Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "classfile/vmSymbols.hpp"

 #include "code/codeCache.hpp"

 #include "compiler/compileBroker.hpp"

 #include "compiler/compileLog.hpp"

 #include "compiler/compilerOracle.hpp"

 #include "interpreter/linkResolver.hpp"

 #include "memory/allocation.inline.hpp"

 #include "oops/methodData.hpp"

 #include "oops/method.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/nativeLookup.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/compilationPolicy.hpp"

 #include "runtime/init.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/javaCalls.hpp"

 #include "runtime/os.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/sweeper.hpp"

 #include "trace/tracing.hpp"

 #include "utilities/dtrace.hpp"

 #include "utilities/events.hpp"

 #ifdef COMPILER1

 #include "c1/c1_Compiler.hpp"

 #endif

 #ifdef COMPILER2

 #include "opto/c2compiler.hpp"

 #endif

 #ifdef SHARK

 #include "shark/sharkCompiler.hpp"

 #endif

 #ifdef DTRACE_ENABLED

 // Only bother with this argument setup if dtrace is available

 #ifndef USDT2

 HS_DTRACE_PROBE_DECL8(hotspot, method__compile__begin,

   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t);

 HS_DTRACE_PROBE_DECL9(hotspot, method__compile__end,

   char*, intptr_t, char*, intptr_t, char*, intptr_t, char*, intptr_t, bool);

 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \

   {                                                                      \

     Symbol* klass_name = (method)->klass_name();                         \

     Symbol* name = (method)->name();                                     \

     Symbol* signature = (method)->signature();                           \

     HS_DTRACE_PROBE8(hotspot, method__compile__begin,                    \

       comp_name, strlen(comp_name),                                      \

       klass_name->bytes(), klass_name->utf8_length(),                    \

       name->bytes(), name->utf8_length(),                                \

       signature->bytes(), signature->utf8_length());                     \

   }

 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \

   {                                                                      \

     Symbol* klass_name = (method)->klass_name();                         \

     Symbol* name = (method)->name();                                     \

     Symbol* signature = (method)->signature();                           \

     HS_DTRACE_PROBE9(hotspot, method__compile__end,                      \

       comp_name, strlen(comp_name),                                      \

       klass_name->bytes(), klass_name->utf8_length(),                    \

       name->bytes(), name->utf8_length(),                                \

       signature->bytes(), signature->utf8_length(), (success));          \

   }

 #else /* USDT2 */

 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)             \

   {                                                                      \

     Symbol* klass_name = (method)->klass_name();                         \

     Symbol* name = (method)->name();                                     \

     Symbol* signature = (method)->signature();                           \

     HOTSPOT_METHOD_COMPILE_BEGIN(                                        \

       comp_name, strlen(comp_name),                                      \

       (char *) klass_name->bytes(), klass_name->utf8_length(),           \

       (char *) name->bytes(), name->utf8_length(),                       \

       (char *) signature->bytes(), signature->utf8_length());            \

   }

 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)      \

   {                                                                      \

     Symbol* klass_name = (method)->klass_name();                         \

     Symbol* name = (method)->name();                                     \

     Symbol* signature = (method)->signature();                           \

     HOTSPOT_METHOD_COMPILE_END(                                          \

       comp_name, strlen(comp_name),                                      \

       (char *) klass_name->bytes(), klass_name->utf8_length(),           \

       (char *) name->bytes(), name->utf8_length(),                       \

       (char *) signature->bytes(), signature->utf8_length(), (success)); \

   }

 #endif /* USDT2 */

 #else //  ndef DTRACE_ENABLED

 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)

 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)

 #endif // ndef DTRACE_ENABLED

 bool CompileBroker::_initialized = false;

 volatile bool CompileBroker::_should_block = false;

 volatile jint CompileBroker::_print_compilation_warning = 0;

 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;

 // The installed compiler(s)

 AbstractCompiler* CompileBroker::_compilers[2];

 // These counters are used to assign an unique ID to each compilation.

 volatile jint CompileBroker::_compilation_id     = 0;

 volatile jint CompileBroker::_osr_compilation_id = 0;

 // Debugging information

 int  CompileBroker::_last_compile_type     = no_compile;

 int  CompileBroker::_last_compile_level    = CompLevel_none;

 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];

 // Performance counters

 PerfCounter* CompileBroker::_perf_total_compilation = NULL;

 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;

 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;

 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;

 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;

 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;

 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;

 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;

 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;

 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;

 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;

 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;

 PerfStringVariable* CompileBroker::_perf_last_method = NULL;

 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;

 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;

 PerfVariable*       CompileBroker::_perf_last_compile_type = NULL;

 PerfVariable*       CompileBroker::_perf_last_compile_size = NULL;

 PerfVariable*       CompileBroker::_perf_last_failed_type = NULL;

 PerfVariable*       CompileBroker::_perf_last_invalidated_type = NULL;

 // Timers and counters for generating statistics

 elapsedTimer CompileBroker::_t_total_compilation;

 elapsedTimer CompileBroker::_t_osr_compilation;

 elapsedTimer CompileBroker::_t_standard_compilation;

 int CompileBroker::_total_bailout_count          = 0;

 int CompileBroker::_total_invalidated_count      = 0;

 int CompileBroker::_total_compile_count          = 0;

 int CompileBroker::_total_osr_compile_count      = 0;

 int CompileBroker::_total_standard_compile_count = 0;

 int CompileBroker::_sum_osr_bytes_compiled       = 0;

 int CompileBroker::_sum_standard_bytes_compiled  = 0;

 int CompileBroker::_sum_nmethod_size             = 0;

 int CompileBroker::_sum_nmethod_code_size        = 0;

 long CompileBroker::_peak_compilation_time       = 0;

 CompileQueue* CompileBroker::_c2_method_queue    = NULL;

 CompileQueue* CompileBroker::_c1_method_queue    = NULL;

 CompileTask*  CompileBroker::_task_free_list     = NULL;

 GrowableArray<CompilerThread*>* CompileBroker::_compiler_threads = NULL;

 class CompilationLog : public StringEventLog {

  public:

   CompilationLog() : StringEventLog("Compilation events") {

   }

   void log_compile(JavaThread* thread, CompileTask* task) {

     StringLogMessage lm;

     stringStream sstr = lm.stream();

     // msg.time_stamp().update_to(tty->time_stamp().ticks());

     task->print_compilation(&sstr, NULL, true);

     log(thread, "%s", (const char*)lm);

   }

   void log_nmethod(JavaThread* thread, nmethod* nm) {

     log(thread, "nmethod %d%s " INTPTR_FORMAT " code ["INTPTR_FORMAT ", " INTPTR_FORMAT "]",

         nm->compile_id(), nm->is_osr_method() ? "%" : "",

         p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));

   }

   void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {

     StringLogMessage lm;

     lm.print("%4d   COMPILE SKIPPED: %s", task->compile_id(), reason);

     if (retry_message != NULL) {

       lm.append(" (%s)", retry_message);

     }

     lm.print("\n");

     log(thread, "%s", (const char*)lm);

   }

 };

 static CompilationLog* _compilation_log = NULL;

 void compileBroker_init() {

   if (LogEvents) {

     _compilation_log = new CompilationLog();

   }

 }

 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {

   CompilerThread* thread = CompilerThread::current();

   thread->set_task(task);

   CompileLog*     log  = thread->log();

   if (log != NULL)  task->log_task_start(log);

 }

 CompileTaskWrapper::~CompileTaskWrapper() {

   CompilerThread* thread = CompilerThread::current();

   CompileTask* task = thread->task();

   CompileLog*  log  = thread->log();

   if (log != NULL)  task->log_task_done(log);

   thread->set_task(NULL);

   task->set_code_handle(NULL);

   thread->set_env(NULL);

   if (task->is_blocking()) {

     MutexLocker notifier(task->lock(), thread);

     task->mark_complete();

     // Notify the waiting thread that the compilation has completed.

     task->lock()->notify_all();

   } else {

     task->mark_complete();

     // By convention, the compiling thread is responsible for

     // recycling a non-blocking CompileTask.

     CompileBroker::free_task(task);

   }

 }

 // ------------------------------------------------------------------

 // CompileTask::initialize

 void CompileTask::initialize(int compile_id,

                              methodHandle method,

                              int osr_bci,

                              int comp_level,

                              methodHandle hot_method,

                              int hot_count,

                              const char* comment,

                              bool is_blocking) {

   assert(!_lock->is_locked(), "bad locking");

   _compile_id = compile_id;

   _method = method();

   _method_holder = JNIHandles::make_global(method->method_holder()->klass_holder());

   _osr_bci = osr_bci;

   _is_blocking = is_blocking;

   _comp_level = comp_level;

   _num_inlined_bytecodes = 0;

   _is_complete = false;

   _is_success = false;

   _code_handle = NULL;

   _hot_method = NULL;

   _hot_method_holder = NULL;

   _hot_count = hot_count;

   _time_queued = 0;  // tidy

   _comment = comment;

   _failure_reason = NULL;

   if (LogCompilation) {

     _time_queued = os::elapsed_counter();

     if (hot_method.not_null()) {

       if (hot_method == method) {

         _hot_method = _method;

       } else {

         _hot_method = hot_method();

         // only add loader or mirror if different from _method_holder

         _hot_method_holder = JNIHandles::make_global(hot_method->method_holder()->klass_holder());

       }

     }

   }

   _next = NULL;

 }

 // ------------------------------------------------------------------

 // CompileTask::code/set_code

 nmethod* CompileTask::code() const {

   if (_code_handle == NULL)  return NULL;

   return _code_handle->code();

 }

 void CompileTask::set_code(nmethod* nm) {

   if (_code_handle == NULL && nm == NULL)  return;

   guarantee(_code_handle != NULL, "");

   _code_handle->set_code(nm);

   if (nm == NULL)  _code_handle = NULL;  // drop the handle also

 }

 // ------------------------------------------------------------------

 // CompileTask::free

 void CompileTask::free() {

   set_code(NULL);

   assert(!_lock->is_locked(), "Should not be locked when freed");

   JNIHandles::destroy_global(_method_holder);

   JNIHandles::destroy_global(_hot_method_holder);

 }

 void CompileTask::mark_on_stack() {

   // Mark these methods as something redefine classes cannot remove.

   _method->set_on_stack(true);

   if (_hot_method != NULL) {

     _hot_method->set_on_stack(true);

   }

 }

 // ------------------------------------------------------------------

 // CompileTask::print

 void CompileTask::print() {

   tty->print("<CompileTask compile_id=%d ", _compile_id);

   tty->print("method=");

   _method->print_name(tty);

   tty->print_cr(" osr_bci=%d is_blocking=%s is_complete=%s is_success=%s>",

              _osr_bci, bool_to_str(_is_blocking),

              bool_to_str(_is_complete), bool_to_str(_is_success));

 }

 // ------------------------------------------------------------------

 // CompileTask::print_line_on_error

 //

 // This function is called by fatal error handler when the thread

 // causing troubles is a compiler thread.

 //

 // Do not grab any lock, do not allocate memory.

 //

 // Otherwise it's the same as CompileTask::print_line()

 //

 void CompileTask::print_line_on_error(outputStream* st, char* buf, int buflen) {

   // print compiler name

   st->print("%s:", CompileBroker::compiler_name(comp_level()));

   print_compilation(st);

 }

 // ------------------------------------------------------------------

 // CompileTask::print_line

 void CompileTask::print_line() {

   ttyLocker ttyl;  // keep the following output all in one block

   // print compiler name if requested

   if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler_name(comp_level()));

   print_compilation();

 }

 // ------------------------------------------------------------------

 // CompileTask::print_compilation_impl

 void CompileTask::print_compilation_impl(outputStream* st, Method* method, int compile_id, int comp_level,

                                          bool is_osr_method, int osr_bci, bool is_blocking,

                                          const char* msg, bool short_form) {

   if (!short_form) {

     st->print("%7d ", (int) st->time_stamp().milliseconds());  // print timestamp

   }

   st->print("%4d ", compile_id);    // print compilation number

   // For unloaded methods the transition to zombie occurs after the

   // method is cleared so it's impossible to report accurate

   // information for that case.

   bool is_synchronized = false;

   bool has_exception_handler = false;

   bool is_native = false;

   if (method != NULL) {

     is_synchronized       = method->is_synchronized();

     has_exception_handler = method->has_exception_handler();

     is_native             = method->is_native();

   }

   // method attributes

   const char compile_type   = is_osr_method                   ? '%' : ' ';

   const char sync_char      = is_synchronized                 ? 's' : ' ';

   const char exception_char = has_exception_handler           ? '!' : ' ';

   const char blocking_char  = is_blocking                     ? 'b' : ' ';

   const char native_char    = is_native                       ? 'n' : ' ';

   // print method attributes

   st->print("%c%c%c%c%c ", compile_type, sync_char, exception_char, blocking_char, native_char);

   if (TieredCompilation) {

     if (comp_level != -1)  st->print("%d ", comp_level);

     else                   st->print("- ");

   }

   st->print("     ");  // more indent

   if (method == NULL) {

     st->print("(method)");

   } else {

     method->print_short_name(st);

     if (is_osr_method) {

       st->print(" @ %d", osr_bci);

     }

     if (method->is_native())

       st->print(" (native)");

     else

       st->print(" (%d bytes)", method->code_size());

   }

   if (msg != NULL) {

     st->print("   %s", msg);

   }

   if (!short_form) {

     st->cr();

   }

 }

 // ------------------------------------------------------------------

 // CompileTask::print_inlining

 void CompileTask::print_inlining(outputStream* st, ciMethod* method, int inline_level, int bci, const char* msg) {

   //         1234567

   st->print("        ");     // print timestamp

   //         1234

   st->print("     ");        // print compilation number

   // method attributes

   if (method->is_loaded()) {

     const char sync_char      = method->is_synchronized()        ? 's' : ' ';

     const char exception_char = method->has_exception_handlers() ? '!' : ' ';

     const char monitors_char  = method->has_monitor_bytecodes()  ? 'm' : ' ';

     // print method attributes

     st->print(" %c%c%c  ", sync_char, exception_char, monitors_char);

   } else {

     //         %s!bn

     st->print("      ");     // print method attributes

   }

   if (TieredCompilation) {

     st->print("  ");

   }

   st->print("     ");        // more indent

   st->print("    ");         // initial inlining indent

   for (int i = 0; i < inline_level; i++)  st->print("  ");

   st->print("@ %d  ", bci);  // print bci

   method->print_short_name(st);

   if (method->is_loaded())

     st->print(" (%d bytes)", method->code_size());

   else

     st->print(" (not loaded)");

   if (msg != NULL) {

     st->print("   %s", msg);

   }

   st->cr();

 }

 // ------------------------------------------------------------------

 // CompileTask::print_inline_indent

 void CompileTask::print_inline_indent(int inline_level, outputStream* st) {

   //         1234567

   st->print("        ");     // print timestamp

   //         1234

   st->print("     ");        // print compilation number

   //         %s!bn

   st->print("      ");       // print method attributes

   if (TieredCompilation) {

     st->print("  ");

   }

   st->print("     ");        // more indent

   st->print("    ");         // initial inlining indent

   for (int i = 0; i < inline_level; i++)  st->print("  ");

 }

 // ------------------------------------------------------------------

 // CompileTask::print_compilation

 void CompileTask::print_compilation(outputStream* st, const char* msg, bool short_form) {

   bool is_osr_method = osr_bci() != InvocationEntryBci;

   print_compilation_impl(st, method(), compile_id(), comp_level(), is_osr_method, osr_bci(), is_blocking(), msg, short_form);

 }

 // ------------------------------------------------------------------

 // CompileTask::log_task

 void CompileTask::log_task(xmlStream* log) {

   Thread* thread = Thread::current();

   methodHandle method(thread, this->method());

   ResourceMark rm(thread);

   // <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>

   log->print(" compile_id='%d'", _compile_id);

   if (_osr_bci != CompileBroker::standard_entry_bci) {

     log->print(" compile_kind='osr'");  // same as nmethod::compile_kind

   } // else compile_kind='c2c'

   if (!method.is_null())  log->method(method);

   if (_osr_bci != CompileBroker::standard_entry_bci) {

     log->print(" osr_bci='%d'", _osr_bci);

   }

   if (_comp_level != CompLevel_highest_tier) {

     log->print(" level='%d'", _comp_level);

   }

   if (_is_blocking) {

     log->print(" blocking='1'");

   }

   log->stamp();

 }

 // ------------------------------------------------------------------

 // CompileTask::log_task_queued

 void CompileTask::log_task_queued() {

   Thread* thread = Thread::current();

   ttyLocker ttyl;

   ResourceMark rm(thread);

   xtty->begin_elem("task_queued");

   log_task(xtty);

   if (_comment != NULL) {

     xtty->print(" comment='%s'", _comment);

   }

   if (_hot_method != NULL) {

     methodHandle hot(thread, _hot_method);

     methodHandle method(thread, _method);

     if (hot() != method()) {

       xtty->method(hot);

     }

   }

   if (_hot_count != 0) {

     xtty->print(" hot_count='%d'", _hot_count);

   }

   xtty->end_elem();

 }

 // ------------------------------------------------------------------

 // CompileTask::log_task_start

 void CompileTask::log_task_start(CompileLog* log)   {

   log->begin_head("task");

   log_task(log);

   log->end_head();

 }

 // ------------------------------------------------------------------

 // CompileTask::log_task_done

 void CompileTask::log_task_done(CompileLog* log) {

   Thread* thread = Thread::current();

   methodHandle method(thread, this->method());

   ResourceMark rm(thread);

   if (!_is_success) {

     const char* reason = _failure_reason != NULL ? _failure_reason : "unknown";

     log->elem("failure reason='%s'", reason);

   }

   // <task_done ... stamp='1.234'>  </task>

   nmethod* nm = code();

   log->begin_elem("task_done success='%d' nmsize='%d' count='%d'",

                   _is_success, nm == NULL ? 0 : nm->content_size(),

                   method->invocation_count());

   int bec = method->backedge_count();

   if (bec != 0)  log->print(" backedge_count='%d'", bec);

   // Note:  "_is_complete" is about to be set, but is not.

   if (_num_inlined_bytecodes != 0) {

     log->print(" inlined_bytes='%d'", _num_inlined_bytecodes);

   }

   log->stamp();

   log->end_elem();

   log->tail("task");

   log->clear_identities();   // next task will have different CI

   if (log->unflushed_count() > 2000) {

     log->flush();

   }

   log->mark_file_end();

 }

 // Add a CompileTask to a CompileQueue

 void CompileQueue::add(CompileTask* task) {

   assert(lock()->owned_by_self(), "must own lock");

   task->set_next(NULL);

   task->set_prev(NULL);

   if (_last == NULL) {

     // The compile queue is empty.

     assert(_first == NULL, "queue is empty");

     _first = task;

     _last = task;

   } else {

     // Append the task to the queue.

     assert(_last->next() == NULL, "not last");

     _last->set_next(task);

     task->set_prev(_last);

     _last = task;

   }

   ++_size;

   // Mark the method as being in the compile queue.

   task->method()->set_queued_for_compilation();

   if (CIPrintCompileQueue) {

     print();

   }

   if (LogCompilation && xtty != NULL) {

     task->log_task_queued();

   }

   // Notify CompilerThreads that a task is available.

   lock()->notify_all();

 }

 void CompileQueue::delete_all() {

   assert(lock()->owned_by_self(), "must own lock");

   if (_first != NULL) {

     for (CompileTask* task = _first; task != NULL; task = task->next()) {

       delete task;

     }

     _first = NULL;

   }

 }

 // ------------------------------------------------------------------

 // CompileQueue::get

 //

 // Get the next CompileTask from a CompileQueue

 CompileTask* CompileQueue::get() {

   NMethodSweeper::possibly_sweep();

   MutexLocker locker(lock());

   // If _first is NULL we have no more compile jobs. There are two reasons for

   // having no compile jobs: First, we compiled everything we wanted. Second,

   // we ran out of code cache so compilation has been disabled. In the latter

   // case we perform code cache sweeps to free memory such that we can re-enable

   // compilation.

   while (_first == NULL) {

     // Exit loop if compilation is disabled forever

     if (CompileBroker::is_compilation_disabled_forever()) {

       return NULL;

     }

     if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs()) {

       // Wait a certain amount of time to possibly do another sweep.

       // We must wait until stack scanning has happened so that we can

       // transition a method's state from 'not_entrant' to 'zombie'.

       long wait_time = NmethodSweepCheckInterval * 1000;

       if (FLAG_IS_DEFAULT(NmethodSweepCheckInterval)) {

         // Only one thread at a time can do sweeping. Scale the

         // wait time according to the number of compiler threads.

         // As a result, the next sweep is likely to happen every 100ms

         // with an arbitrary number of threads that do sweeping.

         wait_time = 100 * CICompilerCount;

       }

       bool timeout = lock()->wait(!Mutex::_no_safepoint_check_flag, wait_time);

       if (timeout) {

         MutexUnlocker ul(lock());

         NMethodSweeper::possibly_sweep();

       }

     } else {

       // If there are no compilation tasks and we can compile new jobs

       // (i.e., there is enough free space in the code cache) there is

       // no need to invoke the sweeper. As a result, the hotness of methods

       // remains unchanged. This behavior is desired, since we want to keep

       // the stable state, i.e., we do not want to evict methods from the

       // code cache if it is unnecessary.

       // We need a timed wait here, since compiler threads can exit if compilation

       // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads

       // is not critical and we do not want idle compiler threads to wake up too often.

       lock()->wait(!Mutex::_no_safepoint_check_flag, 5*1000);

     }

   }

   if (CompileBroker::is_compilation_disabled_forever()) {

     return NULL;

   }

   CompileTask* task;

   {

     No_Safepoint_Verifier nsv;

     task = CompilationPolicy::policy()->select_task(this);

   }

   remove(task);

   purge_stale_tasks(); // may temporarily release MCQ lock

   return task;

 }

 // Clean & deallocate stale compile tasks.

 // Temporarily releases MethodCompileQueue lock.

 void CompileQueue::purge_stale_tasks() {

   assert(lock()->owned_by_self(), "must own lock");

   if (_first_stale != NULL) {

     // Stale tasks are purged when MCQ lock is released,

     // but _first_stale updates are protected by MCQ lock.

     // Once task processing starts and MCQ lock is released,

     // other compiler threads can reuse _first_stale.

     CompileTask* head = _first_stale;

     _first_stale = NULL;

     {

       MutexUnlocker ul(lock());

       for (CompileTask* task = head; task != NULL; ) {

         CompileTask* next_task = task->next();

         CompileTaskWrapper ctw(task); // Frees the task

         task->set_failure_reason("stale task");

         task = next_task;

       }

     }

   }

 }

 void CompileQueue::remove(CompileTask* task) {

    assert(lock()->owned_by_self(), "must own lock");

   if (task->prev() != NULL) {

     task->prev()->set_next(task->next());

   } else {

     // max is the first element

     assert(task == _first, "Sanity");

     _first = task->next();

   }

   if (task->next() != NULL) {

     task->next()->set_prev(task->prev());

   } else {

     // max is the last element

     assert(task == _last, "Sanity");

     _last = task->prev();

   }

   --_size;

 }

 void CompileQueue::remove_and_mark_stale(CompileTask* task) {

   assert(lock()->owned_by_self(), "must own lock");

   remove(task);

   // Enqueue the task for reclamation (should be done outside MCQ lock)

   task->set_next(_first_stale);

   task->set_prev(NULL);

   _first_stale = task;

 }

 // methods in the compile queue need to be marked as used on the stack

 // so that they don't get reclaimed by Redefine Classes

 void CompileQueue::mark_on_stack() {

   CompileTask* task = _first;

   while (task != NULL) {

     task->mark_on_stack();

     task = task->next();

   }

 }

 // ------------------------------------------------------------------

 // CompileQueue::print

 void CompileQueue::print() {

   tty->print_cr("Contents of %s", name());

   tty->print_cr("----------------------");

   CompileTask* task = _first;

   while (task != NULL) {

     task->print_line();

     task = task->next();

   }

   tty->print_cr("----------------------");

 }

 CompilerCounters::CompilerCounters(const char* thread_name, int instance, TRAPS) {

   _current_method[0] = '\0';

   _compile_type = CompileBroker::no_compile;

   if (UsePerfData) {

     ResourceMark rm;

     // create the thread instance name space string - don't create an

     // instance subspace if instance is -1 - keeps the adapterThread

     // counters  from having a ".0" namespace.

     const char* thread_i = (instance == -1) ? thread_name :

                       PerfDataManager::name_space(thread_name, instance);

     char* name = PerfDataManager::counter_name(thread_i, "method");

     _perf_current_method =

                PerfDataManager::create_string_variable(SUN_CI, name,

                                                        cmname_buffer_length,

                                                        _current_method, CHECK);

     name = PerfDataManager::counter_name(thread_i, "type");

     _perf_compile_type = PerfDataManager::create_variable(SUN_CI, name,

                                                           PerfData::U_None,

                                                          (jlong)_compile_type,

                                                           CHECK);

     name = PerfDataManager::counter_name(thread_i, "time");

     _perf_time = PerfDataManager::create_counter(SUN_CI, name,

                                                  PerfData::U_Ticks, CHECK);

     name = PerfDataManager::counter_name(thread_i, "compiles");

     _perf_compiles = PerfDataManager::create_counter(SUN_CI, name,

                                                      PerfData::U_Events, CHECK);

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::compilation_init

 //

 // Initialize the Compilation object

 void CompileBroker::compilation_init() {

   _last_method_compiled[0] = '\0';

   // No need to initialize compilation system if we do not use it.

   if (!UseCompiler) {

     return;

   }

 #ifndef SHARK

   // Set the interface to the current compiler(s).

   int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);

   int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);

 #ifdef COMPILER1

   if (c1_count > 0) {

     _compilers[0] = new Compiler();

   }

 #endif // COMPILER1

 #ifdef COMPILER2

   if (c2_count > 0) {

     _compilers[1] = new C2Compiler();

   }

 #endif // COMPILER2

 #else // SHARK

   int c1_count = 0;

   int c2_count = 1;

   _compilers[1] = new SharkCompiler();

 #endif // SHARK

   // Initialize the CompileTask free list

   _task_free_list = NULL;

   // Start the CompilerThreads

   init_compiler_threads(c1_count, c2_count);

   // totalTime performance counter is always created as it is required

   // by the implementation of java.lang.management.CompilationMBean.

   {

     EXCEPTION_MARK;

     _perf_total_compilation =

                  PerfDataManager::create_counter(JAVA_CI, "totalTime",

                                                  PerfData::U_Ticks, CHECK);

   }

   if (UsePerfData) {

     EXCEPTION_MARK;

     // create the jvmstat performance counters

     _perf_osr_compilation =

                  PerfDataManager::create_counter(SUN_CI, "osrTime",

                                                  PerfData::U_Ticks, CHECK);

     _perf_standard_compilation =

                  PerfDataManager::create_counter(SUN_CI, "standardTime",

                                                  PerfData::U_Ticks, CHECK);

     _perf_total_bailout_count =

                  PerfDataManager::create_counter(SUN_CI, "totalBailouts",

                                                  PerfData::U_Events, CHECK);

     _perf_total_invalidated_count =

                  PerfDataManager::create_counter(SUN_CI, "totalInvalidates",

                                                  PerfData::U_Events, CHECK);

     _perf_total_compile_count =

                  PerfDataManager::create_counter(SUN_CI, "totalCompiles",

                                                  PerfData::U_Events, CHECK);

     _perf_total_osr_compile_count =

                  PerfDataManager::create_counter(SUN_CI, "osrCompiles",

                                                  PerfData::U_Events, CHECK);

     _perf_total_standard_compile_count =

                  PerfDataManager::create_counter(SUN_CI, "standardCompiles",

                                                  PerfData::U_Events, CHECK);

     _perf_sum_osr_bytes_compiled =

                  PerfDataManager::create_counter(SUN_CI, "osrBytes",

                                                  PerfData::U_Bytes, CHECK);

     _perf_sum_standard_bytes_compiled =

                  PerfDataManager::create_counter(SUN_CI, "standardBytes",

                                                  PerfData::U_Bytes, CHECK);

     _perf_sum_nmethod_size =

                  PerfDataManager::create_counter(SUN_CI, "nmethodSize",

                                                  PerfData::U_Bytes, CHECK);

     _perf_sum_nmethod_code_size =

                  PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",

                                                  PerfData::U_Bytes, CHECK);

     _perf_last_method =

                  PerfDataManager::create_string_variable(SUN_CI, "lastMethod",

                                        CompilerCounters::cmname_buffer_length,

                                        "", CHECK);

     _perf_last_failed_method =

             PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",

                                        CompilerCounters::cmname_buffer_length,

                                        "", CHECK);

     _perf_last_invalidated_method =

         PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",

                                      CompilerCounters::cmname_buffer_length,

                                      "", CHECK);

     _perf_last_compile_type =

              PerfDataManager::create_variable(SUN_CI, "lastType",

                                               PerfData::U_None,

                                               (jlong)CompileBroker::no_compile,

                                               CHECK);

     _perf_last_compile_size =

              PerfDataManager::create_variable(SUN_CI, "lastSize",

                                               PerfData::U_Bytes,

                                               (jlong)CompileBroker::no_compile,

                                               CHECK);

     _perf_last_failed_type =

              PerfDataManager::create_variable(SUN_CI, "lastFailedType",

                                               PerfData::U_None,

                                               (jlong)CompileBroker::no_compile,

                                               CHECK);

     _perf_last_invalidated_type =

          PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",

                                           PerfData::U_None,

                                           (jlong)CompileBroker::no_compile,

                                           CHECK);

   }

   _initialized = true;

 }

 CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters,

                                                     AbstractCompiler* comp, TRAPS) {

   CompilerThread* compiler_thread = NULL;

   Klass* k =

     SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(),

                                       true, CHECK_0);

   instanceKlassHandle klass (THREAD, k);

   instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_0);

   Handle string = java_lang_String::create_from_str(name, CHECK_0);

   // Initialize thread_oop to put it into the system threadGroup

   Handle thread_group (THREAD,  Universe::system_thread_group());

   JavaValue result(T_VOID);

   JavaCalls::call_special(&result, thread_oop,

                        klass,

                        vmSymbols::object_initializer_name(),

                        vmSymbols::threadgroup_string_void_signature(),

                        thread_group,

                        string,

                        CHECK_0);

   {

     MutexLocker mu(Threads_lock, THREAD);

     compiler_thread = new CompilerThread(queue, counters);

     // At this point the new CompilerThread data-races with this startup

     // thread (which I believe is the primoridal thread and NOT the VM

     // thread).  This means Java bytecodes being executed at startup can

     // queue compile jobs which will run at whatever default priority the

     // newly created CompilerThread runs at.

     // At this point it may be possible that no osthread was created for the

     // JavaThread due to lack of memory. We would have to throw an exception

     // in that case. However, since this must work and we do not allow

     // exceptions anyway, check and abort if this fails.

     if (compiler_thread == NULL || compiler_thread->osthread() == NULL){

       vm_exit_during_initialization("java.lang.OutOfMemoryError",

                                     "unable to create new native thread");

     }

     java_lang_Thread::set_thread(thread_oop(), compiler_thread);

     // Note that this only sets the JavaThread _priority field, which by

     // definition is limited to Java priorities and not OS priorities.

     // The os-priority is set in the CompilerThread startup code itself

     java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);

     // Note that we cannot call os::set_priority because it expects Java

     // priorities and we are *explicitly* using OS priorities so that it's

     // possible to set the compiler thread priority higher than any Java

     // thread.

     int native_prio = CompilerThreadPriority;

     if (native_prio == -1) {

       if (UseCriticalCompilerThreadPriority) {

         native_prio = os::java_to_os_priority[CriticalPriority];

       } else {

         native_prio = os::java_to_os_priority[NearMaxPriority];

       }

     }

     os::set_native_priority(compiler_thread, native_prio);

     java_lang_Thread::set_daemon(thread_oop());

     compiler_thread->set_threadObj(thread_oop());

     compiler_thread->set_compiler(comp);

     Threads::add(compiler_thread);

     Thread::start(compiler_thread);

   }

   // Let go of Threads_lock before yielding

   os::yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)

   return compiler_thread;

 }

 void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {

   EXCEPTION_MARK;

 #if !defined(ZERO) && !defined(SHARK)

   assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");

 #endif // !ZERO && !SHARK

   // Initialize the compilation queue

   if (c2_compiler_count > 0) {

     _c2_method_queue  = new CompileQueue("C2MethodQueue",  MethodCompileQueue_lock);

     _compilers[1]->set_num_compiler_threads(c2_compiler_count);

   }

   if (c1_compiler_count > 0) {

     _c1_method_queue  = new CompileQueue("C1MethodQueue",  MethodCompileQueue_lock);

     _compilers[0]->set_num_compiler_threads(c1_compiler_count);

   }

   int compiler_count = c1_compiler_count + c2_compiler_count;

   _compiler_threads =

     new (ResourceObj::C_HEAP, mtCompiler) GrowableArray<CompilerThread*>(compiler_count, true);

   char name_buffer[256];

   for (int i = 0; i < c2_compiler_count; i++) {

     // Create a name for our thread.

     sprintf(name_buffer, "C2 CompilerThread%d", i);

     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);

     // Shark and C2

     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, _compilers[1], CHECK);

     _compiler_threads->append(new_thread);

   }

   for (int i = c2_compiler_count; i < compiler_count; i++) {

     // Create a name for our thread.

     sprintf(name_buffer, "C1 CompilerThread%d", i);

     CompilerCounters* counters = new CompilerCounters("compilerThread", i, CHECK);

     // C1

     CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, _compilers[0], CHECK);

     _compiler_threads->append(new_thread);

   }

   if (UsePerfData) {

     PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, compiler_count, CHECK);

   }

 }

 // Set the methods on the stack as on_stack so that redefine classes doesn't

 // reclaim them

 void CompileBroker::mark_on_stack() {

   if (_c2_method_queue != NULL) {

     _c2_method_queue->mark_on_stack();

   }

   if (_c1_method_queue != NULL) {

     _c1_method_queue->mark_on_stack();

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::compile_method

 //

 // Request compilation of a method.

 void CompileBroker::compile_method_base(methodHandle method,

                                         int osr_bci,

                                         int comp_level,

                                         methodHandle hot_method,

                                         int hot_count,

                                         const char* comment,

                                         Thread* thread) {

   // do nothing if compiler thread(s) is not available

   if (!_initialized ) {

     return;

   }

   guarantee(!method->is_abstract(), "cannot compile abstract methods");

   assert(method->method_holder()->oop_is_instance(),

          "sanity check");

   assert(!method->method_holder()->is_not_initialized(),

          "method holder must be initialized");

   assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");

   if (CIPrintRequests) {

     tty->print("request: ");

     method->print_short_name(tty);

     if (osr_bci != InvocationEntryBci) {

       tty->print(" osr_bci: %d", osr_bci);

     }

     tty->print(" comment: %s count: %d", comment, hot_count);

     if (!hot_method.is_null()) {

       tty->print(" hot: ");

       if (hot_method() != method()) {

           hot_method->print_short_name(tty);

       } else {

         tty->print("yes");

       }

     }

     tty->cr();

   }

   // A request has been made for compilation.  Before we do any

   // real work, check to see if the method has been compiled

   // in the meantime with a definitive result.

   if (compilation_is_complete(method, osr_bci, comp_level)) {

     return;

   }

 #ifndef PRODUCT

   if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {

     if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {

       // Positive OSROnlyBCI means only compile that bci.  Negative means don't compile that BCI.

       return;

     }

   }

 #endif

   // If this method is already in the compile queue, then

   // we do not block the current thread.

   if (compilation_is_in_queue(method, osr_bci)) {

     // We may want to decay our counter a bit here to prevent

     // multiple denied requests for compilation.  This is an

     // open compilation policy issue. Note: The other possibility,

     // in the case that this is a blocking compile request, is to have

     // all subsequent blocking requesters wait for completion of

     // ongoing compiles. Note that in this case we'll need a protocol

     // for freeing the associated compile tasks. [Or we could have

     // a single static monitor on which all these waiters sleep.]

     return;

   }

   // If the requesting thread is holding the pending list lock

   // then we just return. We can't risk blocking while holding

   // the pending list lock or a 3-way deadlock may occur

   // between the reference handler thread, a GC (instigated

   // by a compiler thread), and compiled method registration.

   if (InstanceRefKlass::owns_pending_list_lock(JavaThread::current())) {

     return;

   }

   if (TieredCompilation) {

     // Tiered policy requires MethodCounters to exist before adding a method to

     // the queue. Create if we don't have them yet.

     method->get_method_counters(thread);

   }

   // Outputs from the following MutexLocker block:

   CompileTask* task     = NULL;

   bool         blocking = false;

   CompileQueue* queue  = compile_queue(comp_level);

   // Acquire our lock.

   {

     MutexLocker locker(queue->lock(), thread);

     // Make sure the method has not slipped into the queues since

     // last we checked; note that those checks were "fast bail-outs".

     // Here we need to be more careful, see 14012000 below.

     if (compilation_is_in_queue(method, osr_bci)) {

       return;

     }

     // We need to check again to see if the compilation has

     // completed.  A previous compilation may have registered

     // some result.

     if (compilation_is_complete(method, osr_bci, comp_level)) {

       return;

     }

     // We now know that this compilation is not pending, complete,

     // or prohibited.  Assign a compile_id to this compilation

     // and check to see if it is in our [Start..Stop) range.

     int compile_id = assign_compile_id(method, osr_bci);

     if (compile_id == 0) {

       // The compilation falls outside the allowed range.

       return;

     }

     // Should this thread wait for completion of the compile?

     blocking = is_compile_blocking(method, osr_bci);

     // We will enter the compilation in the queue.

     // 14012000: Note that this sets the queued_for_compile bits in

     // the target method. We can now reason that a method cannot be

     // queued for compilation more than once, as follows:

     // Before a thread queues a task for compilation, it first acquires

     // the compile queue lock, then checks if the method's queued bits

     // are set or it has already been compiled. Thus there can not be two

     // instances of a compilation task for the same method on the

     // compilation queue. Consider now the case where the compilation

     // thread has already removed a task for that method from the queue

     // and is in the midst of compiling it. In this case, the

     // queued_for_compile bits must be set in the method (and these

     // will be visible to the current thread, since the bits were set

     // under protection of the compile queue lock, which we hold now.

     // When the compilation completes, the compiler thread first sets

     // the compilation result and then clears the queued_for_compile

     // bits. Neither of these actions are protected by a barrier (or done

     // under the protection of a lock), so the only guarantee we have

     // (on machines with TSO (Total Store Order)) is that these values

     // will update in that order. As a result, the only combinations of

     // these bits that the current thread will see are, in temporal order:

     // <RESULT, QUEUE> :

     //     <0, 1> : in compile queue, but not yet compiled

     //     <1, 1> : compiled but queue bit not cleared

     //     <1, 0> : compiled and queue bit cleared

     // Because we first check the queue bits then check the result bits,

     // we are assured that we cannot introduce a duplicate task.

     // Note that if we did the tests in the reverse order (i.e. check

     // result then check queued bit), we could get the result bit before

     // the compilation completed, and the queue bit after the compilation

     // completed, and end up introducing a "duplicate" (redundant) task.

     // In that case, the compiler thread should first check if a method

     // has already been compiled before trying to compile it.

     // NOTE: in the event that there are multiple compiler threads and

     // there is de-optimization/recompilation, things will get hairy,

     // and in that case it's best to protect both the testing (here) of

     // these bits, and their updating (here and elsewhere) under a

     // common lock.

     task = create_compile_task(queue,

                                compile_id, method,

                                osr_bci, comp_level,

                                hot_method, hot_count, comment,

                                blocking);

   }

   if (blocking) {

     wait_for_completion(task);

   }

 }

 nmethod* CompileBroker::compile_method(methodHandle method, int osr_bci,

                                        int comp_level,

                                        methodHandle hot_method, int hot_count,

                                        const char* comment, Thread* THREAD) {

   // make sure arguments make sense

   assert(method->method_holder()->oop_is_instance(), "not an instance method");

   assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");

   assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");

   assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");

   // allow any levels for WhiteBox

   assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");

   // return quickly if possible

   // lock, make sure that the compilation

   // isn't prohibited in a straightforward way.

   AbstractCompiler *comp = CompileBroker::compiler(comp_level);

   if (comp == NULL || !comp->can_compile_method(method) ||

       compilation_is_prohibited(method, osr_bci, comp_level)) {

     return NULL;

   }

   if (osr_bci == InvocationEntryBci) {

     // standard compilation

     nmethod* method_code = method->code();

     if (method_code != NULL) {

       if (compilation_is_complete(method, osr_bci, comp_level)) {

         return method_code;

       }

     }

     if (method->is_not_compilable(comp_level)) {

       return NULL;

     }

   } else {

     // osr compilation

 #ifndef TIERED

     // seems like an assert of dubious value

     assert(comp_level == CompLevel_highest_tier,

            "all OSR compiles are assumed to be at a single compilation lavel");

 #endif // TIERED

     // We accept a higher level osr method

     nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);

     if (nm != NULL) return nm;

     if (method->is_not_osr_compilable(comp_level)) return NULL;

   }

   assert(!HAS_PENDING_EXCEPTION, "No exception should be present");

   // some prerequisites that are compiler specific

   if (comp->is_c2() || comp->is_shark()) {

     method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);

     // Resolve all classes seen in the signature of the method

     // we are compiling.

     Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);

   }

   // If the method is native, do the lookup in the thread requesting

   // the compilation. Native lookups can load code, which is not

   // permitted during compilation.

   //

   // Note: A native method implies non-osr compilation which is

   //       checked with an assertion at the entry of this method.

   if (method->is_native() && !method->is_method_handle_intrinsic()) {

     bool in_base_library;

     address adr = NativeLookup::lookup(method, in_base_library, THREAD);

     if (HAS_PENDING_EXCEPTION) {

       // In case of an exception looking up the method, we just forget

       // about it. The interpreter will kick-in and throw the exception.

       method->set_not_compilable(); // implies is_not_osr_compilable()

       CLEAR_PENDING_EXCEPTION;

       return NULL;

     }

     assert(method->has_native_function(), "must have native code by now");

   }

   // RedefineClasses() has replaced this method; just return

   if (method->is_old()) {

     return NULL;

   }

   // JVMTI -- post_compile_event requires jmethod_id() that may require

   // a lock the compiling thread can not acquire. Prefetch it here.

   if (JvmtiExport::should_post_compiled_method_load()) {

     method->jmethod_id();

   }

   // do the compilation

   if (method->is_native()) {

     if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {

       // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that

       // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).

       //

       // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter

       // in this case.  If we can't generate one and use it we can not execute the out-of-line method handle calls.

       AdapterHandlerLibrary::create_native_wrapper(method);

     } else {

       return NULL;

     }

   } else {

     // If the compiler is shut off due to code cache getting full

     // fail out now so blocking compiles dont hang the java thread

     if (!should_compile_new_jobs()) {

       CompilationPolicy::policy()->delay_compilation(method());

       return NULL;

     }

     compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, THREAD);

   }

   // return requested nmethod

   // We accept a higher level osr method

   return osr_bci  == InvocationEntryBci ? method->code() : method->lookup_osr_nmethod_for(osr_bci, comp_level, false);

 }

 // ------------------------------------------------------------------

 // CompileBroker::compilation_is_complete

 //

 // See if compilation of this method is already complete.

 bool CompileBroker::compilation_is_complete(methodHandle method,

                                             int          osr_bci,

                                             int          comp_level) {

   bool is_osr = (osr_bci != standard_entry_bci);

   if (is_osr) {

     if (method->is_not_osr_compilable(comp_level)) {

       return true;

     } else {

       nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);

       return (result != NULL);

     }

   } else {

     if (method->is_not_compilable(comp_level)) {

       return true;

     } else {

       nmethod* result = method->code();

       if (result == NULL) return false;

       return comp_level == result->comp_level();

     }

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::compilation_is_in_queue

 //

 // See if this compilation is already requested.

 //

 // Implementation note: there is only a single "is in queue" bit

 // for each method.  This means that the check below is overly

 // conservative in the sense that an osr compilation in the queue

 // will block a normal compilation from entering the queue (and vice

 // versa).  This can be remedied by a full queue search to disambiguate

 // cases.  If it is deemed profitible, this may be done.

 bool CompileBroker::compilation_is_in_queue(methodHandle method,

                                             int          osr_bci) {

   return method->queued_for_compilation();

 }

 // ------------------------------------------------------------------

 // CompileBroker::compilation_is_prohibited

 //

 // See if this compilation is not allowed.

 bool CompileBroker::compilation_is_prohibited(methodHandle method, int osr_bci, int comp_level) {

   bool is_native = method->is_native();

   // Some compilers may not support the compilation of natives.

   AbstractCompiler *comp = compiler(comp_level);

   if (is_native &&

       (!CICompileNatives || comp == NULL || !comp->supports_native())) {

     method->set_not_compilable_quietly(comp_level);

     return true;

   }

   bool is_osr = (osr_bci != standard_entry_bci);

   // Some compilers may not support on stack replacement.

   if (is_osr &&

       (!CICompileOSR || comp == NULL || !comp->supports_osr())) {

     method->set_not_osr_compilable(comp_level);

     return true;

   }

   // The method may be explicitly excluded by the user.

   bool quietly;

   if (CompilerOracle::should_exclude(method, quietly)) {

     if (!quietly) {

       // This does not happen quietly...

       ResourceMark rm;

       tty->print("### Excluding %s:%s",

                  method->is_native() ? "generation of native wrapper" : "compile",

                  (method->is_static() ? " static" : ""));

       method->print_short_name(tty);

       tty->cr();

     }

     method->set_not_compilable(CompLevel_all, !quietly, "excluded by CompilerOracle");

   }

   return false;

 }

 /**

  * Generate serialized IDs for compilation requests. If certain debugging flags are used

  * and the ID is not within the specified range, the method is not compiled and 0 is returned.

  * The function also allows to generate separate compilation IDs for OSR compilations.

  */

 int CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {

 #ifdef ASSERT

   bool is_osr = (osr_bci != standard_entry_bci);

   int id;

   if (method->is_native()) {

     assert(!is_osr, "can't be osr");

     // Adapters, native wrappers and method handle intrinsics

     // should be generated always.

     return Atomic::add(1, &_compilation_id);

   } else if (CICountOSR && is_osr) {

     id = Atomic::add(1, &_osr_compilation_id);

     if (CIStartOSR <= id && id < CIStopOSR) {

       return id;

     }

   } else {

     id = Atomic::add(1, &_compilation_id);

     if (CIStart <= id && id < CIStop) {

       return id;

     }

   }

   // Method was not in the appropriate compilation range.

   method->set_not_compilable_quietly();

   return 0;

 #else

   // CICountOSR is a develop flag and set to 'false' by default. In a product built,

   // only _compilation_id is incremented.

   return Atomic::add(1, &_compilation_id);

 #endif

 }

 // ------------------------------------------------------------------

 // CompileBroker::is_compile_blocking

 //

 // Should the current thread be blocked until this compilation request

 // has been fulfilled?

 bool CompileBroker::is_compile_blocking(methodHandle method, int osr_bci) {

   assert(!InstanceRefKlass::owns_pending_list_lock(JavaThread::current()), "possible deadlock");

   return !BackgroundCompilation;

 }

 // ------------------------------------------------------------------

 // CompileBroker::preload_classes

 void CompileBroker::preload_classes(methodHandle method, TRAPS) {

   // Move this code over from c1_Compiler.cpp

   ShouldNotReachHere();

 }

 // ------------------------------------------------------------------

 // CompileBroker::create_compile_task

 //

 // Create a CompileTask object representing the current request for

 // compilation.  Add this task to the queue.

 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,

                                               int           compile_id,

                                               methodHandle  method,

                                               int           osr_bci,

                                               int           comp_level,

                                               methodHandle  hot_method,

                                               int           hot_count,

                                               const char*   comment,

                                               bool          blocking) {

   CompileTask* new_task = allocate_task();

   new_task->initialize(compile_id, method, osr_bci, comp_level,

                        hot_method, hot_count, comment,

                        blocking);

   queue->add(new_task);

   return new_task;

 }

 // ------------------------------------------------------------------

 // CompileBroker::allocate_task

 //

 // Allocate a CompileTask, from the free list if possible.

 CompileTask* CompileBroker::allocate_task() {

   MutexLocker locker(CompileTaskAlloc_lock);

   CompileTask* task = NULL;

   if (_task_free_list != NULL) {

     task = _task_free_list;

     _task_free_list = task->next();

     task->set_next(NULL);

   } else {

     task = new CompileTask();

     task->set_next(NULL);

   }

   return task;

 }

 // ------------------------------------------------------------------

 // CompileBroker::free_task

 //

 // Add a task to the free list.

 void CompileBroker::free_task(CompileTask* task) {

   MutexLocker locker(CompileTaskAlloc_lock);

   task->free();

   task->set_next(_task_free_list);

   _task_free_list = task;

 }

 // ------------------------------------------------------------------

 // CompileBroker::wait_for_completion

 //

 // Wait for the given method CompileTask to complete.

 void CompileBroker::wait_for_completion(CompileTask* task) {

   if (CIPrintCompileQueue) {

     tty->print_cr("BLOCKING FOR COMPILE");

   }

   assert(task->is_blocking(), "can only wait on blocking task");

   JavaThread *thread = JavaThread::current();

   thread->set_blocked_on_compilation(true);

   methodHandle method(thread, task->method());

   {

     MutexLocker waiter(task->lock(), thread);

     while (!task->is_complete())

       task->lock()->wait();

   }

   // It is harmless to check this status without the lock, because

   // completion is a stable property (until the task object is recycled).

   assert(task->is_complete(), "Compilation should have completed");

   assert(task->code_handle() == NULL, "must be reset");

   thread->set_blocked_on_compilation(false);

   // By convention, the waiter is responsible for recycling a

   // blocking CompileTask. Since there is only one waiter ever

   // waiting on a CompileTask, we know that no one else will

   // be using this CompileTask; we can free it.

   free_task(task);

 }

 // Initialize compiler thread(s) + compiler object(s). The postcondition

 // of this function is that the compiler runtimes are initialized and that

 //compiler threads can start compiling.

 bool CompileBroker::init_compiler_runtime() {

   CompilerThread* thread = CompilerThread::current();

   AbstractCompiler* comp = thread->compiler();

   // Final sanity check - the compiler object must exist

   guarantee(comp != NULL, "Compiler object must exist");

   int system_dictionary_modification_counter;

   {

     MutexLocker locker(Compile_lock, thread);

     system_dictionary_modification_counter = SystemDictionary::number_of_modifications();

   }

   {

     // Must switch to native to allocate ci_env

     ThreadToNativeFromVM ttn(thread);

     ciEnv ci_env(NULL, system_dictionary_modification_counter);

     // Cache Jvmti state

     ci_env.cache_jvmti_state();

     // Cache DTrace flags

     ci_env.cache_dtrace_flags();

     // Switch back to VM state to do compiler initialization

     ThreadInVMfromNative tv(thread);

     ResetNoHandleMark rnhm;

     if (!comp->is_shark()) {

       // Perform per-thread and global initializations

       comp->initialize();

     }

   }

   if (comp->is_failed()) {

     disable_compilation_forever();

     // If compiler initialization failed, no compiler thread that is specific to a

     // particular compiler runtime will ever start to compile methods.

     shutdown_compiler_runtime(comp, thread);

     return false;

   }

   // C1 specific check

   if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {

     warning("Initialization of %s thread failed (no space to run compilers)", thread->name());

     return false;

   }

   return true;

 }

 // If C1 and/or C2 initialization failed, we shut down all compilation.

 // We do this to keep things simple. This can be changed if it ever turns out to be

 // a problem.

 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {

   // Free buffer blob, if allocated

   if (thread->get_buffer_blob() != NULL) {

     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

     CodeCache::free(thread->get_buffer_blob());

   }

   if (comp->should_perform_shutdown()) {

     // There are two reasons for shutting down the compiler

     // 1) compiler runtime initialization failed

     // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing

     warning("Shutting down compiler %s (no space to run compilers)", comp->name());

     // Only one thread per compiler runtime object enters here

     // Set state to shut down

     comp->set_shut_down();

     MutexLocker mu(MethodCompileQueue_lock, thread);

     CompileQueue* queue;

     if (_c1_method_queue != NULL) {

       _c1_method_queue->delete_all();

       queue = _c1_method_queue;

       _c1_method_queue = NULL;

       delete _c1_method_queue;

     }

     if (_c2_method_queue != NULL) {

       _c2_method_queue->delete_all();

       queue = _c2_method_queue;

       _c2_method_queue = NULL;

       delete _c2_method_queue;

     }

     // We could delete compiler runtimes also. However, there are references to

     // the compiler runtime(s) (e.g.,  nmethod::is_compiled_by_c1()) which then

     // fail. This can be done later if necessary.

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::compiler_thread_loop

 //

 // The main loop run by a CompilerThread.

 void CompileBroker::compiler_thread_loop() {

   CompilerThread* thread = CompilerThread::current();

   CompileQueue* queue = thread->queue();

   // For the thread that initializes the ciObjectFactory

   // this resource mark holds all the shared objects

   ResourceMark rm;

   // First thread to get here will initialize the compiler interface

   if (!ciObjectFactory::is_initialized()) {

     ASSERT_IN_VM;

     MutexLocker only_one (CompileThread_lock, thread);

     if (!ciObjectFactory::is_initialized()) {

       ciObjectFactory::initialize();

     }

   }

   // Open a log.

   if (LogCompilation) {

     init_compiler_thread_log();

   }

   CompileLog* log = thread->log();

   if (log != NULL) {

     log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",

                     thread->name(),

                     os::current_thread_id(),

                     os::current_process_id());

     log->stamp();

     log->end_elem();

   }

   // If compiler thread/runtime initialization fails, exit the compiler thread

   if (!init_compiler_runtime()) {

     return;

   }

   // Poll for new compilation tasks as long as the JVM runs. Compilation

   // should only be disabled if something went wrong while initializing the

   // compiler runtimes. This, in turn, should not happen. The only known case

   // when compiler runtime initialization fails is if there is not enough free

   // space in the code cache to generate the necessary stubs, etc.

   while (!is_compilation_disabled_forever()) {

     // We need this HandleMark to avoid leaking VM handles.

     HandleMark hm(thread);

     if (CodeCache::unallocated_capacity() < CodeCacheMinimumFreeSpace) {

       // the code cache is really full

       handle_full_code_cache();

     }

     CompileTask* task = queue->get();

     if (task == NULL) {

       continue;

     }

     // Give compiler threads an extra quanta.  They tend to be bursty and

     // this helps the compiler to finish up the job.

     if( CompilerThreadHintNoPreempt )

       os::hint_no_preempt();

     // trace per thread time and compile statistics

     CompilerCounters* counters = ((CompilerThread*)thread)->counters();

     PerfTraceTimedEvent(counters->time_counter(), counters->compile_counter());

     // Assign the task to the current thread.  Mark this compilation

     // thread as active for the profiler.

     CompileTaskWrapper ctw(task);

     nmethodLocker result_handle;  // (handle for the nmethod produced by this task)

     task->set_code_handle(&result_handle);

     methodHandle method(thread, task->method());

     // Never compile a method if breakpoints are present in it

     if (method()->number_of_breakpoints() == 0) {

       // Compile the method.

       if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {

         invoke_compiler_on_method(task);

       } else {

         // After compilation is disabled, remove remaining methods from queue

         method->clear_queued_for_compilation();

         task->set_failure_reason("compilation is disabled");

       }

     }

   }

   // Shut down compiler runtime

   shutdown_compiler_runtime(thread->compiler(), thread);

 }

 // ------------------------------------------------------------------

 // CompileBroker::init_compiler_thread_log

 //

 // Set up state required by +LogCompilation.

 void CompileBroker::init_compiler_thread_log() {

     CompilerThread* thread = CompilerThread::current();

     char  file_name[4*K];

     FILE* fp = NULL;

     intx thread_id = os::current_thread_id();

     for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {

       const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);

       if (dir == NULL) {

         jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",

                      thread_id, os::current_process_id());

       } else {

         jio_snprintf(file_name, sizeof(file_name),

                      "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,

                      os::file_separator(), thread_id, os::current_process_id());

       }

       fp = fopen(file_name, "at");

       if (fp != NULL) {

         if (LogCompilation && Verbose) {

           tty->print_cr("Opening compilation log %s", file_name);

         }

         CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);

         thread->init_log(log);

         if (xtty != NULL) {

           ttyLocker ttyl;

           // Record any per thread log files

           xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);

         }

         return;

       }

     }

     warning("Cannot open log file: %s", file_name);

 }

 // ------------------------------------------------------------------

 // CompileBroker::set_should_block

 //

 // Set _should_block.

 // Call this from the VM, with Threads_lock held and a safepoint requested.

 void CompileBroker::set_should_block() {

   assert(Threads_lock->owner() == Thread::current(), "must have threads lock");

   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");

 #ifndef PRODUCT

   if (PrintCompilation && (Verbose || WizardMode))

     tty->print_cr("notifying compiler thread pool to block");

 #endif

   _should_block = true;

 }

 // ------------------------------------------------------------------

 // CompileBroker::maybe_block

 //

 // Call this from the compiler at convenient points, to poll for _should_block.

 void CompileBroker::maybe_block() {

   if (_should_block) {

 #ifndef PRODUCT

     if (PrintCompilation && (Verbose || WizardMode))

       tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));

 #endif

     ThreadInVMfromNative tivfn(JavaThread::current());

   }

 }

 // wrapper for CodeCache::print_summary()

 static void codecache_print(bool detailed)

 {

   ResourceMark rm;

   stringStream s;

   // Dump code cache  into a buffer before locking the tty,

   {

     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

     CodeCache::print_summary(&s, detailed);

   }

   ttyLocker ttyl;

   tty->print("%s", s.as_string());

 }

 // ------------------------------------------------------------------

 // CompileBroker::invoke_compiler_on_method

 //

 // Compile a method.

 //

 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {

   if (PrintCompilation) {

     ResourceMark rm;

     task->print_line();

   }

   elapsedTimer time;

   CompilerThread* thread = CompilerThread::current();

   ResourceMark rm(thread);

   if (LogEvents) {

     _compilation_log->log_compile(thread, task);

   }

   // Common flags.

   uint compile_id = task->compile_id();

   int osr_bci = task->osr_bci();

   bool is_osr = (osr_bci != standard_entry_bci);

   bool should_log = (thread->log() != NULL);

   bool should_break = false;

   int task_level = task->comp_level();

   {

     // create the handle inside it's own block so it can't

     // accidentally be referenced once the thread transitions to

     // native.  The NoHandleMark before the transition should catch

     // any cases where this occurs in the future.

     methodHandle method(thread, task->method());

     should_break = check_break_at(method, compile_id, is_osr);

     if (should_log && !CompilerOracle::should_log(method)) {

       should_log = false;

     }

     assert(!method->is_native(), "no longer compile natives");

     // Save information about this method in case of failure.

     set_last_compile(thread, method, is_osr, task_level);

     DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));

   }

   // Allocate a new set of JNI handles.

   push_jni_handle_block();

   Method* target_handle = task->method();

   int compilable = ciEnv::MethodCompilable;

   {

     int system_dictionary_modification_counter;

     {

       MutexLocker locker(Compile_lock, thread);

       system_dictionary_modification_counter = SystemDictionary::number_of_modifications();

     }

     NoHandleMark  nhm;

     ThreadToNativeFromVM ttn(thread);

     ciEnv ci_env(task, system_dictionary_modification_counter);

     if (should_break) {

       ci_env.set_break_at_compile(true);

     }

     if (should_log) {

       ci_env.set_log(thread->log());

     }

     assert(thread->env() == &ci_env, "set by ci_env");

     // The thread-env() field is cleared in ~CompileTaskWrapper.

     // Cache Jvmti state

     ci_env.cache_jvmti_state();

     // Cache DTrace flags

     ci_env.cache_dtrace_flags();

     ciMethod* target = ci_env.get_method_from_handle(target_handle);

     TraceTime t1("compilation", &time);

     EventCompilation event;

     AbstractCompiler *comp = compiler(task_level);

     if (comp == NULL) {

       ci_env.record_method_not_compilable("no compiler", !TieredCompilation);

     } else {

       comp->compile_method(&ci_env, target, osr_bci);

     }

     if (!ci_env.failing() && task->code() == NULL) {

       //assert(false, "compiler should always document failure");

       // The compiler elected, without comment, not to register a result.

       // Do not attempt further compilations of this method.

       ci_env.record_method_not_compilable("compile failed", !TieredCompilation);

     }

     // Copy this bit to the enclosing block:

     compilable = ci_env.compilable();

     if (ci_env.failing()) {

       task->set_failure_reason(ci_env.failure_reason());

       const char* retry_message = ci_env.retry_message();

       if (_compilation_log != NULL) {

         _compilation_log->log_failure(thread, task, ci_env.failure_reason(), retry_message);

       }

       if (PrintCompilation) {

         FormatBufferResource msg = retry_message != NULL ?

             err_msg_res("COMPILE SKIPPED: %s (%s)", ci_env.failure_reason(), retry_message) :

             err_msg_res("COMPILE SKIPPED: %s",      ci_env.failure_reason());

         task->print_compilation(tty, msg);

       }

     } else {

       task->mark_success();

       task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());

       if (_compilation_log != NULL) {

         nmethod* code = task->code();

         if (code != NULL) {

           _compilation_log->log_nmethod(thread, code);

         }

       }

     }

     // simulate crash during compilation

     assert(task->compile_id() != CICrashAt, "just as planned");

     if (event.should_commit()) {

       event.set_method(target->get_Method());

       event.set_compileID(compile_id);

       event.set_compileLevel(task->comp_level());

       event.set_succeded(task->is_success());

       event.set_isOsr(is_osr);

       event.set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());

       event.set_inlinedBytes(task->num_inlined_bytecodes());

       event.commit();

     }

   }

   pop_jni_handle_block();

   methodHandle method(thread, task->method());

   DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());

   collect_statistics(thread, time, task);

   if (PrintCompilation && PrintCompilation2) {

     tty->print("%7d ", (int) tty->time_stamp().milliseconds());  // print timestamp

     tty->print("%4d ", compile_id);    // print compilation number

     tty->print("%s ", (is_osr ? "%" : " "));

     if (task->code() != NULL) {

       tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());

     }

     tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());

   }

   if (PrintCodeCacheOnCompilation)

     codecache_print(/* detailed= */ false);

   // Disable compilation, if required.

   switch (compilable) {

   case ciEnv::MethodCompilable_never:

     if (is_osr)

       method->set_not_osr_compilable_quietly();

     else

       method->set_not_compilable_quietly();

     break;

   case ciEnv::MethodCompilable_not_at_tier:

     if (is_osr)

       method->set_not_osr_compilable_quietly(task_level);

     else

       method->set_not_compilable_quietly(task_level);

     break;

   }

   // Note that the queued_for_compilation bits are cleared without

   // protection of a mutex. [They were set by the requester thread,

   // when adding the task to the compile queue -- at which time the

   // compile queue lock was held. Subsequently, we acquired the compile

   // queue lock to get this task off the compile queue; thus (to belabour

   // the point somewhat) our clearing of the bits must be occurring

   // only after the setting of the bits. See also 14012000 above.

   method->clear_queued_for_compilation();

 #ifdef ASSERT

   if (CollectedHeap::fired_fake_oom()) {

     // The current compile received a fake OOM during compilation so

     // go ahead and exit the VM since the test apparently succeeded

     tty->print_cr("*** Shutting down VM after successful fake OOM");

     vm_exit(0);

   }

 #endif

 }

 /**

  * The CodeCache is full.  Print out warning and disable compilation

  * or try code cache cleaning so compilation can continue later.

  */

 void CompileBroker::handle_full_code_cache() {

   UseInterpreter = true;

   if (UseCompiler || AlwaysCompileLoopMethods ) {

     if (xtty != NULL) {

       ResourceMark rm;

       stringStream s;

       // Dump code cache state into a buffer before locking the tty,

       // because log_state() will use locks causing lock conflicts.

       CodeCache::log_state(&s);

       // Lock to prevent tearing

       ttyLocker ttyl;

       xtty->begin_elem("code_cache_full");

       xtty->print("%s", s.as_string());

       xtty->stamp();

       xtty->end_elem();

     }

     CodeCache::report_codemem_full();

 #ifndef PRODUCT

     if (CompileTheWorld || ExitOnFullCodeCache) {

       codecache_print(/* detailed= */ true);

       before_exit(JavaThread::current());

       exit_globals(); // will delete tty

       vm_direct_exit(CompileTheWorld ? 0 : 1);

     }

 #endif

     if (UseCodeCacheFlushing) {

       // Since code cache is full, immediately stop new compiles

       if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {

         NMethodSweeper::log_sweep("disable_compiler");

       }

       // Switch to 'vm_state'. This ensures that possibly_sweep() can be called

       // without having to consider the state in which the current thread is.

       ThreadInVMfromUnknown in_vm;

       NMethodSweeper::possibly_sweep();

     } else {

       disable_compilation_forever();

     }

     // Print warning only once

     if (should_print_compiler_warning()) {

       warning("CodeCache is full. Compiler has been disabled.");

       warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");

       codecache_print(/* detailed= */ true);

     }

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::set_last_compile

 //

 // Record this compilation for debugging purposes.

 void CompileBroker::set_last_compile(CompilerThread* thread, methodHandle method, bool is_osr, int comp_level) {

   ResourceMark rm;

   char* method_name = method->name()->as_C_string();

   strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);

   _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated

   char current_method[CompilerCounters::cmname_buffer_length];

   size_t maxLen = CompilerCounters::cmname_buffer_length;

   if (UsePerfData) {

     const char* class_name = method->method_holder()->name()->as_C_string();

     size_t s1len = strlen(class_name);

     size_t s2len = strlen(method_name);

     // check if we need to truncate the string

     if (s1len + s2len + 2 > maxLen) {

       // the strategy is to lop off the leading characters of the

       // class name and the trailing characters of the method name.

       if (s2len + 2 > maxLen) {

         // lop of the entire class name string, let snprintf handle

         // truncation of the method name.

         class_name += s1len; // null string

       }

       else {

         // lop off the extra characters from the front of the class name

         class_name += ((s1len + s2len + 2) - maxLen);

       }

     }

     jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);

   }

   if (CICountOSR && is_osr) {

     _last_compile_type = osr_compile;

   } else {

     _last_compile_type = normal_compile;

   }

   _last_compile_level = comp_level;

   if (UsePerfData) {

     CompilerCounters* counters = thread->counters();

     counters->set_current_method(current_method);

     counters->set_compile_type((jlong)_last_compile_type);

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::push_jni_handle_block

 //

 // Push on a new block of JNI handles.

 void CompileBroker::push_jni_handle_block() {

   JavaThread* thread = JavaThread::current();

   // Allocate a new block for JNI handles.

   // Inlined code from jni_PushLocalFrame()

   JNIHandleBlock* java_handles = thread->active_handles();

   JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);

   assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");

   compile_handles->set_pop_frame_link(java_handles);  // make sure java handles get gc'd.

   thread->set_active_handles(compile_handles);

 }

 // ------------------------------------------------------------------

 // CompileBroker::pop_jni_handle_block

 //

 // Pop off the current block of JNI handles.

 void CompileBroker::pop_jni_handle_block() {

   JavaThread* thread = JavaThread::current();

   // Release our JNI handle block

   JNIHandleBlock* compile_handles = thread->active_handles();

   JNIHandleBlock* java_handles = compile_handles->pop_frame_link();

   thread->set_active_handles(java_handles);

   compile_handles->set_pop_frame_link(NULL);

   JNIHandleBlock::release_block(compile_handles, thread); // may block

 }

 // ------------------------------------------------------------------

 // CompileBroker::check_break_at

 //

 // Should the compilation break at the current compilation.

 bool CompileBroker::check_break_at(methodHandle method, int compile_id, bool is_osr) {

   if (CICountOSR && is_osr && (compile_id == CIBreakAtOSR)) {

     return true;

   } else if( CompilerOracle::should_break_at(method) ) { // break when compiling

     return true;

   } else {

     return (compile_id == CIBreakAt);

   }

 }

 // ------------------------------------------------------------------

 // CompileBroker::collect_statistics

 //

 // Collect statistics about the compilation.

 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {

   bool success = task->is_success();

   methodHandle method (thread, task->method());

   uint compile_id = task->compile_id();

   bool is_osr = (task->osr_bci() != standard_entry_bci);

   nmethod* code = task->code();

   CompilerCounters* counters = thread->counters();

   assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");

   MutexLocker locker(CompileStatistics_lock);

   // _perf variables are production performance counters which are

   // updated regardless of the setting of the CITime and CITimeEach flags

   //

   if (!success) {

     _total_bailout_count++;

     if (UsePerfData) {

       _perf_last_failed_method->set_value(counters->current_method());

       _perf_last_failed_type->set_value(counters->compile_type());

       _perf_total_bailout_count->inc();

     }

   } else if (code == NULL) {

     if (UsePerfData) {

       _perf_last_invalidated_method->set_value(counters->current_method());

       _perf_last_invalidated_type->set_value(counters->compile_type());

       _perf_total_invalidated_count->inc();

     }

     _total_invalidated_count++;

   } else {

     // Compilation succeeded

     // update compilation ticks - used by the implementation of

     // java.lang.management.CompilationMBean

     _perf_total_compilation->inc(time.ticks());

     _t_total_compilation.add(time);

     _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;

     if (CITime) {

       if (is_osr) {

         _t_osr_compilation.add(time);

         _sum_osr_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();

       } else {

         _t_standard_compilation.add(time);

         _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();

       }

     }

     if (UsePerfData) {

       // save the name of the last method compiled

       _perf_last_method->set_value(counters->current_method());

       _perf_last_compile_type->set_value(counters->compile_type());

       _perf_last_compile_size->set_value(method->code_size() +

                                          task->num_inlined_bytecodes());

       if (is_osr) {

         _perf_osr_compilation->inc(time.ticks());

         _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());

       } else {

         _perf_standard_compilation->inc(time.ticks());

         _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());

       }

     }

     if (CITimeEach) {

       float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();

       tty->print_cr("%3d   seconds: %f bytes/sec : %f (bytes %d + %d inlined)",

                     compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());

     }

     // Collect counts of successful compilations

     _sum_nmethod_size      += code->total_size();

     _sum_nmethod_code_size += code->insts_size();

     _total_compile_count++;

     if (UsePerfData) {

       _perf_sum_nmethod_size->inc(     code->total_size());

       _perf_sum_nmethod_code_size->inc(code->insts_size());

       _perf_total_compile_count->inc();

     }

     if (is_osr) {

       if (UsePerfData) _perf_total_osr_compile_count->inc();

       _total_osr_compile_count++;

     } else {

       if (UsePerfData) _perf_total_standard_compile_count->inc();

       _total_standard_compile_count++;

     }

   }

   // set the current method for the thread to null

   if (UsePerfData) counters->set_current_method("");

 }

 const char* CompileBroker::compiler_name(int comp_level) {

   AbstractCompiler *comp = CompileBroker::compiler(comp_level);

   if (comp == NULL) {

     return "no compiler";

   } else {

     return (comp->name());

   }

 }

 void CompileBroker::print_times() {

   tty->cr();

   tty->print_cr("Accumulated compiler times (for compiled methods only)");

   tty->print_cr("------------------------------------------------");

                //0000000000111111111122222222223333333333444444444455555555556666666666

                //0123456789012345678901234567890123456789012345678901234567890123456789

   tty->print_cr("  Total compilation time   : %6.3f s", CompileBroker::_t_total_compilation.seconds());

   tty->print_cr("    Standard compilation   : %6.3f s, Average : %2.3f",

                 CompileBroker::_t_standard_compilation.seconds(),

                 CompileBroker::_t_standard_compilation.seconds() / CompileBroker::_total_standard_compile_count);

   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);

   AbstractCompiler *comp = compiler(CompLevel_simple);

   if (comp != NULL) {

     comp->print_timers();

   }

   comp = compiler(CompLevel_full_optimization);

   if (comp != NULL) {

     comp->print_timers();

   }

   tty->cr();

   tty->print_cr("  Total compiled methods   : %6d methods", CompileBroker::_total_compile_count);

   tty->print_cr("    Standard compilation   : %6d methods", CompileBroker::_total_standard_compile_count);

   tty->print_cr("    On stack replacement   : %6d methods", CompileBroker::_total_osr_compile_count);

   int tcb = CompileBroker::_sum_osr_bytes_compiled + CompileBroker::_sum_standard_bytes_compiled;

   tty->print_cr("  Total compiled bytecodes : %6d bytes", tcb);

   tty->print_cr("    Standard compilation   : %6d bytes", CompileBroker::_sum_standard_bytes_compiled);

   tty->print_cr("    On stack replacement   : %6d bytes", CompileBroker::_sum_osr_bytes_compiled);

   int bps = (int)(tcb / CompileBroker::_t_total_compilation.seconds());

   tty->print_cr("  Average compilation speed: %6d bytes/s", bps);

   tty->cr();

   tty->print_cr("  nmethod code size        : %6d bytes", CompileBroker::_sum_nmethod_code_size);

   tty->print_cr("  nmethod total size       : %6d bytes", CompileBroker::_sum_nmethod_size);

 }

 // Debugging output for failure

 void CompileBroker::print_last_compile() {

   if ( _last_compile_level != CompLevel_none &&

        compiler(_last_compile_level) != NULL &&

        _last_method_compiled != NULL &&

        _last_compile_type != no_compile) {

     if (_last_compile_type == osr_compile) {

       tty->print_cr("Last parse:  [osr]%d+++(%d) %s",

                     _osr_compilation_id, _last_compile_level, _last_method_compiled);

     } else {

       tty->print_cr("Last parse:  %d+++(%d) %s",

                     _compilation_id, _last_compile_level, _last_method_compiled);

     }

   }

 }

 void CompileBroker::print_compiler_threads_on(outputStream* st) {

 #ifndef PRODUCT

   st->print_cr("Compiler thread printing unimplemented.");

   st->cr();

 #endif

 }