void gc_scan(GarbageCollector* gc) {
utilities::thread::Mutex::LockGuard guard(mutex_);
for(std::list<BackgroundCompileRequest*>::iterator i = pending_requests_.begin();
i != pending_requests_.end();
++i)
{
BackgroundCompileRequest* req = *i;
if(Object* obj = gc->saw_object(req->method())) {
req->set_method(force_as<CompiledCode>(obj));
}
if(Class* receiver_class = req->receiver_class()) {
req->set_receiver_class(as<Class>(gc->saw_object(receiver_class)));
}
if(BlockEnvironment* block_env = req->block_env()) {
req->set_block_env(as<BlockEnvironment>(gc->saw_object(block_env)));
}
}
if(current_compiler_) {
jit::RuntimeDataHolder* rd = current_compiler_->context()->runtime_data_holder();
rd->set_mark();
ObjectMark mark(gc);
rd->mark_all(current_req_->method(), mark);
}
}
virtual void perform() {
const char* thread_name = "rbx.jit";
ManagedThread::set_current(ls_, thread_name);
ls_->set_run_state(ManagedThread::eIndependent);
RUBINIUS_THREAD_START(thread_name, ls_->thread_id(), 1);
#ifndef RBX_WINDOWS
sigset_t set;
sigfillset(&set);
pthread_sigmask(SIG_SETMASK, &set, NULL);
#endif
for(;;) { // forever
BackgroundCompileRequest* req = 0;
// Lock, wait, get a request, unlock
{
utilities::thread::Mutex::LockGuard guard(mutex_);
if(pause_) {
state = cPaused;
paused_ = true;
pause_condition_.broadcast();
if(stop_) goto halt;
while(pause_) {
condition_.wait(mutex_);
if(stop_) goto halt;
}
state = cUnknown;
paused_ = false;
}
// If we've been asked to stop, do so now.
if(stop_) goto halt;
while(pending_requests_.empty()) {
state = cIdle;
// unlock and wait...
condition_.wait(mutex_);
if(stop_) goto halt;
}
// now locked again, shift a request
req = pending_requests_.front();
state = cRunning;
}
// This isn't ideal, but it's the safest. Keep the GC from
// running while we're building the IR.
ls_->gc_dependent();
Context ctx(ls_);
jit::Compiler jit(&ctx);
// mutex now unlock, allowing others to push more requests
//
current_req_ = req;
current_compiler_ = &jit;
int spec_id = 0;
Class* cls = req->receiver_class();
if(cls && !cls->nil_p()) {
spec_id = cls->class_id();
}
void* func = 0;
{
timer::Running<1000000> timer(ls_->shared().stats.jit_time_spent);
jit.compile(req);
func = jit.generate_function();
}
// We were unable to compile this function, likely
// because it's got something we don't support.
if(!func) {
if(ls_->config().jit_show_compiling) {
CompiledCode* code = req->method();
llvm::outs() << "[[[ JIT error background compiling "
<< ls_->enclosure_name(code) << "#" << ls_->symbol_debug_str(code->name())
<< (req->is_block() ? " (block)" : " (method)")
<< " ]]]\n";
}
// If someone was waiting on this, wake them up.
if(utilities::thread::Condition* cond = req->waiter()) {
cond->signal();
}
current_req_ = 0;
current_compiler_ = 0;
pending_requests_.pop_front();
delete req;
// We don't depend on the GC here, so let it run independent
// of us.
ls_->gc_independent();
continue;
}
if(show_machine_code_) {
jit.show_machine_code();
}
// If the method has had jit'ing request disabled since we started
// JIT'ing it, discard our work.
if(!req->machine_code()->jit_disabled()) {
jit::RuntimeDataHolder* rd = ctx.runtime_data_holder();
atomic::memory_barrier();
ls_->start_method_update();
if(!req->is_block()) {
if(spec_id) {
req->method()->add_specialized(spec_id, reinterpret_cast<executor>(func), rd);
} else {
req->method()->set_unspecialized(reinterpret_cast<executor>(func), rd);
}
} else {
req->method()->set_unspecialized(reinterpret_cast<executor>(func), rd);
}
req->machine_code()->clear_compiling();
// assert(req->method()->jit_data());
ls_->end_method_update();
rd->run_write_barrier(ls_->write_barrier(), req->method());
ls_->shared().stats.jitted_methods++;
if(ls_->config().jit_show_compiling) {
CompiledCode* code = req->method();
llvm::outs() << "[[[ JIT finished background compiling "
<< ls_->enclosure_name(code) << "#" << ls_->symbol_debug_str(code->name())
<< (req->is_block() ? " (block)" : " (method)")
<< " ]]]\n";
}
}
// If someone was waiting on this, wake them up.
if(utilities::thread::Condition* cond = req->waiter()) {
cond->signal();
}
current_req_ = 0;
current_compiler_ = 0;
pending_requests_.pop_front();
delete req;
// We don't depend on the GC here, so let it run independent
// of us.
ls_->gc_independent();
}
halt:
RUBINIUS_THREAD_STOP(thread_name, ls_->thread_id(), 1);
}