[Piglit] use JSON to report between tests and the python framework

[Dylan Baker]

bump

On Wednesday, June 11, 2014 04:32:30 PM Dylan Baker wrote:
> This series replaces the use of eval() in
> exectest.PiglitTest.interpret_restul() with json.loads(). This has a
> couple of advantages. First, eval compiles code on the fly, and is known
> to be slow. It's better not to use eval whenever possible for that
> reason alone. But the more serious problem is that eval() allows for
> arbitrary code execution.
> 
> Fortunately for us python dicts (which is what we use eval() on) looks a
> lot like JSON, and we already ahve a fast JSON library available.
> 
> Patch 1 replaces eval() with json
> Patch 2 makes subtest reporting simpler, by leveraging JSON
> Patch 3 removes some extra whitespce in our output, I'm kinda iffy on
> whether this patch is worth it.
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