Dynamic Array Garbage collection

Robert Fraser fraserofthenight at gmail.com
Thu Mar 12 02:46:26 PDT 2009

wolftousen wrote:
> I have a function defined as:
> some_function(int[] array) { ... };  //this function does not ever modify values of array
> When I call this function (once every program cycle) from an object using an array of type short:
> //member variable in an object
> short[] x = new short[4];
> //object calls this
> some_function([ x[0], x[1], x[2], x[3] ]);
> After a few seconds of the program running, x[0] and x[1] values are set to 0 and a couple values of another array in the object are modified as well.
> I have found that this bug is corrected by calling delete at the end of some_function of the variable array.  This tells me that the garbage collector is acting funny if I do not call delete on the array.  (I have watched the memory usage of the program and it doesn't fluctuate or pause or anything to signal the freeing/allocating of memory....)
> Any Idea what is going on?

Can you use obj2asm and post the assembly of both functions? I'm 
guessing DMD is doing some kind of weird optimization with the array 
literal allocation.

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