MMTk 0.14.0

API

• ProcessEdgesWork is no longer exposed in the Scanning trait. Instead, RootsWorkFactory is introduced
  for the bindings to create more work packets.
• Collection::stop_all_mutators() now provides a callback mutator_visitor. The implementation is required
  to call mutator_visitor for each mutator once it is stopped. This requirement was implicit prior to this change.
• Now MMTk creation is done in the builder pattern:
  • MMTKBuilder is introduced. Command line argument processing API (process() and process_bulk()) now
    takes &MMTKBuilder as an argument instead of &MMTK.
  • gc_init() is renamed to mmtk_init(). mmtk_init() now takes &MMTKBuilder as an argument,
    and returns an MMTk instance Box<MMTK>.
  • heap_size (which used to be an argument for gc_init()) is now an MMTk option.
  • All the options now can be set through the command line argument processing API.
• Node enqueuing is supported:
  • Add Scanning::support_edge_enqueuing(). A binding may return false if they cannot do edge scanning for certain objects.
  • For objects that cannot be enqueued as edges, Scanning::scan_object_and_trace_edges() will be called.

Scheduler

• Fixed a bug that may cause deadlock when GC workers are parked and the coordinator is still executing work.

Misc

• Plan::gc_init() and Space::init() are removed. Initialization is now properly done in the respective constructors.