[LLVMdev] common type at compile time?

ret val retval386 at gmail.com
Thu Oct 20 09:34:16 PDT 2011

I'm a bit confused. For the Type did you mean something like:
        ArrayType *type = ArrayType::get(Type::getInt8PtrTy(M.getContext()), 4);
This does not work, it gives me ""Wrong type in array element
initializer" at runtime.

Also it doesn't look like ConstantExpr inherits ConstantArray, so I'm
not sure how I could use this instead.


On Thu, Oct 20, 2011 at 12:04 PM, John Criswell <criswell at illinois.edu> wrote:
> On 10/20/11 10:43 AM, ret val wrote:
>> I'm trying to create a ConstantArray(whose contents will be of types
>> Function*, GlobalVariable *) so I can immediately create a new
>> GlobalVariable(that will be in its own section). I'm doing this so I
>> have these address stored. In order to create this ConstantArray I
>> need a valid ArrayType, but I'm not sure what to use for the element
>> type.
>> I want this to be done at compile time, so I cant use a BitCastInst to
>> make them all generic pointers. What else can I do?
> You can use a ConstantExpr (constant expression) for Function  and
> GlobalVariable objects.  The ArrayType can be an array of pointers to 8-byte
> characters (basically a void pointer type).
> -- John T.
>> In other words
>> * I built up a vector id like to eventually store as a GlobalVariable
>> array: vector<Constant *>  v_elements;
>> * Turned it into something for the ConstantArray::get can use:
>> ArrayRef<Constant *>  a_elements(v_elements);
>> * And now I need to come up with the ArrayType arg for the
>> ConstantArray::get() method where I only know: ArrayType::get(???, 4);
>> Thanks
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