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POHow do I know when safe to ignore __cxa_throw on an All Exceptions breakpoint?
 

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  1. POHow do I know when safe to ignore __cxa_throw on an All Exceptions breakpoint?
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    <p>I am on Xcode 4.5.1. I think this is relatively new behavior I am seeing.</p> <p>I prefer to develop and test my projects with the "All Exceptions" breakpoint enabled.</p> <p>I have been running into a scenario where I am loading thumbnail images to cells in a tableview, where I am getting a __cxa_throw exception. When I click the "Continue program execution" button, Xcode continues its merry way. I get the thumbnails. App seems to work fine. I am looking for some tips on how I can determine if this is something safe to ignore. Like maybe some pointers on understanding the stack trace? Or something else?</p> <p>Here is the snippet of code:</p> <pre><code> NSString *imageStr = item.thumbURL; imageStr = [imageStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSURL *imageURL; if (![imageStr isEqualToString:@""]) { imageURL = [NSURL URLWithString:imageStr]; NSLog(@"imageURL: %@",imageURL); if (imageURL == nil) { NSLog(@"imageUrl was nil for string: %@",imageStr); } else { UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; //spinner.frame = CGRectMake(cell.imageView.frame.size.width/2,cell.imageView.frame.origin.y + cell.imageView.frame.size.height/2,cell.imageView.frame.size.width,cell.imageView.frame.size.height); spinner.frame = CGRectMake(10,20,40,40); [spinner startAnimating]; [cell addSubview:spinner]; dispatch_queue_t downloadQueue = dispatch_queue_create("thumbnail downloader", NULL); dispatch_async(downloadQueue, ^{ NSLog(@"Network request for tour_thumb image: %@",imageStr); UIImage *img = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:imageURL]]; dispatch_async(dispatch_get_main_queue(), ^{ [spinner removeFromSuperview]; UIImageView *imgView=[[UIImageView alloc] initWithFrame:CGRectMake(8, 8, cell.contentView.frame.size.width/2 - 16, cell.contentView.frame.size.height - 16)]; imgView.image = img; [cell.contentView addSubview:imgView]; }); }); dispatch_release(downloadQueue); } } </code></pre> <p>Here is what I see on the stack trace:</p> <pre><code>#0 0x34a9c524 in __cxa_throw () #1 0x387014ce in AddChildNode(XMP_Node*, XML_Node const&amp;, char const*, bool) () #2 0x38700d22 in RDF_LiteralPropertyElement(XMP_Node*, XML_Node const&amp;, bool) () #3 0x3870094e in RDF_PropertyElementList(XMP_Node*, XML_Node const&amp;, bool) () #4 0x38700608 in ProcessRDF(XMP_Node*, XML_Node const&amp;, unsigned int) () #5 0x3871480a in XMPMeta::ParseFromBuffer(char const*, unsigned int, unsigned int) () #6 0x387095c0 in WXMPMeta_ParseFromBuffer_1 () #7 0x38725578 in TXMPMeta&lt;std::string&gt;::ParseFromBuffer(char const*, unsigned int, unsigned int) () #8 0x387254de in TXMPMeta&lt;std::string&gt;::TXMPMeta(char const*, unsigned int) () #9 0x38722b70 in CreateMetadataFromXMPDataInternal(char const*, unsigned long, unsigned int) () #10 0x38739a50 in readXMPProperties () #11 0x386a01fc in readXMPData () #12 0x3868cec8 in initImageJPEG () #13 0x3868c2ee in _CGImagePluginInitJPEG () #14 0x3867e274 in makeImagePlus () #15 0x3867ddde in CGImageSourceCreateImageAtIndex () #16 0x38e117b6 in _UIImageRefFromData () #17 0x38e116c6 in -[UIImage initWithData:] () #18 0x0004cb0a in __57-[ViewController tableView:cellForRowAtIndexPath:]_block_invoke_0 at ViewController.m:335 #19 0x313fc792 in _dispatch_call_block_and_release () #20 0x313ffb3a in _dispatch_queue_drain () #21 0x313fd67c in _dispatch_queue_invoke () #22 0x31400612 in _dispatch_root_queue_drain () #23 0x314007d8 in _dispatch_worker_thread2 () #24 0x394767f0 in _pthread_wqthread () #25 0x39476684 in start_wqthread () </code></pre>
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