TODO
====

For next compiler release (7.2)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
make AnonymousScope no longer a INameScope as the vars are scoped to the parent subroutine.
requires to hoist all vardecls in all AnonymousScopes up to Subroutine level somewhere,
and changing all lookups that now look into the anonymousscope (no longer needed).
Do this after AstIdentifiersChecker so that we know that there are no problems with
variable name clashes.



Blocked by Commander-x16 v39 release
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- simplify cx16.joystick_get2() once this cx16 rom issue is resolved: https://github.com/commanderx16/x16-rom/issues/203
  (I hope this will still be included into the final v39 roms release for the cx16)


Future
^^^^^^
- get rid of all TODO's in the code
- improve testability further, add more tests, address more questions/issues from the testability discussions.
- replace certain uses of inferredType.getOr(DataType.UNDEFINED) by i.getOrElse({ errorhandler })
- see if we can remove more "[InferredType].getOr(DataType.UNDEFINED)"
- use more of Result<> and Either<> to handle errors/ nulls better
- fix the asm-labels problem (github issue #62)
- can we get rid of pieces of asmgen.AssignmentAsmGen by just reusing the AugmentableAssignment ? generated code should not suffer
- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
- optimize several inner loops in gfx2 even further?
- add modes 2 and 3 to gfx2 (lowres 4 color and 16 color)?
- add a flood fill routine to gfx2?
- add a diskio.f_seek() routine for the Cx16 that uses its seek dos api?
- make it possible for diskio to read and write from more than one file at the same time (= use multiple io channels)?
- refactor the asmgen into own project submodule
- refactor the compiler optimizers into own project submodule
- make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``v_``
- [problematic due to 64tass:] add a compiler option to not remove unused subroutines. this allows for building library programs. But this won't work with 64tass's .proc ...
  Perhaps replace all uses of .proc/.pend by .block/.bend will fix that?
  (but we lose the optimizing aspect of the assembler where it strips out unused code.
  There's not really a dynamic switch possible as all assembly lib code is static and uses one or the other)
- introduce byte-index operator to avoid index multiplications in loops over arrays?
  see https://www.reddit.com/r/programming/comments/alhj59/creating_a_programming_language_and_cross/eg898b9?utm_source=share&utm_medium=web2x&context=3


More code optimization ideas
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- a way to optimize if-statement codegen so that "if var & %10000" doesn't use stack & subroutine call, but also that the simple case "if X {...}" remains fast
- detect variables that are written but never read - mark those as unused too and remove them, such as ``uword unused = memory("unused222", 20)`` - also remove this memory slab allocation
- rewrite expression tree evaluation such that it doesn't use an eval stack but flatten the tree into linear code that uses a fixed number of predetermined value 'variables'
- this removes the need for the BinExprSplitter (which is problematic now)