/* * Copyright (c) 1999, 2013, 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* 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() ? "%" : "", nm, nm->code_begin(), 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("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); // 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); // 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(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: // : // <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='%d' 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", 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.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.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); 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 }