[LLVMdev] How to get the indices in an getelementptr Value?

[Michael Zolotukhin]

Hi Qiuping,

I guess you need to use getPointerOperand to access the pointer operand (@globalArg in your example) and idx_begin/idx_end iterators to access indexes. You can find a short description of these functions in documentation [1], or look at examples of their uses in the code, e.g. in lib/Transforms/InstCombine/*.cpp.

[1] http://llvm.org/doxygen/classllvm_1_1GetElementPtrInst.html <http://llvm.org/doxygen/classllvm_1_1GetElementPtrInst.html>

Best regards,
Michael

> On Nov 22, 2014, at 12:32 AM, Qiuping Yi <yiqiuping at gmail.com> wrote:
> 
> Hi, all
> 
> I am a LLVM user. I want to get every element in the next instruction:
> 
> %0 = load i32* getelementptr inbounds (%struct.Args* @globalArg, i64 0, i32 2), align 4, !dbg !85, !clap !86
> 
> Now I can only get value "i32* getelementptr inbounds (%struct.Args* @globalArg, i64 0, i32 2)" through "getOperand(0)",
> but I can not get "%struct.Args* @globalArg", "i64 0", and "i32 2" in this instruction.
> 
> I know I can get the indices of getelementptr instructions through "getOperand()", but now in the previous example, 
> I want to get the indices from a getlementptr value. How should I do? Thank you in advance. 
> 
> Best Regards!
> 
> --------------------------------------------
> Qiuping Yi
> Institute Of Software
> Chinese Academy of Sciences
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