1 /*
   2  * Copyright (c) 1999, 2019, 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 "jfr/jfrEvents.hpp"
  34 #include "memory/allocation.inline.hpp"
  35 #include "oops/methodData.hpp"
  36 #include "oops/method.hpp"
  37 #include "oops/oop.inline.hpp"
  38 #include "prims/nativeLookup.hpp"
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/compilationPolicy.hpp"
  41 #include "runtime/init.hpp"
  42 #include "runtime/interfaceSupport.hpp"
  43 #include "runtime/javaCalls.hpp"
  44 #include "runtime/os.hpp"
  45 #include "runtime/sharedRuntime.hpp"
  46 #include "runtime/sweeper.hpp"
  47 #include "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::_print_compilation_warning = 0;
 130 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
 131 
 132 // The installed compiler(s)
 133 AbstractCompiler* CompileBroker::_compilers[2];
 134 
 135 // These counters are used to assign an unique ID to each compilation.
 136 volatile jint CompileBroker::_compilation_id     = 0;
 137 volatile jint CompileBroker::_osr_compilation_id = 0;
 138 
 139 // Debugging information
 140 int  CompileBroker::_last_compile_type     = no_compile;
 141 int  CompileBroker::_last_compile_level    = CompLevel_none;
 142 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
 143 
 144 // Performance counters
 145 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
 146 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
 147 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
 148 
 149 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
 150 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
 151 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
 152 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
 153 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
 154 
 155 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
 156 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
 157 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
 158 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
 159 
 160 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
 161 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
 162 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
 163 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;
 164 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;
 165 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;
 166 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;
 167 
 168 // Timers and counters for generating statistics
 169 elapsedTimer CompileBroker::_t_total_compilation;
 170 elapsedTimer CompileBroker::_t_osr_compilation;
 171 elapsedTimer CompileBroker::_t_standard_compilation;
 172 
 173 int CompileBroker::_total_bailout_count          = 0;
 174 int CompileBroker::_total_invalidated_count      = 0;
 175 int CompileBroker::_total_compile_count          = 0;
 176 int CompileBroker::_total_osr_compile_count      = 0;
 177 int CompileBroker::_total_standard_compile_count = 0;
 178 
 179 int CompileBroker::_sum_osr_bytes_compiled       = 0;
 180 int CompileBroker::_sum_standard_bytes_compiled  = 0;
 181 int CompileBroker::_sum_nmethod_size             = 0;
 182 int CompileBroker::_sum_nmethod_code_size        = 0;
 183 
 184 long CompileBroker::_peak_compilation_time       = 0;
 185 
 186 CompileQueue* CompileBroker::_c2_compile_queue   = NULL;
 187 CompileQueue* CompileBroker::_c1_compile_queue   = 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         p2i(nm), p2i(nm->code_begin()), p2i(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     CompileTask::free(task);
 256   }
 257 }
 258 
 259 
 260 CompileTask*  CompileTask::_task_free_list = NULL;
 261 #ifdef ASSERT
 262 int CompileTask::_num_allocated_tasks = 0;
 263 #endif
 264 /**
 265  * Allocate a CompileTask, from the free list if possible.
 266  */
 267 CompileTask* CompileTask::allocate() {
 268   MutexLocker locker(CompileTaskAlloc_lock);
 269   CompileTask* task = NULL;
 270 
 271   if (_task_free_list != NULL) {
 272     task = _task_free_list;
 273     _task_free_list = task->next();
 274     task->set_next(NULL);
 275   } else {
 276     task = new CompileTask();
 277     DEBUG_ONLY(_num_allocated_tasks++;)
 278     assert (_num_allocated_tasks < 10000, "Leaking compilation tasks?");
 279     task->set_next(NULL);
 280     task->set_is_free(true);
 281   }
 282   assert(task->is_free(), "Task must be free.");
 283   task->set_is_free(false);
 284   return task;
 285 }
 286 
 287 
 288 /**
 289  * Add a task to the free list.
 290  */
 291 void CompileTask::free(CompileTask* task) {
 292   MutexLocker locker(CompileTaskAlloc_lock);
 293   if (!task->is_free()) {
 294     task->set_code(NULL);
 295     assert(!task->lock()->is_locked(), "Should not be locked when freed");
 296     JNIHandles::destroy_global(task->_method_holder);
 297     JNIHandles::destroy_global(task->_hot_method_holder);
 298 
 299     task->set_is_free(true);
 300     task->set_next(_task_free_list);
 301     _task_free_list = task;
 302   }
 303 }
 304 
 305 void CompileTask::initialize(int compile_id,
 306                              methodHandle method,
 307                              int osr_bci,
 308                              int comp_level,
 309                              methodHandle hot_method,
 310                              int hot_count,
 311                              const char* comment,
 312                              bool is_blocking) {
 313   assert(!_lock->is_locked(), "bad locking");
 314 
 315   _compile_id = compile_id;
 316   _method = method();
 317   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());
 318   _osr_bci = osr_bci;
 319   _is_blocking = is_blocking;
 320   _comp_level = comp_level;
 321   _num_inlined_bytecodes = 0;
 322 
 323   _is_complete = false;
 324   _is_success = false;
 325   _code_handle = NULL;
 326 
 327   _hot_method = NULL;
 328   _hot_method_holder = NULL;
 329   _hot_count = hot_count;
 330   _time_queued = 0;  // tidy
 331   _comment = comment;
 332   _failure_reason = NULL;
 333 
 334   if (LogCompilation) {
 335     _time_queued = os::elapsed_counter();
 336     if (hot_method.not_null()) {
 337       if (hot_method == method) {
 338         _hot_method = _method;
 339       } else {
 340         _hot_method = hot_method();
 341         // only add loader or mirror if different from _method_holder
 342         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());
 343       }
 344     }
 345   }
 346 
 347   _next = NULL;
 348 }
 349 
 350 // ------------------------------------------------------------------
 351 // CompileTask::code/set_code
 352 nmethod* CompileTask::code() const {
 353   if (_code_handle == NULL)  return NULL;
 354   return _code_handle->code();
 355 }
 356 void CompileTask::set_code(nmethod* nm) {
 357   if (_code_handle == NULL && nm == NULL)  return;
 358   guarantee(_code_handle != NULL, "");
 359   _code_handle->set_code(nm);
 360   if (nm == NULL)  _code_handle = NULL;  // drop the handle also
 361 }
 362 
 363 
 364 void CompileTask::mark_on_stack() {
 365   // Mark these methods as something redefine classes cannot remove.
 366   _method->set_on_stack(true);
 367   if (_hot_method != NULL) {
 368     _hot_method->set_on_stack(true);
 369   }
 370 }
 371 
 372 // ------------------------------------------------------------------
 373 // CompileTask::print
 374 void CompileTask::print() {
 375   tty->print("<CompileTask compile_id=%d ", _compile_id);
 376   tty->print("method=");
 377   _method->print_name(tty);
 378   tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",
 379              _osr_bci, bool_to_str(_is_blocking),
 380              bool_to_str(_is_complete), bool_to_str(_is_success));
 381 }
 382 
 383 
 384 // ------------------------------------------------------------------
 385 // CompileTask::print_line_on_error
 386 //
 387 // This function is called by fatal error handler when the thread
 388 // causing troubles is a compiler thread.
 389 //
 390 // Do not grab any lock, do not allocate memory.
 391 //
 392 // Otherwise it's the same as CompileTask::print_line()
 393 //
 394 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {
 395   // print compiler name
 396   st->print("%s:", CompileBroker::compiler_name(comp_level()));
 397   print_compilation(st);
 398 }
 399 
 400 // ------------------------------------------------------------------
 401 // CompileTask::print_line
 402 void CompileTask::print_line() {
 403   ttyLocker ttyl;  // keep the following output all in one block
 404   // print compiler name if requested
 405   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));
 406   print_compilation();
 407 }
 408 
 409 
 410 // ------------------------------------------------------------------
 411 // CompileTask::print_compilation_impl
 412 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,
 413                                          bool is_osr_method, int osr_bci, bool is_blocking,
 414                                          const char* msg, bool short_form) {
 415   if (!short_form) {
 416     st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp
 417   }
 418   st->print("%4d ", compile_id);    // print compilation number
 419 
 420   // For unloaded methods the transition to zombie occurs after the
 421   // method is cleared so it's impossible to report accurate
 422   // information for that case.
 423   bool is_synchronized = false;
 424   bool has_exception_handler = false;
 425   bool is_native = false;
 426   if (method != NULL) {
 427     is_synchronized       = method->is_synchronized();
 428     has_exception_handler = method->has_exception_handler();
 429     is_native             = method->is_native();
 430   }
 431   // method attributes
 432   const char compile_type   = is_osr_method                   ? '%' : ' ';
 433   const char sync_char      = is_synchronized                 ? 's' : ' ';
 434   const char exception_char = has_exception_handler           ? '!' : ' ';
 435   const char blocking_char  = is_blocking                     ? 'b' : ' ';
 436   const char native_char    = is_native                       ? 'n' : ' ';
 437 
 438   // print method attributes
 439   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);
 440 
 441   if (TieredCompilation) {
 442     if (comp_level != -1)  st->print("%d ", comp_level);
 443     else                   st->print("- ");
 444   }
 445   st->print("     ");  // more indent
 446 
 447   if (method == NULL) {
 448     st->print("(method)");
 449   } else {
 450     method->print_short_name(st);
 451     if (is_osr_method) {
 452       st->print(" @ %d", osr_bci);
 453     }
 454     if (method->is_native())
 455       st->print(" (native)");
 456     else
 457       st->print(" (%d bytes)", method->code_size());
 458   }
 459 
 460   if (msg != NULL) {
 461     st->print("   %s", msg);
 462   }
 463   if (!short_form) {
 464     st->cr();
 465   }
 466 }
 467 
 468 // ------------------------------------------------------------------
 469 // CompileTask::print_inlining
 470 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {
 471   //         1234567
 472   st->print("        ");     // print timestamp
 473   //         1234
 474   st->print("     ");        // print compilation number
 475 
 476   // method attributes
 477   if (method->is_loaded()) {
 478     const char sync_char      = method->is_synchronized()        ? 's' : ' ';
 479     const char exception_char = method->has_exception_handlers() ? '!' : ' ';
 480     const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';
 481 
 482     // print method attributes
 483     st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);
 484   } else {
 485     //         %s!bn
 486     st->print("      ");     // print method attributes
 487   }
 488 
 489   if (TieredCompilation) {
 490     st->print("  ");
 491   }
 492   st->print("     ");        // more indent
 493   st->print("    ");         // initial inlining indent
 494 
 495   for (int i = 0; i < inline_level; i++)  st->print("  ");
 496 
 497   st->print("@ %d  ", bci);  // print bci
 498   method->print_short_name(st);
 499   if (method->is_loaded())
 500     st->print(" (%d bytes)", method->code_size());
 501   else
 502     st->print(" (not loaded)");
 503 
 504   if (msg != NULL) {
 505     st->print("   %s", msg);
 506   }
 507   st->cr();
 508 }
 509 
 510 // ------------------------------------------------------------------
 511 // CompileTask::print_inline_indent
 512 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {
 513   //         1234567
 514   st->print("        ");     // print timestamp
 515   //         1234
 516   st->print("     ");        // print compilation number
 517   //         %s!bn
 518   st->print("      ");       // print method attributes
 519   if (TieredCompilation) {
 520     st->print("  ");
 521   }
 522   st->print("     ");        // more indent
 523   st->print("    ");         // initial inlining indent
 524   for (int i = 0; i < inline_level; i++)  st->print("  ");
 525 }
 526 
 527 // ------------------------------------------------------------------
 528 // CompileTask::print_compilation
 529 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {
 530   bool is_osr_method = osr_bci() != InvocationEntryBci;
 531   print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);
 532 }
 533 
 534 // ------------------------------------------------------------------
 535 // CompileTask::log_task
 536 void CompileTask::log_task(xmlStream* log) {
 537   Thread* thread = Thread::current();
 538   methodHandle method(thread, this->method());
 539   ResourceMark rm(thread);
 540 
 541   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
 542   log->print(" compile_id='%d'", _compile_id);
 543   if (_osr_bci != CompileBroker::standard_entry_bci) {
 544     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind
 545   } // else compile_kind='c2c'
 546   if (!method.is_null())  log->method(method);
 547   if (_osr_bci != CompileBroker::standard_entry_bci) {
 548     log->print(" osr_bci='%d'", _osr_bci);
 549   }
 550   if (_comp_level != CompLevel_highest_tier) {
 551     log->print(" level='%d'", _comp_level);
 552   }
 553   if (_is_blocking) {
 554     log->print(" blocking='1'");
 555   }
 556   log->stamp();
 557 }
 558 
 559 
 560 // ------------------------------------------------------------------
 561 // CompileTask::log_task_queued
 562 void CompileTask::log_task_queued() {
 563   Thread* thread = Thread::current();
 564   ttyLocker ttyl;
 565   ResourceMark rm(thread);
 566 
 567   xtty->begin_elem("task_queued");
 568   log_task(xtty);
 569   if (_comment != NULL) {
 570     xtty->print(" comment='%s'", _comment);
 571   }
 572   if (_hot_method != NULL) {
 573     methodHandle hot(thread, _hot_method);
 574     methodHandle method(thread, _method);
 575     if (hot() != method()) {
 576       xtty->method(hot);
 577     }
 578   }
 579   if (_hot_count != 0) {
 580     xtty->print(" hot_count='%d'", _hot_count);
 581   }
 582   xtty->end_elem();
 583 }
 584 
 585 
 586 // ------------------------------------------------------------------
 587 // CompileTask::log_task_start
 588 void CompileTask::log_task_start(CompileLog* log)   {
 589   log->begin_head("task");
 590   log_task(log);
 591   log->end_head();
 592 }
 593 
 594 
 595 // ------------------------------------------------------------------
 596 // CompileTask::log_task_done
 597 void CompileTask::log_task_done(CompileLog* log) {
 598   Thread* thread = Thread::current();
 599   methodHandle method(thread, this->method());
 600   ResourceMark rm(thread);
 601 
 602   if (!_is_success) {
 603     const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";
 604     log->elem("failure reason='%s'", reason);
 605   }
 606 
 607   // <task_done ... stamp='1.234'>  </task>
 608   nmethod* nm = code();
 609   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",
 610                   _is_success, nm == NULL ? 0 : nm->content_size(),
 611                   method->invocation_count());
 612   int bec = method->backedge_count();
 613   if (bec != 0)  log->print(" backedge_count='%d'", bec);
 614   // Note:  "_is_complete" is about to be set, but is not.
 615   if (_num_inlined_bytecodes != 0) {
 616     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);
 617   }
 618   log->stamp();
 619   log->end_elem();
 620   log->tail("task");
 621   log->clear_identities();   // next task will have different CI
 622   if (log->unflushed_count() > 2000) {
 623     log->flush();
 624   }
 625   log->mark_file_end();
 626 }
 627 
 628 
 629 
 630 /**
 631  * Add a CompileTask to a CompileQueue
 632  */
 633 void CompileQueue::add(CompileTask* task) {
 634   assert(lock()->owned_by_self(), "must own lock");
 635   assert(!CompileBroker::is_compilation_disabled_forever(), "Do not add task if compilation is turned off forever");
 636 
 637   task->set_next(NULL);
 638   task->set_prev(NULL);
 639 
 640   if (_last == NULL) {
 641     // The compile queue is empty.
 642     assert(_first == NULL, "queue is empty");
 643     _first = task;
 644     _last = task;
 645   } else {
 646     // Append the task to the queue.
 647     assert(_last->next() == NULL, "not last");
 648     _last->set_next(task);
 649     task->set_prev(_last);
 650     _last = task;
 651   }
 652   ++_size;
 653 
 654   // Mark the method as being in the compile queue.
 655   task->method()->set_queued_for_compilation();
 656 
 657   NOT_PRODUCT(print();)
 658 
 659   if (LogCompilation && xtty != NULL) {
 660     task->log_task_queued();
 661   }
 662 
 663   // Notify CompilerThreads that a task is available.
 664   lock()->notify_all();
 665 }
 666 
 667 /**
 668  * Empties compilation queue by putting all compilation tasks onto
 669  * a freelist. Furthermore, the method wakes up all threads that are
 670  * waiting on a compilation task to finish. This can happen if background
 671  * compilation is disabled.
 672  */
 673 void CompileQueue::free_all() {
 674   MutexLocker mu(lock());
 675   CompileTask* next = _first;
 676 
 677   // Iterate over all tasks in the compile queue
 678   while (next != NULL) {
 679     CompileTask* current = next;
 680     next = current->next();
 681     {
 682       // Wake up thread that blocks on the compile task.
 683       MutexLocker ct_lock(current->lock());
 684       current->lock()->notify();
 685     }
 686     // Put the task back on the freelist.
 687     CompileTask::free(current);
 688   }
 689   _first = NULL;
 690 
 691   // Wake up all threads that block on the queue.
 692   lock()->notify_all();
 693 }
 694 
 695 // ------------------------------------------------------------------
 696 // CompileQueue::get
 697 //
 698 // Get the next CompileTask from a CompileQueue
 699 CompileTask* CompileQueue::get() {
 700   NMethodSweeper::possibly_sweep();
 701 
 702   MutexLocker locker(lock());
 703   // If _first is NULL we have no more compile jobs. There are two reasons for
 704   // having no compile jobs: First, we compiled everything we wanted. Second,
 705   // we ran out of code cache so compilation has been disabled. In the latter
 706   // case we perform code cache sweeps to free memory such that we can re-enable
 707   // compilation.
 708   while (_first == NULL) {
 709     // Exit loop if compilation is disabled forever
 710     if (CompileBroker::is_compilation_disabled_forever()) {
 711       return NULL;
 712     }
 713 
 714     if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {
 715       // Wait a certain amount of time to possibly do another sweep.
 716       // We must wait until stack scanning has happened so that we can
 717       // transition a method's state from 'not_entrant' to 'zombie'.
 718       long wait_time = NmethodSweepCheckInterval * 1000;
 719       if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {
 720         // Only one thread at a time can do sweeping. Scale the
 721         // wait time according to the number of compiler threads.
 722         // As a result, the next sweep is likely to happen every 100ms
 723         // with an arbitrary number of threads that do sweeping.
 724         wait_time = 100 * CICompilerCount;
 725       }
 726       bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);
 727       if (timeout) {
 728         MutexUnlocker ul(lock());
 729         NMethodSweeper::possibly_sweep();
 730       }
 731     } else {
 732       // If there are no compilation tasks and we can compile new jobs
 733       // (i.e., there is enough free space in the code cache) there is
 734       // no need to invoke the sweeper. As a result, the hotness of methods
 735       // remains unchanged. This behavior is desired, since we want to keep
 736       // the stable state, i.e., we do not want to evict methods from the
 737       // code cache if it is unnecessary.
 738       // We need a timed wait here, since compiler threads can exit if compilation
 739       // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
 740       // is not critical and we do not want idle compiler threads to wake up too often.
 741       lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
 742     }
 743   }
 744 
 745   if (CompileBroker::is_compilation_disabled_forever()) {
 746     return NULL;
 747   }
 748 
 749   CompileTask* task;
 750   {
 751     No_Safepoint_Verifier nsv;
 752     task = CompilationPolicy::policy()->select_task(this);
 753   }
 754   if (task != NULL) {
 755     remove(task);
 756   }
 757   purge_stale_tasks(); // may temporarily release MCQ lock
 758   return task;
 759 }
 760 
 761 // Clean & deallocate stale compile tasks.
 762 // Temporarily releases MethodCompileQueue lock.
 763 void CompileQueue::purge_stale_tasks() {
 764   assert(lock()->owned_by_self(), "must own lock");
 765   if (_first_stale != NULL) {
 766     // Stale tasks are purged when MCQ lock is released,
 767     // but _first_stale updates are protected by MCQ lock.
 768     // Once task processing starts and MCQ lock is released,
 769     // other compiler threads can reuse _first_stale.
 770     CompileTask* head = _first_stale;
 771     _first_stale = NULL;
 772     {
 773       MutexUnlocker ul(lock());
 774       for (CompileTask* task = head; task != NULL; ) {
 775         CompileTask* next_task = task->next();
 776         CompileTaskWrapper ctw(task); // Frees the task
 777         task->set_failure_reason("stale task");
 778         task = next_task;
 779       }
 780     }
 781   }
 782 }
 783 
 784 void CompileQueue::remove(CompileTask* task) {
 785    assert(lock()->owned_by_self(), "must own lock");
 786   if (task->prev() != NULL) {
 787     task->prev()->set_next(task->next());
 788   } else {
 789     // max is the first element
 790     assert(task == _first, "Sanity");
 791     _first = task->next();
 792   }
 793 
 794   if (task->next() != NULL) {
 795     task->next()->set_prev(task->prev());
 796   } else {
 797     // max is the last element
 798     assert(task == _last, "Sanity");
 799     _last = task->prev();
 800   }
 801   --_size;
 802 }
 803 
 804 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
 805   assert(lock()->owned_by_self(), "must own lock");
 806   remove(task);
 807 
 808   // Enqueue the task for reclamation (should be done outside MCQ lock)
 809   task->set_next(_first_stale);
 810   task->set_prev(NULL);
 811   _first_stale = task;
 812 }
 813 
 814 // methods in the compile queue need to be marked as used on the stack
 815 // so that they don't get reclaimed by Redefine Classes
 816 void CompileQueue::mark_on_stack() {
 817   CompileTask* task = _first;
 818   while (task != NULL) {
 819     task->mark_on_stack();
 820     task = task->next();
 821   }
 822 }
 823 
 824 #ifndef PRODUCT
 825 /**
 826  * Print entire compilation queue.
 827  */
 828 void CompileQueue::print() {
 829   if (CIPrintCompileQueue) {
 830     ttyLocker ttyl;
 831     tty->print_cr("Contents of %s", name());
 832     tty->print_cr("----------------------");
 833     CompileTask* task = _first;
 834     while (task != NULL) {
 835       task->print_line();
 836       task = task->next();
 837     }
 838     tty->print_cr("----------------------");
 839   }
 840 }
 841 #endif // PRODUCT
 842 
 843 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {
 844 
 845   _current_method[0] = '\0';
 846   _compile_type = CompileBroker::no_compile;
 847 
 848   if (UsePerfData) {
 849     ResourceMark rm;
 850 
 851     // create the thread instance name space string - don't create an
 852     // instance subspace if instance is -1 - keeps the adapterThread
 853     // counters  from having a ".0" namespace.
 854     const char* thread_i = (instance == -1) ? thread_name :
 855                       PerfDataManager::name_space(thread_name, instance);
 856 
 857 
 858     char* name = PerfDataManager::counter_name(thread_i, "method");
 859     _perf_current_method =
 860                PerfDataManager::create_string_variable(SUN_CI, name,
 861                                                        cmname_buffer_length,
 862                                                        _current_method, CHECK);
 863 
 864     name = PerfDataManager::counter_name(thread_i, "type");
 865     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,
 866                                                           PerfData::U_None,
 867                                                          (jlong)_compile_type,
 868                                                           CHECK);
 869 
 870     name = PerfDataManager::counter_name(thread_i, "time");
 871     _perf_time = PerfDataManager::create_counter(SUN_CI, name,
 872                                                  PerfData::U_Ticks, CHECK);
 873 
 874     name = PerfDataManager::counter_name(thread_i, "compiles");
 875     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,
 876                                                      PerfData::U_Events, CHECK);
 877   }
 878 }
 879 
 880 // ------------------------------------------------------------------
 881 // CompileBroker::compilation_init
 882 //
 883 // Initialize the Compilation object
 884 void CompileBroker::compilation_init() {
 885   _last_method_compiled[0] = '\0';
 886 
 887   // No need to initialize compilation system if we do not use it.
 888   if (!UseCompiler) {
 889     return;
 890   }
 891 #ifndef SHARK
 892   // Set the interface to the current compiler(s).
 893   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
 894   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
 895 #ifdef COMPILER1
 896   if (c1_count > 0) {
 897     _compilers[0] = new Compiler();
 898   }
 899 #endif // COMPILER1
 900 
 901 #ifdef COMPILER2
 902   if (c2_count > 0) {
 903     _compilers[1] = new C2Compiler();
 904   }
 905 #endif // COMPILER2
 906 
 907 #else // SHARK
 908   int c1_count = 0;
 909   int c2_count = 1;
 910 
 911   _compilers[1] = new SharkCompiler();
 912 #endif // SHARK
 913 
 914   // Start the CompilerThreads
 915   init_compiler_threads(c1_count, c2_count);
 916   // totalTime performance counter is always created as it is required
 917   // by the implementation of java.lang.management.CompilationMBean.
 918   {
 919     EXCEPTION_MARK;
 920     _perf_total_compilation =
 921                  PerfDataManager::create_counter(JAVA_CI, "totalTime",
 922                                                  PerfData::U_Ticks, CHECK);
 923   }
 924 
 925 
 926   if (UsePerfData) {
 927 
 928     EXCEPTION_MARK;
 929 
 930     // create the jvmstat performance counters
 931     _perf_osr_compilation =
 932                  PerfDataManager::create_counter(SUN_CI, "osrTime",
 933                                                  PerfData::U_Ticks, CHECK);
 934 
 935     _perf_standard_compilation =
 936                  PerfDataManager::create_counter(SUN_CI, "standardTime",
 937                                                  PerfData::U_Ticks, CHECK);
 938 
 939     _perf_total_bailout_count =
 940                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",
 941                                                  PerfData::U_Events, CHECK);
 942 
 943     _perf_total_invalidated_count =
 944                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
 945                                                  PerfData::U_Events, CHECK);
 946 
 947     _perf_total_compile_count =
 948                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",
 949                                                  PerfData::U_Events, CHECK);
 950     _perf_total_osr_compile_count =
 951                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",
 952                                                  PerfData::U_Events, CHECK);
 953 
 954     _perf_total_standard_compile_count =
 955                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",
 956                                                  PerfData::U_Events, CHECK);
 957 
 958     _perf_sum_osr_bytes_compiled =
 959                  PerfDataManager::create_counter(SUN_CI, "osrBytes",
 960                                                  PerfData::U_Bytes, CHECK);
 961 
 962     _perf_sum_standard_bytes_compiled =
 963                  PerfDataManager::create_counter(SUN_CI, "standardBytes",
 964                                                  PerfData::U_Bytes, CHECK);
 965 
 966     _perf_sum_nmethod_size =
 967                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",
 968                                                  PerfData::U_Bytes, CHECK);
 969 
 970     _perf_sum_nmethod_code_size =
 971                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
 972                                                  PerfData::U_Bytes, CHECK);
 973 
 974     _perf_last_method =
 975                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
 976                                        CompilerCounters::cmname_buffer_length,
 977                                        "", CHECK);
 978 
 979     _perf_last_failed_method =
 980             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
 981                                        CompilerCounters::cmname_buffer_length,
 982                                        "", CHECK);
 983 
 984     _perf_last_invalidated_method =
 985         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
 986                                      CompilerCounters::cmname_buffer_length,
 987                                      "", CHECK);
 988 
 989     _perf_last_compile_type =
 990              PerfDataManager::create_variable(SUN_CI, "lastType",
 991                                               PerfData::U_None,
 992                                               (jlong)CompileBroker::no_compile,
 993                                               CHECK);
 994 
 995     _perf_last_compile_size =
 996              PerfDataManager::create_variable(SUN_CI, "lastSize",
 997                                               PerfData::U_Bytes,
 998                                               (jlong)CompileBroker::no_compile,
 999                                               CHECK);
1000 
1001 
1002     _perf_last_failed_type =
1003              PerfDataManager::create_variable(SUN_CI, "lastFailedType",
1004                                               PerfData::U_None,
1005                                               (jlong)CompileBroker::no_compile,
1006                                               CHECK);
1007 
1008     _perf_last_invalidated_type =
1009          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
1010                                           PerfData::U_None,
1011                                           (jlong)CompileBroker::no_compile,
1012                                           CHECK);
1013   }
1014 
1015   _initialized = true;
1016 }
1017 
1018 
1019 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,
1020                                                     AbstractCompiler* comp, TRAPS) {
1021   CompilerThread* compiler_thread = NULL;
1022 
1023   Klass* k =
1024     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),
1025                                       true, CHECK_0);
1026   instanceKlassHandle klass (THREAD, k);
1027   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);
1028   Handle string = java_lang_String::create_from_str(name, CHECK_0);
1029 
1030   // Initialize thread_oop to put it into the system threadGroup
1031   Handle thread_group (THREAD,  Universe::system_thread_group());
1032   JavaValue result(T_VOID);
1033   JavaCalls::call_special(&result, thread_oop,
1034                        klass,
1035                        vmSymbols::object_initializer_name(),
1036                        vmSymbols::threadgroup_string_void_signature(),
1037                        thread_group,
1038                        string,
1039                        CHECK_0);
1040 
1041   {
1042     MutexLocker mu(Threads_lock, THREAD);
1043     compiler_thread = new CompilerThread(queue, counters);
1044     // At this point the new CompilerThread data-races with this startup
1045     // thread (which I believe is the primoridal thread and NOT the VM
1046     // thread).  This means Java bytecodes being executed at startup can
1047     // queue compile jobs which will run at whatever default priority the
1048     // newly created CompilerThread runs at.
1049 
1050 
1051     // At this point it may be possible that no osthread was created for the
1052     // JavaThread due to lack of memory. We would have to throw an exception
1053     // in that case. However, since this must work and we do not allow
1054     // exceptions anyway, check and abort if this fails.
1055 
1056     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){
1057       vm_exit_during_initialization("java.lang.OutOfMemoryError",
1058                                     "unable to create new native thread");
1059     }
1060 
1061     java_lang_Thread::set_thread(thread_oop(), compiler_thread);
1062 
1063     // Note that this only sets the JavaThread _priority field, which by
1064     // definition is limited to Java priorities and not OS priorities.
1065     // The os-priority is set in the CompilerThread startup code itself
1066 
1067     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1068 
1069     // Note that we cannot call os::set_priority because it expects Java
1070     // priorities and we are *explicitly* using OS priorities so that it's
1071     // possible to set the compiler thread priority higher than any Java
1072     // thread.
1073 
1074     int native_prio = CompilerThreadPriority;
1075     if (native_prio == -1) {
1076       if (UseCriticalCompilerThreadPriority) {
1077         native_prio = os::java_to_os_priority[CriticalPriority];
1078       } else {
1079         native_prio = os::java_to_os_priority[NearMaxPriority];
1080       }
1081     }
1082     os::set_native_priority(compiler_thread, native_prio);
1083 
1084     java_lang_Thread::set_daemon(thread_oop());
1085 
1086     compiler_thread->set_threadObj(thread_oop());
1087     compiler_thread->set_compiler(comp);
1088     Threads::add(compiler_thread);
1089     Thread::start(compiler_thread);
1090   }
1091 
1092   // Let go of Threads_lock before yielding
1093   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1094 
1095   return compiler_thread;
1096 }
1097 
1098 
1099 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
1100   EXCEPTION_MARK;
1101 #if !defined(ZERO) && !defined(SHARK)
1102   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
1103 #endif // !ZERO && !SHARK
1104   // Initialize the compilation queue
1105   if (c2_compiler_count > 0) {
1106     _c2_compile_queue  = new CompileQueue("C2 CompileQueue",  MethodCompileQueue_lock);
1107     _compilers[1]->set_num_compiler_threads(c2_compiler_count);
1108   }
1109   if (c1_compiler_count > 0) {
1110     _c1_compile_queue  = new CompileQueue("C1 CompileQueue",  MethodCompileQueue_lock);
1111     _compilers[0]->set_num_compiler_threads(c1_compiler_count);
1112   }
1113 
1114   int compiler_count = c1_compiler_count + c2_compiler_count;
1115 
1116   _compiler_threads =
1117     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);
1118 
1119   char name_buffer[256];
1120   for (int i = 0; i < c2_compiler_count; i++) {
1121     // Create a name for our thread.
1122     sprintf(name_buffer, "C2 CompilerThread%d", i);
1123     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1124     // Shark and C2
1125     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_compile_queue, counters, _compilers[1], CHECK);
1126     _compiler_threads->append(new_thread);
1127   }
1128 
1129   for (int i = c2_compiler_count; i < compiler_count; i++) {
1130     // Create a name for our thread.
1131     sprintf(name_buffer, "C1 CompilerThread%d", i);
1132     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);
1133     // C1
1134     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_compile_queue, counters, _compilers[0], CHECK);
1135     _compiler_threads->append(new_thread);
1136   }
1137 
1138   if (UsePerfData) {
1139     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);
1140   }
1141 }
1142 
1143 
1144 /**
1145  * Set the methods on the stack as on_stack so that redefine classes doesn't
1146  * reclaim them. This method is executed at a safepoint.
1147  */
1148 void CompileBroker::mark_on_stack() {
1149   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1150   // Since we are at a safepoint, we do not need a lock to access
1151   // the compile queues.
1152   if (_c2_compile_queue != NULL) {
1153     _c2_compile_queue->mark_on_stack();
1154   }
1155   if (_c1_compile_queue != NULL) {
1156     _c1_compile_queue->mark_on_stack();
1157   }
1158 }
1159 
1160 // ------------------------------------------------------------------
1161 // CompileBroker::compile_method
1162 //
1163 // Request compilation of a method.
1164 void CompileBroker::compile_method_base(methodHandle method,
1165                                         int osr_bci,
1166                                         int comp_level,
1167                                         methodHandle hot_method,
1168                                         int hot_count,
1169                                         const char* comment,
1170                                         Thread* thread) {
1171   // do nothing if compiler thread(s) is not available
1172   if (!_initialized) {
1173     return;
1174   }
1175 
1176   guarantee(!method->is_abstract(), "cannot compile abstract methods");
1177   assert(method->method_holder()->oop_is_instance(),
1178          "sanity check");
1179   assert(!method->method_holder()->is_not_initialized(),
1180          "method holder must be initialized");
1181   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1182 
1183   if (CIPrintRequests) {
1184     tty->print("request: ");
1185     method->print_short_name(tty);
1186     if (osr_bci != InvocationEntryBci) {
1187       tty->print(" osr_bci: %d", osr_bci);
1188     }
1189     tty->print(" comment: %s count: %d", comment, hot_count);
1190     if (!hot_method.is_null()) {
1191       tty->print(" hot: ");
1192       if (hot_method() != method()) {
1193           hot_method->print_short_name(tty);
1194       } else {
1195         tty->print("yes");
1196       }
1197     }
1198     tty->cr();
1199   }
1200 
1201   // A request has been made for compilation.  Before we do any
1202   // real work, check to see if the method has been compiled
1203   // in the meantime with a definitive result.
1204   if (compilation_is_complete(method, osr_bci, comp_level)) {
1205     return;
1206   }
1207 
1208 #ifndef PRODUCT
1209   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1210     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1211       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.
1212       return;
1213     }
1214   }
1215 #endif
1216 
1217   // If this method is already in the compile queue, then
1218   // we do not block the current thread.
1219   if (compilation_is_in_queue(method)) {
1220     // We may want to decay our counter a bit here to prevent
1221     // multiple denied requests for compilation.  This is an
1222     // open compilation policy issue. Note: The other possibility,
1223     // in the case that this is a blocking compile request, is to have
1224     // all subsequent blocking requesters wait for completion of
1225     // ongoing compiles. Note that in this case we'll need a protocol
1226     // for freeing the associated compile tasks. [Or we could have
1227     // a single static monitor on which all these waiters sleep.]
1228     return;
1229   }
1230 
1231   // If the requesting thread is holding the pending list lock
1232   // then we just return. We can't risk blocking while holding
1233   // the pending list lock or a 3-way deadlock may occur
1234   // between the reference handler thread, a GC (instigated
1235   // by a compiler thread), and compiled method registration.
1236   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {
1237     return;
1238   }
1239 
1240   if (TieredCompilation) {
1241     // Tiered policy requires MethodCounters to exist before adding a method to
1242     // the queue. Create if we don't have them yet.
1243     method->get_method_counters(thread);
1244   }
1245 
1246   // Outputs from the following MutexLocker block:
1247   CompileTask* task     = NULL;
1248   bool         blocking = false;
1249   CompileQueue* queue  = compile_queue(comp_level);
1250 
1251   // Acquire our lock.
1252   {
1253     MutexLocker locker(queue->lock(), thread);
1254 
1255     // Make sure the method has not slipped into the queues since
1256     // last we checked; note that those checks were "fast bail-outs".
1257     // Here we need to be more careful, see 14012000 below.
1258     if (compilation_is_in_queue(method)) {
1259       return;
1260     }
1261 
1262     // We need to check again to see if the compilation has
1263     // completed.  A previous compilation may have registered
1264     // some result.
1265     if (compilation_is_complete(method, osr_bci, comp_level)) {
1266       return;
1267     }
1268 
1269     // We now know that this compilation is not pending, complete,
1270     // or prohibited.  Assign a compile_id to this compilation
1271     // and check to see if it is in our [Start..Stop) range.
1272     int compile_id = assign_compile_id(method, osr_bci);
1273     if (compile_id == 0) {
1274       // The compilation falls outside the allowed range.
1275       return;
1276     }
1277 
1278     // Should this thread wait for completion of the compile?
1279     blocking = is_compile_blocking();
1280 
1281     // We will enter the compilation in the queue.
1282     // 14012000: Note that this sets the queued_for_compile bits in
1283     // the target method. We can now reason that a method cannot be
1284     // queued for compilation more than once, as follows:
1285     // Before a thread queues a task for compilation, it first acquires
1286     // the compile queue lock, then checks if the method's queued bits
1287     // are set or it has already been compiled. Thus there can not be two
1288     // instances of a compilation task for the same method on the
1289     // compilation queue. Consider now the case where the compilation
1290     // thread has already removed a task for that method from the queue
1291     // and is in the midst of compiling it. In this case, the
1292     // queued_for_compile bits must be set in the method (and these
1293     // will be visible to the current thread, since the bits were set
1294     // under protection of the compile queue lock, which we hold now.
1295     // When the compilation completes, the compiler thread first sets
1296     // the compilation result and then clears the queued_for_compile
1297     // bits. Neither of these actions are protected by a barrier (or done
1298     // under the protection of a lock), so the only guarantee we have
1299     // (on machines with TSO (Total Store Order)) is that these values
1300     // will update in that order. As a result, the only combinations of
1301     // these bits that the current thread will see are, in temporal order:
1302     // <RESULT, QUEUE> :
1303     //     <0, 1> : in compile queue, but not yet compiled
1304     //     <1, 1> : compiled but queue bit not cleared
1305     //     <1, 0> : compiled and queue bit cleared
1306     // Because we first check the queue bits then check the result bits,
1307     // we are assured that we cannot introduce a duplicate task.
1308     // Note that if we did the tests in the reverse order (i.e. check
1309     // result then check queued bit), we could get the result bit before
1310     // the compilation completed, and the queue bit after the compilation
1311     // completed, and end up introducing a "duplicate" (redundant) task.
1312     // In that case, the compiler thread should first check if a method
1313     // has already been compiled before trying to compile it.
1314     // NOTE: in the event that there are multiple compiler threads and
1315     // there is de-optimization/recompilation, things will get hairy,
1316     // and in that case it's best to protect both the testing (here) of
1317     // these bits, and their updating (here and elsewhere) under a
1318     // common lock.
1319     task = create_compile_task(queue,
1320                                compile_id, method,
1321                                osr_bci, comp_level,
1322                                hot_method, hot_count, comment,
1323                                blocking);
1324   }
1325 
1326   if (blocking) {
1327     wait_for_completion(task);
1328   }
1329 }
1330 
1331 
1332 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,
1333                                        int comp_level,
1334                                        methodHandle hot_method, int hot_count,
1335                                        const char* comment, Thread* THREAD) {
1336   // make sure arguments make sense
1337   assert(method->method_holder()->oop_is_instance(), "not an instance method");
1338   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1339   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1340   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1341   // allow any levels for WhiteBox
1342   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1343   // return quickly if possible
1344 
1345   // lock, make sure that the compilation
1346   // isn't prohibited in a straightforward way.
1347   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1348   if (comp == NULL || !comp->can_compile_method(method) ||
1349       compilation_is_prohibited(method, osr_bci, comp_level)) {
1350     return NULL;
1351   }
1352 
1353   if (osr_bci == InvocationEntryBci) {
1354     // standard compilation
1355     nmethod* method_code = method->code();
1356     if (method_code != NULL) {
1357       if (compilation_is_complete(method, osr_bci, comp_level)) {
1358         return method_code;
1359       }
1360     }
1361     if (method->is_not_compilable(comp_level)) {
1362       return NULL;
1363     }
1364   } else {
1365     // osr compilation
1366 #ifndef TIERED
1367     // seems like an assert of dubious value
1368     assert(comp_level == CompLevel_highest_tier,
1369            "all OSR compiles are assumed to be at a single compilation lavel");
1370 #endif // TIERED
1371     // We accept a higher level osr method
1372     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1373     if (nm != NULL) return nm;
1374     if (method->is_not_osr_compilable(comp_level)) return NULL;
1375   }
1376 
1377   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1378   // some prerequisites that are compiler specific
1379   if (comp->is_c2() || comp->is_shark()) {
1380     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1381     // Resolve all classes seen in the signature of the method
1382     // we are compiling.
1383     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1384   }
1385 
1386   // If the method is native, do the lookup in the thread requesting
1387   // the compilation. Native lookups can load code, which is not
1388   // permitted during compilation.
1389   //
1390   // Note: A native method implies non-osr compilation which is
1391   //       checked with an assertion at the entry of this method.
1392   if (method->is_native() && !method->is_method_handle_intrinsic()) {
1393     bool in_base_library;
1394     address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1395     if (HAS_PENDING_EXCEPTION) {
1396       // In case of an exception looking up the method, we just forget
1397       // about it. The interpreter will kick-in and throw the exception.
1398       method->set_not_compilable(); // implies is_not_osr_compilable()
1399       CLEAR_PENDING_EXCEPTION;
1400       return NULL;
1401     }
1402     assert(method->has_native_function(), "must have native code by now");
1403   }
1404 
1405   // RedefineClasses() has replaced this method; just return
1406   if (method->is_old()) {
1407     return NULL;
1408   }
1409 
1410   // JVMTI -- post_compile_event requires jmethod_id() that may require
1411   // a lock the compiling thread can not acquire. Prefetch it here.
1412   if (JvmtiExport::should_post_compiled_method_load()) {
1413     method->jmethod_id();
1414   }
1415 
1416   // do the compilation
1417   if (method->is_native()) {
1418     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1419       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1420       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1421       //
1422       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1423       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.
1424       AdapterHandlerLibrary::create_native_wrapper(method);
1425     } else {
1426       return NULL;
1427     }
1428   } else {
1429     // If the compiler is shut off due to code cache getting full
1430     // fail out now so blocking compiles dont hang the java thread
1431     if (!should_compile_new_jobs()) {
1432       CompilationPolicy::policy()->delay_compilation(method());
1433       return NULL;
1434     }
1435     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);
1436   }
1437 
1438   // return requested nmethod
1439   // We accept a higher level osr method
1440   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1441 }
1442 
1443 
1444 // ------------------------------------------------------------------
1445 // CompileBroker::compilation_is_complete
1446 //
1447 // See if compilation of this method is already complete.
1448 bool CompileBroker::compilation_is_complete(methodHandle method,
1449                                             int          osr_bci,
1450                                             int          comp_level) {
1451   bool is_osr = (osr_bci != standard_entry_bci);
1452   if (is_osr) {
1453     if (method->is_not_osr_compilable(comp_level)) {
1454       return true;
1455     } else {
1456       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1457       return (result != NULL);
1458     }
1459   } else {
1460     if (method->is_not_compilable(comp_level)) {
1461       return true;
1462     } else {
1463       nmethod* result = method->code();
1464       if (result == NULL) return false;
1465       return comp_level == result->comp_level();
1466     }
1467   }
1468 }
1469 
1470 
1471 /**
1472  * See if this compilation is already requested.
1473  *
1474  * Implementation note: there is only a single "is in queue" bit
1475  * for each method.  This means that the check below is overly
1476  * conservative in the sense that an osr compilation in the queue
1477  * will block a normal compilation from entering the queue (and vice
1478  * versa).  This can be remedied by a full queue search to disambiguate
1479  * cases.  If it is deemed profitable, this may be done.
1480  */
1481 bool CompileBroker::compilation_is_in_queue(methodHandle method) {
1482   return method->queued_for_compilation();
1483 }
1484 
1485 // ------------------------------------------------------------------
1486 // CompileBroker::compilation_is_prohibited
1487 //
1488 // See if this compilation is not allowed.
1489 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {
1490   bool is_native = method->is_native();
1491   // Some compilers may not support the compilation of natives.
1492   AbstractCompiler *comp = compiler(comp_level);
1493   if (is_native &&
1494       (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1495     method->set_not_compilable_quietly(comp_level);
1496     return true;
1497   }
1498 
1499   bool is_osr = (osr_bci != standard_entry_bci);
1500   // Some compilers may not support on stack replacement.
1501   if (is_osr &&
1502       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1503     method->set_not_osr_compilable(comp_level);
1504     return true;
1505   }
1506 
1507   // The method may be explicitly excluded by the user.
1508   bool quietly;
1509   if (CompilerOracle::should_exclude(method, quietly)) {
1510     if (!quietly) {
1511       // This does not happen quietly...
1512       ResourceMark rm;
1513       tty->print("### Excluding %s:%s",
1514                  method->is_native() ? "generation of native wrapper" : "compile",
1515                  (method->is_static() ? " static" : ""));
1516       method->print_short_name(tty);
1517       tty->cr();
1518     }
1519     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");
1520   }
1521 
1522   return false;
1523 }
1524 
1525 /**
1526  * Generate serialized IDs for compilation requests. If certain debugging flags are used
1527  * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1528  * The function also allows to generate separate compilation IDs for OSR compilations.
1529  */
1530 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
1531 #ifdef ASSERT
1532   bool is_osr = (osr_bci != standard_entry_bci);
1533   int id;
1534   if (method->is_native()) {
1535     assert(!is_osr, "can't be osr");
1536     // Adapters, native wrappers and method handle intrinsics
1537     // should be generated always.
1538     return Atomic::add(1, &_compilation_id);
1539   } else if (CICountOSR && is_osr) {
1540     id = Atomic::add(1, &_osr_compilation_id);
1541     if (CIStartOSR <= id && id < CIStopOSR) {
1542       return id;
1543     }
1544   } else {
1545     id = Atomic::add(1, &_compilation_id);
1546     if (CIStart <= id && id < CIStop) {
1547       return id;
1548     }
1549   }
1550 
1551   // Method was not in the appropriate compilation range.
1552   method->set_not_compilable_quietly();
1553   return 0;
1554 #else
1555   // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1556   // only _compilation_id is incremented.
1557   return Atomic::add(1, &_compilation_id);
1558 #endif
1559 }
1560 
1561 /**
1562  * Should the current thread block until this compilation request
1563  * has been fulfilled?
1564  */
1565 bool CompileBroker::is_compile_blocking() {
1566   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");
1567   return !BackgroundCompilation;
1568 }
1569 
1570 
1571 // ------------------------------------------------------------------
1572 // CompileBroker::preload_classes
1573 void CompileBroker::preload_classes(methodHandle method, TRAPS) {
1574   // Move this code over from c1_Compiler.cpp
1575   ShouldNotReachHere();
1576 }
1577 
1578 
1579 // ------------------------------------------------------------------
1580 // CompileBroker::create_compile_task
1581 //
1582 // Create a CompileTask object representing the current request for
1583 // compilation.  Add this task to the queue.
1584 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1585                                               int           compile_id,
1586                                               methodHandle  method,
1587                                               int           osr_bci,
1588                                               int           comp_level,
1589                                               methodHandle  hot_method,
1590                                               int           hot_count,
1591                                               const char*   comment,
1592                                               bool          blocking) {
1593   CompileTask* new_task = CompileTask::allocate();
1594   new_task->initialize(compile_id, method, osr_bci, comp_level,
1595                        hot_method, hot_count, comment,
1596                        blocking);
1597   queue->add(new_task);
1598   return new_task;
1599 }
1600 
1601 
1602 /**
1603  *  Wait for the compilation task to complete.
1604  */
1605 void CompileBroker::wait_for_completion(CompileTask* task) {
1606   if (CIPrintCompileQueue) {
1607     ttyLocker ttyl;
1608     tty->print_cr("BLOCKING FOR COMPILE");
1609   }
1610 
1611   assert(task->is_blocking(), "can only wait on blocking task");
1612 
1613   JavaThread* thread = JavaThread::current();
1614   thread->set_blocked_on_compilation(true);
1615 
1616   methodHandle method(thread, task->method());
1617   {
1618     MutexLocker waiter(task->lock(), thread);
1619 
1620     while (!task->is_complete() && !is_compilation_disabled_forever()) {
1621       task->lock()->wait();
1622     }
1623   }
1624 
1625   thread->set_blocked_on_compilation(false);
1626   if (is_compilation_disabled_forever()) {
1627     CompileTask::free(task);
1628     return;
1629   }
1630 
1631   // It is harmless to check this status without the lock, because
1632   // completion is a stable property (until the task object is recycled).
1633   assert(task->is_complete(), "Compilation should have completed");
1634   assert(task->code_handle() == NULL, "must be reset");
1635 
1636   // By convention, the waiter is responsible for recycling a
1637   // blocking CompileTask. Since there is only one waiter ever
1638   // waiting on a CompileTask, we know that no one else will
1639   // be using this CompileTask; we can free it.
1640   CompileTask::free(task);
1641 }
1642 
1643 /**
1644  * Initialize compiler thread(s) + compiler object(s). The postcondition
1645  * of this function is that the compiler runtimes are initialized and that
1646  * compiler threads can start compiling.
1647  */
1648 bool CompileBroker::init_compiler_runtime() {
1649   CompilerThread* thread = CompilerThread::current();
1650   AbstractCompiler* comp = thread->compiler();
1651   // Final sanity check - the compiler object must exist
1652   guarantee(comp != NULL, "Compiler object must exist");
1653 
1654   int system_dictionary_modification_counter;
1655   {
1656     MutexLocker locker(Compile_lock, thread);
1657     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1658   }
1659 
1660   {
1661     // Must switch to native to allocate ci_env
1662     ThreadToNativeFromVM ttn(thread);
1663     ciEnv ci_env(NULL, system_dictionary_modification_counter);
1664     // Cache Jvmti state
1665     ci_env.cache_jvmti_state();
1666     // Cache DTrace flags
1667     ci_env.cache_dtrace_flags();
1668 
1669     // Switch back to VM state to do compiler initialization
1670     ThreadInVMfromNative tv(thread);
1671     ResetNoHandleMark rnhm;
1672 
1673 
1674     if (!comp->is_shark()) {
1675       // Perform per-thread and global initializations
1676       comp->initialize();
1677     }
1678   }
1679 
1680   if (comp->is_failed()) {
1681     disable_compilation_forever();
1682     // If compiler initialization failed, no compiler thread that is specific to a
1683     // particular compiler runtime will ever start to compile methods.
1684     shutdown_compiler_runtime(comp, thread);
1685     return false;
1686   }
1687 
1688   // C1 specific check
1689   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1690     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1691     return false;
1692   }
1693 
1694   return true;
1695 }
1696 
1697 /**
1698  * If C1 and/or C2 initialization failed, we shut down all compilation.
1699  * We do this to keep things simple. This can be changed if it ever turns
1700  * out to be a problem.
1701  */
1702 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1703   // Free buffer blob, if allocated
1704   if (thread->get_buffer_blob() != NULL) {
1705     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1706     CodeCache::free(thread->get_buffer_blob());
1707   }
1708 
1709   if (comp->should_perform_shutdown()) {
1710     // There are two reasons for shutting down the compiler
1711     // 1) compiler runtime initialization failed
1712     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1713     warning("%s initialization failed. Shutting down all compilers", comp->name());
1714 
1715     // Only one thread per compiler runtime object enters here
1716     // Set state to shut down
1717     comp->set_shut_down();
1718 
1719     // Delete all queued compilation tasks to make compiler threads exit faster.
1720     if (_c1_compile_queue != NULL) {
1721       _c1_compile_queue->free_all();
1722     }
1723 
1724     if (_c2_compile_queue != NULL) {
1725       _c2_compile_queue->free_all();
1726     }
1727 
1728     // Set flags so that we continue execution with using interpreter only.
1729     UseCompiler    = false;
1730     UseInterpreter = true;
1731 
1732     // We could delete compiler runtimes also. However, there are references to
1733     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then
1734     // fail. This can be done later if necessary.
1735   }
1736 }
1737 
1738 // ------------------------------------------------------------------
1739 // CompileBroker::compiler_thread_loop
1740 //
1741 // The main loop run by a CompilerThread.
1742 void CompileBroker::compiler_thread_loop() {
1743   CompilerThread* thread = CompilerThread::current();
1744   CompileQueue* queue = thread->queue();
1745   // For the thread that initializes the ciObjectFactory
1746   // this resource mark holds all the shared objects
1747   ResourceMark rm;
1748 
1749   // First thread to get here will initialize the compiler interface
1750 
1751   if (!ciObjectFactory::is_initialized()) {
1752     ASSERT_IN_VM;
1753     MutexLocker only_one (CompileThread_lock, thread);
1754     if (!ciObjectFactory::is_initialized()) {
1755       ciObjectFactory::initialize();
1756     }
1757   }
1758 
1759   // Open a log.
1760   if (LogCompilation) {
1761     init_compiler_thread_log();
1762   }
1763   CompileLog* log = thread->log();
1764   if (log != NULL) {
1765     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1766                     thread->name(),
1767                     os::current_thread_id(),
1768                     os::current_process_id());
1769     log->stamp();
1770     log->end_elem();
1771   }
1772 
1773   // If compiler thread/runtime initialization fails, exit the compiler thread
1774   if (!init_compiler_runtime()) {
1775     return;
1776   }
1777 
1778   // Poll for new compilation tasks as long as the JVM runs. Compilation
1779   // should only be disabled if something went wrong while initializing the
1780   // compiler runtimes. This, in turn, should not happen. The only known case
1781   // when compiler runtime initialization fails is if there is not enough free
1782   // space in the code cache to generate the necessary stubs, etc.
1783   while (!is_compilation_disabled_forever()) {
1784     // We need this HandleMark to avoid leaking VM handles.
1785     HandleMark hm(thread);
1786 
1787     if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {
1788       // the code cache is really full
1789       handle_full_code_cache();
1790     }
1791 
1792     CompileTask* task = queue->get();
1793     if (task == NULL) {
1794       continue;
1795     }
1796 
1797     // Give compiler threads an extra quanta.  They tend to be bursty and
1798     // this helps the compiler to finish up the job.
1799     if( CompilerThreadHintNoPreempt )
1800       os::hint_no_preempt();
1801 
1802     // trace per thread time and compile statistics
1803     CompilerCounters* counters = ((CompilerThread*)thread)->counters();
1804     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());
1805 
1806     // Assign the task to the current thread.  Mark this compilation
1807     // thread as active for the profiler.
1808     CompileTaskWrapper ctw(task);
1809     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)
1810     task->set_code_handle(&result_handle);
1811     methodHandle method(thread, task->method());
1812 
1813     // Never compile a method if breakpoints are present in it
1814     if (method()->number_of_breakpoints() == 0) {
1815       // Compile the method.
1816       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1817         invoke_compiler_on_method(task);
1818       } else {
1819         // After compilation is disabled, remove remaining methods from queue
1820         method->clear_queued_for_compilation();
1821         task->set_failure_reason("compilation is disabled");
1822       }
1823     }
1824   }
1825 
1826   // Shut down compiler runtime
1827   shutdown_compiler_runtime(thread->compiler(), thread);
1828 }
1829 
1830 // ------------------------------------------------------------------
1831 // CompileBroker::init_compiler_thread_log
1832 //
1833 // Set up state required by +LogCompilation.
1834 void CompileBroker::init_compiler_thread_log() {
1835     CompilerThread* thread = CompilerThread::current();
1836     char  file_name[4*K];
1837     FILE* fp = NULL;
1838     intx thread_id = os::current_thread_id();
1839     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1840       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1841       if (dir == NULL) {
1842         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1843                      thread_id, os::current_process_id());
1844       } else {
1845         jio_snprintf(file_name, sizeof(file_name),
1846                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1847                      os::file_separator(), thread_id, os::current_process_id());
1848       }
1849 
1850       fp = fopen(file_name, "wt");
1851       if (fp != NULL) {
1852         if (LogCompilation && Verbose) {
1853           tty->print_cr("Opening compilation log %s", file_name);
1854         }
1855         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1856         if (log == NULL) {
1857           fclose(fp);
1858           return;
1859         }
1860         thread->init_log(log);
1861 
1862         if (xtty != NULL) {
1863           ttyLocker ttyl;
1864           // Record any per thread log files
1865           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1866         }
1867         return;
1868       }
1869     }
1870     warning("Cannot open log file: %s", file_name);
1871 }
1872 
1873 // ------------------------------------------------------------------
1874 // CompileBroker::set_should_block
1875 //
1876 // Set _should_block.
1877 // Call this from the VM, with Threads_lock held and a safepoint requested.
1878 void CompileBroker::set_should_block() {
1879   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1880   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1881 #ifndef PRODUCT
1882   if (PrintCompilation && (Verbose || WizardMode))
1883     tty->print_cr("notifying compiler thread pool to block");
1884 #endif
1885   _should_block = true;
1886 }
1887 
1888 // ------------------------------------------------------------------
1889 // CompileBroker::maybe_block
1890 //
1891 // Call this from the compiler at convenient points, to poll for _should_block.
1892 void CompileBroker::maybe_block() {
1893   if (_should_block) {
1894 #ifndef PRODUCT
1895     if (PrintCompilation && (Verbose || WizardMode))
1896       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1897 #endif
1898     ThreadInVMfromNative tivfn(JavaThread::current());
1899   }
1900 }
1901 
1902 // wrapper for CodeCache::print_summary()
1903 static void codecache_print(bool detailed)
1904 {
1905   ResourceMark rm;
1906   stringStream s;
1907   // Dump code cache  into a buffer before locking the tty,
1908   {
1909     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1910     CodeCache::print_summary(&s, detailed);
1911   }
1912   ttyLocker ttyl;
1913   tty->print("%s", s.as_string());
1914 }
1915 
1916 static void post_compilation_event(EventCompilation* event, CompileTask* task) {
1917   assert(event != NULL, "invariant");
1918   assert(event->should_commit(), "invariant");
1919   event->set_method(task->method());
1920   event->set_compileId(task->compile_id());
1921   event->set_compileLevel(task->comp_level());
1922   event->set_succeded(task->is_success());
1923   event->set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
1924   event->set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
1925   event->set_inlinedBytes(task->num_inlined_bytecodes());
1926   event->commit();
1927 }
1928 
1929 // ------------------------------------------------------------------
1930 // CompileBroker::invoke_compiler_on_method
1931 //
1932 // Compile a method.
1933 //
1934 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
1935   if (PrintCompilation) {
1936     ResourceMark rm;
1937     task->print_line();
1938   }
1939   elapsedTimer time;
1940 
1941   CompilerThread* thread = CompilerThread::current();
1942   ResourceMark rm(thread);
1943 
1944   if (LogEvents) {
1945     _compilation_log->log_compile(thread, task);
1946   }
1947 
1948   // Common flags.
1949   uint compile_id = task->compile_id();
1950   int osr_bci = task->osr_bci();
1951   bool is_osr = (osr_bci != standard_entry_bci);
1952   bool should_log = (thread->log() != NULL);
1953   bool should_break = false;
1954   int task_level = task->comp_level();
1955   {
1956     // create the handle inside it's own block so it can't
1957     // accidentally be referenced once the thread transitions to
1958     // native.  The NoHandleMark before the transition should catch
1959     // any cases where this occurs in the future.
1960     methodHandle method(thread, task->method());
1961     should_break = check_break_at(method, compile_id, is_osr);
1962     if (should_log && !CompilerOracle::should_log(method)) {
1963       should_log = false;
1964     }
1965     assert(!method->is_native(), "no longer compile natives");
1966 
1967     // Save information about this method in case of failure.
1968     set_last_compile(thread, method, is_osr, task_level);
1969 
1970     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
1971   }
1972 
1973   // Allocate a new set of JNI handles.
1974   push_jni_handle_block();
1975   Method* target_handle = task->method();
1976   int compilable = ciEnv::MethodCompilable;
1977   {
1978     int system_dictionary_modification_counter;
1979     {
1980       MutexLocker locker(Compile_lock, thread);
1981       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1982     }
1983 
1984     NoHandleMark  nhm;
1985     ThreadToNativeFromVM ttn(thread);
1986 
1987     ciEnv ci_env(task, system_dictionary_modification_counter);
1988     if (should_break) {
1989       ci_env.set_break_at_compile(true);
1990     }
1991     if (should_log) {
1992       ci_env.set_log(thread->log());
1993     }
1994     assert(thread->env() == &ci_env, "set by ci_env");
1995     // The thread-env() field is cleared in ~CompileTaskWrapper.
1996 
1997     // Cache Jvmti state
1998     ci_env.cache_jvmti_state();
1999 
2000     // Cache DTrace flags
2001     ci_env.cache_dtrace_flags();
2002 
2003     ciMethod* target = ci_env.get_method_from_handle(target_handle);
2004 
2005     TraceTime t1("compilation", &time);
2006     EventCompilation event;
2007 
2008     AbstractCompiler *comp = compiler(task_level);
2009     if (comp == NULL) {
2010       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2011     } else {
2012       comp->compile_method(&ci_env, target, osr_bci);
2013     }
2014 
2015     if (!ci_env.failing() && task->code() == NULL) {
2016       //assert(false, "compiler should always document failure");
2017       // The compiler elected, without comment, not to register a result.
2018       // Do not attempt further compilations of this method.
2019       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2020     }
2021 
2022     // Copy this bit to the enclosing block:
2023     compilable = ci_env.compilable();
2024 
2025     if (ci_env.failing()) {
2026       const char* failure_reason = ci_env.failure_reason();
2027       const char* retry_message = ci_env.retry_message();
2028       task->set_failure_reason(failure_reason);
2029       if (_compilation_log != NULL) {
2030         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);
2031       }
2032       if (PrintCompilation) {
2033         FormatBufferResource msg = retry_message != NULL ?
2034             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :
2035             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());
2036         task->print_compilation(tty, msg);
2037       }
2038 
2039       EventCompilationFailure event;
2040       if (event.should_commit()) {
2041         event.set_compileId(compile_id);
2042         event.set_failureMessage(failure_reason);
2043         event.commit();
2044       }
2045     } else {
2046       task->mark_success();
2047       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
2048       if (_compilation_log != NULL) {
2049         nmethod* code = task->code();
2050         if (code != NULL) {
2051           _compilation_log->log_nmethod(thread, code);
2052         }
2053       }
2054     }
2055     // simulate crash during compilation
2056     assert(task->compile_id() != CICrashAt, "just as planned");
2057     if (event.should_commit()) {
2058       post_compilation_event(&event, task);
2059     }
2060   }
2061   pop_jni_handle_block();
2062 
2063   methodHandle method(thread, task->method());
2064 
2065   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2066 
2067   collect_statistics(thread, time, task);
2068 
2069   if (PrintCompilation && PrintCompilation2) {
2070     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp
2071     tty->print("%4d ", compile_id);    // print compilation number
2072     tty->print("%s ", (is_osr ? "%" : " "));
2073     if (task->code() != NULL) {
2074       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2075     }
2076     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2077   }
2078 
2079   if (PrintCodeCacheOnCompilation)
2080     codecache_print(/* detailed= */ false);
2081 
2082   // Disable compilation, if required.
2083   switch (compilable) {
2084   case ciEnv::MethodCompilable_never:
2085     if (is_osr)
2086       method->set_not_osr_compilable_quietly();
2087     else
2088       method->set_not_compilable_quietly();
2089     break;
2090   case ciEnv::MethodCompilable_not_at_tier:
2091     if (is_osr)
2092       method->set_not_osr_compilable_quietly(task_level);
2093     else
2094       method->set_not_compilable_quietly(task_level);
2095     break;
2096   }
2097 
2098   // Note that the queued_for_compilation bits are cleared without
2099   // protection of a mutex. [They were set by the requester thread,
2100   // when adding the task to the compile queue -- at which time the
2101   // compile queue lock was held. Subsequently, we acquired the compile
2102   // queue lock to get this task off the compile queue; thus (to belabour
2103   // the point somewhat) our clearing of the bits must be occurring
2104   // only after the setting of the bits. See also 14012000 above.
2105   method->clear_queued_for_compilation();
2106 
2107 #ifdef ASSERT
2108   if (CollectedHeap::fired_fake_oom()) {
2109     // The current compile received a fake OOM during compilation so
2110     // go ahead and exit the VM since the test apparently succeeded
2111     tty->print_cr("*** Shutting down VM after successful fake OOM");
2112     vm_exit(0);
2113   }
2114 #endif
2115 }
2116 
2117 /**
2118  * The CodeCache is full.  Print out warning and disable compilation
2119  * or try code cache cleaning so compilation can continue later.
2120  */
2121 void CompileBroker::handle_full_code_cache() {
2122   UseInterpreter = true;
2123   if (UseCompiler || AlwaysCompileLoopMethods ) {
2124     if (xtty != NULL) {
2125       ResourceMark rm;
2126       stringStream s;
2127       // Dump code cache state into a buffer before locking the tty,
2128       // because log_state() will use locks causing lock conflicts.
2129       CodeCache::log_state(&s);
2130       // Lock to prevent tearing
2131       ttyLocker ttyl;
2132       xtty->begin_elem("code_cache_full");
2133       xtty->print("%s", s.as_string());
2134       xtty->stamp();
2135       xtty->end_elem();
2136     }
2137 
2138     CodeCache::report_codemem_full();
2139 
2140 #ifndef PRODUCT
2141     if (CompileTheWorld || ExitOnFullCodeCache) {
2142       codecache_print(/* detailed= */ true);
2143       before_exit(JavaThread::current());
2144       exit_globals(); // will delete tty
2145       vm_direct_exit(CompileTheWorld ? 0 : 1);
2146     }
2147 #endif
2148     if (UseCodeCacheFlushing) {
2149       // Since code cache is full, immediately stop new compiles
2150       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2151         NMethodSweeper::log_sweep("disable_compiler");
2152       }
2153       // Switch to 'vm_state'. This ensures that possibly_sweep() can be called
2154       // without having to consider the state in which the current thread is.
2155       ThreadInVMfromUnknown in_vm;
2156       NMethodSweeper::possibly_sweep();
2157     } else {
2158       disable_compilation_forever();
2159     }
2160 
2161     // Print warning only once
2162     if (should_print_compiler_warning()) {
2163       warning("CodeCache is full. Compiler has been disabled.");
2164       warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
2165       codecache_print(/* detailed= */ true);
2166     }
2167   }
2168 }
2169 
2170 // ------------------------------------------------------------------
2171 // CompileBroker::set_last_compile
2172 //
2173 // Record this compilation for debugging purposes.
2174 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {
2175   ResourceMark rm;
2176   char* method_name = method->name()->as_C_string();
2177   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2178   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2179   char current_method[CompilerCounters::cmname_buffer_length];
2180   size_t maxLen = CompilerCounters::cmname_buffer_length;
2181 
2182   if (UsePerfData) {
2183     const char* class_name = method->method_holder()->name()->as_C_string();
2184 
2185     size_t s1len = strlen(class_name);
2186     size_t s2len = strlen(method_name);
2187 
2188     // check if we need to truncate the string
2189     if (s1len + s2len + 2 > maxLen) {
2190 
2191       // the strategy is to lop off the leading characters of the
2192       // class name and the trailing characters of the method name.
2193 
2194       if (s2len + 2 > maxLen) {
2195         // lop of the entire class name string, let snprintf handle
2196         // truncation of the method name.
2197         class_name += s1len; // null string
2198       }
2199       else {
2200         // lop off the extra characters from the front of the class name
2201         class_name += ((s1len + s2len + 2) - maxLen);
2202       }
2203     }
2204 
2205     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2206   }
2207 
2208   if (CICountOSR && is_osr) {
2209     _last_compile_type = osr_compile;
2210   } else {
2211     _last_compile_type = normal_compile;
2212   }
2213   _last_compile_level = comp_level;
2214 
2215   if (UsePerfData) {
2216     CompilerCounters* counters = thread->counters();
2217     counters->set_current_method(current_method);
2218     counters->set_compile_type((jlong)_last_compile_type);
2219   }
2220 }
2221 
2222 
2223 // ------------------------------------------------------------------
2224 // CompileBroker::push_jni_handle_block
2225 //
2226 // Push on a new block of JNI handles.
2227 void CompileBroker::push_jni_handle_block() {
2228   JavaThread* thread = JavaThread::current();
2229 
2230   // Allocate a new block for JNI handles.
2231   // Inlined code from jni_PushLocalFrame()
2232   JNIHandleBlock* java_handles = thread->active_handles();
2233   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2234   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2235   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.
2236   thread->set_active_handles(compile_handles);
2237 }
2238 
2239 
2240 // ------------------------------------------------------------------
2241 // CompileBroker::pop_jni_handle_block
2242 //
2243 // Pop off the current block of JNI handles.
2244 void CompileBroker::pop_jni_handle_block() {
2245   JavaThread* thread = JavaThread::current();
2246 
2247   // Release our JNI handle block
2248   JNIHandleBlock* compile_handles = thread->active_handles();
2249   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2250   thread->set_active_handles(java_handles);
2251   compile_handles->set_pop_frame_link(NULL);
2252   JNIHandleBlock::release_block(compile_handles, thread); // may block
2253 }
2254 
2255 
2256 // ------------------------------------------------------------------
2257 // CompileBroker::check_break_at
2258 //
2259 // Should the compilation break at the current compilation.
2260 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {
2261   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {
2262     return true;
2263   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling
2264     return true;
2265   } else {
2266     return (compile_id == CIBreakAt);
2267   }
2268 }
2269 
2270 // ------------------------------------------------------------------
2271 // CompileBroker::collect_statistics
2272 //
2273 // Collect statistics about the compilation.
2274 
2275 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2276   bool success = task->is_success();
2277   methodHandle method (thread, task->method());
2278   uint compile_id = task->compile_id();
2279   bool is_osr = (task->osr_bci() != standard_entry_bci);
2280   nmethod* code = task->code();
2281   CompilerCounters* counters = thread->counters();
2282 
2283   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2284   MutexLocker locker(CompileStatistics_lock);
2285 
2286   // _perf variables are production performance counters which are
2287   // updated regardless of the setting of the CITime and CITimeEach flags
2288   //
2289   if (!success) {
2290     _total_bailout_count++;
2291     if (UsePerfData) {
2292       _perf_last_failed_method->set_value(counters->current_method());
2293       _perf_last_failed_type->set_value(counters->compile_type());
2294       _perf_total_bailout_count->inc();
2295     }
2296   } else if (code == NULL) {
2297     if (UsePerfData) {
2298       _perf_last_invalidated_method->set_value(counters->current_method());
2299       _perf_last_invalidated_type->set_value(counters->compile_type());
2300       _perf_total_invalidated_count->inc();
2301     }
2302     _total_invalidated_count++;
2303   } else {
2304     // Compilation succeeded
2305 
2306     // update compilation ticks - used by the implementation of
2307     // java.lang.management.CompilationMBean
2308     _perf_total_compilation->inc(time.ticks());
2309 
2310     _t_total_compilation.add(time);
2311     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2312 
2313     if (CITime) {
2314       if (is_osr) {
2315         _t_osr_compilation.add(time);
2316         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2317       } else {
2318         _t_standard_compilation.add(time);
2319         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2320       }
2321     }
2322 
2323     if (UsePerfData) {
2324       // save the name of the last method compiled
2325       _perf_last_method->set_value(counters->current_method());
2326       _perf_last_compile_type->set_value(counters->compile_type());
2327       _perf_last_compile_size->set_value(method->code_size() +
2328                                          task->num_inlined_bytecodes());
2329       if (is_osr) {
2330         _perf_osr_compilation->inc(time.ticks());
2331         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2332       } else {
2333         _perf_standard_compilation->inc(time.ticks());
2334         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2335       }
2336     }
2337 
2338     if (CITimeEach) {
2339       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2340       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2341                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2342     }
2343 
2344     // Collect counts of successful compilations
2345     _sum_nmethod_size      += code->total_size();
2346     _sum_nmethod_code_size += code->insts_size();
2347     _total_compile_count++;
2348 
2349     if (UsePerfData) {
2350       _perf_sum_nmethod_size->inc(     code->total_size());
2351       _perf_sum_nmethod_code_size->inc(code->insts_size());
2352       _perf_total_compile_count->inc();
2353     }
2354 
2355     if (is_osr) {
2356       if (UsePerfData) _perf_total_osr_compile_count->inc();
2357       _total_osr_compile_count++;
2358     } else {
2359       if (UsePerfData) _perf_total_standard_compile_count->inc();
2360       _total_standard_compile_count++;
2361     }
2362   }
2363   // set the current method for the thread to null
2364   if (UsePerfData) counters->set_current_method("");
2365 }
2366 
2367 const char* CompileBroker::compiler_name(int comp_level) {
2368   AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2369   if (comp == NULL) {
2370     return "no compiler";
2371   } else {
2372     return (comp->name());
2373   }
2374 }
2375 
2376 void CompileBroker::print_times() {
2377   tty->cr();
2378   tty->print_cr("Accumulated compiler times (for compiled methods only)");
2379   tty->print_cr("------------------------------------------------");
2380                //0000000000111111111122222222223333333333444444444455555555556666666666
2381                //0123456789012345678901234567890123456789012345678901234567890123456789
2382   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());
2383   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",
2384                 CompileBroker::_t_standard_compilation.seconds(),
2385                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);
2386   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);
2387 
2388   AbstractCompiler *comp = compiler(CompLevel_simple);
2389   if (comp != NULL) {
2390     comp->print_timers();
2391   }
2392   comp = compiler(CompLevel_full_optimization);
2393   if (comp != NULL) {
2394     comp->print_timers();
2395   }
2396   tty->cr();
2397   tty->print_cr("  Total compiled methods   : %6d methods", CompileBroker::_total_compile_count);
2398   tty->print_cr("    Standard compilation   : %6d methods", CompileBroker::_total_standard_compile_count);
2399   tty->print_cr("    On stack replacement   : %6d methods", CompileBroker::_total_osr_compile_count);
2400   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;
2401   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);
2402   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);
2403   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);
2404   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());
2405   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);
2406   tty->cr();
2407   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);
2408   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);
2409 }
2410 
2411 // Debugging output for failure
2412 void CompileBroker::print_last_compile() {
2413   if ( _last_compile_level != CompLevel_none &&
2414        compiler(_last_compile_level) != NULL &&
2415        _last_method_compiled != NULL &&
2416        _last_compile_type != no_compile) {
2417     if (_last_compile_type == osr_compile) {
2418       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",
2419                     _osr_compilation_id, _last_compile_level, _last_method_compiled);
2420     } else {
2421       tty->print_cr("Last parse:  %d+++(%d) %s",
2422                     _compilation_id, _last_compile_level, _last_method_compiled);
2423     }
2424   }
2425 }
2426 
2427 
2428 void CompileBroker::print_compiler_threads_on(outputStream* st) {
2429 #ifndef PRODUCT
2430   st->print_cr("Compiler thread printing unimplemented.");
2431   st->cr();
2432 #endif
2433 }