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From "Joris Verbogt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-6150) objc_msgSend causes EXC_BAD_ACCESS with plugins on arm64
Date Mon, 03 Mar 2014 09:17:21 GMT
Joris Verbogt created CB-6150:
---------------------------------

             Summary: 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


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:

((void(*)(id, SEL, id))objc_msgSend)(obj, normalSelector, command);





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