void n_case::code_gen(status& stat, std::ostream& out)
{
if (left != NULL) // case:
{
stat.lock_register(out);
stat.set_assign_expr();
int op2 = stat.get_register();
left->code_gen(stat, out);
stat.unlock_register(out);
stat.set_assign_expr();
std::string next_case_label = stat.label_gen();
// if the expressions are not equal, branch over statement
out << "\tbne\t$t" << stat.get_register() << ",$t" << op2 << "," << next_case_label << "\n";
out << "\tnop\n";
// case body label
if (stat.get_case_label() != "empty")
out << stat.get_case_label() << ":\n";
stat.set_case_label();
if (right != NULL)
right->code_gen(stat, out); // case body
// fall through: need to jump to the next case body.
out << "\tb\t" << stat.get_case_label() << "\n";
out << "\tnop\n";
out << next_case_label << ":\n";
}
else // default:
{
if (right != NULL)
right->code_gen(stat, out);
}
return;
}
void n_switch::code_gen(status& stat, std::ostream& out)
{
stat.lock_register(out);
stat.set_assign_expr();
// check expression
left->code_gen(stat, out);
stat.set_assign_expr();
stat.set_break_label();
// list of cases
right->code_gen(stat, out);
stat.unlock_register(out);
out << stat.get_break_label() << ":\n";
out << stat.get_case_label() << ":\n";
stat.reset_labels(false);
return;
}
