SA0019: Implicit pointer conversions

Detects implicitly generated pointer conversions

Justification: In CODESYS, pointers are not strictly typed and they can be assigned to each other in any way. This is often used and therefore not reported by the compiler. However, it can also accidentally cause unexpected access. If you assign a ‎POINTER TO BYTE‎ to a ‎POINTER TO DWORD‎, then you can unintentionally overwrite memory using the latter pointer. Therefore, always check this rule and block the message for cases in which you intentionally want to access a value with a different type.

Implicit data type conversions are reported with a different message.

Importance: High

PLCopen rule: CP25

Exception: ‎BOOL‎ <-> ‎BIT‎

Example

PROGRAM PLC_PRG
VAR
	pINT : POINTER TO INT;
	byteVar : BYTE;
END_VAR

pINT := ADR(byteVar);

--> SA0019: Implicit conversion from pointer to 'POINTER TO BYTE' to pointer to 'POINTER TO INT'