[cfe-dev] [Analyzer] How to register a trait for a custom data structure?

[Artem Dergachev via cfe-dev]

Mmm, yep, looks annoying. Defining ProgramStatePartialTrait for your 
structure isn't hard (there are a lot of examples in 
ProgramStateTrait.h) but it essentially requires your structure to be 
representable as a void*. Which means that you anyway have to make a 
manager/factory object to allocate your structures on the heap and 
manage memory. And at this point you no longer need to specialize 
ProgramStatePartialTrait because you might as well put a raw pointer 
into the trait.

This whole facility was designed in order to encapsulate the knowledge 
about what does the trait actually mean within the checker. Ironically, 
these days we believe that such encapsulation is more harmful than 
useful, but we didn't get rid of it yet.

Also you can make multiple traits: one for each field of your structure. 
This isn't very object-oriented, but will do the trick as long as all 
you need to do is to store a multiple items. You can also make a 
getter/setter function to assemble your structure from multiple traits 
and disassemble it back into traits.


On 6/21/19 5:42 PM, Torry Chen via cfe-dev wrote:
> I'm writing a checker and would like to associate program states with 
> a custom data structure, e.g. "struct MyData {...}". When trying 
> REGISTER_TRAIT_WITH_PROGRAMSTATE it doesn't seem to support custom 
> data types. It's a single value so I don't want to use LIST or SET.
>
> Are there other simple ways to register a single compound value with 
> program state?
>
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> cfe-dev at lists.llvm.org
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