cotto

per-callframe constants segment layout:

constants segment starts with a list of fixed-width pointers.  I/N entries are stored directly.  S/P entries are pointers to later in the constants segment
The data segment has a couple options.  It can be appended after the constants segment (either on the next page or immediately after), with the constants data being marked read-only.  Alternately, it can just be another segment attached to a special register.

If callframes are analogous to subs, the constants and data segment can be analogous to lexical data.

If callframes are analogous to subs, how will recursion work?
 * clone a callframe (when?  before entering ( -> no state) or after entering (less waste, leftover state))
 * need to work out calling conventions