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feat(SwingSet): add "reachable" flag to clist entries #3130

Merged
merged 2 commits into from
May 21, 2021
Merged

feat(SwingSet): add "reachable" flag to clist entries #3130

merged 2 commits into from
May 21, 2021

Commits on May 21, 2021

  1. fix(SwingSet): enable getKeys('','') in blockBuffer/crankBuffer 

    Previously, these two wrappers didn't provide the same functionality as their
underlying HostStorage: you couldn't use empty strings for the start/end to
get more keys.

Also, add type assertions to crankBuffer to detect non-string keys/values
earlier than commitCrank.
    @warner
    warner committed May 21, 2021
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  2. feat(SwingSet): add "reachable" flag to clist entries 

    The kernel-to-vat clist entry for `kref` is stored in the kernelDB under a
key of `${vatID}.c.${kref}` . This changes the value at that key from
`${vref}` to `${flag} ${vref}`, where `flag` is either `R` (for "reachable
and recognizable") or `_` (for "recognizable but not reachable). The "neither
reachable nor recognizable" state simply deletes the clist entry altogether.

This adds vatKeeper methods to set and clear the flag on a given kref. These
will be used by the GC syscall handlers for dropImport and friends.

closes #3108
    @warner
    warner committed May 21, 2021
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