201897 2019-09-17 21:10:52 -0700 Syntax checker should report duplicate __proto__ properties 2019-09-19 11:45:20 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 tzagallo tzagallo commit-queue ews-watchlist keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1571798 0 tzagallo 2019-09-17 21:10:52 -0700 <rdar://problem/53201788> 1571824 1 379022 tzagallo 2019-09-17 22:44:21 -0700 Created attachment 379022 Patch 1571896 2 379022 mark.lam 2019-09-18 08:10:35 -0700 Comment on attachment 379022 Patch For a change like this, can you run test262 to make sure there are no regressions? I wonder what was the rationale for having a different parseStrictObjectLiteral() in the first place. 1571909 3 379022 mark.lam 2019-09-18 08:44:36 -0700 Comment on attachment 379022 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=379022&action=review r=me if test262 passes. > Source/JavaScriptCore/ChangeLog:14 > + When syntax checking in sloppy mode, we call parseObjectLiteral, which does not fill the > + property names and therefore fails to detect the duplicate __proto__ properties. We replace > + parseObjectLiteral with the strict version since: > + - the only difference between parseObjectLiteral and parseStrictObjectLiteral seems to be > + whether we store the properties' names > + - parseObjectLiteral has to fallback to parseStrictObjectLiteral in the presence of getters/setters. Ok, I think I understand the difference now. parseObjectLiteral() passes TreeBuilder::DontBuildStrings to the Lexer, but parseStrictObjectLiteral() does not. This appears to be an optimization that went wrong, because the parser relies on getting the token strings in order to do the redefined __proto__ check. But since it told the lexer not to build this token (which it wrongly presumed is unnecessary work for the SyntaxChecker), the test fails. It is safe to always use parseStrictObjectLiteral() instead because there is actually no semantic difference in terms of "strict" vs "sloppy": parseStrictObjectLiteral() is also misnamed. Can you please put these details in the ChangeLog? You should still run test262 to make sure there are no hidden surprises here. 1572186 4 tzagallo 2019-09-18 18:51:30 -0700 Thanks for the review. I checked test262 and JetStream2 and it seems all good. I'll update the ChangeLog before landing it. 1572412 5 379148 tzagallo 2019-09-19 10:49:46 -0700 Created attachment 379148 Patch for landing 1572422 6 379148 commit-queue 2019-09-19 11:45:19 -0700 Comment on attachment 379148 Patch for landing Clearing flags on attachment: 379148 Committed r250098: <https://trac.webkit.org/changeset/250098> 1572423 7 commit-queue 2019-09-19 11:45:20 -0700 All reviewed patches have been landed. Closing bug. 379022 2019-09-17 22:44:21 -0700 2019-09-19 10:49:45 -0700 Patch bug-201897-20190917224420.patch text/plain 7170 tzagallo U3VidmVyc2lvbiBSZXZpc2lvbjogMjQ5OTE4CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBh ZWVmNmM3ZTlmYWE5ZWJlODk2MWQyNGVmNzRhYTAyZWJhZTQyY2ZhLi5hNTE1YzgxZDMxZDQyNjcx ZTk1NTJjNzJjZjNlZmI3YWFiZjYwMTdmIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyNCBAQAorMjAxOS0wOS0xNyAgVGFkZXUgWmFnYWxsbyAgPHR6YWdhbGxvQGFwcGxlLmNv bT4KKworICAgICAgICBTeW50YXggY2hlY2tlciBzaG91bGQgcmVwb3J0IGR1cGxpY2F0ZSBfX3By b3RvX18gcHJvcGVydGllcworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9MjAxODk3CisgICAgICAgIDxyZGFyOi8vcHJvYmxlbS81MzIwMTc4OD4KKworICAg ICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBXaGVuIHN5bnRheCBj aGVja2luZyBpbiBzbG9wcHkgbW9kZSwgd2UgY2FsbCBwYXJzZU9iamVjdExpdGVyYWwsIHdoaWNo 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