1 /*
   2  * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "classfile/vmSymbols.hpp"
  28 #include "code/codeCache.hpp"
  29 #include "compiler/compileBroker.hpp"
  30 #include "compiler/compileLog.hpp"
  31 #include "compiler/compilerOracle.hpp"
  32 #include "interpreter/linkResolver.hpp"
  33 #include "memory/allocation.inline.hpp"
  34 #include "oops/methodData.hpp"
  35 #include "oops/method.hpp"
  36 #include "oops/oop.inline.hpp"
  37 #include "prims/nativeLookup.hpp"
  38 #include "runtime/arguments.hpp"
  39 #include "runtime/atomic.inline.hpp"
  40 #include "runtime/compilationPolicy.hpp"
  41 #include "runtime/init.hpp"
  42 #include "runtime/interfaceSupport.hpp"
  43 #include "runtime/javaCalls.hpp"
  44 #include "runtime/os.hpp"
  45 #include "runtime/sharedRuntime.hpp"
  46 #include "runtime/sweeper.hpp"
  47 #include "trace/tracing.hpp"
  48 #include "utilities/dtrace.hpp"
  49 #include "utilities/events.hpp"
  50 #ifdef COMPILER1
  51 #include "c1/c1_Compiler.hpp"
  52 #endif
  53 #ifdef COMPILER2
  54 #include "opto/c2compiler.hpp"
  55 #endif
  56 #ifdef SHARK
  57 #include "shark/sharkCompiler.hpp"
  58 #endif
  59 
  60 #ifdef DTRACE_ENABLED
  61 
  62 // Only bother with this argument setup if dtrace is available
  63 
  64 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \
  65   {                                                                      \
  66     Symbol* klass_name = (method)->klass_name();                         \
  67     Symbol* name = (method)->name();                                     \
  68     Symbol* signature = (method)->signature();                           \
  69     HOTSPOT_METHOD_COMPILE_BEGIN(                                        \
  70       (char *) comp_name, strlen(comp_name),                             \
  71       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
  72       (char *) name->bytes(), name->utf8_length(),                       \
  73       (char *) signature->bytes(), signature->utf8_length());            \
  74   }
  75 
  76 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \
  77   {                                                                      \
  78     Symbol* klass_name = (method)->klass_name();                         \
  79     Symbol* name = (method)->name();                                     \
  80     Symbol* signature = (method)->signature();                           \
  81     HOTSPOT_METHOD_COMPILE_END(                                          \
  82       (char *) comp_name, strlen(comp_name),                             \
  83       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
  84       (char *) name->bytes(), name->utf8_length(),                       \
  85       (char *) signature->bytes(), signature->utf8_length(), (success)); \
  86   }
  87 
  88 #else //  ndef DTRACE_ENABLED
  89 
  90 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
  91 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
  92 
  93 #endif // ndef DTRACE_ENABLED
  94 
  95 bool CompileBroker::_initialized = false;
  96 volatile bool CompileBroker::_should_block = false;
  97 volatile jint CompileBroker::_print_compilation_warning = 0;
  98 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
  99 
 100 // The installed compiler(s)
 101 AbstractCompiler* CompileBroker::_compilers[2];
 102 
 103 // These counters are used to assign an unique ID to each compilation.
 104 volatile jint CompileBroker::_compilation_id     = 0;
 105 volatile jint CompileBroker::_osr_compilation_id = 0;
 106 
 107 // Debugging information
 108 int  CompileBroker::_last_compile_type     = no_compile;
 109 int  CompileBroker::_last_compile_level    = CompLevel_none;
 110 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 111 
 112 // Performance counters
 113 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 114 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 115 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 116 
 117 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 118 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 119 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 120 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 121 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 122 
 123 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 124 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 125 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 126 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 127 
 128 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 129 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 130 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 131 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 132 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 133 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 134 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 135 
 136 // Timers and counters for generating statistics
 137 elapsedTimer CompileBroker::_t_total_compilation;
 138 elapsedTimer CompileBroker::_t_osr_compilation;
 139 elapsedTimer CompileBroker::_t_standard_compilation;
 140 
 141 int CompileBroker::_total_bailout_count          = 0;
 142 int CompileBroker::_total_invalidated_count      = 0;
 143 int CompileBroker::_total_compile_count          = 0;
 144 int CompileBroker::_total_osr_compile_count      = 0;
 145 int CompileBroker::_total_standard_compile_count = 0;
 146 
 147 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 148 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 149 int CompileBroker::_sum_nmethod_size             = 0;
 150 int CompileBroker::_sum_nmethod_code_size        = 0;
 151 
 152 long CompileBroker::_peak_compilation_time       = 0;
 153 
 154 CompileQueue* CompileBroker::_c2_compile_queue   = NULL;
 155 CompileQueue* CompileBroker::_c1_compile_queue   = NULL;
 156 
 157 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;
 158 
 159 
 160 class CompilationLog : public StringEventLog {
 161  public:
 162   CompilationLog() : StringEventLog("Compilation events") {
 163   }
 164 
 165   void log_compile(JavaThread* thread, CompileTask* task) {
 166     StringLogMessage lm;
 167     stringStream sstr = lm.stream();
 168     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 169     task->print_compilation(&sstr, NULL, true, false);
 170     log(thread, "%s", (const char*)lm);
 171   }
 172 
 173   void log_nmethod(JavaThread* thread, nmethod* nm) {
 174     log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 175         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 176         p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
 177   }
 178 
 179   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 180     StringLogMessage lm;
 181     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 182     if (retry_message != NULL) {
 183       lm.append(" (%s)", retry_message);
 184     }
 185     lm.print("\n");
 186     log(thread, "%s", (const char*)lm);
 187   }
 188 };
 189 
 190 static CompilationLog* _compilation_log = NULL;
 191 
 192 void compileBroker_init() {
 193   if (LogEvents) {
 194     _compilation_log = new CompilationLog();
 195   }
 196 }
 197 
 198 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 199   CompilerThread* thread = CompilerThread::current();
 200   thread->set_task(task);
 201   CompileLog*     log  = thread->log();
 202   if (log != NULL)  task->log_task_start(log);
 203 }
 204 
 205 CompileTaskWrapper::~CompileTaskWrapper() {
 206   CompilerThread* thread = CompilerThread::current();
 207   CompileTask* task = thread->task();
 208   CompileLog*  log  = thread->log();
 209   if (log != NULL)  task->log_task_done(log);
 210   thread->set_task(NULL);
 211   task->set_code_handle(NULL);
 212   thread->set_env(NULL);
 213   if (task->is_blocking()) {
 214     MutexLocker notifier(task->lock(), thread);
 215     task->mark_complete();
 216     // Notify the waiting thread that the compilation has completed.
 217     task->lock()->notify_all();
 218   } else {
 219     task->mark_complete();
 220 
 221     // By convention, the compiling thread is responsible for
 222     // recycling a non-blocking CompileTask.
 223     CompileTask::free(task);
 224   }
 225 }
 226 
 227 
 228 CompileTask*  CompileTask::_task_free_list = NULL;
 229 #ifdef ASSERT
 230 int CompileTask::_num_allocated_tasks = 0;
 231 #endif
 232 /**
 233  * Allocate a CompileTask, from the free list if possible.
 234  */
 235 CompileTask* CompileTask::allocate() {
 236   MutexLocker locker(CompileTaskAlloc_lock);
 237   CompileTask* task = NULL;
 238 
 239   if (_task_free_list != NULL) {
 240     task = _task_free_list;
 241     _task_free_list = task->next();
 242     task->set_next(NULL);
 243   } else {
 244     task = new CompileTask();
 245     DEBUG_ONLY(_num_allocated_tasks++;)
 246     assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
 247     task->set_next(NULL);
 248     task->set_is_free(true);
 249   }
 250   assert(task->is_free(), "Task must be free.");
 251   task->set_is_free(false);
 252   return task;
 253 }
 254 
 255 
 256 /**
 257  * Add a task to the free list.
 258  */
 259 void CompileTask::free(CompileTask* task) {
 260   MutexLocker locker(CompileTaskAlloc_lock);
 261   if (!task->is_free()) {
 262     task->set_code(NULL);
 263     assert(!task->lock()->is_locked(), "Should not be locked when freed");
 264     JNIHandles::destroy_global(task->_method_holder);
 265     JNIHandles::destroy_global(task->_hot_method_holder);
 266 
 267     task->set_is_free(true);
 268     task->set_next(_task_free_list);
 269     _task_free_list = task;
 270   }
 271 }
 272 
 273 void CompileTask::initialize(int compile_id,
 274                              methodHandle method,
 275                              int osr_bci,
 276                              int comp_level,
 277                              methodHandle hot_method,
 278                              int hot_count,
 279                              const char* comment,
 280                              bool is_blocking) {
 281   assert(!_lock->is_locked(), "bad locking");
 282 
 283   _compile_id = compile_id;
 284   _method = method();
 285   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
 286   _osr_bci = osr_bci;
 287   _is_blocking = is_blocking;
 288   _comp_level = comp_level;
 289   _num_inlined_bytecodes = 0;
 290 
 291   _is_complete = false;
 292   _is_success = false;
 293   _code_handle = NULL;
 294 
 295   _hot_method = NULL;
 296   _hot_method_holder = NULL;
 297   _hot_count = hot_count;
 298   _time_queued = 0;  // tidy
 299   _comment = comment;
 300   _failure_reason = NULL;
 301 
 302   if (LogCompilation) {
 303     _time_queued = os::elapsed_counter();
 304     if (hot_method.not_null()) {
 305       if (hot_method == method) {
 306         _hot_method = _method;
 307       } else {
 308         _hot_method = hot_method();
 309         // only add loader or mirror if different from _method_holder
 310         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
 311       }
 312     }
 313   }
 314 
 315   _next = NULL;
 316 }
 317 
 318 // ------------------------------------------------------------------
 319 // CompileTask::code/set_code
 320 nmethod* CompileTask::code() const {
 321   if (_code_handle == NULL)  return NULL;
 322   return _code_handle->code();
 323 }
 324 void CompileTask::set_code(nmethod* nm) {
 325   if (_code_handle == NULL && nm == NULL)  return;
 326   guarantee(_code_handle != NULL, "");
 327   _code_handle->set_code(nm);
 328   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 329 }
 330 
 331 void CompileTask::mark_on_stack() {
 332   // Mark these methods as something redefine classes cannot remove.
 333   _method->set_on_stack(true);
 334   if (_hot_method != NULL) {
 335     _hot_method->set_on_stack(true);
 336   }
 337 }
 338 
 339 // ------------------------------------------------------------------
 340 // CompileTask::print_line_on_error
 341 //
 342 // This function is called by fatal error handler when the thread
 343 // causing troubles is a compiler thread.
 344 //
 345 // Do not grab any lock, do not allocate memory.
 346 //
 347 // Otherwise it's the same as CompileTask::print_line()
 348 //
 349 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
 350   // print compiler name
 351   st->print("%s:", CompileBroker::compiler_name(comp_level()));
 352   print_compilation(st);
 353 }
 354 
 355 // ------------------------------------------------------------------
 356 // CompileTask::print_line
 357 void CompileTask::print_tty() {
 358   ttyLocker ttyl;  // keep the following output all in one block
 359   // print compiler name if requested
 360   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
 361     print_compilation(tty);
 362 }
 363 
 364 // ------------------------------------------------------------------
 365 // CompileTask::print_compilation_impl
 366 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
 367                                          bool is_osr_method, int osr_bci, bool is_blocking,
 368                                          const char* msg, bool short_form, bool cr) {
 369   if (!short_form) {
 370     st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp
 371   }
 372   st->print("%4d ", compile_id);    // print compilation number
 373 
 374   // For unloaded methods the transition to zombie occurs after the
 375   // method is cleared so it's impossible to report accurate
 376   // information for that case.
 377   bool is_synchronized = false;
 378   bool has_exception_handler = false;
 379   bool is_native = false;
 380   if (method != NULL) {
 381     is_synchronized       = method->is_synchronized();
 382     has_exception_handler = method->has_exception_handler();
 383     is_native             = method->is_native();
 384   }
 385   // method attributes
 386   const char compile_type   = is_osr_method                   ? '%' : ' ';
 387   const char sync_char      = is_synchronized                 ? 's' : ' ';
 388   const char exception_char = has_exception_handler           ? '!' : ' ';
 389   const char blocking_char  = is_blocking                     ? 'b' : ' ';
 390   const char native_char    = is_native                       ? 'n' : ' ';
 391 
 392   // print method attributes
 393   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
 394 
 395   if (TieredCompilation) {
 396     if (comp_level != -1)  st->print("%d ", comp_level);
 397     else                   st->print("- ");
 398   }
 399   st->print("     ");  // more indent
 400 
 401   if (method == NULL) {
 402     st->print("(method)");
 403   } else {
 404     method->print_short_name(st);
 405     if (is_osr_method) {
 406       st->print(" @ %d", osr_bci);
 407     }
 408     if (method->is_native())
 409       st->print(" (native)");
 410     else
 411       st->print(" (%d bytes)", method->code_size());
 412   }
 413 
 414   if (msg != NULL) {
 415     st->print("   %s", msg);
 416   }
 417   if (cr) {
 418     st->cr();
 419   }
 420 }
 421 
 422 // ------------------------------------------------------------------
 423 // CompileTask::print_inlining
 424 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
 425   //         1234567
 426   st->print("        ");     // print timestamp
 427   //         1234
 428   st->print("     ");        // print compilation number
 429 
 430   // method attributes
 431   if (method->is_loaded()) {
 432     const char sync_char      = method->is_synchronized()        ? 's' : ' ';
 433     const char exception_char = method->has_exception_handlers() ? '!' : ' ';
 434     const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';
 435 
 436     // print method attributes
 437     st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);
 438   } else {
 439     //         %s!bn
 440     st->print("      ");     // print method attributes
 441   }
 442 
 443   if (TieredCompilation) {
 444     st->print("  ");
 445   }
 446   st->print("     ");        // more indent
 447   st->print("    ");         // initial inlining indent
 448 
 449   for (int i = 0; i < inline_level; i++)  st->print("  ");
 450 
 451   st->print("@ %d  ", bci);  // print bci
 452   method->print_short_name(st);
 453   if (method->is_loaded())
 454     st->print(" (%d bytes)", method->code_size());
 455   else
 456     st->print(" (not loaded)");
 457 
 458   if (msg != NULL) {
 459     st->print("   %s", msg);
 460   }
 461   st->cr();
 462 }
 463 
 464 // ------------------------------------------------------------------
 465 // CompileTask::print_inline_indent
 466 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
 467   //         1234567
 468   st->print("        ");     // print timestamp
 469   //         1234
 470   st->print("     ");        // print compilation number
 471   //         %s!bn
 472   st->print("      ");       // print method attributes
 473   if (TieredCompilation) {
 474     st->print("  ");
 475   }
 476   st->print("     ");        // more indent
 477   st->print("    ");         // initial inlining indent
 478   for (int i = 0; i < inline_level; i++)  st->print("  ");
 479 }
 480 
 481 // ------------------------------------------------------------------
 482 // CompileTask::print_compilation
 483 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
 484   bool is_osr_method = osr_bci() != InvocationEntryBci;
 485   print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
 486 }
 487 
 488 // ------------------------------------------------------------------
 489 // CompileTask::log_task
 490 void CompileTask::log_task(xmlStream* log) {
 491   Thread* thread = Thread::current();
 492   methodHandle method(thread, this->method());
 493   ResourceMark rm(thread);
 494 
 495   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
 496   log->print(" compile_id='%d'", _compile_id);
 497   if (_osr_bci != CompileBroker::standard_entry_bci) {
 498     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind
 499   } // else compile_kind='c2c'
 500   if (!method.is_null())  log->method(method);
 501   if (_osr_bci != CompileBroker::standard_entry_bci) {
 502     log->print(" osr_bci='%d'", _osr_bci);
 503   }
 504   if (_comp_level != CompLevel_highest_tier) {
 505     log->print(" level='%d'", _comp_level);
 506   }
 507   if (_is_blocking) {
 508     log->print(" blocking='1'");
 509   }
 510   log->stamp();
 511 }
 512 
 513 
 514 // ------------------------------------------------------------------
 515 // CompileTask::log_task_queued
 516 void CompileTask::log_task_queued() {
 517   Thread* thread = Thread::current();
 518   ttyLocker ttyl;
 519   ResourceMark rm(thread);
 520 
 521   xtty->begin_elem("task_queued");
 522   log_task(xtty);
 523   if (_comment != NULL) {
 524     xtty->print(" comment='%s'", _comment);
 525   }
 526   if (_hot_method != NULL) {
 527     methodHandle hot(thread, _hot_method);
 528     methodHandle method(thread, _method);
 529     if (hot() != method()) {
 530       xtty->method(hot);
 531     }
 532   }
 533   if (_hot_count != 0) {
 534     xtty->print(" hot_count='%d'", _hot_count);
 535   }
 536   xtty->end_elem();
 537 }
 538 
 539 
 540 // ------------------------------------------------------------------
 541 // CompileTask::log_task_start
 542 void CompileTask::log_task_start(CompileLog* log)   {
 543   log->begin_head("task");
 544   log_task(log);
 545   log->end_head();
 546 }
 547 
 548 
 549 // ------------------------------------------------------------------
 550 // CompileTask::log_task_done
 551 void CompileTask::log_task_done(CompileLog* log) {
 552   Thread* thread = Thread::current();
 553   methodHandle method(thread, this->method());
 554   ResourceMark rm(thread);
 555 
 556   if (!_is_success) {
 557     const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
 558     log->elem("failure reason='%s'", reason);
 559   }
 560 
 561   // <task_done ... stamp='1.234'>  </task>
 562   nmethod* nm = code();
 563   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
 564                   _is_success, nm == NULL ? 0 : nm->content_size(),
 565                   method->invocation_count());
 566   int bec = method->backedge_count();
 567   if (bec != 0)  log->print(" backedge_count='%d'", bec);
 568   // Note:  "_is_complete" is about to be set, but is not.
 569   if (_num_inlined_bytecodes != 0) {
 570     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
 571   }
 572   log->stamp();
 573   log->end_elem();
 574   log->tail("task");
 575   log->clear_identities();   // next task will have different CI
 576   if (log->unflushed_count() > 2000) {
 577     log->flush();
 578   }
 579   log->mark_file_end();
 580 }
 581 
 582 
 583 
 584 /**
 585  * Add a CompileTask to a CompileQueue.
 586  */
 587 void CompileQueue::add(CompileTask* task) {
 588   assert(lock()->owned_by_self(), "must own lock");
 589 
 590   task->set_next(NULL);
 591   task->set_prev(NULL);
 592 
 593   if (_last == NULL) {
 594     // The compile queue is empty.
 595     assert(_first == NULL, "queue is empty");
 596     _first = task;
 597     _last = task;
 598   } else {
 599     // Append the task to the queue.
 600     assert(_last->next() == NULL, "not last");
 601     _last->set_next(task);
 602     task->set_prev(_last);
 603     _last = task;
 604   }
 605   ++_size;
 606 
 607   // Mark the method as being in the compile queue.
 608   task->method()->set_queued_for_compilation();
 609 
 610   if (CIPrintCompileQueue) {
 611     print_tty();
 612   }
 613 
 614   if (LogCompilation && xtty != NULL) {
 615     task->log_task_queued();
 616   }
 617 
 618   // Notify CompilerThreads that a task is available.
 619   lock()->notify_all();
 620 }
 621 
 622 /**
 623  * Empties compilation queue by putting all compilation tasks onto
 624  * a freelist. Furthermore, the method wakes up all threads that are
 625  * waiting on a compilation task to finish. This can happen if background
 626  * compilation is disabled.
 627  */
 628 void CompileQueue::free_all() {
 629   MutexLocker mu(lock());
 630   CompileTask* next = _first;
 631 
 632   // Iterate over all tasks in the compile queue
 633   while (next != NULL) {
 634     CompileTask* current = next;
 635     next = current->next();
 636     {
 637       // Wake up thread that blocks on the compile task.
 638       MutexLocker ct_lock(current->lock());
 639       current->lock()->notify();
 640     }
 641     // Put the task back on the freelist.
 642     CompileTask::free(current);
 643   }
 644   _first = NULL;
 645 
 646   // Wake up all threads that block on the queue.
 647   lock()->notify_all();
 648 }
 649 
 650 // ------------------------------------------------------------------
 651 // CompileQueue::get
 652 //
 653 // Get the next CompileTask from a CompileQueue
 654 CompileTask* CompileQueue::get() {
 655   NMethodSweeper::possibly_sweep();
 656 
 657   MutexLocker locker(lock());
 658   // If _first is NULL we have no more compile jobs. There are two reasons for
 659   // having no compile jobs: First, we compiled everything we wanted. Second,
 660   // we ran out of code cache so compilation has been disabled. In the latter
 661   // case we perform code cache sweeps to free memory such that we can re-enable
 662   // compilation.
 663   while (_first == NULL) {
 664     // Exit loop if compilation is disabled forever
 665     if (CompileBroker::is_compilation_disabled_forever()) {
 666       return NULL;
 667     }
 668 
 669     if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
 670       // Wait a certain amount of time to possibly do another sweep.
 671       // We must wait until stack scanning has happened so that we can
 672       // transition a method's state from 'not_entrant' to 'zombie'.
 673       long wait_time = NmethodSweepCheckInterval * 1000;
 674       if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
 675         // Only one thread at a time can do sweeping. Scale the
 676         // wait time according to the number of compiler threads.
 677         // As a result, the next sweep is likely to happen every 100ms
 678         // with an arbitrary number of threads that do sweeping.
 679         wait_time = 100 * CICompilerCount;
 680       }
 681       bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
 682       if (timeout) {
 683         MutexUnlocker ul(lock());
 684         NMethodSweeper::possibly_sweep();
 685       }
 686     } else {
 687       // If there are no compilation tasks and we can compile new jobs
 688       // (i.e., there is enough free space in the code cache) there is
 689       // no need to invoke the sweeper. As a result, the hotness of methods
 690       // remains unchanged. This behavior is desired, since we want to keep
 691       // the stable state, i.e., we do not want to evict methods from the
 692       // code cache if it is unnecessary.
 693       // We need a timed wait here, since compiler threads can exit if compilation
 694       // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 695       // is not critical and we do not want idle compiler threads to wake up too often.
 696       lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 697     }
 698   }
 699 
 700   if (CompileBroker::is_compilation_disabled_forever()) {
 701     return NULL;
 702   }
 703 
 704   CompileTask* task;
 705   {
 706     No_Safepoint_Verifier nsv;
 707     task = CompilationPolicy::policy()->select_task(this);
 708   }
 709   remove(task);
 710   purge_stale_tasks(); // may temporarily release MCQ lock
 711   return task;
 712 }
 713 
 714 // Clean & deallocate stale compile tasks.
 715 // Temporarily releases MethodCompileQueue lock.
 716 void CompileQueue::purge_stale_tasks() {
 717   assert(lock()->owned_by_self(), "must own lock");
 718   if (_first_stale != NULL) {
 719     // Stale tasks are purged when MCQ lock is released,
 720     // but _first_stale updates are protected by MCQ lock.
 721     // Once task processing starts and MCQ lock is released,
 722     // other compiler threads can reuse _first_stale.
 723     CompileTask* head = _first_stale;
 724     _first_stale = NULL;
 725     {
 726       MutexUnlocker ul(lock());
 727       for (CompileTask* task = head; task != NULL; ) {
 728         CompileTask* next_task = task->next();
 729         CompileTaskWrapper ctw(task); // Frees the task
 730         task->set_failure_reason("stale task");
 731         task = next_task;
 732       }
 733     }
 734   }
 735 }
 736 
 737 void CompileQueue::remove(CompileTask* task) {
 738    assert(lock()->owned_by_self(), "must own lock");
 739   if (task->prev() != NULL) {
 740     task->prev()->set_next(task->next());
 741   } else {
 742     // max is the first element
 743     assert(task == _first, "Sanity");
 744     _first = task->next();
 745   }
 746 
 747   if (task->next() != NULL) {
 748     task->next()->set_prev(task->prev());
 749   } else {
 750     // max is the last element
 751     assert(task == _last, "Sanity");
 752     _last = task->prev();
 753   }
 754   --_size;
 755 }
 756 
 757 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 758   assert(lock()->owned_by_self(), "must own lock");
 759   remove(task);
 760 
 761   // Enqueue the task for reclamation (should be done outside MCQ lock)
 762   task->set_next(_first_stale);
 763   task->set_prev(NULL);
 764   _first_stale = task;
 765 }
 766 
 767 // methods in the compile queue need to be marked as used on the stack
 768 // so that they don't get reclaimed by Redefine Classes
 769 void CompileQueue::mark_on_stack() {
 770   CompileTask* task = _first;
 771   while (task != NULL) {
 772     task->mark_on_stack();
 773     task = task->next();
 774   }
 775 }
 776 
 777 
 778 CompileQueue* CompileBroker::compile_queue(int comp_level) {
 779   if (is_c2_compile(comp_level)) return _c2_compile_queue;
 780   if (is_c1_compile(comp_level)) return _c1_compile_queue;
 781   return NULL;
 782 }
 783 
 784 
 785 void CompileBroker::print_compile_queues(outputStream* st) {
 786   _c1_compile_queue->print(st);
 787   _c2_compile_queue->print(st);
 788 }
 789 
 790 
 791 void CompileQueue::print(outputStream* st) {
 792   st->print_cr("Contents of %s", name());
 793   st->print_cr("----------------------------");
 794   CompileTask* task = _first;
 795   if (task == NULL) {
 796     st->print_cr("Empty");;
 797   } else {
 798     while (task != NULL) {
 799       task->print_compilation(st, NULL, true, true);
 800       task = task->next();
 801     }
 802   }
 803   st->print_cr("----------------------------");
 804 }
 805 
 806 void CompileQueue::print_tty() {
 807   ttyLocker ttyl;
 808   print(tty);
 809 }
 810 
 811 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 812 
 813   _current_method[0] = '\0';
 814   _compile_type = CompileBroker::no_compile;
 815 
 816   if (UsePerfData) {
 817     ResourceMark rm;
 818 
 819     // create the thread instance name space string - don't create an
 820     // instance subspace if instance is -1 - keeps the adapterThread
 821     // counters  from having a ".0" namespace.
 822     const char* thread_i = (instance == -1) ? thread_name :
 823                       PerfDataManager::name_space(thread_name, instance);
 824 
 825 
 826     char* name = PerfDataManager::counter_name(thread_i, "method");
 827     _perf_current_method =
 828                PerfDataManager::create_string_variable(SUN_CI, name,
 829                                                        cmname_buffer_length,
 830                                                        _current_method, CHECK);
 831 
 832     name = PerfDataManager::counter_name(thread_i, "type");
 833     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 834                                                           PerfData::U_None,
 835                                                          (jlong)_compile_type,
 836                                                           CHECK);
 837 
 838     name = PerfDataManager::counter_name(thread_i, "time");
 839     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 840                                                  PerfData::U_Ticks, CHECK);
 841 
 842     name = PerfDataManager::counter_name(thread_i, "compiles");
 843     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 844                                                      PerfData::U_Events, CHECK);
 845   }
 846 }
 847 
 848 // ------------------------------------------------------------------
 849 // CompileBroker::compilation_init
 850 //
 851 // Initialize the Compilation object
 852 void CompileBroker::compilation_init() {
 853   _last_method_compiled[0] = '\0';
 854 
 855   // No need to initialize compilation system if we do not use it.
 856   if (!UseCompiler) {
 857     return;
 858   }
 859 #ifndef SHARK
 860   // Set the interface to the current compiler(s).
 861   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 862   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 863 #ifdef COMPILER1
 864   if (c1_count > 0) {
 865     _compilers[0] = new Compiler();
 866   }
 867 #endif // COMPILER1
 868 
 869 #ifdef COMPILER2
 870   if (c2_count > 0) {
 871     _compilers[1] = new C2Compiler();
 872   }
 873 #endif // COMPILER2
 874 
 875 #else // SHARK
 876   int c1_count = 0;
 877   int c2_count = 1;
 878 
 879   _compilers[1] = new SharkCompiler();
 880 #endif // SHARK
 881 
 882   // Start the CompilerThreads
 883   init_compiler_threads(c1_count, c2_count);
 884   // totalTime performance counter is always created as it is required
 885   // by the implementation of java.lang.management.CompilationMBean.
 886   {
 887     EXCEPTION_MARK;
 888     _perf_total_compilation =
 889                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 890                                                  PerfData::U_Ticks, CHECK);
 891   }
 892 
 893 
 894   if (UsePerfData) {
 895 
 896     EXCEPTION_MARK;
 897 
 898     // create the jvmstat performance counters
 899     _perf_osr_compilation =
 900                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 901                                                  PerfData::U_Ticks, CHECK);
 902 
 903     _perf_standard_compilation =
 904                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 905                                                  PerfData::U_Ticks, CHECK);
 906 
 907     _perf_total_bailout_count =
 908                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 909                                                  PerfData::U_Events, CHECK);
 910 
 911     _perf_total_invalidated_count =
 912                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 913                                                  PerfData::U_Events, CHECK);
 914 
 915     _perf_total_compile_count =
 916                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 917                                                  PerfData::U_Events, CHECK);
 918     _perf_total_osr_compile_count =
 919                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 920                                                  PerfData::U_Events, CHECK);
 921 
 922     _perf_total_standard_compile_count =
 923                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 924                                                  PerfData::U_Events, CHECK);
 925 
 926     _perf_sum_osr_bytes_compiled =
 927                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 928                                                  PerfData::U_Bytes, CHECK);
 929 
 930     _perf_sum_standard_bytes_compiled =
 931                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 932                                                  PerfData::U_Bytes, CHECK);
 933 
 934     _perf_sum_nmethod_size =
 935                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 936                                                  PerfData::U_Bytes, CHECK);
 937 
 938     _perf_sum_nmethod_code_size =
 939                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 940                                                  PerfData::U_Bytes, CHECK);
 941 
 942     _perf_last_method =
 943                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 944                                        CompilerCounters::cmname_buffer_length,
 945                                        "", CHECK);
 946 
 947     _perf_last_failed_method =
 948             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 949                                        CompilerCounters::cmname_buffer_length,
 950                                        "", CHECK);
 951 
 952     _perf_last_invalidated_method =
 953         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 954                                      CompilerCounters::cmname_buffer_length,
 955                                      "", CHECK);
 956 
 957     _perf_last_compile_type =
 958              PerfDataManager::create_variable(SUN_CI, "lastType",
 959                                               PerfData::U_None,
 960                                               (jlong)CompileBroker::no_compile,
 961                                               CHECK);
 962 
 963     _perf_last_compile_size =
 964              PerfDataManager::create_variable(SUN_CI, "lastSize",
 965                                               PerfData::U_Bytes,
 966                                               (jlong)CompileBroker::no_compile,
 967                                               CHECK);
 968 
 969 
 970     _perf_last_failed_type =
 971              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 972                                               PerfData::U_None,
 973                                               (jlong)CompileBroker::no_compile,
 974                                               CHECK);
 975 
 976     _perf_last_invalidated_type =
 977          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 978                                           PerfData::U_None,
 979                                           (jlong)CompileBroker::no_compile,
 980                                           CHECK);
 981   }
 982 
 983   _initialized = true;
 984 }
 985 
 986 
 987 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
 988                                                     AbstractCompiler* comp, TRAPS) {
 989   CompilerThread* compiler_thread = NULL;
 990 
 991   Klass* k =
 992     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
 993                                       true, CHECK_0);
 994   instanceKlassHandle klass (THREAD, k);
 995   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 996   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 997 
 998   // Initialize thread_oop to put it into the system threadGroup
 999   Handle thread_group (THREAD,  Universe::system_thread_group());
1000   JavaValue result(T_VOID);
1001   JavaCalls::call_special(&result, thread_oop,
1002                        klass,
1003                        vmSymbols::object_initializer_name(),
1004                        vmSymbols::threadgroup_string_void_signature(),
1005                        thread_group,
1006                        string,
1007                        CHECK_0);
1008 
1009   {
1010     MutexLocker mu(Threads_lock, THREAD);
1011     compiler_thread = new CompilerThread(queue, counters);
1012     // At this point the new CompilerThread data-races with this startup
1013     // thread (which I believe is the primoridal thread and NOT the VM
1014     // thread).  This means Java bytecodes being executed at startup can
1015     // queue compile jobs which will run at whatever default priority the
1016     // newly created CompilerThread runs at.
1017 
1018 
1019     // At this point it may be possible that no osthread was created for the
1020     // JavaThread due to lack of memory. We would have to throw an exception
1021     // in that case. However, since this must work and we do not allow
1022     // exceptions anyway, check and abort if this fails.
1023 
1024     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1025       vm_exit_during_initialization("java.lang.OutOfMemoryError",
1026                                     os::native_thread_creation_failed_msg());
1027     }
1028 
1029     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1030 
1031     // Note that this only sets the JavaThread _priority field, which by
1032     // definition is limited to Java priorities and not OS priorities.
1033     // The os-priority is set in the CompilerThread startup code itself
1034 
1035     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1036 
1037     // Note that we cannot call os::set_priority because it expects Java
1038     // priorities and we are *explicitly* using OS priorities so that it's
1039     // possible to set the compiler thread priority higher than any Java
1040     // thread.
1041 
1042     int native_prio = CompilerThreadPriority;
1043     if (native_prio == -1) {
1044       if (UseCriticalCompilerThreadPriority) {
1045         native_prio = os::java_to_os_priority[CriticalPriority];
1046       } else {
1047         native_prio = os::java_to_os_priority[NearMaxPriority];
1048       }
1049     }
1050     os::set_native_priority(compiler_thread, native_prio);
1051 
1052     java_lang_Thread::set_daemon(thread_oop());
1053 
1054     compiler_thread->set_threadObj(thread_oop());
1055     compiler_thread->set_compiler(comp);
1056     Threads::add(compiler_thread);
1057     Thread::start(compiler_thread);
1058   }
1059 
1060   // Let go of Threads_lock before yielding
1061   os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1062 
1063   return compiler_thread;
1064 }
1065 
1066 
1067 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1068   EXCEPTION_MARK;
1069 #if !defined(ZERO) && !defined(SHARK)
1070   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1071 #endif // !ZERO && !SHARK
1072   // Initialize the compilation queue
1073   if (c2_compiler_count > 0) {
1074     _c2_compile_queue  = new CompileQueue("C2 compile queue",  MethodCompileQueue_lock);
1075     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1076   }
1077   if (c1_compiler_count > 0) {
1078     _c1_compile_queue  = new CompileQueue("C1 compile queue",  MethodCompileQueue_lock);
1079     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1080   }
1081 
1082   int compiler_count = c1_compiler_count + c2_compiler_count;
1083 
1084   _compiler_threads =
1085     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1086 
1087   char name_buffer[256];
1088   for (int i = 0; i < c2_compiler_count; i++) {
1089     // Create a name for our thread.
1090     sprintf(name_buffer, "C2 CompilerThread%d", i);
1091     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1092     // Shark and C2
1093     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1094     _compiler_threads->append(new_thread);
1095   }
1096 
1097   for (int i = c2_compiler_count; i < compiler_count; i++) {
1098     // Create a name for our thread.
1099     sprintf(name_buffer, "C1 CompilerThread%d", i);
1100     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1101     // C1
1102     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1103     _compiler_threads->append(new_thread);
1104   }
1105 
1106   if (UsePerfData) {
1107     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1108   }
1109 }
1110 
1111 
1112 /**
1113  * Set the methods on the stack as on_stack so that redefine classes doesn't
1114  * reclaim them. This method is executed at a safepoint.
1115  */
1116 void CompileBroker::mark_on_stack() {
1117   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1118   // Since we are at a safepoint, we do not need a lock to access
1119   // the compile queues.
1120   if (_c2_compile_queue != NULL) {
1121     _c2_compile_queue->mark_on_stack();
1122   }
1123   if (_c1_compile_queue != NULL) {
1124     _c1_compile_queue->mark_on_stack();
1125   }
1126 }
1127 
1128 // ------------------------------------------------------------------
1129 // CompileBroker::compile_method
1130 //
1131 // Request compilation of a method.
1132 void CompileBroker::compile_method_base(methodHandle method,
1133                                         int osr_bci,
1134                                         int comp_level,
1135                                         methodHandle hot_method,
1136                                         int hot_count,
1137                                         const char* comment,
1138                                         Thread* thread) {
1139   // do nothing if compiler thread(s) is not available
1140   if (!_initialized) {
1141     return;
1142   }
1143 
1144   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1145   assert(method->method_holder()->oop_is_instance(),
1146          "sanity check");
1147   assert(!method->method_holder()->is_not_initialized(),
1148          "method holder must be initialized");
1149   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1150 
1151   if (CIPrintRequests) {
1152     tty->print("request: ");
1153     method->print_short_name(tty);
1154     if (osr_bci != InvocationEntryBci) {
1155       tty->print(" osr_bci: %d", osr_bci);
1156     }
1157     tty->print(" comment: %s count: %d", comment, hot_count);
1158     if (!hot_method.is_null()) {
1159       tty->print(" hot: ");
1160       if (hot_method() != method()) {
1161           hot_method->print_short_name(tty);
1162       } else {
1163         tty->print("yes");
1164       }
1165     }
1166     tty->cr();
1167   }
1168 
1169   // A request has been made for compilation.  Before we do any
1170   // real work, check to see if the method has been compiled
1171   // in the meantime with a definitive result.
1172   if (compilation_is_complete(method, osr_bci, comp_level)) {
1173     return;
1174   }
1175 
1176 #ifndef PRODUCT
1177   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1178     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1179       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1180       return;
1181     }
1182   }
1183 #endif
1184 
1185   // If this method is already in the compile queue, then
1186   // we do not block the current thread.
1187   if (compilation_is_in_queue(method)) {
1188     // We may want to decay our counter a bit here to prevent
1189     // multiple denied requests for compilation.  This is an
1190     // open compilation policy issue. Note: The other possibility,
1191     // in the case that this is a blocking compile request, is to have
1192     // all subsequent blocking requesters wait for completion of
1193     // ongoing compiles. Note that in this case we'll need a protocol
1194     // for freeing the associated compile tasks. [Or we could have
1195     // a single static monitor on which all these waiters sleep.]
1196     return;
1197   }
1198 
1199   // If the requesting thread is holding the pending list lock
1200   // then we just return. We can't risk blocking while holding
1201   // the pending list lock or a 3-way deadlock may occur
1202   // between the reference handler thread, a GC (instigated
1203   // by a compiler thread), and compiled method registration.
1204   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1205     return;
1206   }
1207 
1208   // Outputs from the following MutexLocker block:
1209   CompileTask* task     = NULL;
1210   bool         blocking = false;
1211   CompileQueue* queue  = compile_queue(comp_level);
1212 
1213   // Acquire our lock.
1214   {
1215     MutexLocker locker(queue->lock(), thread);
1216 
1217     // Make sure the method has not slipped into the queues since
1218     // last we checked; note that those checks were "fast bail-outs".
1219     // Here we need to be more careful, see 14012000 below.
1220     if (compilation_is_in_queue(method)) {
1221       return;
1222     }
1223 
1224     // We need to check again to see if the compilation has
1225     // completed.  A previous compilation may have registered
1226     // some result.
1227     if (compilation_is_complete(method, osr_bci, comp_level)) {
1228       return;
1229     }
1230 
1231     // We now know that this compilation is not pending, complete,
1232     // or prohibited.  Assign a compile_id to this compilation
1233     // and check to see if it is in our [Start..Stop) range.
1234     int compile_id = assign_compile_id(method, osr_bci);
1235     if (compile_id == 0) {
1236       // The compilation falls outside the allowed range.
1237       return;
1238     }
1239 
1240     // Should this thread wait for completion of the compile?
1241     blocking = is_compile_blocking();
1242 
1243     // We will enter the compilation in the queue.
1244     // 14012000: Note that this sets the queued_for_compile bits in
1245     // the target method. We can now reason that a method cannot be
1246     // queued for compilation more than once, as follows:
1247     // Before a thread queues a task for compilation, it first acquires
1248     // the compile queue lock, then checks if the method's queued bits
1249     // are set or it has already been compiled. Thus there can not be two
1250     // instances of a compilation task for the same method on the
1251     // compilation queue. Consider now the case where the compilation
1252     // thread has already removed a task for that method from the queue
1253     // and is in the midst of compiling it. In this case, the
1254     // queued_for_compile bits must be set in the method (and these
1255     // will be visible to the current thread, since the bits were set
1256     // under protection of the compile queue lock, which we hold now.
1257     // When the compilation completes, the compiler thread first sets
1258     // the compilation result and then clears the queued_for_compile
1259     // bits. Neither of these actions are protected by a barrier (or done
1260     // under the protection of a lock), so the only guarantee we have
1261     // (on machines with TSO (Total Store Order)) is that these values
1262     // will update in that order. As a result, the only combinations of
1263     // these bits that the current thread will see are, in temporal order:
1264     // <RESULT, QUEUE> :
1265     //     <0, 1> : in compile queue, but not yet compiled
1266     //     <1, 1> : compiled but queue bit not cleared
1267     //     <1, 0> : compiled and queue bit cleared
1268     // Because we first check the queue bits then check the result bits,
1269     // we are assured that we cannot introduce a duplicate task.
1270     // Note that if we did the tests in the reverse order (i.e. check
1271     // result then check queued bit), we could get the result bit before
1272     // the compilation completed, and the queue bit after the compilation
1273     // completed, and end up introducing a "duplicate" (redundant) task.
1274     // In that case, the compiler thread should first check if a method
1275     // has already been compiled before trying to compile it.
1276     // NOTE: in the event that there are multiple compiler threads and
1277     // there is de-optimization/recompilation, things will get hairy,
1278     // and in that case it's best to protect both the testing (here) of
1279     // these bits, and their updating (here and elsewhere) under a
1280     // common lock.
1281     task = create_compile_task(queue,
1282                                compile_id, method,
1283                                osr_bci, comp_level,
1284                                hot_method, hot_count, comment,
1285                                blocking);
1286   }
1287 
1288   if (blocking) {
1289     wait_for_completion(task);
1290   }
1291 }
1292 
1293 
1294 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1295                                        int comp_level,
1296                                        methodHandle hot_method, int hot_count,
1297                                        const char* comment, Thread* THREAD) {
1298   // make sure arguments make sense
1299   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1300   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1301   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1302   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1303   // allow any levels for WhiteBox
1304   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1305   // return quickly if possible
1306 
1307   // lock, make sure that the compilation
1308   // isn't prohibited in a straightforward way.
1309   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1310   if (comp == NULL || !comp->can_compile_method(method) ||
1311       compilation_is_prohibited(method, osr_bci, comp_level)) {
1312     return NULL;
1313   }
1314 
1315   if (osr_bci == InvocationEntryBci) {
1316     // standard compilation
1317     nmethod* method_code = method->code();
1318     if (method_code != NULL) {
1319       if (compilation_is_complete(method, osr_bci, comp_level)) {
1320         return method_code;
1321       }
1322     }
1323     if (method->is_not_compilable(comp_level)) {
1324       return NULL;
1325     }
1326   } else {
1327     // osr compilation
1328 #ifndef TIERED
1329     // seems like an assert of dubious value
1330     assert(comp_level == CompLevel_highest_tier,
1331            "all OSR compiles are assumed to be at a single compilation lavel");
1332 #endif // TIERED
1333     // We accept a higher level osr method
1334     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1335     if (nm != NULL) return nm;
1336     if (method->is_not_osr_compilable(comp_level)) return NULL;
1337   }
1338 
1339   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1340   // some prerequisites that are compiler specific
1341   if (comp->is_c2() || comp->is_shark()) {
1342     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1343     // Resolve all classes seen in the signature of the method
1344     // we are compiling.
1345     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1346   }
1347 
1348   // If the method is native, do the lookup in the thread requesting
1349   // the compilation. Native lookups can load code, which is not
1350   // permitted during compilation.
1351   //
1352   // Note: A native method implies non-osr compilation which is
1353   //       checked with an assertion at the entry of this method.
1354   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1355     bool in_base_library;
1356     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1357     if (HAS_PENDING_EXCEPTION) {
1358       // In case of an exception looking up the method, we just forget
1359       // about it. The interpreter will kick-in and throw the exception.
1360       method->set_not_compilable(); // implies is_not_osr_compilable()
1361       CLEAR_PENDING_EXCEPTION;
1362       return NULL;
1363     }
1364     assert(method->has_native_function(), "must have native code by now");
1365   }
1366 
1367   // RedefineClasses() has replaced this method; just return
1368   if (method->is_old()) {
1369     return NULL;
1370   }
1371 
1372   // JVMTI -- post_compile_event requires jmethod_id() that may require
1373   // a lock the compiling thread can not acquire. Prefetch it here.
1374   if (JvmtiExport::should_post_compiled_method_load()) {
1375     method->jmethod_id();
1376   }
1377 
1378   // do the compilation
1379   if (method->is_native()) {
1380     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1381       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1382       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1383       //
1384       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1385       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1386       AdapterHandlerLibrary::create_native_wrapper(method);
1387     } else {
1388       return NULL;
1389     }
1390   } else {
1391     // If the compiler is shut off due to code cache getting full
1392     // fail out now so blocking compiles dont hang the java thread
1393     if (!should_compile_new_jobs()) {
1394       CompilationPolicy::policy()->delay_compilation(method());
1395       return NULL;
1396     }
1397     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1398   }
1399 
1400   // return requested nmethod
1401   // We accept a higher level osr method
1402   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1403 }
1404 
1405 
1406 // ------------------------------------------------------------------
1407 // CompileBroker::compilation_is_complete
1408 //
1409 // See if compilation of this method is already complete.
1410 bool CompileBroker::compilation_is_complete(methodHandle method,
1411                                             int          osr_bci,
1412                                             int          comp_level) {
1413   bool is_osr = (osr_bci != standard_entry_bci);
1414   if (is_osr) {
1415     if (method->is_not_osr_compilable(comp_level)) {
1416       return true;
1417     } else {
1418       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1419       return (result != NULL);
1420     }
1421   } else {
1422     if (method->is_not_compilable(comp_level)) {
1423       return true;
1424     } else {
1425       nmethod* result = method->code();
1426       if (result == NULL) return false;
1427       return comp_level == result->comp_level();
1428     }
1429   }
1430 }
1431 
1432 
1433 /**
1434  * See if this compilation is already requested.
1435  *
1436  * Implementation note: there is only a single "is in queue" bit
1437  * for each method.  This means that the check below is overly
1438  * conservative in the sense that an osr compilation in the queue
1439  * will block a normal compilation from entering the queue (and vice
1440  * versa).  This can be remedied by a full queue search to disambiguate
1441  * cases.  If it is deemed profitable, this may be done.
1442  */
1443 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1444   return method->queued_for_compilation();
1445 }
1446 
1447 // ------------------------------------------------------------------
1448 // CompileBroker::compilation_is_prohibited
1449 //
1450 // See if this compilation is not allowed.
1451 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1452   bool is_native = method->is_native();
1453   // Some compilers may not support the compilation of natives.
1454   AbstractCompiler *comp = compiler(comp_level);
1455   if (is_native &&
1456       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1457     method->set_not_compilable_quietly(comp_level);
1458     return true;
1459   }
1460 
1461   bool is_osr = (osr_bci != standard_entry_bci);
1462   // Some compilers may not support on stack replacement.
1463   if (is_osr &&
1464       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1465     method->set_not_osr_compilable(comp_level);
1466     return true;
1467   }
1468 
1469   // The method may be explicitly excluded by the user.
1470   bool quietly;
1471   if (CompilerOracle::should_exclude(method, quietly)) {
1472     if (!quietly) {
1473       // This does not happen quietly...
1474       ResourceMark rm;
1475       tty->print("### Excluding %s:%s",
1476                  method->is_native() ? "generation of native wrapper" : "compile",
1477                  (method->is_static() ? " static" : ""));
1478       method->print_short_name(tty);
1479       tty->cr();
1480     }
1481     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1482   }
1483 
1484   return false;
1485 }
1486 
1487 /**
1488  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1489  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1490  * The function also allows to generate separate compilation IDs for OSR compilations.
1491  */
1492 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1493 #ifdef ASSERT
1494   bool is_osr = (osr_bci != standard_entry_bci);
1495   int id;
1496   if (method->is_native()) {
1497     assert(!is_osr, "can't be osr");
1498     // Adapters, native wrappers and method handle intrinsics
1499     // should be generated always.
1500     return Atomic::add(1, &_compilation_id);
1501   } else if (CICountOSR && is_osr) {
1502     id = Atomic::add(1, &_osr_compilation_id);
1503     if (CIStartOSR <= id && id < CIStopOSR) {
1504       return id;
1505     }
1506   } else {
1507     id = Atomic::add(1, &_compilation_id);
1508     if (CIStart <= id && id < CIStop) {
1509       return id;
1510     }
1511   }
1512 
1513   // Method was not in the appropriate compilation range.
1514   method->set_not_compilable_quietly();
1515   return 0;
1516 #else
1517   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1518   // only _compilation_id is incremented.
1519   return Atomic::add(1, &_compilation_id);
1520 #endif
1521 }
1522 
1523 /**
1524  * Should the current thread block until this compilation request
1525  * has been fulfilled?
1526  */
1527 bool CompileBroker::is_compile_blocking() {
1528   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1529   return !BackgroundCompilation;
1530 }
1531 
1532 
1533 // ------------------------------------------------------------------
1534 // CompileBroker::preload_classes
1535 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1536   // Move this code over from c1_Compiler.cpp
1537   ShouldNotReachHere();
1538 }
1539 
1540 
1541 // ------------------------------------------------------------------
1542 // CompileBroker::create_compile_task
1543 //
1544 // Create a CompileTask object representing the current request for
1545 // compilation.  Add this task to the queue.
1546 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1547                                               int           compile_id,
1548                                               methodHandle  method,
1549                                               int           osr_bci,
1550                                               int           comp_level,
1551                                               methodHandle  hot_method,
1552                                               int           hot_count,
1553                                               const char*   comment,
1554                                               bool          blocking) {
1555   CompileTask* new_task = CompileTask::allocate();
1556   new_task->initialize(compile_id, method, osr_bci, comp_level,
1557                        hot_method, hot_count, comment,
1558                        blocking);
1559   queue->add(new_task);
1560   return new_task;
1561 }
1562 
1563 
1564 /**
1565  *  Wait for the compilation task to complete.
1566  */
1567 void CompileBroker::wait_for_completion(CompileTask* task) {
1568   if (CIPrintCompileQueue) {
1569     ttyLocker ttyl;
1570     tty->print_cr("BLOCKING FOR COMPILE");
1571   }
1572 
1573   assert(task->is_blocking(), "can only wait on blocking task");
1574 
1575   JavaThread* thread = JavaThread::current();
1576   thread->set_blocked_on_compilation(true);
1577 
1578   methodHandle method(thread, task->method());
1579   {
1580     MutexLocker waiter(task->lock(), thread);
1581 
1582     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1583       task->lock()->wait();
1584     }
1585   }
1586 
1587   thread->set_blocked_on_compilation(false);
1588   if (is_compilation_disabled_forever()) {
1589     CompileTask::free(task);
1590     return;
1591   }
1592 
1593   // It is harmless to check this status without the lock, because
1594   // completion is a stable property (until the task object is recycled).
1595   assert(task->is_complete(), "Compilation should have completed");
1596   assert(task->code_handle() == NULL, "must be reset");
1597 
1598   // By convention, the waiter is responsible for recycling a
1599   // blocking CompileTask. Since there is only one waiter ever
1600   // waiting on a CompileTask, we know that no one else will
1601   // be using this CompileTask; we can free it.
1602   CompileTask::free(task);
1603 }
1604 
1605 /**
1606  * Initialize compiler thread(s) + compiler object(s). The postcondition
1607  * of this function is that the compiler runtimes are initialized and that
1608  * compiler threads can start compiling.
1609  */
1610 bool CompileBroker::init_compiler_runtime() {
1611   CompilerThread* thread = CompilerThread::current();
1612   AbstractCompiler* comp = thread->compiler();
1613   // Final sanity check - the compiler object must exist
1614   guarantee(comp != NULL, "Compiler object must exist");
1615 
1616   int system_dictionary_modification_counter;
1617   {
1618     MutexLocker locker(Compile_lock, thread);
1619     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1620   }
1621 
1622   {
1623     // Must switch to native to allocate ci_env
1624     ThreadToNativeFromVM ttn(thread);
1625     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1626     // Cache Jvmti state
1627     ci_env.cache_jvmti_state();
1628     // Cache DTrace flags
1629     ci_env.cache_dtrace_flags();
1630 
1631     // Switch back to VM state to do compiler initialization
1632     ThreadInVMfromNative tv(thread);
1633     ResetNoHandleMark rnhm;
1634 
1635 
1636     if (!comp->is_shark()) {
1637       // Perform per-thread and global initializations
1638       comp->initialize();
1639     }
1640   }
1641 
1642   if (comp->is_failed()) {
1643     disable_compilation_forever();
1644     // If compiler initialization failed, no compiler thread that is specific to a
1645     // particular compiler runtime will ever start to compile methods.
1646     shutdown_compiler_runtime(comp, thread);
1647     return false;
1648   }
1649 
1650   // C1 specific check
1651   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1652     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1653     return false;
1654   }
1655 
1656   return true;
1657 }
1658 
1659 /**
1660  * If C1 and/or C2 initialization failed, we shut down all compilation.
1661  * We do this to keep things simple. This can be changed if it ever turns
1662  * out to be a problem.
1663  */
1664 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1665   // Free buffer blob, if allocated
1666   if (thread->get_buffer_blob() != NULL) {
1667     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1668     CodeCache::free(thread->get_buffer_blob());
1669   }
1670 
1671   if (comp->should_perform_shutdown()) {
1672     // There are two reasons for shutting down the compiler
1673     // 1) compiler runtime initialization failed
1674     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1675     warning("%s initialization failed. Shutting down all compilers", comp->name());
1676 
1677     // Only one thread per compiler runtime object enters here
1678     // Set state to shut down
1679     comp->set_shut_down();
1680 
1681     // Delete all queued compilation tasks to make compiler threads exit faster.
1682     if (_c1_compile_queue != NULL) {
1683       _c1_compile_queue->free_all();
1684     }
1685 
1686     if (_c2_compile_queue != NULL) {
1687       _c2_compile_queue->free_all();
1688     }
1689 
1690     // Set flags so that we continue execution with using interpreter only.
1691     UseCompiler    = false;
1692     UseInterpreter = true;
1693 
1694     // We could delete compiler runtimes also. However, there are references to
1695     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1696     // fail. This can be done later if necessary.
1697   }
1698 }
1699 
1700 // ------------------------------------------------------------------
1701 // CompileBroker::compiler_thread_loop
1702 //
1703 // The main loop run by a CompilerThread.
1704 void CompileBroker::compiler_thread_loop() {
1705   CompilerThread* thread = CompilerThread::current();
1706   CompileQueue* queue = thread->queue();
1707   // For the thread that initializes the ciObjectFactory
1708   // this resource mark holds all the shared objects
1709   ResourceMark rm;
1710 
1711   // First thread to get here will initialize the compiler interface
1712 
1713   if (!ciObjectFactory::is_initialized()) {
1714     ASSERT_IN_VM;
1715     MutexLocker only_one (CompileThread_lock, thread);
1716     if (!ciObjectFactory::is_initialized()) {
1717       ciObjectFactory::initialize();
1718     }
1719   }
1720 
1721   // Open a log.
1722   if (LogCompilation) {
1723     init_compiler_thread_log();
1724   }
1725   CompileLog* log = thread->log();
1726   if (log != NULL) {
1727     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1728                     thread->name(),
1729                     os::current_thread_id(),
1730                     os::current_process_id());
1731     log->stamp();
1732     log->end_elem();
1733   }
1734 
1735   // If compiler thread/runtime initialization fails, exit the compiler thread
1736   if (!init_compiler_runtime()) {
1737     return;
1738   }
1739 
1740   // Poll for new compilation tasks as long as the JVM runs. Compilation
1741   // should only be disabled if something went wrong while initializing the
1742   // compiler runtimes. This, in turn, should not happen. The only known case
1743   // when compiler runtime initialization fails is if there is not enough free
1744   // space in the code cache to generate the necessary stubs, etc.
1745   while (!is_compilation_disabled_forever()) {
1746     // We need this HandleMark to avoid leaking VM handles.
1747     HandleMark hm(thread);
1748 
1749     if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1750       // the code cache is really full
1751       handle_full_code_cache();
1752     }
1753 
1754     CompileTask* task = queue->get();
1755     if (task == NULL) {
1756       continue;
1757     }
1758 
1759     // Give compiler threads an extra quanta.  They tend to be bursty and
1760     // this helps the compiler to finish up the job.
1761     if( CompilerThreadHintNoPreempt )
1762       os::hint_no_preempt();
1763 
1764     // trace per thread time and compile statistics
1765     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1766     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1767 
1768     // Assign the task to the current thread.  Mark this compilation
1769     // thread as active for the profiler.
1770     CompileTaskWrapper ctw(task);
1771     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1772     task->set_code_handle(&result_handle);
1773     methodHandle method(thread, task->method());
1774 
1775     // Never compile a method if breakpoints are present in it
1776     if (method()->number_of_breakpoints() == 0) {
1777       // Compile the method.
1778       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1779 #ifdef COMPILER1
1780         // Allow repeating compilations for the purpose of benchmarking
1781         // compile speed. This is not useful for customers.
1782         if (CompilationRepeat != 0) {
1783           int compile_count = CompilationRepeat;
1784           while (compile_count > 0) {
1785             invoke_compiler_on_method(task);
1786             nmethod* nm = method->code();
1787             if (nm != NULL) {
1788               nm->make_zombie();
1789               method->clear_code();
1790             }
1791             compile_count--;
1792           }
1793         }
1794 #endif /* COMPILER1 */
1795         invoke_compiler_on_method(task);
1796       } else {
1797         // After compilation is disabled, remove remaining methods from queue
1798         method->clear_queued_for_compilation();
1799         task->set_failure_reason("compilation is disabled");
1800       }
1801     }
1802   }
1803 
1804   // Shut down compiler runtime
1805   shutdown_compiler_runtime(thread->compiler(), thread);
1806 }
1807 
1808 // ------------------------------------------------------------------
1809 // CompileBroker::init_compiler_thread_log
1810 //
1811 // Set up state required by +LogCompilation.
1812 void CompileBroker::init_compiler_thread_log() {
1813     CompilerThread* thread = CompilerThread::current();
1814     char  file_name[4*K];
1815     FILE* fp = NULL;
1816     intx thread_id = os::current_thread_id();
1817     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1818       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1819       if (dir == NULL) {
1820         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1821                      thread_id, os::current_process_id());
1822       } else {
1823         jio_snprintf(file_name, sizeof(file_name),
1824                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1825                      os::file_separator(), thread_id, os::current_process_id());
1826       }
1827 
1828       fp = fopen(file_name, "at");
1829       if (fp != NULL) {
1830         if (LogCompilation && Verbose) {
1831           tty->print_cr("Opening compilation log %s", file_name);
1832         }
1833         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1834         thread->init_log(log);
1835 
1836         if (xtty != NULL) {
1837           ttyLocker ttyl;
1838           // Record any per thread log files
1839           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1840         }
1841         return;
1842       }
1843     }
1844     warning("Cannot open log file: %s", file_name);
1845 }
1846 
1847 // ------------------------------------------------------------------
1848 // CompileBroker::set_should_block
1849 //
1850 // Set _should_block.
1851 // Call this from the VM, with Threads_lock held and a safepoint requested.
1852 void CompileBroker::set_should_block() {
1853   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1854   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1855 #ifndef PRODUCT
1856   if (PrintCompilation && (Verbose || WizardMode))
1857     tty->print_cr("notifying compiler thread pool to block");
1858 #endif
1859   _should_block = true;
1860 }
1861 
1862 // ------------------------------------------------------------------
1863 // CompileBroker::maybe_block
1864 //
1865 // Call this from the compiler at convenient points, to poll for _should_block.
1866 void CompileBroker::maybe_block() {
1867   if (_should_block) {
1868 #ifndef PRODUCT
1869     if (PrintCompilation && (Verbose || WizardMode))
1870       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1871 #endif
1872     ThreadInVMfromNative tivfn(JavaThread::current());
1873   }
1874 }
1875 
1876 // wrapper for CodeCache::print_summary()
1877 static void codecache_print(bool detailed)
1878 {
1879   ResourceMark rm;
1880   stringStream s;
1881   // Dump code cache  into a buffer before locking the tty,
1882   {
1883     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1884     CodeCache::print_summary(&s, detailed);
1885   }
1886   ttyLocker ttyl;
1887   tty->print("%s", s.as_string());
1888 }
1889 
1890 // ------------------------------------------------------------------
1891 // CompileBroker::invoke_compiler_on_method
1892 //
1893 // Compile a method.
1894 //
1895 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1896   if (PrintCompilation) {
1897     ResourceMark rm;
1898     task->print_tty();
1899   }
1900   elapsedTimer time;
1901 
1902   CompilerThread* thread = CompilerThread::current();
1903   ResourceMark rm(thread);
1904 
1905   if (LogEvents) {
1906     _compilation_log->log_compile(thread, task);
1907   }
1908 
1909   // Common flags.
1910   uint compile_id = task->compile_id();
1911   int osr_bci = task->osr_bci();
1912   bool is_osr = (osr_bci != standard_entry_bci);
1913   bool should_log = (thread->log() != NULL);
1914   bool should_break = false;
1915   int task_level = task->comp_level();
1916   {
1917     // create the handle inside it's own block so it can't
1918     // accidentally be referenced once the thread transitions to
1919     // native.  The NoHandleMark before the transition should catch
1920     // any cases where this occurs in the future.
1921     methodHandle method(thread, task->method());
1922     should_break = check_break_at(method, compile_id, is_osr);
1923     if (should_log && !CompilerOracle::should_log(method)) {
1924       should_log = false;
1925     }
1926     assert(!method->is_native(), "no longer compile natives");
1927 
1928     // Save information about this method in case of failure.
1929     set_last_compile(thread, method, is_osr, task_level);
1930 
1931     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1932   }
1933 
1934   // Allocate a new set of JNI handles.
1935   push_jni_handle_block();
1936   Method* target_handle = task->method();
1937   int compilable = ciEnv::MethodCompilable;
1938   {
1939     int system_dictionary_modification_counter;
1940     {
1941       MutexLocker locker(Compile_lock, thread);
1942       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1943     }
1944 
1945     NoHandleMark  nhm;
1946     ThreadToNativeFromVM ttn(thread);
1947 
1948     ciEnv ci_env(task, system_dictionary_modification_counter);
1949     if (should_break) {
1950       ci_env.set_break_at_compile(true);
1951     }
1952     if (should_log) {
1953       ci_env.set_log(thread->log());
1954     }
1955     assert(thread->env() == &ci_env, "set by ci_env");
1956     // The thread-env() field is cleared in ~CompileTaskWrapper.
1957 
1958     // Cache Jvmti state
1959     ci_env.cache_jvmti_state();
1960 
1961     // Cache DTrace flags
1962     ci_env.cache_dtrace_flags();
1963 
1964     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1965 
1966     TraceTime t1("compilation", &time);
1967     EventCompilation event;
1968 
1969     AbstractCompiler *comp = compiler(task_level);
1970     if (comp == NULL) {
1971       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1972     } else {
1973       comp->compile_method(&ci_env, target, osr_bci);
1974     }
1975 
1976     if (!ci_env.failing() && task->code() == NULL) {
1977       //assert(false, "compiler should always document failure");
1978       // The compiler elected, without comment, not to register a result.
1979       // Do not attempt further compilations of this method.
1980       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1981     }
1982 
1983     // Copy this bit to the enclosing block:
1984     compilable = ci_env.compilable();
1985 
1986     if (ci_env.failing()) {
1987       task->set_failure_reason(ci_env.failure_reason());
1988       const char* retry_message = ci_env.retry_message();
1989       if (_compilation_log != NULL) {
1990         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1991       }
1992       if (PrintCompilation) {
1993         FormatBufferResource msg = retry_message != NULL ?
1994             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1995             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1996         task->print_compilation(tty, msg);
1997       }
1998     } else {
1999       task->mark_success();
2000       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2001       if (_compilation_log != NULL) {
2002         nmethod* code = task->code();
2003         if (code != NULL) {
2004           _compilation_log->log_nmethod(thread, code);
2005         }
2006       }
2007     }
2008     // simulate crash during compilation
2009     assert(task->compile_id() != CICrashAt, "just as planned");
2010     if (event.should_commit()) {
2011       event.set_method(target->get_Method());
2012       event.set_compileID(compile_id);
2013       event.set_compileLevel(task->comp_level());
2014       event.set_succeded(task->is_success());
2015       event.set_isOsr(is_osr);
2016       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2017       event.set_inlinedBytes(task->num_inlined_bytecodes());
2018       event.commit();
2019     }
2020   }
2021   pop_jni_handle_block();
2022 
2023   methodHandle method(thread, task->method());
2024 
2025   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2026 
2027   collect_statistics(thread, time, task);
2028 
2029   if (PrintCompilation && PrintCompilation2) {
2030     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
2031     tty->print("%4d ", compile_id);    // print compilation number
2032     tty->print("%s ", (is_osr ? "%" : " "));
2033     if (task->code() != NULL) {
2034       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2035     }
2036     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2037   }
2038 
2039   if (PrintCodeCacheOnCompilation)
2040     codecache_print(/* detailed= */ false);
2041 
2042   // Disable compilation, if required.
2043   switch (compilable) {
2044   case ciEnv::MethodCompilable_never:
2045     if (is_osr)
2046       method->set_not_osr_compilable_quietly();
2047     else
2048       method->set_not_compilable_quietly();
2049     break;
2050   case ciEnv::MethodCompilable_not_at_tier:
2051     if (is_osr)
2052       method->set_not_osr_compilable_quietly(task_level);
2053     else
2054       method->set_not_compilable_quietly(task_level);
2055     break;
2056   }
2057 
2058   // Note that the queued_for_compilation bits are cleared without
2059   // protection of a mutex. [They were set by the requester thread,
2060   // when adding the task to the compile queue -- at which time the
2061   // compile queue lock was held. Subsequently, we acquired the compile
2062   // queue lock to get this task off the compile queue; thus (to belabour
2063   // the point somewhat) our clearing of the bits must be occurring
2064   // only after the setting of the bits. See also 14012000 above.
2065   method->clear_queued_for_compilation();
2066 
2067 #ifdef ASSERT
2068   if (CollectedHeap::fired_fake_oom()) {
2069     // The current compile received a fake OOM during compilation so
2070     // go ahead and exit the VM since the test apparently succeeded
2071     tty->print_cr("*** Shutting down VM after successful fake OOM");
2072     vm_exit(0);
2073   }
2074 #endif
2075 }
2076 
2077 /**
2078  * The CodeCache is full.  Print out warning and disable compilation
2079  * or try code cache cleaning so compilation can continue later.
2080  */
2081 void CompileBroker::handle_full_code_cache() {
2082   UseInterpreter = true;
2083   if (UseCompiler || AlwaysCompileLoopMethods ) {
2084     if (xtty != NULL) {
2085       ResourceMark rm;
2086       stringStream s;
2087       // Dump code cache state into a buffer before locking the tty,
2088       // because log_state() will use locks causing lock conflicts.
2089       CodeCache::log_state(&s);
2090       // Lock to prevent tearing
2091       ttyLocker ttyl;
2092       xtty->begin_elem("code_cache_full");
2093       xtty->print("%s", s.as_string());
2094       xtty->stamp();
2095       xtty->end_elem();
2096     }
2097 
2098     CodeCache::report_codemem_full();
2099 
2100 #ifndef PRODUCT
2101     if (CompileTheWorld || ExitOnFullCodeCache) {
2102       codecache_print(/* detailed= */ true);
2103       before_exit(JavaThread::current());
2104       exit_globals(); // will delete tty
2105       vm_direct_exit(CompileTheWorld ? 0 : 1);
2106     }
2107 #endif
2108     if (UseCodeCacheFlushing) {
2109       // Since code cache is full, immediately stop new compiles
2110       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2111         NMethodSweeper::log_sweep("disable_compiler");
2112       }
2113       // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2114       // without having to consider the state in which the current thread is.
2115       ThreadInVMfromUnknown in_vm;
2116       NMethodSweeper::possibly_sweep();
2117     } else {
2118       disable_compilation_forever();
2119     }
2120 
2121     // Print warning only once
2122     if (should_print_compiler_warning()) {
2123       warning("CodeCache is full. Compiler has been disabled.");
2124       warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2125       codecache_print(/* detailed= */ true);
2126     }
2127   }
2128 }
2129 
2130 // ------------------------------------------------------------------
2131 // CompileBroker::set_last_compile
2132 //
2133 // Record this compilation for debugging purposes.
2134 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2135   ResourceMark rm;
2136   char* method_name = method->name()->as_C_string();
2137   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2138   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2139   char current_method[CompilerCounters::cmname_buffer_length];
2140   size_t maxLen = CompilerCounters::cmname_buffer_length;
2141 
2142   if (UsePerfData) {
2143     const char* class_name = method->method_holder()->name()->as_C_string();
2144 
2145     size_t s1len = strlen(class_name);
2146     size_t s2len = strlen(method_name);
2147 
2148     // check if we need to truncate the string
2149     if (s1len + s2len + 2 > maxLen) {
2150 
2151       // the strategy is to lop off the leading characters of the
2152       // class name and the trailing characters of the method name.
2153 
2154       if (s2len + 2 > maxLen) {
2155         // lop of the entire class name string, let snprintf handle
2156         // truncation of the method name.
2157         class_name += s1len; // null string
2158       }
2159       else {
2160         // lop off the extra characters from the front of the class name
2161         class_name += ((s1len + s2len + 2) - maxLen);
2162       }
2163     }
2164 
2165     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2166   }
2167 
2168   if (CICountOSR && is_osr) {
2169     _last_compile_type = osr_compile;
2170   } else {
2171     _last_compile_type = normal_compile;
2172   }
2173   _last_compile_level = comp_level;
2174 
2175   if (UsePerfData) {
2176     CompilerCounters* counters = thread->counters();
2177     counters->set_current_method(current_method);
2178     counters->set_compile_type((jlong)_last_compile_type);
2179   }
2180 }
2181 
2182 
2183 // ------------------------------------------------------------------
2184 // CompileBroker::push_jni_handle_block
2185 //
2186 // Push on a new block of JNI handles.
2187 void CompileBroker::push_jni_handle_block() {
2188   JavaThread* thread = JavaThread::current();
2189 
2190   // Allocate a new block for JNI handles.
2191   // Inlined code from jni_PushLocalFrame()
2192   JNIHandleBlock* java_handles = thread->active_handles();
2193   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2194   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2195   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2196   thread->set_active_handles(compile_handles);
2197 }
2198 
2199 
2200 // ------------------------------------------------------------------
2201 // CompileBroker::pop_jni_handle_block
2202 //
2203 // Pop off the current block of JNI handles.
2204 void CompileBroker::pop_jni_handle_block() {
2205   JavaThread* thread = JavaThread::current();
2206 
2207   // Release our JNI handle block
2208   JNIHandleBlock* compile_handles = thread->active_handles();
2209   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2210   thread->set_active_handles(java_handles);
2211   compile_handles->set_pop_frame_link(NULL);
2212   JNIHandleBlock::release_block(compile_handles, thread); // may block
2213 }
2214 
2215 
2216 // ------------------------------------------------------------------
2217 // CompileBroker::check_break_at
2218 //
2219 // Should the compilation break at the current compilation.
2220 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2221   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2222     return true;
2223   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2224     return true;
2225   } else {
2226     return (compile_id == CIBreakAt);
2227   }
2228 }
2229 
2230 // ------------------------------------------------------------------
2231 // CompileBroker::collect_statistics
2232 //
2233 // Collect statistics about the compilation.
2234 
2235 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2236   bool success = task->is_success();
2237   methodHandle method (thread, task->method());
2238   uint compile_id = task->compile_id();
2239   bool is_osr = (task->osr_bci() != standard_entry_bci);
2240   nmethod* code = task->code();
2241   CompilerCounters* counters = thread->counters();
2242 
2243   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2244   MutexLocker locker(CompileStatistics_lock);
2245 
2246   // _perf variables are production performance counters which are
2247   // updated regardless of the setting of the CITime and CITimeEach flags
2248   //
2249   if (!success) {
2250     _total_bailout_count++;
2251     if (UsePerfData) {
2252       _perf_last_failed_method->set_value(counters->current_method());
2253       _perf_last_failed_type->set_value(counters->compile_type());
2254       _perf_total_bailout_count->inc();
2255     }
2256   } else if (code == NULL) {
2257     if (UsePerfData) {
2258       _perf_last_invalidated_method->set_value(counters->current_method());
2259       _perf_last_invalidated_type->set_value(counters->compile_type());
2260       _perf_total_invalidated_count->inc();
2261     }
2262     _total_invalidated_count++;
2263   } else {
2264     // Compilation succeeded
2265 
2266     // update compilation ticks - used by the implementation of
2267     // java.lang.management.CompilationMBean
2268     _perf_total_compilation->inc(time.ticks());
2269 
2270     _t_total_compilation.add(time);
2271     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2272 
2273     if (CITime) {
2274       if (is_osr) {
2275         _t_osr_compilation.add(time);
2276         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2277       } else {
2278         _t_standard_compilation.add(time);
2279         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2280       }
2281     }
2282 
2283     if (UsePerfData) {
2284       // save the name of the last method compiled
2285       _perf_last_method->set_value(counters->current_method());
2286       _perf_last_compile_type->set_value(counters->compile_type());
2287       _perf_last_compile_size->set_value(method->code_size() +
2288                                          task->num_inlined_bytecodes());
2289       if (is_osr) {
2290         _perf_osr_compilation->inc(time.ticks());
2291         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2292       } else {
2293         _perf_standard_compilation->inc(time.ticks());
2294         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2295       }
2296     }
2297 
2298     if (CITimeEach) {
2299       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2300       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2301                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2302     }
2303 
2304     // Collect counts of successful compilations
2305     _sum_nmethod_size      += code->total_size();
2306     _sum_nmethod_code_size += code->insts_size();
2307     _total_compile_count++;
2308 
2309     if (UsePerfData) {
2310       _perf_sum_nmethod_size->inc(     code->total_size());
2311       _perf_sum_nmethod_code_size->inc(code->insts_size());
2312       _perf_total_compile_count->inc();
2313     }
2314 
2315     if (is_osr) {
2316       if (UsePerfData) _perf_total_osr_compile_count->inc();
2317       _total_osr_compile_count++;
2318     } else {
2319       if (UsePerfData) _perf_total_standard_compile_count->inc();
2320       _total_standard_compile_count++;
2321     }
2322   }
2323   // set the current method for the thread to null
2324   if (UsePerfData) counters->set_current_method("");
2325 }
2326 
2327 const char* CompileBroker::compiler_name(int comp_level) {
2328   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2329   if (comp == NULL) {
2330     return "no compiler";
2331   } else {
2332     return (comp->name());
2333   }
2334 }
2335 
2336 void CompileBroker::print_times() {
2337   tty->cr();
2338   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2339   tty->print_cr("------------------------------------------------");
2340                //0000000000111111111122222222223333333333444444444455555555556666666666
2341                //0123456789012345678901234567890123456789012345678901234567890123456789
2342   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2343   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2344                 CompileBroker::_t_standard_compilation.seconds(),
2345                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2346   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);
2347 
2348   AbstractCompiler *comp = compiler(CompLevel_simple);
2349   if (comp != NULL) {
2350     comp->print_timers();
2351   }
2352   comp = compiler(CompLevel_full_optimization);
2353   if (comp != NULL) {
2354     comp->print_timers();
2355   }
2356   tty->cr();
2357   tty->print_cr("  Total compiled methods   : %6d methods", CompileBroker::_total_compile_count);
2358   tty->print_cr("    Standard compilation   : %6d methods", CompileBroker::_total_standard_compile_count);
2359   tty->print_cr("    On stack replacement   : %6d methods", CompileBroker::_total_osr_compile_count);
2360   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2361   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2362   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2363   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2364   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2365   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2366   tty->cr();
2367   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2368   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2369 }
2370 
2371 // Debugging output for failure
2372 void CompileBroker::print_last_compile() {
2373   if ( _last_compile_level != CompLevel_none &&
2374        compiler(_last_compile_level) != NULL &&
2375        _last_method_compiled != NULL &&
2376        _last_compile_type != no_compile) {
2377     if (_last_compile_type == osr_compile) {
2378       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2379                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2380     } else {
2381       tty->print_cr("Last parse:  %d+++(%d) %s",
2382                     _compilation_id, _last_compile_level, _last_method_compiled);
2383     }
2384   }
2385 }
2386 
2387 
2388 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2389 #ifndef PRODUCT
2390   st->print_cr("Compiler thread printing unimplemented.");
2391   st->cr();
2392 #endif
2393 }