[llvm-dev] How to get return address at llvm ir level?

[Zhang via llvm-dev]

Judging from the documentation, I'd say yes.
You can use intrinsics by importing them first using Intrinsics::getType and Intrinsics::lookupLLVMIntrinsicsByName I think. Then just call them like any other function. You might need to take special care with inline attributes and whatnot though


Zhang
 
------------------ Original ------------------
From:  "PenYiWang via llvm-dev"<llvm-dev at lists.llvm.org>;
Date:  Wed, Sep 5, 2018 10:16 AM
To:  "llvm-dev"<llvm-dev at lists.llvm.org>; 

Subject:  [llvm-dev] How to get return address at llvm ir level?

 
Hi

I want to write a FunctionPass to insert some code before return.


Funcion:
..
..
..
mov eax,[esp]
cmp eax,0x12345678
je 0x12345678
ret
(maybe stack will not balance)


I wonder that can I get the return address at llvm ir level?


I use IRBuilder to CreateICmpEQ and CreateCondBr.


but I don't how to get the value of return addrss.


I have found there is a  Intrinsic::returnaddress.



Is Intrinsic::returnaddress can help me?


I don't konw how to use Intrinsic::returnaddress because few files use this intrinsic.


Thanks
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