MachineCode* CompiledCode::internalize(STATE, GCToken gct,
const char** reason, int* ip)
{
MachineCode* mcode = machine_code_;
atomic::memory_barrier();
if(mcode) return mcode;
CompiledCode* self = this;
OnStack<1> os(state, self);
self->hard_lock(state, gct);
mcode = self->machine_code_;
if(!mcode) {
{
BytecodeVerification bv(self);
if(!bv.verify(state)) {
if(reason) *reason = bv.failure_reason();
if(ip) *ip = bv.failure_ip();
std::cerr << "Error validating bytecode: " << bv.failure_reason() << "\n";
return 0;
}
}
mcode = new MachineCode(state, self);
if(self->resolve_primitive(state)) {
mcode->fallback = execute;
} else {
mcode->setup_argument_handler();
}
// We need to have an explicit memory barrier here, because we need to
// be sure that mcode is completely initialized before it's set.
// Otherwise another thread might see a partially initialized
// MachineCode.
atomic::write(&self->machine_code_, mcode);
set_executor(mcode->fallback);
}
self->hard_unlock(state, gct);
return mcode;
}
MachineCode* CompiledCode::internalize(STATE) {
timer::StopWatch<timer::microseconds> timer(
state->vm()->metrics().machine.bytecode_internalizer_us);
atomic::memory_barrier();
MachineCode* mcode = machine_code();
if(mcode) return mcode;
{
BytecodeVerifier bytecode_verifier(this);
bytecode_verifier.verify(state);
}
mcode = new MachineCode(state, this);
if(resolve_primitive(state)) {
mcode->fallback = execute;
} else {
mcode->setup_argument_handler();
}
/* There is a race here because another Thread may have run this
* CompiledCode instance and internalized it. We attempt to store our
* version assuming that we are the only ones to do so and throw away our
* work if someone else has beat us to it.
*/
MachineCode** mcode_ptr = &_machine_code_;
if(atomic::compare_and_swap(reinterpret_cast<void**>(mcode_ptr), 0, mcode)) {
set_executor(mcode->fallback);
return mcode;
} else {
return machine_code();
}
}