[LLVMdev] Metadata for Argument, BasicBlock

[Dan Gohman]

On May 7, 2012, at 7:21 AM, Ralf Karrenberg <Chareos at gmx.de> wrote:

> Hi Duncan,
> 
> On 5/6/12 6:12 PM, Duncan Sands wrote:
>> Hi Ralf,
>> 
>>> Is there a clean way to attach metadata nodes to Arguments and/or
>>> BasicBlocks?
>> 
>> not at the moment.  Feel free to work on adding this functionality!
> 
> I am looking into that now.
> I decided to temporarily go for the following syntax for BasicBlock 
> metadata (subject to discussion):
> 
> entry:
>     !property_1 !0, !property_2 !1
>   %x = fadd float %a, %b
> 
> It seems that I have to touch lots of files for this:
> BasicBlock.h/.cpp, Metadata.cpp, LLParser.cpp, AsmParser, AsmWriter, 
> BitcodeReader.cpp, BitcodeWriter.cpp so far.
> I basically went and duplicated code that handles metadata attached to 
> instructions.

What kind of things might basic block metadata be used for?

Dan