[gambit-list] Dumping the heap
feeley at iro.umontreal.ca
Thu Feb 1 08:16:28 EST 2018
> On Feb 1, 2018, at 8:06 AM, Dimitris Vyzovitis <vyzo at hackzen.org> wrote:
> thanks Guillaume!
> this is a great start for me -- i am helping fare debug a memory leak, and it's really hard to identify
> without dumping the heap to see what kind of object is leaking.
For your information I discovered a few memory leaks with the networking functions. They were due to “sockaddr” structures being converted to “still” Scheme objects with a reference count = 1, but the reference count was never decremented (with ___release_scmobj). This has been fixed in the recent UDP commit.
I believe that this kind of situation might exist in other places in the runtime system. So it might be useful to debug this to have a function that returns a list of all the “still” Scheme objects that have a reference count != 0. This should be easy to write… the GC maintains a list of the still objects in the C variable “still_objs”.
So the idea would be to check at the end of a program if there are any still objects with non-zero ref counts.
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