[PATCH] D65585: WIP: [llvm-locstats] Add the llvm-locstats tool

[Adrian Prantl via llvm-commits]

> On Aug 2, 2019, at 6:10 PM, vsk at apple.com wrote:
> 
> Hi Djordje,
> 
> I take your point about not wanting to clutter up llvm-dwarfdump --statistics output.
> 
> I'll note that, beyond code sharing, there are significant benefits to emitting all `locstats` information using the existing `--statistics` option:
> 
> 1) We can check in a simple script in utils/ to pretty-print the `--statistics` JSON output, such that we get exactly what is emitted by the `locstats` tool today.
> 
> 2) Emitting stats in JSON is great for continuous integration jobs that track debug info quality over time. It'd be great to include the metrics reported by `locstats` in these jobs.

And I should point out that this is not a hypothetical scenario. This job:

http://green.lab.llvm.org/green/view/LLDB/job/clang-3.4-debuginfo-statistics/ <http://green.lab.llvm.org/green/view/LLDB/job/clang-3.4-debuginfo-statistics/>

Pushes data into:

http://lnt.llvm.org/db_default/v4/nts/machine/1357 <http://lnt.llvm.org/db_default/v4/nts/machine/1357>

which generates graphs like:

http://lnt.llvm.org/db_default/v4/nts/graph?plot.0=1357.1607043.4&highlight_run=127815 <http://lnt.llvm.org/db_default/v4/nts/graph?plot.0=1357.1607043.4&highlight_run=127815>

several times per hour. Any new JSON fields show up there without any extra manual intervention.

-- adrian
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