llvm dev - Jun 2007 - [LLVMdev] Way to know which tool was used

Hello, LLVM devers.
I just wonder if it is possible to know which tool was used in a scope.

For example,
If I want to have LLVM assembly, it is simply done with 'llvm-dis
xx.bc'.
But I wonder if it is possible to know explicitly 'llvm-dis' was used
during printing out LLVM assembly in AssemblyWriter.

Thanks,
Seung J. Lee