llvm dev - Apr 2021 - Add callee list in the llvm IR

Hello All,

I have a requirement to list all the function callee's as an entry in
the llvm IR, so that one of the llvm pass can use them and do certain
optimizations.

ex:
abc()
{
   ...
   a();
   b();
}

IR:
define void @_Z23_abc() #0 !dbg !5503 !Callee_list !5504 {
 ...
!5504 = !{!"a,b"}

I tried looking into SemaDeclCXX.cpp but all I was getting in the
definition data.
Can someone point out how we can do this?

Thanks in advance
Nagaraju

Just sketching and I haven't tried any of this, but if understand things
correctly, then something along the lines of this would be the idea?

  for (Function &F : Module) {
    if (!F.isDeclaration())
      continue;
    for (auto *U : F.users()) {
      if (!isa<CallInst>(U)
        continue;
      U->dump();
    }
  }
________________________________
From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Nagaraju
Mekala via llvm-dev <llvm-dev at lists.llvm.org>
Sent: 27 April 2021 12:25
To: LLVM Developers Mailing List <llvm-dev at lists.llvm.org>
Subject: [llvm-dev] Add callee list in the llvm IR

Hello All,

I have a requirement to list all the function callee's as an entry in
the llvm IR, so that one of the llvm pass can use them and do certain
optimizations.

ex:
abc()
{
   ...
   a();
   b();
}

IR:
define void @_Z23_abc() #0 !dbg !5503 !Callee_list !5504 {
 ...
!5504 = !{!"a,b"}

I tried looking into SemaDeclCXX.cpp but all I was getting in the
definition data.
Can someone point out how we can do this?

Thanks in advance
Nagaraju
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