[LLVMdev] debugloc metadata variation (original) (raw)

Sean Silva chisophugis at gmail.com
Wed Oct 22 17:41:22 PDT 2014

On Wed, Oct 22, 2014 at 4:57 PM, David Blaikie <dblaikie at gmail.com> wrote:

Just working on some of the gmlt+fission debug info stuff and I came across a comment that might be relevant to reducing the number of distinct debugloc metadata nodes:

"or some sub-optimal metadata that // isn't structurally identical (see: file path/name info from clang, which // includes the directory of the cpp file being built, even when the file name // is absolute (such as an <> lookup header)))" Seems that the file path/name isn't well canonicalized so as to allow metadata level merging when linking. Might be helpful to figure out that issue at some point.

I wonder how much memory is spent on redundant path prefixes. E.g.

/really/really/really/long/path/to/foo.h /really/really/really/long/path/to/bar.h

-- Sean Silva

- David

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