186812 2018-06-19 12:15:07 -0700 constructArray variants should take the slow path for subclasses of Array 2018-06-19 13:10:16 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 keith_miller keith_miller ews-watchlist mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1434477 0 keith_miller 2018-06-19 12:15:07 -0700 constructArray variants should take the slow path for subclasses of Array 1434478 1 343072 keith_miller 2018-06-19 12:15:38 -0700 Created attachment 343072 Patch 1434482 2 343072 saam 2018-06-19 12:20:19 -0700 Comment on attachment 343072 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=343072&action=review > Source/JavaScriptCore/ChangeLog:9 > + allocate a new structure for an indexing type change while initializing Why are we doing an indexing type change? Why would that only effect sublasses? > Source/JavaScriptCore/runtime/JSArray.cpp:1411 > +JSArray* constructArray(ExecState* exec, Structure* arrayStructure, const ArgList& values) > +{ > + VM& vm = exec->vm(); > + unsigned length = values.size(); > + ObjectInitializationScope scope(vm); > + > + // FIXME: We only need this for subclasses of Array because we might need to allocate a new structure to change > + // indexing types while initializing. If this triggered a GC then we might scan our currently uninitialized > + // array and crash. https://bugs.webkit.org/show_bug.cgi?id=186811 > + JSArray* array; > + if (arrayStructure->globalObject()->isOriginalArrayStructure(arrayStructure)) > + array = JSArray::tryCreateUninitializedRestricted(scope, arrayStructure, length); > + else > + array = JSArray::create(vm, arrayStructure, length); > + > + // FIXME: we should probably throw an out of memory error here, but > + // when making this change we should check that all clients of this > + // function will correctly handle an exception being thrown from here. > + // https://bugs.webkit.org/show_bug.cgi?id=169786 > + RELEASE_ASSERT(array); > + > + for (unsigned i = 0; i < length; ++i) > + array->initializeIndex(scope, i, values.at(i)); > + return array; > +} > + > +JSArray* constructArray(ExecState* exec, Structure* arrayStructure, const JSValue* values, unsigned length) > +{ > + VM& vm = exec->vm(); > + ObjectInitializationScope scope(vm); > + // FIXME: We only need this for subclasses of Array because we might need to allocate a new structure to change > + // indexing types while initializing. If this triggered a GC then we might scan our currently uninitialized > + // array and crash. https://bugs.webkit.org/show_bug.cgi?id=186811 > + JSArray* array; > + if (arrayStructure->globalObject()->isOriginalArrayStructure(arrayStructure)) > + array = JSArray::tryCreateUninitializedRestricted(scope, arrayStructure, length); > + else > + array = JSArray::create(vm, arrayStructure, length); > + > + // FIXME: we should probably throw an out of memory error here, but > + // when making this change we should check that all clients of this > + // function will correctly handle an exception being thrown from here. > + // https://bugs.webkit.org/show_bug.cgi?id=169786 > + RELEASE_ASSERT(array); > + > + for (unsigned i = 0; i < length; ++i) > + array->initializeIndex(scope, i, values[i]); > + return array; > +} > + > +JSArray* constructArrayNegativeIndexed(ExecState* exec, Structure* arrayStructure, const JSValue* values, unsigned length) > +{ > + VM& vm = exec->vm(); > + ObjectInitializationScope scope(vm); > + // FIXME: We only need this for subclasses of Array because we might need to allocate a new structure to change > + // indexing types while initializing. If this triggered a GC then we might scan our currently uninitialized > + // array and crash. https://bugs.webkit.org/show_bug.cgi?id=186811 > + JSArray* array; > + if (arrayStructure->globalObject()->isOriginalArrayStructure(arrayStructure)) > + array = JSArray::tryCreateUninitializedRestricted(scope, arrayStructure, length); > + else > + array = JSArray::create(vm, arrayStructure, length); > + > + // FIXME: we should probably throw an out of memory error here, but > + // when making this change we should check that all clients of this > + // function will correctly handle an exception being thrown from here. > + // https://bugs.webkit.org/show_bug.cgi?id=169786 > + RELEASE_ASSERT(array); > + > + for (int i = 0; i < static_cast<int>(length); ++i) > + array->initializeIndex(scope, i, values[-i]); > + return array; > +} So much repeated code. Can we abstract this in some way? Also, is inlining this really not profitable? 1434483 3 343072 mark.lam 2018-06-19 12:21:19 -0700 Comment on attachment 343072 Patch Can you add tests for this? r=me too. 1434489 4 343072 keith_miller 2018-06-19 12:31:12 -0700 Comment on attachment 343072 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=343072&action=review >> Source/JavaScriptCore/ChangeLog:9 >> + allocate a new structure for an indexing type change while initializing > > Why are we doing an indexing type change? Why would that only effect sublasses? For non-subclasses we have the structure cached on the global object so no allocation happens. We do an indexing type change because before the allocation profile is set up we don't know what values we are going to stick into the array. It's possible we should be scanning the arguments to compute the indexing type we should use. This would avoid a late indexing type change and rewriting the butterfly. >> Source/JavaScriptCore/runtime/JSArray.cpp:1411 >> +} > > So much repeated code. Can we abstract this in some way? > > Also, is inlining this really not profitable? I guess we could use a template and have a functor that provides the arguments. 1434490 5 keith_miller 2018-06-19 12:31:33 -0700 (In reply to Mark Lam from comment #3) > Comment on attachment 343072 [details] > Patch > > Can you add tests for this? r=me too. This is fixing already broken tests. 1434500 6 mark.lam 2018-06-19 12:40:44 -0700 (In reply to Keith Miller from comment #5) > (In reply to Mark Lam from comment #3) > > Comment on attachment 343072 [details] > > Patch > > > > Can you add tests for this? r=me too. > > This is fixing already broken tests. nit: can you note in the ChangeLog that this is covered by existing tests? 1434502 7 343083 keith_miller 2018-06-19 12:42:22 -0700 Created attachment 343083 Patch 1434508 8 343087 keith_miller 2018-06-19 12:52:26 -0700 Created attachment 343087 Patch 1434511 9 343072 saam 2018-06-19 12:55:58 -0700 Comment on attachment 343072 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=343072&action=review >>> Source/JavaScriptCore/runtime/JSArray.cpp:1411 >>> +} >> >> So much repeated code. Can we abstract this in some way? >> >> Also, is inlining this really not profitable? > > I guess we could use a template and have a functor that provides the arguments. What about making this no longer inlined? 1434512 10 keith_miller 2018-06-19 13:02:58 -0700 (In reply to Saam Barati from comment #9) > Comment on attachment 343072 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=343072&action=review > > >>> Source/JavaScriptCore/runtime/JSArray.cpp:1411 > >>> +} > >> > >> So much repeated code. Can we abstract this in some way? > >> > >> Also, is inlining this really not profitable? > > > > I guess we could use a template and have a functor that provides the arguments. > > What about making this no longer inlined? Oh I doubt that matters since we don't really have information about the structure and the allocation methods were already out of line. 1434514 11 keith_miller 2018-06-19 13:09:22 -0700 Committed r232977: <https://trac.webkit.org/changeset/232977> 1434515 12 webkit-bug-importer 2018-06-19 13:10:16 -0700 <rdar://problem/41260811> 343072 2018-06-19 12:15:38 -0700 2018-06-19 12:42:21 -0700 Patch bug-186812-20180619121537.patch text/plain 8085 keith_miller U3VidmVyc2lvbiBSZXZpc2lvbjogMjMyOTUzCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAx M2EyNWRiYWJmYzFmMTJlZWQwNmRjNWFkZjg1MGYwODhhNTg0ZjRmLi5jMGQ0N2JkZWVmNjAxYTA2 YWNiOGNkMDc0ZTkwMWE5YzBkZDY2NmY0IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyMiBAQAorMjAxOC0wNi0xOSAgS2VpdGggTWlsbGVyICA8a2VpdGhfbWlsbGVyQGFwcGxl LmNvbT4KKworICAgICAgICBjb25zdHJ1Y3RBcnJheSB2YXJpYW50cyBzaG91bGQgdGFrZSB0aGUg 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