1) Opcode classes

perl5 hasn't really many different:  perldoc Opcode | grep '  :[a-z]*

- do we need base_loop? It's IMHO useless - turning off branching ops
will break any non-trivival program.

- do we expect to have more then 32 different classes?

Wanted:

A perl script that scans ops-files for opcode classes and spits out:

a) a pod with opcode classes headings and the list of opcodes that
belong to that class (at best created from a template, which has some
more explanation to that stuff)

b) a C include file that defines bitmask enums for the classes plus some
common shortcuts comming from a config file. These enums should then be
scanned during Configure and provide a user visible PASM in
runtime/parrot/include.
If we have more then 32 classes, we'll use a ParrotSet PMC (which will
be handy anyway)

2) Safe ops execution
There are basically 2 ways:
a) check in the compiler *and* in the PBC loader
b) check in the predereferencing code, which sees all opcodes anyway
immediately before execution and run Safe always through a prederefed
core. That can be CGP or for outermost safety (or when CGoto is missing)
the switched core.

3) Lexicals and globals
TBD (e.g. swap in a new global namespace hash, filled with user visible
items - or make a get_namespace like operation mandantory, which does
the rigth thing)

Thoughts, comments, patches welcome
leo