b9.org

Road Map

OMR Cleanup

Minor Tasks

Force set the glue component names

Port visitor scheme to OMR Marking

Remove OMR’s object iterator code

Single transitionSet opimization

• More than just an opti
• Delay allocating the transition table potentially means less rooting during object map allocation

Version 1: Basic object features

Transition Tables

Fixed / Dynamic Slots

Split high-level public api from low-level

Write barriers

Finalization

• List of objects and finalizers
• Finalization calls are dispatched to threads

Expose OMR thread dispatch library to language

• Possibly expose OMR work-sharing API so languages can work out their own multithreadedness in Finalization
• Reuse the GC’s work dispatcher for finalization

Version 2: Java-style classes

Typed, variable width slots

Fat Object Maps

• Merge SlotMap, ObjectMap, EmptyObjectMap to one type.

Version 3: Jit

Jit Integration

Version 4: Arrays

Array Objects

Version 5: Threading and atomics

Atomic sets/gets

Object Locks

Shared heap lock

Version 6

Constructors and construction sites

Slack Tracking

Root Constructors

Version 7: Dictionary Objects

Dictionary Objects

Problems

Rooting

Rooting through Value-slots

Rooting a prexisting pointer sloti

“`

for (const Map& map : object->mapHierachy()) { for (const SlotLookup& slot : map->slotRange()) { switch(slot.desc.type().coreType()) { case CoreType::REF: edge.mark() case CoreType::VALUE: return handleValue(); } object->access(slot);

} }