INTEGERs

INTEGER ranges cannot be open: for example, as members in a SEQUENCE, ...

        value INTEGER

... or ...

        value INTEGER (0..MAX)

are not allowed, since MAX can have ASN.1 tool-specific semantics. To that end, the only INTEGER statements allowed are the ones with explicit ranges declared, i.e.

        value INTEGER (123..789)

This is also necessary for another reason: the code generated for INTEGERs by an ASN.1 compiler (in our case, asn1Scc^9.1) is able to carry specific ranges of INTEGERs. In our case, the target C type is long. Depending on the implementation platform, long can carry anywhere from 32 to 128 bits; the Data Modeling Toolchain knowns the target platform, and can therefore check whether the range specified in the ASN.1 grammar is covered. If it is not, a fatal error will be displayed during the translation, ...

        INTEGER (in ...) must have a range constraint inside 
        ASN.1, or else we might lose accuracy during runtime!

... safeguarding the system from undefined runtime behavior which would occur if an attempt to store a value larger than long is made somewhere during the modeling process.

This error can be disabled by passing -ignoreINTEGERranges to the code generator.