@Override
void evaluate(Instruction ins) {
Expression rhs = evalMachine.pop();
Expression lhs = evalMachine.pop();
RelationalOperator op = RelationalOperator.EQ;
switch (ins.opcode) {
case OPCODE_IF_ICMPEQ:
case OPCODE_IF_ACMPEQ:
op = RelationalOperator.EQ;
break;