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3.11 Declarative Parts

  1. A declarative_part contains declarative_items (possibly none).

    Syntax 

  2. declarative_part ::= {declarative_item}

  3. declarative_item ::= basic_declarative_item | body

  4. basic_declarative_item ::=
   basic_declaration | representation_clause | use_clause

  5. body ::= proper_body | body_stub

  6. proper_body ::=
   subprogram_body | package_body | task_body | protected_body

    Dynamic Semantics

  7. The elaboration of a declarative_part consists of the elaboration of the declarative_items, if any, in the order in which they are given in the declarative_part.
  8. An elaborable construct is in the elaborated state after the normal completion of its elaboration. Prior to that, it is not yet elaborated.
  9. For a construct that attempts to use a body, a check (Elaboration_Check) is performed, as follows:
    1. For a call to a (non-protected) subprogram that has an explicit body, a check is made that the subprogram_body is already elaborated. This check and the evaluations of any actual parameters of the call are done in an arbitrary order.
    2. For a call to a protected operation of a protected type (that has a body -- no check is performed if a pragma Import applies to the protected type), a check is made that the protected_body is already elaborated. This check and the evaluations of any actual parameters of the call are done in an arbitrary order.
    3. For the activation of a task, a check is made by the activator that the task_body is already elaborated. If two or more tasks are being activated together, See section 9.2 Task Execution - Task Activation, as the result of the elaboration of a declarative_part or the initialization for the object created by an allocator, this check is done for all of them before activating any of them.
    4. For the instantiation of a generic unit that has a body, a check is made that this body is already elaborated. This check and the evaluation of any explicit_generic_actual_parameters of the instantiation are done in an arbitrary order.

  1. The exception Program_Error is raised if any of these checks fails.

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