[LLVMdev] static constant structs

[Michael Welsh Duggan]

Duncan Sands <baldrick at free.fr> writes:

>> I hope this is the correct forum in which to ask this question.
>>
>> Currently I am writing code meant to compile with LLVM 3.0.  I am trying
>> to figure out, using the C++ API, how to create a constant static
>> struct, or the equivalent.  Since I am copying data from existing C
>> structs, I am currently I am using a ConstantArray global variable, and
>> then pointer casting it to the appropriate type when I use it, but this
>> seems overly clunky.
>>
>>      Constant *cip = ConstantArray::get(
>>          ctx(), StringRef((char *)&addr_, sizeof(addr_)), false);
>>      return new GlobalVariable(
>>          *mod(), cip->getType(), true,
>>          GlobalVariable::PrivateLinkage, cip);
>>
>> In a previous version of my code, I replaced cip->getType() with the
>> llvm equivalent of the type of addr_.  This worked until I tried with a
>> build of llvm that had assertions turned on.  Even without that, I am
>> hoping there is a better way to do this that I have managed to overlook.
>>
>
> I'm not sure I understood your question, but it sounds like you may
> want to call this ConstantArray method (with AddNull = false).

Um...  That's exactly what the example above demonstrates.  But maybe I
did not explain my problem well enough.  If I have a type like, for
example:

{ i32, [ 4 x i8 ] }

How can I create a constant of this type like this:

{ i32 0x1ffff, [ i8 0, i8 4, i8 10, i8 8 ] }

from the C++ API without going through nasty pointer cast tricks?

-- 
Michael Welsh Duggan
(md5i at md5i.com)