Object express2 = calcstack.pop();
if (express2 instanceof MathExpressionOperatorRef) {
MathExpressionOperatorRef operator = (MathExpressionOperatorRef) express2;
Class op2Class = getExpressionClass(express1);
MathOperatorBinary opcode = (MathOperatorBinary) operator.getRef();
eax = opcode.checkAvailiable(eax, op2Class);
} else {
MathExpressionOperatorRef operator = (MathExpressionOperatorRef) calcstack.pop();
Class op1Class = getExpressionClass(express1);
Class op2Class = getExpressionClass(express2);
MathOperatorBinary opcode = (MathOperatorBinary) operator.getRef();