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PLC-lang / rusty

Structured Text Parser and LLVM Frontend
GNU Lesser General Public License v3.0
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allow (automatic?) pointer casts as seen in oscat #463

Closed riederm closed 2 years ago

riederm commented 2 years ago

Describe the bug allow assignments between different pointer-types:

e.g. 

VAR
   pt : REF_TO DWORD;
   x : REAL;
END_VAR

pt := &x;   // POINTER TO DWORD := POINTER TO REAL

We should allow the assignment, but at least warn, especially if you use a pointer-type that is bigger than the target: e.g. 

VAR
   pt : REF_TO DWORD;
   x : BYTE;
END_VAR

pt := &x;   // POINTER TO DWORD := POINTER TO BYTE --> this smells bad!

Additional context seen in oscat: e,g, 

FUNCTION TEMP_PT : REAL
create-issue-branch[bot] commented 2 years ago

Branch issue-463-allow_automatic_pointer_casts_as_seen_in_oscat created!