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Malte UblandClaude Opus 5.5
1689404912
Frame storage for non-escaping records was limited to number, boolean and
inline-union fields. Records with string, array, record or class fields,
tuples, and same-shape spread updates (`{ ...state, count }`) were always
heap-allocated, even when every use only projected them.
Closed record and tuple shapes now qualify regardless of field types. The
frame owns the reference fields: they start empty in entry-addressed slots
and are registered before anything is stored, with the binding's lexical
scope for locals and with the statement frame for call-argument
temporaries, so an exception while the record is being built releases
exactly what was stored. Interned string literal fields need no owner.
A reassigned binding builds the new value apart, copies it over its slot
and then releases the replaced fields. Result-slot entries cover producers
returning such records, tuples and spreads of a binding, and store into
the zeroed caller storage without releasing an old value. A spread of a
binding is a projection for the lifetime analysis. Published shapes and
switch-case bindings of reference-owning shapes keep heap storage.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>