[LLVMdev] Accurate garbage collection support
sabre at nondot.org
Tue May 25 12:01:01 PDT 2004
On Tue, 25 May 2004, Tobias Nurmiranta wrote:
> This is really nice, it supports my (somewhere-in-the-future) work with
> llvm, garbage collection and persistent memories.
> Can/Will one garbage collector be used for several different front-end
Yes, exactly. The GC interfaces are completely language agnostic.
> If so, don't you have to put functionality to traverse objects in the
> language implementation, since the internal representation depends on
> what language that is compiled. One language's internal representation
> for data could for example use a bit to define if a field is a pointer
> or an immediate value.
Exactly. There is (soon to be in CVS) a callback that the GC makes to
decode the language specific GC maps.
> Or does the collector know that it is Java code it's compiling, and
> therefore know that it should look for java type-tags on objects?
Java was just an example: we could also do scheme, CLR, *ML, etc.
Anything that is type-safe and needs a GC should be able to work.
> Otherwise it was a nice document, please say when you've implemented the
> trivial copying collector, which might answer my question. :)
Will do. :)
> On Mon, 24 May 2004, Chris Lattner wrote:
> > I recently added initial support for accurate GC to LLVM, as described in
> > this document:
> > http://llvm.cs.uiuc.edu/docs/GarbageCollection.html
> > I've started implementing a trivial copying collector as a testcase for
> > it, but it is not done yet. All code generators support identification of
> > roots on the stack though.
> > If you're interested in such things, I would really appreciate feedback on
> > the document, especially from front-end authors or garbage collection
> > implementor type-of-people.
> > Thanks,
> > -Chris
> > --
> > http://llvm.cs.uiuc.edu/
> > http://www.nondot.org/~sabre/Projects/
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