Fortran common blocks are represented in SUIF by global group
types. These can be accessed just like any other structures. In
addition, and the Fortran front-end will create sub-variables to
represent the fields in the common block, so most of the time
only the sub-variables themselves will be seen. If you want to know
whether a particular global group represents a common block,
you can check for the k_common_block annotation, which is put
only on variables representing common blocks (the blocks, not
the fields).