XXX is a protected type, a non-tagged record type, and it contains interrupt handlers. It also has a mode of ‘in’ or ‘out’. It may also be an array that does not have the order of its elements. It may also contain a generic subprogram. semantic error 57
XXX contains interrupt handlers
XXX is a nifty piece of code. It contains the aforementioned :m, a nice looking array of numbers, and a number of interrupt handlers. These are all ostensibly implemented in the body of the package. However, XXX has a few limitations. For example, the array of numbers is not constrained, and the number of index expressions is not as high as the number of dimensions of XXX. Also, XXX is not a real type. Consequently, it is not a refinement constituent.
The package XXX also contains a subprogram whose name is a mouthful. Its function is to retrieve the aforementioned :m from a list of names. XXX is also a private type, but a limited one at that. The corresponding private type component is not visible. However, a refined global definition of XXX is required.
The following table gives a brief listing of XXX’s most notable occurrences. The following list is by no means an exhaustive list. However, it should provide a good starting point for your analysis. If the above list is incomplete, consider implementing a more refined version of XXX. This might require some adjustments in the package specification, but you will be rewarded with a much more robust code base. This is not to say that XXX is not useful, but a refactoring of its implementation would be beneficial.
The pragma for this particular pragma is the one whose name appears in the package specification. It has a few parameters, namely external_name, link_name, and external_name. It has a minimum of two and a maximum of four.
XXX is a generic subprogram
XXX is a subprogram declared in a generic package. This subprogram must be declared in the package specification and its definition must be refined. It can have global annotations but XXX is not a type mark. It is only declared as a global subprogram and must be imported into the package.
If a subprogram is declared in an embedded package, it must also have a body stub. This stub is only required in compilation units where the package declares subprograms. XXX is not visible in the package body.
When a subprogram is declared in a package, its global definition must include the refinement constituents of its own variable. These constituents must be visible in the global annotation of its procedure specification. These refinement constituents must be present in both the global annotation of the subprogram and in the initialization clause of the package.
If the subprogram is a function subprogram, the parameters of the function must be mode in. They must also be declared as concrete refinement constituents of the own variable. In this case, the type must match the declaration of the ancestor package. If the type is unconstrained, a semantic error :39 may be issued.
The operator :90 may not be applied to ranges. Operators are defined on types. If the type is a private type, the operator may not be declared in the package. A boolean expression is required in an if statement or in an exit statement. It must be of type boolean and must be valid with the prefix.
XXX is a non-tagged record type
XXX is a limited private type. It is not tagged. It can be declared without constraints. However, a constraint must be associated with the type definition. If you want to declare a record field selector, you cannot use a private type. However, you can declare a scalar record type without a constraint.
If the identifier for the XXX is not a type, the parser reports a syntax error. This is usually associated with a non-existent field or a type that is illegal. Alternatively, it can be associated with an illegal choice in the record aggregate. The stubs for XXX are TERMINAL_A, TERMINAL_B, and TERMINAL_C. In order to make the operator visible, you can rename it. However, you cannot make it visible by negating an enumeration literal.
The pragma Import has a maximum of four parameters. The external name is a package name that can be used to identify the package. There is a convention that pragma Import must have a link_name. This must be used when importing a package that declares its own subprograms. The subprogram must be of mode in. It should also contain a minimum of two parameters. The subprogram type must match the instantiation. If the type is a non-constrained type, it may be defined in another package.
The syntax for SPARK also includes proof contexts. These must be explicitly supplied in case statements. They must also be a valid boolean expression. If you want to use a non-static expression, it must be of the required type and be required in an if statement, while statement, or exit statement.
Arrays may not be ordered
Arrays aren’t necessarily ordered, but they are usually in a sequence of objects that are in order of some kind. This may be accomplished in a number of ways. It may be as simple as making a series of arrays that are ordered by type, or it may be more involved. In order to make a series of ordered arrays, one must create a single array and use the aforementioned ordering operator to place the arrays in order. The trick is in identifying which arrays to place in order.
The most common error is to place the same array in the wrong order. The best way to prevent this is to use a combination of nested arrays that contain each other’s indices. The order of indices is important, because if a nested array is placed in the wrong order, the array will not be ordered and will be treated as a single array. There are some limitations to this scheme. The largest possible array must be constrained to a specific size. This means that if an array is made of thousands of elements, the maximum possible size is limited to thousands of vertices. In some cases, this limitation is more than just a problem; a nested array may be incompatible with an existing array that has not been reconstructed. This is a common problem with unconstrained arrays.
