void send_all(const ID& client_id)
{
update_packet msg;
msg.type = update_packet::complete;
msg.num_entries = list_.size();
msg.start_index = 0;
msg.end_index = state_index_;
outbound_data<serializer::boost_serializer, update_packet> o_msg(msg);
outbound_data<serializer::boost_serializer, list_type> o_list(list_);
outbound_pair o_pair(o_msg, o_list);
send_to_instance(client_id, header_packet::update, o_pair);
}
void send_updates(const ID& client_id)
{
update_packet msg;
msg.type = update_packet::partial;
msg.num_entries = list_.size();
msg.start_index = last_update_sent_;
msg.end_index = state_index_;
outbound_data<serializer::boost_serializer, update_packet> o_msg(msg);
outbound_data<serializer::boost_serializer, list_type> o_list1(added_list_);
outbound_data<serializer::boost_serializer, list_type> o_list2(removed_list_);
outbound_pair o_list(o_list1, o_list2);
outbound_pair o_pair(o_msg, o_list);
send_to_instance(client_id, header_packet::update, o_pair);
}
/**
* Function representing the <st_factor_ident> prods
*/
void RecursiveDescentParser::st_factor_ident(TableEntry* te) {
if(errorCondition) return;
if(token == TK_LEFT_PARENTHESES)
{
#if DEBUG_PARSER
std::cout << "<st_factor_ident> --> (<o_list>);\n";
#endif
Token leftParen = token;
token = scanner->getToken();
ParamList* pList = o_list();
if(te) {
if(te->getEntryType()!=TableEntry::FUNCTION) {
std::stringstream errorMsg;
errorMsg << "'" << te->getName() << "' is not a function";
errorHandler(errorMsg.str(), leftParen);
} else {
// now makes sure the lists match
FunctionEntry* fe = (FunctionEntry*)te;
if(pList) matchParameters(fe, pList, leftParen);
iCode.threeAddressCode(TAC_PARAM, pList);
iCode.threeAddressCode(
symTab.getNextAddress(), // throw away temporary
TAC_CALL,
fe->getLabel(),
fe->getParamCount()
);
}
} else {
std::stringstream errorMsg;
errorMsg << "Undeclared function";
errorHandler(errorMsg.str(), leftParen);
}
match(TK_RIGHT_PARENTHESES);
match(TK_SEMICOLON);
}
else if(token == TK_LEFT_BRACKET ||
token == TK_ASSIGNMENT)
{
#if DEBUG_PARSER
std::cout << "<st_factor_ident> --> <var_prime>=<exp>;\n";
#endif
VariableEntry* vEntry = (VariableEntry*)te;
Token startToken = token;
attr varAttr = var_prime(vEntry);
match(TK_ASSIGNMENT);
attr expAttr = exp();
if(expAttr.type != varAttr.type) {
std::stringstream errorMsg;
errorMsg << "Type mismatch variable '" << vEntry->getName() << "'";
errorHandler(errorMsg.str(), startToken);
}
if(varAttr.attrib == VA_ARRAY) {
std::stringstream errorMsg;
errorMsg << "Assignment error, array '" << vEntry->getName() << "' must be indexed.";
errorHandler( errorMsg.str(), startToken );
}
if(vEntry->getAttribute() == VA_ARRAY) {
// array addr value to assign index
iCode.threeAddressCode(vEntry->getAttr(), TAC_ASSIGN_TO_ADDRESS_AT, expAttr, varAttr);
} else {
iCode.threeAddressCode(vEntry->getAttr(), TAC_ASSIGN, expAttr);
}
match(TK_SEMICOLON);
}
else
{
errorHandler();
}
}
/**
* Functions representing the <st> productions
*/
void RecursiveDescentParser::st() {
if(token == TK_SEMICOLON)
{
#if DEBUG_PARSER
std::cout << "<st> --> ;\n";
#endif
token = scanner->getToken();
}
else if(token == TK_LEFT_BRACE)
{
#if DEBUG_PARSER
std::cout << "<st> --> <comp_st>\n";
#endif
comp_st();
}
else if(token == TK_IF)
{
#if DEBUG_PARSER
std::cout << "<st> --> if<log_exp><st>else<st>\n";
#endif
token = scanner->getToken();
attr logExp = log_exp();
std::string lbl1 = iCode.getNextLabel();
iCode.threeAddressCode(TAC_IF_FALSE, logExp, lbl1);
st();
std::string lbl2 = iCode.getNextLabel();
iCode.threeAddressCode(TAC_GOTO, lbl2);
match(TK_ELSE);
iCode.threeAddressCode(lbl1);
st();
iCode.threeAddressCode(lbl2);
}
else if(token == TK_WHILE)
{
#if DEBUG_PARSER
std::cout << "<st> --> while<log_exp><st>\n";
#endif
token = scanner->getToken();
std::string lbl1 = iCode.getNextLabel();
iCode.threeAddressCode(lbl1);
std::string lbl2 = iCode.getNextLabel();
attr cond = log_exp();
iCode.threeAddressCode(TAC_IF_FALSE, cond, lbl2);
st();
iCode.threeAddressCode(TAC_GOTO, lbl1);
iCode.threeAddressCode(lbl2);
}
else if(token == TK_RETURN)
{
#if DEBUG_PARSER
std::cout << "<st> --> return(<exp>);\n";
#endif
Token sToken = token;
token = scanner->getToken();
match(TK_LEFT_PARENTHESES);
attr expAttr = exp();
const FunctionEntry* fe = symTab.getCurrentFunction();
if(expAttr.type != fe->getReturnType() && fe->getReturnType() != T_VOID) {
std::stringstream ss;
ss << "Type Mismatch, function '" << fe->getName() << "' must return ";
if(fe->getReturnType() == T_INT) ss << "an integer";
if(fe->getReturnType() == T_CHAR) ss << "a character";
errorHandler(ss.str(), sToken);
}
match(TK_RIGHT_PARENTHESES);
match(TK_SEMICOLON);
iCode.threeAddressCode(TAC_SAVE_RET_VAL, expAttr);
iCode.threeAddressCode(TAC_GOTO, currentReturnLabel);
}
else if(token == TK_SCANF)
{
#if DEBUG_PARSER
std::cout << "<st> --> scanf<i_list>;\n";
#endif
token = scanner->getToken();
ParamList* pList = i_list();
match(TK_SEMICOLON);
iCode.threeAddressCode(TAC_READ, pList);
}
else if(token == TK_PRINTF)
{
#if DEBUG_PARSER
std::cout << "<st> --> printf<o_list>;\n";
#endif
token = scanner->getToken();
ParamList* pList = o_list();
match(TK_SEMICOLON);
iCode.threeAddressCode(TAC_WRITE, pList);
}
else if(token == TK_IDENTIFIER)
{
#if DEBUG_PARSER
std::cout << "<st> --> i<st_factor_ident>\n";
#endif
TableEntry* te=NULL;
if(!symTab.search(token, te)) {
errorHandler("Undefined identifier", token);
}
token = scanner->getToken();
st_factor_ident(te);
}
else if(token == TK_INT)
{
#if DEBUG_PARSER
std::cout << "<st> --> int i <st_factor_type>\n";
#endif
token = scanner->getToken();
if(token!=TK_IDENTIFIER) {
errorHandler();
}
if(symTab.search(token) ) {
std::stringstream msg;
msg << "Duplicate variable declaration '" << token.getValue() << "'";
errorHandler(msg.str(), token);
}
VariableEntry* vEntry = new VariableEntry();
vEntry->setType(T_INT);
vEntry->setName( token.getValue() );
//std::string varName = token.getValue();
token = scanner->getToken();
st_factor_type(vEntry);
//symTab.insert(varName, vEntry);
}
else if(token == TK_CHAR)
{
#if DEBUG_PARSER
std::cout << "<st> --> char i <st_factor_type>\n";
#endif
token = scanner->getToken();
if(token!=TK_IDENTIFIER) {
errorHandler();
}
if(symTab.search(token)) {
// aready declared in this scope
std::stringstream msg;
msg << "Duplicate variable declaration '" << token.getValue() << "'";
errorHandler(msg.str(), token);
}
VariableEntry* vEntry = new VariableEntry();
vEntry->setType(T_CHAR);
vEntry->setName( token.getValue() );
//std::string varName = token.getValue();
token = scanner->getToken();
st_factor_type(vEntry);
//symTab.insert(varName, vEntry);
}
else
{
errorHandler();
}
if(errorCondition) {
while(token!=TK_EOF) {
token = scanner->getToken();
if(token==TK_RIGHT_BRACE) {
errorCondition=false;
break;
}
if(token==TK_SEMICOLON) {
errorCondition=false;
token = scanner->getToken();
break;
}
}
}
}
/**
* Function representing the <prim_prime> productions
*/
attr RecursiveDescentParser::prim_prime(TableEntry* pTabEntry) {
attr retval;
retval.type = T_ERROR;
if(errorCondition) return retval;
if(token == TK_LEFT_BRACKET)
{
#if DEBUG_PARSER
std::cout << "<prim_prime> --> [<exp>]\n";
#endif
token = scanner->getToken();
retval = exp();
retval.attrib = VA_SIMPLE;
match(TK_RIGHT_BRACKET);
}
else if(token == TK_LEFT_PARENTHESES)
{
#if DEBUG_PARSER
std::cout << "<prim_prime> --> (<o_list>)\n";
#endif
Token sToken = token;
token = scanner->getToken();
ParamList* pList = o_list();
match(TK_RIGHT_PARENTHESES);
if(pTabEntry && pTabEntry->getEntryType()==TableEntry::FUNCTION) {
FunctionEntry* fe = (FunctionEntry*)pTabEntry;
if(pList) {
matchParameters(fe, pList, sToken);
}
retval.type = fe->getReturnType();
retval.addr = symTab.getNextAddress();
iCode.threeAddressCode(TAC_PARAM, pList);
iCode.threeAddressCode(retval, TAC_CALL, fe->getLabel(), fe->getParamCount());
}
else {
std::stringstream errorMsg;
errorMsg << "'" << pTabEntry->getName() << "' is not a function";
errorHandler(errorMsg.str(), sToken);
}
}
else if( token == TK_ASTERISK ||
token == TK_SLASH ||
token == TK_PERCENT ||
token == TK_PLUS ||
token == TK_MINUS ||
token == TK_RIGHT_PARENTHESES ||
token == TK_RIGHT_BRACKET ||
token == TK_SEMICOLON ||
token == TK_LT ||
token == TK_GT ||
token == TK_LTE ||
token == TK_GTE ||
token == TK_EQUAL ||
token == TK_NOT_EQ )
{
#if DEBUG_PARSER
std::cout << "<prim_prime> --> e\n";
#endif
retval = pTabEntry->getAttr();
}
else {
errorHandler();
}
return retval;
}
