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 "prims/whitebox.hpp"
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/atomic.inline.hpp"
  41 #include "runtime/compilationPolicy.hpp"
  42 #include "runtime/init.hpp"
  43 #include "runtime/interfaceSupport.hpp"
  44 #include "runtime/javaCalls.hpp"
  45 #include "runtime/os.hpp"
  46 #include "runtime/sharedRuntime.hpp"
  47 #include "runtime/sweeper.hpp"
  48 #include "trace/tracing.hpp"
  49 #include "utilities/dtrace.hpp"
  50 #include "utilities/events.hpp"
  51 #ifdef COMPILER1
  52 #include "c1/c1_Compiler.hpp"
  53 #endif
  54 #ifdef COMPILER2
  55 #include "opto/c2compiler.hpp"
  56 #endif
  57 #ifdef SHARK
  58 #include "shark/sharkCompiler.hpp"
  59 #endif
  60 
  61 #ifdef DTRACE_ENABLED
  62 
  63 // Only bother with this argument setup if dtrace is available
  64 
  65 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \
  66   {                                                                      \
  67     Symbol* klass_name = (method)->klass_name();                         \
  68     Symbol* name = (method)->name();                                     \
  69     Symbol* signature = (method)->signature();                           \
  70     HOTSPOT_METHOD_COMPILE_BEGIN(                                        \
  71       (char *) comp_name, strlen(comp_name),                             \
  72       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
  73       (char *) name->bytes(), name->utf8_length(),                       \
  74       (char *) signature->bytes(), signature->utf8_length());            \
  75   }
  76 
  77 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \
  78   {                                                                      \
  79     Symbol* klass_name = (method)->klass_name();                         \
  80     Symbol* name = (method)->name();                                     \
  81     Symbol* signature = (method)->signature();                           \
  82     HOTSPOT_METHOD_COMPILE_END(                                          \
  83       (char *) comp_name, strlen(comp_name),                             \
  84       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
  85       (char *) name->bytes(), name->utf8_length(),                       \
  86       (char *) signature->bytes(), signature->utf8_length(), (success)); \
  87   }
  88 
  89 #else //  ndef DTRACE_ENABLED
  90 
  91 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
  92 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
  93 
  94 #endif // ndef DTRACE_ENABLED
  95 
  96 bool CompileBroker::_initialized = false;
  97 volatile bool CompileBroker::_should_block = false;
  98 volatile jint CompileBroker::_print_compilation_warning = 0;
  99 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 100 
 101 // The installed compiler(s)
 102 AbstractCompiler* CompileBroker::_compilers[2];
 103 
 104 // These counters are used to assign an unique ID to each compilation.
 105 volatile jint CompileBroker::_compilation_id     = 0;
 106 volatile jint CompileBroker::_osr_compilation_id = 0;
 107 
 108 // Debugging information
 109 int  CompileBroker::_last_compile_type     = no_compile;
 110 int  CompileBroker::_last_compile_level    = CompLevel_none;
 111 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 112 
 113 // Performance counters
 114 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 115 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 116 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 117 
 118 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 119 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 120 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 121 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 122 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 123 
 124 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 125 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 126 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 127 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 128 
 129 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 130 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 131 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 132 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 133 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 134 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 135 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 136 
 137 // Timers and counters for generating statistics
 138 elapsedTimer CompileBroker::_t_total_compilation;
 139 elapsedTimer CompileBroker::_t_osr_compilation;
 140 elapsedTimer CompileBroker::_t_standard_compilation;
 141 elapsedTimer CompileBroker::_t_invalidated_compilation;
 142 elapsedTimer CompileBroker::_t_bailedout_compilation;
 143 
 144 int CompileBroker::_total_bailout_count          = 0;
 145 int CompileBroker::_total_invalidated_count      = 0;
 146 int CompileBroker::_total_compile_count          = 0;
 147 int CompileBroker::_total_osr_compile_count      = 0;
 148 int CompileBroker::_total_standard_compile_count = 0;
 149 
 150 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 151 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 152 int CompileBroker::_sum_nmethod_size             = 0;
 153 int CompileBroker::_sum_nmethod_code_size        = 0;
 154 
 155 long CompileBroker::_peak_compilation_time       = 0;
 156 
 157 CompileQueue* CompileBroker::_c2_compile_queue   = NULL;
 158 CompileQueue* CompileBroker::_c1_compile_queue   = NULL;
 159 
 160 
 161 class CompilationLog : public StringEventLog {
 162  public:
 163   CompilationLog() : StringEventLog("Compilation events") {
 164   }
 165 
 166   void log_compile(JavaThread* thread, CompileTask* task) {
 167     StringLogMessage lm;
 168     stringStream sstr = lm.stream();
 169     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 170     task->print_compilation(&sstr, NULL, true, false);
 171     log(thread, "%s", (const char*)lm);
 172   }
 173 
 174   void log_nmethod(JavaThread* thread, nmethod* nm) {
 175     log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 176         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 177         p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
 178   }
 179 
 180   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 181     StringLogMessage lm;
 182     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 183     if (retry_message != NULL) {
 184       lm.append(" (%s)", retry_message);
 185     }
 186     lm.print("\n");
 187     log(thread, "%s", (const char*)lm);
 188   }
 189 
 190   void log_metaspace_failure(const char* reason) {
 191     ResourceMark rm;
 192     StringLogMessage lm;
 193     lm.print("%4d   COMPILE PROFILING SKIPPED: %s", -1, reason);
 194     lm.print("\n");
 195     log(JavaThread::current(), "%s", (const char*)lm);
 196   }
 197 };
 198 
 199 static CompilationLog* _compilation_log = NULL;
 200 
 201 void compileBroker_init() {
 202   if (LogEvents) {
 203     _compilation_log = new CompilationLog();
 204   }
 205 }
 206 
 207 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 208   CompilerThread* thread = CompilerThread::current();
 209   thread->set_task(task);
 210   CompileLog*     log  = thread->log();
 211   if (log != NULL)  task->log_task_start(log);
 212 }
 213 
 214 CompileTaskWrapper::~CompileTaskWrapper() {
 215   CompilerThread* thread = CompilerThread::current();
 216   CompileTask* task = thread->task();
 217   CompileLog*  log  = thread->log();
 218   if (log != NULL)  task->log_task_done(log);
 219   thread->set_task(NULL);
 220   task->set_code_handle(NULL);
 221   thread->set_env(NULL);
 222   if (task->is_blocking()) {
 223     MutexLocker notifier(task->lock(), thread);
 224     task->mark_complete();
 225     // Notify the waiting thread that the compilation has completed.
 226     task->lock()->notify_all();
 227   } else {
 228     task->mark_complete();
 229 
 230     // By convention, the compiling thread is responsible for
 231     // recycling a non-blocking CompileTask.
 232     CompileTask::free(task);
 233   }
 234 }
 235 
 236 
 237 CompileTask*  CompileTask::_task_free_list = NULL;
 238 #ifdef ASSERT
 239 int CompileTask::_num_allocated_tasks = 0;
 240 #endif
 241 /**
 242  * Allocate a CompileTask, from the free list if possible.
 243  */
 244 CompileTask* CompileTask::allocate() {
 245   MutexLocker locker(CompileTaskAlloc_lock);
 246   CompileTask* task = NULL;
 247 
 248   if (_task_free_list != NULL) {
 249     task = _task_free_list;
 250     _task_free_list = task->next();
 251     task->set_next(NULL);
 252   } else {
 253     task = new CompileTask();
 254     DEBUG_ONLY(_num_allocated_tasks++;)
 255     assert (WhiteBoxAPI || WhiteBox::compilation_locked || _num_allocated_tasks < 10000, "Leaking compilation tasks?");
 256     task->set_next(NULL);
 257     task->set_is_free(true);
 258   }
 259   assert(task->is_free(), "Task must be free.");
 260   task->set_is_free(false);
 261   return task;
 262 }
 263 
 264 
 265 /**
 266  * Add a task to the free list.
 267  */
 268 void CompileTask::free(CompileTask* task) {
 269   MutexLocker locker(CompileTaskAlloc_lock);
 270   if (!task->is_free()) {
 271     task->set_code(NULL);
 272     assert(!task->lock()->is_locked(), "Should not be locked when freed");
 273     JNIHandles::destroy_global(task->_method_holder);
 274     JNIHandles::destroy_global(task->_hot_method_holder);
 275 
 276     task->set_is_free(true);
 277     task->set_next(_task_free_list);
 278     _task_free_list = task;
 279   }
 280 }
 281 
 282 void CompileTask::initialize(int compile_id,
 283                              methodHandle method,
 284                              int osr_bci,
 285                              int comp_level,
 286                              methodHandle hot_method,
 287                              int hot_count,
 288                              const char* comment,
 289                              bool is_blocking) {
 290   assert(!_lock->is_locked(), "bad locking");
 291 
 292   _compile_id = compile_id;
 293   _method = method();
 294   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
 295   _osr_bci = osr_bci;
 296   _is_blocking = is_blocking;
 297   _comp_level = comp_level;
 298   _num_inlined_bytecodes = 0;
 299 
 300   _is_complete = false;
 301   _is_success = false;
 302   _code_handle = NULL;
 303 
 304   _hot_method = NULL;
 305   _hot_method_holder = NULL;
 306   _hot_count = hot_count;
 307   _time_queued = 0;  // tidy
 308   _comment = comment;
 309   _failure_reason = NULL;
 310 
 311   if (LogCompilation) {
 312     _time_queued = os::elapsed_counter();
 313     if (hot_method.not_null()) {
 314       if (hot_method == method) {
 315         _hot_method = _method;
 316       } else {
 317         _hot_method = hot_method();
 318         // only add loader or mirror if different from _method_holder
 319         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
 320       }
 321     }
 322   }
 323 
 324   _next = NULL;
 325 }
 326 
 327 // ------------------------------------------------------------------
 328 // CompileTask::code/set_code
 329 nmethod* CompileTask::code() const {
 330   if (_code_handle == NULL)  return NULL;
 331   return _code_handle->code();
 332 }
 333 void CompileTask::set_code(nmethod* nm) {
 334   if (_code_handle == NULL && nm == NULL)  return;
 335   guarantee(_code_handle != NULL, "");
 336   _code_handle->set_code(nm);
 337   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 338 }
 339 
 340 void CompileTask::mark_on_stack() {
 341   // Mark these methods as something redefine classes cannot remove.
 342   _method->set_on_stack(true);
 343   if (_hot_method != NULL) {
 344     _hot_method->set_on_stack(true);
 345   }
 346 }
 347 
 348 // ------------------------------------------------------------------
 349 // CompileTask::print_line_on_error
 350 //
 351 // This function is called by fatal error handler when the thread
 352 // causing troubles is a compiler thread.
 353 //
 354 // Do not grab any lock, do not allocate memory.
 355 //
 356 // Otherwise it's the same as CompileTask::print_line()
 357 //
 358 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
 359   // print compiler name
 360   st->print("%s:", CompileBroker::compiler_name(comp_level()));
 361   print_compilation(st);
 362 }
 363 
 364 // ------------------------------------------------------------------
 365 // CompileTask::print_line
 366 void CompileTask::print_tty() {
 367   ttyLocker ttyl;  // keep the following output all in one block
 368   // print compiler name if requested
 369   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
 370     print_compilation(tty);
 371 }
 372 
 373 // ------------------------------------------------------------------
 374 // CompileTask::print_compilation_impl
 375 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
 376                                          bool is_osr_method, int osr_bci, bool is_blocking,
 377                                          const char* msg, bool short_form, bool cr) {
 378   if (!short_form) {
 379     st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp
 380   }
 381   st->print("%4d ", compile_id);    // print compilation number
 382 
 383   // For unloaded methods the transition to zombie occurs after the
 384   // method is cleared so it's impossible to report accurate
 385   // information for that case.
 386   bool is_synchronized = false;
 387   bool has_exception_handler = false;
 388   bool is_native = false;
 389   if (method != NULL) {
 390     is_synchronized       = method->is_synchronized();
 391     has_exception_handler = method->has_exception_handler();
 392     is_native             = method->is_native();
 393   }
 394   // method attributes
 395   const char compile_type   = is_osr_method                   ? '%' : ' ';
 396   const char sync_char      = is_synchronized                 ? 's' : ' ';
 397   const char exception_char = has_exception_handler           ? '!' : ' ';
 398   const char blocking_char  = is_blocking                     ? 'b' : ' ';
 399   const char native_char    = is_native                       ? 'n' : ' ';
 400 
 401   // print method attributes
 402   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
 403 
 404   if (TieredCompilation) {
 405     if (comp_level != -1)  st->print("%d ", comp_level);
 406     else                   st->print("- ");
 407   }
 408   st->print("     ");  // more indent
 409 
 410   if (method == NULL) {
 411     st->print("(method)");
 412   } else {
 413     method->print_short_name(st);
 414     if (is_osr_method) {
 415       st->print(" @ %d", osr_bci);
 416     }
 417     if (method->is_native())
 418       st->print(" (native)");
 419     else
 420       st->print(" (%d bytes)", method->code_size());
 421   }
 422 
 423   if (msg != NULL) {
 424     st->print("   %s", msg);
 425   }
 426   if (cr) {
 427     st->cr();
 428   }
 429 }
 430 
 431 // ------------------------------------------------------------------
 432 // CompileTask::print_inlining
 433 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
 434   //         1234567
 435   st->print("        ");     // print timestamp
 436   //         1234
 437   st->print("     ");        // print compilation number
 438 
 439   // method attributes
 440   if (method->is_loaded()) {
 441     const char sync_char      = method->is_synchronized()        ? 's' : ' ';
 442     const char exception_char = method->has_exception_handlers() ? '!' : ' ';
 443     const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';
 444 
 445     // print method attributes
 446     st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);
 447   } else {
 448     //         %s!bn
 449     st->print("      ");     // print method attributes
 450   }
 451 
 452   if (TieredCompilation) {
 453     st->print("  ");
 454   }
 455   st->print("     ");        // more indent
 456   st->print("    ");         // initial inlining indent
 457 
 458   for (int i = 0; i < inline_level; i++)  st->print("  ");
 459 
 460   st->print("@ %d  ", bci);  // print bci
 461   method->print_short_name(st);
 462   if (method->is_loaded())
 463     st->print(" (%d bytes)", method->code_size());
 464   else
 465     st->print(" (not loaded)");
 466 
 467   if (msg != NULL) {
 468     st->print("   %s", msg);
 469   }
 470   st->cr();
 471 }
 472 
 473 // ------------------------------------------------------------------
 474 // CompileTask::print_inline_indent
 475 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
 476   //         1234567
 477   st->print("        ");     // print timestamp
 478   //         1234
 479   st->print("     ");        // print compilation number
 480   //         %s!bn
 481   st->print("      ");       // print method attributes
 482   if (TieredCompilation) {
 483     st->print("  ");
 484   }
 485   st->print("     ");        // more indent
 486   st->print("    ");         // initial inlining indent
 487   for (int i = 0; i < inline_level; i++)  st->print("  ");
 488 }
 489 
 490 // ------------------------------------------------------------------
 491 // CompileTask::print_compilation
 492 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form, bool cr) {
 493   bool is_osr_method = osr_bci() != InvocationEntryBci;
 494   print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form, cr);
 495 }
 496 
 497 // ------------------------------------------------------------------
 498 // CompileTask::log_task
 499 void CompileTask::log_task(xmlStream* log) {
 500   Thread* thread = Thread::current();
 501   methodHandle method(thread, this->method());
 502   ResourceMark rm(thread);
 503 
 504   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
 505   log->print(" compile_id='%d'", _compile_id);
 506   if (_osr_bci != CompileBroker::standard_entry_bci) {
 507     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind
 508   } // else compile_kind='c2c'
 509   if (!method.is_null())  log->method(method);
 510   if (_osr_bci != CompileBroker::standard_entry_bci) {
 511     log->print(" osr_bci='%d'", _osr_bci);
 512   }
 513   if (_comp_level != CompLevel_highest_tier) {
 514     log->print(" level='%d'", _comp_level);
 515   }
 516   if (_is_blocking) {
 517     log->print(" blocking='1'");
 518   }
 519   log->stamp();
 520 }
 521 
 522 
 523 // ------------------------------------------------------------------
 524 // CompileTask::log_task_queued
 525 void CompileTask::log_task_queued() {
 526   Thread* thread = Thread::current();
 527   ttyLocker ttyl;
 528   ResourceMark rm(thread);
 529 
 530   xtty->begin_elem("task_queued");
 531   log_task(xtty);
 532   if (_comment != NULL) {
 533     xtty->print(" comment='%s'", _comment);
 534   }
 535   if (_hot_method != NULL) {
 536     methodHandle hot(thread, _hot_method);
 537     methodHandle method(thread, _method);
 538     if (hot() != method()) {
 539       xtty->method(hot);
 540     }
 541   }
 542   if (_hot_count != 0) {
 543     xtty->print(" hot_count='%d'", _hot_count);
 544   }
 545   xtty->end_elem();
 546 }
 547 
 548 
 549 // ------------------------------------------------------------------
 550 // CompileTask::log_task_start
 551 void CompileTask::log_task_start(CompileLog* log)   {
 552   log->begin_head("task");
 553   log_task(log);
 554   log->end_head();
 555 }
 556 
 557 
 558 // ------------------------------------------------------------------
 559 // CompileTask::log_task_done
 560 void CompileTask::log_task_done(CompileLog* log) {
 561   Thread* thread = Thread::current();
 562   methodHandle method(thread, this->method());
 563   ResourceMark rm(thread);
 564 
 565   if (!_is_success) {
 566     const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
 567     log->elem("failure reason='%s'", reason);
 568   }
 569 
 570   // <task_done ... stamp='1.234'>  </task>
 571   nmethod* nm = code();
 572   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
 573                   _is_success, nm == NULL ? 0 : nm->content_size(),
 574                   method->invocation_count());
 575   int bec = method->backedge_count();
 576   if (bec != 0)  log->print(" backedge_count='%d'", bec);
 577   // Note:  "_is_complete" is about to be set, but is not.
 578   if (_num_inlined_bytecodes != 0) {
 579     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
 580   }
 581   log->stamp();
 582   log->end_elem();
 583   log->tail("task");
 584   log->clear_identities();   // next task will have different CI
 585   if (log->unflushed_count() > 2000) {
 586     log->flush();
 587   }
 588   log->mark_file_end();
 589 }
 590 
 591 
 592 
 593 /**
 594  * Add a CompileTask to a CompileQueue.
 595  */
 596 void CompileQueue::add(CompileTask* task) {
 597   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 598 
 599   task->set_next(NULL);
 600   task->set_prev(NULL);
 601 
 602   if (_last == NULL) {
 603     // The compile queue is empty.
 604     assert(_first == NULL, "queue is empty");
 605     _first = task;
 606     _last = task;
 607   } else {
 608     // Append the task to the queue.
 609     assert(_last->next() == NULL, "not last");
 610     _last->set_next(task);
 611     task->set_prev(_last);
 612     _last = task;
 613   }
 614   ++_size;
 615 
 616   // Mark the method as being in the compile queue.
 617   task->method()->set_queued_for_compilation();
 618 
 619   if (CIPrintCompileQueue) {
 620     print_tty();
 621   }
 622 
 623   if (LogCompilation && xtty != NULL) {
 624     task->log_task_queued();
 625   }
 626 
 627   // Notify CompilerThreads that a task is available.
 628   MethodCompileQueue_lock->notify_all();
 629 }
 630 
 631 /**
 632  * Empties compilation queue by putting all compilation tasks onto
 633  * a freelist. Furthermore, the method wakes up all threads that are
 634  * waiting on a compilation task to finish. This can happen if background
 635  * compilation is disabled.
 636  */
 637 void CompileQueue::free_all() {
 638   MutexLocker mu(MethodCompileQueue_lock);
 639   CompileTask* next = _first;
 640 
 641   // Iterate over all tasks in the compile queue
 642   while (next != NULL) {
 643     CompileTask* current = next;
 644     next = current->next();
 645     {
 646       // Wake up thread that blocks on the compile task.
 647       MutexLocker ct_lock(current->lock());
 648       current->lock()->notify();
 649     }
 650     // Put the task back on the freelist.
 651     CompileTask::free(current);
 652   }
 653   _first = NULL;
 654 
 655   // Wake up all threads that block on the queue.
 656   MethodCompileQueue_lock->notify_all();
 657 }
 658 
 659 /**
 660  * Get the next CompileTask from a CompileQueue
 661  */
 662 CompileTask* CompileQueue::get() {
 663   MutexLocker locker(MethodCompileQueue_lock);
 664   // If _first is NULL we have no more compile jobs. There are two reasons for
 665   // having no compile jobs: First, we compiled everything we wanted. Second,
 666   // we ran out of code cache so compilation has been disabled. In the latter
 667   // case we perform code cache sweeps to free memory such that we can re-enable
 668   // compilation.
 669   while (_first == NULL) {
 670     // Exit loop if compilation is disabled forever
 671     if (CompileBroker::is_compilation_disabled_forever()) {
 672       return NULL;
 673     }
 674 
 675     // If there are no compilation tasks and we can compile new jobs
 676     // (i.e., there is enough free space in the code cache) there is
 677     // no need to invoke the sweeper. As a result, the hotness of methods
 678     // remains unchanged. This behavior is desired, since we want to keep
 679     // the stable state, i.e., we do not want to evict methods from the
 680     // code cache if it is unnecessary.
 681     // We need a timed wait here, since compiler threads can exit if compilation
 682     // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 683     // is not critical and we do not want idle compiler threads to wake up too often.
 684     MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 685   }
 686 
 687   if (CompileBroker::is_compilation_disabled_forever()) {
 688     return NULL;
 689   }
 690 
 691   CompileTask* task;
 692   {
 693     No_Safepoint_Verifier nsv;
 694     task = CompilationPolicy::policy()->select_task(this);
 695   }
 696   remove(task);
 697   purge_stale_tasks(); // may temporarily release MCQ lock
 698   return task;
 699 }
 700 
 701 // Clean & deallocate stale compile tasks.
 702 // Temporarily releases MethodCompileQueue lock.
 703 void CompileQueue::purge_stale_tasks() {
 704   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 705   if (_first_stale != NULL) {
 706     // Stale tasks are purged when MCQ lock is released,
 707     // but _first_stale updates are protected by MCQ lock.
 708     // Once task processing starts and MCQ lock is released,
 709     // other compiler threads can reuse _first_stale.
 710     CompileTask* head = _first_stale;
 711     _first_stale = NULL;
 712     {
 713       MutexUnlocker ul(MethodCompileQueue_lock);
 714       for (CompileTask* task = head; task != NULL; ) {
 715         CompileTask* next_task = task->next();
 716         CompileTaskWrapper ctw(task); // Frees the task
 717         task->set_failure_reason("stale task");
 718         task = next_task;
 719       }
 720     }
 721   }
 722 }
 723 
 724 void CompileQueue::remove(CompileTask* task) {
 725    assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 726   if (task->prev() != NULL) {
 727     task->prev()->set_next(task->next());
 728   } else {
 729     // max is the first element
 730     assert(task == _first, "Sanity");
 731     _first = task->next();
 732   }
 733 
 734   if (task->next() != NULL) {
 735     task->next()->set_prev(task->prev());
 736   } else {
 737     // max is the last element
 738     assert(task == _last, "Sanity");
 739     _last = task->prev();
 740   }
 741   --_size;
 742 }
 743 
 744 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 745   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 746   remove(task);
 747 
 748   // Enqueue the task for reclamation (should be done outside MCQ lock)
 749   task->set_next(_first_stale);
 750   task->set_prev(NULL);
 751   _first_stale = task;
 752 }
 753 
 754 // methods in the compile queue need to be marked as used on the stack
 755 // so that they don't get reclaimed by Redefine Classes
 756 void CompileQueue::mark_on_stack() {
 757   CompileTask* task = _first;
 758   while (task != NULL) {
 759     task->mark_on_stack();
 760     task = task->next();
 761   }
 762 }
 763 
 764 
 765 CompileQueue* CompileBroker::compile_queue(int comp_level) {
 766   if (is_c2_compile(comp_level)) return _c2_compile_queue;
 767   if (is_c1_compile(comp_level)) return _c1_compile_queue;
 768   return NULL;
 769 }
 770 
 771 
 772 void CompileBroker::print_compile_queues(outputStream* st) {
 773   MutexLocker locker(MethodCompileQueue_lock);
 774   if (_c1_compile_queue != NULL) {
 775     _c1_compile_queue->print(st);
 776   }
 777   if (_c2_compile_queue != NULL) {
 778     _c2_compile_queue->print(st);
 779   }
 780 }
 781 
 782 void CompileQueue::print(outputStream* st) {
 783   assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
 784   st->print_cr("Contents of %s", name());
 785   st->print_cr("----------------------------");
 786   CompileTask* task = _first;
 787   if (task == NULL) {
 788     st->print_cr("Empty");
 789   } else {
 790     while (task != NULL) {
 791       task->print_compilation(st, NULL, true, true);
 792       task = task->next();
 793     }
 794   }
 795   st->print_cr("----------------------------");
 796 }
 797 
 798 void CompileQueue::print_tty() {
 799   ttyLocker ttyl;
 800   print(tty);
 801 }
 802 
 803 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 804 
 805   _current_method[0] = '\0';
 806   _compile_type = CompileBroker::no_compile;
 807 
 808   if (UsePerfData) {
 809     ResourceMark rm;
 810 
 811     // create the thread instance name space string - don't create an
 812     // instance subspace if instance is -1 - keeps the adapterThread
 813     // counters  from having a ".0" namespace.
 814     const char* thread_i = (instance == -1) ? thread_name :
 815                       PerfDataManager::name_space(thread_name, instance);
 816 
 817 
 818     char* name = PerfDataManager::counter_name(thread_i, "method");
 819     _perf_current_method =
 820                PerfDataManager::create_string_variable(SUN_CI, name,
 821                                                        cmname_buffer_length,
 822                                                        _current_method, CHECK);
 823 
 824     name = PerfDataManager::counter_name(thread_i, "type");
 825     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 826                                                           PerfData::U_None,
 827                                                          (jlong)_compile_type,
 828                                                           CHECK);
 829 
 830     name = PerfDataManager::counter_name(thread_i, "time");
 831     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 832                                                  PerfData::U_Ticks, CHECK);
 833 
 834     name = PerfDataManager::counter_name(thread_i, "compiles");
 835     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 836                                                      PerfData::U_Events, CHECK);
 837   }
 838 }
 839 
 840 // ------------------------------------------------------------------
 841 // CompileBroker::compilation_init
 842 //
 843 // Initialize the Compilation object
 844 void CompileBroker::compilation_init() {
 845   _last_method_compiled[0] = '\0';
 846 
 847   // No need to initialize compilation system if we do not use it.
 848   if (!UseCompiler) {
 849     return;
 850   }
 851 #ifndef SHARK
 852   // Set the interface to the current compiler(s).
 853   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 854   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 855 #ifdef COMPILER1
 856   if (c1_count > 0) {
 857     _compilers[0] = new Compiler();
 858   }
 859 #endif // COMPILER1
 860 
 861 #ifdef COMPILER2
 862   if (c2_count > 0) {
 863     _compilers[1] = new C2Compiler();
 864   }
 865 #endif // COMPILER2
 866 
 867 #else // SHARK
 868   int c1_count = 0;
 869   int c2_count = 1;
 870 
 871   _compilers[1] = new SharkCompiler();
 872 #endif // SHARK
 873 
 874   // Start the compiler thread(s) and the sweeper thread
 875   init_compiler_sweeper_threads(c1_count, c2_count);
 876   // totalTime performance counter is always created as it is required
 877   // by the implementation of java.lang.management.CompilationMBean.
 878   {
 879     EXCEPTION_MARK;
 880     _perf_total_compilation =
 881                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 882                                                  PerfData::U_Ticks, CHECK);
 883   }
 884 
 885 
 886   if (UsePerfData) {
 887 
 888     EXCEPTION_MARK;
 889 
 890     // create the jvmstat performance counters
 891     _perf_osr_compilation =
 892                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 893                                                  PerfData::U_Ticks, CHECK);
 894 
 895     _perf_standard_compilation =
 896                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 897                                                  PerfData::U_Ticks, CHECK);
 898 
 899     _perf_total_bailout_count =
 900                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 901                                                  PerfData::U_Events, CHECK);
 902 
 903     _perf_total_invalidated_count =
 904                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 905                                                  PerfData::U_Events, CHECK);
 906 
 907     _perf_total_compile_count =
 908                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 909                                                  PerfData::U_Events, CHECK);
 910     _perf_total_osr_compile_count =
 911                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 912                                                  PerfData::U_Events, CHECK);
 913 
 914     _perf_total_standard_compile_count =
 915                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 916                                                  PerfData::U_Events, CHECK);
 917 
 918     _perf_sum_osr_bytes_compiled =
 919                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 920                                                  PerfData::U_Bytes, CHECK);
 921 
 922     _perf_sum_standard_bytes_compiled =
 923                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 924                                                  PerfData::U_Bytes, CHECK);
 925 
 926     _perf_sum_nmethod_size =
 927                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 928                                                  PerfData::U_Bytes, CHECK);
 929 
 930     _perf_sum_nmethod_code_size =
 931                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 932                                                  PerfData::U_Bytes, CHECK);
 933 
 934     _perf_last_method =
 935                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 936                                        CompilerCounters::cmname_buffer_length,
 937                                        "", CHECK);
 938 
 939     _perf_last_failed_method =
 940             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 941                                        CompilerCounters::cmname_buffer_length,
 942                                        "", CHECK);
 943 
 944     _perf_last_invalidated_method =
 945         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 946                                      CompilerCounters::cmname_buffer_length,
 947                                      "", CHECK);
 948 
 949     _perf_last_compile_type =
 950              PerfDataManager::create_variable(SUN_CI, "lastType",
 951                                               PerfData::U_None,
 952                                               (jlong)CompileBroker::no_compile,
 953                                               CHECK);
 954 
 955     _perf_last_compile_size =
 956              PerfDataManager::create_variable(SUN_CI, "lastSize",
 957                                               PerfData::U_Bytes,
 958                                               (jlong)CompileBroker::no_compile,
 959                                               CHECK);
 960 
 961 
 962     _perf_last_failed_type =
 963              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 964                                               PerfData::U_None,
 965                                               (jlong)CompileBroker::no_compile,
 966                                               CHECK);
 967 
 968     _perf_last_invalidated_type =
 969          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 970                                           PerfData::U_None,
 971                                           (jlong)CompileBroker::no_compile,
 972                                           CHECK);
 973   }
 974 
 975   _initialized = true;
 976 }
 977 
 978 
 979 JavaThread* CompileBroker::make_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
 980                                        AbstractCompiler* comp, bool compiler_thread, TRAPS) {
 981   JavaThread* thread = NULL;
 982   Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_0);
 983   instanceKlassHandle klass (THREAD, k);
 984   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 985   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 986 
 987   // Initialize thread_oop to put it into the system threadGroup
 988   Handle thread_group (THREAD,  Universe::system_thread_group());
 989   JavaValue result(T_VOID);
 990   JavaCalls::call_special(&result, thread_oop,
 991                        klass,
 992                        vmSymbols::object_initializer_name(),
 993                        vmSymbols::threadgroup_string_void_signature(),
 994                        thread_group,
 995                        string,
 996                        CHECK_0);
 997 
 998   {
 999     MutexLocker mu(Threads_lock, THREAD);
1000     if (compiler_thread) {
1001       thread = new CompilerThread(queue, counters);
1002     } else {
1003       thread = new CodeCacheSweeperThread();
1004     }
1005     // At this point the new CompilerThread data-races with this startup
1006     // thread (which I believe is the primoridal thread and NOT the VM
1007     // thread).  This means Java bytecodes being executed at startup can
1008     // queue compile jobs which will run at whatever default priority the
1009     // newly created CompilerThread runs at.
1010 
1011 
1012     // At this point it may be possible that no osthread was created for the
1013     // JavaThread due to lack of memory. We would have to throw an exception
1014     // in that case. However, since this must work and we do not allow
1015     // exceptions anyway, check and abort if this fails.
1016 
1017     if (thread == NULL || thread->osthread() == NULL) {
1018       vm_exit_during_initialization("java.lang.OutOfMemoryError",
1019                                     os::native_thread_creation_failed_msg());
1020     }
1021 
1022     java_lang_Thread::set_thread(thread_oop(), thread);
1023 
1024     // Note that this only sets the JavaThread _priority field, which by
1025     // definition is limited to Java priorities and not OS priorities.
1026     // The os-priority is set in the CompilerThread startup code itself
1027 
1028     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1029 
1030     // Note that we cannot call os::set_priority because it expects Java
1031     // priorities and we are *explicitly* using OS priorities so that it's
1032     // possible to set the compiler thread priority higher than any Java
1033     // thread.
1034 
1035     int native_prio = CompilerThreadPriority;
1036     if (native_prio == -1) {
1037       if (UseCriticalCompilerThreadPriority) {
1038         native_prio = os::java_to_os_priority[CriticalPriority];
1039       } else {
1040         native_prio = os::java_to_os_priority[NearMaxPriority];
1041       }
1042     }
1043     os::set_native_priority(thread, native_prio);
1044 
1045     java_lang_Thread::set_daemon(thread_oop());
1046 
1047     thread->set_threadObj(thread_oop());
1048     if (compiler_thread) {
1049       thread->as_CompilerThread()->set_compiler(comp);
1050     }
1051     Threads::add(thread);
1052     Thread::start(thread);
1053   }
1054 
1055   // Let go of Threads_lock before yielding
1056   os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1057 
1058   return thread;
1059 }
1060 
1061 
1062 void CompileBroker::init_compiler_sweeper_threads(int c1_compiler_count, int c2_compiler_count) {
1063   EXCEPTION_MARK;
1064 #if !defined(ZERO) && !defined(SHARK)
1065   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1066 #endif // !ZERO && !SHARK
1067   // Initialize the compilation queue
1068   if (c2_compiler_count > 0) {
1069     _c2_compile_queue  = new CompileQueue("C2 compile queue");
1070     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1071   }
1072   if (c1_compiler_count > 0) {
1073     _c1_compile_queue  = new CompileQueue("C1 compile queue");
1074     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1075   }
1076 
1077   int compiler_count = c1_compiler_count + c2_compiler_count;
1078 
1079   char name_buffer[256];
1080   const bool compiler_thread = true;
1081   for (int i = 0; i < c2_compiler_count; i++) {
1082     // Create a name for our thread.
1083     sprintf(name_buffer, "C2 CompilerThread%d", i);
1084     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1085     // Shark and C2
1086     make_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], compiler_thread, CHECK);
1087   }
1088 
1089   for (int i = c2_compiler_count; i < compiler_count; i++) {
1090     // Create a name for our thread.
1091     sprintf(name_buffer, "C1 CompilerThread%d", i);
1092     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1093     // C1
1094     make_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], compiler_thread, CHECK);
1095   }
1096 
1097   if (UsePerfData) {
1098     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1099   }
1100 
1101   if (MethodFlushing) {
1102     // Initialize the sweeper thread
1103     make_thread("Sweeper thread", NULL, NULL, NULL, false, CHECK);
1104   }
1105 }
1106 
1107 
1108 /**
1109  * Set the methods on the stack as on_stack so that redefine classes doesn't
1110  * reclaim them. This method is executed at a safepoint.
1111  */
1112 void CompileBroker::mark_on_stack() {
1113   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1114   // Since we are at a safepoint, we do not need a lock to access
1115   // the compile queues.
1116   if (_c2_compile_queue != NULL) {
1117     _c2_compile_queue->mark_on_stack();
1118   }
1119   if (_c1_compile_queue != NULL) {
1120     _c1_compile_queue->mark_on_stack();
1121   }
1122 }
1123 
1124 // ------------------------------------------------------------------
1125 // CompileBroker::compile_method
1126 //
1127 // Request compilation of a method.
1128 void CompileBroker::compile_method_base(methodHandle method,
1129                                         int osr_bci,
1130                                         int comp_level,
1131                                         methodHandle hot_method,
1132                                         int hot_count,
1133                                         const char* comment,
1134                                         Thread* thread) {
1135   // do nothing if compiler thread(s) is not available
1136   if (!_initialized) {
1137     return;
1138   }
1139 
1140   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1141   assert(method->method_holder()->oop_is_instance(),
1142          "sanity check");
1143   assert(!method->method_holder()->is_not_initialized(),
1144          "method holder must be initialized");
1145   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1146 
1147   if (CIPrintRequests) {
1148     tty->print("request: ");
1149     method->print_short_name(tty);
1150     if (osr_bci != InvocationEntryBci) {
1151       tty->print(" osr_bci: %d", osr_bci);
1152     }
1153     tty->print(" comment: %s count: %d", comment, hot_count);
1154     if (!hot_method.is_null()) {
1155       tty->print(" hot: ");
1156       if (hot_method() != method()) {
1157           hot_method->print_short_name(tty);
1158       } else {
1159         tty->print("yes");
1160       }
1161     }
1162     tty->cr();
1163   }
1164 
1165   // A request has been made for compilation.  Before we do any
1166   // real work, check to see if the method has been compiled
1167   // in the meantime with a definitive result.
1168   if (compilation_is_complete(method, osr_bci, comp_level)) {
1169     return;
1170   }
1171 
1172 #ifndef PRODUCT
1173   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1174     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1175       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1176       return;
1177     }
1178   }
1179 #endif
1180 
1181   // If this method is already in the compile queue, then
1182   // we do not block the current thread.
1183   if (compilation_is_in_queue(method)) {
1184     // We may want to decay our counter a bit here to prevent
1185     // multiple denied requests for compilation.  This is an
1186     // open compilation policy issue. Note: The other possibility,
1187     // in the case that this is a blocking compile request, is to have
1188     // all subsequent blocking requesters wait for completion of
1189     // ongoing compiles. Note that in this case we'll need a protocol
1190     // for freeing the associated compile tasks. [Or we could have
1191     // a single static monitor on which all these waiters sleep.]
1192     return;
1193   }
1194 
1195   // If the requesting thread is holding the pending list lock
1196   // then we just return. We can't risk blocking while holding
1197   // the pending list lock or a 3-way deadlock may occur
1198   // between the reference handler thread, a GC (instigated
1199   // by a compiler thread), and compiled method registration.
1200   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1201     return;
1202   }
1203 
1204   if (TieredCompilation) {
1205     // Tiered policy requires MethodCounters to exist before adding a method to
1206     // the queue. Create if we don't have them yet.
1207     method->get_method_counters(thread);
1208   }
1209 
1210   // Outputs from the following MutexLocker block:
1211   CompileTask* task     = NULL;
1212   bool         blocking = false;
1213   CompileQueue* queue  = compile_queue(comp_level);
1214 
1215   // Acquire our lock.
1216   {
1217     MutexLocker locker(MethodCompileQueue_lock, thread);
1218 
1219     // Make sure the method has not slipped into the queues since
1220     // last we checked; note that those checks were "fast bail-outs".
1221     // Here we need to be more careful, see 14012000 below.
1222     if (compilation_is_in_queue(method)) {
1223       return;
1224     }
1225 
1226     // We need to check again to see if the compilation has
1227     // completed.  A previous compilation may have registered
1228     // some result.
1229     if (compilation_is_complete(method, osr_bci, comp_level)) {
1230       return;
1231     }
1232 
1233     // We now know that this compilation is not pending, complete,
1234     // or prohibited.  Assign a compile_id to this compilation
1235     // and check to see if it is in our [Start..Stop) range.
1236     int compile_id = assign_compile_id(method, osr_bci);
1237     if (compile_id == 0) {
1238       // The compilation falls outside the allowed range.
1239       return;
1240     }
1241 
1242     // Should this thread wait for completion of the compile?
1243     blocking = is_compile_blocking();
1244 
1245     // We will enter the compilation in the queue.
1246     // 14012000: Note that this sets the queued_for_compile bits in
1247     // the target method. We can now reason that a method cannot be
1248     // queued for compilation more than once, as follows:
1249     // Before a thread queues a task for compilation, it first acquires
1250     // the compile queue lock, then checks if the method's queued bits
1251     // are set or it has already been compiled. Thus there can not be two
1252     // instances of a compilation task for the same method on the
1253     // compilation queue. Consider now the case where the compilation
1254     // thread has already removed a task for that method from the queue
1255     // and is in the midst of compiling it. In this case, the
1256     // queued_for_compile bits must be set in the method (and these
1257     // will be visible to the current thread, since the bits were set
1258     // under protection of the compile queue lock, which we hold now.
1259     // When the compilation completes, the compiler thread first sets
1260     // the compilation result and then clears the queued_for_compile
1261     // bits. Neither of these actions are protected by a barrier (or done
1262     // under the protection of a lock), so the only guarantee we have
1263     // (on machines with TSO (Total Store Order)) is that these values
1264     // will update in that order. As a result, the only combinations of
1265     // these bits that the current thread will see are, in temporal order:
1266     // <RESULT, QUEUE> :
1267     //     <0, 1> : in compile queue, but not yet compiled
1268     //     <1, 1> : compiled but queue bit not cleared
1269     //     <1, 0> : compiled and queue bit cleared
1270     // Because we first check the queue bits then check the result bits,
1271     // we are assured that we cannot introduce a duplicate task.
1272     // Note that if we did the tests in the reverse order (i.e. check
1273     // result then check queued bit), we could get the result bit before
1274     // the compilation completed, and the queue bit after the compilation
1275     // completed, and end up introducing a "duplicate" (redundant) task.
1276     // In that case, the compiler thread should first check if a method
1277     // has already been compiled before trying to compile it.
1278     // NOTE: in the event that there are multiple compiler threads and
1279     // there is de-optimization/recompilation, things will get hairy,
1280     // and in that case it's best to protect both the testing (here) of
1281     // these bits, and their updating (here and elsewhere) under a
1282     // common lock.
1283     task = create_compile_task(queue,
1284                                compile_id, method,
1285                                osr_bci, comp_level,
1286                                hot_method, hot_count, comment,
1287                                blocking);
1288   }
1289 
1290   if (blocking) {
1291     wait_for_completion(task);
1292   }
1293 }
1294 
1295 
1296 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1297                                        int comp_level,
1298                                        methodHandle hot_method, int hot_count,
1299                                        const char* comment, Thread* THREAD) {
1300   // make sure arguments make sense
1301   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1302   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1303   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1304   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1305   // allow any levels for WhiteBox
1306   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1307   // return quickly if possible
1308 
1309   // lock, make sure that the compilation
1310   // isn't prohibited in a straightforward way.
1311   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1312   if (comp == NULL || !comp->can_compile_method(method) ||
1313       compilation_is_prohibited(method, osr_bci, comp_level)) {
1314     return NULL;
1315   }
1316 
1317   if (osr_bci == InvocationEntryBci) {
1318     // standard compilation
1319     nmethod* method_code = method->code();
1320     if (method_code != NULL) {
1321       if (compilation_is_complete(method, osr_bci, comp_level)) {
1322         return method_code;
1323       }
1324     }
1325     if (method->is_not_compilable(comp_level)) {
1326       return NULL;
1327     }
1328   } else {
1329     // osr compilation
1330 #ifndef TIERED
1331     // seems like an assert of dubious value
1332     assert(comp_level == CompLevel_highest_tier,
1333            "all OSR compiles are assumed to be at a single compilation lavel");
1334 #endif // TIERED
1335     // We accept a higher level osr method
1336     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1337     if (nm != NULL) return nm;
1338     if (method->is_not_osr_compilable(comp_level)) return NULL;
1339   }
1340 
1341   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1342   // some prerequisites that are compiler specific
1343   if (comp->is_c2() || comp->is_shark()) {
1344     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1345     // Resolve all classes seen in the signature of the method
1346     // we are compiling.
1347     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1348   }
1349 
1350   // If the method is native, do the lookup in the thread requesting
1351   // the compilation. Native lookups can load code, which is not
1352   // permitted during compilation.
1353   //
1354   // Note: A native method implies non-osr compilation which is
1355   //       checked with an assertion at the entry of this method.
1356   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1357     bool in_base_library;
1358     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1359     if (HAS_PENDING_EXCEPTION) {
1360       // In case of an exception looking up the method, we just forget
1361       // about it. The interpreter will kick-in and throw the exception.
1362       method->set_not_compilable(); // implies is_not_osr_compilable()
1363       CLEAR_PENDING_EXCEPTION;
1364       return NULL;
1365     }
1366     assert(method->has_native_function(), "must have native code by now");
1367   }
1368 
1369   // RedefineClasses() has replaced this method; just return
1370   if (method->is_old()) {
1371     return NULL;
1372   }
1373 
1374   // JVMTI -- post_compile_event requires jmethod_id() that may require
1375   // a lock the compiling thread can not acquire. Prefetch it here.
1376   if (JvmtiExport::should_post_compiled_method_load()) {
1377     method->jmethod_id();
1378   }
1379 
1380   // do the compilation
1381   if (method->is_native()) {
1382     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1383       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1384       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1385       //
1386       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1387       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1388       AdapterHandlerLibrary::create_native_wrapper(method);
1389     } else {
1390       return NULL;
1391     }
1392   } else {
1393     // If the compiler is shut off due to code cache getting full
1394     // fail out now so blocking compiles dont hang the java thread
1395     if (!should_compile_new_jobs()) {
1396       CompilationPolicy::policy()->delay_compilation(method());
1397       return NULL;
1398     }
1399     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1400   }
1401 
1402   // return requested nmethod
1403   // We accept a higher level osr method
1404   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1405 }
1406 
1407 
1408 // ------------------------------------------------------------------
1409 // CompileBroker::compilation_is_complete
1410 //
1411 // See if compilation of this method is already complete.
1412 bool CompileBroker::compilation_is_complete(methodHandle method,
1413                                             int          osr_bci,
1414                                             int          comp_level) {
1415   bool is_osr = (osr_bci != standard_entry_bci);
1416   if (is_osr) {
1417     if (method->is_not_osr_compilable(comp_level)) {
1418       return true;
1419     } else {
1420       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1421       return (result != NULL);
1422     }
1423   } else {
1424     if (method->is_not_compilable(comp_level)) {
1425       return true;
1426     } else {
1427       nmethod* result = method->code();
1428       if (result == NULL) return false;
1429       return comp_level == result->comp_level();
1430     }
1431   }
1432 }
1433 
1434 
1435 /**
1436  * See if this compilation is already requested.
1437  *
1438  * Implementation note: there is only a single "is in queue" bit
1439  * for each method.  This means that the check below is overly
1440  * conservative in the sense that an osr compilation in the queue
1441  * will block a normal compilation from entering the queue (and vice
1442  * versa).  This can be remedied by a full queue search to disambiguate
1443  * cases.  If it is deemed profitable, this may be done.
1444  */
1445 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1446   return method->queued_for_compilation();
1447 }
1448 
1449 // ------------------------------------------------------------------
1450 // CompileBroker::compilation_is_prohibited
1451 //
1452 // See if this compilation is not allowed.
1453 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1454   bool is_native = method->is_native();
1455   // Some compilers may not support the compilation of natives.
1456   AbstractCompiler *comp = compiler(comp_level);
1457   if (is_native &&
1458       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1459     method->set_not_compilable_quietly(comp_level);
1460     return true;
1461   }
1462 
1463   bool is_osr = (osr_bci != standard_entry_bci);
1464   // Some compilers may not support on stack replacement.
1465   if (is_osr &&
1466       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1467     method->set_not_osr_compilable(comp_level);
1468     return true;
1469   }
1470 
1471   // The method may be explicitly excluded by the user.
1472   bool quietly;
1473   if (CompilerOracle::should_exclude(method, quietly)) {
1474     if (!quietly) {
1475       // This does not happen quietly...
1476       ResourceMark rm;
1477       tty->print("### Excluding %s:%s",
1478                  method->is_native() ? "generation of native wrapper" : "compile",
1479                  (method->is_static() ? " static" : ""));
1480       method->print_short_name(tty);
1481       tty->cr();
1482     }
1483     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1484   }
1485 
1486   return false;
1487 }
1488 
1489 /**
1490  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1491  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1492  * The function also allows to generate separate compilation IDs for OSR compilations.
1493  */
1494 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1495 #ifdef ASSERT
1496   bool is_osr = (osr_bci != standard_entry_bci);
1497   int id;
1498   if (method->is_native()) {
1499     assert(!is_osr, "can't be osr");
1500     // Adapters, native wrappers and method handle intrinsics
1501     // should be generated always.
1502     return Atomic::add(1, &_compilation_id);
1503   } else if (CICountOSR && is_osr) {
1504     id = Atomic::add(1, &_osr_compilation_id);
1505     if (CIStartOSR <= id && id < CIStopOSR) {
1506       return id;
1507     }
1508   } else {
1509     id = Atomic::add(1, &_compilation_id);
1510     if (CIStart <= id && id < CIStop) {
1511       return id;
1512     }
1513   }
1514 
1515   // Method was not in the appropriate compilation range.
1516   method->set_not_compilable_quietly();
1517   return 0;
1518 #else
1519   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1520   // only _compilation_id is incremented.
1521   return Atomic::add(1, &_compilation_id);
1522 #endif
1523 }
1524 
1525 /**
1526  * Should the current thread block until this compilation request
1527  * has been fulfilled?
1528  */
1529 bool CompileBroker::is_compile_blocking() {
1530   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1531   return !BackgroundCompilation;
1532 }
1533 
1534 
1535 // ------------------------------------------------------------------
1536 // CompileBroker::preload_classes
1537 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1538   // Move this code over from c1_Compiler.cpp
1539   ShouldNotReachHere();
1540 }
1541 
1542 
1543 // ------------------------------------------------------------------
1544 // CompileBroker::create_compile_task
1545 //
1546 // Create a CompileTask object representing the current request for
1547 // compilation.  Add this task to the queue.
1548 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1549                                               int           compile_id,
1550                                               methodHandle  method,
1551                                               int           osr_bci,
1552                                               int           comp_level,
1553                                               methodHandle  hot_method,
1554                                               int           hot_count,
1555                                               const char*   comment,
1556                                               bool          blocking) {
1557   CompileTask* new_task = CompileTask::allocate();
1558   new_task->initialize(compile_id, method, osr_bci, comp_level,
1559                        hot_method, hot_count, comment,
1560                        blocking);
1561   queue->add(new_task);
1562   return new_task;
1563 }
1564 
1565 
1566 /**
1567  *  Wait for the compilation task to complete.
1568  */
1569 void CompileBroker::wait_for_completion(CompileTask* task) {
1570   if (CIPrintCompileQueue) {
1571     ttyLocker ttyl;
1572     tty->print_cr("BLOCKING FOR COMPILE");
1573   }
1574 
1575   assert(task->is_blocking(), "can only wait on blocking task");
1576 
1577   JavaThread* thread = JavaThread::current();
1578   thread->set_blocked_on_compilation(true);
1579 
1580   methodHandle method(thread, task->method());
1581   {
1582     MutexLocker waiter(task->lock(), thread);
1583 
1584     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1585       task->lock()->wait();
1586     }
1587   }
1588 
1589   thread->set_blocked_on_compilation(false);
1590   if (is_compilation_disabled_forever()) {
1591     CompileTask::free(task);
1592     return;
1593   }
1594 
1595   // It is harmless to check this status without the lock, because
1596   // completion is a stable property (until the task object is recycled).
1597   assert(task->is_complete(), "Compilation should have completed");
1598   assert(task->code_handle() == NULL, "must be reset");
1599 
1600   // By convention, the waiter is responsible for recycling a
1601   // blocking CompileTask. Since there is only one waiter ever
1602   // waiting on a CompileTask, we know that no one else will
1603   // be using this CompileTask; we can free it.
1604   CompileTask::free(task);
1605 }
1606 
1607 /**
1608  * Initialize compiler thread(s) + compiler object(s). The postcondition
1609  * of this function is that the compiler runtimes are initialized and that
1610  * compiler threads can start compiling.
1611  */
1612 bool CompileBroker::init_compiler_runtime() {
1613   CompilerThread* thread = CompilerThread::current();
1614   AbstractCompiler* comp = thread->compiler();
1615   // Final sanity check - the compiler object must exist
1616   guarantee(comp != NULL, "Compiler object must exist");
1617 
1618   int system_dictionary_modification_counter;
1619   {
1620     MutexLocker locker(Compile_lock, thread);
1621     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1622   }
1623 
1624   {
1625     // Must switch to native to allocate ci_env
1626     ThreadToNativeFromVM ttn(thread);
1627     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1628     // Cache Jvmti state
1629     ci_env.cache_jvmti_state();
1630     // Cache DTrace flags
1631     ci_env.cache_dtrace_flags();
1632 
1633     // Switch back to VM state to do compiler initialization
1634     ThreadInVMfromNative tv(thread);
1635     ResetNoHandleMark rnhm;
1636 
1637 
1638     if (!comp->is_shark()) {
1639       // Perform per-thread and global initializations
1640       comp->initialize();
1641     }
1642   }
1643 
1644   if (comp->is_failed()) {
1645     disable_compilation_forever();
1646     // If compiler initialization failed, no compiler thread that is specific to a
1647     // particular compiler runtime will ever start to compile methods.
1648     shutdown_compiler_runtime(comp, thread);
1649     return false;
1650   }
1651 
1652   // C1 specific check
1653   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1654     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1655     return false;
1656   }
1657 
1658   return true;
1659 }
1660 
1661 /**
1662  * If C1 and/or C2 initialization failed, we shut down all compilation.
1663  * We do this to keep things simple. This can be changed if it ever turns
1664  * out to be a problem.
1665  */
1666 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1667   // Free buffer blob, if allocated
1668   if (thread->get_buffer_blob() != NULL) {
1669     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1670     CodeCache::free(thread->get_buffer_blob());
1671   }
1672 
1673   if (comp->should_perform_shutdown()) {
1674     // There are two reasons for shutting down the compiler
1675     // 1) compiler runtime initialization failed
1676     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1677     warning("%s initialization failed. Shutting down all compilers", comp->name());
1678 
1679     // Only one thread per compiler runtime object enters here
1680     // Set state to shut down
1681     comp->set_shut_down();
1682 
1683     // Delete all queued compilation tasks to make compiler threads exit faster.
1684     if (_c1_compile_queue != NULL) {
1685       _c1_compile_queue->free_all();
1686     }
1687 
1688     if (_c2_compile_queue != NULL) {
1689       _c2_compile_queue->free_all();
1690     }
1691 
1692     // Set flags so that we continue execution with using interpreter only.
1693     UseCompiler    = false;
1694     UseInterpreter = true;
1695 
1696     // We could delete compiler runtimes also. However, there are references to
1697     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1698     // fail. This can be done later if necessary.
1699   }
1700 }
1701 
1702 // ------------------------------------------------------------------
1703 // CompileBroker::compiler_thread_loop
1704 //
1705 // The main loop run by a CompilerThread.
1706 void CompileBroker::compiler_thread_loop() {
1707   CompilerThread* thread = CompilerThread::current();
1708   CompileQueue* queue = thread->queue();
1709   // For the thread that initializes the ciObjectFactory
1710   // this resource mark holds all the shared objects
1711   ResourceMark rm;
1712 
1713   // First thread to get here will initialize the compiler interface
1714 
1715   if (!ciObjectFactory::is_initialized()) {
1716     ASSERT_IN_VM;
1717     MutexLocker only_one (CompileThread_lock, thread);
1718     if (!ciObjectFactory::is_initialized()) {
1719       ciObjectFactory::initialize();
1720     }
1721   }
1722 
1723   // Open a log.
1724   if (LogCompilation) {
1725     init_compiler_thread_log();
1726   }
1727   CompileLog* log = thread->log();
1728   if (log != NULL) {
1729     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1730                     thread->name(),
1731                     os::current_thread_id(),
1732                     os::current_process_id());
1733     log->stamp();
1734     log->end_elem();
1735   }
1736 
1737   // If compiler thread/runtime initialization fails, exit the compiler thread
1738   if (!init_compiler_runtime()) {
1739     return;
1740   }
1741 
1742   // Poll for new compilation tasks as long as the JVM runs. Compilation
1743   // should only be disabled if something went wrong while initializing the
1744   // compiler runtimes. This, in turn, should not happen. The only known case
1745   // when compiler runtime initialization fails is if there is not enough free
1746   // space in the code cache to generate the necessary stubs, etc.
1747   while (!is_compilation_disabled_forever()) {
1748     // We need this HandleMark to avoid leaking VM handles.
1749     HandleMark hm(thread);
1750 
1751     CompileTask* task = queue->get();
1752     if (task == NULL) {
1753       continue;
1754     }
1755 
1756     // Give compiler threads an extra quanta.  They tend to be bursty and
1757     // this helps the compiler to finish up the job.
1758     if (CompilerThreadHintNoPreempt) {
1759       os::hint_no_preempt();
1760     }
1761 
1762     // trace per thread time and compile statistics
1763     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1764     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1765 
1766     // Assign the task to the current thread.  Mark this compilation
1767     // thread as active for the profiler.
1768     CompileTaskWrapper ctw(task);
1769     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1770     task->set_code_handle(&result_handle);
1771     methodHandle method(thread, task->method());
1772 
1773     // Never compile a method if breakpoints are present in it
1774     if (method()->number_of_breakpoints() == 0) {
1775       // Compile the method.
1776       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1777         invoke_compiler_on_method(task);
1778       } else {
1779         // After compilation is disabled, remove remaining methods from queue
1780         method->clear_queued_for_compilation();
1781         task->set_failure_reason("compilation is disabled");
1782       }
1783     }
1784   }
1785 
1786   // Shut down compiler runtime
1787   shutdown_compiler_runtime(thread->compiler(), thread);
1788 }
1789 
1790 // ------------------------------------------------------------------
1791 // CompileBroker::init_compiler_thread_log
1792 //
1793 // Set up state required by +LogCompilation.
1794 void CompileBroker::init_compiler_thread_log() {
1795     CompilerThread* thread = CompilerThread::current();
1796     char  file_name[4*K];
1797     FILE* fp = NULL;
1798     intx thread_id = os::current_thread_id();
1799     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1800       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1801       if (dir == NULL) {
1802         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1803                      thread_id, os::current_process_id());
1804       } else {
1805         jio_snprintf(file_name, sizeof(file_name),
1806                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1807                      os::file_separator(), thread_id, os::current_process_id());
1808       }
1809 
1810       fp = fopen(file_name, "wt");
1811       if (fp != NULL) {
1812         if (LogCompilation && Verbose) {
1813           tty->print_cr("Opening compilation log %s", file_name);
1814         }
1815         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1816         thread->init_log(log);
1817 
1818         if (xtty != NULL) {
1819           ttyLocker ttyl;
1820           // Record any per thread log files
1821           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1822         }
1823         return;
1824       }
1825     }
1826     warning("Cannot open log file: %s", file_name);
1827 }
1828 
1829 void CompileBroker::log_metaspace_failure() {
1830   const char* message = "some methods may not be compiled because metaspace "
1831                         "is out of memory";
1832   if (_compilation_log != NULL) {
1833     _compilation_log->log_metaspace_failure(message);
1834   }
1835   if (PrintCompilation) {
1836     tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1837   }
1838 }
1839 
1840 
1841 // ------------------------------------------------------------------
1842 // CompileBroker::set_should_block
1843 //
1844 // Set _should_block.
1845 // Call this from the VM, with Threads_lock held and a safepoint requested.
1846 void CompileBroker::set_should_block() {
1847   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1848   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1849 #ifndef PRODUCT
1850   if (PrintCompilation && (Verbose || WizardMode))
1851     tty->print_cr("notifying compiler thread pool to block");
1852 #endif
1853   _should_block = true;
1854 }
1855 
1856 // ------------------------------------------------------------------
1857 // CompileBroker::maybe_block
1858 //
1859 // Call this from the compiler at convenient points, to poll for _should_block.
1860 void CompileBroker::maybe_block() {
1861   if (_should_block) {
1862 #ifndef PRODUCT
1863     if (PrintCompilation && (Verbose || WizardMode))
1864       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1865 #endif
1866     ThreadInVMfromNative tivfn(JavaThread::current());
1867   }
1868 }
1869 
1870 // wrapper for CodeCache::print_summary()
1871 static void codecache_print(bool detailed)
1872 {
1873   ResourceMark rm;
1874   stringStream s;
1875   // Dump code cache  into a buffer before locking the tty,
1876   {
1877     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1878     CodeCache::print_summary(&s, detailed);
1879   }
1880   ttyLocker ttyl;
1881   tty->print("%s", s.as_string());
1882 }
1883 
1884 // ------------------------------------------------------------------
1885 // CompileBroker::invoke_compiler_on_method
1886 //
1887 // Compile a method.
1888 //
1889 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1890   if (PrintCompilation) {
1891     ResourceMark rm;
1892     task->print_tty();
1893   }
1894   elapsedTimer time;
1895 
1896   CompilerThread* thread = CompilerThread::current();
1897   ResourceMark rm(thread);
1898 
1899   if (LogEvents) {
1900     _compilation_log->log_compile(thread, task);
1901   }
1902 
1903   // Common flags.
1904   uint compile_id = task->compile_id();
1905   int osr_bci = task->osr_bci();
1906   bool is_osr = (osr_bci != standard_entry_bci);
1907   bool should_log = (thread->log() != NULL);
1908   bool should_break = false;
1909   int task_level = task->comp_level();
1910   {
1911     // create the handle inside it's own block so it can't
1912     // accidentally be referenced once the thread transitions to
1913     // native.  The NoHandleMark before the transition should catch
1914     // any cases where this occurs in the future.
1915     methodHandle method(thread, task->method());
1916     should_break = check_break_at(method, compile_id, is_osr);
1917     if (should_log && !CompilerOracle::should_log(method)) {
1918       should_log = false;
1919     }
1920     assert(!method->is_native(), "no longer compile natives");
1921 
1922     // Save information about this method in case of failure.
1923     set_last_compile(thread, method, is_osr, task_level);
1924 
1925     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1926   }
1927 
1928   // Allocate a new set of JNI handles.
1929   push_jni_handle_block();
1930   Method* target_handle = task->method();
1931   int compilable = ciEnv::MethodCompilable;
1932   {
1933     int system_dictionary_modification_counter;
1934     {
1935       MutexLocker locker(Compile_lock, thread);
1936       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1937     }
1938 
1939     NoHandleMark  nhm;
1940     ThreadToNativeFromVM ttn(thread);
1941 
1942     ciEnv ci_env(task, system_dictionary_modification_counter);
1943     if (should_break) {
1944       ci_env.set_break_at_compile(true);
1945     }
1946     if (should_log) {
1947       ci_env.set_log(thread->log());
1948     }
1949     assert(thread->env() == &ci_env, "set by ci_env");
1950     // The thread-env() field is cleared in ~CompileTaskWrapper.
1951 
1952     // Cache Jvmti state
1953     ci_env.cache_jvmti_state();
1954 
1955     // Cache DTrace flags
1956     ci_env.cache_dtrace_flags();
1957 
1958     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1959 
1960     TraceTime t1("compilation", &time);
1961     EventCompilation event;
1962 
1963     AbstractCompiler *comp = compiler(task_level);
1964     if (comp == NULL) {
1965       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1966     } else {
1967       if (WhiteBoxAPI && WhiteBox::compilation_locked) {
1968         MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
1969         while (WhiteBox::compilation_locked) {
1970           locker.wait(Mutex::_no_safepoint_check_flag);
1971         }
1972       }
1973       comp->compile_method(&ci_env, target, osr_bci);
1974     }
1975 
1976     if (!ci_env.failing() && task->code() == NULL) {
1977       //assert(false, "compiler should always document failure");
1978       // The compiler elected, without comment, not to register a result.
1979       // Do not attempt further compilations of this method.
1980       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1981     }
1982 
1983     // Copy this bit to the enclosing block:
1984     compilable = ci_env.compilable();
1985 
1986     if (ci_env.failing()) {
1987       task->set_failure_reason(ci_env.failure_reason());
1988       ci_env.report_failure(ci_env.failure_reason());
1989       const char* retry_message = ci_env.retry_message();
1990       if (_compilation_log != NULL) {
1991         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1992       }
1993       if (PrintCompilation) {
1994         FormatBufferResource msg = retry_message != NULL ?
1995             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1996             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1997         task->print_compilation(tty, msg);
1998       }
1999     } else {
2000       task->mark_success();
2001       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2002       if (_compilation_log != NULL) {
2003         nmethod* code = task->code();
2004         if (code != NULL) {
2005           _compilation_log->log_nmethod(thread, code);
2006         }
2007       }
2008     }
2009     // simulate crash during compilation
2010     assert(task->compile_id() != CICrashAt, "just as planned");
2011     if (event.should_commit()) {
2012       event.set_method(target->get_Method());
2013       event.set_compileID(compile_id);
2014       event.set_compileLevel(task->comp_level());
2015       event.set_succeded(task->is_success());
2016       event.set_isOsr(is_osr);
2017       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2018       event.set_inlinedBytes(task->num_inlined_bytecodes());
2019       event.commit();
2020     }
2021   }
2022   pop_jni_handle_block();
2023 
2024   methodHandle method(thread, task->method());
2025 
2026   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2027 
2028   collect_statistics(thread, time, task);
2029 
2030   if (PrintCompilation && PrintCompilation2) {
2031     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
2032     tty->print("%4d ", compile_id);    // print compilation number
2033     tty->print("%s ", (is_osr ? "%" : " "));
2034     if (task->code() != NULL) {
2035       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2036     }
2037     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2038   }
2039 
2040   if (PrintCodeCacheOnCompilation)
2041     codecache_print(/* detailed= */ false);
2042 
2043   // Disable compilation, if required.
2044   switch (compilable) {
2045   case ciEnv::MethodCompilable_never:
2046     if (is_osr)
2047       method->set_not_osr_compilable_quietly();
2048     else
2049       method->set_not_compilable_quietly();
2050     break;
2051   case ciEnv::MethodCompilable_not_at_tier:
2052     if (is_osr)
2053       method->set_not_osr_compilable_quietly(task_level);
2054     else
2055       method->set_not_compilable_quietly(task_level);
2056     break;
2057   }
2058 
2059   // Note that the queued_for_compilation bits are cleared without
2060   // protection of a mutex. [They were set by the requester thread,
2061   // when adding the task to the compile queue -- at which time the
2062   // compile queue lock was held. Subsequently, we acquired the compile
2063   // queue lock to get this task off the compile queue; thus (to belabour
2064   // the point somewhat) our clearing of the bits must be occurring
2065   // only after the setting of the bits. See also 14012000 above.
2066   method->clear_queued_for_compilation();
2067 
2068 #ifdef ASSERT
2069   if (CollectedHeap::fired_fake_oom()) {
2070     // The current compile received a fake OOM during compilation so
2071     // go ahead and exit the VM since the test apparently succeeded
2072     tty->print_cr("*** Shutting down VM after successful fake OOM");
2073     vm_exit(0);
2074   }
2075 #endif
2076 }
2077 
2078 /**
2079  * The CodeCache is full. Print warning and disable compilation.
2080  * Schedule code cache cleaning so compilation can continue later.
2081  * This function needs to be called only from CodeCache::allocate(),
2082  * since we currently handle a full code cache uniformly.
2083  */
2084 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2085   UseInterpreter = true;
2086   if (UseCompiler || AlwaysCompileLoopMethods ) {
2087     if (xtty != NULL) {
2088       ResourceMark rm;
2089       stringStream s;
2090       // Dump code cache state into a buffer before locking the tty,
2091       // because log_state() will use locks causing lock conflicts.
2092       CodeCache::log_state(&s);
2093       // Lock to prevent tearing
2094       ttyLocker ttyl;
2095       xtty->begin_elem("code_cache_full");
2096       xtty->print("%s", s.as_string());
2097       xtty->stamp();
2098       xtty->end_elem();
2099     }
2100 
2101 #ifndef PRODUCT
2102     if (CompileTheWorld || ExitOnFullCodeCache) {
2103       codecache_print(/* detailed= */ true);
2104       before_exit(JavaThread::current());
2105       exit_globals(); // will delete tty
2106       vm_direct_exit(CompileTheWorld ? 0 : 1);
2107     }
2108 #endif
2109     if (UseCodeCacheFlushing) {
2110       // Since code cache is full, immediately stop new compiles
2111       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2112         NMethodSweeper::log_sweep("disable_compiler");
2113       }
2114     } else {
2115       disable_compilation_forever();
2116     }
2117 
2118     CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2119   }
2120 }
2121 
2122 // ------------------------------------------------------------------
2123 // CompileBroker::set_last_compile
2124 //
2125 // Record this compilation for debugging purposes.
2126 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2127   ResourceMark rm;
2128   char* method_name = method->name()->as_C_string();
2129   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2130   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2131   char current_method[CompilerCounters::cmname_buffer_length];
2132   size_t maxLen = CompilerCounters::cmname_buffer_length;
2133 
2134   if (UsePerfData) {
2135     const char* class_name = method->method_holder()->name()->as_C_string();
2136 
2137     size_t s1len = strlen(class_name);
2138     size_t s2len = strlen(method_name);
2139 
2140     // check if we need to truncate the string
2141     if (s1len + s2len + 2 > maxLen) {
2142 
2143       // the strategy is to lop off the leading characters of the
2144       // class name and the trailing characters of the method name.
2145 
2146       if (s2len + 2 > maxLen) {
2147         // lop of the entire class name string, let snprintf handle
2148         // truncation of the method name.
2149         class_name += s1len; // null string
2150       }
2151       else {
2152         // lop off the extra characters from the front of the class name
2153         class_name += ((s1len + s2len + 2) - maxLen);
2154       }
2155     }
2156 
2157     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2158   }
2159 
2160   if (CICountOSR && is_osr) {
2161     _last_compile_type = osr_compile;
2162   } else {
2163     _last_compile_type = normal_compile;
2164   }
2165   _last_compile_level = comp_level;
2166 
2167   if (UsePerfData) {
2168     CompilerCounters* counters = thread->counters();
2169     counters->set_current_method(current_method);
2170     counters->set_compile_type((jlong)_last_compile_type);
2171   }
2172 }
2173 
2174 
2175 // ------------------------------------------------------------------
2176 // CompileBroker::push_jni_handle_block
2177 //
2178 // Push on a new block of JNI handles.
2179 void CompileBroker::push_jni_handle_block() {
2180   JavaThread* thread = JavaThread::current();
2181 
2182   // Allocate a new block for JNI handles.
2183   // Inlined code from jni_PushLocalFrame()
2184   JNIHandleBlock* java_handles = thread->active_handles();
2185   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2186   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2187   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2188   thread->set_active_handles(compile_handles);
2189 }
2190 
2191 
2192 // ------------------------------------------------------------------
2193 // CompileBroker::pop_jni_handle_block
2194 //
2195 // Pop off the current block of JNI handles.
2196 void CompileBroker::pop_jni_handle_block() {
2197   JavaThread* thread = JavaThread::current();
2198 
2199   // Release our JNI handle block
2200   JNIHandleBlock* compile_handles = thread->active_handles();
2201   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2202   thread->set_active_handles(java_handles);
2203   compile_handles->set_pop_frame_link(NULL);
2204   JNIHandleBlock::release_block(compile_handles, thread); // may block
2205 }
2206 
2207 
2208 // ------------------------------------------------------------------
2209 // CompileBroker::check_break_at
2210 //
2211 // Should the compilation break at the current compilation.
2212 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2213   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2214     return true;
2215   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2216     return true;
2217   } else {
2218     return (compile_id == CIBreakAt);
2219   }
2220 }
2221 
2222 // ------------------------------------------------------------------
2223 // CompileBroker::collect_statistics
2224 //
2225 // Collect statistics about the compilation.
2226 
2227 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2228   bool success = task->is_success();
2229   methodHandle method (thread, task->method());
2230   uint compile_id = task->compile_id();
2231   bool is_osr = (task->osr_bci() != standard_entry_bci);
2232   nmethod* code = task->code();
2233   CompilerCounters* counters = thread->counters();
2234 
2235   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2236   MutexLocker locker(CompileStatistics_lock);
2237 
2238   // _perf variables are production performance counters which are
2239   // updated regardless of the setting of the CITime and CITimeEach flags
2240   //
2241 
2242   // account all time, including bailouts and failures in this counter;
2243   // C1 and C2 counters are counting both successful and unsuccessful compiles
2244   _t_total_compilation.add(time);
2245 
2246   if (!success) {
2247     _total_bailout_count++;
2248     if (UsePerfData) {
2249       _perf_last_failed_method->set_value(counters->current_method());
2250       _perf_last_failed_type->set_value(counters->compile_type());
2251       _perf_total_bailout_count->inc();
2252     }
2253     _t_bailedout_compilation.add(time);
2254   } else if (code == NULL) {
2255     if (UsePerfData) {
2256       _perf_last_invalidated_method->set_value(counters->current_method());
2257       _perf_last_invalidated_type->set_value(counters->compile_type());
2258       _perf_total_invalidated_count->inc();
2259     }
2260     _total_invalidated_count++;
2261     _t_invalidated_compilation.add(time);
2262   } else {
2263     // Compilation succeeded
2264 
2265     // update compilation ticks - used by the implementation of
2266     // java.lang.management.CompilationMBean
2267     _perf_total_compilation->inc(time.ticks());
2268     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2269 
2270     if (CITime) {
2271       if (is_osr) {
2272         _t_osr_compilation.add(time);
2273         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2274       } else {
2275         _t_standard_compilation.add(time);
2276         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2277       }
2278     }
2279 
2280     if (UsePerfData) {
2281       // save the name of the last method compiled
2282       _perf_last_method->set_value(counters->current_method());
2283       _perf_last_compile_type->set_value(counters->compile_type());
2284       _perf_last_compile_size->set_value(method->code_size() +
2285                                          task->num_inlined_bytecodes());
2286       if (is_osr) {
2287         _perf_osr_compilation->inc(time.ticks());
2288         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2289       } else {
2290         _perf_standard_compilation->inc(time.ticks());
2291         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2292       }
2293     }
2294 
2295     if (CITimeEach) {
2296       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2297       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2298                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2299     }
2300 
2301     // Collect counts of successful compilations
2302     _sum_nmethod_size      += code->total_size();
2303     _sum_nmethod_code_size += code->insts_size();
2304     _total_compile_count++;
2305 
2306     if (UsePerfData) {
2307       _perf_sum_nmethod_size->inc(     code->total_size());
2308       _perf_sum_nmethod_code_size->inc(code->insts_size());
2309       _perf_total_compile_count->inc();
2310     }
2311 
2312     if (is_osr) {
2313       if (UsePerfData) _perf_total_osr_compile_count->inc();
2314       _total_osr_compile_count++;
2315     } else {
2316       if (UsePerfData) _perf_total_standard_compile_count->inc();
2317       _total_standard_compile_count++;
2318     }
2319   }
2320   // set the current method for the thread to null
2321   if (UsePerfData) counters->set_current_method("");
2322 }
2323 
2324 const char* CompileBroker::compiler_name(int comp_level) {
2325   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2326   if (comp == NULL) {
2327     return "no compiler";
2328   } else {
2329     return (comp->name());
2330   }
2331 }
2332 
2333 void CompileBroker::print_times() {
2334   tty->cr();
2335   tty->print_cr("Accumulated compiler times");
2336   tty->print_cr("----------------------------------------------------------");
2337                //0000000000111111111122222222223333333333444444444455555555556666666666
2338                //0123456789012345678901234567890123456789012345678901234567890123456789
2339   tty->print_cr("  Total compilation time   : %7.3f s", CompileBroker::_t_total_compilation.seconds());
2340   tty->print_cr("    Standard compilation   : %7.3f s, Average : %2.3f s",
2341                 CompileBroker::_t_standard_compilation.seconds(),
2342                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2343   tty->print_cr("    Bailed out compilation : %7.3f s, Average : %2.3f s",
2344                 CompileBroker::_t_bailedout_compilation.seconds(),
2345                 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2346   tty->print_cr("    On stack replacement   : %7.3f s, Average : %2.3f s",
2347                 CompileBroker::_t_osr_compilation.seconds(),
2348                 CompileBroker::_t_osr_compilation.seconds() / CompileBroker::_total_osr_compile_count);
2349   tty->print_cr("    Invalidated            : %7.3f s, Average : %2.3f s",
2350                 CompileBroker::_t_invalidated_compilation.seconds(),
2351                 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2352 
2353   AbstractCompiler *comp = compiler(CompLevel_simple);
2354   if (comp != NULL) {
2355     tty->cr();
2356     comp->print_timers();
2357   }
2358   comp = compiler(CompLevel_full_optimization);
2359   if (comp != NULL) {
2360     tty->cr();
2361     comp->print_timers();
2362   }
2363   tty->cr();
2364   tty->print_cr("  Total compiled methods    : %8d methods", CompileBroker::_total_compile_count);
2365   tty->print_cr("    Standard compilation    : %8d methods", CompileBroker::_total_standard_compile_count);
2366   tty->print_cr("    On stack replacement    : %8d methods", CompileBroker::_total_osr_compile_count);
2367   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2368   tty->print_cr("  Total compiled bytecodes  : %8d bytes", tcb);
2369   tty->print_cr("    Standard compilation    : %8d bytes", CompileBroker::_sum_standard_bytes_compiled);
2370   tty->print_cr("    On stack replacement    : %8d bytes", CompileBroker::_sum_osr_bytes_compiled);
2371   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2372   tty->print_cr("  Average compilation speed : %8d bytes/s", bps);
2373   tty->cr();
2374   tty->print_cr("  nmethod code size         : %8d bytes", CompileBroker::_sum_nmethod_code_size);
2375   tty->print_cr("  nmethod total size        : %8d bytes", CompileBroker::_sum_nmethod_size);
2376 }
2377 
2378 // Debugging output for failure
2379 void CompileBroker::print_last_compile() {
2380   if ( _last_compile_level != CompLevel_none &&
2381        compiler(_last_compile_level) != NULL &&
2382        _last_method_compiled != NULL &&
2383        _last_compile_type != no_compile) {
2384     if (_last_compile_type == osr_compile) {
2385       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2386                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2387     } else {
2388       tty->print_cr("Last parse:  %d+++(%d) %s",
2389                     _compilation_id, _last_compile_level, _last_method_compiled);
2390     }
2391   }
2392 }
2393 
2394 
2395 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2396 #ifndef PRODUCT
2397   st->print_cr("Compiler thread printing unimplemented.");
2398   st->cr();
2399 #endif
2400 }