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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-6150) objc_msgSend causes EXC_BAD_ACCESS with plugins on arm64
Date Mon, 03 Mar 2014 23:20:20 GMT

    [ https://issues.apache.org/jira/browse/CB-6150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13918705#comment-13918705
] 

ASF subversion and git services commented on CB-6150:
-----------------------------------------------------

Commit 82ce4f249faf11f759cfd900974e7662c4c08688 in cordova-ios's branch refs/heads/master
from [~shazron]
[ https://git-wip-us.apache.org/repos/asf?p=cordova-ios.git;h=82ce4f2 ]

CB-6150 - objc_msgSend causes EXC_BAD_ACCESS with plugins on arm64


> objc_msgSend causes EXC_BAD_ACCESS with plugins on arm64
> --------------------------------------------------------
>
>                 Key: CB-6150
>                 URL: https://issues.apache.org/jira/browse/CB-6150
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: iOS
>    Affects Versions: 3.4.0
>         Environment: iOS 7.0.6 arm64
>            Reporter: Joris Verbogt
>            Assignee: Shazron Abdullah
>              Labels: core
>             Fix For: 3.5.0
>
>
> This bug was mentioned before in https://issues.apache.org/jira/browse/CB-5888
> The code in CDVCommandQueue line 197:
> objc_msgSend(obj, normalSelector, command);
> Causes a EXC_BAD_ACCESS on arm64.
> According to Apple's docs at https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/ConvertingYourAppto64-Bit/ConvertingYourAppto64-Bit.html
:
> An exception to the casting rule described above is when you are calling the objc_msgSend
function or any other similar functions in the Objective-C runtime that send messages. Although
the prototype for the message functions has a variadic form, the method function that is called
by the Objective-C runtime does not share the same prototype. The Objective-C runtime directly
dispatches to the function that implements the method, so the calling conventions are mismatched,
as described previously. Therefore you must cast the objc_msgSend function to a prototype
that matches the method function being called.
> This bug can be solved by explicit casting, like so:
> {code}
> ((void(*)(id, SEL, id))objc_msgSend)(obj, normalSelector, command);
> {code}



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