184706 2018-04-17 13:40:05 -0700 A put is not an ExistingProperty put when we transition a structure because of an attributes change 2018-04-17 16:48:07 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jfbastien jfbastien commit-queue fpizlo jfbastien keith_miller mark.lam msaboff rmorisset saam webkit-bug-importer oldest_to_newest 1415258 0 jfbastien 2018-04-17 13:40:05 -0700 tryCachePutByID checks that the baseValue's structure is the same as the structure that's passed in. That's not necessarily true for some put operations, because they used to be able to do something like putDirect between the time the structure is obtained from the baseValue and the time tryCachePutByID is called. Instead we should delay getting the structure from baseValue until after putDirect is called, so that a change caused by putDirect doesn't cause confusion. 1415259 1 jfbastien 2018-04-17 13:41:11 -0700 <rdar://problem/38871451> 1415261 2 338145 jfbastien 2018-04-17 13:44:53 -0700 Created attachment 338145 patch 1415262 3 338145 saam 2018-04-17 13:50:14 -0700 Comment on attachment 338145 patch I don't see how this doesn't disable caching of all transitions. 1415263 4 338145 fpizlo 2018-04-17 13:50:48 -0700 Comment on attachment 338145 patch View in context: https://bugs.webkit.org/attachment.cgi?id=338145&action=review This change is wrong. It disables transition inline caching. That may fix a bug in transition inline caching, but it's not a correct fix. > JSTests/ChangeLog:3 > + put by ID should be aware of structure transitions This title is super scary and probably incorrect. put_by_id (the bytecode) and PutById (the DFG node) both know about structure transitions. They know *a lot* about them. So, you should make this title a lot more specific. > Source/JavaScriptCore/jit/JITOperations.cpp:528 > - Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr; > baseValue.putInline(exec, ident, value, slot); > RETURN_IF_EXCEPTION(scope, void()); > > if (accessType != static_cast<AccessType>(stubInfo->accessType)) > return; > - > + > + Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr; This is way wrong. The transition inline cache needs to know about the structure before the transition. > Source/JavaScriptCore/jit/JITOperations.cpp:556 > - Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr; > baseValue.putInline(exec, ident, value, slot); > RETURN_IF_EXCEPTION(scope, void()); > > if (accessType != static_cast<AccessType>(stubInfo->accessType)) > return; > - > + > + Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr; Ditto. > Source/JavaScriptCore/jit/JITOperations.cpp:582 > - > - Structure* structure = baseObject->structure(*vm); > + > baseObject->putDirect(*vm, ident, value, slot); > > if (accessType != static_cast<AccessType>(stubInfo->accessType)) > return; > - > + > + Structure* structure = baseObject->structure(*vm); Ditto. > Source/JavaScriptCore/jit/JITOperations.cpp:608 > - > - Structure* structure = baseObject->structure(*vm); > + > baseObject->putDirect(*vm, ident, value, slot); > > if (accessType != static_cast<AccessType>(stubInfo->accessType)) > return; > - > + > + Structure* structure = baseObject->structure(*vm); Ditto. 1415276 5 338149 jfbastien 2018-04-17 14:29:48 -0700 Created attachment 338149 patch 1415277 6 338149 saam 2018-04-17 14:31:56 -0700 Comment on attachment 338149 patch View in context: https://bugs.webkit.org/attachment.cgi?id=338149&action=review > JSTests/ChangeLog:3 > + A property isn't existing if we transition a structure This bug title is hard to parse, I'd suggest something like: A put is not an ExistingProperty put when we transition a structure because of an attributes change 1415278 7 338149 saam 2018-04-17 14:32:45 -0700 Comment on attachment 338149 patch View in context: https://bugs.webkit.org/attachment.cgi?id=338149&action=review > JSTests/stress/put-by-id-direct-strict-transition.js:11 > + const obj = { > + set hello(ignored) {}, > + [theglobal]: 0 > + }; Please also add a test for obj = { [theglobal]:0, set hello(ignored){} }; 1415288 8 338153 jfbastien 2018-04-17 14:55:16 -0700 Created attachment 338153 patch 1415303 9 jfbastien 2018-04-17 15:29:49 -0700 Confirmed perf neutral: Geomean of preferred means: <scaled-result> 18.2710+-0.1104 18.1661+-0.0614 might be 1.0058x faster 1415341 10 338153 commit-queue 2018-04-17 16:48:06 -0700 Comment on attachment 338153 patch Clearing flags on attachment: 338153 Committed r230740: <https://trac.webkit.org/changeset/230740> 1415342 11 commit-queue 2018-04-17 16:48:07 -0700 All reviewed patches have been landed. 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