[llvm-dev] How to get the arguments of a function call in LLVM? (original) (raw)

Tim Northover via llvm-dev llvm-dev at lists.llvm.org
Wed Apr 19 09:28:03 PDT 2017

On 19 April 2017 at 09:05, Dipanjan Das via llvm-dev <llvm-dev at lists.llvm.org> wrote:

If I run the pass through opt, it produces the following

malloc : 0x3df3f40 i64 %0 What does 0x3df3f40 represent?

getArgOperand returns a pointer to a Value object. You're printing that pointer directly rather than calling its print method to get a sensible representation.

Instead of 164 and 512, why does it produce i64 and %0?

That's because you're iterating through the argument as it exists at the function's definition/declaration rather than the callsite. You should be using the CallInst's accessors rather than the Function's if you want the arguments used for this particular call.

Cheers.

Tim.

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