[Webkit-unassigned] [Bug 141809] New: [JSObjCClassInfo reallocateConstructorAndOrPrototype] should also reallocate super class prototype chain
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Feb 19 13:36:33 PST 2015
https://bugs.webkit.org/show_bug.cgi?id=141809
Bug ID: 141809
Summary: [JSObjCClassInfo reallocateConstructorAndOrPrototype]
should also reallocate super class prototype chain
Classification: Unclassified
Product: WebKit
Version: 528+ (Nightly build)
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
Assignee: webkit-unassigned at lists.webkit.org
Reporter: mark.lam at apple.com
A ObjC class that implement the JSExport protocol will have a JS prototype chain and constructor automatically synthesized for its JS wrapper object. However, if there are no more instances of that ObjC class reachable by a GC root scan, then its synthesized prototype chain and constructors may be released by the GC. If a new instance of that ObjC class is instantiated, then [JSObjCClassInfo reallocateConstructorAndOrPrototype] should re-construct the prototype chain and constructor (if they were released). However, the current implementation only re-constructs the immediate prototype, but not every other prototype object upstream in the prototype chain.
The fix is to have [JSObjCClassInfo reallocateConstructorAndOrPrototype] recurse and call itself for the super class if the super class' prototype is not initialized (implying that the super class also needs to re-construct its prototype and constructor).
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