JavaScript: Fix InconsistentNew performance regression.#603
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November 30, 2018 15:40
All the filtering is now done in `getALikelyCallee`, to which I have also added an additional parameter that improves the join in the `select` clause. I've also simplified the alert message to no longer use `toString`, which isn't meant for alert messages anyway. (This is an old query.)
ghost
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Dec 3, 2018
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This might not be tested with a dist-upgrade before the release, so ping @asger-semmle for a second review. |
asger-semmle
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I gave it a brief read earlier with nothing to remark. LGTM
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We have one more distribution upgrade before the release (but of course more eyes are always good). |
cklin
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Add port of the existing compiler-tracing.spec files to the new Lua tracing infrastructure.
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As noted by Alex ET, this query has significantly regressed in performance from 1.18 on
rhino. I can't immediately see any query or library changes that would have caused it, but it's not difficult to fix by refactoring the query; see first commit.Looking at the results on
rhino, I then noticed that the query was producing a humongous number of result links since it listed all calls to the function withnewand all without, ballooning 17 alerts onrhinointo >80K result tuples. The second commit fixes this by only showing one call withnewand one without, picking the first one when sorted lexicographically by file name, line and column.Comparing three versions of the query (before this PR, after the first commit, and after the second commit) shows no changes in alerts, and reasonable performance (internal link). Note that the table shows only the runtimes for the query itself, but I ran
definitions.qlbefore to warm the cache. While some projects exhibit a slowdown of ten seconds or more, these are outliers, and worth the improved quality of results, I think.Since this is a regression from 1.18, I'm proposing this as a hotfix.