1 /*
   2  * Copyright (c) 1999, 2012, 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 "utilities/dtrace.hpp"
  47 #include "utilities/events.hpp"
  48 #ifdef COMPILER1
  49 #include "c1/c1_Compiler.hpp"
  50 #endif
  51 #ifdef COMPILER2
  52 #include "opto/c2compiler.hpp"
  53 #endif
  54 #ifdef SHARK
  55 #include "shark/sharkCompiler.hpp"
  56 #endif
  57 
  58 #ifdef DTRACE_ENABLED
  59 
  60 // Only bother with this argument setup if dtrace is available
  61 
  62 #ifndef USDT2
  63 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
  64   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
  65 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
  66   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
  67 
  68 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)              \
  69   {                                                                      \
  70     char* comp_name = (char*)(compiler)->name();                         \
  71     Symbol* klass_name = (method)->klass_name();                         \
  72     Symbol* name = (method)->name();                                     \
  73     Symbol* signature = (method)->signature();                           \
  74     HS_DTRACE_PROBE8(hotspot, method__compile__begin,                    \
  75       comp_name, strlen(comp_name),                                      \
  76       klass_name->bytes(), klass_name->utf8_length(),                    \
  77       name->bytes(), name->utf8_length(),                                \
  78       signature->bytes(), signature->utf8_length());                     \
  79   }
  80 
  81 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)       \
  82   {                                                                      \
  83     char* comp_name = (char*)(compiler)->name();                         \
  84     Symbol* klass_name = (method)->klass_name();                         \
  85     Symbol* name = (method)->name();                                     \
  86     Symbol* signature = (method)->signature();                           \
  87     HS_DTRACE_PROBE9(hotspot, method__compile__end,                      \
  88       comp_name, strlen(comp_name),                                      \
  89       klass_name->bytes(), klass_name->utf8_length(),                    \
  90       name->bytes(), name->utf8_length(),                                \
  91       signature->bytes(), signature->utf8_length(), (success));          \
  92   }
  93 
  94 #else /* USDT2 */
  95 
  96 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)              \
  97   {                                                                      \
  98     char* comp_name = (char*)(compiler)->name();                         \
  99     Symbol* klass_name = (method)->klass_name();                         \
 100     Symbol* name = (method)->name();                                     \
 101     Symbol* signature = (method)->signature();                           \
 102     HOTSPOT_METHOD_COMPILE_BEGIN(                                       \
 103       comp_name, strlen(comp_name),                                      \
 104       (char *) klass_name->bytes(), klass_name->utf8_length(),          \
 105       (char *) name->bytes(), name->utf8_length(),                       \
 106       (char *) signature->bytes(), signature->utf8_length());            \
 107   }
 108 
 109 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)       \
 110   {                                                                      \
 111     char* comp_name = (char*)(compiler)->name();                         \
 112     Symbol* klass_name = (method)->klass_name();                         \
 113     Symbol* name = (method)->name();                                     \
 114     Symbol* signature = (method)->signature();                           \
 115     HOTSPOT_METHOD_COMPILE_END(                                          \
 116       comp_name, strlen(comp_name),                                      \
 117       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
 118       (char *) name->bytes(), name->utf8_length(),                       \
 119       (char *) signature->bytes(), signature->utf8_length(), (success)); \
 120   }
 121 #endif /* USDT2 */
 122 
 123 #else //  ndef DTRACE_ENABLED
 124 
 125 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)
 126 #define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)
 127 
 128 #endif // ndef DTRACE_ENABLED
 129 
 130 bool CompileBroker::_initialized = false;
 131 volatile bool CompileBroker::_should_block = false;
 132 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 133 
 134 // The installed compiler(s)
 135 AbstractCompiler* CompileBroker::_compilers[2];
 136 
 137 // These counters are used for assigning id's to each compilation
 138 uint CompileBroker::_compilation_id        = 0;
 139 uint CompileBroker::_osr_compilation_id    = 0;
 140 
 141 // Debugging information
 142 int  CompileBroker::_last_compile_type     = no_compile;
 143 int  CompileBroker::_last_compile_level    = CompLevel_none;
 144 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 145 
 146 // Performance counters
 147 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 148 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 149 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 150 
 151 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 152 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 153 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 154 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 155 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 156 
 157 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 158 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 159 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 160 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 161 
 162 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 163 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 164 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 165 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 166 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 167 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 168 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 169 
 170 // Timers and counters for generating statistics
 171 elapsedTimer CompileBroker::_t_total_compilation;
 172 elapsedTimer CompileBroker::_t_osr_compilation;
 173 elapsedTimer CompileBroker::_t_standard_compilation;
 174 
 175 int CompileBroker::_total_bailout_count          = 0;
 176 int CompileBroker::_total_invalidated_count      = 0;
 177 int CompileBroker::_total_compile_count          = 0;
 178 int CompileBroker::_total_osr_compile_count      = 0;
 179 int CompileBroker::_total_standard_compile_count = 0;
 180 
 181 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 182 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 183 int CompileBroker::_sum_nmethod_size             = 0;
 184 int CompileBroker::_sum_nmethod_code_size        = 0;
 185 
 186 CompileQueue* CompileBroker::_c2_method_queue   = NULL;
 187 CompileQueue* CompileBroker::_c1_method_queue   = NULL;
 188 CompileTask*  CompileBroker::_task_free_list = NULL;
 189 
 190 GrowableArray<CompilerThread*>* CompileBroker::_method_threads = NULL;
 191 
 192 
 193 class CompilationLog : public StringEventLog {
 194  public:
 195   CompilationLog() : StringEventLog("Compilation events") {
 196   }
 197 
 198   void log_compile(JavaThread* thread, CompileTask* task) {
 199     StringLogMessage lm;
 200     stringStream sstr = lm.stream();
 201     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 202     task->print_compilation(&sstr, NULL, true);
 203     log(thread, "%s", (const char*)lm);
 204   }
 205 
 206   void log_nmethod(JavaThread* thread, nmethod* nm) {
 207     log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 208         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 209         nm, nm->code_begin(), nm->code_end());
 210   }
 211 
 212   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 213     StringLogMessage lm;
 214     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 215     if (retry_message != NULL) {
 216       lm.append(" (%s)", retry_message);
 217     }
 218     lm.print("\n");
 219     log(thread, "%s", (const char*)lm);
 220   }
 221 };
 222 
 223 static CompilationLog* _compilation_log = NULL;
 224 
 225 void compileBroker_init() {
 226   if (LogEvents) {
 227     _compilation_log = new CompilationLog();
 228   }
 229 }
 230 
 231 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 232   CompilerThread* thread = CompilerThread::current();
 233   thread->set_task(task);
 234   CompileLog*     log  = thread->log();
 235   if (log != NULL)  task->log_task_start(log);
 236 }
 237 
 238 CompileTaskWrapper::~CompileTaskWrapper() {
 239   CompilerThread* thread = CompilerThread::current();
 240   CompileTask* task = thread->task();
 241   CompileLog*  log  = thread->log();
 242   if (log != NULL)  task->log_task_done(log);
 243   thread->set_task(NULL);
 244   task->set_code_handle(NULL);
 245   thread->set_env(NULL);
 246   if (task->is_blocking()) {
 247     MutexLocker notifier(task->lock(), thread);
 248     task->mark_complete();
 249     // Notify the waiting thread that the compilation has completed.
 250     task->lock()->notify_all();
 251   } else {
 252     task->mark_complete();
 253 
 254     // By convention, the compiling thread is responsible for
 255     // recycling a non-blocking CompileTask.
 256     CompileBroker::free_task(task);
 257   }
 258 }
 259 
 260 
 261 // ------------------------------------------------------------------
 262 // CompileTask::initialize
 263 void CompileTask::initialize(int compile_id,
 264                              methodHandle method,
 265                              int osr_bci,
 266                              int comp_level,
 267                              methodHandle hot_method,
 268                              int hot_count,
 269                              const char* comment,
 270                              bool is_blocking) {
 271   assert(!_lock->is_locked(), "bad locking");
 272 
 273   _compile_id = compile_id;
 274   _method = method();
 275   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
 276   _osr_bci = osr_bci;
 277   _is_blocking = is_blocking;
 278   _comp_level = comp_level;
 279   _num_inlined_bytecodes = 0;
 280 
 281   _is_complete = false;
 282   _is_success = false;
 283   _code_handle = NULL;
 284 
 285   _hot_method = NULL;
 286   _hot_method_holder = NULL;
 287   _hot_count = hot_count;
 288   _time_queued = 0;  // tidy
 289   _comment = comment;
 290 
 291   if (LogCompilation) {
 292     _time_queued = os::elapsed_counter();
 293     if (hot_method.not_null()) {
 294       if (hot_method == method) {
 295         _hot_method = _method;
 296       } else {
 297         _hot_method = hot_method();
 298         // only add loader or mirror if different from _method_holder
 299         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
 300       }
 301     }
 302   }
 303 
 304   _next = NULL;
 305 }
 306 
 307 // ------------------------------------------------------------------
 308 // CompileTask::code/set_code
 309 nmethod* CompileTask::code() const {
 310   if (_code_handle == NULL)  return NULL;
 311   return _code_handle->code();
 312 }
 313 void CompileTask::set_code(nmethod* nm) {
 314   if (_code_handle == NULL && nm == NULL)  return;
 315   guarantee(_code_handle != NULL, "");
 316   _code_handle->set_code(nm);
 317   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 318 }
 319 
 320 // ------------------------------------------------------------------
 321 // CompileTask::free
 322 void CompileTask::free() {
 323   set_code(NULL);
 324   assert(!_lock->is_locked(), "Should not be locked when freed");
 325   JNIHandles::destroy_global(_method_holder);
 326   JNIHandles::destroy_global(_hot_method_holder);
 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(comp_level())->name());
 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(comp_level())->name());
 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 // CompileQueue::add
 593 //
 594 // Add a CompileTask to a CompileQueue
 595 void CompileQueue::add(CompileTask* task) {
 596   assert(lock()->owned_by_self(), "must own lock");
 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   if (CIPrintCompileQueue) {
 619     print();
 620   }
 621 
 622   if (LogCompilation && xtty != NULL) {
 623     task->log_task_queued();
 624   }
 625 
 626   // Notify CompilerThreads that a task is available.
 627   lock()->notify_all();
 628 }
 629 
 630 // ------------------------------------------------------------------
 631 // CompileQueue::get
 632 //
 633 // Get the next CompileTask from a CompileQueue
 634 CompileTask* CompileQueue::get() {
 635   NMethodSweeper::possibly_sweep();
 636 
 637   MutexLocker locker(lock());
 638   // Wait for an available CompileTask.
 639   while (_first == NULL) {
 640     // There is no work to be done right now.  Wait.
 641     if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() || CodeCache::needs_flushing())) {
 642       // During the emergency sweeping periods, wake up and sweep occasionally
 643       bool timedout = lock()->wait(!Mutex::_no_safepoint_check_flag, NmethodSweepCheckInterval*1000);
 644       if (timedout) {
 645         MutexUnlocker ul(lock());
 646         // When otherwise not busy, run nmethod sweeping
 647         NMethodSweeper::possibly_sweep();
 648       }
 649     } else {
 650       // During normal operation no need to wake up on timer
 651       lock()->wait();
 652     }
 653   }
 654   CompileTask* task = CompilationPolicy::policy()->select_task(this);
 655   remove(task);
 656   return task;
 657 }
 658 
 659 void CompileQueue::remove(CompileTask* task)
 660 {
 661    assert(lock()->owned_by_self(), "must own lock");
 662   if (task->prev() != NULL) {
 663     task->prev()->set_next(task->next());
 664   } else {
 665     // max is the first element
 666     assert(task == _first, "Sanity");
 667     _first = task->next();
 668   }
 669 
 670   if (task->next() != NULL) {
 671     task->next()->set_prev(task->prev());
 672   } else {
 673     // max is the last element
 674     assert(task == _last, "Sanity");
 675     _last = task->prev();
 676   }
 677   --_size;
 678 }
 679 
 680 // methods in the compile queue need to be marked as used on the stack
 681 // so that they don't get reclaimed by Redefine Classes
 682 void CompileQueue::mark_on_stack() {
 683   CompileTask* task = _first;
 684   while (task != NULL) {
 685     task->mark_on_stack();
 686     task = task->next();
 687   }
 688 }
 689 
 690 // ------------------------------------------------------------------
 691 // CompileQueue::print
 692 void CompileQueue::print() {
 693   tty->print_cr("Contents of %s", name());
 694   tty->print_cr("----------------------");
 695   CompileTask* task = _first;
 696   while (task != NULL) {
 697     task->print_line();
 698     task = task->next();
 699   }
 700   tty->print_cr("----------------------");
 701 }
 702 
 703 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 704 
 705   _current_method[0] = '\0';
 706   _compile_type = CompileBroker::no_compile;
 707 
 708   if (UsePerfData) {
 709     ResourceMark rm;
 710 
 711     // create the thread instance name space string - don't create an
 712     // instance subspace if instance is -1 - keeps the adapterThread
 713     // counters  from having a ".0" namespace.
 714     const char* thread_i = (instance == -1) ? thread_name :
 715                       PerfDataManager::name_space(thread_name, instance);
 716 
 717 
 718     char* name = PerfDataManager::counter_name(thread_i, "method");
 719     _perf_current_method =
 720                PerfDataManager::create_string_variable(SUN_CI, name,
 721                                                        cmname_buffer_length,
 722                                                        _current_method, CHECK);
 723 
 724     name = PerfDataManager::counter_name(thread_i, "type");
 725     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 726                                                           PerfData::U_None,
 727                                                          (jlong)_compile_type,
 728                                                           CHECK);
 729 
 730     name = PerfDataManager::counter_name(thread_i, "time");
 731     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 732                                                  PerfData::U_Ticks, CHECK);
 733 
 734     name = PerfDataManager::counter_name(thread_i, "compiles");
 735     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 736                                                      PerfData::U_Events, CHECK);
 737   }
 738 }
 739 
 740 // ------------------------------------------------------------------
 741 // CompileBroker::compilation_init
 742 //
 743 // Initialize the Compilation object
 744 void CompileBroker::compilation_init() {
 745   _last_method_compiled[0] = '\0';
 746 
 747 #ifndef SHARK
 748   // Set the interface to the current compiler(s).
 749   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 750   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 751 #ifdef COMPILER1
 752   if (c1_count > 0) {
 753     _compilers[0] = new Compiler();
 754   }
 755 #endif // COMPILER1
 756 
 757 #ifdef COMPILER2
 758   if (c2_count > 0) {
 759     _compilers[1] = new C2Compiler();
 760   }
 761 #endif // COMPILER2
 762 
 763 #else // SHARK
 764   int c1_count = 0;
 765   int c2_count = 1;
 766 
 767   _compilers[1] = new SharkCompiler();
 768 #endif // SHARK
 769 
 770   // Initialize the CompileTask free list
 771   _task_free_list = NULL;
 772 
 773   // Start the CompilerThreads
 774   init_compiler_threads(c1_count, c2_count);
 775   // totalTime performance counter is always created as it is required
 776   // by the implementation of java.lang.management.CompilationMBean.
 777   {
 778     EXCEPTION_MARK;
 779     _perf_total_compilation =
 780                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 781                                                  PerfData::U_Ticks, CHECK);
 782   }
 783 
 784 
 785   if (UsePerfData) {
 786 
 787     EXCEPTION_MARK;
 788 
 789     // create the jvmstat performance counters
 790     _perf_osr_compilation =
 791                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 792                                                  PerfData::U_Ticks, CHECK);
 793 
 794     _perf_standard_compilation =
 795                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 796                                                  PerfData::U_Ticks, CHECK);
 797 
 798     _perf_total_bailout_count =
 799                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 800                                                  PerfData::U_Events, CHECK);
 801 
 802     _perf_total_invalidated_count =
 803                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 804                                                  PerfData::U_Events, CHECK);
 805 
 806     _perf_total_compile_count =
 807                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 808                                                  PerfData::U_Events, CHECK);
 809     _perf_total_osr_compile_count =
 810                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 811                                                  PerfData::U_Events, CHECK);
 812 
 813     _perf_total_standard_compile_count =
 814                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 815                                                  PerfData::U_Events, CHECK);
 816 
 817     _perf_sum_osr_bytes_compiled =
 818                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 819                                                  PerfData::U_Bytes, CHECK);
 820 
 821     _perf_sum_standard_bytes_compiled =
 822                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 823                                                  PerfData::U_Bytes, CHECK);
 824 
 825     _perf_sum_nmethod_size =
 826                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 827                                                  PerfData::U_Bytes, CHECK);
 828 
 829     _perf_sum_nmethod_code_size =
 830                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 831                                                  PerfData::U_Bytes, CHECK);
 832 
 833     _perf_last_method =
 834                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 835                                        CompilerCounters::cmname_buffer_length,
 836                                        "", CHECK);
 837 
 838     _perf_last_failed_method =
 839             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 840                                        CompilerCounters::cmname_buffer_length,
 841                                        "", CHECK);
 842 
 843     _perf_last_invalidated_method =
 844         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 845                                      CompilerCounters::cmname_buffer_length,
 846                                      "", CHECK);
 847 
 848     _perf_last_compile_type =
 849              PerfDataManager::create_variable(SUN_CI, "lastType",
 850                                               PerfData::U_None,
 851                                               (jlong)CompileBroker::no_compile,
 852                                               CHECK);
 853 
 854     _perf_last_compile_size =
 855              PerfDataManager::create_variable(SUN_CI, "lastSize",
 856                                               PerfData::U_Bytes,
 857                                               (jlong)CompileBroker::no_compile,
 858                                               CHECK);
 859 
 860 
 861     _perf_last_failed_type =
 862              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 863                                               PerfData::U_None,
 864                                               (jlong)CompileBroker::no_compile,
 865                                               CHECK);
 866 
 867     _perf_last_invalidated_type =
 868          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 869                                           PerfData::U_None,
 870                                           (jlong)CompileBroker::no_compile,
 871                                           CHECK);
 872   }
 873 
 874   _initialized = true;
 875 }
 876 
 877 
 878 
 879 // ------------------------------------------------------------------
 880 // CompileBroker::make_compiler_thread
 881 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, TRAPS) {
 882   CompilerThread* compiler_thread = NULL;
 883 
 884   Klass* k =
 885     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
 886                                       true, CHECK_0);
 887   instanceKlassHandle klass (THREAD, k);
 888   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 889   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 890 
 891   // Initialize thread_oop to put it into the system threadGroup
 892   Handle thread_group (THREAD,  Universe::system_thread_group());
 893   JavaValue result(T_VOID);
 894   JavaCalls::call_special(&result, thread_oop,
 895                        klass,
 896                        vmSymbols::object_initializer_name(),
 897                        vmSymbols::threadgroup_string_void_signature(),
 898                        thread_group,
 899                        string,
 900                        CHECK_0);
 901 
 902   {
 903     MutexLocker mu(Threads_lock, THREAD);
 904     compiler_thread = new CompilerThread(queue, counters);
 905     // At this point the new CompilerThread data-races with this startup
 906     // thread (which I believe is the primoridal thread and NOT the VM
 907     // thread).  This means Java bytecodes being executed at startup can
 908     // queue compile jobs which will run at whatever default priority the
 909     // newly created CompilerThread runs at.
 910 
 911 
 912     // At this point it may be possible that no osthread was created for the
 913     // JavaThread due to lack of memory. We would have to throw an exception
 914     // in that case. However, since this must work and we do not allow
 915     // exceptions anyway, check and abort if this fails.
 916 
 917     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
 918       vm_exit_during_initialization("java.lang.OutOfMemoryError",
 919                                     "unable to create new native thread");
 920     }
 921 
 922     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
 923 
 924     // Note that this only sets the JavaThread _priority field, which by
 925     // definition is limited to Java priorities and not OS priorities.
 926     // The os-priority is set in the CompilerThread startup code itself
 927 
 928     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
 929 
 930     // Note that we cannot call os::set_priority because it expects Java
 931     // priorities and we are *explicitly* using OS priorities so that it's
 932     // possible to set the compiler thread priority higher than any Java
 933     // thread.
 934 
 935     int native_prio = CompilerThreadPriority;
 936     if (native_prio == -1) {
 937       if (UseCriticalCompilerThreadPriority) {
 938         native_prio = os::java_to_os_priority[CriticalPriority];
 939       } else {
 940         native_prio = os::java_to_os_priority[NearMaxPriority];
 941       }
 942     }
 943     os::set_native_priority(compiler_thread, native_prio);
 944 
 945     java_lang_Thread::set_daemon(thread_oop());
 946 
 947     compiler_thread->set_threadObj(thread_oop());
 948     Threads::add(compiler_thread);
 949     Thread::start(compiler_thread);
 950   }
 951 
 952   // Let go of Threads_lock before yielding
 953   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 954 
 955   return compiler_thread;
 956 }
 957 
 958 
 959 // ------------------------------------------------------------------
 960 // CompileBroker::init_compiler_threads
 961 //
 962 // Initialize the compilation queue
 963 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
 964   EXCEPTION_MARK;
 965 #if !defined(ZERO) && !defined(SHARK)
 966   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
 967 #endif // !ZERO && !SHARK
 968   if (c2_compiler_count > 0) {
 969     _c2_method_queue  = new CompileQueue("C2MethodQueue",  MethodCompileQueue_lock);
 970   }
 971   if (c1_compiler_count > 0) {
 972     _c1_method_queue  = new CompileQueue("C1MethodQueue",  MethodCompileQueue_lock);
 973   }
 974 
 975   int compiler_count = c1_compiler_count + c2_compiler_count;
 976 
 977   _method_threads =
 978     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
 979 
 980   char name_buffer[256];
 981   for (int i = 0; i < c2_compiler_count; i++) {
 982     // Create a name for our thread.
 983     sprintf(name_buffer, "C2 CompilerThread%d", i);
 984     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 985     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
 986     _method_threads->append(new_thread);
 987   }
 988 
 989   for (int i = c2_compiler_count; i < compiler_count; i++) {
 990     // Create a name for our thread.
 991     sprintf(name_buffer, "C1 CompilerThread%d", i);
 992     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 993     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
 994     _method_threads->append(new_thread);
 995   }
 996 
 997   if (UsePerfData) {
 998     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
 999                                      compiler_count, CHECK);
1000   }
1001 }
1002 
1003 
1004 // Set the methods on the stack as on_stack so that redefine classes doesn't
1005 // reclaim them
1006 void CompileBroker::mark_on_stack() {
1007   if (_c2_method_queue != NULL) {
1008     _c2_method_queue->mark_on_stack();
1009   }
1010   if (_c1_method_queue != NULL) {
1011     _c1_method_queue->mark_on_stack();
1012   }
1013 }
1014 
1015 // ------------------------------------------------------------------
1016 // CompileBroker::is_idle
1017 bool CompileBroker::is_idle() {
1018   if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
1019     return false;
1020   } else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
1021     return false;
1022   } else {
1023     int num_threads = _method_threads->length();
1024     for (int i=0; i<num_threads; i++) {
1025       if (_method_threads->at(i)->task() != NULL) {
1026         return false;
1027       }
1028     }
1029 
1030     // No pending or active compilations.
1031     return true;
1032   }
1033 }
1034 
1035 
1036 // ------------------------------------------------------------------
1037 // CompileBroker::compile_method
1038 //
1039 // Request compilation of a method.
1040 void CompileBroker::compile_method_base(methodHandle method,
1041                                         int osr_bci,
1042                                         int comp_level,
1043                                         methodHandle hot_method,
1044                                         int hot_count,
1045                                         const char* comment,
1046                                         Thread* thread) {
1047   // do nothing if compiler thread(s) is not available
1048   if (!_initialized ) {
1049     return;
1050   }
1051 
1052   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1053   assert(method->method_holder()->oop_is_instance(),
1054          "sanity check");
1055   assert(!method->method_holder()->is_not_initialized(),
1056          "method holder must be initialized");
1057   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1058 
1059   if (CIPrintRequests) {
1060     tty->print("request: ");
1061     method->print_short_name(tty);
1062     if (osr_bci != InvocationEntryBci) {
1063       tty->print(" osr_bci: %d", osr_bci);
1064     }
1065     tty->print(" comment: %s count: %d", comment, hot_count);
1066     if (!hot_method.is_null()) {
1067       tty->print(" hot: ");
1068       if (hot_method() != method()) {
1069           hot_method->print_short_name(tty);
1070       } else {
1071         tty->print("yes");
1072       }
1073     }
1074     tty->cr();
1075   }
1076 
1077   // A request has been made for compilation.  Before we do any
1078   // real work, check to see if the method has been compiled
1079   // in the meantime with a definitive result.
1080   if (compilation_is_complete(method, osr_bci, comp_level)) {
1081     return;
1082   }
1083 
1084 #ifndef PRODUCT
1085   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1086     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1087       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1088       return;
1089     }
1090   }
1091 #endif
1092 
1093   // If this method is already in the compile queue, then
1094   // we do not block the current thread.
1095   if (compilation_is_in_queue(method, osr_bci)) {
1096     // We may want to decay our counter a bit here to prevent
1097     // multiple denied requests for compilation.  This is an
1098     // open compilation policy issue. Note: The other possibility,
1099     // in the case that this is a blocking compile request, is to have
1100     // all subsequent blocking requesters wait for completion of
1101     // ongoing compiles. Note that in this case we'll need a protocol
1102     // for freeing the associated compile tasks. [Or we could have
1103     // a single static monitor on which all these waiters sleep.]
1104     return;
1105   }
1106 
1107   // If the requesting thread is holding the pending list lock
1108   // then we just return. We can't risk blocking while holding
1109   // the pending list lock or a 3-way deadlock may occur
1110   // between the reference handler thread, a GC (instigated
1111   // by a compiler thread), and compiled method registration.
1112   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1113     return;
1114   }
1115 
1116   // Outputs from the following MutexLocker block:
1117   CompileTask* task     = NULL;
1118   bool         blocking = false;
1119   CompileQueue* queue  = compile_queue(comp_level);
1120 
1121   // Acquire our lock.
1122   {
1123     MutexLocker locker(queue->lock(), thread);
1124 
1125     // Make sure the method has not slipped into the queues since
1126     // last we checked; note that those checks were "fast bail-outs".
1127     // Here we need to be more careful, see 14012000 below.
1128     if (compilation_is_in_queue(method, osr_bci)) {
1129       return;
1130     }
1131 
1132     // We need to check again to see if the compilation has
1133     // completed.  A previous compilation may have registered
1134     // some result.
1135     if (compilation_is_complete(method, osr_bci, comp_level)) {
1136       return;
1137     }
1138 
1139     // We now know that this compilation is not pending, complete,
1140     // or prohibited.  Assign a compile_id to this compilation
1141     // and check to see if it is in our [Start..Stop) range.
1142     uint compile_id = assign_compile_id(method, osr_bci);
1143     if (compile_id == 0) {
1144       // The compilation falls outside the allowed range.
1145       return;
1146     }
1147 
1148     // Should this thread wait for completion of the compile?
1149     blocking = is_compile_blocking(method, osr_bci);
1150 
1151     // We will enter the compilation in the queue.
1152     // 14012000: Note that this sets the queued_for_compile bits in
1153     // the target method. We can now reason that a method cannot be
1154     // queued for compilation more than once, as follows:
1155     // Before a thread queues a task for compilation, it first acquires
1156     // the compile queue lock, then checks if the method's queued bits
1157     // are set or it has already been compiled. Thus there can not be two
1158     // instances of a compilation task for the same method on the
1159     // compilation queue. Consider now the case where the compilation
1160     // thread has already removed a task for that method from the queue
1161     // and is in the midst of compiling it. In this case, the
1162     // queued_for_compile bits must be set in the method (and these
1163     // will be visible to the current thread, since the bits were set
1164     // under protection of the compile queue lock, which we hold now.
1165     // When the compilation completes, the compiler thread first sets
1166     // the compilation result and then clears the queued_for_compile
1167     // bits. Neither of these actions are protected by a barrier (or done
1168     // under the protection of a lock), so the only guarantee we have
1169     // (on machines with TSO (Total Store Order)) is that these values
1170     // will update in that order. As a result, the only combinations of
1171     // these bits that the current thread will see are, in temporal order:
1172     // <RESULT, QUEUE> :
1173     //     <0, 1> : in compile queue, but not yet compiled
1174     //     <1, 1> : compiled but queue bit not cleared
1175     //     <1, 0> : compiled and queue bit cleared
1176     // Because we first check the queue bits then check the result bits,
1177     // we are assured that we cannot introduce a duplicate task.
1178     // Note that if we did the tests in the reverse order (i.e. check
1179     // result then check queued bit), we could get the result bit before
1180     // the compilation completed, and the queue bit after the compilation
1181     // completed, and end up introducing a "duplicate" (redundant) task.
1182     // In that case, the compiler thread should first check if a method
1183     // has already been compiled before trying to compile it.
1184     // NOTE: in the event that there are multiple compiler threads and
1185     // there is de-optimization/recompilation, things will get hairy,
1186     // and in that case it's best to protect both the testing (here) of
1187     // these bits, and their updating (here and elsewhere) under a
1188     // common lock.
1189     task = create_compile_task(queue,
1190                                compile_id, method,
1191                                osr_bci, comp_level,
1192                                hot_method, hot_count, comment,
1193                                blocking);
1194   }
1195 
1196   if (blocking) {
1197     wait_for_completion(task);
1198   }
1199 }
1200 
1201 
1202 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1203                                        int comp_level,
1204                                        methodHandle hot_method, int hot_count,
1205                                        const char* comment, Thread* THREAD) {
1206   // make sure arguments make sense
1207   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1208   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1209   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1210   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1211 
1212   // return quickly if possible
1213 
1214   // lock, make sure that the compilation
1215   // isn't prohibited in a straightforward way.
1216 
1217   if (compiler(comp_level) == NULL || !compiler(comp_level)->can_compile_method(method) || compilation_is_prohibited(method, osr_bci, comp_level)) {
1218     return NULL;
1219   }
1220 
1221   if (osr_bci == InvocationEntryBci) {
1222     // standard compilation
1223     nmethod* method_code = method->code();
1224     if (method_code != NULL) {
1225       if (compilation_is_complete(method, osr_bci, comp_level)) {
1226         return method_code;
1227       }
1228     }
1229     if (method->is_not_compilable(comp_level)) return NULL;
1230 
1231     if (UseCodeCacheFlushing) {
1232       nmethod* saved = CodeCache::find_and_remove_saved_code(method());
1233       if (saved != NULL) {
1234         method->set_code(method, saved);
1235         return saved;
1236       }
1237     }
1238 
1239   } else {
1240     // osr compilation
1241 #ifndef TIERED
1242     // seems like an assert of dubious value
1243     assert(comp_level == CompLevel_highest_tier,
1244            "all OSR compiles are assumed to be at a single compilation lavel");
1245 #endif // TIERED
1246     // We accept a higher level osr method
1247     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1248     if (nm != NULL) return nm;
1249     if (method->is_not_osr_compilable(comp_level)) return NULL;
1250   }
1251 
1252   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1253   // some prerequisites that are compiler specific
1254   if (compiler(comp_level)->is_c2() || compiler(comp_level)->is_shark()) {
1255     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1256     // Resolve all classes seen in the signature of the method
1257     // we are compiling.
1258     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1259   }
1260 
1261   // If the method is native, do the lookup in the thread requesting
1262   // the compilation. Native lookups can load code, which is not
1263   // permitted during compilation.
1264   //
1265   // Note: A native method implies non-osr compilation which is
1266   //       checked with an assertion at the entry of this method.
1267   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1268     bool in_base_library;
1269     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1270     if (HAS_PENDING_EXCEPTION) {
1271       // In case of an exception looking up the method, we just forget
1272       // about it. The interpreter will kick-in and throw the exception.
1273       method->set_not_compilable(); // implies is_not_osr_compilable()
1274       CLEAR_PENDING_EXCEPTION;
1275       return NULL;
1276     }
1277     assert(method->has_native_function(), "must have native code by now");
1278   }
1279 
1280   // RedefineClasses() has replaced this method; just return
1281   if (method->is_old()) {
1282     return NULL;
1283   }
1284 
1285   // JVMTI -- post_compile_event requires jmethod_id() that may require
1286   // a lock the compiling thread can not acquire. Prefetch it here.
1287   if (JvmtiExport::should_post_compiled_method_load()) {
1288     method->jmethod_id();
1289   }
1290 
1291   // If the compiler is shut off due to code cache flushing or otherwise,
1292   // fail out now so blocking compiles dont hang the java thread
1293   if (!should_compile_new_jobs() || (UseCodeCacheFlushing && CodeCache::needs_flushing())) {
1294     CompilationPolicy::policy()->delay_compilation(method());
1295     return NULL;
1296   }
1297 
1298   // do the compilation
1299   if (method->is_native()) {
1300     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1301       // Acquire our lock.
1302       int compile_id;
1303       {
1304         MutexLocker locker(MethodCompileQueue_lock, THREAD);
1305         compile_id = assign_compile_id(method, standard_entry_bci);
1306       }
1307       (void) AdapterHandlerLibrary::create_native_wrapper(method, compile_id);
1308     } else {
1309       return NULL;
1310     }
1311   } else {
1312     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1313   }
1314 
1315   // return requested nmethod
1316   // We accept a higher level osr method
1317   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1318 }
1319 
1320 
1321 // ------------------------------------------------------------------
1322 // CompileBroker::compilation_is_complete
1323 //
1324 // See if compilation of this method is already complete.
1325 bool CompileBroker::compilation_is_complete(methodHandle method,
1326                                             int          osr_bci,
1327                                             int          comp_level) {
1328   bool is_osr = (osr_bci != standard_entry_bci);
1329   if (is_osr) {
1330     if (method->is_not_osr_compilable(comp_level)) {
1331       return true;
1332     } else {
1333       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1334       return (result != NULL);
1335     }
1336   } else {
1337     if (method->is_not_compilable(comp_level)) {
1338       return true;
1339     } else {
1340       nmethod* result = method->code();
1341       if (result == NULL) return false;
1342       return comp_level == result->comp_level();
1343     }
1344   }
1345 }
1346 
1347 
1348 // ------------------------------------------------------------------
1349 // CompileBroker::compilation_is_in_queue
1350 //
1351 // See if this compilation is already requested.
1352 //
1353 // Implementation note: there is only a single "is in queue" bit
1354 // for each method.  This means that the check below is overly
1355 // conservative in the sense that an osr compilation in the queue
1356 // will block a normal compilation from entering the queue (and vice
1357 // versa).  This can be remedied by a full queue search to disambiguate
1358 // cases.  If it is deemed profitible, this may be done.
1359 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1360                                             int          osr_bci) {
1361   return method->queued_for_compilation();
1362 }
1363 
1364 // ------------------------------------------------------------------
1365 // CompileBroker::compilation_is_prohibited
1366 //
1367 // See if this compilation is not allowed.
1368 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1369   bool is_native = method->is_native();
1370   // Some compilers may not support the compilation of natives.
1371   if (is_native &&
1372       (!CICompileNatives || !compiler(comp_level)->supports_native())) {
1373     method->set_not_compilable_quietly(comp_level);
1374     return true;
1375   }
1376 
1377   bool is_osr = (osr_bci != standard_entry_bci);
1378   // Some compilers may not support on stack replacement.
1379   if (is_osr &&
1380       (!CICompileOSR || !compiler(comp_level)->supports_osr())) {
1381     method->set_not_osr_compilable(comp_level);
1382     return true;
1383   }
1384 
1385   // The method may be explicitly excluded by the user.
1386   bool quietly;
1387   if (CompilerOracle::should_exclude(method, quietly)) {
1388     if (!quietly) {
1389       // This does not happen quietly...
1390       ResourceMark rm;
1391       tty->print("### Excluding %s:%s",
1392                  method->is_native() ? "generation of native wrapper" : "compile",
1393                  (method->is_static() ? " static" : ""));
1394       method->print_short_name(tty);
1395       tty->cr();
1396     }
1397     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1398   }
1399 
1400   return false;
1401 }
1402 
1403 
1404 // ------------------------------------------------------------------
1405 // CompileBroker::assign_compile_id
1406 //
1407 // Assign a serialized id number to this compilation request.  If the
1408 // number falls out of the allowed range, return a 0.  OSR
1409 // compilations may be numbered separately from regular compilations
1410 // if certain debugging flags are used.
1411 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1412   assert(MethodCompileQueue_lock->owner() == Thread::current(),
1413          "must hold the compilation queue lock");
1414   bool is_osr = (osr_bci != standard_entry_bci);
1415   uint id;
1416   if (CICountOSR && is_osr) {
1417     id = ++_osr_compilation_id;
1418     if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1419       return id;
1420     }
1421   } else {
1422     id = ++_compilation_id;
1423     if ((uint)CIStart <= id && id < (uint)CIStop) {
1424       return id;
1425     }
1426   }
1427 
1428   // Method was not in the appropriate compilation range.
1429   method->set_not_compilable_quietly();
1430   return 0;
1431 }
1432 
1433 
1434 // ------------------------------------------------------------------
1435 // CompileBroker::is_compile_blocking
1436 //
1437 // Should the current thread be blocked until this compilation request
1438 // has been fulfilled?
1439 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1440   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1441   return !BackgroundCompilation;
1442 }
1443 
1444 
1445 // ------------------------------------------------------------------
1446 // CompileBroker::preload_classes
1447 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1448   // Move this code over from c1_Compiler.cpp
1449   ShouldNotReachHere();
1450 }
1451 
1452 
1453 // ------------------------------------------------------------------
1454 // CompileBroker::create_compile_task
1455 //
1456 // Create a CompileTask object representing the current request for
1457 // compilation.  Add this task to the queue.
1458 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1459                                               int           compile_id,
1460                                               methodHandle  method,
1461                                               int           osr_bci,
1462                                               int           comp_level,
1463                                               methodHandle  hot_method,
1464                                               int           hot_count,
1465                                               const char*   comment,
1466                                               bool          blocking) {
1467   CompileTask* new_task = allocate_task();
1468   new_task->initialize(compile_id, method, osr_bci, comp_level,
1469                        hot_method, hot_count, comment,
1470                        blocking);
1471   queue->add(new_task);
1472   return new_task;
1473 }
1474 
1475 
1476 // ------------------------------------------------------------------
1477 // CompileBroker::allocate_task
1478 //
1479 // Allocate a CompileTask, from the free list if possible.
1480 CompileTask* CompileBroker::allocate_task() {
1481   MutexLocker locker(CompileTaskAlloc_lock);
1482   CompileTask* task = NULL;
1483   if (_task_free_list != NULL) {
1484     task = _task_free_list;
1485     _task_free_list = task->next();
1486     task->set_next(NULL);
1487   } else {
1488     task = new CompileTask();
1489     task->set_next(NULL);
1490   }
1491   return task;
1492 }
1493 
1494 
1495 // ------------------------------------------------------------------
1496 // CompileBroker::free_task
1497 //
1498 // Add a task to the free list.
1499 void CompileBroker::free_task(CompileTask* task) {
1500   MutexLocker locker(CompileTaskAlloc_lock);
1501   task->free();
1502   task->set_next(_task_free_list);
1503   _task_free_list = task;
1504 }
1505 
1506 
1507 // ------------------------------------------------------------------
1508 // CompileBroker::wait_for_completion
1509 //
1510 // Wait for the given method CompileTask to complete.
1511 void CompileBroker::wait_for_completion(CompileTask* task) {
1512   if (CIPrintCompileQueue) {
1513     tty->print_cr("BLOCKING FOR COMPILE");
1514   }
1515 
1516   assert(task->is_blocking(), "can only wait on blocking task");
1517 
1518   JavaThread *thread = JavaThread::current();
1519   thread->set_blocked_on_compilation(true);
1520 
1521   methodHandle method(thread, task->method());
1522   {
1523     MutexLocker waiter(task->lock(), thread);
1524 
1525     while (!task->is_complete())
1526       task->lock()->wait();
1527   }
1528   // It is harmless to check this status without the lock, because
1529   // completion is a stable property (until the task object is recycled).
1530   assert(task->is_complete(), "Compilation should have completed");
1531   assert(task->code_handle() == NULL, "must be reset");
1532 
1533   thread->set_blocked_on_compilation(false);
1534 
1535   // By convention, the waiter is responsible for recycling a
1536   // blocking CompileTask. Since there is only one waiter ever
1537   // waiting on a CompileTask, we know that no one else will
1538   // be using this CompileTask; we can free it.
1539   free_task(task);
1540 }
1541 
1542 // ------------------------------------------------------------------
1543 // CompileBroker::compiler_thread_loop
1544 //
1545 // The main loop run by a CompilerThread.
1546 void CompileBroker::compiler_thread_loop() {
1547   CompilerThread* thread = CompilerThread::current();
1548   CompileQueue* queue = thread->queue();
1549 
1550   // For the thread that initializes the ciObjectFactory
1551   // this resource mark holds all the shared objects
1552   ResourceMark rm;
1553 
1554   // First thread to get here will initialize the compiler interface
1555 
1556   if (!ciObjectFactory::is_initialized()) {
1557     ASSERT_IN_VM;
1558     MutexLocker only_one (CompileThread_lock, thread);
1559     if (!ciObjectFactory::is_initialized()) {
1560       ciObjectFactory::initialize();
1561     }
1562   }
1563 
1564   // Open a log.
1565   if (LogCompilation) {
1566     init_compiler_thread_log();
1567   }
1568   CompileLog* log = thread->log();
1569   if (log != NULL) {
1570     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1571                     thread->name(),
1572                     os::current_thread_id(),
1573                     os::current_process_id());
1574     log->stamp();
1575     log->end_elem();
1576   }
1577 
1578   while (true) {
1579     {
1580       // We need this HandleMark to avoid leaking VM handles.
1581       HandleMark hm(thread);
1582 
1583       if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) {
1584         // the code cache is really full
1585         handle_full_code_cache();
1586       } else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
1587         // Attempt to start cleaning the code cache while there is still a little headroom
1588         NMethodSweeper::handle_full_code_cache(false);
1589       }
1590 
1591       CompileTask* task = queue->get();
1592 
1593       // Give compiler threads an extra quanta.  They tend to be bursty and
1594       // this helps the compiler to finish up the job.
1595       if( CompilerThreadHintNoPreempt )
1596         os::hint_no_preempt();
1597 
1598       // trace per thread time and compile statistics
1599       CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1600       PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1601 
1602       // Assign the task to the current thread.  Mark this compilation
1603       // thread as active for the profiler.
1604       CompileTaskWrapper ctw(task);
1605       nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1606       task->set_code_handle(&result_handle);
1607       methodHandle method(thread, task->method());
1608 
1609       // Never compile a method if breakpoints are present in it
1610       if (method()->number_of_breakpoints() == 0) {
1611         // Compile the method.
1612         if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1613 #ifdef COMPILER1
1614           // Allow repeating compilations for the purpose of benchmarking
1615           // compile speed. This is not useful for customers.
1616           if (CompilationRepeat != 0) {
1617             int compile_count = CompilationRepeat;
1618             while (compile_count > 0) {
1619               invoke_compiler_on_method(task);
1620               nmethod* nm = method->code();
1621               if (nm != NULL) {
1622                 nm->make_zombie();
1623                 method->clear_code();
1624               }
1625               compile_count--;
1626             }
1627           }
1628 #endif /* COMPILER1 */
1629           invoke_compiler_on_method(task);
1630         } else {
1631           // After compilation is disabled, remove remaining methods from queue
1632           method->clear_queued_for_compilation();
1633         }
1634       }
1635     }
1636   }
1637 }
1638 
1639 
1640 // ------------------------------------------------------------------
1641 // CompileBroker::init_compiler_thread_log
1642 //
1643 // Set up state required by +LogCompilation.
1644 void CompileBroker::init_compiler_thread_log() {
1645     CompilerThread* thread = CompilerThread::current();
1646     char  fileBuf[4*K];
1647     FILE* fp = NULL;
1648     char* file = NULL;
1649     intx thread_id = os::current_thread_id();
1650     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1651       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1652       if (dir == NULL) {
1653         jio_snprintf(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
1654                      thread_id, os::current_process_id());
1655       } else {
1656         jio_snprintf(fileBuf, sizeof(fileBuf),
1657                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1658                      os::file_separator(), thread_id, os::current_process_id());
1659       }
1660       fp = fopen(fileBuf, "at");
1661       if (fp != NULL) {
1662         file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1, mtCompiler);
1663         strcpy(file, fileBuf);
1664         break;
1665       }
1666     }
1667     if (fp == NULL) {
1668       warning("Cannot open log file: %s", fileBuf);
1669     } else {
1670       if (LogCompilation && Verbose)
1671         tty->print_cr("Opening compilation log %s", file);
1672       CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file, fp, thread_id);
1673       thread->init_log(log);
1674 
1675       if (xtty != NULL) {
1676         ttyLocker ttyl;
1677 
1678         // Record any per thread log files
1679         xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file);
1680       }
1681     }
1682 }
1683 
1684 // ------------------------------------------------------------------
1685 // CompileBroker::set_should_block
1686 //
1687 // Set _should_block.
1688 // Call this from the VM, with Threads_lock held and a safepoint requested.
1689 void CompileBroker::set_should_block() {
1690   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1691   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1692 #ifndef PRODUCT
1693   if (PrintCompilation && (Verbose || WizardMode))
1694     tty->print_cr("notifying compiler thread pool to block");
1695 #endif
1696   _should_block = true;
1697 }
1698 
1699 // ------------------------------------------------------------------
1700 // CompileBroker::maybe_block
1701 //
1702 // Call this from the compiler at convenient points, to poll for _should_block.
1703 void CompileBroker::maybe_block() {
1704   if (_should_block) {
1705 #ifndef PRODUCT
1706     if (PrintCompilation && (Verbose || WizardMode))
1707       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1708 #endif
1709     ThreadInVMfromNative tivfn(JavaThread::current());
1710   }
1711 }
1712 
1713 // wrapper for CodeCache::print_summary()
1714 static void codecache_print(bool detailed)
1715 {
1716   ResourceMark rm;
1717   stringStream s;
1718   // Dump code cache  into a buffer before locking the tty,
1719   {
1720     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1721     CodeCache::print_summary(&s, detailed);
1722   }
1723   ttyLocker ttyl;
1724   tty->print_cr(s.as_string());
1725 }
1726 
1727 // ------------------------------------------------------------------
1728 // CompileBroker::invoke_compiler_on_method
1729 //
1730 // Compile a method.
1731 //
1732 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1733   if (PrintCompilation) {
1734     ResourceMark rm;
1735     task->print_line();
1736   }
1737   elapsedTimer time;
1738 
1739   CompilerThread* thread = CompilerThread::current();
1740   ResourceMark rm(thread);
1741 
1742   if (LogEvents) {
1743     _compilation_log->log_compile(thread, task);
1744   }
1745 
1746   // Common flags.
1747   uint compile_id = task->compile_id();
1748   int osr_bci = task->osr_bci();
1749   bool is_osr = (osr_bci != standard_entry_bci);
1750   bool should_log = (thread->log() != NULL);
1751   bool should_break = false;
1752   {
1753     // create the handle inside it's own block so it can't
1754     // accidentally be referenced once the thread transitions to
1755     // native.  The NoHandleMark before the transition should catch
1756     // any cases where this occurs in the future.
1757     methodHandle method(thread, task->method());
1758     should_break = check_break_at(method, compile_id, is_osr);
1759     if (should_log && !CompilerOracle::should_log(method)) {
1760       should_log = false;
1761     }
1762     assert(!method->is_native(), "no longer compile natives");
1763 
1764     // Save information about this method in case of failure.
1765     set_last_compile(thread, method, is_osr, task->comp_level());
1766 
1767     DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler(task->comp_level()), method);
1768   }
1769 
1770   // Allocate a new set of JNI handles.
1771   push_jni_handle_block();
1772   Method* target_handle = task->method();
1773   int compilable = ciEnv::MethodCompilable;
1774   {
1775     int system_dictionary_modification_counter;
1776     {
1777       MutexLocker locker(Compile_lock, thread);
1778       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1779     }
1780 
1781     NoHandleMark  nhm;
1782     ThreadToNativeFromVM ttn(thread);
1783 
1784     ciEnv ci_env(task, system_dictionary_modification_counter);
1785     if (should_break) {
1786       ci_env.set_break_at_compile(true);
1787     }
1788     if (should_log) {
1789       ci_env.set_log(thread->log());
1790     }
1791     assert(thread->env() == &ci_env, "set by ci_env");
1792     // The thread-env() field is cleared in ~CompileTaskWrapper.
1793 
1794     // Cache Jvmti state
1795     ci_env.cache_jvmti_state();
1796 
1797     // Cache DTrace flags
1798     ci_env.cache_dtrace_flags();
1799 
1800     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1801 
1802     TraceTime t1("compilation", &time);
1803 
1804     compiler(task->comp_level())->compile_method(&ci_env, target, osr_bci);
1805 
1806     if (!ci_env.failing() && task->code() == NULL) {
1807       //assert(false, "compiler should always document failure");
1808       // The compiler elected, without comment, not to register a result.
1809       // Do not attempt further compilations of this method.
1810       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1811     }
1812 
1813     // Copy this bit to the enclosing block:
1814     compilable = ci_env.compilable();
1815 
1816     if (ci_env.failing()) {
1817       const char* retry_message = ci_env.retry_message();
1818       if (_compilation_log != NULL) {
1819         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1820       }
1821       if (PrintCompilation) {
1822         FormatBufferResource msg = retry_message != NULL ?
1823             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1824             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1825         task->print_compilation(tty, msg);
1826       }
1827     } else {
1828       task->mark_success();
1829       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1830       if (_compilation_log != NULL) {
1831         nmethod* code = task->code();
1832         if (code != NULL) {
1833           _compilation_log->log_nmethod(thread, code);
1834         }
1835       }
1836     }
1837   }
1838   pop_jni_handle_block();
1839 
1840   methodHandle method(thread, task->method());
1841 
1842   DTRACE_METHOD_COMPILE_END_PROBE(compiler(task->comp_level()), method, task->is_success());
1843 
1844   collect_statistics(thread, time, task);
1845 
1846   if (PrintCompilation && PrintCompilation2) {
1847     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
1848     tty->print("%4d ", compile_id);    // print compilation number
1849     tty->print("%s ", (is_osr ? "%" : " "));
1850     int code_size = (task->code() == NULL) ? 0 : task->code()->total_size();
1851     tty->print_cr("size: %d time: %d inlined: %d bytes", code_size, (int)time.milliseconds(), task->num_inlined_bytecodes());
1852   }
1853 
1854   if (PrintCodeCacheOnCompilation)
1855     codecache_print(/* detailed= */ false);
1856 
1857   // Disable compilation, if required.
1858   switch (compilable) {
1859   case ciEnv::MethodCompilable_never:
1860     if (is_osr)
1861       method->set_not_osr_compilable_quietly();
1862     else
1863       method->set_not_compilable_quietly();
1864     break;
1865   case ciEnv::MethodCompilable_not_at_tier:
1866     if (is_osr)
1867       method->set_not_osr_compilable_quietly(task->comp_level());
1868     else
1869       method->set_not_compilable_quietly(task->comp_level());
1870     break;
1871   }
1872 
1873   // Note that the queued_for_compilation bits are cleared without
1874   // protection of a mutex. [They were set by the requester thread,
1875   // when adding the task to the complie queue -- at which time the
1876   // compile queue lock was held. Subsequently, we acquired the compile
1877   // queue lock to get this task off the compile queue; thus (to belabour
1878   // the point somewhat) our clearing of the bits must be occurring
1879   // only after the setting of the bits. See also 14012000 above.
1880   method->clear_queued_for_compilation();
1881 
1882 #ifdef ASSERT
1883   if (CollectedHeap::fired_fake_oom()) {
1884     // The current compile received a fake OOM during compilation so
1885     // go ahead and exit the VM since the test apparently succeeded
1886     tty->print_cr("*** Shutting down VM after successful fake OOM");
1887     vm_exit(0);
1888   }
1889 #endif
1890 }
1891 
1892 // ------------------------------------------------------------------
1893 // CompileBroker::handle_full_code_cache
1894 //
1895 // The CodeCache is full.  Print out warning and disable compilation or
1896 // try code cache cleaning so compilation can continue later.
1897 void CompileBroker::handle_full_code_cache() {
1898   UseInterpreter = true;
1899   if (UseCompiler || AlwaysCompileLoopMethods ) {
1900     if (xtty != NULL) {
1901       ResourceMark rm;
1902       stringStream s;
1903       // Dump code cache state into a buffer before locking the tty,
1904       // because log_state() will use locks causing lock conflicts.
1905       CodeCache::log_state(&s);
1906       // Lock to prevent tearing
1907       ttyLocker ttyl;
1908       xtty->begin_elem("code_cache_full");
1909       xtty->print(s.as_string());
1910       xtty->stamp();
1911       xtty->end_elem();
1912     }
1913     warning("CodeCache is full. Compiler has been disabled.");
1914     warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1915 #ifndef PRODUCT
1916     if (CompileTheWorld || ExitOnFullCodeCache) {
1917       codecache_print(/* detailed= */ true);
1918       before_exit(JavaThread::current());
1919       exit_globals(); // will delete tty
1920       vm_direct_exit(CompileTheWorld ? 0 : 1);
1921     }
1922 #endif
1923     if (UseCodeCacheFlushing) {
1924       NMethodSweeper::handle_full_code_cache(true);
1925     } else {
1926       UseCompiler               = false;
1927       AlwaysCompileLoopMethods  = false;
1928     }
1929   }
1930   codecache_print(/* detailed= */ true);
1931 }
1932 
1933 // ------------------------------------------------------------------
1934 // CompileBroker::set_last_compile
1935 //
1936 // Record this compilation for debugging purposes.
1937 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1938   ResourceMark rm;
1939   char* method_name = method->name()->as_C_string();
1940   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1941   char current_method[CompilerCounters::cmname_buffer_length];
1942   size_t maxLen = CompilerCounters::cmname_buffer_length;
1943 
1944   if (UsePerfData) {
1945     const char* class_name = method->method_holder()->name()->as_C_string();
1946 
1947     size_t s1len = strlen(class_name);
1948     size_t s2len = strlen(method_name);
1949 
1950     // check if we need to truncate the string
1951     if (s1len + s2len + 2 > maxLen) {
1952 
1953       // the strategy is to lop off the leading characters of the
1954       // class name and the trailing characters of the method name.
1955 
1956       if (s2len + 2 > maxLen) {
1957         // lop of the entire class name string, let snprintf handle
1958         // truncation of the method name.
1959         class_name += s1len; // null string
1960       }
1961       else {
1962         // lop off the extra characters from the front of the class name
1963         class_name += ((s1len + s2len + 2) - maxLen);
1964       }
1965     }
1966 
1967     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1968   }
1969 
1970   if (CICountOSR && is_osr) {
1971     _last_compile_type = osr_compile;
1972   } else {
1973     _last_compile_type = normal_compile;
1974   }
1975   _last_compile_level = comp_level;
1976 
1977   if (UsePerfData) {
1978     CompilerCounters* counters = thread->counters();
1979     counters->set_current_method(current_method);
1980     counters->set_compile_type((jlong)_last_compile_type);
1981   }
1982 }
1983 
1984 
1985 // ------------------------------------------------------------------
1986 // CompileBroker::push_jni_handle_block
1987 //
1988 // Push on a new block of JNI handles.
1989 void CompileBroker::push_jni_handle_block() {
1990   JavaThread* thread = JavaThread::current();
1991 
1992   // Allocate a new block for JNI handles.
1993   // Inlined code from jni_PushLocalFrame()
1994   JNIHandleBlock* java_handles = thread->active_handles();
1995   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
1996   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
1997   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
1998   thread->set_active_handles(compile_handles);
1999 }
2000 
2001 
2002 // ------------------------------------------------------------------
2003 // CompileBroker::pop_jni_handle_block
2004 //
2005 // Pop off the current block of JNI handles.
2006 void CompileBroker::pop_jni_handle_block() {
2007   JavaThread* thread = JavaThread::current();
2008 
2009   // Release our JNI handle block
2010   JNIHandleBlock* compile_handles = thread->active_handles();
2011   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2012   thread->set_active_handles(java_handles);
2013   compile_handles->set_pop_frame_link(NULL);
2014   JNIHandleBlock::release_block(compile_handles, thread); // may block
2015 }
2016 
2017 
2018 // ------------------------------------------------------------------
2019 // CompileBroker::check_break_at
2020 //
2021 // Should the compilation break at the current compilation.
2022 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2023   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2024     return true;
2025   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2026     return true;
2027   } else {
2028     return (compile_id == CIBreakAt);
2029   }
2030 }
2031 
2032 // ------------------------------------------------------------------
2033 // CompileBroker::collect_statistics
2034 //
2035 // Collect statistics about the compilation.
2036 
2037 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2038   bool success = task->is_success();
2039   methodHandle method (thread, task->method());
2040   uint compile_id = task->compile_id();
2041   bool is_osr = (task->osr_bci() != standard_entry_bci);
2042   nmethod* code = task->code();
2043   CompilerCounters* counters = thread->counters();
2044 
2045   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2046   MutexLocker locker(CompileStatistics_lock);
2047 
2048   // _perf variables are production performance counters which are
2049   // updated regardless of the setting of the CITime and CITimeEach flags
2050   //
2051   if (!success) {
2052     _total_bailout_count++;
2053     if (UsePerfData) {
2054       _perf_last_failed_method->set_value(counters->current_method());
2055       _perf_last_failed_type->set_value(counters->compile_type());
2056       _perf_total_bailout_count->inc();
2057     }
2058   } else if (code == NULL) {
2059     if (UsePerfData) {
2060       _perf_last_invalidated_method->set_value(counters->current_method());
2061       _perf_last_invalidated_type->set_value(counters->compile_type());
2062       _perf_total_invalidated_count->inc();
2063     }
2064     _total_invalidated_count++;
2065   } else {
2066     // Compilation succeeded
2067 
2068     // update compilation ticks - used by the implementation of
2069     // java.lang.management.CompilationMBean
2070     _perf_total_compilation->inc(time.ticks());
2071 
2072     if (CITime) {
2073       _t_total_compilation.add(time);
2074       if (is_osr) {
2075         _t_osr_compilation.add(time);
2076         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2077       } else {
2078         _t_standard_compilation.add(time);
2079         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2080       }
2081     }
2082 
2083     if (UsePerfData) {
2084       // save the name of the last method compiled
2085       _perf_last_method->set_value(counters->current_method());
2086       _perf_last_compile_type->set_value(counters->compile_type());
2087       _perf_last_compile_size->set_value(method->code_size() +
2088                                          task->num_inlined_bytecodes());
2089       if (is_osr) {
2090         _perf_osr_compilation->inc(time.ticks());
2091         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2092       } else {
2093         _perf_standard_compilation->inc(time.ticks());
2094         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2095       }
2096     }
2097 
2098     if (CITimeEach) {
2099       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2100       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2101                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2102     }
2103 
2104     // Collect counts of successful compilations
2105     _sum_nmethod_size      += code->total_size();
2106     _sum_nmethod_code_size += code->insts_size();
2107     _total_compile_count++;
2108 
2109     if (UsePerfData) {
2110       _perf_sum_nmethod_size->inc(     code->total_size());
2111       _perf_sum_nmethod_code_size->inc(code->insts_size());
2112       _perf_total_compile_count->inc();
2113     }
2114 
2115     if (is_osr) {
2116       if (UsePerfData) _perf_total_osr_compile_count->inc();
2117       _total_osr_compile_count++;
2118     } else {
2119       if (UsePerfData) _perf_total_standard_compile_count->inc();
2120       _total_standard_compile_count++;
2121     }
2122   }
2123   // set the current method for the thread to null
2124   if (UsePerfData) counters->set_current_method("");
2125 }
2126 
2127 
2128 
2129 void CompileBroker::print_times() {
2130   tty->cr();
2131   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2132   tty->print_cr("------------------------------------------------");
2133                //0000000000111111111122222222223333333333444444444455555555556666666666
2134                //0123456789012345678901234567890123456789012345678901234567890123456789
2135   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2136   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2137                 CompileBroker::_t_standard_compilation.seconds(),
2138                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2139   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);
2140 
2141   if (compiler(CompLevel_simple) != NULL) {
2142     compiler(CompLevel_simple)->print_timers();
2143   }
2144   if (compiler(CompLevel_full_optimization) != NULL) {
2145     compiler(CompLevel_full_optimization)->print_timers();
2146   }
2147   tty->cr();
2148   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2149   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2150   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2151   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2152   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2153   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2154   tty->cr();
2155   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2156   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2157 }
2158 
2159 
2160 // Debugging output for failure
2161 void CompileBroker::print_last_compile() {
2162   if ( _last_compile_level != CompLevel_none &&
2163        compiler(_last_compile_level) != NULL &&
2164        _last_method_compiled != NULL &&
2165        _last_compile_type != no_compile) {
2166     if (_last_compile_type == osr_compile) {
2167       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2168                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2169     } else {
2170       tty->print_cr("Last parse:  %d+++(%d) %s",
2171                     _compilation_id, _last_compile_level, _last_method_compiled);
2172     }
2173   }
2174 }
2175 
2176 
2177 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2178 #ifndef PRODUCT
2179   st->print_cr("Compiler thread printing unimplemented.");
2180   st->cr();
2181 #endif
2182 }