[llvm-dev] transfer type to 'local' context

[alex via llvm-dev]

Hi Eli,

indeed, there is no need to use separate contexts for different modules,
my mistake. That solved it for me. Thanks!

> On 8/15/2017 5:48 AM, alex via llvm-dev wrote:
>> Hi all,
>>
>> is there an easy way to get a 'copy' of a type living in another context
>> into the local context?
> 
> No, as far as I know.  (Probably not hard to write, if you really need
> it, though; the LLVM type system is pretty simple.)
> 
>> Background:
>> when calling a function residing in a different module (context2) from a
>> module (context1), we first need to introduce a function declaration of
>> the function with empty body.
>>
>> However, in order to do so, we need the function type.
>> pFuncInContext2->getType gives us the type in context2.
>> The returnType or argument type might refer to some types yet only
>> defined in context2 (e.g. special structs).
>>
>> In order to get the functin declaration right, I would need to find out
>> if we have in context 1every necessary type referred to by the function
>> (in context2) and introduce it if not.
>>
>> Is there an elegant way wrapping all this?
>> E.G. getTypeinLocalcontext(context1, pFuncTypeInContext2)?
> 
> Why are your modules in different contexts?  IR linking normally
> involves loading all of the relevant modules into the same context.
> 
> -Eli
>