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 0xffff8004f5f0
freeing memory at 0xffff80048a30
freeing memory at 0xffff80048a10
freeing memory at 0xffff8004f5d0
freeing memory at 0xffff8004fe60
freeing memory at 0xffff8004ff20
freeing memory at 0xffff8004f860
freeing memory at 0xffff8004f880
freeing memory at 0xffff8004f630
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