Cheney's algorithm: Difference between revisions

Revision as of 09:22, 22 March 2009

Revision as of 09:16, 5 March 2010

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Cheney's algorithm reclaims items as follows:

* '''ObjectsObject references on the stack.''' Object references on the stack are checked. One of the two following actions is taken for each object reference that points to an object in from-space:

** If the object has not yet been moved to the to-space, this is done by creating an identical copy in the to-space, and then replacing the from-space version with a forwarding pointer to the to-space copy. Then update the object reference to refer to the new version in to-space.

** If the object has already been moved to the to-space, simply update the reference from the forwarding pointer in from-space.

* '''Objects onin the to-space.''' The garbage collector examines all object references ''in the objects that have been migrated to the to-space'', and performs one of the above two actions on the referenced objects.

Once all to-space references have been examined and updated, garbage collection is complete.