- SlotTables.h: BackendSlotTable<StateObject, BackendObject, kKind>, indexed by
MGPipeHandle::Slot and validated by Gen, with the handle minted by the client
MGPipeSlotAllocator off the frontend object GetLifetimeId(). A lookup is one bounds
check plus one array index, and unlike the registry Find it never mutates the table,
so a returned BackendPtr* is not invalidated by the next call on it.
- StateBackendObjectRegistry keeps its name, its signature and all ~40 call sites, and
becomes the two-arm facade ARCHITECTURE.md 9.6 asks for: the pre-handle map under
MOBILEGL_PIPE_LEGACY_MEMOS, the slot table under MOBILEGL_PIPE_PUSH, chosen once per
process by EsprytSlotTablesEnabled() off kMGPipeSubsystemEsprytSlots. A clear bit with
MOBILEGL_PIPE_LEGACY_MEMOS=0 leaves no arm at all and is Fatal{PipeLegacyMemosDisabled}.
- The kind is a template parameter only in the push build (MGB_TWIN_KIND_ARG): a third
template argument would rename every instantiation and G1 wants the pull build byte
identical. Pull-build symbol report is 0 added / 0 removed / 0 renamed and adds no
resize beyond the three RenderState symbols the contract commit already moved.
- ForEachLive replaces begin()/end() under push and hands the callee a strong reference
to the state object instead of the map key, which was the raw frontend address.
- Nothing switches over yet: the tables are built and reachable, and the twins still go
through whichever arm the bit selects.
Swung0x48