[linuxnow]

From omx-clap-host 0.26.2 (omx-clap-core#449), a worker saves and restores the callee-saved registers around every plugin call. When a plugin returns with one changed, the worker writes abi_clobber <instance> <mask> <registers> <call> <block> once on its feedback port. Its own frame is whole after the restore. The other members' state in the same process is not covered, so the ruling is: such a plugin runs only in a worker of its own.

The daemon now acts on that line:

• Relay: keeps the instance number of each abi_clobber line for the supervisor. The line still goes to the controller as written.
• Tick: quarantines the instance (instance_quarantined, and the history keeps it alone from then on).
  • If it shares its worker or is in a chain, it moves to a worker of its own (to_own: checkpoint, remove, respawn) with its state.
  • The other members stay in the same process.
  • One already alone is only marked, and is not moved or announced again.
• Docs: abi_clobber is declared in the events table, with README and protocol JSON regenerated.

Red first: 4bbfd2b. The fake host's param_set <n> abi_clobber 1 writes the worker's line. The test pools three members and makes one report:

• before the change it timed out on instance_quarantined;
• now that member runs alone with its gain kept, the pool keeps the other two in the same pid, and a second report while alone moves nothing.
• Full daemon suite in the worker image: ok, 0 failed.