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80 lines
5.9 KiB
ReStructuredText
80 lines
5.9 KiB
ReStructuredText
TODO
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====
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For next release
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^^^^^^^^^^^^^^^^
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...
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Need help with
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^^^^^^^^^^^^^^
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- c128 target: various machine specific things (free zp locations, how banking works, getting the floating point routines working, ...)
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- other targets such as Atari 800XL: all required details about the machine, I have no clue whatsoever
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- see the :ref:`portingguide` for details on what information is needed.
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Blocked by an official Commander-x16 r39 release
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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- simplify cx16.joystick_get2() once this cx16 rom issue is resolved: https://github.com/commanderx16/x16-rom/issues/203
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(I hope this will be included into the r39 roms when they get released)
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Future Things and Ideas
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^^^^^^^^^^^^^^^^^^^^^^^
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Ast modifications done in AsmGen, that should be done BEFORE calling asmgen (so that it doesn't have to modify the Ast any longer):
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- translateSubroutine:
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if subroutine marked as inline but optimizations are disabled, make sure the NOT INLINED subroutine actually has a Return statement at the end
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- block2asm:
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if(options.dontReinitGlobals) -> currently modifies the zeropage and init value of vardecl's.
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it removes init-assignments to no longer output the initialization assignments as regular statements (is done separately in block initialization routine)
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after vardecls2asm it clears the vardecl.value of all variables (why?)
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- Maybe don't rely on vardecls at all any longer but figure out the variable allocations (including ZP allocations) beforehand
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and pass that via a new datastructure to asmgen? So that asmgen is no longer tasked with doing the allocations.
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This could perhaps make it easer for the codegen as well to deal with sections, if any, in the future.
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- remove support for old @"screencodes" string encoding syntax (parser+code+docs)
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- allow "xxx" * constexpr (where constexpr is not a number literal), now gives expression error not same type
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- unify FunctioncallExpression + FunctioncallStatement and PipeExpression + Pipe statement classes, may require moving Expression/Statement into interfaces instead of abstract base classes
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- for the pipe operator: recognise a placeholder (``?`` or ``%`` or ``_``) in a non-unary function call to allow non-unary functions in the chain; ``4 |> mkword(?, $44) |> print_uw``
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- for the pipe operator: make it 100% syntactic sugar so there's no need for asm codegen like translatePipeExpression
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- make it possible to inline non-asmsub routines that just contain a single statement (return, functioncall, assignment)
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but this requires all identifiers in the inlined expression to be changed to fully scoped names
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- simplifyConditionalExpression() should not split expression if it still results in stack-based evaluation
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- simplifyConditionalExpression() sometimes introduces needless assignment to r9 tempvar
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- consider adding McCarthy evaluation to shortcircuit and and or expressions. First do ifs by splitting them up? Then do expressions that compute a value?
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- use more of Result<> and Either<> to handle errors/ nulls better?
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- rethink the whole "isAugmentable" business. Because the way this is determined, should always also be exactly mirrorred in the AugmentableAssignmentAsmGen or you'll get a crash at code gen time.
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- can we get rid of pieces of asmgen.AssignmentAsmGen by just reusing the AugmentableAssignment ? generated code should not suffer
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- make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``p8v_``? Or not worth it (most 3 letter opcodes as variables are nonsensical anyway)
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then we can get rid of the instruction lists in the machinedefinitions as well?
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- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
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- optimize several inner loops in gfx2 even further?
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- add modes 2 and 3 to gfx2 (lowres 4 color and 16 color)?
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- add a flood fill routine to gfx2?
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- add a diskio.f_seek() routine for the Cx16 that uses its seek dos api?
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- make it possible for diskio to read and write from more than one file at the same time (= use multiple io channels)?
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- fix problems in c128 target
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- add (u)word array type (or modifier?) that puts the array into memory as 2 separate byte-arrays 1 for LSB 1 for MSB -> allows for word arrays of length 256
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- [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 ...
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Perhaps replace all uses of .proc/.pend by .block/.bend will fix that?
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(but we lose the optimizing aspect of the assembler where it strips out unused code.
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There's not really a dynamic switch possible as all assembly lib code is static and uses one or the other)
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- get rid of all TODO's in the code ;)
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More optimization ideas
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^^^^^^^^^^^^^^^^^^^^^^^
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- translateFunctioncall() in BuiltinFunctionsAsmGen: should be able to assign parameters to a builtin function directly from register(s), this will make the use of a builtin function in a pipe expression more efficient without using a temporary variable
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- translateNormalAssignment() -> better code gen for assigning boolean comparison expressions
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- when a for loop's loopvariable isn't referenced in the body, and the iterations are known, replace the loop by a repeatloop
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- automatically convert if statements that test for multiple values (if X==1 or X==2..) to if X in [1,2,..] statements, instead of just a warning.
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- 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'?
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"Three address code" was mentioned. https://en.wikipedia.org/wiki/Three-address_code
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these variables have to be unique for each subroutine because they could otherwise be interfered with from irq routines etc.
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- this removes the need for the BinExprSplitter? (which is problematic and very limited now)
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and perhaps as well the assignment splitting in BeforeAsmAstChanger too
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- introduce byte-index operator to avoid index multiplications in loops over arrays? see github issue #4
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