[llvm-dev] RFC: metadata attachments for global variables

[Philip Reames via llvm-dev]

+1.  I've seen a couple of cases where metadata on a global would be 
useful as an optimization hint as well.

Philip

On 05/06/2016 01:17 PM, Peter Collingbourne via llvm-dev wrote:
> Hi all,
>
> I'd like to add support for metadata attachments for global variables 
> in the same way as we did for functions.
>
> Syntax would be pretty simple:
> @foo = global i32 0, !foo !0, !bar !1
> (the extra commas are required to disambiguate from a named metadata 
> on the next line)
>
> Benefits:
> 1) Lets us reverse the DIGlobalVariable -> GlobalVariable edge, which 
> should hopefully clear the way for removing the llvm.dbg.cu 
> <http://llvm.dbg.cu> named metadata node.
>
> 2) Allows for bitset metadata to be attached to globals rather than 
> being represented as a named metadata node. This means that bitset 
> metadata is naturally dropped when globals are dropped, and makes it 
> easier to manipulate bitset metadata and build summaries of bitset 
> definitions.
>
> Comments appreciated.
>
> Thanks,
> -- 
> -- 
> Peter
>
>
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