public void push(final T operand) {
    final int nextTop = top + 1;
    if (nextTop == maxSize) {
      throw new OverflowException();
    }
    entries[nextTop] = operand;
    top = nextTop;
  }
Push operand.

@param operand the operand
evm/src/main/java/org/hyperledger/besu/evm/internal/FixedStack.java