feat(bex): complete garbage collector implementation - #3003
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Complete the BEX garbage collector by closing 5 identified gaps: - Gap 1: Parked VM roots now collected via VM pointer registry - Gap 2: VM stacks updated with forwarding pointers after GC - Gap 3: TLABs invalidated after GC space swap - Gap 6: Handle race condition fixed with EpochGuard Key changes: - Add parked_vms registry to EpochState for tracking VMs at safepoints - Collect roots from all parked VM stacks during GC - Update parked VM stacks with forwarding pointers after copying - Remove cached ObjectIndex from Handle (always resolve through table) - Add gc_in_progress flag to synchronize new calls with GC - Add EpochGuard token for compile-time epoch protection enforcement - Add heap accessor API for safe external code access (read_string, etc.) - Add GC coordination documentation to module docs
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Summary
Complete the BEX garbage collector implementation by closing 5 identified gaps in the engine-level integration:
Key Changes
VM Pointer Registry (Phase 1-2)
parked_vms: Mutex<Vec<VmPtr>>toEpochStatefor tracking VMs at safepointsStack Updates & TLAB Invalidation (Phase 3)
collect_garbage_with_forwarding()that returns the forwarding mapHandle Race Condition Fixes (Phase 4)
ObjectIndexfromHandle- always resolve through tablegc_in_progressflag to synchronize new calls with GCcall_functioninvocations wait for in-progress GC before resolving handlesEpochGuard & Accessor API (Phase 6)
EpochGuardtoken type for compile-time epoch protection enforcementHandle::object_index()now requires&EpochGuard<'_>parameterread_string,read_array,with_object) for safe external accessDocumentation & Tests (Phase 5)
test_gc_updates_forwarding_pointers,test_multiple_handles_survive_gcTest plan
cargo build -p bex_engine -p bex_heap -p bex_external_typescompilescargo test -p bex_engine- all tests pass (including 5 GC tests)cargo test -p bex_heap- 28 tests passcargo test -p bex_external_types- all tests passcargo clippypasseshandle.object_index()without guard fails to compile🤖 Generated with Claude Code