236843 2022-02-18 09:28:49 -0800 [JSC] ReferenceError when using extra parens in class fields 2022-03-21 12:58:33 -0700 1 1 1 Unclassified WebKit JavaScriptCore Safari Technology Preview Mac (Intel) macOS 11 RESOLVED FIXED InRadar P2 Normal --- 1 mitchell.liam ysuzuki ews-watchlist keith_miller mark.lam msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1843456 0 452527 mitchell.liam 2022-02-18 09:28:49 -0800 Created attachment 452527 Two reproducible examples Extra params inside class field declarations cause ReferenceErrors. Example 1: ;(() => { const a = (x) => x class B { c = a(('OK')); } // Should write 'OK' document.write(new B().c) })() Throws ReferenceError: Can't find variable: a Example 2: ;(() => { const a = 'OK' class B { static c = { d: a, e: (1), } } // Should write 'OK' document.write(B.c.d) })() Throws ReferenceError: Can't find variable: a Tested on Safari TP 15.4, Safari 15.2, 15.3, iOS 14.5, 15.0 1843781 1 mitchell.liam 2022-02-18 21:18:20 -0800 This is only reproducible without dev tools. If dev tools is open, the code works as expected. 1845369 2 webkit-bug-importer 2022-02-23 15:41:02 -0800 <rdar://problem/89382583> 1848385 3 keith_miller 2022-03-04 13:29:30 -0800 Hi Liam, Thanks for the report! Given that it doesn't happen with the DevTools open it sounds like this could be a JIT bug. 1848386 4 keith_miller 2022-03-04 13:30:25 -0800 Actually I'm not so sure it's a JIT bug; you don't have any loops in the code you're running. 1848390 5 keith_miller 2022-03-04 13:38:21 -0800 Looks like we're failing to create a lexical environment when the extra parens are there for some reason... (function foo() { const a = (x) => x class B { // c = a('OK'); c = a(('OK')); } // Should write 'OK' print(new B().c) })() produces the following byte code: foo#CMKAuY:[0x1078f4130->0x107871300, NoneFunctionCall, 100]: 25 instructions (0 16-bit instructions, 0 32-bit instructions, 8 instructions with metadata); 216 bytes (116 metadata bytes); 1 parameter(s); 20 callee register(s); 7 variable(s); scope at loc4 bb#1 Predecessors: [ ] [ 0] enter [ 1] get_scope dst:loc4 [ 3] mov dst:loc5, src:loc4 [ 6] check_traps [ 7] mov dst:loc6, src:callee [ 10] mov dst:loc7, src:<JSValue()>(const0) [ 13] mov dst:loc8, src:<JSValue()>(const0) [ 16] new_func_exp dst:loc7, scope:loc4, functionDecl:0 [ 20] mov dst:loc9, src:<JSValue()>(const0) [ 23] new_func_exp dst:loc10, scope:loc4, functionDecl:1 [ 27] new_object dst:loc11, inlineCapacity:0 [ 31] define_data_property base:loc11, property:String (atomic),8Bit:(1),length:(11): constructor, StructureID: 16608(const1), value:loc10, attributes:Int32: 89(const2) [ 36] define_data_property base:loc10, property:String (atomic),8Bit:(1),length:(9): prototype, StructureID: 16608(const3), value:loc11, attributes:Int32: 74(const4) [ 41] new_func_exp dst:loc12, scope:loc4, functionDecl:2 [ 45] put_by_id base:loc12, property:0, value:loc11, flags:Strict [ 51] put_by_id base:loc10, property:1, value:loc12, flags:IsDirect|Strict [ 57] mov dst:loc9, src:loc10 [ 60] mov dst:loc8, src:loc10 [ 63] resolve_scope dst:loc12, scope:loc4, var:2, resolveType:GlobalProperty, localScopeDepth:0 [ 70] get_from_scope dst:loc9, scope:loc12, var:2, getPutInfo:2048<ThrowIfNotFound|GlobalProperty|NotInitialization|NotStrictMode>, localScopeDepth:0, offset:0 [ 78] mov dst:loc14, src:loc8 [ 81] construct dst:loc13, callee:loc8, argc:1, argv:20 [ 87] get_by_id dst:loc11, base:loc13, property:3 [ 92] call dst:loc9, callee:loc9, argc:2, argv:18 [ 98] ret value:Undefined(const5) Successors: [ ] but if the comments are flipped we get: foo#CpArJP:[0x103ff4130->0x103f71300, NoneFunctionCall, 113]: 27 instructions (0 16-bit instructions, 0 32-bit instructions, 9 instructions with metadata); 229 bytes (116 metadata bytes); 1 parameter(s); 20 callee register(s); 7 variable(s); scope at loc4 bb#1 Predecessors: [ ] [ 0] enter [ 1] get_scope dst:loc4 [ 3] mov dst:loc5, src:loc4 [ 6] check_traps [ 7] mov dst:loc6, src:callee [ 10] create_lexical_environment dst:loc8, scope:loc4, symbolTable:Cell: 0x104100da8 (0x280004700:[0x4700/18176, SymbolTable, (0/0, 0/0){}, NonArray, Leaf]), StructureID: 18176(const0), initialValue:<JSValue()>(const1) [ 15] mov dst:loc4, src:loc8 [ 18] mov dst:loc7, src:<JSValue()>(const1) [ 21] new_func_exp dst:loc9, scope:loc4, functionDecl:0 [ 25] put_to_scope scope:loc8, var:0, value:loc9, getPutInfo:1049604<DoNotThrowIfNotFound|ResolvedClosureVar|ConstInitialization|NotStrictMode>, symbolTableOrScopeDepth:0, offset:0 [ 33] mov dst:loc9, src:<JSValue()>(const1) [ 36] new_func_exp dst:loc10, scope:loc4, functionDecl:1 [ 40] new_object dst:loc11, inlineCapacity:0 [ 44] define_data_property base:loc11, property:String (atomic),8Bit:(1),length:(11): constructor, StructureID: 16608(const2), value:loc10, attributes:Int32: 89(const3) [ 49] define_data_property base:loc10, property:String (atomic),8Bit:(1),length:(9): prototype, StructureID: 16608(const4), value:loc11, attributes:Int32: 74(const5) [ 54] new_func_exp dst:loc12, scope:loc4, functionDecl:2 [ 58] put_by_id base:loc12, property:1, value:loc11, flags:Strict [ 64] put_by_id base:loc10, property:2, value:loc12, flags:IsDirect|Strict [ 70] mov dst:loc9, src:loc10 [ 73] mov dst:loc7, src:loc10 [ 76] resolve_scope dst:loc12, scope:loc4, var:3, resolveType:GlobalProperty, localScopeDepth:1 [ 83] get_from_scope dst:loc9, scope:loc12, var:3, getPutInfo:2048<ThrowIfNotFound|GlobalProperty|NotInitialization|NotStrictMode>, localScopeDepth:1, offset:0 [ 91] mov dst:loc14, src:loc7 [ 94] construct dst:loc13, callee:loc7, argc:1, argv:20 [ 100] get_by_id dst:loc11, base:loc13, property:4 [ 105] call dst:loc9, callee:loc9, argc:2, argv:18 [ 111] ret value:Undefined(const6) Successors: [ ] 1853133 6 455222 ysuzuki 2022-03-21 02:37:26 -0700 Created attachment 455222 Patch 1853279 7 455222 saam 2022-03-21 12:04:15 -0700 Comment on attachment 455222 Patch r=me 1853300 8 ews-feeder 2022-03-21 12:58:29 -0700 Committed r291577 (248677@main): <https://commits.webkit.org/248677@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 455222. 452527 2022-02-18 09:28:49 -0800 2022-02-18 09:28:49 -0800 Two reproducible examples ReferenceError1.html text/html 501 mitchell.liam PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPHRpdGxlPmlPUyBTYWZhcmkvV2ViS2l0IGNs YXNzIHByb3BlcnR5IFJlZmVyZW5jZUVycm9yPC90aXRsZT4KPC9oZWFkPgo8Ym9keT4KPHNjcmlw dCB0eXBlPSJ0ZXh0L2phdmFzY3JpcHQiPgp3aW5kb3cub25lcnJvciA9IChtZXNzYWdlKSA9PiB7 CiAgZG9jdW1lbnQud3JpdGUobWVzc2FnZSkgIAp9Cgo7KCgpID0+IHsKICBjb25zdCBhID0gKHgp ID0+IHgKICAKICBjbGFzcyBCIHsKICAgIGMgPSBhKCgnT0snKSk7CiAgfQoKICAvLyBTaG91bGQg d3JpdGUgJ09LJwogIGRvY3VtZW50LndyaXRlKG5ldyBCKCkuYykKfSkoKQoKOygoKSA9PiB7CiAg Y29uc3QgYSA9ICdPSycKCiAgY2xhc3MgQiB7CiAgICBzdGF0aWMgYyA9IHsKICAgICAgZDogYSwK ICAgICAgZTogKDEpLAogICAgfQogIH0KCiAgLy8gU2hvdWxkIHdyaXRlICdPSycKICBkb2N1bWVu dC53cml0ZShCLmMuZCkKfSkoKQo8L3NjcmlwdD4KPC9ib2R5Pgo8L2h0bWw+ 455222 2022-03-21 02:37:26 -0700 2022-03-21 12:58:31 -0700 Patch bug-236843-20220321023725.patch text/plain 5337 ysuzuki 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