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