All major SUIF data structures are derived from the suif_object
base class. See section SUIF Objects. The class file_set_entry is
defined in section File Set Entries, the class tree_node and its
derived classes are explained in section Tree Nodes, the class
sym_node and its derived classes are described in section Symbols,
the class type_node and its derived classes are defined in
section Types, the class instruction and its derived classes are
defined in section Instructions and Expression Trees and the class var_def is defined in
section Variable Symbols.