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 #ifndef USDT2
  64 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,
  65   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);
  66 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,
  67   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);
  68 
  69 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \
  70   {                                                                      \
  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(method, comp_name, success)      \
  82   {                                                                      \
  83     Symbol* klass_name = (method)->klass_name();                         \
  84     Symbol* name = (method)->name();                                     \
  85     Symbol* signature = (method)->signature();                           \
  86     HS_DTRACE_PROBE9(hotspot, method__compile__end,                      \
  87       comp_name, strlen(comp_name),                                      \
  88       klass_name->bytes(), klass_name->utf8_length(),                    \
  89       name->bytes(), name->utf8_length(),                                \
  90       signature->bytes(), signature->utf8_length(), (success));          \
  91   }
  92 
  93 #else /* USDT2 */
  94 
  95 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \
  96   {                                                                      \
  97     Symbol* klass_name = (method)->klass_name();                         \
  98     Symbol* name = (method)->name();                                     \
  99     Symbol* signature = (method)->signature();                           \
 100     HOTSPOT_METHOD_COMPILE_BEGIN(                                        \
 101       comp_name, strlen(comp_name),                                      \
 102       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
 103       (char *) name->bytes(), name->utf8_length(),                       \
 104       (char *) signature->bytes(), signature->utf8_length());            \
 105   }
 106 
 107 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \
 108   {                                                                      \
 109     Symbol* klass_name = (method)->klass_name();                         \
 110     Symbol* name = (method)->name();                                     \
 111     Symbol* signature = (method)->signature();                           \
 112     HOTSPOT_METHOD_COMPILE_END(                                          \
 113       comp_name, strlen(comp_name),                                      \
 114       (char *) klass_name->bytes(), klass_name->utf8_length(),           \
 115       (char *) name->bytes(), name->utf8_length(),                       \
 116       (char *) signature->bytes(), signature->utf8_length(), (success)); \
 117   }
 118 #endif /* USDT2 */
 119 
 120 #else //  ndef DTRACE_ENABLED
 121 
 122 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
 123 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
 124 
 125 #endif // ndef DTRACE_ENABLED
 126 
 127 bool CompileBroker::_initialized = false;
 128 volatile bool CompileBroker::_should_block = false;
 129 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 130 
 131 // The installed compiler(s)
 132 AbstractCompiler* CompileBroker::_compilers[2];
 133 
 134 // These counters are used for assigning id's to each compilation
 135 uint CompileBroker::_compilation_id        = 0;
 136 uint CompileBroker::_osr_compilation_id    = 0;
 137 
 138 // Debugging information
 139 int  CompileBroker::_last_compile_type     = no_compile;
 140 int  CompileBroker::_last_compile_level    = CompLevel_none;
 141 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 142 
 143 // Performance counters
 144 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 145 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 146 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 147 
 148 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 149 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 150 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 151 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 152 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 153 
 154 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 155 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 156 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 157 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 158 
 159 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 160 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 161 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 162 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 163 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 164 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 165 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 166 
 167 // Timers and counters for generating statistics
 168 elapsedTimer CompileBroker::_t_total_compilation;
 169 elapsedTimer CompileBroker::_t_osr_compilation;
 170 elapsedTimer CompileBroker::_t_standard_compilation;
 171 
 172 int CompileBroker::_total_bailout_count          = 0;
 173 int CompileBroker::_total_invalidated_count      = 0;
 174 int CompileBroker::_total_compile_count          = 0;
 175 int CompileBroker::_total_osr_compile_count      = 0;
 176 int CompileBroker::_total_standard_compile_count = 0;
 177 
 178 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 179 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 180 int CompileBroker::_sum_nmethod_size             = 0;
 181 int CompileBroker::_sum_nmethod_code_size        = 0;
 182 
 183 long CompileBroker::_peak_compilation_time       = 0;
 184 
 185 CompileQueue* CompileBroker::_c2_method_queue    = NULL;
 186 CompileQueue* CompileBroker::_c1_method_queue    = NULL;
 187 CompileTask*  CompileBroker::_task_free_list     = NULL;
 188 
 189 GrowableArray<CompilerThread*>* CompileBroker::_method_threads = NULL;
 190 
 191 
 192 class CompilationLog : public StringEventLog {
 193  public:
 194   CompilationLog() : StringEventLog("Compilation events") {
 195   }
 196 
 197   void log_compile(JavaThread* thread, CompileTask* task) {
 198     StringLogMessage lm;
 199     stringStream sstr = lm.stream();
 200     // msg.time_stamp().update_to(tty->time_stamp().ticks());
 201     task->print_compilation(&sstr, NULL, true);
 202     log(thread, "%s", (const char*)lm);
 203   }
 204 
 205   void log_nmethod(JavaThread* thread, nmethod* nm) {
 206     log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 207         nm->compile_id(), nm->is_osr_method() ? "%" : "",
 208         nm, nm->code_begin(), nm->code_end());
 209   }
 210 
 211   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
 212     StringLogMessage lm;
 213     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);
 214     if (retry_message != NULL) {
 215       lm.append(" (%s)", retry_message);
 216     }
 217     lm.print("\n");
 218     log(thread, "%s", (const char*)lm);
 219   }
 220 };
 221 
 222 static CompilationLog* _compilation_log = NULL;
 223 
 224 void compileBroker_init() {
 225   if (LogEvents) {
 226     _compilation_log = new CompilationLog();
 227   }
 228 }
 229 
 230 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
 231   CompilerThread* thread = CompilerThread::current();
 232   thread->set_task(task);
 233   CompileLog*     log  = thread->log();
 234   if (log != NULL)  task->log_task_start(log);
 235 }
 236 
 237 CompileTaskWrapper::~CompileTaskWrapper() {
 238   CompilerThread* thread = CompilerThread::current();
 239   CompileTask* task = thread->task();
 240   CompileLog*  log  = thread->log();
 241   if (log != NULL)  task->log_task_done(log);
 242   thread->set_task(NULL);
 243   task->set_code_handle(NULL);
 244   thread->set_env(NULL);
 245   if (task->is_blocking()) {
 246     MutexLocker notifier(task->lock(), thread);
 247     task->mark_complete();
 248     // Notify the waiting thread that the compilation has completed.
 249     task->lock()->notify_all();
 250   } else {
 251     task->mark_complete();
 252 
 253     // By convention, the compiling thread is responsible for
 254     // recycling a non-blocking CompileTask.
 255     CompileBroker::free_task(task);
 256   }
 257 }
 258 
 259 
 260 // ------------------------------------------------------------------
 261 // CompileTask::initialize
 262 void CompileTask::initialize(int compile_id,
 263                              methodHandle method,
 264                              int osr_bci,
 265                              int comp_level,
 266                              methodHandle hot_method,
 267                              int hot_count,
 268                              const char* comment,
 269                              bool is_blocking) {
 270   assert(!_lock->is_locked(), "bad locking");
 271 
 272   _compile_id = compile_id;
 273   _method = method();
 274   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
 275   _osr_bci = osr_bci;
 276   _is_blocking = is_blocking;
 277   _comp_level = comp_level;
 278   _num_inlined_bytecodes = 0;
 279 
 280   _is_complete = false;
 281   _is_success = false;
 282   _code_handle = NULL;
 283 
 284   _hot_method = NULL;
 285   _hot_method_holder = NULL;
 286   _hot_count = hot_count;
 287   _time_queued = 0;  // tidy
 288   _comment = comment;
 289 
 290   if (LogCompilation) {
 291     _time_queued = os::elapsed_counter();
 292     if (hot_method.not_null()) {
 293       if (hot_method == method) {
 294         _hot_method = _method;
 295       } else {
 296         _hot_method = hot_method();
 297         // only add loader or mirror if different from _method_holder
 298         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
 299       }
 300     }
 301   }
 302 
 303   _next = NULL;
 304 }
 305 
 306 // ------------------------------------------------------------------
 307 // CompileTask::code/set_code
 308 nmethod* CompileTask::code() const {
 309   if (_code_handle == NULL)  return NULL;
 310   return _code_handle->code();
 311 }
 312 void CompileTask::set_code(nmethod* nm) {
 313   if (_code_handle == NULL && nm == NULL)  return;
 314   guarantee(_code_handle != NULL, "");
 315   _code_handle->set_code(nm);
 316   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 317 }
 318 
 319 // ------------------------------------------------------------------
 320 // CompileTask::free
 321 void CompileTask::free() {
 322   set_code(NULL);
 323   assert(!_lock->is_locked(), "Should not be locked when freed");
 324   JNIHandles::destroy_global(_method_holder);
 325   JNIHandles::destroy_global(_hot_method_holder);
 326 }
 327 
 328 
 329 void CompileTask::mark_on_stack() {
 330   // Mark these methods as something redefine classes cannot remove.
 331   _method->set_on_stack(true);
 332   if (_hot_method != NULL) {
 333     _hot_method->set_on_stack(true);
 334   }
 335 }
 336 
 337 // ------------------------------------------------------------------
 338 // CompileTask::print
 339 void CompileTask::print() {
 340   tty->print("<CompileTask compile_id=%d ", _compile_id);
 341   tty->print("method=");
 342   _method->print_name(tty);
 343   tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
 344              _osr_bci, bool_to_str(_is_blocking),
 345              bool_to_str(_is_complete), bool_to_str(_is_success));
 346 }
 347 
 348 
 349 // ------------------------------------------------------------------
 350 // CompileTask::print_line_on_error
 351 //
 352 // This function is called by fatal error handler when the thread
 353 // causing troubles is a compiler thread.
 354 //
 355 // Do not grab any lock, do not allocate memory.
 356 //
 357 // Otherwise it's the same as CompileTask::print_line()
 358 //
 359 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
 360   // print compiler name
 361   st->print("%s:", CompileBroker::compiler_name(comp_level()));
 362   print_compilation(st);
 363 }
 364 
 365 // ------------------------------------------------------------------
 366 // CompileTask::print_line
 367 void CompileTask::print_line() {
 368   ttyLocker ttyl;  // keep the following output all in one block
 369   // print compiler name if requested
 370   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
 371   print_compilation();
 372 }
 373 
 374 
 375 // ------------------------------------------------------------------
 376 // CompileTask::print_compilation_impl
 377 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
 378                                          bool is_osr_method, int osr_bci, bool is_blocking,
 379                                          const char* msg, bool short_form) {
 380   if (!short_form) {
 381     st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp
 382   }
 383   st->print("%4d ", compile_id);    // print compilation number
 384 
 385   // For unloaded methods the transition to zombie occurs after the
 386   // method is cleared so it's impossible to report accurate
 387   // information for that case.
 388   bool is_synchronized = false;
 389   bool has_exception_handler = false;
 390   bool is_native = false;
 391   if (method != NULL) {
 392     is_synchronized       = method->is_synchronized();
 393     has_exception_handler = method->has_exception_handler();
 394     is_native             = method->is_native();
 395   }
 396   // method attributes
 397   const char compile_type   = is_osr_method                   ? '%' : ' ';
 398   const char sync_char      = is_synchronized                 ? 's' : ' ';
 399   const char exception_char = has_exception_handler           ? '!' : ' ';
 400   const char blocking_char  = is_blocking                     ? 'b' : ' ';
 401   const char native_char    = is_native                       ? 'n' : ' ';
 402 
 403   // print method attributes
 404   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
 405 
 406   if (TieredCompilation) {
 407     if (comp_level != -1)  st->print("%d ", comp_level);
 408     else                   st->print("- ");
 409   }
 410   st->print("     ");  // more indent
 411 
 412   if (method == NULL) {
 413     st->print("(method)");
 414   } else {
 415     method->print_short_name(st);
 416     if (is_osr_method) {
 417       st->print(" @ %d", osr_bci);
 418     }
 419     if (method->is_native())
 420       st->print(" (native)");
 421     else
 422       st->print(" (%d bytes)", method->code_size());
 423   }
 424 
 425   if (msg != NULL) {
 426     st->print("   %s", msg);
 427   }
 428   if (!short_form) {
 429     st->cr();
 430   }
 431 }
 432 
 433 // ------------------------------------------------------------------
 434 // CompileTask::print_inlining
 435 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
 436   //         1234567
 437   st->print("        ");     // print timestamp
 438   //         1234
 439   st->print("     ");        // print compilation number
 440 
 441   // method attributes
 442   if (method->is_loaded()) {
 443     const char sync_char      = method->is_synchronized()        ? 's' : ' ';
 444     const char exception_char = method->has_exception_handlers() ? '!' : ' ';
 445     const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';
 446 
 447     // print method attributes
 448     st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);
 449   } else {
 450     //         %s!bn
 451     st->print("      ");     // print method attributes
 452   }
 453 
 454   if (TieredCompilation) {
 455     st->print("  ");
 456   }
 457   st->print("     ");        // more indent
 458   st->print("    ");         // initial inlining indent
 459 
 460   for (int i = 0; i < inline_level; i++)  st->print("  ");
 461 
 462   st->print("@ %d  ", bci);  // print bci
 463   method->print_short_name(st);
 464   if (method->is_loaded())
 465     st->print(" (%d bytes)", method->code_size());
 466   else
 467     st->print(" (not loaded)");
 468 
 469   if (msg != NULL) {
 470     st->print("   %s", msg);
 471   }
 472   st->cr();
 473 }
 474 
 475 // ------------------------------------------------------------------
 476 // CompileTask::print_inline_indent
 477 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
 478   //         1234567
 479   st->print("        ");     // print timestamp
 480   //         1234
 481   st->print("     ");        // print compilation number
 482   //         %s!bn
 483   st->print("      ");       // print method attributes
 484   if (TieredCompilation) {
 485     st->print("  ");
 486   }
 487   st->print("     ");        // more indent
 488   st->print("    ");         // initial inlining indent
 489   for (int i = 0; i < inline_level; i++)  st->print("  ");
 490 }
 491 
 492 // ------------------------------------------------------------------
 493 // CompileTask::print_compilation
 494 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
 495   bool is_osr_method = osr_bci() != InvocationEntryBci;
 496   print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
 497 }
 498 
 499 // ------------------------------------------------------------------
 500 // CompileTask::log_task
 501 void CompileTask::log_task(xmlStream* log) {
 502   Thread* thread = Thread::current();
 503   methodHandle method(thread, this->method());
 504   ResourceMark rm(thread);
 505 
 506   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
 507   log->print(" compile_id='%d'", _compile_id);
 508   if (_osr_bci != CompileBroker::standard_entry_bci) {
 509     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind
 510   } // else compile_kind='c2c'
 511   if (!method.is_null())  log->method(method);
 512   if (_osr_bci != CompileBroker::standard_entry_bci) {
 513     log->print(" osr_bci='%d'", _osr_bci);
 514   }
 515   if (_comp_level != CompLevel_highest_tier) {
 516     log->print(" level='%d'", _comp_level);
 517   }
 518   if (_is_blocking) {
 519     log->print(" blocking='1'");
 520   }
 521   log->stamp();
 522 }
 523 
 524 
 525 // ------------------------------------------------------------------
 526 // CompileTask::log_task_queued
 527 void CompileTask::log_task_queued() {
 528   Thread* thread = Thread::current();
 529   ttyLocker ttyl;
 530   ResourceMark rm(thread);
 531 
 532   xtty->begin_elem("task_queued");
 533   log_task(xtty);
 534   if (_comment != NULL) {
 535     xtty->print(" comment='%s'", _comment);
 536   }
 537   if (_hot_method != NULL) {
 538     methodHandle hot(thread, _hot_method);
 539     methodHandle method(thread, _method);
 540     if (hot() != method()) {
 541       xtty->method(hot);
 542     }
 543   }
 544   if (_hot_count != 0) {
 545     xtty->print(" hot_count='%d'", _hot_count);
 546   }
 547   xtty->end_elem();
 548 }
 549 
 550 
 551 // ------------------------------------------------------------------
 552 // CompileTask::log_task_start
 553 void CompileTask::log_task_start(CompileLog* log)   {
 554   log->begin_head("task");
 555   log_task(log);
 556   log->end_head();
 557 }
 558 
 559 
 560 // ------------------------------------------------------------------
 561 // CompileTask::log_task_done
 562 void CompileTask::log_task_done(CompileLog* log) {
 563   Thread* thread = Thread::current();
 564   methodHandle method(thread, this->method());
 565   ResourceMark rm(thread);
 566 
 567   // <task_done ... stamp='1.234'>  </task>
 568   nmethod* nm = code();
 569   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
 570                   _is_success, nm == NULL ? 0 : nm->content_size(),
 571                   method->invocation_count());
 572   int bec = method->backedge_count();
 573   if (bec != 0)  log->print(" backedge_count='%d'", bec);
 574   // Note:  "_is_complete" is about to be set, but is not.
 575   if (_num_inlined_bytecodes != 0) {
 576     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
 577   }
 578   log->stamp();
 579   log->end_elem();
 580   log->tail("task");
 581   log->clear_identities();   // next task will have different CI
 582   if (log->unflushed_count() > 2000) {
 583     log->flush();
 584   }
 585   log->mark_file_end();
 586 }
 587 
 588 
 589 
 590 // ------------------------------------------------------------------
 591 // CompileQueue::add
 592 //
 593 // Add a CompileTask to a CompileQueue
 594 void CompileQueue::add(CompileTask* task) {
 595   assert(lock()->owned_by_self(), "must own lock");
 596 
 597   task->set_next(NULL);
 598   task->set_prev(NULL);
 599 
 600   if (_last == NULL) {
 601     // The compile queue is empty.
 602     assert(_first == NULL, "queue is empty");
 603     _first = task;
 604     _last = task;
 605   } else {
 606     // Append the task to the queue.
 607     assert(_last->next() == NULL, "not last");
 608     _last->set_next(task);
 609     task->set_prev(_last);
 610     _last = task;
 611   }
 612   ++_size;
 613 
 614   // Mark the method as being in the compile queue.
 615   task->method()->set_queued_for_compilation();
 616 
 617   if (CIPrintCompileQueue) {
 618     print();
 619   }
 620 
 621   if (LogCompilation && xtty != NULL) {
 622     task->log_task_queued();
 623   }
 624 
 625   // Notify CompilerThreads that a task is available.
 626   lock()->notify_all();
 627 }
 628 
 629 // ------------------------------------------------------------------
 630 // CompileQueue::get
 631 //
 632 // Get the next CompileTask from a CompileQueue
 633 CompileTask* CompileQueue::get() {
 634   NMethodSweeper::possibly_sweep();
 635 
 636   MutexLocker locker(lock());
 637   // Wait for an available CompileTask.
 638   while (_first == NULL) {
 639     // There is no work to be done right now.  Wait.
 640     if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() || CodeCache::needs_flushing())) {
 641       // During the emergency sweeping periods, wake up and sweep occasionally
 642       bool timedout = lock()->wait(!Mutex::_no_safepoint_check_flag, NmethodSweepCheckInterval*1000);
 643       if (timedout) {
 644         MutexUnlocker ul(lock());
 645         // When otherwise not busy, run nmethod sweeping
 646         NMethodSweeper::possibly_sweep();
 647       }
 648     } else {
 649       // During normal operation no need to wake up on timer
 650       lock()->wait();
 651     }
 652   }
 653   CompileTask* task = CompilationPolicy::policy()->select_task(this);
 654   remove(task);
 655   return task;
 656 }
 657 
 658 void CompileQueue::remove(CompileTask* task)
 659 {
 660    assert(lock()->owned_by_self(), "must own lock");
 661   if (task->prev() != NULL) {
 662     task->prev()->set_next(task->next());
 663   } else {
 664     // max is the first element
 665     assert(task == _first, "Sanity");
 666     _first = task->next();
 667   }
 668 
 669   if (task->next() != NULL) {
 670     task->next()->set_prev(task->prev());
 671   } else {
 672     // max is the last element
 673     assert(task == _last, "Sanity");
 674     _last = task->prev();
 675   }
 676   --_size;
 677 }
 678 
 679 // methods in the compile queue need to be marked as used on the stack
 680 // so that they don't get reclaimed by Redefine Classes
 681 void CompileQueue::mark_on_stack() {
 682   CompileTask* task = _first;
 683   while (task != NULL) {
 684     task->mark_on_stack();
 685     task = task->next();
 686   }
 687 }
 688 
 689 // ------------------------------------------------------------------
 690 // CompileQueue::print
 691 void CompileQueue::print() {
 692   tty->print_cr("Contents of %s", name());
 693   tty->print_cr("----------------------");
 694   CompileTask* task = _first;
 695   while (task != NULL) {
 696     task->print_line();
 697     task = task->next();
 698   }
 699   tty->print_cr("----------------------");
 700 }
 701 
 702 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 703 
 704   _current_method[0] = '\0';
 705   _compile_type = CompileBroker::no_compile;
 706 
 707   if (UsePerfData) {
 708     ResourceMark rm;
 709 
 710     // create the thread instance name space string - don't create an
 711     // instance subspace if instance is -1 - keeps the adapterThread
 712     // counters  from having a ".0" namespace.
 713     const char* thread_i = (instance == -1) ? thread_name :
 714                       PerfDataManager::name_space(thread_name, instance);
 715 
 716 
 717     char* name = PerfDataManager::counter_name(thread_i, "method");
 718     _perf_current_method =
 719                PerfDataManager::create_string_variable(SUN_CI, name,
 720                                                        cmname_buffer_length,
 721                                                        _current_method, CHECK);
 722 
 723     name = PerfDataManager::counter_name(thread_i, "type");
 724     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 725                                                           PerfData::U_None,
 726                                                          (jlong)_compile_type,
 727                                                           CHECK);
 728 
 729     name = PerfDataManager::counter_name(thread_i, "time");
 730     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 731                                                  PerfData::U_Ticks, CHECK);
 732 
 733     name = PerfDataManager::counter_name(thread_i, "compiles");
 734     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 735                                                      PerfData::U_Events, CHECK);
 736   }
 737 }
 738 
 739 // ------------------------------------------------------------------
 740 // CompileBroker::compilation_init
 741 //
 742 // Initialize the Compilation object
 743 void CompileBroker::compilation_init() {
 744   _last_method_compiled[0] = '\0';
 745 
 746 #ifndef SHARK
 747   // Set the interface to the current compiler(s).
 748   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 749   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 750 #ifdef COMPILER1
 751   if (c1_count > 0) {
 752     _compilers[0] = new Compiler();
 753   }
 754 #endif // COMPILER1
 755 
 756 #ifdef COMPILER2
 757   if (c2_count > 0) {
 758     _compilers[1] = new C2Compiler();
 759   }
 760 #endif // COMPILER2
 761 
 762 #else // SHARK
 763   int c1_count = 0;
 764   int c2_count = 1;
 765 
 766   _compilers[1] = new SharkCompiler();
 767 #endif // SHARK
 768 
 769   // Initialize the CompileTask free list
 770   _task_free_list = NULL;
 771 
 772   // Start the CompilerThreads
 773   init_compiler_threads(c1_count, c2_count);
 774   // totalTime performance counter is always created as it is required
 775   // by the implementation of java.lang.management.CompilationMBean.
 776   {
 777     EXCEPTION_MARK;
 778     _perf_total_compilation =
 779                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 780                                                  PerfData::U_Ticks, CHECK);
 781   }
 782 
 783 
 784   if (UsePerfData) {
 785 
 786     EXCEPTION_MARK;
 787 
 788     // create the jvmstat performance counters
 789     _perf_osr_compilation =
 790                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 791                                                  PerfData::U_Ticks, CHECK);
 792 
 793     _perf_standard_compilation =
 794                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 795                                                  PerfData::U_Ticks, CHECK);
 796 
 797     _perf_total_bailout_count =
 798                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 799                                                  PerfData::U_Events, CHECK);
 800 
 801     _perf_total_invalidated_count =
 802                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 803                                                  PerfData::U_Events, CHECK);
 804 
 805     _perf_total_compile_count =
 806                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 807                                                  PerfData::U_Events, CHECK);
 808     _perf_total_osr_compile_count =
 809                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 810                                                  PerfData::U_Events, CHECK);
 811 
 812     _perf_total_standard_compile_count =
 813                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 814                                                  PerfData::U_Events, CHECK);
 815 
 816     _perf_sum_osr_bytes_compiled =
 817                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 818                                                  PerfData::U_Bytes, CHECK);
 819 
 820     _perf_sum_standard_bytes_compiled =
 821                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 822                                                  PerfData::U_Bytes, CHECK);
 823 
 824     _perf_sum_nmethod_size =
 825                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 826                                                  PerfData::U_Bytes, CHECK);
 827 
 828     _perf_sum_nmethod_code_size =
 829                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 830                                                  PerfData::U_Bytes, CHECK);
 831 
 832     _perf_last_method =
 833                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 834                                        CompilerCounters::cmname_buffer_length,
 835                                        "", CHECK);
 836 
 837     _perf_last_failed_method =
 838             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 839                                        CompilerCounters::cmname_buffer_length,
 840                                        "", CHECK);
 841 
 842     _perf_last_invalidated_method =
 843         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 844                                      CompilerCounters::cmname_buffer_length,
 845                                      "", CHECK);
 846 
 847     _perf_last_compile_type =
 848              PerfDataManager::create_variable(SUN_CI, "lastType",
 849                                               PerfData::U_None,
 850                                               (jlong)CompileBroker::no_compile,
 851                                               CHECK);
 852 
 853     _perf_last_compile_size =
 854              PerfDataManager::create_variable(SUN_CI, "lastSize",
 855                                               PerfData::U_Bytes,
 856                                               (jlong)CompileBroker::no_compile,
 857                                               CHECK);
 858 
 859 
 860     _perf_last_failed_type =
 861              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 862                                               PerfData::U_None,
 863                                               (jlong)CompileBroker::no_compile,
 864                                               CHECK);
 865 
 866     _perf_last_invalidated_type =
 867          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 868                                           PerfData::U_None,
 869                                           (jlong)CompileBroker::no_compile,
 870                                           CHECK);
 871   }
 872 
 873   _initialized = true;
 874 }
 875 
 876 
 877 
 878 // ------------------------------------------------------------------
 879 // CompileBroker::make_compiler_thread
 880 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, TRAPS) {
 881   CompilerThread* compiler_thread = NULL;
 882 
 883   Klass* k =
 884     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
 885                                       true, CHECK_0);
 886   instanceKlassHandle klass (THREAD, k);
 887   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 888   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 889 
 890   // Initialize thread_oop to put it into the system threadGroup
 891   Handle thread_group (THREAD,  Universe::system_thread_group());
 892   JavaValue result(T_VOID);
 893   JavaCalls::call_special(&result, thread_oop,
 894                        klass,
 895                        vmSymbols::object_initializer_name(),
 896                        vmSymbols::threadgroup_string_void_signature(),
 897                        thread_group,
 898                        string,
 899                        CHECK_0);
 900 
 901   {
 902     MutexLocker mu(Threads_lock, THREAD);
 903     compiler_thread = new CompilerThread(queue, counters);
 904     // At this point the new CompilerThread data-races with this startup
 905     // thread (which I believe is the primoridal thread and NOT the VM
 906     // thread).  This means Java bytecodes being executed at startup can
 907     // queue compile jobs which will run at whatever default priority the
 908     // newly created CompilerThread runs at.
 909 
 910 
 911     // At this point it may be possible that no osthread was created for the
 912     // JavaThread due to lack of memory. We would have to throw an exception
 913     // in that case. However, since this must work and we do not allow
 914     // exceptions anyway, check and abort if this fails.
 915 
 916     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
 917       vm_exit_during_initialization("java.lang.OutOfMemoryError",
 918                                     "unable to create new native thread");
 919     }
 920 
 921     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
 922 
 923     // Note that this only sets the JavaThread _priority field, which by
 924     // definition is limited to Java priorities and not OS priorities.
 925     // The os-priority is set in the CompilerThread startup code itself
 926 
 927     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
 928 
 929     // Note that we cannot call os::set_priority because it expects Java
 930     // priorities and we are *explicitly* using OS priorities so that it's
 931     // possible to set the compiler thread priority higher than any Java
 932     // thread.
 933 
 934     int native_prio = CompilerThreadPriority;
 935     if (native_prio == -1) {
 936       if (UseCriticalCompilerThreadPriority) {
 937         native_prio = os::java_to_os_priority[CriticalPriority];
 938       } else {
 939         native_prio = os::java_to_os_priority[NearMaxPriority];
 940       }
 941     }
 942     os::set_native_priority(compiler_thread, native_prio);
 943 
 944     java_lang_Thread::set_daemon(thread_oop());
 945 
 946     compiler_thread->set_threadObj(thread_oop());
 947     Threads::add(compiler_thread);
 948     Thread::start(compiler_thread);
 949   }
 950 
 951   // Let go of Threads_lock before yielding
 952   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 953 
 954   return compiler_thread;
 955 }
 956 
 957 
 958 // ------------------------------------------------------------------
 959 // CompileBroker::init_compiler_threads
 960 //
 961 // Initialize the compilation queue
 962 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
 963   EXCEPTION_MARK;
 964 #if !defined(ZERO) && !defined(SHARK)
 965   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
 966 #endif // !ZERO && !SHARK
 967   if (c2_compiler_count > 0) {
 968     _c2_method_queue  = new CompileQueue("C2MethodQueue",  MethodCompileQueue_lock);
 969   }
 970   if (c1_compiler_count > 0) {
 971     _c1_method_queue  = new CompileQueue("C1MethodQueue",  MethodCompileQueue_lock);
 972   }
 973 
 974   int compiler_count = c1_compiler_count + c2_compiler_count;
 975 
 976   _method_threads =
 977     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
 978 
 979   char name_buffer[256];
 980   for (int i = 0; i < c2_compiler_count; i++) {
 981     // Create a name for our thread.
 982     sprintf(name_buffer, "C2 CompilerThread%d", i);
 983     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 984     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
 985     _method_threads->append(new_thread);
 986   }
 987 
 988   for (int i = c2_compiler_count; i < compiler_count; i++) {
 989     // Create a name for our thread.
 990     sprintf(name_buffer, "C1 CompilerThread%d", i);
 991     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
 992     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
 993     _method_threads->append(new_thread);
 994   }
 995 
 996   if (UsePerfData) {
 997     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
 998                                      compiler_count, CHECK);
 999   }
1000 }
1001 
1002 
1003 // Set the methods on the stack as on_stack so that redefine classes doesn't
1004 // reclaim them
1005 void CompileBroker::mark_on_stack() {
1006   if (_c2_method_queue != NULL) {
1007     _c2_method_queue->mark_on_stack();
1008   }
1009   if (_c1_method_queue != NULL) {
1010     _c1_method_queue->mark_on_stack();
1011   }
1012 }
1013 
1014 // ------------------------------------------------------------------
1015 // CompileBroker::is_idle
1016 bool CompileBroker::is_idle() {
1017   if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
1018     return false;
1019   } else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
1020     return false;
1021   } else {
1022     int num_threads = _method_threads->length();
1023     for (int i=0; i<num_threads; i++) {
1024       if (_method_threads->at(i)->task() != NULL) {
1025         return false;
1026       }
1027     }
1028 
1029     // No pending or active compilations.
1030     return true;
1031   }
1032 }
1033 
1034 
1035 // ------------------------------------------------------------------
1036 // CompileBroker::compile_method
1037 //
1038 // Request compilation of a method.
1039 void CompileBroker::compile_method_base(methodHandle method,
1040                                         int osr_bci,
1041                                         int comp_level,
1042                                         methodHandle hot_method,
1043                                         int hot_count,
1044                                         const char* comment,
1045                                         Thread* thread) {
1046   // do nothing if compiler thread(s) is not available
1047   if (!_initialized ) {
1048     return;
1049   }
1050 
1051   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1052   assert(method->method_holder()->oop_is_instance(),
1053          "sanity check");
1054   assert(!method->method_holder()->is_not_initialized(),
1055          "method holder must be initialized");
1056   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1057 
1058   if (CIPrintRequests) {
1059     tty->print("request: ");
1060     method->print_short_name(tty);
1061     if (osr_bci != InvocationEntryBci) {
1062       tty->print(" osr_bci: %d", osr_bci);
1063     }
1064     tty->print(" comment: %s count: %d", comment, hot_count);
1065     if (!hot_method.is_null()) {
1066       tty->print(" hot: ");
1067       if (hot_method() != method()) {
1068           hot_method->print_short_name(tty);
1069       } else {
1070         tty->print("yes");
1071       }
1072     }
1073     tty->cr();
1074   }
1075 
1076   // A request has been made for compilation.  Before we do any
1077   // real work, check to see if the method has been compiled
1078   // in the meantime with a definitive result.
1079   if (compilation_is_complete(method, osr_bci, comp_level)) {
1080     return;
1081   }
1082 
1083 #ifndef PRODUCT
1084   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1085     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1086       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1087       return;
1088     }
1089   }
1090 #endif
1091 
1092   // If this method is already in the compile queue, then
1093   // we do not block the current thread.
1094   if (compilation_is_in_queue(method, osr_bci)) {
1095     // We may want to decay our counter a bit here to prevent
1096     // multiple denied requests for compilation.  This is an
1097     // open compilation policy issue. Note: The other possibility,
1098     // in the case that this is a blocking compile request, is to have
1099     // all subsequent blocking requesters wait for completion of
1100     // ongoing compiles. Note that in this case we'll need a protocol
1101     // for freeing the associated compile tasks. [Or we could have
1102     // a single static monitor on which all these waiters sleep.]
1103     return;
1104   }
1105 
1106   // If the requesting thread is holding the pending list lock
1107   // then we just return. We can't risk blocking while holding
1108   // the pending list lock or a 3-way deadlock may occur
1109   // between the reference handler thread, a GC (instigated
1110   // by a compiler thread), and compiled method registration.
1111   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1112     return;
1113   }
1114 
1115   // Outputs from the following MutexLocker block:
1116   CompileTask* task     = NULL;
1117   bool         blocking = false;
1118   CompileQueue* queue  = compile_queue(comp_level);
1119 
1120   // Acquire our lock.
1121   {
1122     MutexLocker locker(queue->lock(), thread);
1123 
1124     // Make sure the method has not slipped into the queues since
1125     // last we checked; note that those checks were "fast bail-outs".
1126     // Here we need to be more careful, see 14012000 below.
1127     if (compilation_is_in_queue(method, osr_bci)) {
1128       return;
1129     }
1130 
1131     // We need to check again to see if the compilation has
1132     // completed.  A previous compilation may have registered
1133     // some result.
1134     if (compilation_is_complete(method, osr_bci, comp_level)) {
1135       return;
1136     }
1137 
1138     // We now know that this compilation is not pending, complete,
1139     // or prohibited.  Assign a compile_id to this compilation
1140     // and check to see if it is in our [Start..Stop) range.
1141     uint compile_id = assign_compile_id(method, osr_bci);
1142     if (compile_id == 0) {
1143       // The compilation falls outside the allowed range.
1144       return;
1145     }
1146 
1147     // Should this thread wait for completion of the compile?
1148     blocking = is_compile_blocking(method, osr_bci);
1149 
1150     // We will enter the compilation in the queue.
1151     // 14012000: Note that this sets the queued_for_compile bits in
1152     // the target method. We can now reason that a method cannot be
1153     // queued for compilation more than once, as follows:
1154     // Before a thread queues a task for compilation, it first acquires
1155     // the compile queue lock, then checks if the method's queued bits
1156     // are set or it has already been compiled. Thus there can not be two
1157     // instances of a compilation task for the same method on the
1158     // compilation queue. Consider now the case where the compilation
1159     // thread has already removed a task for that method from the queue
1160     // and is in the midst of compiling it. In this case, the
1161     // queued_for_compile bits must be set in the method (and these
1162     // will be visible to the current thread, since the bits were set
1163     // under protection of the compile queue lock, which we hold now.
1164     // When the compilation completes, the compiler thread first sets
1165     // the compilation result and then clears the queued_for_compile
1166     // bits. Neither of these actions are protected by a barrier (or done
1167     // under the protection of a lock), so the only guarantee we have
1168     // (on machines with TSO (Total Store Order)) is that these values
1169     // will update in that order. As a result, the only combinations of
1170     // these bits that the current thread will see are, in temporal order:
1171     // <RESULT, QUEUE> :
1172     //     <0, 1> : in compile queue, but not yet compiled
1173     //     <1, 1> : compiled but queue bit not cleared
1174     //     <1, 0> : compiled and queue bit cleared
1175     // Because we first check the queue bits then check the result bits,
1176     // we are assured that we cannot introduce a duplicate task.
1177     // Note that if we did the tests in the reverse order (i.e. check
1178     // result then check queued bit), we could get the result bit before
1179     // the compilation completed, and the queue bit after the compilation
1180     // completed, and end up introducing a "duplicate" (redundant) task.
1181     // In that case, the compiler thread should first check if a method
1182     // has already been compiled before trying to compile it.
1183     // NOTE: in the event that there are multiple compiler threads and
1184     // there is de-optimization/recompilation, things will get hairy,
1185     // and in that case it's best to protect both the testing (here) of
1186     // these bits, and their updating (here and elsewhere) under a
1187     // common lock.
1188     task = create_compile_task(queue,
1189                                compile_id, method,
1190                                osr_bci, comp_level,
1191                                hot_method, hot_count, comment,
1192                                blocking);
1193   }
1194 
1195   if (blocking) {
1196     wait_for_completion(task);
1197   }
1198 }
1199 
1200 
1201 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1202                                        int comp_level,
1203                                        methodHandle hot_method, int hot_count,
1204                                        const char* comment, Thread* THREAD) {
1205   // make sure arguments make sense
1206   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1207   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1208   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1209   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1210   // allow any levels for WhiteBox
1211   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1212   // return quickly if possible
1213 
1214   // lock, make sure that the compilation
1215   // isn't prohibited in a straightforward way.
1216   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1217   if (comp == NULL || !comp->can_compile_method(method) ||
1218       compilation_is_prohibited(method, osr_bci, comp_level)) {
1219     return NULL;
1220   }
1221 
1222   if (osr_bci == InvocationEntryBci) {
1223     // standard compilation
1224     nmethod* method_code = method->code();
1225     if (method_code != NULL) {
1226       if (compilation_is_complete(method, osr_bci, comp_level)) {
1227         return method_code;
1228       }
1229     }
1230     if (method->is_not_compilable(comp_level)) return NULL;
1231 
1232     if (UseCodeCacheFlushing) {
1233       nmethod* saved = CodeCache::reanimate_saved_code(method());
1234       if (saved != NULL) {
1235         method->set_code(method, saved);
1236         return saved;
1237       }
1238     }
1239 
1240   } else {
1241     // osr compilation
1242 #ifndef TIERED
1243     // seems like an assert of dubious value
1244     assert(comp_level == CompLevel_highest_tier,
1245            "all OSR compiles are assumed to be at a single compilation lavel");
1246 #endif // TIERED
1247     // We accept a higher level osr method
1248     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1249     if (nm != NULL) return nm;
1250     if (method->is_not_osr_compilable(comp_level)) return NULL;
1251   }
1252 
1253   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1254   // some prerequisites that are compiler specific
1255   if (comp->is_c2() || comp->is_shark()) {
1256     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1257     // Resolve all classes seen in the signature of the method
1258     // we are compiling.
1259     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1260   }
1261 
1262   // If the method is native, do the lookup in the thread requesting
1263   // the compilation. Native lookups can load code, which is not
1264   // permitted during compilation.
1265   //
1266   // Note: A native method implies non-osr compilation which is
1267   //       checked with an assertion at the entry of this method.
1268   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1269     bool in_base_library;
1270     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1271     if (HAS_PENDING_EXCEPTION) {
1272       // In case of an exception looking up the method, we just forget
1273       // about it. The interpreter will kick-in and throw the exception.
1274       method->set_not_compilable(); // implies is_not_osr_compilable()
1275       CLEAR_PENDING_EXCEPTION;
1276       return NULL;
1277     }
1278     assert(method->has_native_function(), "must have native code by now");
1279   }
1280 
1281   // RedefineClasses() has replaced this method; just return
1282   if (method->is_old()) {
1283     return NULL;
1284   }
1285 
1286   // JVMTI -- post_compile_event requires jmethod_id() that may require
1287   // a lock the compiling thread can not acquire. Prefetch it here.
1288   if (JvmtiExport::should_post_compiled_method_load()) {
1289     method->jmethod_id();
1290   }
1291 
1292   // If the compiler is shut off due to code cache getting full
1293   // fail out now so blocking compiles dont hang the java thread
1294   if (!should_compile_new_jobs()) {
1295     CompilationPolicy::policy()->delay_compilation(method());
1296     return NULL;
1297   }
1298 
1299   // do the compilation
1300   if (method->is_native()) {
1301     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1302       // Acquire our lock.
1303       int compile_id;
1304       {
1305         MutexLocker locker(MethodCompileQueue_lock, THREAD);
1306         compile_id = assign_compile_id(method, standard_entry_bci);
1307       }
1308       (void) AdapterHandlerLibrary::create_native_wrapper(method, compile_id);
1309     } else {
1310       return NULL;
1311     }
1312   } else {
1313     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1314   }
1315 
1316   // return requested nmethod
1317   // We accept a higher level osr method
1318   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1319 }
1320 
1321 
1322 // ------------------------------------------------------------------
1323 // CompileBroker::compilation_is_complete
1324 //
1325 // See if compilation of this method is already complete.
1326 bool CompileBroker::compilation_is_complete(methodHandle method,
1327                                             int          osr_bci,
1328                                             int          comp_level) {
1329   bool is_osr = (osr_bci != standard_entry_bci);
1330   if (is_osr) {
1331     if (method->is_not_osr_compilable(comp_level)) {
1332       return true;
1333     } else {
1334       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1335       return (result != NULL);
1336     }
1337   } else {
1338     if (method->is_not_compilable(comp_level)) {
1339       return true;
1340     } else {
1341       nmethod* result = method->code();
1342       if (result == NULL) return false;
1343       return comp_level == result->comp_level();
1344     }
1345   }
1346 }
1347 
1348 
1349 // ------------------------------------------------------------------
1350 // CompileBroker::compilation_is_in_queue
1351 //
1352 // See if this compilation is already requested.
1353 //
1354 // Implementation note: there is only a single "is in queue" bit
1355 // for each method.  This means that the check below is overly
1356 // conservative in the sense that an osr compilation in the queue
1357 // will block a normal compilation from entering the queue (and vice
1358 // versa).  This can be remedied by a full queue search to disambiguate
1359 // cases.  If it is deemed profitible, this may be done.
1360 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1361                                             int          osr_bci) {
1362   return method->queued_for_compilation();
1363 }
1364 
1365 // ------------------------------------------------------------------
1366 // CompileBroker::compilation_is_prohibited
1367 //
1368 // See if this compilation is not allowed.
1369 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1370   bool is_native = method->is_native();
1371   // Some compilers may not support the compilation of natives.
1372   AbstractCompiler *comp = compiler(comp_level);
1373   if (is_native &&
1374       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1375     method->set_not_compilable_quietly(comp_level);
1376     return true;
1377   }
1378 
1379   bool is_osr = (osr_bci != standard_entry_bci);
1380   // Some compilers may not support on stack replacement.
1381   if (is_osr &&
1382       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1383     method->set_not_osr_compilable(comp_level);
1384     return true;
1385   }
1386 
1387   // The method may be explicitly excluded by the user.
1388   bool quietly;
1389   if (CompilerOracle::should_exclude(method, quietly)) {
1390     if (!quietly) {
1391       // This does not happen quietly...
1392       ResourceMark rm;
1393       tty->print("### Excluding %s:%s",
1394                  method->is_native() ? "generation of native wrapper" : "compile",
1395                  (method->is_static() ? " static" : ""));
1396       method->print_short_name(tty);
1397       tty->cr();
1398     }
1399     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1400   }
1401 
1402   return false;
1403 }
1404 
1405 
1406 // ------------------------------------------------------------------
1407 // CompileBroker::assign_compile_id
1408 //
1409 // Assign a serialized id number to this compilation request.  If the
1410 // number falls out of the allowed range, return a 0.  OSR
1411 // compilations may be numbered separately from regular compilations
1412 // if certain debugging flags are used.
1413 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1414   assert(MethodCompileQueue_lock->owner() == Thread::current(),
1415          "must hold the compilation queue lock");
1416   bool is_osr = (osr_bci != standard_entry_bci);
1417   uint id;
1418   if (CICountOSR && is_osr) {
1419     id = ++_osr_compilation_id;
1420     if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1421       return id;
1422     }
1423   } else {
1424     id = ++_compilation_id;
1425     if ((uint)CIStart <= id && id < (uint)CIStop) {
1426       return id;
1427     }
1428   }
1429 
1430   // Method was not in the appropriate compilation range.
1431   method->set_not_compilable_quietly();
1432   return 0;
1433 }
1434 
1435 
1436 // ------------------------------------------------------------------
1437 // CompileBroker::is_compile_blocking
1438 //
1439 // Should the current thread be blocked until this compilation request
1440 // has been fulfilled?
1441 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1442   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1443   return !BackgroundCompilation;
1444 }
1445 
1446 
1447 // ------------------------------------------------------------------
1448 // CompileBroker::preload_classes
1449 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1450   // Move this code over from c1_Compiler.cpp
1451   ShouldNotReachHere();
1452 }
1453 
1454 
1455 // ------------------------------------------------------------------
1456 // CompileBroker::create_compile_task
1457 //
1458 // Create a CompileTask object representing the current request for
1459 // compilation.  Add this task to the queue.
1460 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1461                                               int           compile_id,
1462                                               methodHandle  method,
1463                                               int           osr_bci,
1464                                               int           comp_level,
1465                                               methodHandle  hot_method,
1466                                               int           hot_count,
1467                                               const char*   comment,
1468                                               bool          blocking) {
1469   CompileTask* new_task = allocate_task();
1470   new_task->initialize(compile_id, method, osr_bci, comp_level,
1471                        hot_method, hot_count, comment,
1472                        blocking);
1473   queue->add(new_task);
1474   return new_task;
1475 }
1476 
1477 
1478 // ------------------------------------------------------------------
1479 // CompileBroker::allocate_task
1480 //
1481 // Allocate a CompileTask, from the free list if possible.
1482 CompileTask* CompileBroker::allocate_task() {
1483   MutexLocker locker(CompileTaskAlloc_lock);
1484   CompileTask* task = NULL;
1485   if (_task_free_list != NULL) {
1486     task = _task_free_list;
1487     _task_free_list = task->next();
1488     task->set_next(NULL);
1489   } else {
1490     task = new CompileTask();
1491     task->set_next(NULL);
1492   }
1493   return task;
1494 }
1495 
1496 
1497 // ------------------------------------------------------------------
1498 // CompileBroker::free_task
1499 //
1500 // Add a task to the free list.
1501 void CompileBroker::free_task(CompileTask* task) {
1502   MutexLocker locker(CompileTaskAlloc_lock);
1503   task->free();
1504   task->set_next(_task_free_list);
1505   _task_free_list = task;
1506 }
1507 
1508 
1509 // ------------------------------------------------------------------
1510 // CompileBroker::wait_for_completion
1511 //
1512 // Wait for the given method CompileTask to complete.
1513 void CompileBroker::wait_for_completion(CompileTask* task) {
1514   if (CIPrintCompileQueue) {
1515     tty->print_cr("BLOCKING FOR COMPILE");
1516   }
1517 
1518   assert(task->is_blocking(), "can only wait on blocking task");
1519 
1520   JavaThread *thread = JavaThread::current();
1521   thread->set_blocked_on_compilation(true);
1522 
1523   methodHandle method(thread, task->method());
1524   {
1525     MutexLocker waiter(task->lock(), thread);
1526 
1527     while (!task->is_complete())
1528       task->lock()->wait();
1529   }
1530   // It is harmless to check this status without the lock, because
1531   // completion is a stable property (until the task object is recycled).
1532   assert(task->is_complete(), "Compilation should have completed");
1533   assert(task->code_handle() == NULL, "must be reset");
1534 
1535   thread->set_blocked_on_compilation(false);
1536 
1537   // By convention, the waiter is responsible for recycling a
1538   // blocking CompileTask. Since there is only one waiter ever
1539   // waiting on a CompileTask, we know that no one else will
1540   // be using this CompileTask; we can free it.
1541   free_task(task);
1542 }
1543 
1544 // ------------------------------------------------------------------
1545 // CompileBroker::compiler_thread_loop
1546 //
1547 // The main loop run by a CompilerThread.
1548 void CompileBroker::compiler_thread_loop() {
1549   CompilerThread* thread = CompilerThread::current();
1550   CompileQueue* queue = thread->queue();
1551 
1552   // For the thread that initializes the ciObjectFactory
1553   // this resource mark holds all the shared objects
1554   ResourceMark rm;
1555 
1556   // First thread to get here will initialize the compiler interface
1557 
1558   if (!ciObjectFactory::is_initialized()) {
1559     ASSERT_IN_VM;
1560     MutexLocker only_one (CompileThread_lock, thread);
1561     if (!ciObjectFactory::is_initialized()) {
1562       ciObjectFactory::initialize();
1563     }
1564   }
1565 
1566   // Open a log.
1567   if (LogCompilation) {
1568     init_compiler_thread_log();
1569   }
1570   CompileLog* log = thread->log();
1571   if (log != NULL) {
1572     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1573                     thread->name(),
1574                     os::current_thread_id(),
1575                     os::current_process_id());
1576     log->stamp();
1577     log->end_elem();
1578   }
1579 
1580   while (true) {
1581     {
1582       // We need this HandleMark to avoid leaking VM handles.
1583       HandleMark hm(thread);
1584 
1585       if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1586         // the code cache is really full
1587         handle_full_code_cache();
1588       } else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
1589         // Attempt to start cleaning the code cache while there is still a little headroom
1590         NMethodSweeper::handle_full_code_cache(false);
1591       }
1592 
1593       CompileTask* task = queue->get();
1594 
1595       // Give compiler threads an extra quanta.  They tend to be bursty and
1596       // this helps the compiler to finish up the job.
1597       if( CompilerThreadHintNoPreempt )
1598         os::hint_no_preempt();
1599 
1600       // trace per thread time and compile statistics
1601       CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1602       PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1603 
1604       // Assign the task to the current thread.  Mark this compilation
1605       // thread as active for the profiler.
1606       CompileTaskWrapper ctw(task);
1607       nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1608       task->set_code_handle(&result_handle);
1609       methodHandle method(thread, task->method());
1610 
1611       // Never compile a method if breakpoints are present in it
1612       if (method()->number_of_breakpoints() == 0) {
1613         // Compile the method.
1614         if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1615 #ifdef COMPILER1
1616           // Allow repeating compilations for the purpose of benchmarking
1617           // compile speed. This is not useful for customers.
1618           if (CompilationRepeat != 0) {
1619             int compile_count = CompilationRepeat;
1620             while (compile_count > 0) {
1621               invoke_compiler_on_method(task);
1622               nmethod* nm = method->code();
1623               if (nm != NULL) {
1624                 nm->make_zombie();
1625                 method->clear_code();
1626               }
1627               compile_count--;
1628             }
1629           }
1630 #endif /* COMPILER1 */
1631           invoke_compiler_on_method(task);
1632         } else {
1633           // After compilation is disabled, remove remaining methods from queue
1634           method->clear_queued_for_compilation();
1635         }
1636       }
1637     }
1638   }
1639 }
1640 
1641 
1642 // ------------------------------------------------------------------
1643 // CompileBroker::init_compiler_thread_log
1644 //
1645 // Set up state required by +LogCompilation.
1646 void CompileBroker::init_compiler_thread_log() {
1647     CompilerThread* thread = CompilerThread::current();
1648     char  fileBuf[4*K];
1649     FILE* fp = NULL;
1650     char* file = NULL;
1651     intx thread_id = os::current_thread_id();
1652     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1653       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1654       if (dir == NULL) {
1655         jio_snprintf(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
1656                      thread_id, os::current_process_id());
1657       } else {
1658         jio_snprintf(fileBuf, sizeof(fileBuf),
1659                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1660                      os::file_separator(), thread_id, os::current_process_id());
1661       }
1662       fp = fopen(fileBuf, "at");
1663       if (fp != NULL) {
1664         file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1, mtCompiler);
1665         strcpy(file, fileBuf);
1666         break;
1667       }
1668     }
1669     if (fp == NULL) {
1670       warning("Cannot open log file: %s", fileBuf);
1671     } else {
1672       if (LogCompilation && Verbose)
1673         tty->print_cr("Opening compilation log %s", file);
1674       CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file, fp, thread_id);
1675       thread->init_log(log);
1676 
1677       if (xtty != NULL) {
1678         ttyLocker ttyl;
1679 
1680         // Record any per thread log files
1681         xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file);
1682       }
1683     }
1684 }
1685 
1686 // ------------------------------------------------------------------
1687 // CompileBroker::set_should_block
1688 //
1689 // Set _should_block.
1690 // Call this from the VM, with Threads_lock held and a safepoint requested.
1691 void CompileBroker::set_should_block() {
1692   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1693   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1694 #ifndef PRODUCT
1695   if (PrintCompilation && (Verbose || WizardMode))
1696     tty->print_cr("notifying compiler thread pool to block");
1697 #endif
1698   _should_block = true;
1699 }
1700 
1701 // ------------------------------------------------------------------
1702 // CompileBroker::maybe_block
1703 //
1704 // Call this from the compiler at convenient points, to poll for _should_block.
1705 void CompileBroker::maybe_block() {
1706   if (_should_block) {
1707 #ifndef PRODUCT
1708     if (PrintCompilation && (Verbose || WizardMode))
1709       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1710 #endif
1711     ThreadInVMfromNative tivfn(JavaThread::current());
1712   }
1713 }
1714 
1715 // wrapper for CodeCache::print_summary()
1716 static void codecache_print(bool detailed)
1717 {
1718   ResourceMark rm;
1719   stringStream s;
1720   // Dump code cache  into a buffer before locking the tty,
1721   {
1722     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1723     CodeCache::print_summary(&s, detailed);
1724   }
1725   ttyLocker ttyl;
1726   tty->print_cr(s.as_string());
1727 }
1728 
1729 // ------------------------------------------------------------------
1730 // CompileBroker::invoke_compiler_on_method
1731 //
1732 // Compile a method.
1733 //
1734 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1735   if (PrintCompilation) {
1736     ResourceMark rm;
1737     task->print_line();
1738   }
1739   elapsedTimer time;
1740 
1741   CompilerThread* thread = CompilerThread::current();
1742   ResourceMark rm(thread);
1743 
1744   if (LogEvents) {
1745     _compilation_log->log_compile(thread, task);
1746   }
1747 
1748   // Common flags.
1749   uint compile_id = task->compile_id();
1750   int osr_bci = task->osr_bci();
1751   bool is_osr = (osr_bci != standard_entry_bci);
1752   bool should_log = (thread->log() != NULL);
1753   bool should_break = false;
1754   int task_level = task->comp_level();
1755   {
1756     // create the handle inside it's own block so it can't
1757     // accidentally be referenced once the thread transitions to
1758     // native.  The NoHandleMark before the transition should catch
1759     // any cases where this occurs in the future.
1760     methodHandle method(thread, task->method());
1761     should_break = check_break_at(method, compile_id, is_osr);
1762     if (should_log && !CompilerOracle::should_log(method)) {
1763       should_log = false;
1764     }
1765     assert(!method->is_native(), "no longer compile natives");
1766 
1767     // Save information about this method in case of failure.
1768     set_last_compile(thread, method, is_osr, task_level);
1769 
1770     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1771   }
1772 
1773   // Allocate a new set of JNI handles.
1774   push_jni_handle_block();
1775   Method* target_handle = task->method();
1776   int compilable = ciEnv::MethodCompilable;
1777   {
1778     int system_dictionary_modification_counter;
1779     {
1780       MutexLocker locker(Compile_lock, thread);
1781       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1782     }
1783 
1784     NoHandleMark  nhm;
1785     ThreadToNativeFromVM ttn(thread);
1786 
1787     ciEnv ci_env(task, system_dictionary_modification_counter);
1788     if (should_break) {
1789       ci_env.set_break_at_compile(true);
1790     }
1791     if (should_log) {
1792       ci_env.set_log(thread->log());
1793     }
1794     assert(thread->env() == &ci_env, "set by ci_env");
1795     // The thread-env() field is cleared in ~CompileTaskWrapper.
1796 
1797     // Cache Jvmti state
1798     ci_env.cache_jvmti_state();
1799 
1800     // Cache DTrace flags
1801     ci_env.cache_dtrace_flags();
1802 
1803     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1804 
1805     TraceTime t1("compilation", &time);
1806     EventCompilation event;
1807 
1808     AbstractCompiler *comp = compiler(task_level);
1809     if (comp == NULL) {
1810       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1811     } else {
1812       comp->compile_method(&ci_env, target, osr_bci);
1813     }
1814 
1815     if (!ci_env.failing() && task->code() == NULL) {
1816       //assert(false, "compiler should always document failure");
1817       // The compiler elected, without comment, not to register a result.
1818       // Do not attempt further compilations of this method.
1819       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1820     }
1821 
1822     // Copy this bit to the enclosing block:
1823     compilable = ci_env.compilable();
1824 
1825     if (ci_env.failing()) {
1826       const char* retry_message = ci_env.retry_message();
1827       if (_compilation_log != NULL) {
1828         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1829       }
1830       if (PrintCompilation) {
1831         FormatBufferResource msg = retry_message != NULL ?
1832             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1833             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1834         task->print_compilation(tty, msg);
1835       }
1836     } else {
1837       task->mark_success();
1838       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1839       if (_compilation_log != NULL) {
1840         nmethod* code = task->code();
1841         if (code != NULL) {
1842           _compilation_log->log_nmethod(thread, code);
1843         }
1844       }
1845     }
1846     // simulate crash during compilation
1847     assert(task->compile_id() != CICrashAt, "just as planned");
1848     if (event.should_commit()) {
1849       event.set_method(target->get_Method());
1850       event.set_compileID(compile_id);
1851       event.set_compileLevel(task->comp_level());
1852       event.set_succeded(task->is_success());
1853       event.set_isOsr(is_osr);
1854       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1855       event.set_inlinedBytes(task->num_inlined_bytecodes());
1856       event.commit();
1857     }
1858   }
1859   pop_jni_handle_block();
1860 
1861   methodHandle method(thread, task->method());
1862 
1863   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1864 
1865   collect_statistics(thread, time, task);
1866 
1867   if (PrintCompilation && PrintCompilation2) {
1868     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
1869     tty->print("%4d ", compile_id);    // print compilation number
1870     tty->print("%s ", (is_osr ? "%" : " "));
1871     if (task->code() != NULL) {
1872       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1873     }
1874     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1875   }
1876 
1877   if (PrintCodeCacheOnCompilation)
1878     codecache_print(/* detailed= */ false);
1879 
1880   // Disable compilation, if required.
1881   switch (compilable) {
1882   case ciEnv::MethodCompilable_never:
1883     if (is_osr)
1884       method->set_not_osr_compilable_quietly();
1885     else
1886       method->set_not_compilable_quietly();
1887     break;
1888   case ciEnv::MethodCompilable_not_at_tier:
1889     if (is_osr)
1890       method->set_not_osr_compilable_quietly(task_level);
1891     else
1892       method->set_not_compilable_quietly(task_level);
1893     break;
1894   }
1895 
1896   // Note that the queued_for_compilation bits are cleared without
1897   // protection of a mutex. [They were set by the requester thread,
1898   // when adding the task to the complie queue -- at which time the
1899   // compile queue lock was held. Subsequently, we acquired the compile
1900   // queue lock to get this task off the compile queue; thus (to belabour
1901   // the point somewhat) our clearing of the bits must be occurring
1902   // only after the setting of the bits. See also 14012000 above.
1903   method->clear_queued_for_compilation();
1904 
1905 #ifdef ASSERT
1906   if (CollectedHeap::fired_fake_oom()) {
1907     // The current compile received a fake OOM during compilation so
1908     // go ahead and exit the VM since the test apparently succeeded
1909     tty->print_cr("*** Shutting down VM after successful fake OOM");
1910     vm_exit(0);
1911   }
1912 #endif
1913 }
1914 
1915 // ------------------------------------------------------------------
1916 // CompileBroker::handle_full_code_cache
1917 //
1918 // The CodeCache is full.  Print out warning and disable compilation or
1919 // try code cache cleaning so compilation can continue later.
1920 void CompileBroker::handle_full_code_cache() {
1921   UseInterpreter = true;
1922   if (UseCompiler || AlwaysCompileLoopMethods ) {
1923     if (xtty != NULL) {
1924       ResourceMark rm;
1925       stringStream s;
1926       // Dump code cache state into a buffer before locking the tty,
1927       // because log_state() will use locks causing lock conflicts.
1928       CodeCache::log_state(&s);
1929       // Lock to prevent tearing
1930       ttyLocker ttyl;
1931       xtty->begin_elem("code_cache_full");
1932       xtty->print(s.as_string());
1933       xtty->stamp();
1934       xtty->end_elem();
1935     }
1936     warning("CodeCache is full. Compiler has been disabled.");
1937     warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
1938 
1939     CodeCache::report_codemem_full();
1940 
1941 
1942 #ifndef PRODUCT
1943     if (CompileTheWorld || ExitOnFullCodeCache) {
1944       codecache_print(/* detailed= */ true);
1945       before_exit(JavaThread::current());
1946       exit_globals(); // will delete tty
1947       vm_direct_exit(CompileTheWorld ? 0 : 1);
1948     }
1949 #endif
1950     if (UseCodeCacheFlushing) {
1951       NMethodSweeper::handle_full_code_cache(true);
1952     } else {
1953       UseCompiler               = false;
1954       AlwaysCompileLoopMethods  = false;
1955     }
1956   }
1957   codecache_print(/* detailed= */ true);
1958 }
1959 
1960 // ------------------------------------------------------------------
1961 // CompileBroker::set_last_compile
1962 //
1963 // Record this compilation for debugging purposes.
1964 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
1965   ResourceMark rm;
1966   char* method_name = method->name()->as_C_string();
1967   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
1968   char current_method[CompilerCounters::cmname_buffer_length];
1969   size_t maxLen = CompilerCounters::cmname_buffer_length;
1970 
1971   if (UsePerfData) {
1972     const char* class_name = method->method_holder()->name()->as_C_string();
1973 
1974     size_t s1len = strlen(class_name);
1975     size_t s2len = strlen(method_name);
1976 
1977     // check if we need to truncate the string
1978     if (s1len + s2len + 2 > maxLen) {
1979 
1980       // the strategy is to lop off the leading characters of the
1981       // class name and the trailing characters of the method name.
1982 
1983       if (s2len + 2 > maxLen) {
1984         // lop of the entire class name string, let snprintf handle
1985         // truncation of the method name.
1986         class_name += s1len; // null string
1987       }
1988       else {
1989         // lop off the extra characters from the front of the class name
1990         class_name += ((s1len + s2len + 2) - maxLen);
1991       }
1992     }
1993 
1994     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
1995   }
1996 
1997   if (CICountOSR && is_osr) {
1998     _last_compile_type = osr_compile;
1999   } else {
2000     _last_compile_type = normal_compile;
2001   }
2002   _last_compile_level = comp_level;
2003 
2004   if (UsePerfData) {
2005     CompilerCounters* counters = thread->counters();
2006     counters->set_current_method(current_method);
2007     counters->set_compile_type((jlong)_last_compile_type);
2008   }
2009 }
2010 
2011 
2012 // ------------------------------------------------------------------
2013 // CompileBroker::push_jni_handle_block
2014 //
2015 // Push on a new block of JNI handles.
2016 void CompileBroker::push_jni_handle_block() {
2017   JavaThread* thread = JavaThread::current();
2018 
2019   // Allocate a new block for JNI handles.
2020   // Inlined code from jni_PushLocalFrame()
2021   JNIHandleBlock* java_handles = thread->active_handles();
2022   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2023   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2024   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2025   thread->set_active_handles(compile_handles);
2026 }
2027 
2028 
2029 // ------------------------------------------------------------------
2030 // CompileBroker::pop_jni_handle_block
2031 //
2032 // Pop off the current block of JNI handles.
2033 void CompileBroker::pop_jni_handle_block() {
2034   JavaThread* thread = JavaThread::current();
2035 
2036   // Release our JNI handle block
2037   JNIHandleBlock* compile_handles = thread->active_handles();
2038   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2039   thread->set_active_handles(java_handles);
2040   compile_handles->set_pop_frame_link(NULL);
2041   JNIHandleBlock::release_block(compile_handles, thread); // may block
2042 }
2043 
2044 
2045 // ------------------------------------------------------------------
2046 // CompileBroker::check_break_at
2047 //
2048 // Should the compilation break at the current compilation.
2049 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2050   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2051     return true;
2052   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2053     return true;
2054   } else {
2055     return (compile_id == CIBreakAt);
2056   }
2057 }
2058 
2059 // ------------------------------------------------------------------
2060 // CompileBroker::collect_statistics
2061 //
2062 // Collect statistics about the compilation.
2063 
2064 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2065   bool success = task->is_success();
2066   methodHandle method (thread, task->method());
2067   uint compile_id = task->compile_id();
2068   bool is_osr = (task->osr_bci() != standard_entry_bci);
2069   nmethod* code = task->code();
2070   CompilerCounters* counters = thread->counters();
2071 
2072   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2073   MutexLocker locker(CompileStatistics_lock);
2074 
2075   // _perf variables are production performance counters which are
2076   // updated regardless of the setting of the CITime and CITimeEach flags
2077   //
2078   if (!success) {
2079     _total_bailout_count++;
2080     if (UsePerfData) {
2081       _perf_last_failed_method->set_value(counters->current_method());
2082       _perf_last_failed_type->set_value(counters->compile_type());
2083       _perf_total_bailout_count->inc();
2084     }
2085   } else if (code == NULL) {
2086     if (UsePerfData) {
2087       _perf_last_invalidated_method->set_value(counters->current_method());
2088       _perf_last_invalidated_type->set_value(counters->compile_type());
2089       _perf_total_invalidated_count->inc();
2090     }
2091     _total_invalidated_count++;
2092   } else {
2093     // Compilation succeeded
2094 
2095     // update compilation ticks - used by the implementation of
2096     // java.lang.management.CompilationMBean
2097     _perf_total_compilation->inc(time.ticks());
2098 
2099     _t_total_compilation.add(time);
2100     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2101 
2102     if (CITime) {
2103       if (is_osr) {
2104         _t_osr_compilation.add(time);
2105         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2106       } else {
2107         _t_standard_compilation.add(time);
2108         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2109       }
2110     }
2111 
2112     if (UsePerfData) {
2113       // save the name of the last method compiled
2114       _perf_last_method->set_value(counters->current_method());
2115       _perf_last_compile_type->set_value(counters->compile_type());
2116       _perf_last_compile_size->set_value(method->code_size() +
2117                                          task->num_inlined_bytecodes());
2118       if (is_osr) {
2119         _perf_osr_compilation->inc(time.ticks());
2120         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2121       } else {
2122         _perf_standard_compilation->inc(time.ticks());
2123         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2124       }
2125     }
2126 
2127     if (CITimeEach) {
2128       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2129       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2130                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2131     }
2132 
2133     // Collect counts of successful compilations
2134     _sum_nmethod_size      += code->total_size();
2135     _sum_nmethod_code_size += code->insts_size();
2136     _total_compile_count++;
2137 
2138     if (UsePerfData) {
2139       _perf_sum_nmethod_size->inc(     code->total_size());
2140       _perf_sum_nmethod_code_size->inc(code->insts_size());
2141       _perf_total_compile_count->inc();
2142     }
2143 
2144     if (is_osr) {
2145       if (UsePerfData) _perf_total_osr_compile_count->inc();
2146       _total_osr_compile_count++;
2147     } else {
2148       if (UsePerfData) _perf_total_standard_compile_count->inc();
2149       _total_standard_compile_count++;
2150     }
2151   }
2152   // set the current method for the thread to null
2153   if (UsePerfData) counters->set_current_method("");
2154 }
2155 
2156 const char* CompileBroker::compiler_name(int comp_level) {
2157   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2158   if (comp == NULL) {
2159     return "no compiler";
2160   } else {
2161     return (comp->name());
2162   }
2163 }
2164 
2165 void CompileBroker::print_times() {
2166   tty->cr();
2167   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2168   tty->print_cr("------------------------------------------------");
2169                //0000000000111111111122222222223333333333444444444455555555556666666666
2170                //0123456789012345678901234567890123456789012345678901234567890123456789
2171   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2172   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2173                 CompileBroker::_t_standard_compilation.seconds(),
2174                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2175   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);
2176 
2177   AbstractCompiler *comp = compiler(CompLevel_simple);
2178   if (comp != NULL) {
2179     comp->print_timers();
2180   }
2181   comp = compiler(CompLevel_full_optimization);
2182   if (comp != NULL) {
2183     comp->print_timers();
2184   }
2185   tty->cr();
2186   tty->print_cr("  Total compiled methods   : %6d methods", CompileBroker::_total_compile_count);
2187   tty->print_cr("    Standard compilation   : %6d methods", CompileBroker::_total_standard_compile_count);
2188   tty->print_cr("    On stack replacement   : %6d methods", CompileBroker::_total_osr_compile_count);
2189   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2190   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2191   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2192   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2193   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2194   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2195   tty->cr();
2196   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2197   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2198 }
2199 
2200 // Debugging output for failure
2201 void CompileBroker::print_last_compile() {
2202   if ( _last_compile_level != CompLevel_none &&
2203        compiler(_last_compile_level) != NULL &&
2204        _last_method_compiled != NULL &&
2205        _last_compile_type != no_compile) {
2206     if (_last_compile_type == osr_compile) {
2207       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2208                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2209     } else {
2210       tty->print_cr("Last parse:  %d+++(%d) %s",
2211                     _compilation_id, _last_compile_level, _last_method_compiled);
2212     }
2213   }
2214 }
2215 
2216 
2217 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2218 #ifndef PRODUCT
2219   st->print_cr("Compiler thread printing unimplemented.");
2220   st->cr();
2221 #endif
2222 }