193413 2019-01-14 15:24:10 -0800 [JSC] AI should check the given constant's array type when folding GetByVal into constant 2019-01-14 17:26:49 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki ews-watchlist keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1494343 0 ysuzuki 2019-01-14 15:24:10 -0800 GetByVal has Double ArrayModes. So it expects to get Double arrays, and it will genetate a double value. To ensure that, we have CheckStructure / CheckArray before this GetByVal. But in AI phase, CheckStructure and CheckArray would not perform anything on a proven abstract value. In that case, our GetByVal in AI gets unexpected array. If we do not perform any checks before using that to fold GetByVal into a constant, we have a bad time. 1: JSConstant(Array with CopyOnWrite | Contiguous) => like, ["bad"] 2: CheckStructure(@1, Array CopyOnWrite | Double) => It finally becomes OSR exit, but now, AI is not sure about it. 3: GetButterfly(@1) 4: GetByVal(@1, 0, @3, Array CopyOnWrite | Double) => If @4 can retrieve "bad" from @1, we attempt to convert @4 into "bad", but it is not acceptable since GetByVal(Double shape) should return a Double result. We should perform array check on @1 constant before performing constant folding in AI. 1494345 1 ysuzuki 2019-01-14 15:25:34 -0800 <rdar://problem/46092389> 1494398 2 359098 ysuzuki 2019-01-14 16:45:35 -0800 Created attachment 359098 Patch 1494402 3 359099 ysuzuki 2019-01-14 16:49:28 -0800 Created attachment 359099 Patch 1494411 4 359099 keith_miller 2019-01-14 17:12:39 -0800 Comment on attachment 359099 Patch r=me. 1494418 5 ysuzuki 2019-01-14 17:26:49 -0800 Committed r239964: <https://trac.webkit.org/changeset/239964> 359098 2019-01-14 16:45:35 -0800 2019-01-14 16:49:27 -0800 Patch bug-193413-20190114164535.patch text/plain 8169 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjM5OTU1CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBj YzViMzkyOTFiNmQ5N2I2OWQ5MTg4YTM1ZWIxMmRjYzNmZTYzNWU2Li5mOTQxZWU0MmQ4M2Q4ZDFm MTIyNTA5YjE2YmVkNDFjM2E3ZGUwMWNhIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv 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