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? 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
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 > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> 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?Use a bitcast ConstantExpr. Ciao, Duncan.
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.
Thanks
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
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>