In the declarative part, the user declares his partitions and can change their default behavior. po_gnatdist provides a predefined type Partition. The user can declare a list of partitions and can also initialize these partitions with an initial list of Ada units.
DECLARATIVE_PART ::= {DECLARATIVE_ITEM}
DECLARATIVE_ITEM ::=
PARTITION_DECLARATION
| CHANNEL_DECLARATION
| REPRESENTATION_CLAUSE
| SUBPROGRAM_DECLARATION
| PRAGMA
SUBPROGRAM_DECLARATION ::=
MAIN_PROCEDURE_DECLARATION
| PROCEDURE_DECLARATION
| FUNCTION_DECLARATION
PARTITION_DECLARATION ::=
DEFINING_IDENTIFIER_LIST : Partition
[:= ENUMERATION_OF_ADA_UNITS];
DEFINING_IDENTIFIER_LIST ::=
DEFINING_IDENTIFIER {, DEFINING_IDENTIFIER}
STATEMENT ::=
IDENTIFIER := ENUMERATION_OF_ADA_UNITS;
SEQUENCE_OF_STATEMENTS ::=
STATEMENT {STATEMENT}
Once declared, a partition is an empty list of Ada units. The operator ":=" adds the Ada units list on the right side to the current list of Ada units that are already mapped to the partition. This is a non-destructive operation. Whether a unit is a relevant Ada unit or not is checked later on by the back-end of po_gnatdist. These assignments can occur in the declarative part as well as in the body part.
ENUMERATION_OF_ADA_UNITS ::= ({ADA_UNIT {, ADA_UNIT}});