[LLVMdev] get the value of a Constant in LLVM IR

[John Criswell]

On 10/17/13 8:42 AM, Eirini Psallida wrote:
> Hello,
> i parse the llvm IR (llvm-3.3 version) and when i meet a constant, i 
> want to get it's value.
> eg i32 5,   i want to get the 5.
> I am interested in ConstantInt-ConstantFP-ConstantArray-ConstantStruct 
> subclasses.
> Things are a bit easier with ConstantInt and ConstantFP constants but how
> could i get the value of a ConstantArray?
> The 
> http://llvm.org/docs/ProgrammersManual.html#the-constant-class-and-subclasses 
>
> says:
> ConstantArray : This represents a constant array.

ConstantArray is a subclass of Constant.  Constant, in turn, has a 
method called getAggregateElement() that will return the Constant * 
value at the specified offset within the aggregate constant (be it an 
array, vector, etc.).

For more information, consult the Constant class doxygen page:

http://llvm.org/doxygen/classllvm_1_1Constant.html

-- John T.

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