The primary question is: Why do we save and restore what part of context.
Very good question:
*) System stack gets saved since we have important info on it. (Exception handlers when they're done, along with other control information)
*) User stack and register stacks, because all stacks need to be saved
*) Lexical pad pointer because we'll be entering (potentially) a new lexical scope and need to save the old one
*) Global namespace pointer since we have chained namespaces and the namespace chain for the sub we're using may not be the same as the sub we're calling
*) Opcode function table because we may have different opcode functions in the new sub
*) Current bytecode segment pointer since we may be entering a new bytecode segment with a new constant table and such
*) Interp flags (maybe, I'm not sure)
*) Warnings, since warnings are lexically scoped
*) Permission and privilege info (which we don't have yet)
I think that's about it, but there might be some more.
--
Dan--------------------------------------"it's like this"-------------------
Dan Sugalski even samurai
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teddy bears get drunk
