[Gc] Re: [PATCH] Allow registration of disappearing links on non-heapobjects

Ludovic Courtès ludo at gnu.org
Sun Feb 1 13:00:10 PST 2009


Hi,

Hans Boehm <Hans.Boehm at hp.com> writes:

> Ivan is right.  On some platforms it might work, but the collector
> does not assume that the heap is contiguous.  In fact, it's conceivable
> that dynamic libraries will be mapped between heap sections.  And the
> "plausible_heap_addr" bounds are intentionally generous, to include
> some potential future heap expansion.  (This helps black-listing of
> blocks that appear to be referenced from static data and the like.)
>
> This might even be an issue under Linux with large heaps on 32-bit
> systems, since the collector does eventually use mmap, which may
> interleave the heap with at least dlopened dynamic library data.  This
> may also interact with some of the address space randomization stuff.

Hmm, thanks for the advice!

Ludo'.



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