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

[Craig Topper via llvm-dev]

I think you need to get the arguments from the CallInst, not func. func is
getting the arguments from the function defintion. If you want the
arguments from the call site you want them from CallInst.
~Craig


On Thu, Jan 16, 2020 at 10:12 AM Abid Malik via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
>
> I am using the following to capture the values of the arguments in a call
> function:
>
>         for (auto &BB : F) {
>                 for (auto &II : BB) {
>                 if (CallInst *c = dyn_cast <CallInst> (&II)){
>                                 if ( Function *func =
> c->getCalledFunction()){
>                                         if ( func->getName()
> =="__kmpc_for_static_init_4" ||
>                                           func->getName() ==
> "__kmpc_for_static_fini" )
>                                         {
>                                                 errs() << func->getName();
>                                                 errs() << "\n";
>                                                 for(auto arg =
> func->arg_begin(); arg != func->arg_end(); ++arg) {
>                                                         errs() << *arg <<
> "\n";
>                                                 if(auto* ci =
> dyn_cast<ConstantInt>(arg))
>                                                         errs() <<
> ci->getValue() << "\n";
>                                                         }
>                                                 }
>                                         }
>                                 }
>                         }
>                 }
>
> I am looking for two specific calls for OMP in the *.ll file. For the
> following:
>
> call void @__kmpc_for_static_init_4(%struct.ident_t* @0, i32 %17, i32 34,
> i32* %8, i32* %5, i32* %6, i32* %7, i32 1, i32 1)
>
> I am able to see it and get the following:
> __kmpc_for_static_init_4
> %struct.ident_t* %0
> i32 %1
> i32 %2
> i32* %3
> i32* %4
> i32* %5
> i32* %6
> i32 %7
> i32 %8
> The three arguments ( third ( schedule) and the last two; loop increment
> and chunk size are constant). The innermost loop should get them but it
> seems the test command fails on these three arguments. Also, the argument
> variable are different from the actual variable from the *.ll file.
>
> Any comments.
>
> Thanks,
>
> --
> Abid M. Malik
> ******************************************************
>
>
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