prog8/docs/source/todo.rst
Irmen de Jong b5c5560af8 info
2019-08-11 18:21:15 +02:00

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====
TODO
====
Memory Block Operations integrated in language?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
list,string memory block operations?
- list operations (whole list, individual element)
operations: set, get, copy (from another list with the same length), shift-N(left,right), rotate-N(left,right)
clear (set whole list to the given value, default 0)
- list operations ofcourse work identical on vars and on memory mapped vars of these types.
- strings: identical operations as on lists.
these should call optimized pieces of assembly code, so they run as fast as possible
For now, we have the ``memcopy``, ``memset`` and ``strlen`` builtin functions.
Fixes
^^^^^
fix asmsub parameters so this works::
asmsub aa(byte arg @ Y) -> clobbers() -> () {
byte local = arg ; @todo fix 'undefined symbol arg' that occurs here
A=44
}
More optimizations
^^^^^^^^^^^^^^^^^^
Add more compiler optimizations to the existing ones.
- on the language AST level
- on the final assembly source level
- can the parameter passing to subroutines be optimized to avoid copying?
- subroutines with 1 or 2 byte args (or 1 word arg) should be converted to asm calling convention with the args in A/Y register
this requires rethinking the way parameters are represented, simply injecting vardecls to
declare local variables for them is not always correct anymore
- working subroutine inlining (taking care of vars and identifier refs to them)
Also some library routines and code patterns could perhaps be optimized further
Eval stack redesign? (lot of work)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The eval stack is now a split lsb/msb stack using X as the stackpointer.
Is it easier/faster to just use a single page unsplit stack?
It could then even be moved into the zeropage to greatly reduce code size and slowness.
Or just move the LSB portion into a slab of the zeropage.
Allocate a fixed word in ZP that is the TOS so we can always operate on TOS directly
without having to to index into the stack?
Misc
^^^^
Several ideas were discussed on my reddit post
https://www.reddit.com/r/programming/comments/alhj59/creating_a_programming_language_and_cross/