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