[opensource-dev] Review Request: patch potential memory leak in llgl.h

[Gistya Eusebio]

> On Sept. 19, 2012, 2:12 p.m., Aleric Inglewood wrote:
> > There is semi-colon where it doesn't belong. Otherwise ok (Singularity has this patch since a long time).

Oh really, where? It compiled and ran fine on my machine.


- Gistya


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On Sept. 19, 2012, 8:26 a.m., Gistya Eusebio wrote:
> 
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> http://codereview.secondlife.com/r/603/
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> 
> (Updated Sept. 19, 2012, 8:26 a.m.)
> 
> 
> Review request for Viewer.
> 
> 
> Description
> -------
> 
> In llvertexbuffer.cpp we call: delete mFence;
> 
> mFence is an instance of class LLGLSyncFence which is a sub-class of LLGLFence, which is defined in llgl.h.
> 
> However, class LLGLFence should have a virtual destructor because it's the base class. This patch fixes that potential memory leak, adding a virtual destructor to class LLGLFence. The virtual destructor ensures that the destructor for the derived class also gets called when we call "delete mfence;".
> 
> To quote Björn Pollex, "If you have a class that is supposed to be usable polymorphically, it should also be deletable polymorphically." 
> 
> (Unless I'm missing something...!)
> 
> NOTE: I notice that related code is commented in methods "void LLVertexBuffer::placeFence() const" and "void LLVertexBuffer::waitFence() const" -- maybe we commented it out because this memory leak was unresolved? Perhaps it can be uncommented now? I haven't tried yet. There was no note as to why the code is commented out.
> 
> 
> Diffs
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> 
>   indra/llrender/llgl.h UNKNOWN 
> 
> Diff: http://codereview.secondlife.com/r/603/diff/
> 
> 
> Testing
> -------
> 
> I did compile this with OS X 10.8 as a build target successfully. I made other changes too, so while my FPS seems improved, it could be from any number of issues. I did notice that any llCharacters that are moving around don't get rendered properly by my build, but I don't know if it's because of this code revision or something else. I need to do further testing on that.
> 
> 
> Thanks,
> 
> Gistya Eusebio
> 
>

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