[LLVMdev] Adding fields in a already built type? (2)

Chris Lattner clattner at apple.com
Tue Jun 15 14:05:10 PDT 2010


On Jun 15, 2010, at 12:45 PM, St├ęphane Letz wrote:
>>> 
>>> Is that even possible?
>> 
>> It would work, but sounds really inefficient.  What are you really trying to do here?
>> 
>> -Chris
> 
> 
> inefficient : do you mean because all users of the refined type would have to be "notified" ?

Yes.

> The reason is that our code generator generates a struct (progressively adding fields) and generates code that access this struct (that is : the fields that are already added). If we cannot create the struct progressively, then we have to define a pass to build the complete struct, then define a second pass to generate the code. If we can simply create the struct progressively at LLVM level, then it make our code simpler.

LLVM doesn't support this sort of thing.  Is two passes really that bad?

-Chris



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