FSM* IRParser::parseFSM(llvm::MDNode* node){
FSM* fsm = new FSM();
//Parse initial state
MDString* initialState = cast<MDString>(node->getOperand(0));
//Parse all fsm state
MDNode* stateArray = cast<MDNode>(node->getOperand(1));
for (unsigned i = 0, e = stateArray->getNumOperands(); i != e; ++i){
MDString* stateMD = cast<MDString>(stateArray->getOperand(i));
fsm->addState(stateMD->getString());
}
// set the initial state after initializing the states
fsm->setInitialState(initialState->getString());
//Parse transition
MDNode* transitionsArray = cast<MDNode>(node->getOperand(2));
for (unsigned i = 0, e = transitionsArray->getNumOperands(); i != e; ++i){
MDNode* transitionArray = cast<MDNode>(transitionsArray->getOperand(i));
MDString* source = cast<MDString>(transitionArray->getOperand(0));
Value* targetValue = transitionArray->getOperand(1);
//In case of "undefined" state, no target are given
if (targetValue != NULL){
MDNode* targetsArray = cast<MDNode>(targetValue);
for (unsigned j = 0, f = targetsArray->getNumOperands() ; j != f; ++j){
MDNode* targetArray = cast<MDNode>(targetsArray->getOperand(j));
Action* action = getAction(cast<MDNode>(targetArray->getOperand(0)));
MDString* target = cast<MDString>(targetArray->getOperand(1));
fsm->addTransition(source->getString(), target->getString(), action);
}
}
}
return fsm;
}
FSM* IRWriter::writeFSM(FSM* fsm){
list<llvm::Function*>::iterator it;
FSM* newFSM = new FSM();
//Copy states of the source fsm
std::map<std::string, FSM::State*>::iterator itState;
std::map<std::string, FSM::State*>* states = fsm->getStates();
for (itState = states->begin(); itState != states->end(); itState++){
newFSM->addState(itState->first);
}
//Copy transitions of the source fsm
map<string, Action*>::iterator itActionsMap;
std::map<std::string, FSM::Transition*>::iterator itTransition;
std::map<std::string, FSM::Transition*>* transitions = fsm->getTransitions();
for (itTransition = transitions->begin(); itTransition != transitions->end(); itTransition++){
FSM::Transition* transition = itTransition->second;
FSM::State* sourceState = transition->getSourceState();
list<FSM::NextStateInfo*>::iterator itNextStateInfo;
list<FSM::NextStateInfo*>* nextStateInfos = transition->getNextStateInfo();
for (itNextStateInfo = nextStateInfos->begin(); itNextStateInfo != nextStateInfos->end(); itNextStateInfo++){
FSM::State* targetState = (*itNextStateInfo)->getTargetState();
Action* targetAction = (*itNextStateInfo)->getAction();
newFSM->addTransition(sourceState->getName(), targetState->getName(), getAction(targetAction));
}
}
//Set initiale state of the FSM
newFSM->setInitialState(fsm->getInitialState()->getName());
return newFSM;
}