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 elapsedTimer CompileBroker::_t_invalidated_compilation;
 141 elapsedTimer CompileBroker::_t_bailedout_compilation;
 142 
 143 int CompileBroker::_total_bailout_count          = 0;
 144 int CompileBroker::_total_invalidated_count      = 0;
 145 int CompileBroker::_total_compile_count          = 0;
 146 int CompileBroker::_total_osr_compile_count      = 0;
 147 int CompileBroker::_total_standard_compile_count = 0;
 148 
 149 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 150 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 151 int CompileBroker::_sum_nmethod_size             = 0;
 152 int CompileBroker::_sum_nmethod_code_size        = 0;
 153 
 154 long CompileBroker::_peak_compilation_time       = 0;
 155 
 156 CompileQueue* CompileBroker::_c2_compile_queue   = NULL;
 157 CompileQueue* CompileBroker::_c1_compile_queue   = 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  * Get the next CompileTask from a CompileQueue
 652  */
 653 CompileTask* CompileQueue::get() {
 654   MutexLocker locker(lock());
 655   // If _first is NULL we have no more compile jobs. There are two reasons for
 656   // having no compile jobs: First, we compiled everything we wanted. Second,
 657   // we ran out of code cache so compilation has been disabled. In the latter
 658   // case we perform code cache sweeps to free memory such that we can re-enable
 659   // compilation.
 660   while (_first == NULL) {
 661     // Exit loop if compilation is disabled forever
 662     if (CompileBroker::is_compilation_disabled_forever()) {
 663       return NULL;
 664     }
 665 
 666     // If there are no compilation tasks and we can compile new jobs
 667     // (i.e., there is enough free space in the code cache) there is
 668     // no need to invoke the sweeper. As a result, the hotness of methods
 669     // remains unchanged. This behavior is desired, since we want to keep
 670     // the stable state, i.e., we do not want to evict methods from the
 671     // code cache if it is unnecessary.
 672     // We need a timed wait here, since compiler threads can exit if compilation
 673     // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 674     // is not critical and we do not want idle compiler threads to wake up too often.
 675     lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 676   }
 677 
 678   if (CompileBroker::is_compilation_disabled_forever()) {
 679     return NULL;
 680   }
 681 
 682   CompileTask* task;
 683   {
 684     No_Safepoint_Verifier nsv;
 685     task = CompilationPolicy::policy()->select_task(this);
 686   }
 687   remove(task);
 688   purge_stale_tasks(); // may temporarily release MCQ lock
 689   return task;
 690 }
 691 
 692 // Clean & deallocate stale compile tasks.
 693 // Temporarily releases MethodCompileQueue lock.
 694 void CompileQueue::purge_stale_tasks() {
 695   assert(lock()->owned_by_self(), "must own lock");
 696   if (_first_stale != NULL) {
 697     // Stale tasks are purged when MCQ lock is released,
 698     // but _first_stale updates are protected by MCQ lock.
 699     // Once task processing starts and MCQ lock is released,
 700     // other compiler threads can reuse _first_stale.
 701     CompileTask* head = _first_stale;
 702     _first_stale = NULL;
 703     {
 704       MutexUnlocker ul(lock());
 705       for (CompileTask* task = head; task != NULL; ) {
 706         CompileTask* next_task = task->next();
 707         CompileTaskWrapper ctw(task); // Frees the task
 708         task->set_failure_reason("stale task");
 709         task = next_task;
 710       }
 711     }
 712   }
 713 }
 714 
 715 void CompileQueue::remove(CompileTask* task) {
 716    assert(lock()->owned_by_self(), "must own lock");
 717   if (task->prev() != NULL) {
 718     task->prev()->set_next(task->next());
 719   } else {
 720     // max is the first element
 721     assert(task == _first, "Sanity");
 722     _first = task->next();
 723   }
 724 
 725   if (task->next() != NULL) {
 726     task->next()->set_prev(task->prev());
 727   } else {
 728     // max is the last element
 729     assert(task == _last, "Sanity");
 730     _last = task->prev();
 731   }
 732   --_size;
 733 }
 734 
 735 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 736   assert(lock()->owned_by_self(), "must own lock");
 737   remove(task);
 738 
 739   // Enqueue the task for reclamation (should be done outside MCQ lock)
 740   task->set_next(_first_stale);
 741   task->set_prev(NULL);
 742   _first_stale = task;
 743 }
 744 
 745 // methods in the compile queue need to be marked as used on the stack
 746 // so that they don't get reclaimed by Redefine Classes
 747 void CompileQueue::mark_on_stack() {
 748   CompileTask* task = _first;
 749   while (task != NULL) {
 750     task->mark_on_stack();
 751     task = task->next();
 752   }
 753 }
 754 
 755 
 756 CompileQueue* CompileBroker::compile_queue(int comp_level) {
 757   if (is_c2_compile(comp_level)) return _c2_compile_queue;
 758   if (is_c1_compile(comp_level)) return _c1_compile_queue;
 759   return NULL;
 760 }
 761 
 762 
 763 void CompileBroker::print_compile_queues(outputStream* st) {
 764   MutexLocker locker(MethodCompileQueue_lock);
 765   if (_c1_compile_queue != NULL) {
 766     _c1_compile_queue->print(st);
 767   }
 768   if (_c2_compile_queue != NULL) {
 769     _c2_compile_queue->print(st);
 770   }
 771 }
 772 
 773 void CompileQueue::print(outputStream* st) {
 774   assert(lock()->owned_by_self(), "must own lock");
 775   st->print_cr("Contents of %s", name());
 776   st->print_cr("----------------------------");
 777   CompileTask* task = _first;
 778   if (task == NULL) {
 779     st->print_cr("Empty");
 780   } else {
 781     while (task != NULL) {
 782       task->print_compilation(st, NULL, true, true);
 783       task = task->next();
 784     }
 785   }
 786   st->print_cr("----------------------------");
 787 }
 788 
 789 void CompileQueue::print_tty() {
 790   ttyLocker ttyl;
 791   print(tty);
 792 }
 793 
 794 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 795 
 796   _current_method[0] = '\0';
 797   _compile_type = CompileBroker::no_compile;
 798 
 799   if (UsePerfData) {
 800     ResourceMark rm;
 801 
 802     // create the thread instance name space string - don't create an
 803     // instance subspace if instance is -1 - keeps the adapterThread
 804     // counters  from having a ".0" namespace.
 805     const char* thread_i = (instance == -1) ? thread_name :
 806                       PerfDataManager::name_space(thread_name, instance);
 807 
 808 
 809     char* name = PerfDataManager::counter_name(thread_i, "method");
 810     _perf_current_method =
 811                PerfDataManager::create_string_variable(SUN_CI, name,
 812                                                        cmname_buffer_length,
 813                                                        _current_method, CHECK);
 814 
 815     name = PerfDataManager::counter_name(thread_i, "type");
 816     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 817                                                           PerfData::U_None,
 818                                                          (jlong)_compile_type,
 819                                                           CHECK);
 820 
 821     name = PerfDataManager::counter_name(thread_i, "time");
 822     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 823                                                  PerfData::U_Ticks, CHECK);
 824 
 825     name = PerfDataManager::counter_name(thread_i, "compiles");
 826     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 827                                                      PerfData::U_Events, CHECK);
 828   }
 829 }
 830 
 831 // ------------------------------------------------------------------
 832 // CompileBroker::compilation_init
 833 //
 834 // Initialize the Compilation object
 835 void CompileBroker::compilation_init() {
 836   _last_method_compiled[0] = '\0';
 837 
 838   // No need to initialize compilation system if we do not use it.
 839   if (!UseCompiler) {
 840     return;
 841   }
 842 #ifndef SHARK
 843   // Set the interface to the current compiler(s).
 844   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 845   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 846 #ifdef COMPILER1
 847   if (c1_count > 0) {
 848     _compilers[0] = new Compiler();
 849   }
 850 #endif // COMPILER1
 851 
 852 #ifdef COMPILER2
 853   if (c2_count > 0) {
 854     _compilers[1] = new C2Compiler();
 855   }
 856 #endif // COMPILER2
 857 
 858 #else // SHARK
 859   int c1_count = 0;
 860   int c2_count = 1;
 861 
 862   _compilers[1] = new SharkCompiler();
 863 #endif // SHARK
 864 
 865   // Start the compiler thread(s) and the sweeper thread
 866   init_compiler_sweeper_threads(c1_count, c2_count);
 867   // totalTime performance counter is always created as it is required
 868   // by the implementation of java.lang.management.CompilationMBean.
 869   {
 870     EXCEPTION_MARK;
 871     _perf_total_compilation =
 872                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 873                                                  PerfData::U_Ticks, CHECK);
 874   }
 875 
 876 
 877   if (UsePerfData) {
 878 
 879     EXCEPTION_MARK;
 880 
 881     // create the jvmstat performance counters
 882     _perf_osr_compilation =
 883                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 884                                                  PerfData::U_Ticks, CHECK);
 885 
 886     _perf_standard_compilation =
 887                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 888                                                  PerfData::U_Ticks, CHECK);
 889 
 890     _perf_total_bailout_count =
 891                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 892                                                  PerfData::U_Events, CHECK);
 893 
 894     _perf_total_invalidated_count =
 895                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 896                                                  PerfData::U_Events, CHECK);
 897 
 898     _perf_total_compile_count =
 899                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 900                                                  PerfData::U_Events, CHECK);
 901     _perf_total_osr_compile_count =
 902                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 903                                                  PerfData::U_Events, CHECK);
 904 
 905     _perf_total_standard_compile_count =
 906                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 907                                                  PerfData::U_Events, CHECK);
 908 
 909     _perf_sum_osr_bytes_compiled =
 910                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 911                                                  PerfData::U_Bytes, CHECK);
 912 
 913     _perf_sum_standard_bytes_compiled =
 914                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 915                                                  PerfData::U_Bytes, CHECK);
 916 
 917     _perf_sum_nmethod_size =
 918                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 919                                                  PerfData::U_Bytes, CHECK);
 920 
 921     _perf_sum_nmethod_code_size =
 922                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 923                                                  PerfData::U_Bytes, CHECK);
 924 
 925     _perf_last_method =
 926                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 927                                        CompilerCounters::cmname_buffer_length,
 928                                        "", CHECK);
 929 
 930     _perf_last_failed_method =
 931             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 932                                        CompilerCounters::cmname_buffer_length,
 933                                        "", CHECK);
 934 
 935     _perf_last_invalidated_method =
 936         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 937                                      CompilerCounters::cmname_buffer_length,
 938                                      "", CHECK);
 939 
 940     _perf_last_compile_type =
 941              PerfDataManager::create_variable(SUN_CI, "lastType",
 942                                               PerfData::U_None,
 943                                               (jlong)CompileBroker::no_compile,
 944                                               CHECK);
 945 
 946     _perf_last_compile_size =
 947              PerfDataManager::create_variable(SUN_CI, "lastSize",
 948                                               PerfData::U_Bytes,
 949                                               (jlong)CompileBroker::no_compile,
 950                                               CHECK);
 951 
 952 
 953     _perf_last_failed_type =
 954              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 955                                               PerfData::U_None,
 956                                               (jlong)CompileBroker::no_compile,
 957                                               CHECK);
 958 
 959     _perf_last_invalidated_type =
 960          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 961                                           PerfData::U_None,
 962                                           (jlong)CompileBroker::no_compile,
 963                                           CHECK);
 964   }
 965 
 966   _initialized = true;
 967 }
 968 
 969 
 970 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
 971                                        AbstractCompiler* comp, bool compiler_thread, TRAPS) {
 972   JavaThread* thread = NULL;
 973   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
 974   instanceKlassHandle klass (THREAD, k);
 975   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 976   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 977 
 978   // Initialize thread_oop to put it into the system threadGroup
 979   Handle thread_group (THREAD,  Universe::system_thread_group());
 980   JavaValue result(T_VOID);
 981   JavaCalls::call_special(&result, thread_oop,
 982                        klass,
 983                        vmSymbols::object_initializer_name(),
 984                        vmSymbols::threadgroup_string_void_signature(),
 985                        thread_group,
 986                        string,
 987                        CHECK_0);
 988 
 989   {
 990     MutexLocker mu(Threads_lock, THREAD);
 991     if (compiler_thread) {
 992       thread = new CompilerThread(queue, counters);
 993     } else {
 994       thread = new CodeCacheSweeperThread();
 995     }
 996     // At this point the new CompilerThread data-races with this startup
 997     // thread (which I believe is the primoridal thread and NOT the VM
 998     // thread).  This means Java bytecodes being executed at startup can
 999     // queue compile jobs which will run at whatever default priority the
1000     // newly created CompilerThread runs at.
1001 
1002 
1003     // At this point it may be possible that no osthread was created for the
1004     // JavaThread due to lack of memory. We would have to throw an exception
1005     // in that case. However, since this must work and we do not allow
1006     // exceptions anyway, check and abort if this fails.
1007 
1008     if (thread == NULL || thread->osthread() == NULL) {
1009       vm_exit_during_initialization("java.lang.OutOfMemoryError",
1010                                     os::native_thread_creation_failed_msg());
1011     }
1012 
1013     java_lang_Thread::set_thread(thread_oop(), thread);
1014 
1015     // Note that this only sets the JavaThread _priority field, which by
1016     // definition is limited to Java priorities and not OS priorities.
1017     // The os-priority is set in the CompilerThread startup code itself
1018 
1019     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1020 
1021     // Note that we cannot call os::set_priority because it expects Java
1022     // priorities and we are *explicitly* using OS priorities so that it's
1023     // possible to set the compiler thread priority higher than any Java
1024     // thread.
1025 
1026     int native_prio = CompilerThreadPriority;
1027     if (native_prio == -1) {
1028       if (UseCriticalCompilerThreadPriority) {
1029         native_prio = os::java_to_os_priority[CriticalPriority];
1030       } else {
1031         native_prio = os::java_to_os_priority[NearMaxPriority];
1032       }
1033     }
1034     os::set_native_priority(thread, native_prio);
1035 
1036     java_lang_Thread::set_daemon(thread_oop());
1037 
1038     thread->set_threadObj(thread_oop());
1039     if (compiler_thread) {
1040       thread->as_CompilerThread()->set_compiler(comp);
1041     }
1042     Threads::add(thread);
1043     Thread::start(thread);
1044   }
1045 
1046   // Let go of Threads_lock before yielding
1047   os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1048 
1049   return thread;
1050 }
1051 
1052 
1053 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
1054   EXCEPTION_MARK;
1055 #if !defined(ZERO) && !defined(SHARK)
1056   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1057 #endif // !ZERO && !SHARK
1058   // Initialize the compilation queue
1059   if (c2_compiler_count > 0) {
1060     _c2_compile_queue  = new CompileQueue("C2 compile queue",  MethodCompileQueue_lock);
1061     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1062   }
1063   if (c1_compiler_count > 0) {
1064     _c1_compile_queue  = new CompileQueue("C1 compile queue",  MethodCompileQueue_lock);
1065     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1066   }
1067 
1068   int compiler_count = c1_compiler_count + c2_compiler_count;
1069 
1070   char name_buffer[256];
1071   const bool compiler_thread = true;
1072   for (int i = 0; i < c2_compiler_count; i++) {
1073     // Create a name for our thread.
1074     sprintf(name_buffer, "C2 CompilerThread%d", i);
1075     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1076     // Shark and C2
1077     make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
1078   }
1079 
1080   for (int i = c2_compiler_count; i < compiler_count; i++) {
1081     // Create a name for our thread.
1082     sprintf(name_buffer, "C1 CompilerThread%d", i);
1083     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1084     // C1
1085     make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
1086   }
1087 
1088   if (UsePerfData) {
1089     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1090   }
1091 
1092   if (MethodFlushing) {
1093     // Initialize the sweeper thread
1094     make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
1095   }
1096 }
1097 
1098 
1099 /**
1100  * Set the methods on the stack as on_stack so that redefine classes doesn't
1101  * reclaim them. This method is executed at a safepoint.
1102  */
1103 void CompileBroker::mark_on_stack() {
1104   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1105   // Since we are at a safepoint, we do not need a lock to access
1106   // the compile queues.
1107   if (_c2_compile_queue != NULL) {
1108     _c2_compile_queue->mark_on_stack();
1109   }
1110   if (_c1_compile_queue != NULL) {
1111     _c1_compile_queue->mark_on_stack();
1112   }
1113 }
1114 
1115 // ------------------------------------------------------------------
1116 // CompileBroker::compile_method
1117 //
1118 // Request compilation of a method.
1119 void CompileBroker::compile_method_base(methodHandle method,
1120                                         int osr_bci,
1121                                         int comp_level,
1122                                         methodHandle hot_method,
1123                                         int hot_count,
1124                                         const char* comment,
1125                                         Thread* thread) {
1126   // do nothing if compiler thread(s) is not available
1127   if (!_initialized) {
1128     return;
1129   }
1130 
1131   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1132   assert(method->method_holder()->oop_is_instance(),
1133          "sanity check");
1134   assert(!method->method_holder()->is_not_initialized(),
1135          "method holder must be initialized");
1136   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1137 
1138   if (CIPrintRequests) {
1139     tty->print("request: ");
1140     method->print_short_name(tty);
1141     if (osr_bci != InvocationEntryBci) {
1142       tty->print(" osr_bci: %d", osr_bci);
1143     }
1144     tty->print(" comment: %s count: %d", comment, hot_count);
1145     if (!hot_method.is_null()) {
1146       tty->print(" hot: ");
1147       if (hot_method() != method()) {
1148           hot_method->print_short_name(tty);
1149       } else {
1150         tty->print("yes");
1151       }
1152     }
1153     tty->cr();
1154   }
1155 
1156   // A request has been made for compilation.  Before we do any
1157   // real work, check to see if the method has been compiled
1158   // in the meantime with a definitive result.
1159   if (compilation_is_complete(method, osr_bci, comp_level)) {
1160     return;
1161   }
1162 
1163 #ifndef PRODUCT
1164   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1165     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1166       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1167       return;
1168     }
1169   }
1170 #endif
1171 
1172   // If this method is already in the compile queue, then
1173   // we do not block the current thread.
1174   if (compilation_is_in_queue(method)) {
1175     // We may want to decay our counter a bit here to prevent
1176     // multiple denied requests for compilation.  This is an
1177     // open compilation policy issue. Note: The other possibility,
1178     // in the case that this is a blocking compile request, is to have
1179     // all subsequent blocking requesters wait for completion of
1180     // ongoing compiles. Note that in this case we'll need a protocol
1181     // for freeing the associated compile tasks. [Or we could have
1182     // a single static monitor on which all these waiters sleep.]
1183     return;
1184   }
1185 
1186   // If the requesting thread is holding the pending list lock
1187   // then we just return. We can't risk blocking while holding
1188   // the pending list lock or a 3-way deadlock may occur
1189   // between the reference handler thread, a GC (instigated
1190   // by a compiler thread), and compiled method registration.
1191   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1192     return;
1193   }
1194 
1195   if (TieredCompilation) {
1196     // Tiered policy requires MethodCounters to exist before adding a method to
1197     // the queue. Create if we don't have them yet.
1198     method->get_method_counters(thread);
1199   }
1200 
1201   // Outputs from the following MutexLocker block:
1202   CompileTask* task     = NULL;
1203   bool         blocking = false;
1204   CompileQueue* queue  = compile_queue(comp_level);
1205 
1206   // Acquire our lock.
1207   {
1208     MutexLocker locker(queue->lock(), thread);
1209 
1210     // Make sure the method has not slipped into the queues since
1211     // last we checked; note that those checks were "fast bail-outs".
1212     // Here we need to be more careful, see 14012000 below.
1213     if (compilation_is_in_queue(method)) {
1214       return;
1215     }
1216 
1217     // We need to check again to see if the compilation has
1218     // completed.  A previous compilation may have registered
1219     // some result.
1220     if (compilation_is_complete(method, osr_bci, comp_level)) {
1221       return;
1222     }
1223 
1224     // We now know that this compilation is not pending, complete,
1225     // or prohibited.  Assign a compile_id to this compilation
1226     // and check to see if it is in our [Start..Stop) range.
1227     int compile_id = assign_compile_id(method, osr_bci);
1228     if (compile_id == 0) {
1229       // The compilation falls outside the allowed range.
1230       return;
1231     }
1232 
1233     // Should this thread wait for completion of the compile?
1234     blocking = is_compile_blocking();
1235 
1236     // We will enter the compilation in the queue.
1237     // 14012000: Note that this sets the queued_for_compile bits in
1238     // the target method. We can now reason that a method cannot be
1239     // queued for compilation more than once, as follows:
1240     // Before a thread queues a task for compilation, it first acquires
1241     // the compile queue lock, then checks if the method's queued bits
1242     // are set or it has already been compiled. Thus there can not be two
1243     // instances of a compilation task for the same method on the
1244     // compilation queue. Consider now the case where the compilation
1245     // thread has already removed a task for that method from the queue
1246     // and is in the midst of compiling it. In this case, the
1247     // queued_for_compile bits must be set in the method (and these
1248     // will be visible to the current thread, since the bits were set
1249     // under protection of the compile queue lock, which we hold now.
1250     // When the compilation completes, the compiler thread first sets
1251     // the compilation result and then clears the queued_for_compile
1252     // bits. Neither of these actions are protected by a barrier (or done
1253     // under the protection of a lock), so the only guarantee we have
1254     // (on machines with TSO (Total Store Order)) is that these values
1255     // will update in that order. As a result, the only combinations of
1256     // these bits that the current thread will see are, in temporal order:
1257     // <RESULT, QUEUE> :
1258     //     <0, 1> : in compile queue, but not yet compiled
1259     //     <1, 1> : compiled but queue bit not cleared
1260     //     <1, 0> : compiled and queue bit cleared
1261     // Because we first check the queue bits then check the result bits,
1262     // we are assured that we cannot introduce a duplicate task.
1263     // Note that if we did the tests in the reverse order (i.e. check
1264     // result then check queued bit), we could get the result bit before
1265     // the compilation completed, and the queue bit after the compilation
1266     // completed, and end up introducing a "duplicate" (redundant) task.
1267     // In that case, the compiler thread should first check if a method
1268     // has already been compiled before trying to compile it.
1269     // NOTE: in the event that there are multiple compiler threads and
1270     // there is de-optimization/recompilation, things will get hairy,
1271     // and in that case it's best to protect both the testing (here) of
1272     // these bits, and their updating (here and elsewhere) under a
1273     // common lock.
1274     task = create_compile_task(queue,
1275                                compile_id, method,
1276                                osr_bci, comp_level,
1277                                hot_method, hot_count, comment,
1278                                blocking);
1279   }
1280 
1281   if (blocking) {
1282     wait_for_completion(task);
1283   }
1284 }
1285 
1286 
1287 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1288                                        int comp_level,
1289                                        methodHandle hot_method, int hot_count,
1290                                        const char* comment, Thread* THREAD) {
1291   // make sure arguments make sense
1292   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1293   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1294   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1295   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1296   // allow any levels for WhiteBox
1297   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1298   // return quickly if possible
1299 
1300   // lock, make sure that the compilation
1301   // isn't prohibited in a straightforward way.
1302   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1303   if (comp == NULL || !comp->can_compile_method(method) ||
1304       compilation_is_prohibited(method, osr_bci, comp_level)) {
1305     return NULL;
1306   }
1307 
1308   if (osr_bci == InvocationEntryBci) {
1309     // standard compilation
1310     nmethod* method_code = method->code();
1311     if (method_code != NULL) {
1312       if (compilation_is_complete(method, osr_bci, comp_level)) {
1313         return method_code;
1314       }
1315     }
1316     if (method->is_not_compilable(comp_level)) {
1317       return NULL;
1318     }
1319   } else {
1320     // osr compilation
1321 #ifndef TIERED
1322     // seems like an assert of dubious value
1323     assert(comp_level == CompLevel_highest_tier,
1324            "all OSR compiles are assumed to be at a single compilation lavel");
1325 #endif // TIERED
1326     // We accept a higher level osr method
1327     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1328     if (nm != NULL) return nm;
1329     if (method->is_not_osr_compilable(comp_level)) return NULL;
1330   }
1331 
1332   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1333   // some prerequisites that are compiler specific
1334   if (comp->is_c2() || comp->is_shark()) {
1335     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1336     // Resolve all classes seen in the signature of the method
1337     // we are compiling.
1338     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1339   }
1340 
1341   // If the method is native, do the lookup in the thread requesting
1342   // the compilation. Native lookups can load code, which is not
1343   // permitted during compilation.
1344   //
1345   // Note: A native method implies non-osr compilation which is
1346   //       checked with an assertion at the entry of this method.
1347   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1348     bool in_base_library;
1349     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1350     if (HAS_PENDING_EXCEPTION) {
1351       // In case of an exception looking up the method, we just forget
1352       // about it. The interpreter will kick-in and throw the exception.
1353       method->set_not_compilable(); // implies is_not_osr_compilable()
1354       CLEAR_PENDING_EXCEPTION;
1355       return NULL;
1356     }
1357     assert(method->has_native_function(), "must have native code by now");
1358   }
1359 
1360   // RedefineClasses() has replaced this method; just return
1361   if (method->is_old()) {
1362     return NULL;
1363   }
1364 
1365   // JVMTI -- post_compile_event requires jmethod_id() that may require
1366   // a lock the compiling thread can not acquire. Prefetch it here.
1367   if (JvmtiExport::should_post_compiled_method_load()) {
1368     method->jmethod_id();
1369   }
1370 
1371   // do the compilation
1372   if (method->is_native()) {
1373     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1374       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1375       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1376       //
1377       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1378       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1379       AdapterHandlerLibrary::create_native_wrapper(method);
1380     } else {
1381       return NULL;
1382     }
1383   } else {
1384     // If the compiler is shut off due to code cache getting full
1385     // fail out now so blocking compiles dont hang the java thread
1386     if (!should_compile_new_jobs()) {
1387       CompilationPolicy::policy()->delay_compilation(method());
1388       return NULL;
1389     }
1390     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1391   }
1392 
1393   // return requested nmethod
1394   // We accept a higher level osr method
1395   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1396 }
1397 
1398 
1399 // ------------------------------------------------------------------
1400 // CompileBroker::compilation_is_complete
1401 //
1402 // See if compilation of this method is already complete.
1403 bool CompileBroker::compilation_is_complete(methodHandle method,
1404                                             int          osr_bci,
1405                                             int          comp_level) {
1406   bool is_osr = (osr_bci != standard_entry_bci);
1407   if (is_osr) {
1408     if (method->is_not_osr_compilable(comp_level)) {
1409       return true;
1410     } else {
1411       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1412       return (result != NULL);
1413     }
1414   } else {
1415     if (method->is_not_compilable(comp_level)) {
1416       return true;
1417     } else {
1418       nmethod* result = method->code();
1419       if (result == NULL) return false;
1420       return comp_level == result->comp_level();
1421     }
1422   }
1423 }
1424 
1425 
1426 /**
1427  * See if this compilation is already requested.
1428  *
1429  * Implementation note: there is only a single "is in queue" bit
1430  * for each method.  This means that the check below is overly
1431  * conservative in the sense that an osr compilation in the queue
1432  * will block a normal compilation from entering the queue (and vice
1433  * versa).  This can be remedied by a full queue search to disambiguate
1434  * cases.  If it is deemed profitable, this may be done.
1435  */
1436 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1437   return method->queued_for_compilation();
1438 }
1439 
1440 // ------------------------------------------------------------------
1441 // CompileBroker::compilation_is_prohibited
1442 //
1443 // See if this compilation is not allowed.
1444 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1445   bool is_native = method->is_native();
1446   // Some compilers may not support the compilation of natives.
1447   AbstractCompiler *comp = compiler(comp_level);
1448   if (is_native &&
1449       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1450     method->set_not_compilable_quietly(comp_level);
1451     return true;
1452   }
1453 
1454   bool is_osr = (osr_bci != standard_entry_bci);
1455   // Some compilers may not support on stack replacement.
1456   if (is_osr &&
1457       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1458     method->set_not_osr_compilable(comp_level);
1459     return true;
1460   }
1461 
1462   // The method may be explicitly excluded by the user.
1463   bool quietly;
1464   if (CompilerOracle::should_exclude(method, quietly)) {
1465     if (!quietly) {
1466       // This does not happen quietly...
1467       ResourceMark rm;
1468       tty->print("### Excluding %s:%s",
1469                  method->is_native() ? "generation of native wrapper" : "compile",
1470                  (method->is_static() ? " static" : ""));
1471       method->print_short_name(tty);
1472       tty->cr();
1473     }
1474     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1475   }
1476 
1477   return false;
1478 }
1479 
1480 /**
1481  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1482  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1483  * The function also allows to generate separate compilation IDs for OSR compilations.
1484  */
1485 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1486 #ifdef ASSERT
1487   bool is_osr = (osr_bci != standard_entry_bci);
1488   int id;
1489   if (method->is_native()) {
1490     assert(!is_osr, "can't be osr");
1491     // Adapters, native wrappers and method handle intrinsics
1492     // should be generated always.
1493     return Atomic::add(1, &_compilation_id);
1494   } else if (CICountOSR && is_osr) {
1495     id = Atomic::add(1, &_osr_compilation_id);
1496     if (CIStartOSR <= id && id < CIStopOSR) {
1497       return id;
1498     }
1499   } else {
1500     id = Atomic::add(1, &_compilation_id);
1501     if (CIStart <= id && id < CIStop) {
1502       return id;
1503     }
1504   }
1505 
1506   // Method was not in the appropriate compilation range.
1507   method->set_not_compilable_quietly();
1508   return 0;
1509 #else
1510   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1511   // only _compilation_id is incremented.
1512   return Atomic::add(1, &_compilation_id);
1513 #endif
1514 }
1515 
1516 /**
1517  * Should the current thread block until this compilation request
1518  * has been fulfilled?
1519  */
1520 bool CompileBroker::is_compile_blocking() {
1521   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1522   return !BackgroundCompilation;
1523 }
1524 
1525 
1526 // ------------------------------------------------------------------
1527 // CompileBroker::preload_classes
1528 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1529   // Move this code over from c1_Compiler.cpp
1530   ShouldNotReachHere();
1531 }
1532 
1533 
1534 // ------------------------------------------------------------------
1535 // CompileBroker::create_compile_task
1536 //
1537 // Create a CompileTask object representing the current request for
1538 // compilation.  Add this task to the queue.
1539 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1540                                               int           compile_id,
1541                                               methodHandle  method,
1542                                               int           osr_bci,
1543                                               int           comp_level,
1544                                               methodHandle  hot_method,
1545                                               int           hot_count,
1546                                               const char*   comment,
1547                                               bool          blocking) {
1548   CompileTask* new_task = CompileTask::allocate();
1549   new_task->initialize(compile_id, method, osr_bci, comp_level,
1550                        hot_method, hot_count, comment,
1551                        blocking);
1552   queue->add(new_task);
1553   return new_task;
1554 }
1555 
1556 
1557 /**
1558  *  Wait for the compilation task to complete.
1559  */
1560 void CompileBroker::wait_for_completion(CompileTask* task) {
1561   if (CIPrintCompileQueue) {
1562     ttyLocker ttyl;
1563     tty->print_cr("BLOCKING FOR COMPILE");
1564   }
1565 
1566   assert(task->is_blocking(), "can only wait on blocking task");
1567 
1568   JavaThread* thread = JavaThread::current();
1569   thread->set_blocked_on_compilation(true);
1570 
1571   methodHandle method(thread, task->method());
1572   {
1573     MutexLocker waiter(task->lock(), thread);
1574 
1575     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1576       task->lock()->wait();
1577     }
1578   }
1579 
1580   thread->set_blocked_on_compilation(false);
1581   if (is_compilation_disabled_forever()) {
1582     CompileTask::free(task);
1583     return;
1584   }
1585 
1586   // It is harmless to check this status without the lock, because
1587   // completion is a stable property (until the task object is recycled).
1588   assert(task->is_complete(), "Compilation should have completed");
1589   assert(task->code_handle() == NULL, "must be reset");
1590 
1591   // By convention, the waiter is responsible for recycling a
1592   // blocking CompileTask. Since there is only one waiter ever
1593   // waiting on a CompileTask, we know that no one else will
1594   // be using this CompileTask; we can free it.
1595   CompileTask::free(task);
1596 }
1597 
1598 /**
1599  * Initialize compiler thread(s) + compiler object(s). The postcondition
1600  * of this function is that the compiler runtimes are initialized and that
1601  * compiler threads can start compiling.
1602  */
1603 bool CompileBroker::init_compiler_runtime() {
1604   CompilerThread* thread = CompilerThread::current();
1605   AbstractCompiler* comp = thread->compiler();
1606   // Final sanity check - the compiler object must exist
1607   guarantee(comp != NULL, "Compiler object must exist");
1608 
1609   int system_dictionary_modification_counter;
1610   {
1611     MutexLocker locker(Compile_lock, thread);
1612     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1613   }
1614 
1615   {
1616     // Must switch to native to allocate ci_env
1617     ThreadToNativeFromVM ttn(thread);
1618     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1619     // Cache Jvmti state
1620     ci_env.cache_jvmti_state();
1621     // Cache DTrace flags
1622     ci_env.cache_dtrace_flags();
1623 
1624     // Switch back to VM state to do compiler initialization
1625     ThreadInVMfromNative tv(thread);
1626     ResetNoHandleMark rnhm;
1627 
1628 
1629     if (!comp->is_shark()) {
1630       // Perform per-thread and global initializations
1631       comp->initialize();
1632     }
1633   }
1634 
1635   if (comp->is_failed()) {
1636     disable_compilation_forever();
1637     // If compiler initialization failed, no compiler thread that is specific to a
1638     // particular compiler runtime will ever start to compile methods.
1639     shutdown_compiler_runtime(comp, thread);
1640     return false;
1641   }
1642 
1643   // C1 specific check
1644   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1645     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1646     return false;
1647   }
1648 
1649   return true;
1650 }
1651 
1652 /**
1653  * If C1 and/or C2 initialization failed, we shut down all compilation.
1654  * We do this to keep things simple. This can be changed if it ever turns
1655  * out to be a problem.
1656  */
1657 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1658   // Free buffer blob, if allocated
1659   if (thread->get_buffer_blob() != NULL) {
1660     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1661     CodeCache::free(thread->get_buffer_blob());
1662   }
1663 
1664   if (comp->should_perform_shutdown()) {
1665     // There are two reasons for shutting down the compiler
1666     // 1) compiler runtime initialization failed
1667     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1668     warning("%s initialization failed. Shutting down all compilers", comp->name());
1669 
1670     // Only one thread per compiler runtime object enters here
1671     // Set state to shut down
1672     comp->set_shut_down();
1673 
1674     // Delete all queued compilation tasks to make compiler threads exit faster.
1675     if (_c1_compile_queue != NULL) {
1676       _c1_compile_queue->free_all();
1677     }
1678 
1679     if (_c2_compile_queue != NULL) {
1680       _c2_compile_queue->free_all();
1681     }
1682 
1683     // Set flags so that we continue execution with using interpreter only.
1684     UseCompiler    = false;
1685     UseInterpreter = true;
1686 
1687     // We could delete compiler runtimes also. However, there are references to
1688     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1689     // fail. This can be done later if necessary.
1690   }
1691 }
1692 
1693 // ------------------------------------------------------------------
1694 // CompileBroker::compiler_thread_loop
1695 //
1696 // The main loop run by a CompilerThread.
1697 void CompileBroker::compiler_thread_loop() {
1698   CompilerThread* thread = CompilerThread::current();
1699   CompileQueue* queue = thread->queue();
1700   // For the thread that initializes the ciObjectFactory
1701   // this resource mark holds all the shared objects
1702   ResourceMark rm;
1703 
1704   // First thread to get here will initialize the compiler interface
1705 
1706   if (!ciObjectFactory::is_initialized()) {
1707     ASSERT_IN_VM;
1708     MutexLocker only_one (CompileThread_lock, thread);
1709     if (!ciObjectFactory::is_initialized()) {
1710       ciObjectFactory::initialize();
1711     }
1712   }
1713 
1714   // Open a log.
1715   if (LogCompilation) {
1716     init_compiler_thread_log();
1717   }
1718   CompileLog* log = thread->log();
1719   if (log != NULL) {
1720     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1721                     thread->name(),
1722                     os::current_thread_id(),
1723                     os::current_process_id());
1724     log->stamp();
1725     log->end_elem();
1726   }
1727 
1728   // If compiler thread/runtime initialization fails, exit the compiler thread
1729   if (!init_compiler_runtime()) {
1730     return;
1731   }
1732 
1733   // Poll for new compilation tasks as long as the JVM runs. Compilation
1734   // should only be disabled if something went wrong while initializing the
1735   // compiler runtimes. This, in turn, should not happen. The only known case
1736   // when compiler runtime initialization fails is if there is not enough free
1737   // space in the code cache to generate the necessary stubs, etc.
1738   while (!is_compilation_disabled_forever()) {
1739     // We need this HandleMark to avoid leaking VM handles.
1740     HandleMark hm(thread);
1741 
1742     CompileTask* task = queue->get();
1743     if (task == NULL) {
1744       continue;
1745     }
1746 
1747     // Give compiler threads an extra quanta.  They tend to be bursty and
1748     // this helps the compiler to finish up the job.
1749     if (CompilerThreadHintNoPreempt) {
1750       os::hint_no_preempt();
1751     }
1752 
1753     // trace per thread time and compile statistics
1754     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1755     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1756 
1757     // Assign the task to the current thread.  Mark this compilation
1758     // thread as active for the profiler.
1759     CompileTaskWrapper ctw(task);
1760     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1761     task->set_code_handle(&result_handle);
1762     methodHandle method(thread, task->method());
1763 
1764     // Never compile a method if breakpoints are present in it
1765     if (method()->number_of_breakpoints() == 0) {
1766       // Compile the method.
1767       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1768         invoke_compiler_on_method(task);
1769       } else {
1770         // After compilation is disabled, remove remaining methods from queue
1771         method->clear_queued_for_compilation();
1772         task->set_failure_reason("compilation is disabled");
1773       }
1774     }
1775   }
1776 
1777   // Shut down compiler runtime
1778   shutdown_compiler_runtime(thread->compiler(), thread);
1779 }
1780 
1781 // ------------------------------------------------------------------
1782 // CompileBroker::init_compiler_thread_log
1783 //
1784 // Set up state required by +LogCompilation.
1785 void CompileBroker::init_compiler_thread_log() {
1786     CompilerThread* thread = CompilerThread::current();
1787     char  file_name[4*K];
1788     FILE* fp = NULL;
1789     intx thread_id = os::current_thread_id();
1790     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1791       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1792       if (dir == NULL) {
1793         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1794                      thread_id, os::current_process_id());
1795       } else {
1796         jio_snprintf(file_name, sizeof(file_name),
1797                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1798                      os::file_separator(), thread_id, os::current_process_id());
1799       }
1800 
1801       fp = fopen(file_name, "at");
1802       if (fp != NULL) {
1803         if (LogCompilation && Verbose) {
1804           tty->print_cr("Opening compilation log %s", file_name);
1805         }
1806         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1807         thread->init_log(log);
1808 
1809         if (xtty != NULL) {
1810           ttyLocker ttyl;
1811           // Record any per thread log files
1812           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1813         }
1814         return;
1815       }
1816     }
1817     warning("Cannot open log file: %s", file_name);
1818 }
1819 
1820 // ------------------------------------------------------------------
1821 // CompileBroker::set_should_block
1822 //
1823 // Set _should_block.
1824 // Call this from the VM, with Threads_lock held and a safepoint requested.
1825 void CompileBroker::set_should_block() {
1826   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1827   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1828 #ifndef PRODUCT
1829   if (PrintCompilation && (Verbose || WizardMode))
1830     tty->print_cr("notifying compiler thread pool to block");
1831 #endif
1832   _should_block = true;
1833 }
1834 
1835 // ------------------------------------------------------------------
1836 // CompileBroker::maybe_block
1837 //
1838 // Call this from the compiler at convenient points, to poll for _should_block.
1839 void CompileBroker::maybe_block() {
1840   if (_should_block) {
1841 #ifndef PRODUCT
1842     if (PrintCompilation && (Verbose || WizardMode))
1843       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1844 #endif
1845     ThreadInVMfromNative tivfn(JavaThread::current());
1846   }
1847 }
1848 
1849 // wrapper for CodeCache::print_summary()
1850 static void codecache_print(bool detailed)
1851 {
1852   ResourceMark rm;
1853   stringStream s;
1854   // Dump code cache  into a buffer before locking the tty,
1855   {
1856     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1857     CodeCache::print_summary(&s, detailed);
1858   }
1859   ttyLocker ttyl;
1860   tty->print("%s", s.as_string());
1861 }
1862 
1863 // ------------------------------------------------------------------
1864 // CompileBroker::invoke_compiler_on_method
1865 //
1866 // Compile a method.
1867 //
1868 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1869   if (PrintCompilation) {
1870     ResourceMark rm;
1871     task->print_tty();
1872   }
1873   elapsedTimer time;
1874 
1875   CompilerThread* thread = CompilerThread::current();
1876   ResourceMark rm(thread);
1877 
1878   if (LogEvents) {
1879     _compilation_log->log_compile(thread, task);
1880   }
1881 
1882   // Common flags.
1883   uint compile_id = task->compile_id();
1884   int osr_bci = task->osr_bci();
1885   bool is_osr = (osr_bci != standard_entry_bci);
1886   bool should_log = (thread->log() != NULL);
1887   bool should_break = false;
1888   int task_level = task->comp_level();
1889   {
1890     // create the handle inside it's own block so it can't
1891     // accidentally be referenced once the thread transitions to
1892     // native.  The NoHandleMark before the transition should catch
1893     // any cases where this occurs in the future.
1894     methodHandle method(thread, task->method());
1895     should_break = check_break_at(method, compile_id, is_osr);
1896     if (should_log && !CompilerOracle::should_log(method)) {
1897       should_log = false;
1898     }
1899     assert(!method->is_native(), "no longer compile natives");
1900 
1901     // Save information about this method in case of failure.
1902     set_last_compile(thread, method, is_osr, task_level);
1903 
1904     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1905   }
1906 
1907   // Allocate a new set of JNI handles.
1908   push_jni_handle_block();
1909   Method* target_handle = task->method();
1910   int compilable = ciEnv::MethodCompilable;
1911   {
1912     int system_dictionary_modification_counter;
1913     {
1914       MutexLocker locker(Compile_lock, thread);
1915       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1916     }
1917 
1918     NoHandleMark  nhm;
1919     ThreadToNativeFromVM ttn(thread);
1920 
1921     ciEnv ci_env(task, system_dictionary_modification_counter);
1922     if (should_break) {
1923       ci_env.set_break_at_compile(true);
1924     }
1925     if (should_log) {
1926       ci_env.set_log(thread->log());
1927     }
1928     assert(thread->env() == &ci_env, "set by ci_env");
1929     // The thread-env() field is cleared in ~CompileTaskWrapper.
1930 
1931     // Cache Jvmti state
1932     ci_env.cache_jvmti_state();
1933 
1934     // Cache DTrace flags
1935     ci_env.cache_dtrace_flags();
1936 
1937     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1938 
1939     TraceTime t1("compilation", &time);
1940     EventCompilation event;
1941 
1942     AbstractCompiler *comp = compiler(task_level);
1943     if (comp == NULL) {
1944       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1945     } else {
1946       comp->compile_method(&ci_env, target, osr_bci);
1947     }
1948 
1949     if (!ci_env.failing() && task->code() == NULL) {
1950       //assert(false, "compiler should always document failure");
1951       // The compiler elected, without comment, not to register a result.
1952       // Do not attempt further compilations of this method.
1953       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1954     }
1955 
1956     // Copy this bit to the enclosing block:
1957     compilable = ci_env.compilable();
1958 
1959     if (ci_env.failing()) {
1960       task->set_failure_reason(ci_env.failure_reason());
1961       const char* retry_message = ci_env.retry_message();
1962       if (_compilation_log != NULL) {
1963         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1964       }
1965       if (PrintCompilation) {
1966         FormatBufferResource msg = retry_message != NULL ?
1967             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1968             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1969         task->print_compilation(tty, msg);
1970       }
1971     } else {
1972       task->mark_success();
1973       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1974       if (_compilation_log != NULL) {
1975         nmethod* code = task->code();
1976         if (code != NULL) {
1977           _compilation_log->log_nmethod(thread, code);
1978         }
1979       }
1980     }
1981     // simulate crash during compilation
1982     assert(task->compile_id() != CICrashAt, "just as planned");
1983     if (event.should_commit()) {
1984       event.set_method(target->get_Method());
1985       event.set_compileID(compile_id);
1986       event.set_compileLevel(task->comp_level());
1987       event.set_succeded(task->is_success());
1988       event.set_isOsr(is_osr);
1989       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1990       event.set_inlinedBytes(task->num_inlined_bytecodes());
1991       event.commit();
1992     }
1993   }
1994   pop_jni_handle_block();
1995 
1996   methodHandle method(thread, task->method());
1997 
1998   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1999 
2000   collect_statistics(thread, time, task);
2001 
2002   if (PrintCompilation && PrintCompilation2) {
2003     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
2004     tty->print("%4d ", compile_id);    // print compilation number
2005     tty->print("%s ", (is_osr ? "%" : " "));
2006     if (task->code() != NULL) {
2007       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2008     }
2009     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2010   }
2011 
2012   if (PrintCodeCacheOnCompilation)
2013     codecache_print(/* detailed= */ false);
2014 
2015   // Disable compilation, if required.
2016   switch (compilable) {
2017   case ciEnv::MethodCompilable_never:
2018     if (is_osr)
2019       method->set_not_osr_compilable_quietly();
2020     else
2021       method->set_not_compilable_quietly();
2022     break;
2023   case ciEnv::MethodCompilable_not_at_tier:
2024     if (is_osr)
2025       method->set_not_osr_compilable_quietly(task_level);
2026     else
2027       method->set_not_compilable_quietly(task_level);
2028     break;
2029   }
2030 
2031   // Note that the queued_for_compilation bits are cleared without
2032   // protection of a mutex. [They were set by the requester thread,
2033   // when adding the task to the compile queue -- at which time the
2034   // compile queue lock was held. Subsequently, we acquired the compile
2035   // queue lock to get this task off the compile queue; thus (to belabour
2036   // the point somewhat) our clearing of the bits must be occurring
2037   // only after the setting of the bits. See also 14012000 above.
2038   method->clear_queued_for_compilation();
2039 
2040 #ifdef ASSERT
2041   if (CollectedHeap::fired_fake_oom()) {
2042     // The current compile received a fake OOM during compilation so
2043     // go ahead and exit the VM since the test apparently succeeded
2044     tty->print_cr("*** Shutting down VM after successful fake OOM");
2045     vm_exit(0);
2046   }
2047 #endif
2048 }
2049 
2050 /**
2051  * The CodeCache is full.  Print out warning and disable compilation
2052  * or try code cache cleaning so compilation can continue later.
2053  */
2054 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2055   UseInterpreter = true;
2056   if (UseCompiler || AlwaysCompileLoopMethods ) {
2057     if (xtty != NULL) {
2058       ResourceMark rm;
2059       stringStream s;
2060       // Dump code cache state into a buffer before locking the tty,
2061       // because log_state() will use locks causing lock conflicts.
2062       CodeCache::log_state(&s);
2063       // Lock to prevent tearing
2064       ttyLocker ttyl;
2065       xtty->begin_elem("code_cache_full");
2066       xtty->print("%s", s.as_string());
2067       xtty->stamp();
2068       xtty->end_elem();
2069     }
2070 
2071 #ifndef PRODUCT
2072     if (CompileTheWorld || ExitOnFullCodeCache) {
2073       codecache_print(/* detailed= */ true);
2074       before_exit(JavaThread::current());
2075       exit_globals(); // will delete tty
2076       vm_direct_exit(CompileTheWorld ? 0 : 1);
2077     }
2078 #endif
2079     if (UseCodeCacheFlushing) {
2080       // Since code cache is full, immediately stop new compiles
2081       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2082         NMethodSweeper::log_sweep("disable_compiler");
2083       }
2084     } else {
2085       disable_compilation_forever();
2086     }
2087 
2088     CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2089   }
2090 }
2091 
2092 // ------------------------------------------------------------------
2093 // CompileBroker::set_last_compile
2094 //
2095 // Record this compilation for debugging purposes.
2096 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2097   ResourceMark rm;
2098   char* method_name = method->name()->as_C_string();
2099   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2100   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2101   char current_method[CompilerCounters::cmname_buffer_length];
2102   size_t maxLen = CompilerCounters::cmname_buffer_length;
2103 
2104   if (UsePerfData) {
2105     const char* class_name = method->method_holder()->name()->as_C_string();
2106 
2107     size_t s1len = strlen(class_name);
2108     size_t s2len = strlen(method_name);
2109 
2110     // check if we need to truncate the string
2111     if (s1len + s2len + 2 > maxLen) {
2112 
2113       // the strategy is to lop off the leading characters of the
2114       // class name and the trailing characters of the method name.
2115 
2116       if (s2len + 2 > maxLen) {
2117         // lop of the entire class name string, let snprintf handle
2118         // truncation of the method name.
2119         class_name += s1len; // null string
2120       }
2121       else {
2122         // lop off the extra characters from the front of the class name
2123         class_name += ((s1len + s2len + 2) - maxLen);
2124       }
2125     }
2126 
2127     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2128   }
2129 
2130   if (CICountOSR && is_osr) {
2131     _last_compile_type = osr_compile;
2132   } else {
2133     _last_compile_type = normal_compile;
2134   }
2135   _last_compile_level = comp_level;
2136 
2137   if (UsePerfData) {
2138     CompilerCounters* counters = thread->counters();
2139     counters->set_current_method(current_method);
2140     counters->set_compile_type((jlong)_last_compile_type);
2141   }
2142 }
2143 
2144 
2145 // ------------------------------------------------------------------
2146 // CompileBroker::push_jni_handle_block
2147 //
2148 // Push on a new block of JNI handles.
2149 void CompileBroker::push_jni_handle_block() {
2150   JavaThread* thread = JavaThread::current();
2151 
2152   // Allocate a new block for JNI handles.
2153   // Inlined code from jni_PushLocalFrame()
2154   JNIHandleBlock* java_handles = thread->active_handles();
2155   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2156   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2157   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2158   thread->set_active_handles(compile_handles);
2159 }
2160 
2161 
2162 // ------------------------------------------------------------------
2163 // CompileBroker::pop_jni_handle_block
2164 //
2165 // Pop off the current block of JNI handles.
2166 void CompileBroker::pop_jni_handle_block() {
2167   JavaThread* thread = JavaThread::current();
2168 
2169   // Release our JNI handle block
2170   JNIHandleBlock* compile_handles = thread->active_handles();
2171   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2172   thread->set_active_handles(java_handles);
2173   compile_handles->set_pop_frame_link(NULL);
2174   JNIHandleBlock::release_block(compile_handles, thread); // may block
2175 }
2176 
2177 
2178 // ------------------------------------------------------------------
2179 // CompileBroker::check_break_at
2180 //
2181 // Should the compilation break at the current compilation.
2182 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2183   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2184     return true;
2185   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2186     return true;
2187   } else {
2188     return (compile_id == CIBreakAt);
2189   }
2190 }
2191 
2192 // ------------------------------------------------------------------
2193 // CompileBroker::collect_statistics
2194 //
2195 // Collect statistics about the compilation.
2196 
2197 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2198   bool success = task->is_success();
2199   methodHandle method (thread, task->method());
2200   uint compile_id = task->compile_id();
2201   bool is_osr = (task->osr_bci() != standard_entry_bci);
2202   nmethod* code = task->code();
2203   CompilerCounters* counters = thread->counters();
2204 
2205   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2206   MutexLocker locker(CompileStatistics_lock);
2207 
2208   // _perf variables are production performance counters which are
2209   // updated regardless of the setting of the CITime and CITimeEach flags
2210   //
2211 
2212   // account all time, including bailouts and failures in this counter;
2213   // C1 and C2 counters are counting both successful and unsuccessful compiles
2214   _t_total_compilation.add(time);
2215 
2216   if (!success) {
2217     _total_bailout_count++;
2218     if (UsePerfData) {
2219       _perf_last_failed_method->set_value(counters->current_method());
2220       _perf_last_failed_type->set_value(counters->compile_type());
2221       _perf_total_bailout_count->inc();
2222     }
2223     _t_bailedout_compilation.add(time);
2224   } else if (code == NULL) {
2225     if (UsePerfData) {
2226       _perf_last_invalidated_method->set_value(counters->current_method());
2227       _perf_last_invalidated_type->set_value(counters->compile_type());
2228       _perf_total_invalidated_count->inc();
2229     }
2230     _total_invalidated_count++;
2231     _t_invalidated_compilation.add(time);
2232   } else {
2233     // Compilation succeeded
2234 
2235     // update compilation ticks - used by the implementation of
2236     // java.lang.management.CompilationMBean
2237     _perf_total_compilation->inc(time.ticks());
2238     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2239 
2240     if (CITime) {
2241       if (is_osr) {
2242         _t_osr_compilation.add(time);
2243         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2244       } else {
2245         _t_standard_compilation.add(time);
2246         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2247       }
2248     }
2249 
2250     if (UsePerfData) {
2251       // save the name of the last method compiled
2252       _perf_last_method->set_value(counters->current_method());
2253       _perf_last_compile_type->set_value(counters->compile_type());
2254       _perf_last_compile_size->set_value(method->code_size() +
2255                                          task->num_inlined_bytecodes());
2256       if (is_osr) {
2257         _perf_osr_compilation->inc(time.ticks());
2258         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2259       } else {
2260         _perf_standard_compilation->inc(time.ticks());
2261         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2262       }
2263     }
2264 
2265     if (CITimeEach) {
2266       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2267       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2268                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2269     }
2270 
2271     // Collect counts of successful compilations
2272     _sum_nmethod_size      += code->total_size();
2273     _sum_nmethod_code_size += code->insts_size();
2274     _total_compile_count++;
2275 
2276     if (UsePerfData) {
2277       _perf_sum_nmethod_size->inc(     code->total_size());
2278       _perf_sum_nmethod_code_size->inc(code->insts_size());
2279       _perf_total_compile_count->inc();
2280     }
2281 
2282     if (is_osr) {
2283       if (UsePerfData) _perf_total_osr_compile_count->inc();
2284       _total_osr_compile_count++;
2285     } else {
2286       if (UsePerfData) _perf_total_standard_compile_count->inc();
2287       _total_standard_compile_count++;
2288     }
2289   }
2290   // set the current method for the thread to null
2291   if (UsePerfData) counters->set_current_method("");
2292 }
2293 
2294 const char* CompileBroker::compiler_name(int comp_level) {
2295   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2296   if (comp == NULL) {
2297     return "no compiler";
2298   } else {
2299     return (comp->name());
2300   }
2301 }
2302 
2303 void CompileBroker::print_times() {
2304   tty->cr();
2305   tty->print_cr("Accumulated compiler times");
2306   tty->print_cr("----------------------------------------------------------");
2307                //0000000000111111111122222222223333333333444444444455555555556666666666
2308                //0123456789012345678901234567890123456789012345678901234567890123456789
2309   tty->print_cr("  Total compilation time   : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2310   tty->print_cr("    Standard compilation   : %7.3f s, Average : %2.3f s",
2311                 CompileBroker::_t_standard_compilation.seconds(),
2312                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2313   tty->print_cr("    Bailed out compilation : %7.3f s, Average : %2.3f s",
2314                 CompileBroker::_t_bailedout_compilation.seconds(),
2315                 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2316   tty->print_cr("    On stack replacement   : %7.3f s, Average : %2.3f s",
2317                 CompileBroker::_t_osr_compilation.seconds(),
2318                 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2319   tty->print_cr("    Invalidated            : %7.3f s, Average : %2.3f s",
2320                 CompileBroker::_t_invalidated_compilation.seconds(),
2321                 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2322 
2323   AbstractCompiler *comp = compiler(CompLevel_simple);
2324   if (comp != NULL) {
2325     tty->cr();
2326     comp->print_timers();
2327   }
2328   comp = compiler(CompLevel_full_optimization);
2329   if (comp != NULL) {
2330     tty->cr();
2331     comp->print_timers();
2332   }
2333   tty->cr();
2334   tty->print_cr("  Total compiled methods    : %8d methods", CompileBroker::_total_compile_count);
2335   tty->print_cr("    Standard compilation    : %8d methods", CompileBroker::_total_standard_compile_count);
2336   tty->print_cr("    On stack replacement    : %8d methods", CompileBroker::_total_osr_compile_count);
2337   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2338   tty->print_cr("  Total compiled bytecodes  : %8d bytes", tcb);
2339   tty->print_cr("    Standard compilation    : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2340   tty->print_cr("    On stack replacement    : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2341   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2342   tty->print_cr("  Average compilation speed : %8d bytes/s", bps);
2343   tty->cr();
2344   tty->print_cr("  nmethod code size         : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2345   tty->print_cr("  nmethod total size        : %8d bytes", CompileBroker::_sum_nmethod_size);
2346 }
2347 
2348 // Debugging output for failure
2349 void CompileBroker::print_last_compile() {
2350   if ( _last_compile_level != CompLevel_none &&
2351        compiler(_last_compile_level) != NULL &&
2352        _last_method_compiled != NULL &&
2353        _last_compile_type != no_compile) {
2354     if (_last_compile_type == osr_compile) {
2355       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2356                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2357     } else {
2358       tty->print_cr("Last parse:  %d+++(%d) %s",
2359                     _compilation_id, _last_compile_level, _last_method_compiled);
2360     }
2361   }
2362 }
2363 
2364 
2365 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2366 #ifndef PRODUCT
2367   st->print_cr("Compiler thread printing unimplemented.");
2368   st->cr();
2369 #endif
2370 }