166919 2017-01-10 23:59:47 -0800 "this" missing after await in async arrow function 2017-01-21 03:38:06 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified CLOSED FIXED P2 Normal --- 1 hszhsh webkit-unassigned caitp commit-queue gskachkov keith_miller mark.lam msaboff saam ysuzuki oldest_to_newest 1265696 0 hszhsh 2017-01-10 23:59:47 -0800 My test code is as follows. function runSomething(callback) { callback(); } class Test { testFunc() { this.prop = "123"; runSomething(async () => { console.log("callback " + this.prop); // It's ok here await sleep(2); console.log("callback end " + this.prop); // TypeError: undefined is not an object (evaluating 'this.prop') }); } } let t = new Test(); t.testFunc(); 1265732 1 gskachkov 2017-01-11 04:01:37 -0800 Hmm, it seems that find route of issue. At start execution of arrow function we load _this_ from virtual scope and put it to _this_ register, but when we suspend async arrow function and resume after await, we resume with value from generator.@generatorThis, that is empty. I'll try to prepare fix during today. 1265743 2 298574 gskachkov 2017-01-11 06:20:08 -0800 Created attachment 298574 Patch patch 1266102 3 298665 gskachkov 2017-01-11 23:55:06 -0800 Created attachment 298665 Patch Update readme 1267032 4 298665 saam 2017-01-15 12:36:17 -0800 Comment on attachment 298665 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=298665&action=review r=me > Source/JavaScriptCore/ChangeLog:10 > + Async arrow function can be suspende and during resuming shold be use _this_ from "suspende" => "suspended" "and during resuming shold be use _this_" => "and when resumed should use _this_" > JSTests/stress/async-arrow-functions-lexical-binding-in-class.js:52 > asyncThisPropBody() { Can you also add some tests where we bind various "this" values and make sure we get the correct result. 1268124 5 gskachkov 2017-01-19 10:35:26 -0800 All reviewed patches have been landed. Committed r210925: <http://trac.webkit.org/changeset/210925> 1268502 6 298665 gskachkov 2017-01-20 11:57:48 -0800 Comment on attachment 298665 Patch Clearing flags on attachment: 298665 Patch landed 1268509 7 gskachkov 2017-01-20 12:02:11 -0800 (In reply to comment #0) > My test code is as follows. > > function runSomething(callback) { > callback(); > } > > class Test { > testFunc() { > this.prop = "123"; > runSomething(async () => { > console.log("callback " + this.prop); // It's ok here > await sleep(2); > console.log("callback end " + this.prop); // TypeError: undefined is not > an object (evaluating 'this.prop') > }); > } > } > > let t = new Test(); > t.testFunc(); Shuan Zhao, Could you please check if issue is fixed and close it? I don't have permissions to do this. 1268746 8 gskachkov 2017-01-21 03:38:06 -0800 Shuan Zhao, Thanks for filling and closing issue :-)! Saam Barati, Thanks for review! 298574 2017-01-11 06:20:08 -0800 2017-01-11 23:54:56 -0800 Patch bug-166919-20170111161829.patch text/plain 7611 gskachkov U3VidmVyc2lvbiBSZXZpc2lvbjogMjEwNTU4CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBj YmZhYjkyMmZkZWZjNGJkMTU0YzNhYjllNTFjNjNjZjQxM2QxYjViLi5hY2Y0OWJlZjU3NWVlYTQ5 NTk1ZGYyMWFmMzk1NzAyYWRlMTNhMWMxIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxNyBAQAorMjAxNy0wMS0xMSAgU2thY2hrb3YgT2xla3NhbmRyICA8Z3NrYWNoa292QGdt YWlsLmNvbT4KKworICAgICAgICAidGhpcyIgbWlzc2luZyBhZnRlciBhd2FpdCBpbiBhc3luYyBh cnJvdyBmdW5jdGlvbgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5j Z2k/aWQ9MTY2OTE5CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAg ICAgICAgVGhpcyBwYXRjaCBpcyBmaXggaXNzdWUgaW4gYXN5bmMgYXJyb3cgZnVuY3Rpb24uIElz 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