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::_compiler_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 // Add a CompileTask to a CompileQueue
 591 void CompileQueue::add(CompileTask* task) {
 592   assert(lock()->owned_by_self(), "must own lock");
 593 
 594   task->set_next(NULL);
 595   task->set_prev(NULL);
 596 
 597   if (_last == NULL) {
 598     // The compile queue is empty.
 599     assert(_first == NULL, "queue is empty");
 600     _first = task;
 601     _last = task;
 602   } else {
 603     // Append the task to the queue.
 604     assert(_last->next() == NULL, "not last");
 605     _last->set_next(task);
 606     task->set_prev(_last);
 607     _last = task;
 608   }
 609   ++_size;
 610 
 611   // Mark the method as being in the compile queue.
 612   task->method()->set_queued_for_compilation();
 613 
 614   if (CIPrintCompileQueue) {
 615     print();
 616   }
 617 
 618   if (LogCompilation && xtty != NULL) {
 619     task->log_task_queued();
 620   }
 621 
 622   // Notify CompilerThreads that a task is available.
 623   lock()->notify_all();
 624 }
 625 
 626 void CompileQueue::delete_all() {
 627   assert(lock()->owned_by_self(), "must own lock");
 628   if (_first != NULL) {
 629     for (CompileTask* task = _first; task != NULL; task = task->next()) {
 630       delete task;
 631     }
 632   _first = NULL;
 633   }
 634 }
 635 
 636 // ------------------------------------------------------------------
 637 // CompileQueue::get
 638 //
 639 // Get the next CompileTask from a CompileQueue
 640 CompileTask* CompileQueue::get() {
 641   NMethodSweeper::possibly_sweep();
 642 
 643   MutexLocker locker(lock());
 644   // If _first is NULL we have no more compile jobs. There are two reasons for
 645   // having no compile jobs: First, we compiled everything we wanted. Second,
 646   // we ran out of code cache so compilation has been disabled. In the latter
 647   // case we perform code cache sweeps to free memory such that we can re-enable
 648   // compilation.
 649   while (_first == NULL) {
 650     // Exit loop if compilation is disabled forever
 651     if (CompileBroker::is_compilation_disabled_forever()) {
 652       return NULL;
 653     }
 654 
 655     if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
 656       // Wait a certain amount of time to possibly do another sweep.
 657       // We must wait until stack scanning has happened so that we can
 658       // transition a method's state from 'not_entrant' to 'zombie'.
 659       long wait_time = NmethodSweepCheckInterval * 1000;
 660       if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
 661         // Only one thread at a time can do sweeping. Scale the
 662         // wait time according to the number of compiler threads.
 663         // As a result, the next sweep is likely to happen every 100ms
 664         // with an arbitrary number of threads that do sweeping.
 665         wait_time = 100 * CICompilerCount;
 666       }
 667       bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
 668       if (timeout) {
 669         MutexUnlocker ul(lock());
 670         NMethodSweeper::possibly_sweep();
 671       }
 672     } else {
 673       // If there are no compilation tasks and we can compile new jobs
 674       // (i.e., there is enough free space in the code cache) there is
 675       // no need to invoke the sweeper. As a result, the hotness of methods
 676       // remains unchanged. This behavior is desired, since we want to keep
 677       // the stable state, i.e., we do not want to evict methods from the
 678       // code cache if it is unnecessary.
 679       lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 680     }
 681   }
 682 
 683   if (CompileBroker::is_compilation_disabled_forever()) {
 684     return NULL;
 685   }
 686 
 687   CompileTask* task = CompilationPolicy::policy()->select_task(this);
 688   remove(task);
 689   return task;
 690 }
 691 
 692 void CompileQueue::remove(CompileTask* task)
 693 {
 694    assert(lock()->owned_by_self(), "must own lock");
 695   if (task->prev() != NULL) {
 696     task->prev()->set_next(task->next());
 697   } else {
 698     // max is the first element
 699     assert(task == _first, "Sanity");
 700     _first = task->next();
 701   }
 702 
 703   if (task->next() != NULL) {
 704     task->next()->set_prev(task->prev());
 705   } else {
 706     // max is the last element
 707     assert(task == _last, "Sanity");
 708     _last = task->prev();
 709   }
 710   --_size;
 711 }
 712 
 713 // methods in the compile queue need to be marked as used on the stack
 714 // so that they don't get reclaimed by Redefine Classes
 715 void CompileQueue::mark_on_stack() {
 716   CompileTask* task = _first;
 717   while (task != NULL) {
 718     task->mark_on_stack();
 719     task = task->next();
 720   }
 721 }
 722 
 723 // ------------------------------------------------------------------
 724 // CompileQueue::print
 725 void CompileQueue::print() {
 726   tty->print_cr("Contents of %s", name());
 727   tty->print_cr("----------------------");
 728   CompileTask* task = _first;
 729   while (task != NULL) {
 730     task->print_line();
 731     task = task->next();
 732   }
 733   tty->print_cr("----------------------");
 734 }
 735 
 736 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 737 
 738   _current_method[0] = '\0';
 739   _compile_type = CompileBroker::no_compile;
 740 
 741   if (UsePerfData) {
 742     ResourceMark rm;
 743 
 744     // create the thread instance name space string - don't create an
 745     // instance subspace if instance is -1 - keeps the adapterThread
 746     // counters  from having a ".0" namespace.
 747     const char* thread_i = (instance == -1) ? thread_name :
 748                       PerfDataManager::name_space(thread_name, instance);
 749 
 750 
 751     char* name = PerfDataManager::counter_name(thread_i, "method");
 752     _perf_current_method =
 753                PerfDataManager::create_string_variable(SUN_CI, name,
 754                                                        cmname_buffer_length,
 755                                                        _current_method, CHECK);
 756 
 757     name = PerfDataManager::counter_name(thread_i, "type");
 758     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 759                                                           PerfData::U_None,
 760                                                          (jlong)_compile_type,
 761                                                           CHECK);
 762 
 763     name = PerfDataManager::counter_name(thread_i, "time");
 764     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 765                                                  PerfData::U_Ticks, CHECK);
 766 
 767     name = PerfDataManager::counter_name(thread_i, "compiles");
 768     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 769                                                      PerfData::U_Events, CHECK);
 770   }
 771 }
 772 
 773 // ------------------------------------------------------------------
 774 // CompileBroker::compilation_init
 775 //
 776 // Initialize the Compilation object
 777 void CompileBroker::compilation_init() {
 778   _last_method_compiled[0] = '\0';
 779 
 780 #ifndef SHARK
 781   // Set the interface to the current compiler(s).
 782   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 783   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 784 #ifdef COMPILER1
 785   if (c1_count > 0) {
 786     _compilers[0] = new Compiler();
 787   }
 788 #endif // COMPILER1
 789 
 790 #ifdef COMPILER2
 791   if (c2_count > 0) {
 792     _compilers[1] = new C2Compiler();
 793   }
 794 #endif // COMPILER2
 795 
 796 #else // SHARK
 797   int c1_count = 0;
 798   int c2_count = 1;
 799 
 800   _compilers[1] = new SharkCompiler();
 801 #endif // SHARK
 802 
 803   // Initialize the CompileTask free list
 804   _task_free_list = NULL;
 805 
 806   // Start the CompilerThreads
 807   init_compiler_threads(c1_count, c2_count);
 808   // totalTime performance counter is always created as it is required
 809   // by the implementation of java.lang.management.CompilationMBean.
 810   {
 811     EXCEPTION_MARK;
 812     _perf_total_compilation =
 813                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 814                                                  PerfData::U_Ticks, CHECK);
 815   }
 816 
 817 
 818   if (UsePerfData) {
 819 
 820     EXCEPTION_MARK;
 821 
 822     // create the jvmstat performance counters
 823     _perf_osr_compilation =
 824                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 825                                                  PerfData::U_Ticks, CHECK);
 826 
 827     _perf_standard_compilation =
 828                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 829                                                  PerfData::U_Ticks, CHECK);
 830 
 831     _perf_total_bailout_count =
 832                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 833                                                  PerfData::U_Events, CHECK);
 834 
 835     _perf_total_invalidated_count =
 836                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 837                                                  PerfData::U_Events, CHECK);
 838 
 839     _perf_total_compile_count =
 840                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 841                                                  PerfData::U_Events, CHECK);
 842     _perf_total_osr_compile_count =
 843                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 844                                                  PerfData::U_Events, CHECK);
 845 
 846     _perf_total_standard_compile_count =
 847                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 848                                                  PerfData::U_Events, CHECK);
 849 
 850     _perf_sum_osr_bytes_compiled =
 851                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 852                                                  PerfData::U_Bytes, CHECK);
 853 
 854     _perf_sum_standard_bytes_compiled =
 855                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 856                                                  PerfData::U_Bytes, CHECK);
 857 
 858     _perf_sum_nmethod_size =
 859                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 860                                                  PerfData::U_Bytes, CHECK);
 861 
 862     _perf_sum_nmethod_code_size =
 863                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 864                                                  PerfData::U_Bytes, CHECK);
 865 
 866     _perf_last_method =
 867                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 868                                        CompilerCounters::cmname_buffer_length,
 869                                        "", CHECK);
 870 
 871     _perf_last_failed_method =
 872             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 873                                        CompilerCounters::cmname_buffer_length,
 874                                        "", CHECK);
 875 
 876     _perf_last_invalidated_method =
 877         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 878                                      CompilerCounters::cmname_buffer_length,
 879                                      "", CHECK);
 880 
 881     _perf_last_compile_type =
 882              PerfDataManager::create_variable(SUN_CI, "lastType",
 883                                               PerfData::U_None,
 884                                               (jlong)CompileBroker::no_compile,
 885                                               CHECK);
 886 
 887     _perf_last_compile_size =
 888              PerfDataManager::create_variable(SUN_CI, "lastSize",
 889                                               PerfData::U_Bytes,
 890                                               (jlong)CompileBroker::no_compile,
 891                                               CHECK);
 892 
 893 
 894     _perf_last_failed_type =
 895              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
 896                                               PerfData::U_None,
 897                                               (jlong)CompileBroker::no_compile,
 898                                               CHECK);
 899 
 900     _perf_last_invalidated_type =
 901          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
 902                                           PerfData::U_None,
 903                                           (jlong)CompileBroker::no_compile,
 904                                           CHECK);
 905   }
 906 
 907   _initialized = true;
 908 }
 909 
 910 
 911 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
 912                                                     AbstractCompiler* comp, TRAPS) {
 913   CompilerThread* compiler_thread = NULL;
 914 
 915   Klass* k =
 916     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
 917                                       true, CHECK_0);
 918   instanceKlassHandle klass (THREAD, k);
 919   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
 920   Handle string = java_lang_String::create_from_str(name, CHECK_0);
 921 
 922   // Initialize thread_oop to put it into the system threadGroup
 923   Handle thread_group (THREAD,  Universe::system_thread_group());
 924   JavaValue result(T_VOID);
 925   JavaCalls::call_special(&result, thread_oop,
 926                        klass,
 927                        vmSymbols::object_initializer_name(),
 928                        vmSymbols::threadgroup_string_void_signature(),
 929                        thread_group,
 930                        string,
 931                        CHECK_0);
 932 
 933   {
 934     MutexLocker mu(Threads_lock, THREAD);
 935     compiler_thread = new CompilerThread(queue, counters);
 936     // At this point the new CompilerThread data-races with this startup
 937     // thread (which I believe is the primoridal thread and NOT the VM
 938     // thread).  This means Java bytecodes being executed at startup can
 939     // queue compile jobs which will run at whatever default priority the
 940     // newly created CompilerThread runs at.
 941 
 942 
 943     // At this point it may be possible that no osthread was created for the
 944     // JavaThread due to lack of memory. We would have to throw an exception
 945     // in that case. However, since this must work and we do not allow
 946     // exceptions anyway, check and abort if this fails.
 947 
 948     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
 949       vm_exit_during_initialization("java.lang.OutOfMemoryError",
 950                                     "unable to create new native thread");
 951     }
 952 
 953     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
 954 
 955     // Note that this only sets the JavaThread _priority field, which by
 956     // definition is limited to Java priorities and not OS priorities.
 957     // The os-priority is set in the CompilerThread startup code itself
 958 
 959     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
 960 
 961     // Note that we cannot call os::set_priority because it expects Java
 962     // priorities and we are *explicitly* using OS priorities so that it's
 963     // possible to set the compiler thread priority higher than any Java
 964     // thread.
 965 
 966     int native_prio = CompilerThreadPriority;
 967     if (native_prio == -1) {
 968       if (UseCriticalCompilerThreadPriority) {
 969         native_prio = os::java_to_os_priority[CriticalPriority];
 970       } else {
 971         native_prio = os::java_to_os_priority[NearMaxPriority];
 972       }
 973     }
 974     os::set_native_priority(compiler_thread, native_prio);
 975 
 976     java_lang_Thread::set_daemon(thread_oop());
 977 
 978     compiler_thread->set_threadObj(thread_oop());
 979     compiler_thread->set_compiler(comp);
 980     Threads::add(compiler_thread);
 981     Thread::start(compiler_thread);
 982   }
 983 
 984   // Let go of Threads_lock before yielding
 985   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
 986 
 987   return compiler_thread;
 988 }
 989 
 990 
 991 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
 992   EXCEPTION_MARK;
 993 #if !defined(ZERO) && !defined(SHARK)
 994   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
 995 #endif // !ZERO && !SHARK
 996   // Initialize the compilation queue
 997   if (c2_compiler_count > 0) {
 998     _c2_method_queue  = new CompileQueue("C2MethodQueue",  MethodCompileQueue_lock);
 999     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1000   }
1001   if (c1_compiler_count > 0) {
1002     _c1_method_queue  = new CompileQueue("C1MethodQueue",  MethodCompileQueue_lock);
1003     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1004   }
1005 
1006   int compiler_count = c1_compiler_count + c2_compiler_count;
1007 
1008   _compiler_threads =
1009     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1010 
1011   char name_buffer[256];
1012   for (int i = 0; i < c2_compiler_count; i++) {
1013     // Create a name for our thread.
1014     sprintf(name_buffer, "C2 CompilerThread%d", i);
1015     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1016     // Shark and C2
1017     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK);
1018     _compiler_threads->append(new_thread);
1019   }
1020 
1021   for (int i = c2_compiler_count; i < compiler_count; i++) {
1022     // Create a name for our thread.
1023     sprintf(name_buffer, "C1 CompilerThread%d", i);
1024     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1025     // C1
1026     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK);
1027     _compiler_threads->append(new_thread);
1028   }
1029 
1030   if (UsePerfData) {
1031     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1032   }
1033 }
1034 
1035 
1036 // Set the methods on the stack as on_stack so that redefine classes doesn't
1037 // reclaim them
1038 void CompileBroker::mark_on_stack() {
1039   if (_c2_method_queue != NULL) {
1040     _c2_method_queue->mark_on_stack();
1041   }
1042   if (_c1_method_queue != NULL) {
1043     _c1_method_queue->mark_on_stack();
1044   }
1045 }
1046 
1047 // ------------------------------------------------------------------
1048 // CompileBroker::compile_method
1049 //
1050 // Request compilation of a method.
1051 void CompileBroker::compile_method_base(methodHandle method,
1052                                         int osr_bci,
1053                                         int comp_level,
1054                                         methodHandle hot_method,
1055                                         int hot_count,
1056                                         const char* comment,
1057                                         Thread* thread) {
1058   // do nothing if compiler thread(s) is not available
1059   if (!_initialized ) {
1060     return;
1061   }
1062 
1063   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1064   assert(method->method_holder()->oop_is_instance(),
1065          "sanity check");
1066   assert(!method->method_holder()->is_not_initialized(),
1067          "method holder must be initialized");
1068   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1069 
1070   if (CIPrintRequests) {
1071     tty->print("request: ");
1072     method->print_short_name(tty);
1073     if (osr_bci != InvocationEntryBci) {
1074       tty->print(" osr_bci: %d", osr_bci);
1075     }
1076     tty->print(" comment: %s count: %d", comment, hot_count);
1077     if (!hot_method.is_null()) {
1078       tty->print(" hot: ");
1079       if (hot_method() != method()) {
1080           hot_method->print_short_name(tty);
1081       } else {
1082         tty->print("yes");
1083       }
1084     }
1085     tty->cr();
1086   }
1087 
1088   // A request has been made for compilation.  Before we do any
1089   // real work, check to see if the method has been compiled
1090   // in the meantime with a definitive result.
1091   if (compilation_is_complete(method, osr_bci, comp_level)) {
1092     return;
1093   }
1094 
1095 #ifndef PRODUCT
1096   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1097     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1098       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1099       return;
1100     }
1101   }
1102 #endif
1103 
1104   // If this method is already in the compile queue, then
1105   // we do not block the current thread.
1106   if (compilation_is_in_queue(method, osr_bci)) {
1107     // We may want to decay our counter a bit here to prevent
1108     // multiple denied requests for compilation.  This is an
1109     // open compilation policy issue. Note: The other possibility,
1110     // in the case that this is a blocking compile request, is to have
1111     // all subsequent blocking requesters wait for completion of
1112     // ongoing compiles. Note that in this case we'll need a protocol
1113     // for freeing the associated compile tasks. [Or we could have
1114     // a single static monitor on which all these waiters sleep.]
1115     return;
1116   }
1117 
1118   // If the requesting thread is holding the pending list lock
1119   // then we just return. We can't risk blocking while holding
1120   // the pending list lock or a 3-way deadlock may occur
1121   // between the reference handler thread, a GC (instigated
1122   // by a compiler thread), and compiled method registration.
1123   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1124     return;
1125   }
1126 
1127   // Outputs from the following MutexLocker block:
1128   CompileTask* task     = NULL;
1129   bool         blocking = false;
1130   CompileQueue* queue  = compile_queue(comp_level);
1131 
1132   // Acquire our lock.
1133   {
1134     MutexLocker locker(queue->lock(), thread);
1135 
1136     // Make sure the method has not slipped into the queues since
1137     // last we checked; note that those checks were "fast bail-outs".
1138     // Here we need to be more careful, see 14012000 below.
1139     if (compilation_is_in_queue(method, osr_bci)) {
1140       return;
1141     }
1142 
1143     // We need to check again to see if the compilation has
1144     // completed.  A previous compilation may have registered
1145     // some result.
1146     if (compilation_is_complete(method, osr_bci, comp_level)) {
1147       return;
1148     }
1149 
1150     // We now know that this compilation is not pending, complete,
1151     // or prohibited.  Assign a compile_id to this compilation
1152     // and check to see if it is in our [Start..Stop) range.
1153     uint compile_id = assign_compile_id(method, osr_bci);
1154     if (compile_id == 0) {
1155       // The compilation falls outside the allowed range.
1156       return;
1157     }
1158 
1159     // Should this thread wait for completion of the compile?
1160     blocking = is_compile_blocking(method, osr_bci);
1161 
1162     // We will enter the compilation in the queue.
1163     // 14012000: Note that this sets the queued_for_compile bits in
1164     // the target method. We can now reason that a method cannot be
1165     // queued for compilation more than once, as follows:
1166     // Before a thread queues a task for compilation, it first acquires
1167     // the compile queue lock, then checks if the method's queued bits
1168     // are set or it has already been compiled. Thus there can not be two
1169     // instances of a compilation task for the same method on the
1170     // compilation queue. Consider now the case where the compilation
1171     // thread has already removed a task for that method from the queue
1172     // and is in the midst of compiling it. In this case, the
1173     // queued_for_compile bits must be set in the method (and these
1174     // will be visible to the current thread, since the bits were set
1175     // under protection of the compile queue lock, which we hold now.
1176     // When the compilation completes, the compiler thread first sets
1177     // the compilation result and then clears the queued_for_compile
1178     // bits. Neither of these actions are protected by a barrier (or done
1179     // under the protection of a lock), so the only guarantee we have
1180     // (on machines with TSO (Total Store Order)) is that these values
1181     // will update in that order. As a result, the only combinations of
1182     // these bits that the current thread will see are, in temporal order:
1183     // <RESULT, QUEUE> :
1184     //     <0, 1> : in compile queue, but not yet compiled
1185     //     <1, 1> : compiled but queue bit not cleared
1186     //     <1, 0> : compiled and queue bit cleared
1187     // Because we first check the queue bits then check the result bits,
1188     // we are assured that we cannot introduce a duplicate task.
1189     // Note that if we did the tests in the reverse order (i.e. check
1190     // result then check queued bit), we could get the result bit before
1191     // the compilation completed, and the queue bit after the compilation
1192     // completed, and end up introducing a "duplicate" (redundant) task.
1193     // In that case, the compiler thread should first check if a method
1194     // has already been compiled before trying to compile it.
1195     // NOTE: in the event that there are multiple compiler threads and
1196     // there is de-optimization/recompilation, things will get hairy,
1197     // and in that case it's best to protect both the testing (here) of
1198     // these bits, and their updating (here and elsewhere) under a
1199     // common lock.
1200     task = create_compile_task(queue,
1201                                compile_id, method,
1202                                osr_bci, comp_level,
1203                                hot_method, hot_count, comment,
1204                                blocking);
1205   }
1206 
1207   if (blocking) {
1208     wait_for_completion(task);
1209   }
1210 }
1211 
1212 
1213 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1214                                        int comp_level,
1215                                        methodHandle hot_method, int hot_count,
1216                                        const char* comment, Thread* THREAD) {
1217   // make sure arguments make sense
1218   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1219   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1220   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1221   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1222   // allow any levels for WhiteBox
1223   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1224   // return quickly if possible
1225 
1226   // lock, make sure that the compilation
1227   // isn't prohibited in a straightforward way.
1228   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1229   if (comp == NULL || !comp->can_compile_method(method) ||
1230       compilation_is_prohibited(method, osr_bci, comp_level)) {
1231     return NULL;
1232   }
1233 
1234   if (osr_bci == InvocationEntryBci) {
1235     // standard compilation
1236     nmethod* method_code = method->code();
1237     if (method_code != NULL) {
1238       if (compilation_is_complete(method, osr_bci, comp_level)) {
1239         return method_code;
1240       }
1241     }
1242     if (method->is_not_compilable(comp_level)) {
1243       return NULL;
1244     }
1245   } else {
1246     // osr compilation
1247 #ifndef TIERED
1248     // seems like an assert of dubious value
1249     assert(comp_level == CompLevel_highest_tier,
1250            "all OSR compiles are assumed to be at a single compilation lavel");
1251 #endif // TIERED
1252     // We accept a higher level osr method
1253     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1254     if (nm != NULL) return nm;
1255     if (method->is_not_osr_compilable(comp_level)) return NULL;
1256   }
1257 
1258   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1259   // some prerequisites that are compiler specific
1260   if (comp->is_c2() || comp->is_shark()) {
1261     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1262     // Resolve all classes seen in the signature of the method
1263     // we are compiling.
1264     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1265   }
1266 
1267   // If the method is native, do the lookup in the thread requesting
1268   // the compilation. Native lookups can load code, which is not
1269   // permitted during compilation.
1270   //
1271   // Note: A native method implies non-osr compilation which is
1272   //       checked with an assertion at the entry of this method.
1273   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1274     bool in_base_library;
1275     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1276     if (HAS_PENDING_EXCEPTION) {
1277       // In case of an exception looking up the method, we just forget
1278       // about it. The interpreter will kick-in and throw the exception.
1279       method->set_not_compilable(); // implies is_not_osr_compilable()
1280       CLEAR_PENDING_EXCEPTION;
1281       return NULL;
1282     }
1283     assert(method->has_native_function(), "must have native code by now");
1284   }
1285 
1286   // RedefineClasses() has replaced this method; just return
1287   if (method->is_old()) {
1288     return NULL;
1289   }
1290 
1291   // JVMTI -- post_compile_event requires jmethod_id() that may require
1292   // a lock the compiling thread can not acquire. Prefetch it here.
1293   if (JvmtiExport::should_post_compiled_method_load()) {
1294     method->jmethod_id();
1295   }
1296 
1297   // If the compiler is shut off due to code cache getting full
1298   // fail out now so blocking compiles dont hang the java thread
1299   if (!should_compile_new_jobs()) {
1300     CompilationPolicy::policy()->delay_compilation(method());
1301     return NULL;
1302   }
1303 
1304   // do the compilation
1305   if (method->is_native()) {
1306     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1307       // Acquire our lock.
1308       int compile_id;
1309       {
1310         MutexLocker locker(MethodCompileQueue_lock, THREAD);
1311         compile_id = assign_compile_id(method, standard_entry_bci);
1312       }
1313       (void) AdapterHandlerLibrary::create_native_wrapper(method, compile_id);
1314     } else {
1315       return NULL;
1316     }
1317   } else {
1318     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1319   }
1320 
1321   // return requested nmethod
1322   // We accept a higher level osr method
1323   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1324 }
1325 
1326 
1327 // ------------------------------------------------------------------
1328 // CompileBroker::compilation_is_complete
1329 //
1330 // See if compilation of this method is already complete.
1331 bool CompileBroker::compilation_is_complete(methodHandle method,
1332                                             int          osr_bci,
1333                                             int          comp_level) {
1334   bool is_osr = (osr_bci != standard_entry_bci);
1335   if (is_osr) {
1336     if (method->is_not_osr_compilable(comp_level)) {
1337       return true;
1338     } else {
1339       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1340       return (result != NULL);
1341     }
1342   } else {
1343     if (method->is_not_compilable(comp_level)) {
1344       return true;
1345     } else {
1346       nmethod* result = method->code();
1347       if (result == NULL) return false;
1348       return comp_level == result->comp_level();
1349     }
1350   }
1351 }
1352 
1353 
1354 // ------------------------------------------------------------------
1355 // CompileBroker::compilation_is_in_queue
1356 //
1357 // See if this compilation is already requested.
1358 //
1359 // Implementation note: there is only a single "is in queue" bit
1360 // for each method.  This means that the check below is overly
1361 // conservative in the sense that an osr compilation in the queue
1362 // will block a normal compilation from entering the queue (and vice
1363 // versa).  This can be remedied by a full queue search to disambiguate
1364 // cases.  If it is deemed profitible, this may be done.
1365 bool CompileBroker::compilation_is_in_queue(methodHandle method,
1366                                             int          osr_bci) {
1367   return method->queued_for_compilation();
1368 }
1369 
1370 // ------------------------------------------------------------------
1371 // CompileBroker::compilation_is_prohibited
1372 //
1373 // See if this compilation is not allowed.
1374 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1375   bool is_native = method->is_native();
1376   // Some compilers may not support the compilation of natives.
1377   AbstractCompiler *comp = compiler(comp_level);
1378   if (is_native &&
1379       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1380     method->set_not_compilable_quietly(comp_level);
1381     return true;
1382   }
1383 
1384   bool is_osr = (osr_bci != standard_entry_bci);
1385   // Some compilers may not support on stack replacement.
1386   if (is_osr &&
1387       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1388     method->set_not_osr_compilable(comp_level);
1389     return true;
1390   }
1391 
1392   // The method may be explicitly excluded by the user.
1393   bool quietly;
1394   if (CompilerOracle::should_exclude(method, quietly)) {
1395     if (!quietly) {
1396       // This does not happen quietly...
1397       ResourceMark rm;
1398       tty->print("### Excluding %s:%s",
1399                  method->is_native() ? "generation of native wrapper" : "compile",
1400                  (method->is_static() ? " static" : ""));
1401       method->print_short_name(tty);
1402       tty->cr();
1403     }
1404     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1405   }
1406 
1407   return false;
1408 }
1409 
1410 
1411 // ------------------------------------------------------------------
1412 // CompileBroker::assign_compile_id
1413 //
1414 // Assign a serialized id number to this compilation request.  If the
1415 // number falls out of the allowed range, return a 0.  OSR
1416 // compilations may be numbered separately from regular compilations
1417 // if certain debugging flags are used.
1418 uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1419   assert(MethodCompileQueue_lock->owner() == Thread::current(),
1420          "must hold the compilation queue lock");
1421   bool is_osr = (osr_bci != standard_entry_bci);
1422   uint id;
1423   if (CICountOSR && is_osr) {
1424     id = ++_osr_compilation_id;
1425     if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
1426       return id;
1427     }
1428   } else {
1429     id = ++_compilation_id;
1430     if ((uint)CIStart <= id && id < (uint)CIStop) {
1431       return id;
1432     }
1433   }
1434 
1435   // Method was not in the appropriate compilation range.
1436   method->set_not_compilable_quietly();
1437   return 0;
1438 }
1439 
1440 
1441 // ------------------------------------------------------------------
1442 // CompileBroker::is_compile_blocking
1443 //
1444 // Should the current thread be blocked until this compilation request
1445 // has been fulfilled?
1446 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {
1447   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1448   return !BackgroundCompilation;
1449 }
1450 
1451 
1452 // ------------------------------------------------------------------
1453 // CompileBroker::preload_classes
1454 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1455   // Move this code over from c1_Compiler.cpp
1456   ShouldNotReachHere();
1457 }
1458 
1459 
1460 // ------------------------------------------------------------------
1461 // CompileBroker::create_compile_task
1462 //
1463 // Create a CompileTask object representing the current request for
1464 // compilation.  Add this task to the queue.
1465 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1466                                               int           compile_id,
1467                                               methodHandle  method,
1468                                               int           osr_bci,
1469                                               int           comp_level,
1470                                               methodHandle  hot_method,
1471                                               int           hot_count,
1472                                               const char*   comment,
1473                                               bool          blocking) {
1474   CompileTask* new_task = allocate_task();
1475   new_task->initialize(compile_id, method, osr_bci, comp_level,
1476                        hot_method, hot_count, comment,
1477                        blocking);
1478   queue->add(new_task);
1479   return new_task;
1480 }
1481 
1482 
1483 // ------------------------------------------------------------------
1484 // CompileBroker::allocate_task
1485 //
1486 // Allocate a CompileTask, from the free list if possible.
1487 CompileTask* CompileBroker::allocate_task() {
1488   MutexLocker locker(CompileTaskAlloc_lock);
1489   CompileTask* task = NULL;
1490   if (_task_free_list != NULL) {
1491     task = _task_free_list;
1492     _task_free_list = task->next();
1493     task->set_next(NULL);
1494   } else {
1495     task = new CompileTask();
1496     task->set_next(NULL);
1497   }
1498   return task;
1499 }
1500 
1501 
1502 // ------------------------------------------------------------------
1503 // CompileBroker::free_task
1504 //
1505 // Add a task to the free list.
1506 void CompileBroker::free_task(CompileTask* task) {
1507   MutexLocker locker(CompileTaskAlloc_lock);
1508   task->free();
1509   task->set_next(_task_free_list);
1510   _task_free_list = task;
1511 }
1512 
1513 
1514 // ------------------------------------------------------------------
1515 // CompileBroker::wait_for_completion
1516 //
1517 // Wait for the given method CompileTask to complete.
1518 void CompileBroker::wait_for_completion(CompileTask* task) {
1519   if (CIPrintCompileQueue) {
1520     tty->print_cr("BLOCKING FOR COMPILE");
1521   }
1522 
1523   assert(task->is_blocking(), "can only wait on blocking task");
1524 
1525   JavaThread *thread = JavaThread::current();
1526   thread->set_blocked_on_compilation(true);
1527 
1528   methodHandle method(thread, task->method());
1529   {
1530     MutexLocker waiter(task->lock(), thread);
1531 
1532     while (!task->is_complete())
1533       task->lock()->wait();
1534   }
1535   // It is harmless to check this status without the lock, because
1536   // completion is a stable property (until the task object is recycled).
1537   assert(task->is_complete(), "Compilation should have completed");
1538   assert(task->code_handle() == NULL, "must be reset");
1539 
1540   thread->set_blocked_on_compilation(false);
1541 
1542   // By convention, the waiter is responsible for recycling a
1543   // blocking CompileTask. Since there is only one waiter ever
1544   // waiting on a CompileTask, we know that no one else will
1545   // be using this CompileTask; we can free it.
1546   free_task(task);
1547 }
1548 
1549 // Initialize compiler thread(s) + compiler object(s).
1550 bool CompileBroker::init_compiler_runtime() {
1551   CompilerThread* thread = CompilerThread::current();
1552   AbstractCompiler* comp = thread->compiler();
1553   // Final sanity check - the compiler object must exist
1554   guarantee(comp != NULL, "Compiler object must exist");
1555 
1556   int system_dictionary_modification_counter;
1557   {
1558     MutexLocker locker(Compile_lock, thread);
1559     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1560   }
1561 
1562   {
1563     // Must switch to native to allocate ci_env
1564     ThreadToNativeFromVM ttn(thread);
1565     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1566     // Cache Jvmti state
1567     ci_env.cache_jvmti_state();
1568     // Cache DTrace flags
1569     ci_env.cache_dtrace_flags();
1570 
1571     // Switch back to VM state to to compiler initialization
1572     ThreadInVMfromNative tv(thread);
1573     ResetNoHandleMark rnhm;
1574 
1575     if (!comp->is_shark()) {
1576       // Perform per-thread and global initializations
1577       comp->initialize();
1578     }
1579   }
1580 
1581   if (comp->should_exit()) {
1582     disable_compilation_forever();
1583     // If compiler initialization failed, no compiler thread that is specific to a
1584     // particular compiler runtime will ever start to compile methods.
1585 
1586     shutdown_compiler_runtime(comp, thread);
1587     return false;
1588   }
1589 
1590    // C1 specific check
1591   if ((comp->is_c1()) && (thread->get_buffer_blob() == NULL)) {
1592     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1593     return false;
1594   }
1595 
1596   return true;
1597 }
1598 
1599 // If C1 and/or C2 initialization failed, we shut down all compilation.
1600 // We do this to keep things simple. This can be changed if it ever turns out to be
1601 // a problem.
1602 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1603   // Free buffer blob, if allocated
1604   if (thread->get_buffer_blob() != NULL) {
1605     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1606     CodeCache::free(thread->get_buffer_blob());
1607   }
1608 
1609   if (comp->should_perform_shutdown()) {
1610     // There are two reasons for shutting down the compiler
1611     // 1) compiler runtime initialization failed
1612     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1613     warning("Shutting down compiler %s (no space to run compilers)", comp->name());
1614 
1615     // Only one thread per compiler runtime object enters here
1616     // Set state to shut down
1617     comp->set_shut_down();
1618 
1619     MutexLocker mu(MethodCompileQueue_lock, thread);
1620     CompileQueue* queue;
1621     if (_c1_method_queue != NULL) {
1622       _c1_method_queue->delete_all();
1623       queue = _c1_method_queue;
1624       _c1_method_queue = NULL;
1625       delete _c1_method_queue;
1626     }
1627 
1628     if (_c2_method_queue != NULL) {
1629       _c2_method_queue->delete_all();
1630       queue = _c2_method_queue;
1631       _c2_method_queue = NULL;
1632       delete _c2_method_queue;
1633     }
1634 
1635     // We could delete compiler runtimes also. However, there are references to
1636     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1637     // fail. This can be done later if necessary.
1638     /*if ((comp->is_c1()) && (_compilers[0] != NULL)) {
1639       delete _compilers[0];
1640       _compilers[0] = NULL;
1641     }
1642 
1643     if ((comp->is_c2()) && (_compilers[1] != NULL)) {
1644       delete _compilers[1];
1645       _compilers[1] = NULL;
1646     }*/
1647   }
1648 }
1649 
1650 // ------------------------------------------------------------------
1651 // CompileBroker::compiler_thread_loop
1652 //
1653 // The main loop run by a CompilerThread.
1654 void CompileBroker::compiler_thread_loop() {
1655   CompilerThread* thread = CompilerThread::current();
1656   CompileQueue* queue = thread->queue();
1657   // For the thread that initializes the ciObjectFactory
1658   // this resource mark holds all the shared objects
1659   ResourceMark rm;
1660 
1661   // First thread to get here will initialize the compiler interface
1662 
1663   if (!ciObjectFactory::is_initialized()) {
1664     ASSERT_IN_VM;
1665     MutexLocker only_one (CompileThread_lock, thread);
1666     if (!ciObjectFactory::is_initialized()) {
1667       ciObjectFactory::initialize();
1668     }
1669   }
1670 
1671   // Open a log.
1672   if (LogCompilation) {
1673     init_compiler_thread_log();
1674   }
1675   CompileLog* log = thread->log();
1676   if (log != NULL) {
1677     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1678                     thread->name(),
1679                     os::current_thread_id(),
1680                     os::current_process_id());
1681     log->stamp();
1682     log->end_elem();
1683   }
1684 
1685   // If compiler thread/runtime initialization fails, exit the compiler thread
1686   if (!init_compiler_runtime()) {
1687     return;
1688   }
1689 
1690   // Poll for new compilation tasks as long as the JVM runs. Compilation
1691   // should only be disabled if something went wrong while initializing the
1692   // compiler runtimes. This, in turn, should not happen. The only known case
1693   // when compiler runtime initialization fails is if there is not enough free
1694   // space in the code cache to generate the necessary stubs, etc.
1695   while (!is_compilation_disabled_forever()) {
1696     // We need this HandleMark to avoid leaking VM handles.
1697     HandleMark hm(thread);
1698 
1699     if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1700       // the code cache is really full
1701       handle_full_code_cache();
1702     }
1703 
1704     CompileTask* task = queue->get();
1705     if (task == NULL) {
1706       continue;
1707     }
1708 
1709     // Give compiler threads an extra quanta.  They tend to be bursty and
1710     // this helps the compiler to finish up the job.
1711     if( CompilerThreadHintNoPreempt )
1712       os::hint_no_preempt();
1713 
1714     // trace per thread time and compile statistics
1715     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1716     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1717 
1718     // Assign the task to the current thread.  Mark this compilation
1719     // thread as active for the profiler.
1720     CompileTaskWrapper ctw(task);
1721     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1722     task->set_code_handle(&result_handle);
1723     methodHandle method(thread, task->method());
1724 
1725     // Never compile a method if breakpoints are present in it
1726     if (method()->number_of_breakpoints() == 0) {
1727       // Compile the method.
1728       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1729 #ifdef COMPILER1
1730         // Allow repeating compilations for the purpose of benchmarking
1731         // compile speed. This is not useful for customers.
1732         if (CompilationRepeat != 0) {
1733           int compile_count = CompilationRepeat;
1734           while (compile_count > 0) {
1735             invoke_compiler_on_method(task);
1736             nmethod* nm = method->code();
1737             if (nm != NULL) {
1738               nm->make_zombie();
1739               method->clear_code();
1740             }
1741             compile_count--;
1742           }
1743         }
1744 #endif /* COMPILER1 */
1745         invoke_compiler_on_method(task);
1746       } else {
1747         // After compilation is disabled, remove remaining methods from queue
1748         method->clear_queued_for_compilation();
1749       }
1750     }
1751   }
1752 
1753   // Shut down compiler runtime
1754   shutdown_compiler_runtime(thread->compiler(), thread);
1755 }
1756 
1757 // ------------------------------------------------------------------
1758 // CompileBroker::init_compiler_thread_log
1759 //
1760 // Set up state required by +LogCompilation.
1761 void CompileBroker::init_compiler_thread_log() {
1762     CompilerThread* thread = CompilerThread::current();
1763     char  file_name[4*K];
1764     FILE* fp = NULL;
1765     intx thread_id = os::current_thread_id();
1766     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1767       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1768       if (dir == NULL) {
1769         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1770                      thread_id, os::current_process_id());
1771       } else {
1772         jio_snprintf(file_name, sizeof(file_name),
1773                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1774                      os::file_separator(), thread_id, os::current_process_id());
1775       }
1776 
1777       fp = fopen(file_name, "at");
1778       if (fp != NULL) {
1779         if (LogCompilation && Verbose) {
1780           tty->print_cr("Opening compilation log %s", file_name);
1781         }
1782         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1783         thread->init_log(log);
1784 
1785         if (xtty != NULL) {
1786           ttyLocker ttyl;
1787           // Record any per thread log files
1788           xtty->elem("thread_logfile thread='%d' filename='%s'", thread_id, file_name);
1789         }
1790         return;
1791       }
1792     }
1793     warning("Cannot open log file: %s", file_name);
1794 }
1795 
1796 // ------------------------------------------------------------------
1797 // CompileBroker::set_should_block
1798 //
1799 // Set _should_block.
1800 // Call this from the VM, with Threads_lock held and a safepoint requested.
1801 void CompileBroker::set_should_block() {
1802   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1803   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1804 #ifndef PRODUCT
1805   if (PrintCompilation && (Verbose || WizardMode))
1806     tty->print_cr("notifying compiler thread pool to block");
1807 #endif
1808   _should_block = true;
1809 }
1810 
1811 // ------------------------------------------------------------------
1812 // CompileBroker::maybe_block
1813 //
1814 // Call this from the compiler at convenient points, to poll for _should_block.
1815 void CompileBroker::maybe_block() {
1816   if (_should_block) {
1817 #ifndef PRODUCT
1818     if (PrintCompilation && (Verbose || WizardMode))
1819       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", Thread::current());
1820 #endif
1821     ThreadInVMfromNative tivfn(JavaThread::current());
1822   }
1823 }
1824 
1825 // wrapper for CodeCache::print_summary()
1826 static void codecache_print(bool detailed)
1827 {
1828   ResourceMark rm;
1829   stringStream s;
1830   // Dump code cache  into a buffer before locking the tty,
1831   {
1832     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1833     CodeCache::print_summary(&s, detailed);
1834   }
1835   ttyLocker ttyl;
1836   tty->print(s.as_string());
1837 }
1838 
1839 // ------------------------------------------------------------------
1840 // CompileBroker::invoke_compiler_on_method
1841 //
1842 // Compile a method.
1843 //
1844 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1845   if (PrintCompilation) {
1846     ResourceMark rm;
1847     task->print_line();
1848   }
1849   elapsedTimer time;
1850 
1851   CompilerThread* thread = CompilerThread::current();
1852   ResourceMark rm(thread);
1853 
1854   if (LogEvents) {
1855     _compilation_log->log_compile(thread, task);
1856   }
1857 
1858   // Common flags.
1859   uint compile_id = task->compile_id();
1860   int osr_bci = task->osr_bci();
1861   bool is_osr = (osr_bci != standard_entry_bci);
1862   bool should_log = (thread->log() != NULL);
1863   bool should_break = false;
1864   int task_level = task->comp_level();
1865   {
1866     // create the handle inside it's own block so it can't
1867     // accidentally be referenced once the thread transitions to
1868     // native.  The NoHandleMark before the transition should catch
1869     // any cases where this occurs in the future.
1870     methodHandle method(thread, task->method());
1871     should_break = check_break_at(method, compile_id, is_osr);
1872     if (should_log && !CompilerOracle::should_log(method)) {
1873       should_log = false;
1874     }
1875     assert(!method->is_native(), "no longer compile natives");
1876 
1877     // Save information about this method in case of failure.
1878     set_last_compile(thread, method, is_osr, task_level);
1879 
1880     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1881   }
1882 
1883   // Allocate a new set of JNI handles.
1884   push_jni_handle_block();
1885   Method* target_handle = task->method();
1886   int compilable = ciEnv::MethodCompilable;
1887   {
1888     int system_dictionary_modification_counter;
1889     {
1890       MutexLocker locker(Compile_lock, thread);
1891       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1892     }
1893 
1894     NoHandleMark  nhm;
1895     ThreadToNativeFromVM ttn(thread);
1896 
1897     ciEnv ci_env(task, system_dictionary_modification_counter);
1898     if (should_break) {
1899       ci_env.set_break_at_compile(true);
1900     }
1901     if (should_log) {
1902       ci_env.set_log(thread->log());
1903     }
1904     assert(thread->env() == &ci_env, "set by ci_env");
1905     // The thread-env() field is cleared in ~CompileTaskWrapper.
1906 
1907     // Cache Jvmti state
1908     ci_env.cache_jvmti_state();
1909 
1910     // Cache DTrace flags
1911     ci_env.cache_dtrace_flags();
1912 
1913     ciMethod* target = ci_env.get_method_from_handle(target_handle);
1914 
1915     TraceTime t1("compilation", &time);
1916     EventCompilation event;
1917 
1918     AbstractCompiler *comp = compiler(task_level);
1919     if (comp == NULL) {
1920       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
1921     } else {
1922       comp->compile_method(&ci_env, target, osr_bci);
1923     }
1924 
1925     if (!ci_env.failing() && task->code() == NULL) {
1926       //assert(false, "compiler should always document failure");
1927       // The compiler elected, without comment, not to register a result.
1928       // Do not attempt further compilations of this method.
1929       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
1930     }
1931 
1932     // Copy this bit to the enclosing block:
1933     compilable = ci_env.compilable();
1934 
1935     if (ci_env.failing()) {
1936       const char* retry_message = ci_env.retry_message();
1937       if (_compilation_log != NULL) {
1938         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
1939       }
1940       if (PrintCompilation) {
1941         FormatBufferResource msg = retry_message != NULL ?
1942             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
1943             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
1944         task->print_compilation(tty, msg);
1945       }
1946     } else {
1947       task->mark_success();
1948       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
1949       if (_compilation_log != NULL) {
1950         nmethod* code = task->code();
1951         if (code != NULL) {
1952           _compilation_log->log_nmethod(thread, code);
1953         }
1954       }
1955     }
1956     // simulate crash during compilation
1957     assert(task->compile_id() != CICrashAt, "just as planned");
1958     if (event.should_commit()) {
1959       event.set_method(target->get_Method());
1960       event.set_compileID(compile_id);
1961       event.set_compileLevel(task->comp_level());
1962       event.set_succeded(task->is_success());
1963       event.set_isOsr(is_osr);
1964       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1965       event.set_inlinedBytes(task->num_inlined_bytecodes());
1966       event.commit();
1967     }
1968   }
1969   pop_jni_handle_block();
1970 
1971   methodHandle method(thread, task->method());
1972 
1973   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
1974 
1975   collect_statistics(thread, time, task);
1976 
1977   if (PrintCompilation && PrintCompilation2) {
1978     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
1979     tty->print("%4d ", compile_id);    // print compilation number
1980     tty->print("%s ", (is_osr ? "%" : " "));
1981     if (task->code() != NULL) {
1982       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
1983     }
1984     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
1985   }
1986 
1987   if (PrintCodeCacheOnCompilation)
1988     codecache_print(/* detailed= */ false);
1989 
1990   // Disable compilation, if required.
1991   switch (compilable) {
1992   case ciEnv::MethodCompilable_never:
1993     if (is_osr)
1994       method->set_not_osr_compilable_quietly();
1995     else
1996       method->set_not_compilable_quietly();
1997     break;
1998   case ciEnv::MethodCompilable_not_at_tier:
1999     if (is_osr)
2000       method->set_not_osr_compilable_quietly(task_level);
2001     else
2002       method->set_not_compilable_quietly(task_level);
2003     break;
2004   }
2005 
2006   // Note that the queued_for_compilation bits are cleared without
2007   // protection of a mutex. [They were set by the requester thread,
2008   // when adding the task to the complie queue -- at which time the
2009   // compile queue lock was held. Subsequently, we acquired the compile
2010   // queue lock to get this task off the compile queue; thus (to belabour
2011   // the point somewhat) our clearing of the bits must be occurring
2012   // only after the setting of the bits. See also 14012000 above.
2013   method->clear_queued_for_compilation();
2014 
2015 #ifdef ASSERT
2016   if (CollectedHeap::fired_fake_oom()) {
2017     // The current compile received a fake OOM during compilation so
2018     // go ahead and exit the VM since the test apparently succeeded
2019     tty->print_cr("*** Shutting down VM after successful fake OOM");
2020     vm_exit(0);
2021   }
2022 #endif
2023 }
2024 
2025 // ------------------------------------------------------------------
2026 // CompileBroker::handle_full_code_cache
2027 //
2028 // The CodeCache is full.  Print out warning and disable compilation or
2029 // try code cache cleaning so compilation can continue later.
2030 void CompileBroker::handle_full_code_cache() {
2031   UseInterpreter = true;
2032   if (UseCompiler || AlwaysCompileLoopMethods ) {
2033     if (xtty != NULL) {
2034       ResourceMark rm;
2035       stringStream s;
2036       // Dump code cache state into a buffer before locking the tty,
2037       // because log_state() will use locks causing lock conflicts.
2038       CodeCache::log_state(&s);
2039       // Lock to prevent tearing
2040       ttyLocker ttyl;
2041       xtty->begin_elem("code_cache_full");
2042       xtty->print(s.as_string());
2043       xtty->stamp();
2044       xtty->end_elem();
2045     }
2046     warning("CodeCache is full. Compiler has been disabled.");
2047     warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2048 
2049     CodeCache::report_codemem_full();
2050 
2051 
2052 #ifndef PRODUCT
2053     if (CompileTheWorld || ExitOnFullCodeCache) {
2054       codecache_print(/* detailed= */ true);
2055       before_exit(JavaThread::current());
2056       exit_globals(); // will delete tty
2057       vm_direct_exit(CompileTheWorld ? 0 : 1);
2058     }
2059 #endif
2060     if (UseCodeCacheFlushing) {
2061       // Since code cache is full, immediately stop new compiles
2062       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2063         NMethodSweeper::log_sweep("disable_compiler");
2064         NMethodSweeper::possibly_sweep();
2065       }
2066     } else {
2067       disable_compilation_forever();
2068     }
2069   }
2070   codecache_print(/* detailed= */ true);
2071 }
2072 
2073 // ------------------------------------------------------------------
2074 // CompileBroker::set_last_compile
2075 //
2076 // Record this compilation for debugging purposes.
2077 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2078   ResourceMark rm;
2079   char* method_name = method->name()->as_C_string();
2080   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2081   char current_method[CompilerCounters::cmname_buffer_length];
2082   size_t maxLen = CompilerCounters::cmname_buffer_length;
2083 
2084   if (UsePerfData) {
2085     const char* class_name = method->method_holder()->name()->as_C_string();
2086 
2087     size_t s1len = strlen(class_name);
2088     size_t s2len = strlen(method_name);
2089 
2090     // check if we need to truncate the string
2091     if (s1len + s2len + 2 > maxLen) {
2092 
2093       // the strategy is to lop off the leading characters of the
2094       // class name and the trailing characters of the method name.
2095 
2096       if (s2len + 2 > maxLen) {
2097         // lop of the entire class name string, let snprintf handle
2098         // truncation of the method name.
2099         class_name += s1len; // null string
2100       }
2101       else {
2102         // lop off the extra characters from the front of the class name
2103         class_name += ((s1len + s2len + 2) - maxLen);
2104       }
2105     }
2106 
2107     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2108   }
2109 
2110   if (CICountOSR && is_osr) {
2111     _last_compile_type = osr_compile;
2112   } else {
2113     _last_compile_type = normal_compile;
2114   }
2115   _last_compile_level = comp_level;
2116 
2117   if (UsePerfData) {
2118     CompilerCounters* counters = thread->counters();
2119     counters->set_current_method(current_method);
2120     counters->set_compile_type((jlong)_last_compile_type);
2121   }
2122 }
2123 
2124 
2125 // ------------------------------------------------------------------
2126 // CompileBroker::push_jni_handle_block
2127 //
2128 // Push on a new block of JNI handles.
2129 void CompileBroker::push_jni_handle_block() {
2130   JavaThread* thread = JavaThread::current();
2131 
2132   // Allocate a new block for JNI handles.
2133   // Inlined code from jni_PushLocalFrame()
2134   JNIHandleBlock* java_handles = thread->active_handles();
2135   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2136   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2137   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2138   thread->set_active_handles(compile_handles);
2139 }
2140 
2141 
2142 // ------------------------------------------------------------------
2143 // CompileBroker::pop_jni_handle_block
2144 //
2145 // Pop off the current block of JNI handles.
2146 void CompileBroker::pop_jni_handle_block() {
2147   JavaThread* thread = JavaThread::current();
2148 
2149   // Release our JNI handle block
2150   JNIHandleBlock* compile_handles = thread->active_handles();
2151   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2152   thread->set_active_handles(java_handles);
2153   compile_handles->set_pop_frame_link(NULL);
2154   JNIHandleBlock::release_block(compile_handles, thread); // may block
2155 }
2156 
2157 
2158 // ------------------------------------------------------------------
2159 // CompileBroker::check_break_at
2160 //
2161 // Should the compilation break at the current compilation.
2162 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2163   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2164     return true;
2165   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2166     return true;
2167   } else {
2168     return (compile_id == CIBreakAt);
2169   }
2170 }
2171 
2172 // ------------------------------------------------------------------
2173 // CompileBroker::collect_statistics
2174 //
2175 // Collect statistics about the compilation.
2176 
2177 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2178   bool success = task->is_success();
2179   methodHandle method (thread, task->method());
2180   uint compile_id = task->compile_id();
2181   bool is_osr = (task->osr_bci() != standard_entry_bci);
2182   nmethod* code = task->code();
2183   CompilerCounters* counters = thread->counters();
2184 
2185   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2186   MutexLocker locker(CompileStatistics_lock);
2187 
2188   // _perf variables are production performance counters which are
2189   // updated regardless of the setting of the CITime and CITimeEach flags
2190   //
2191   if (!success) {
2192     _total_bailout_count++;
2193     if (UsePerfData) {
2194       _perf_last_failed_method->set_value(counters->current_method());
2195       _perf_last_failed_type->set_value(counters->compile_type());
2196       _perf_total_bailout_count->inc();
2197     }
2198   } else if (code == NULL) {
2199     if (UsePerfData) {
2200       _perf_last_invalidated_method->set_value(counters->current_method());
2201       _perf_last_invalidated_type->set_value(counters->compile_type());
2202       _perf_total_invalidated_count->inc();
2203     }
2204     _total_invalidated_count++;
2205   } else {
2206     // Compilation succeeded
2207 
2208     // update compilation ticks - used by the implementation of
2209     // java.lang.management.CompilationMBean
2210     _perf_total_compilation->inc(time.ticks());
2211 
2212     _t_total_compilation.add(time);
2213     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2214 
2215     if (CITime) {
2216       if (is_osr) {
2217         _t_osr_compilation.add(time);
2218         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2219       } else {
2220         _t_standard_compilation.add(time);
2221         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2222       }
2223     }
2224 
2225     if (UsePerfData) {
2226       // save the name of the last method compiled
2227       _perf_last_method->set_value(counters->current_method());
2228       _perf_last_compile_type->set_value(counters->compile_type());
2229       _perf_last_compile_size->set_value(method->code_size() +
2230                                          task->num_inlined_bytecodes());
2231       if (is_osr) {
2232         _perf_osr_compilation->inc(time.ticks());
2233         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2234       } else {
2235         _perf_standard_compilation->inc(time.ticks());
2236         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2237       }
2238     }
2239 
2240     if (CITimeEach) {
2241       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2242       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2243                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2244     }
2245 
2246     // Collect counts of successful compilations
2247     _sum_nmethod_size      += code->total_size();
2248     _sum_nmethod_code_size += code->insts_size();
2249     _total_compile_count++;
2250 
2251     if (UsePerfData) {
2252       _perf_sum_nmethod_size->inc(     code->total_size());
2253       _perf_sum_nmethod_code_size->inc(code->insts_size());
2254       _perf_total_compile_count->inc();
2255     }
2256 
2257     if (is_osr) {
2258       if (UsePerfData) _perf_total_osr_compile_count->inc();
2259       _total_osr_compile_count++;
2260     } else {
2261       if (UsePerfData) _perf_total_standard_compile_count->inc();
2262       _total_standard_compile_count++;
2263     }
2264   }
2265   // set the current method for the thread to null
2266   if (UsePerfData) counters->set_current_method("");
2267 }
2268 
2269 const char* CompileBroker::compiler_name(int comp_level) {
2270   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2271   if (comp == NULL) {
2272     return "no compiler";
2273   } else {
2274     return (comp->name());
2275   }
2276 }
2277 
2278 void CompileBroker::print_times() {
2279   tty->cr();
2280   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2281   tty->print_cr("------------------------------------------------");
2282                //0000000000111111111122222222223333333333444444444455555555556666666666
2283                //0123456789012345678901234567890123456789012345678901234567890123456789
2284   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2285   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2286                 CompileBroker::_t_standard_compilation.seconds(),
2287                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2288   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);
2289 
2290   AbstractCompiler *comp = compiler(CompLevel_simple);
2291   if (comp != NULL) {
2292     comp->print_timers();
2293   }
2294   comp = compiler(CompLevel_full_optimization);
2295   if (comp != NULL) {
2296     comp->print_timers();
2297   }
2298   tty->cr();
2299   tty->print_cr("  Total compiled methods   : %6d methods", CompileBroker::_total_compile_count);
2300   tty->print_cr("    Standard compilation   : %6d methods", CompileBroker::_total_standard_compile_count);
2301   tty->print_cr("    On stack replacement   : %6d methods", CompileBroker::_total_osr_compile_count);
2302   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2303   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2304   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2305   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2306   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2307   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2308   tty->cr();
2309   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2310   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2311 }
2312 
2313 // Debugging output for failure
2314 void CompileBroker::print_last_compile() {
2315   if ( _last_compile_level != CompLevel_none &&
2316        compiler(_last_compile_level) != NULL &&
2317        _last_method_compiled != NULL &&
2318        _last_compile_type != no_compile) {
2319     if (_last_compile_type == osr_compile) {
2320       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2321                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2322     } else {
2323       tty->print_cr("Last parse:  %d+++(%d) %s",
2324                     _compilation_id, _last_compile_level, _last_method_compiled);
2325     }
2326   }
2327 }
2328 
2329 
2330 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2331 #ifndef PRODUCT
2332   st->print_cr("Compiler thread printing unimplemented.");
2333   st->cr();
2334 #endif
2335 }