llvm dev - Aug 2014 - [LLVMdev] Inserting Calls to var args Functions

Hi All,

I am using code similar to giri instrumentation
<https://github.com/liuml07/giri> framework to insert my instrumentation
code. It works for normal functions for example to insert recordInt32
function below.

void recordInt32(int32_t val){
printf("%d, ", val);
}

I can get recodedInt32 function in my Module using  getOrInsert Function.

Function* RecordInt32 =
cast<Function>(M.getOrInsertFunction("recordInt32",
                                              VoidType,
                                              Int32Type,
                                              NULL));

and insert at desired instPoint using:

CallInst::Create(RecordInt32, args, "", instPoint);

What should be the similar instructions for recoedVarInsputValues below:

void recordVarInputValues(int num, ...){ CODE }

I am not able to figure out what will be the argument to
getOrInsertFunction for "...".

Thanks!
Manish
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Dear Manish,

For a varargs function, I think you'll need to use the version of 
Module::getOrInsertFunction() that takes a FunctionType.  That 
FunctionType, in turn, can be created so that is has a vararg type (see 
http://llvm.org/doxygen/classllvm_1_1FunctionType.html#ab781285a21baf484d3023a63da798fc7).

Regards,

John Criswell

On 8/31/14, 4:29 PM, Manish Gupta wrote:
> Hi All,
>
> I am using code similar to giri instrumentation 
> <https://github.com/liuml07/giri> framework to insert my 
> instrumentation code. It works for normal functions for example to 
> insert recordInt32 function below.
>
> void recordInt32(int32_t val){
> printf("%d, ", val);
> }
>
> I can get recodedInt32 function in my Module using  getOrInsert Function.
>
> Function* RecordInt32 = 
> cast<Function>(M.getOrInsertFunction("recordInt32",
>                                               VoidType,
>                                               Int32Type,
>                                               NULL));
>
> and insert at desired instPoint using:
>
> CallInst::Create(RecordInt32, args, "", instPoint);
>
> What should be the similar instructions for recoedVarInsputValues below:
>
> void recordVarInputValues(int num, ...){ CODE }
>
> I am not able to figure out what will be the argument to 
> getOrInsertFunction for "...".
>
> Thanks!
> Manish
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Thanks!

---------
FunctionType *FuncTy = FunctionType::get(VoidType, args, true);
 RecordVarArgs
cast<Function>(M.getOrInsertFunction("recordVarInputValues",
                                                        FuncTy));


On Sun, Aug 31, 2014 at 2:09 PM, John Criswell <criswell at illinois.edu>
wrote:
>  Dear Manish,
>
> For a varargs function, I think you'll need to use the version of
> Module::getOrInsertFunction() that takes a FunctionType.  That
> FunctionType, in turn, can be created so that is has a vararg type (see
>
http://llvm.org/doxygen/classllvm_1_1FunctionType.html#ab781285a21baf484d3023a63da798fc7
> ).
>
> Regards,
>
> John Criswell
>
>
> On 8/31/14, 4:29 PM, Manish Gupta wrote:
>
> Hi All,
>
>  I am using code similar to giri instrumentation
> <https://github.com/liuml07/giri> framework to insert my
instrumentation
> code. It works for normal functions for example to insert recordInt32
> function below.
>
>  void recordInt32(int32_t val){
>  printf("%d, ", val);
> }
>
>  I can get recodedInt32 function in my Module using  getOrInsert
> Function.
>
>  Function* RecordInt32 >
cast<Function>(M.getOrInsertFunction("recordInt32",
>                                               VoidType,
>                                               Int32Type,
>                                               NULL));
>
>  and insert at desired instPoint using:
>
>  CallInst::Create(RecordInt32, args, "", instPoint);
>
>  What should be the similar instructions for recoedVarInsputValues below:
>
>  void recordVarInputValues(int num, ...){ CODE }
>
>  I am not able to figure out what will be the argument to
> getOrInsertFunction for "...".
>
>  Thanks!
> Manish
>
>
> _______________________________________________
> LLVM Developers mailing listLLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
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