Re: Crash with latest libobjc2 and base with clang 3.3

[Doug Warren]

It looks like it's much lower level than that:

#import <Foundation/Foundation.h>

int main()

{

    @autoreleasepool {

    NSString *testString = nil;

    testString = [NSString stringWithUTF8String:"Hello World"];

    NSMutableArray* arr = [NSMutableArray arrayWithObject:testString];

    [arr addObject:testString];

    int length = [arr count];

    printf("The length: %d\n", length);

    }

}

The length: 0

On Thu, Jul 25, 2013 at 4:46 AM, David Chisnall <address@hidden> wrote:

If it's crashing in the message send, then it is most likely that it is sending an invalid message.

Because this is a +load method, it may be that the class in question is not yet loaded.  It is undefined behaviour to refer to any classes that are not superclasses of the current class in a +load method, so this looks like a bug.

David

On 25 Jul 2013, at 02:40, Doug Warren <address@hidden> wrote:

> After David's suggestion last week with property meta data being lost without the latest objc2 and clang, I rebuilt everything around -fobjc-runtime=gnustep-1.7 and clang3.3, but now I crash with invoking a +load:
>
> #0  0x4caf1880 in objc_msgSend_fpret () from /data/testnations.git/android/obj/local/armeabi-v7a/libobjc.so
> #1  0x4de0e23c in +[UIImage(UIPrivate) load] (self=0x4e338990, _cmd=0x2a16c330) at /data/test.git/lib/ZIKit//UIKit/UIImage+UIPrivate.m:41
> #2  0x4caf2224 in objc_send_load_message (class=0x4e338990) at class_table.c:58
> #3  0x4caf31fc in objc_resolve_class (cls=0x4e338990) at class_table.c:249
> #4  0x4caf3350 in objc_resolve_class_links () at class_table.c:269
> #5  0x4caf8250 in __objc_exec_class (module=<optimized out>) at loader.c:133
> #6  0x4de11e98 in .objc_load_function () from /data/test.git/android/obj/local/armeabi-v7a/libTest.so
> #7  0x40003274 in _start () from /data/test.git/android/obj/local/armeabi-v7a/linker
> #8  0x400050ce in ?? () from /data/test.git/android/obj/local/armeabi-v7a/linker
>
> The line in question is:
>     imageCache = [NSMutableDictionary alloc];
>
> So I assume it is something incredibly basic, but as it's calling into an arm assembly function I don't really have the expertise to debug it.  Any assistance or pointers would be appreciated.
>
>

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