llvm dev - Jul 2018 - Accessing global variable values from IRBuilder

I'm trying to do something with a global variable value with IRBuilder in
LLVM pass. I refer to a specific global variable contained in a source
file.

  GlobalVariable *VarTest     new GlobalVariable(M, PointerType::get(Int32Ty,
0), false,
                       GlobalValue::ExternalLinkage, 0, "vartest");

Then, I pass that variable to a runtime function with CreateCall.

However, I can't seem to access any variables from the source code. I get
"undefined reference to 'vartest.5'" when attempting the pass.
Why is it
adding a '.5' to my variable name?

How do I access a global variable from the target source?
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It seems like you are creating a new global variable, you may need to look into
Module->getGlobalVariable(..) function.

- Ashutosh

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Jacob
Ajit via llvm-dev
Sent: Thursday, July 5, 2018 11:35 PM
To: llvm-dev at lists.llvm.org
Subject: [llvm-dev] Accessing global variable values from IRBuilder

I'm trying to do something with a global variable value with IRBuilder in
LLVM pass. I refer to a specific global variable contained in a source file.

  GlobalVariable *VarTest     new GlobalVariable(M, PointerType::get(Int32Ty,
0), false,
                       GlobalValue::ExternalLinkage, 0, "vartest");

Then, I pass that variable to a runtime function with CreateCall.

However, I can't seem to access any variables from the source code. I get
"undefined reference to 'vartest.5'" when attempting the pass.
Why is it adding a '.5' to my variable name?

How do I access a global variable from the target source?

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