llvm dev - Dec 2012 - [LLVMdev] issue writing llvm metadata

Hi,


 I am looking to write customized metadata to a particular load instruction
using LLVM transform pass (A function pass to be specific). I have the following
code snippet.


			
>  Value *CI = ConstantInt::get(getGlobalContext(), APInt(8,2));
>   ArrayRef<Value*> temp = ArrayRef<Value*>( CI);
>   MDNode *Node = MDNode::get(load->getContext(), temp);			
>  load->setMetadata("mydata",Node);

On running the pass with my input_file, I could not find the new metadata node
in the .o file when i run llvm-dis with it . What am I missing ? Please help me
out!

I run the pass as 

opt -load path_to_my_library.so -pass_name < input_file.o > /dev/null

Should I do something different for a transform pass to work? 

Thank you!


regards,
Ashwin

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Hi Ashwin,
> I run the pass as
>
> *opt -load path_to_my_library.so -pass_name < input_file.o >
/dev/null*
maybe write your output to a file rather than throwing it away?

Ciao, Duncan.