171456 2017-04-28 15:43:29 -0700 Deep nesting is leading to ReferenceError for hoisted function 2017-04-29 16:22:51 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 163208 1 gskachkov gskachkov buildbot joepeck keith_miller mark.lam msaboff saam ysuzuki oldest_to_newest 1302837 0 gskachkov 2017-04-28 15:43:29 -0700 function boo () { { function foo() {} } if (true) { { { { { { { { { { let x = 0; print(x); } } } } } } } } } } print(!!foo); // ReferenceError: Can't find variable: foo, but should be true }; boo(); Error occurs because we do not copy hosting candidates when we increase buffer for scope stack, so we need to add , m_sloppyModeHoistableFunctionCandidates(WTFMove(other.m_sloppyModeHoistableFunctionCandidates)) to Scope constructor This error present in latest Safari and STP 1302839 1 gskachkov 2017-04-28 15:45:48 -0700 Will prepare patch tomorrow with tests. 1302852 2 saam 2017-04-28 16:08:55 -0700 (In reply to GSkachkov from comment #0) > function boo () { > { > function foo() {} > } > if (true) { > { > { > { > { > { > { > { > { > { > let x = 0; > print(x); > } > } > } > } > } > } > } > } > } > } Oh man this is glorious. Nice find. > print(!!foo); // ReferenceError: Can't find variable: foo, but should be > true > }; > boo(); > > Error occurs because we do not copy hosting candidates when we increase > buffer for scope stack, so we need to add , > m_sloppyModeHoistableFunctionCandidates(WTFMove(other. > m_sloppyModeHoistableFunctionCandidates)) to Scope constructor > > This error present in latest Safari and STP 1302993 3 308663 gskachkov 2017-04-29 03:22:45 -0700 Created attachment 308663 Patch Fix 1302997 4 308663 ysuzuki 2017-04-29 06:03:52 -0700 Comment on attachment 308663 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=308663&action=review Nice! r=me with comment. > Source/JavaScriptCore/parser/Parser.h:228 > { Listing all the members are not a scalable way. Can we just do `Scope(Scope&&) = default;` here? 1303032 5 gskachkov 2017-04-29 14:27:01 -0700 (In reply to Yusuke Suzuki from comment #4) > Comment on attachment 308663 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=308663&action=review > > Nice! r=me with comment. > > > Source/JavaScriptCore/parser/Parser.h:228 > > { > > Listing all the members are not a scalable way. Can we just do > `Scope(Scope&&) = default;` here? Done. Thanks for review! 1303033 6 gskachkov 2017-04-29 14:27:41 -0700 Patch landed https://trac.webkit.org/r215977 1303034 7 308663 gskachkov 2017-04-29 14:27:55 -0700 Comment on attachment 308663 Patch Clear flags 1303042 8 joepeck 2017-04-29 16:22:51 -0700 Nice! 308663 2017-04-29 03:22:45 -0700 2017-04-29 14:27:55 -0700 Patch bug-171456-20170429132235.patch text/plain 9564 gskachkov U3VidmVyc2lvbiBSZXZpc2lvbjogMjE1NTE1CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAw OTI4M2RjOWI2OGFkYWVkODFmMjRjMWM5MmM2MDAzNGJiZDI1NDFlLi42NzhhM2EzNmFiYzQyNTA2 YTBkYjI3YWUzMjE4YjhiYzQ1ZDA1MjdiIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxOCBAQAorMjAxNy0wNC0yOSAgT2xla3NhbmRyIFNrYWNoa292ICA8Z3NrYWNoa292QGdt YWlsLmNvbT4KKworICAgICAgICBEZWVwIG5lc3RpbmcgaXMgbGVhZGluZyB0byBSZWZlcmVuY2VF cnJvciBmb3IgaG9pc3RlZCBmdW5jdGlvbgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9y 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