Nate Chandler edab098067 [runtime] Metadata can be flagged static. ...

Added a new flag to the GenericMetadataPatternFlags flagset for whether
the metadata has a set of flags at its tail.  When that flag is set,
there will be an extra uint64_t flagset at the end of the metadata.  For
struct metadata, the type of that flagset will be
StructMetadataTrailingFlags.  The first flag in that trailing flagset
indicates whether the metadata was statically specialized.  The second
flag in that trailing flagset indicates whether the metadata is
statically canonical.

When verifying the metadata cache, a check is done for whether the
metadata was statically specialized and whether it was known to be
canonical statically.  If so, verification is skipped.  Skipping it is
necessary because the known-canonical statically specialized metadata
will not be in the cache.  In that case, the canonical statically
specialized metadata will be returned from the metadata accessor and
never be cached.

2020-01-09 17:25:31 -08:00

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