If a foreign pointer object corresponds to memory that was not allocated by the GC garbage collector, then a function to properly deallocate this memory when the Pointer object that stores this pointer is garbage collected should be called. The function should take a single argument, a foreign object, typically of type voidstar, which corresponds to the memory to deallocate.
i1 : malloc = foreignFunction("malloc", voidstar, ulong)
o1 = malloc
o1 : ForeignFunction
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i2 : free = foreignFunction("free", void, voidstar)
o2 = free
o2 : ForeignFunction
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i3 : finalizer = x -> (print("freeing memory at " | net x); free x)
o3 = finalizer
o3 : FunctionClosure
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i4 : for i to 9 do (x := malloc 8; registerFinalizer(x, finalizer))
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i5 : collectGarbage()
freeing memory at 0x7fcf700489c0
freeing memory at 0x7fcf7004f7e0
freeing memory at 0x7fcf7004f8a0
freeing memory at 0x7fcf7004f1e0
freeing memory at 0x7fcf7004f500freeing memory at 0x7fcf700075b0
freeing memory at 0x7fcf7004f850
freeing memory at 0x7fcf7004f870
freeing memory at 0x7fcf7004e9e0
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