llvm dev - Jun 2013 - [LLVMdev] Accessing slot numbers of unnamed instructions (SlotTracker)

Hey everyone,

I'm currently trying to figure out a method for providing a unique 
identification of an llvm::Instruction that is consistent with the output of an 
AssemblyWriter. Obviously this is easy for named instructions: In this case 
the identification is the name itself, but I'd like to have the same thing
for
unnamed instructions.

If I understand the code in AssemblyWriter.cpp correctly, AssemblyWriter uses 
SlotTracker to keep track of the numbers used for unnamed instructions. 
Unfortunately for me SlotTracker is missing from LLVM's public header files.
Is
there any other way to retrieve a slot number for an Instruction that is 
consistent with the numbers assigned by an existing AssemblyWriter instance.

Best regards,
 Florian Merz

-- 
Karlsruhe Institute of Technology (KIT)
Institute for Theoretical Computer Science

Dipl.-Inform. Florian Merz
Researcher

Am Fasanengarten 5
Building 50.34
76131 Karlsruhe, Germany

Phone: +49 721 608-45955
Fax: +49 721 608-44211
Email: florian.merz at kit.edu
Web: http://verialg.iti.kit.edu/ 

KIT - University of the State of Baden-Wuerttemberg and
National Research Center of the Helmholtz Association

Hi Florian,
> I'm currently trying to figure out a method for providing a unique
> identification of an llvm::Instruction that is consistent with the output
of an
> AssemblyWriter. Obviously this is easy for named instructions: In this case
> the identification is the name itself, but I'd like to have the same
thing for
> unnamed instructions.
>
> If I understand the code in AssemblyWriter.cpp correctly, AssemblyWriter
uses
> SlotTracker to keep track of the numbers used for unnamed instructions.
> Unfortunately for me SlotTracker is missing from LLVM's public header
files. Is
> there any other way to retrieve a slot number for an Instruction that is
> consistent with the numbers assigned by an existing AssemblyWriter
instance.
why do you want this?  The short answer is that these numbers are only available
in the AssemblyWriter, so you would either have to duplicate the logic that it
uses, or put some kind of hook in AssemblyWriter.

Ciao, Duncan.