Constants - FunctionBlock instances cannot be declared in CONSTANT blocks #295
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riederm
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Sep 26, 2021
fb-instances and class-instances cannot be declared as constants. the implementation does not allow to declare a const of type FB or Class, an array of FBs or Classes or a struct that contains a field of type FB or Class. Furthermore the DataTypeInformation::Struct now contains a new field: 'source' that indicates where this struct comes from. It is either an original Declaration (TYPE x : STRUCT ... END_TYPE) or it was generated from a POU(PouType). With this field it is now very easy to see what a DataType offers (is it an FB or Class, can I call it, etc.) closes #295
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Sep 27, 2021
…ressions #292) (#306) * validate illegal fb and class consts fb-instances and class-instances cannot be declared as constants. the implementation does not allow to declare a const of type FB or Class, an array of FBs or Classes or a struct that contains a field of type FB or Class. Furthermore the DataTypeInformation::Struct now contains a new field: 'source' that indicates where this struct comes from. It is either an original Declaration (TYPE x : STRUCT ... END_TYPE) or it was generated from a POU(PouType). With this field it is now very easy to see what a DataType offers (is it an FB or Class, can I call it, etc.) closes #295 * add scope to unresolved const expressions the additional scope parameter in const_evaluator::evaluate(...) helps the evaluator to distinguish between global constants and POU-local ones. When resolving const expressions the given scope will be used to resolve references. therefore every ConstExpression holds an optional scope when it is registered (see enum ConstExpression). closes #292
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see chapter 6.5.2.1 of the norm
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