Re: AppleScript - occasional crashes on Leopard

FROM : Michael Watson
DATE : Tue Apr 22 22:01:32 2008

Mark,

So GC + NSAppleScript == avoid for now?


--
m-s

On 22 Apr, 2008, at 15:53, Mark Piccirelli wrote:
> Is this a garbage-collected app? If so the crash is a known bug.
>
>                 -- Mark
>
> On Apr 22, 2008, at 10:47 AM, Steve Cronin wrote:

>> Folks;
>>
>> I've seen some inconsistent behavior on AppleScript running under 
>> Leopard.
>>
>> Here's an example:
>> ...
>>     NSString *theScript =@"some valid dynamic script text"
>>     NSDictionary *errorDict = [NSDictionary dictionary];
>>     NSAppleScript *appleScriptObject = [[NSAppleScript alloc] 
>> initWithSource:theScript];    
>>     NSAppleEventDescriptor *eventDescriptor = [appleScriptObject 
>> executeAndReturnError: &errorDict];
>> ...
>>
>> will OCCASIONALLY crash at the NSAppleEventDescriptor specification:
>>
>> #0    0x932c3d5c in getDescDataType
>> #1    0x932c7ab7 in aeCoerceDescInternal
>> #2    0x932cc055 in AECoerceDesc
>> #3    0x1d4a8150 in ComponentCoerceDesc
>> #4    0x1d48cbec in ASCompile
>> #5    0x903bacb8 in CallComponentFunction
>> #6    0x1d487ae2 in AppleScriptComponent
>> #7    0x1d4a3927 in AGenericManager::HandleOSACall
>> #8    0x903755cd in CallComponentDispatch
>> #9    0x953fc513 in OSACompile
>> #10    0x93e6edaf in -[NSAppleScript compileAndReturnError:]
>> #11    0x93e6f096 in -[NSAppleScript(NSPrivate) 
>> _executeWithMode:andReturnError:]
>> #12    0x93e6ee51 in -[NSAppleScript executeAndReturnError:]
>>
>> Is there a new/better means in Leopard of accomplishing the 
>> execution of dynamic scripts?
>> NO the crash is NOT related to the validity of the script, of this 
>> I am absolutely certain!  (It only crashes sometimes using the same 
>> resulting script!!)
>> Is a dual processor Intel creating a risk here?
>> Is there something better I can do to handle the error?
>> Why should I have to use a @try block here?
>> I thought that was what the executeAndReturnError  parameter was 
>> for!!  But I don't get a chance to examine the errorDict.
>>
>> It will crash only every so often....
>> My hunch is that crashes are more likely when machine is under load 
>> and memory swapping might be involved.
>> This is running on a 4G MacBook...
>>
>> Any wisdom appreciated!
>> Steve
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