llvm dev - Jan 2020 - error: incomplete type 'llvm::CallInst' named in nested name specifier

Hello,

I am trying to write a pass. Here is a short and simplified version of it
bool MyPass:: runOnFunction( Function &F){
        errs() << "Visiting function " << F.getName();
        errs() << "\n";

        for (auto &BB : F) {
                for (auto &II : BB) {
                        if (CallInst *c = dyn_cast <CallInst> (&II)){

                        }
                }
        }
        return false; // We did not change anything in the IR
}

The code is straight forward and very much in line with the examples LLVM
pass on the web.

However, when I compile it, I am getting the following error.

In file included from MyPass.cpp:1:
In file included from
/home/amalik/LLVM/llvm-8.0.0.src/include/llvm/Pass.h:365:
In file included from
/home/amalik/LLVM/llvm_install/include/llvm/PassSupport.h:26:
In file included from
/home/amalik/LLVM/llvm_install/include/llvm/PassRegistry.h:23:
In file included from
/home/amalik/LLVM/llvm_install/include/llvm/Support/CBindingWrapping.h:18:
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:59:12: error:
incomplete type 'llvm::CallInst' named in nested name
      specifier
    return To::classof(&Val);
           ^~~~
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:107:32: note:
in instantiation of member function
      'llvm::isa_impl<llvm::CallInst, llvm::Instruction,
void>::doit'
requested here
    return isa_impl<To, From>::doit(*Val);
                               ^
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:133:36: note:
in instantiation of member function
      'llvm::isa_impl_cl<llvm::CallInst, const llvm::Instruction
*>::doit'
requested here
    return isa_impl_cl<To,FromTy>::doit(Val);
                                   ^
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:124:56: note:
in instantiation of member function
      'llvm::isa_impl_wrap<llvm::CallInst, const llvm::Instruction *,
const
llvm::Instruction *>::doit' requested here
      typename simplify_type<SimpleFrom>::SimpleType>::doit(
                                                       ^
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:144:70: note:
in instantiation of member function
      'llvm::isa_impl_wrap<llvm::CallInst, llvm::Instruction *const,
const
llvm::Instruction *>::doit' requested here
                       typename simplify_type<const
Y>::SimpleType>::doit(Val);
                                                                     ^
/home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:334:10: note:
in instantiation of function template specialization
      'llvm::isa<llvm::CallInst, llvm::Instruction *>' requested
here
  return isa<X>(Val) ? cast<X>(Val) : nullptr;
         ^
DummyPass.cpp:30:21: note: in instantiation of function template
specialization 'llvm::dyn_cast<llvm::CallInst, llvm::Instruction>'
      requested here
                if (CallInst *c = dyn_cast <CallInst> (&II)){
                                  ^
/home/amalik/LLVM/llvm_install/include/llvm/IR/BasicBlock.h:35:7: note:
forward declaration of 'llvm::CallInst'
class CallInst;
      ^
1 error generated

------>

Thanks,

-- 
Abid M. Malik
******************************************************
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On Tue, 14 Jan 2020 at 19:22, Abid Malik via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> However, when I compile it, I am getting the following error.
>
> /home/amalik/LLVM/llvm_install/include/llvm/Support/Casting.h:59:12: error:
incomplete type 'llvm::CallInst' named in nested name
>    [...]                          ^
> /home/amalik/LLVM/llvm_install/include/llvm/IR/BasicBlock.h:35:7: note:
forward declaration of 'llvm::CallInst'
> class CallInst;
Looks like you forgot to include the header that defined CallInst. You
need that to be able to do most things with it, including (as you've
discovered) an RTTI-based cast. In this case the header is
"llvm/IR/Instructions.h".

Cheers.

Tim.