[llvm-dev] (no subject)

Philip Reames via llvm-dev
Sat, 19 Oct 2019 20:35:38 -0000

Exactly this.  (As the person who wrote the line in question.)

On 10/18/19 8:50 AM, Hiroshi Yamauchi via llvm-dev
wrote:
> I think it's referring to a "moving" garbage collector (as
opposed to
> a "non-moving" garbage collector that never moves/relocates
objects.)
> The difference is that for a moving one, all pointers need to be
> tracked and potentially updated, whereas for a non-moving one, it's
> sufficient that at least one pointer to a live object is seen (when
> there may be other pointers to the same object elsewhere) for correctness.
>
> On Fri, Oct 18, 2019 at 2:12 AM Yafei Liu via llvm-dev
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at
lists.llvm.org>> wrote:
>
>     Hi all,
>
>     I'm investigating on integrating a gc to my llvm project, and when
>     I read this document <http://llvm.org/docs/Statepoints.html>, one
>     sentence confused me:
>
>         However, for a collector which wishes to relocate objects
>         directly reachable from running code, a higher standard is
>         required.
>
>     I don't understand what the move "relocate objects directly
>     reachable from running code" trying to do.
>
>     For my information, the concept "relocate" means the gc
pointer
>     refereed to a new location of an object, for example:
>
>     in Java:
>
>     |Foo foo = new Foo(); foo = new Foo(); // ---> a relocation happens
|
>
>     So can anyone explain what the "relocate objects directly
>     reachable from running code" trying to do?
>
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