jdk8-mips64-public/hotspot: src/share/vm/compiler/compileBroker.cpp@f73af4455d7d (annotated)

src/share/vm/compiler/compileBroker.cpp@f73af4455d7d (annotated)

src/share/vm/compiler/compileBroker.cpp

Thu, 29 May 2014 09:56:06 -0700

author: asaha
date: Thu, 29 May 2014 09:56:06 -0700
changeset 6782: f73af4455d7d
parent 6779: 364b73402247
parent 6680: 78bbf4d43a14
child 6876: 710a3c8b516e
child 7179: 7301840ea20e
permissions: -rw-r--r--

Merge

 /*
  * 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;
   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);
   // <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 = CompilationPolicy::policy()->select_task(this);
   remove(task);
   return 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;
 }
 // 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;
   }
   // 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()) {
 #ifdef COMPILER1
         // Allow repeating compilations for the purpose of benchmarking
         // compile speed. This is not useful for customers.
         if (CompilationRepeat != 0) {
           int compile_count = CompilationRepeat;
           while (compile_count > 0) {
             invoke_compiler_on_method(task);
             nmethod* nm = method->code();
             if (nm != NULL) {
               nm->make_zombie();
               method->clear_code();
             }
             compile_count--;
           }
         }
 #endif /* COMPILER1 */
         invoke_compiler_on_method(task);
       } else {
         // After compilation is disabled, remove remaining methods from queue
         method->clear_queued_for_compilation();
       }
     }
   }
   // 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()) {
       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 complie 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
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/compiler/compileBroker.cpp@f73af4455d7d (annotated)

src/share/vm/compiler/compileBroker.cpp