135258 2014-07-24 14:34:54 -0700 JSWrapperMap's jsWrapperForObject() needs to keep weak prototype and constructors from being GCed 2014-07-24 18:00:57 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 135265 1 mark.lam mark.lam commit-queue fpizlo ggaren mhahnenberg mmirman msaboff oliver webkit-bug-importer oldest_to_newest 1024612 0 mark.lam 2014-07-24 14:34:54 -0700 In the process of creating a JS wrapper, jsWrapperForObject() will create the prototype and constructor of the corresponding ObjC class, as well as for classes in its inheritance chain. These prototypes and constructors are stored in Weak references in the JSObjCClassInfo objects. During all the allocation that is being done to create all the prototypes and constructors as well as the wrapper objects, a GC may occur thereby collecting one or more of these newly created prototype and constructor objects. One example of where this problem can manifest is in wrapperForObject() which is called from jsWrapperForObject(). In wrapperFoObject(), we do the following steps: 1. reallocateConstructorAndOrPrototype() which creates the prototype object and store it in JSObjCClassInfo's m_prototype which is a Weak ref. 2. makeWrapper() to create the wrapper object, which may trigger a GC. GC will collect the prototype object and nullify the corresponding JSObjCClassInfo's m_prototype Weak ref. 3. call JSObjectSetPrototype() to set the JSObjCClassInfo's m_prototype in the newly created wrapper. This results in the wrapper getting a jsNull as a prototype instead of the expected prototype object. To ensure that the prototype and constructor objects are retained until they can be referenced properly from the wrapper object, jsWrapperForObject() should defer GC until it's done with its work. 1024616 1 mark.lam 2014-07-24 14:41:04 -0700 <rdar://problem/17757800> 1024618 2 235463 mark.lam 2014-07-24 14:42:31 -0700 Created attachment 235463 the patch. 1024625 3 mark.lam 2014-07-24 15:03:58 -0700 Thanks. Landed in r171527: <http://trac.webkit.org/r171527>. 1024651 4 commit-queue 2014-07-24 16:11:31 -0700 Re-opened since this is blocked by bug 135265 1024695 5 235478 mark.lam 2014-07-24 17:18:44 -0700 Created attachment 235478 patch 2: new fix that does not defer GC 1024696 6 235478 mhahnenberg 2014-07-24 17:21:32 -0700 Comment on attachment 235478 patch 2: new fix that does not defer GC r=me 1024713 7 mark.lam 2014-07-24 18:00:57 -0700 Thanks. New fix landed in r171564: <http://trac.webkit.org/r171564>. 235463 2014-07-24 14:42:31 -0700 2014-07-24 17:18:44 -0700 the patch. bug-135258.patch text/plain 3576 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTcxNTI2KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQwIEBA CisyMDE0LTA3LTI0ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBK U1dyYXBwZXJNYXAncyBqc1dyYXBwZXJGb3JPYmplY3QoKSBuZWVkcyB0byBkZWZlciBHQy4KKyAg ICAgICAgPGh0dHBzOi8vd2Via2l0Lm9yZy9iLzEzNTI1OD4KKworICAgICAgICBSZXZpZXdlZCBi eSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJbiB0aGUgcHJvY2VzcyBvZiBjcmVhdGluZyBh IEpTIHdyYXBwZXIsIGpzV3JhcHBlckZvck9iamVjdCgpIHdpbGwgY3JlYXRlCisgICAgICAgIHRo ZSBwcm90b3R5cGUgYW5kIGNvbnN0cnVjdG9yIG9mIHRoZSBjb3JyZXNwb25kaW5nIE9iakMgY2xh 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