190637 2018-10-16 13:42:04 -0700 delete expression should not throw without a reference 2018-10-18 10:32:41 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 leo ross.kirsling commit-queue ews-watchlist fpizlo keith_miller mark.lam msaboff oliver ross.kirsling saam webkit-bug-importer ysuzuki oldest_to_newest 1469865 0 leo 2018-10-16 13:42:04 -0700 This test is wrong: https://github.com/WebKit/webkit/blob/master/LayoutTests/js/script-tests/basic-strict-mode.js#L153 ``` "use strict"; var a = { b: 42 }; delete void a.b; ``` The delete expression should not throw, but it throws a syntax error requiring a reference expression. The specs says the expression should return true when the right hand expression is not a reference: https://tc39.github.io/ecma262/#sec-delete-operator-runtime-semantics-evaluation the void expression will normally return undefined and this value is not a reference. This bug is only seen on JSC. Other major engines are showing the expected behavior. ``` eshost -x '"use strict"; var a = { b: 42 }; delete void a.b' #### v8-harmony #### v8 #### jsc SyntaxError: The delete operator requires a reference expression. #### spidermonkey #### ch #### node ``` The same happens if the expression is `delete void 0` or `delete typeof 0` but changing the expression from `delete (void 0)` gets the correct behavior. I'm sending some tests to Test262 to support this and prevent it from other occurrences. 1470356 1 352650 ross.kirsling 2018-10-17 15:11:16 -0700 Created attachment 352650 Patch 1470361 2 ross.kirsling 2018-10-17 15:30:34 -0700 This is really interesting -- looks like that SyntaxError has been in JSC's parser forever, yet even looking through old editions of ECMA-262, it doesn't seem like it was ever spec-compliant. I don't believe there are any test cases to be added here, since we're just removing a strict-mode check that seemingly ought to have never existed. 1470480 3 352650 ysuzuki 2018-10-18 00:02:37 -0700 Comment on attachment 352650 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=352650&action=review r=me. Could you update test262 expectations.yaml too? > LayoutTests/js/script-tests/basic-strict-mode.js:-153 > -shouldBeSyntaxError("'use strict'; if (0) delete +a.b"); > -shouldBeSyntaxError("'use strict'; if (0) delete ++a.b"); > -shouldBeSyntaxError("'use strict'; if (0) delete void a.b"); Lets' 1470481 4 352650 ysuzuki 2018-10-18 00:03:22 -0700 Comment on attachment 352650 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=352650&action=review >> LayoutTests/js/script-tests/basic-strict-mode.js:-153 >> -shouldBeSyntaxError("'use strict'; if (0) delete void a.b"); > > Lets' Oops. Let's keep these tests as follows. `shouldBeXXX(...)` 1470570 5 352705 ross.kirsling 2018-10-18 09:55:09 -0700 Created attachment 352705 Patch for landing 1470585 6 352705 commit-queue 2018-10-18 10:31:30 -0700 Comment on attachment 352705 Patch for landing Clearing flags on attachment: 352705 Committed r237259: <https://trac.webkit.org/changeset/237259> 1470586 7 commit-queue 2018-10-18 10:31:31 -0700 All reviewed patches have been landed. Closing bug. 1470587 8 webkit-bug-importer 2018-10-18 10:32:41 -0700 <rdar://problem/45375223> 352650 2018-10-17 15:11:16 -0700 2018-10-18 09:55:07 -0700 Patch bug-190637-20181017151115.patch text/plain 5277 ross.kirsling U3VidmVyc2lvbiBSZXZpc2lvbjogMjM3MjI2CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAw YzUyMjRlNDRjOTc0ODRlZGUxZjM2NzkyMTY0NWFmNGJhYTIxM2FmLi4zZTEyMTg4M2FlYTVkZWYx NzFkNjk4MDhlZGYyNjViYTIzZDZhZDNmIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNCBAQAorMjAxOC0xMC0xNyAgUm9zcyBLaXJzbGluZyAgPHJvc3Mua2lyc2xpbmdAc29u eS5jb20+CisKKyAgICAgICAgZGVsZXRlIGV4cHJlc3Npb24gc2hvdWxkIG5vdCB0aHJvdyB3aXRo b3V0IGEgcmVmZXJlbmNlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVn LmNnaT9pZD0xOTA2MzcKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKwor ICAgICAgICAqIHBhcnNlci9QYXJzZXIuY3BwOgorICAgICAgICAoSlNDOjpQYXJzZXI8TGV4ZXJU 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