Re: EXC_BAD_ACCESS when -fobjc-gc is on (Was: Memory corruption ...)

[Gabriel Zachmann]

Well, I did some more experimenting. Now I've got 2 issues ...





No matter where I put CFMakeCollectable(), or whether I use it at all.
Even with CGImageRelease() or CFRelease(), the leak persists.

This is one of the many variations I have tried:


 // [snip]
  imgLayer.contents = (id) cgImage;
 // [snip]
  CFMakeCollectable( cgImage );
  if ( [NSGarbageCollector defaultCollector] == NULL )
      CGImageRelease( cgImage );
  return imgLayer;

I can't think of any variation I have not tried.

In all cases, the app doesn't seem to crash any more, but it leaks.




At least, when I add the second layer, I get a crash immediately.
The second layer is basically this:


        textLayer_ = [[CALayer layer] retain];

        textLayer_.delegate = textlayer_delegate;       // TODO: direkt machen
        [mainLayer_ addSublayer: textLayer_ ];
        [textLayer_ setNeedsDisplay];

where TextLayerDelegate just exists for the drawLayer:inContext: method:

@interface TextLayerDelegate : NSObject { }

@end

@implementation TextLayerDelegate

{
    CGContextSetRGBStrokeColor( theContext, 0.0, 1.0, 1.0, 1.0 );       
    CGMutablePathRef thePath = CGPathCreateMutable();
    // ...
    CGContextStrokePath(theContext);    
    CFRelease(thePath);
}



I'm afraid I am still lost.


Best regards,
Gabriel.

First of all, I guess I should apologize, because my minimal example was not quite "minimal". There was one other layer, which I have removed now. Now the code sort of works in the GC world, *except* the memory footprint keeps growing. CGImageRef cgImage = CGImageSourceCreateImageAtIndex( sourceRef, 0, NULL ); The fact that it doesn't crash any more might be, of course, due to a different pattern of the underlying memory management. TextLayerDelegate * textlayer_delegate = [[[TextLayerDelegate alloc] init] retain]; textLayer_.bounds = NSRectToCGRect( [self bounds] ); // mainLayer_.bounds; - (void) drawLayer: (CALayer *) theLayer inContext: (CGContextRef) theContext; - (void) drawLayer: (CALayer *) theLayer inContext: (CGContextRef) theContext

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