current_process_id());
1581       }
1582       fp = fopen(fileBuf, "at");
1583       if (fp != NULL) {
1584         file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1);
1585         strcpy(file, fileBuf);
1586         break;
1587       }
1588     }
1589     if (fp == NULL) {
1590       warning("Cannot open log file: %s", fileBuf);
1591     } else {
1592       if (LogCompilation && Verbose)
1593         tty->print_cr("Opening compilation log %s", file);
1594       CompileLog* log = new(ResourceObj::C_HEAP) CompileLog(file, fp, thread_id);
1595       thread->init_log(log);
1596 
1597       if (xtty != NULL) {
1598         ttyLocker ttyl;
1599 
1600         // Record any per thread log files
1601         xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file);
1602       }
1603     }
1604 }
1605 
1606 // ------------------------------------------------------------------
1607 // CompileBroker::set_should_block
1608 //
1609 // Set _should_block.
1610 // Call this from the VM, with Threads_lock held and a safepoint requested.
1611 void CompileBroker::set_should_block() {
1612   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1613   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1614 #ifndef PRODUCT
1615   if (PrintCompilation && (Verbose || WizardMode))
1616     tty->print_cr("notifying compiler thread pool to block");
1617 #endif
1618   _should_block = true;
1619 }
1620 
1621 // ------------------------------------------------------------------
1622 // CompileBroker::maybe_block
1623 //
1624 // Call this from the compiler at convenient points, to poll for _should_block.
1625 void CompileBroker::maybe_block() {
1626   if (_should_block) {
1627 #ifndef PRODUCT
1628     if (PrintCompilation && (Verbose || WizardMode))
1629       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1630 #endif
1631     ThreadInVMfromNative tivfn(JavaThread::current());
1632   }
1633 }
1634 
1635 
1636 // ------------------------------------------------------------------
1637 // CompileBroker::invoke_compiler_on_method
1638 //
1639 // Compile a method.
1640 //
1641 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1642   if (PrintCompilation) {
1643     ResourceMark rm;
1644     task->print_line();
1645   }
1646   elapsedTimer time;
1647 
1648   CompilerThread* thread = CompilerThread::current();
1649   ResourceMark rm(thread);
1650 
1651   // Common flags.
1652   uint compile_id = task->compile_id();
1653   int osr_bci = task->osr_bci();
1654   bool is_osr = (osr_bci != standard_entry_bci);
1655   bool should_log = (thread->log() != NULL);
1656   bool should_break = false;
1657   {
1658     // create the handle inside it's own block so it can't
1659     // accidentally be referenced once the thread transitions to
1660     // native.  The NoHandleMark before the transition should catch
1661     // any cases where this occurs in the future.
1662     methodHandle method(thread,
1663                         (methodOop)JNIHandles::resolve(task->method_handle()));
1664     should_break = check_break_at(method, compile_id, is_osr);
1665     if (should_log && !CompilerOracle::should_log(method)) {
1666       should_log = false;
1667     }
1668     assert(!method->is_native(), "no longer compile natives");
1669 
1670     // Save information about this method in case of failure.
1671     set_last_compile(thread, method, is_osr, task->comp_level());
1672 
1673     DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler(task->comp_level()), method);
1674   }
1675 
1676   // Allocate a new set of JNI handles.
1677   push_jni_handle_block();
1678   jobject target_handle = JNIHandles::make_local(thread, JNIHandles::resolve(task->method_handle()));
1679   int compilable = ciEnv::MethodCompilable;
1680   {
1681     int system_dictionary_modification_counter;
1682     {
1683       MutexLocker locker(Compile_lock, thread);
1684       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1685     }
1686 
1687     NoHandleMark  nhm;
1688     ThreadToNativeFromVM ttn(thread);
1689 
1690     ciEnv ci_env(task, system_dictionary_modification_counter);
1691     if (should_break) {
1692       ci_env.set_break_at_compile(true);
1693     }
1694     if (should_log) {
1695       ci_env.set_log(thread->log());
1696     }
1697     assert(thread->env() == &ci_env, "set by ci_env");
1698     // The thread-env() field is cleared in ~CompileTaskWrapper.
1699 
1700     // Cache Jvmti state
1701     ci_env.cache_jvmti_state();
1702 
1703     // Cache DTrace flags
1704     ci_env.cache_dtrace_flags();
1705 
1706     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1707 
1708     TraceTime t1("compilation", &time);
1709 
1710     compiler(task->comp_level())->compile_method(&ci_env, target, osr_bci);
1711 
1712     if (!ci_env.failing() && task->code() == NULL) {
1713       //assert(false, "compiler should always document failure");
1714       // The compiler elected, without comment, not to register a result.
1715       // Do not attempt further compilations of this method.
1716       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1717     }
1718 
1719     if (ci_env.failing()) {
1720       // Copy this bit to the enclosing block:
1721       compilable = ci_env.compilable();
1722       if (PrintCompilation) {
1723         const char* reason = ci_env.failure_reason();
1724         if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1725           tty->print_cr("%4d   COMPILE SKIPPED: %s (retry at different tier)", compile_id, reason);
1726         } else if (compilable == ciEnv::MethodCompilable_never) {
1727           tty->print_cr("%4d   COMPILE SKIPPED: %s (not retryable)", compile_id, reason);
1728         } else if (compilable == ciEnv::MethodCompilable) {
1729           tty->print_cr("%4d   COMPILE SKIPPED: %s", compile_id, reason);
1730         }
1731       }
1732     } else {
1733       task->mark_success();
1734       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1735     }
1736   }
1737   pop_jni_handle_block();
1738 
1739   methodHandle method(thread,
1740                       (methodOop)JNIHandles::resolve(task->method_handle()));
1741 
1742   DTRACE_METHOD_COMPILE_END_PROBE(compiler(task->comp_level()), method, task->is_success());
1743 
1744   collect_statistics(thread, time, task);
1745 
1746   if (PrintCompilation && PrintCompilation2) {
1747     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
1748     tty->print("%4d ", compile_id);    // print compilation number
1749     tty->print("%s ", (is_osr ? "%" : " "));
1750     int code_size = (task->code() == NULL) ? 0 : task->code()->total_size();
1751     tty->print_cr("size: %d time: %d inlined: %d bytes", code_size, (int)time.milliseconds(), task->num_inlined_bytecodes());
1752   }
1753 
1754   if (compilable == ciEnv::MethodCompilable_never) {
1755     if (is_osr) {
1756       method->set_not_osr_compilable();
1757     } else {
1758       method->set_not_compilable_quietly();
1759     }
1760   } else if (compilable == ciEnv::MethodCompilable_not_at_tier) {
1761     method->set_not_compilable_quietly(task->comp_level());
1762   }
1763 
1764   // Note that the queued_for_compilation bits are cleared without
1765   // protection of a mutex. [They were set by the requester thread,
1766   // when adding the task to the complie queue -- at which time the
1767   // compile queue lock was held. Subsequently, we acquired the compile
1768   // queue lock to get this task off the compile queue; thus (to belabour
1769   // the point somewhat) our clearing of the bits must be occurring
1770   // only after the setting of the bits. See also 14012000 above.
1771   method->clear_queued_for_compilation();
1772 
1773 #ifdef ASSERT
1774   if (CollectedHeap::fired_fake_oom()) {
1775     // The current compile received a fake OOM during compilation so
1776     // go ahead and exit the VM since the test apparently succeeded
1777     tty->print_cr("*** Shutting down VM after successful fake OOM");
1778     vm_exit(0);
1779   }
1780 #endif
1781 }
1782 
1783 // ------------------------------------------------------------------
1784 // CompileBroker::handle_full_code_cache
1785 //
1786 // The CodeCache is full.  Print out warning and disable compilation or
1787 // try code cache cleaning so compilation can continue later.
1788 void CompileBroker::handle_full_code_cache() {
1789   UseInterpreter = true;
1790   if (UseCompiler || AlwaysCompileLoopMethods ) {
1791     if (xtty != NULL) {
1792       stringStream s;
1793       // Dump code cache state into a buffer before locking the tty,
1794       // because log_state() will use locks causing lock conflicts.
1795       CodeCache::log_state(&s);
1796       // Lock to prevent tearing
1797       ttyLocker ttyl;
1798       xtty->begin_elem("code_cache_full");
1799       xtty->print(s.as_string());
1800       xtty->stamp();
1801       xtty->end_elem();
1802     }
1803     warning("CodeCache is full. Compiler has been disabled.");
1804     warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1805     CodeCache::print_bounds(tty);
1806 #ifndef PRODUCT
1807     if (CompileTheWorld || ExitOnFullCodeCache) {
1808       before_exit(JavaThread::current());
1809       exit_globals(); // will delete tty
1810       vm_direct_exit(CompileTheWorld ? 0 : 1);
1811     }
1812 #endif
1813     if (UseCodeCacheFlushing) {
1814       NMethodSweeper::handle_full_code_cache(true);
1815     } else {
1816       UseCompiler               = false;
1817       AlwaysCompileLoopMethods  = false;
1818     }
1819   }
1820 }
1821 
1822 // ------------------------------------------------------------------
1823 // CompileBroker::set_last_compile
1824 //
1825 // Record this compilation for debugging purposes.
1826 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1827   ResourceMark rm;
1828   char* method_name = method->name()->as_C_string();
1829   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1830   char current_method[CompilerCounters::cmname_buffer_length];
1831   size_t maxLen = CompilerCounters::cmname_buffer_length;
1832 
1833   if (UsePerfData) {
1834     const char* class_name = method->method_holder()->klass_part()->name()->as_C_string();
1835 
1836     size_t s1len = strlen(class_name);
1837     size_t s2len = strlen(method_name);
1838 
1839     // check if we need to truncate the string
1840     if (s1len + s2len + 2 > maxLen) {
1841 
1842       // the strategy is to lop off the leading characters of the
1843       // class name and the trailing characters of the method name.
1844 
1845       if (s2len + 2 > maxLen) {
1846         // lop of the entire class name string, let snprintf handle
1847         // truncation of the method name.
1848         class_name += s1len; // null string
1849       }
1850       else {
1851         // lop off the extra characters from the front of the class name
1852         class_name += ((s1len + s2len + 2) - maxLen);
1853       }
1854     }
1855 
1856     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1857   }
1858 
1859   if (CICountOSR && is_osr) {
1860     _last_compile_type = osr_compile;
1861   } else {
1862     _last_compile_type = normal_compile;
1863   }
1864   _last_compile_level = comp_level;
1865 
1866   if (UsePerfData) {
1867     CompilerCounters* counters = thread->counters();
1868     counters->set_current_method(current_method);
1869     counters->set_compile_type((jlong)_last_compile_type);
1870   }
1871 }
1872 
1873 
1874 // ------------------------------------------------------------------
1875 // CompileBroker::push_jni_handle_block
1876 //
1877 // Push on a new block of JNI handles.
1878 void CompileBroker::push_jni_handle_block() {
1879   JavaThread* thread = JavaThread::current();
1880 
1881   // Allocate a new block for JNI handles.
1882   // Inlined code from jni_PushLocalFrame()
1883   JNIHandleBlock* java_handles = thread->active_handles();
1884   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
1885   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
1886   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
1887   thread->set_active_handles(compile_handles);
1888 }
1889 
1890 
1891 // ------------------------------------------------------------------
1892 // CompileBroker::pop_jni_handle_block
1893 //
1894 // Pop off the current block of JNI handles.
1895 void CompileBroker::pop_jni_handle_block() {
1896   JavaThread* thread = JavaThread::current();
1897 
1898   // Release our JNI handle block
1899   JNIHandleBlock* compile_handles = thread->active_handles();
1900   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
1901   thread->set_active_handles(java_handles);
1902   compile_handles->set_pop_frame_link(NULL);
1903   JNIHandleBlock::release_block(compile_handles, thread); // may block
1904 }
1905 
1906 
1907 // ------------------------------------------------------------------
1908 // CompileBroker::check_break_at
1909 //
1910 // Should the compilation break at the current compilation.
1911 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
1912   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
1913     return true;
1914   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
1915     return true;
1916   } else {
1917     return (compile_id == CIBreakAt);
1918   }
1919 }
1920 
1921 // ------------------------------------------------------------------
1922 // CompileBroker::collect_statistics
1923 //
1924 // Collect statistics about the compilation.
1925 
1926 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
1927   bool success = task->is_success();
1928   methodHandle method (thread, (methodOop)JNIHandles::resolve(task->method_handle()));
1929   uint compile_id = task->compile_id();
1930   bool is_osr = (task->osr_bci() != standard_entry_bci);
1931   nmethod* code = task->code();
1932   CompilerCounters* counters = thread->counters();
1933 
1934   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
1935   MutexLocker locker(CompileStatistics_lock);
1936 
1937   // _perf variables are production performance counters which are
1938   // updated regardless of the setting of the CITime and CITimeEach flags
1939   //
1940   if (!success) {
1941     _total_bailout_count++;
1942     if (UsePerfData) {
1943       _perf_last_failed_method->set_value(counters->current_method());
1944       _perf_last_failed_type->set_value(counters->compile_type());
1945       _perf_total_bailout_count->inc();
1946     }
1947   } else if (code == NULL) {
1948     if (UsePerfData) {
1949       _perf_last_invalidated_method->set_value(counters->current_method());
1950       _perf_last_invalidated_type->set_value(counters->compile_type());
1951       _perf_total_invalidated_count->inc();
1952     }
1953     _total_invalidated_count++;
1954   } else {
1955     // Compilation succeeded
1956 
1957     // update compilation ticks - used by the implementation of
1958     // java.lang.management.CompilationMBean
1959     _perf_total_compilation->inc(time.ticks());
1960 
1961     if (CITime) {
1962       _t_total_compilation.add(time);
1963       if (is_osr) {
1964         _t_osr_compilation.add(time);
1965         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1966       } else {
1967         _t_standard_compilation.add(time);
1968         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
1969       }
1970     }
1971 
1972     if (UsePerfData) {
1973       // save the name of the last method compiled
1974       _perf_last_method->set_value(counters->current_method());
1975       _perf_last_compile_type->set_value(counters->compile_type());
1976       _perf_last_compile_size->set_value(method->code_size() +
1977                                          task->num_inlined_bytecodes());
1978       if (is_osr) {
1979         _perf_osr_compilation->inc(time.ticks());
1980         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1981       } else {
1982         _perf_standard_compilation->inc(time.ticks());
1983         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
1984       }
1985     }
1986 
1987     if (CITimeEach) {
1988       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
1989       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
1990                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
1991     }
1992 
1993     // Collect counts of successful compilations
1994     _sum_nmethod_size      += code->total_size();
1995     _sum_nmethod_code_size += code->insts_size();
1996     _total_compile_count++;
1997 
1998     if (UsePerfData) {
1999       _perf_sum_nmethod_size->inc(     code->total_size());
2000       _perf_sum_nmethod_code_size->inc(code->insts_size());
2001       _perf_total_compile_count->inc();
2002     }
2003 
2004     if (is_osr) {
2005       if (UsePerfData) _perf_total_osr_compile_count->inc();
2006       _total_osr_compile_count++;
2007     } else {
2008       if (UsePerfData) _perf_total_standard_compile_count->inc();
2009       _total_standard_compile_count++;
2010     }
2011   }
2012   // set the current method for the thread to null
2013   if (UsePerfData) counters->set_current_method("");
2014 }
2015 
2016 
2017 
2018 void CompileBroker::print_times() {
2019   tty->cr();
2020   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2021   tty->print_cr("------------------------------------------------");
2022                //0000000000111111111122222222223333333333444444444455555555556666666666
2023                //0123456789012345678901234567890123456789012345678901234567890123456789
2024   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2025   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2026                 CompileBroker::_t_standard_compilation.seconds(),
2027                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2028   tty->print_cr("    On stack replacement   : %6.3f s, Average : %2.3f", CompileBroker::_t_osr_compilation.seconds(), CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2029 
2030   if (compiler(CompLevel_simple) != NULL) {
2031     compiler(CompLevel_simple)->print_timers();
2032   }
2033   if (compiler(CompLevel_full_optimization) != NULL) {
2034     compiler(CompLevel_full_optimization)->print_timers();
2035   }
2036   tty->cr();
2037   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2038   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2039   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2040   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2041   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2042   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2043   tty->cr();
2044   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2045   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2046 }
2047 
2048 
2049 // Debugging output for failure
2050 void CompileBroker::print_last_compile() {
2051   if ( _last_compile_level != CompLevel_none &&
2052        compiler(_last_compile_level) != NULL &&
2053        _last_method_compiled != NULL &&
2054        _last_compile_type != no_compile) {
2055     if (_last_compile_type == osr_compile) {
2056       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2057                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2058     } else {
2059       tty->print_cr("Last parse:  %d+++(%d) %s",
2060                     _compilation_id, _last_compile_level, _last_method_compiled);
2061     }
2062   }
2063 }
2064 
2065 
2066 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2067 #ifndef PRODUCT
2068   st->print_cr("Compiler thread printing unimplemented.");
2069   st->cr();
2070 #endif
2071 }