llvm dev - Feb 2012 - [LLVMdev] Difficulty inserting putchar in IR

Hi,

I have written a simple code to  insert putchar() function into IR.
It compiled well but when  I tried to run the generated .bc file with lli,
its not showing
proper output.

Function *putchar_func = cast<Function>(M->
    getOrInsertFunction("putchar", IntegerType::getInt32Ty(Context),
                        IntegerType::getInt32Ty(Context), NULL));

  Value *One = ConstantInt::get(Type::getInt32Ty(Context), 1);

  CallInst *CallFibX1 = CallInst::Create(putchar_func, One, "fibx1",
BB);
  CallFibX1->setTailCall();



Thanks and Regards,
Tarun Agrawal
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On 2/9/12 1:02 PM, tarun agrawal wrote:
> Hi,
>
> I have written a simple code to  insert putchar() function into IR.
> It compiled well but when  I tried to run the generated .bc file with 
> lli, its not showing
> proper output.
>
> Function *putchar_func = cast<Function>(M->
>     getOrInsertFunction("putchar",
IntegerType::getInt32Ty(Context),
>                         IntegerType::getInt32Ty(Context), NULL));
>
>   Value *One = ConstantInt::get(Type::getInt32Ty(Context), 1);
>
>   CallInst *CallFibX1 = CallInst::Create(putchar_func, One,
"fibx1", BB);
>   CallFibX1->setTailCall();
I'm assuming the program runs through lli but is not showing any output.

I think you're calling putchar() with a value of 1.  That may be an 
unprintable character (like ctrl-a).  Try a value that is an ASCII 
character (I think 'A' is 65, but it's been awhile).

-- John T.
>
>
>
> Thanks and Regards,
> Tarun Agrawal
>
>
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