6953144: Tiered compilation
Summary: Infrastructure for tiered compilation support (interpreter + c1 + c2) for 32 and 64 bit. Simple tiered policy implementation.
Reviewed-by: kvn, never, phh, twisti
/*
* Copyright (c) 1999, 2010, 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 "incls/_precompiled.incl"
#include "incls/_compileBroker.cpp.incl"
#ifdef DTRACE_ENABLED
// Only bother with this argument setup if dtrace is available
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(compiler, method) \
{ \
char* comp_name = (char*)(compiler)->name(); \
symbolOop klass_name = (method)->klass_name(); \
symbolOop name = (method)->name(); \
symbolOop 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(compiler, method, success) \
{ \
char* comp_name = (char*)(compiler)->name(); \
symbolOop klass_name = (method)->klass_name(); \
symbolOop name = (method)->name(); \
symbolOop 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 // ndef DTRACE_ENABLED
#define DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler, method)
#define DTRACE_METHOD_COMPILE_END_PROBE(compiler, method, success)
#endif // ndef DTRACE_ENABLED
bool CompileBroker::_initialized = false;
volatile bool CompileBroker::_should_block = false;
volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
// The installed compiler(s)
AbstractCompiler* CompileBroker::_compilers[2];
// These counters are used for assigning id's to each compilation
uint CompileBroker::_compilation_id = 0;
uint 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;
CompileQueue* CompileBroker::_c2_method_queue = NULL;
CompileQueue* CompileBroker::_c1_method_queue = NULL;
CompileTask* CompileBroker::_task_free_list = NULL;
GrowableArray<CompilerThread*>* CompileBroker::_method_threads = NULL;
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);
DEBUG_ONLY(thread->set_env((ciEnv*)badAddress));
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 = JNIHandles::make_global(method);
_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_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 = JNIHandles::make_global(hot_method);
}
}
}
_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");
if (_hot_method != NULL && _hot_method != _method) {
JNIHandles::destroy_global(_hot_method);
}
JNIHandles::destroy_global(_method);
}
// ------------------------------------------------------------------
// CompileTask::print
void CompileTask::print() {
tty->print("<CompileTask compile_id=%d ", _compile_id);
tty->print("method=");
((methodOop)JNIHandles::resolve(_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));
}
void CompileTask::print_compilation(outputStream *st, methodOop method, char* method_name) {
nmethod::print_compilation(st, method_name,/*title*/ NULL, method,
is_blocking(), compile_id(), osr_bci(), comp_level());
}
// ------------------------------------------------------------------
// 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) {
methodOop method = (methodOop)JNIHandles::resolve(_method);
// print compiler name
st->print("%s:", CompileBroker::compiler(comp_level())->name());
char* method_name = NULL;
if (method != NULL) {
method_name = method->name_and_sig_as_C_string(buf, buflen);
}
print_compilation(st, method, method_name);
}
// ------------------------------------------------------------------
// CompileTask::print_line
void CompileTask::print_line() {
Thread *thread = Thread::current();
methodHandle method(thread,
(methodOop)JNIHandles::resolve(method_handle()));
ResourceMark rm(thread);
ttyLocker ttyl; // keep the following output all in one block
// print compiler name if requested
if (CIPrintCompilerName) tty->print("%s:", CompileBroker::compiler(comp_level())->name());
print_compilation(tty, method(), NULL);
}
// ------------------------------------------------------------------
// CompileTask::log_task
void CompileTask::log_task(xmlStream* log) {
Thread* thread = Thread::current();
methodHandle method(thread,
(methodOop)JNIHandles::resolve(method_handle()));
ResourceMark rm(thread);
// <task id='9' method='M' osr_bci='X' level='1' blocking='1' stamp='1.234'>
if (_compile_id != 0) 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,
(methodOop)JNIHandles::resolve(_hot_method));
methodHandle method(thread,
(methodOop)JNIHandles::resolve(_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,
(methodOop)JNIHandles::resolve(method_handle()));
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();
}
// ------------------------------------------------------------------
// CompileQueue::add
//
// 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.
((methodOop)JNIHandles::resolve(task->method_handle()))->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();
}
// ------------------------------------------------------------------
// CompileQueue::get
//
// Get the next CompileTask from a CompileQueue
CompileTask* CompileQueue::get() {
NMethodSweeper::possibly_sweep();
MutexLocker locker(lock());
// Wait for an available CompileTask.
while (_first == NULL) {
// There is no work to be done right now. Wait.
if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() || CodeCache::needs_flushing())) {
// During the emergency sweeping periods, wake up and sweep occasionally
bool timedout = lock()->wait(!Mutex::_no_safepoint_check_flag, NmethodSweepCheckInterval*1000);
if (timedout) {
MutexUnlocker ul(lock());
// When otherwise not busy, run nmethod sweeping
NMethodSweeper::possibly_sweep();
}
} else {
// During normal operation no need to wake up on timer
lock()->wait();
}
}
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;
}
// ------------------------------------------------------------------
// 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';
// 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
#ifdef SHARK
#if defined(COMPILER1) || defined(COMPILER2)
#error "Can't use COMPILER1 or COMPILER2 with shark"
#endif
_compilers[0] = new SharkCompiler();
_compilers[1] = _compilers[0];
#endif
// 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;
}
// ------------------------------------------------------------------
// CompileBroker::make_compiler_thread
CompilerThread* CompileBroker::make_compiler_thread(const char* name, CompileQueue* queue, CompilerCounters* counters, TRAPS) {
CompilerThread* compiler_thread = NULL;
klassOop k =
SystemDictionary::resolve_or_fail(vmSymbolHandles::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,
vmSymbolHandles::object_initializer_name(),
vmSymbolHandles::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);
// CLEANUP PRIORITIES: This -if- statement hids a bug whereby the compiler
// threads never have their OS priority set. The assumption here is to
// enable the Performance group to do flag tuning, figure out a suitable
// CompilerThreadPriority, and then remove this 'if' statement (and
// comment) and unconditionally set the priority.
// Compiler Threads should be at the highest Priority
if ( CompilerThreadPriority != -1 )
os::set_native_priority( compiler_thread, CompilerThreadPriority );
else
os::set_native_priority( compiler_thread, os::java_to_os_priority[NearMaxPriority]);
// Note that I cannot call os::set_priority because it expects Java
// priorities and I am *explicitly* using OS priorities so that it's
// possible to set the compiler thread priority higher than any Java
// thread.
java_lang_Thread::set_daemon(thread_oop());
compiler_thread->set_threadObj(thread_oop());
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;
}
// ------------------------------------------------------------------
// CompileBroker::init_compiler_threads
//
// Initialize the compilation queue
void CompileBroker::init_compiler_threads(int c1_compiler_count, int c2_compiler_count) {
EXCEPTION_MARK;
assert(c2_compiler_count > 0 || c1_compiler_count > 0, "No compilers?");
if (c2_compiler_count > 0) {
_c2_method_queue = new CompileQueue("C2MethodQueue", MethodCompileQueue_lock);
}
if (c1_compiler_count > 0) {
_c1_method_queue = new CompileQueue("C1MethodQueue", MethodCompileQueue_lock);
}
int compiler_count = c1_compiler_count + c2_compiler_count;
_method_threads =
new (ResourceObj::C_HEAP) 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);
CompilerThread* new_thread = make_compiler_thread(name_buffer, _c2_method_queue, counters, CHECK);
_method_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);
CompilerThread* new_thread = make_compiler_thread(name_buffer, _c1_method_queue, counters, CHECK);
_method_threads->append(new_thread);
}
if (UsePerfData) {
PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes,
compiler_count, CHECK);
}
}
// ------------------------------------------------------------------
// CompileBroker::is_idle
bool CompileBroker::is_idle() {
if (_c2_method_queue != NULL && !_c2_method_queue->is_empty()) {
return false;
} else if (_c1_method_queue != NULL && !_c1_method_queue->is_empty()) {
return false;
} else {
int num_threads = _method_threads->length();
for (int i=0; i<num_threads; i++) {
if (_method_threads->at(i)->task() != NULL) {
return false;
}
}
// No pending or active compilations.
return true;
}
}
// ------------------------------------------------------------------
// 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,
TRAPS) {
// do nothing if compiler thread(s) is not available
if (!_initialized ) {
return;
}
guarantee(!method->is_abstract(), "cannot compile abstract methods");
assert(method->method_holder()->klass_part()->oop_is_instance(),
"sanity check");
assert(!instanceKlass::cast(method->method_holder())->is_not_initialized(),
"method holder must be initialized");
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;
}
// 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;
}
// 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.
uint 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, TRAPS) {
// make sure arguments make sense
assert(method->method_holder()->klass_part()->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(!instanceKlass::cast(method->method_holder())->is_not_initialized(), "method holder must be initialized");
if (!TieredCompilation) {
comp_level = CompLevel_highest_tier;
}
// return quickly if possible
// lock, make sure that the compilation
// isn't prohibited in a straightforward way.
if (compiler(comp_level) == NULL || 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;
if (UseCodeCacheFlushing) {
nmethod* saved = CodeCache::find_and_remove_saved_code(method());
if (saved != NULL) {
method->set_code(method, saved);
return saved;
}
}
} 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()) return NULL;
}
assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
// some prerequisites that are compiler specific
if (compiler(comp_level)->is_c2()) {
method->constants()->resolve_string_constants(CHECK_0);
// Resolve all classes seen in the signature of the method
// we are compiling.
methodOopDesc::load_signature_classes(method, CHECK_0);
}
// 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()) {
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();
}
// If the compiler is shut off due to code cache flushing or otherwise,
// fail out now so blocking compiles dont hang the java thread
if (!should_compile_new_jobs() || (UseCodeCacheFlushing && CodeCache::needs_flushing())) {
CompilationPolicy::policy()->delay_compilation(method());
return NULL;
}
// do the compilation
if (method->is_native()) {
if (!PreferInterpreterNativeStubs) {
(void) AdapterHandlerLibrary::create_native_wrapper(method);
} else {
return NULL;
}
} else {
compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, comment, CHECK_0);
}
// 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()) {
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.
if (is_native &&
(!CICompileNatives || !compiler(comp_level)->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 || !compiler(comp_level)->supports_osr())) {
method->set_not_osr_compilable();
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_quietly();
}
return false;
}
// ------------------------------------------------------------------
// CompileBroker::assign_compile_id
//
// Assign a serialized id number to this compilation request. If the
// number falls out of the allowed range, return a 0. OSR
// compilations may be numbered separately from regular compilations
// if certain debugging flags are used.
uint CompileBroker::assign_compile_id(methodHandle method, int osr_bci) {
assert(MethodCompileQueue_lock->owner() == Thread::current(),
"must hold the compilation queue lock");
bool is_osr = (osr_bci != standard_entry_bci);
assert(!method->is_native(), "no longer compile natives");
uint id;
if (CICountOSR && is_osr) {
id = ++_osr_compilation_id;
if ((uint)CIStartOSR <= id && id < (uint)CIStopOSR) {
return id;
}
} else {
id = ++_compilation_id;
if ((uint)CIStart <= id && id < (uint)CIStop) {
return id;
}
}
// Method was not in the appropriate compilation range.
method->set_not_compilable_quietly();
return 0;
}
// ------------------------------------------------------------------
// 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) {
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,
(methodOop)JNIHandles::resolve(task->method_handle()));
{
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);
}
// ------------------------------------------------------------------
// 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 thread='" UINTX_FORMAT "' process='%d'",
os::current_thread_id(),
os::current_process_id());
log->stamp();
log->end_elem();
}
while (true) {
{
// 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();
} else if (UseCodeCacheFlushing && CodeCache::needs_flushing()) {
// Attempt to start cleaning the code cache while there is still a little headroom
NMethodSweeper::handle_full_code_cache(false);
}
CompileTask* task = queue->get();
// 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,
(methodOop)JNIHandles::resolve(task->method_handle()));
// 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();
}
}
}
}
}
// ------------------------------------------------------------------
// CompileBroker::init_compiler_thread_log
//
// Set up state required by +LogCompilation.
void CompileBroker::init_compiler_thread_log() {
CompilerThread* thread = CompilerThread::current();
char fileBuf[4*K];
FILE* fp = NULL;
char* file = 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(fileBuf, sizeof(fileBuf), "hs_c" UINTX_FORMAT "_pid%u.log",
thread_id, os::current_process_id());
} else {
jio_snprintf(fileBuf, sizeof(fileBuf),
"%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
os::file_separator(), thread_id, os::current_process_id());
}
fp = fopen(fileBuf, "at");
if (fp != NULL) {
file = NEW_C_HEAP_ARRAY(char, strlen(fileBuf)+1);
strcpy(file, fileBuf);
break;
}
}
if (fp == NULL) {
warning("Cannot open log file: %s", fileBuf);
} else {
if (LogCompilation && Verbose)
tty->print_cr("Opening compilation log %s", file);
CompileLog* log = new(ResourceObj::C_HEAP) CompileLog(file, 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);
}
}
}
// ------------------------------------------------------------------
// 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());
}
}
// ------------------------------------------------------------------
// 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);
// 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;
{
// 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,
(methodOop)JNIHandles::resolve(task->method_handle()));
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->comp_level());
DTRACE_METHOD_COMPILE_BEGIN_PROBE(compiler(task->comp_level()), method);
}
// Allocate a new set of JNI handles.
push_jni_handle_block();
jobject target_handle = JNIHandles::make_local(thread, JNIHandles::resolve(task->method_handle()));
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);
compiler(task->comp_level())->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");
}
if (ci_env.failing()) {
// Copy this bit to the enclosing block:
compilable = ci_env.compilable();
if (PrintCompilation) {
const char* reason = ci_env.failure_reason();
if (compilable == ciEnv::MethodCompilable_not_at_tier) {
if (is_highest_tier_compile(ci_env.comp_level())) {
// Already at highest tier, promote to not compilable.
compilable = ciEnv::MethodCompilable_never;
} else {
tty->print_cr("%3d COMPILE SKIPPED: %s (retry at different tier)", compile_id, reason);
}
}
if (compilable == ciEnv::MethodCompilable_never) {
tty->print_cr("%3d COMPILE SKIPPED: %s (not retryable)", compile_id, reason);
} else if (compilable == ciEnv::MethodCompilable) {
tty->print_cr("%3d COMPILE SKIPPED: %s", compile_id, reason);
}
}
} else {
task->mark_success();
task->set_num_inlined_bytecodes(ci_env.num_inlined_bytecodes());
}
}
pop_jni_handle_block();
methodHandle method(thread,
(methodOop)JNIHandles::resolve(task->method_handle()));
DTRACE_METHOD_COMPILE_END_PROBE(compiler(task->comp_level()), method, task->is_success());
collect_statistics(thread, time, task);
if (compilable == ciEnv::MethodCompilable_never) {
if (is_osr) {
method->set_not_osr_compilable();
} else {
method->set_not_compilable_quietly();
}
} else if (compilable == ciEnv::MethodCompilable_not_at_tier) {
method->set_not_compilable_quietly(task->comp_level());
}
// 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
}
// ------------------------------------------------------------------
// CompileBroker::handle_full_code_cache
//
// 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) {
xtty->begin_elem("code_cache_full");
xtty->stamp();
xtty->end_elem();
}
warning("CodeCache is full. Compiler has been disabled.");
warning("Try increasing the code cache size using -XX:ReservedCodeCacheSize=");
#ifndef PRODUCT
if (CompileTheWorld || ExitOnFullCodeCache) {
before_exit(JavaThread::current());
exit_globals(); // will delete tty
vm_direct_exit(CompileTheWorld ? 0 : 1);
}
#endif
if (UseCodeCacheFlushing) {
NMethodSweeper::handle_full_code_cache(true);
} else {
UseCompiler = false;
AlwaysCompileLoopMethods = false;
}
}
}
// ------------------------------------------------------------------
// 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()->klass_part()->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, (methodOop)JNIHandles::resolve(task->method_handle()));
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());
if (CITime) {
_t_total_compilation.add(time);
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("");
}
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);
if (compiler(CompLevel_simple) != NULL) {
compiler(CompLevel_simple)->print_timers();
}
if (compiler(CompLevel_full_optimization) != NULL) {
compiler(CompLevel_full_optimization)->print_timers();
}
tty->cr();
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
}