org-babel-current-src-block-location

org-babel-current-src-block-location is a variable defined in `ob-core.el'.
Its value is

nil

Documentation:
Marker pointing to the src block currently being executed.
This may also point to a call line or an inline code block. If
multiple blocks are being executed (e.g., in chained execution
through use of the :var header argument) this marker points to
the outer-most code block.