143012 2015-03-24 12:53:52 -0700 ES6: Classes: Early return in sub-class constructor results in returning undefined instead of instance 2015-03-24 18:19:28 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 joepeck joepeck ggaren joepeck rniwa timothy oldest_to_newest 1079663 0 joepeck 2015-03-24 12:53:52 -0700 * SUMMARY Early return in sub-class constructor results in returning undefined instead of instance * TEST <script> class Base { constructor(){ return; } } class Derived extends Base { constructor() { super(); // This early return breaks things. return; } } var x = new Derived; console.log(x); // undefined, should be new Derived. </script> * EXPECTED Derived instance in `x`. * ACTUAL undefined in `x`. 1079673 1 joepeck 2015-03-24 13:13:42 -0700 I think the relevant portion is [[Construct]]: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-ecmascript-function-objects-construct-argumentslist-newtarget Which has: > 13. If result.[[type]] is return, then > a. If Type(result.[[value]]) is Object, return NormalCompletion(result.[[value]]). > b. If kind is "base", return NormalCompletion(thisArgument). > c. If result.[[value]] is not undefined, throw a TypeError exception. > 14. Else, ReturnIfAbrupt(result). > 15. Return envRec.GetThisBinding(). That seems weird to me. It sounds like if you early return from a base class constructor, you will get the "thisArgument". And if you early return from a derived class constructor we return "envRec.GetThisBinding()". Either way, my interpretation is that if we do an implicit return of undefined, we would get some "this" object. 1079709 2 joepeck 2015-03-24 14:13:15 -0700 I think I see the issue. I'll investigate. 1079795 3 249370 joepeck 2015-03-24 18:02:58 -0700 Created attachment 249370 [PATCH] Proposed Fix 1079799 4 249370 rniwa 2015-03-24 18:10:46 -0700 Comment on attachment 249370 [PATCH] Proposed Fix View in context: https://bugs.webkit.org/attachment.cgi?id=249370&action=review > Source/JavaScriptCore/bytecompiler/BytecodeGenerator.cpp:1943 > + if (!derived) > + emitUnaryNoDstOp(op_ret, &m_thisRegister); > + else { I think this reads better if we checked if (derived) and put emitUnaryNoDstOp(op_ret, &m_thisRegister); after the if block. 1079804 5 joepeck 2015-03-24 18:19:28 -0700 http://trac.webkit.org/changeset/181924 249370 2015-03-24 18:02:58 -0700 2015-03-24 18:10:46 -0700 [PATCH] Proposed Fix cosntructor-return.patch text/plain 26944 joepeck ZGlmZiAtLWdpdCBhL0xheW91dFRlc3RzL0NoYW5nZUxvZyBiL0xheW91dFRlc3RzL0NoYW5nZUxv ZwppbmRleCAzNTc1ZmVjLi45N2E3NjY1IDEwMDY0NAotLS0gYS9MYXlvdXRUZXN0cy9DaGFuZ2VM 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