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90 lines
7.0 KiB
ReStructuredText
90 lines
7.0 KiB
ReStructuredText
TODO
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====
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For next release
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^^^^^^^^^^^^^^^^
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- vm: allow inline "asm" where the assembly is vm-code instead of 6502 -- then get rid of the syscall() functions in prog8
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- vm: implement missing floating point functions
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- pipe operator: allow non-unary function calls in the pipe that specify the other argument(s) in the calls.
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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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- 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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If we can do that why not perhaps also able to inline multi-line subroutines? Why would it be limited to just 1 line? Maybe to protect against code size bloat.
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Inlined subroutines cannot contain further nested subroutines!
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Once this works, look for library subroutines that should be inlined.
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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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- atari target: more details details about the machine, fixing library routines. I have no clue whatsoever.
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- see the :ref:`portingguide` for details on what information is needed.
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Future Things and Ideas
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^^^^^^^^^^^^^^^^^^^^^^^
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Compiler:
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- vm: codeGen: various TODOs to tweak code
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- vm: make registers typed? so that it's immediately obvious what type they represent. Much like regular variables in memory.
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so we have a set of byte registers, a set of word registers, and other sets if we introduce other types.
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- vm: don't store symbol names in instructions to make optimizing the IR easier? but what about jumps to labels. And it's no longer readable by humans.
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- vm: how to remove all unused subroutines? (in the assembly codegen, we let 64tass solve this for us)
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- vm: rather than being able to jump to any 'address' (IPTR), use 'blocks' that have entry and exit points -> even better dead code elimination possible too
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- when the vm is stable and *if* its language can get promoted to prog8 IL, the variable allocation should be changed.
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It's now done before the vm code generation, but the IL should probably not depend on the allocations already performed.
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So the CodeGen doesn't do VariableAlloc *before* the codegen, but as a last step.
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- vm code gen: don't reuse registers and don't pre allocate variables? (except strings + arrays) but instead put them into registers too
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then we ALMOST have Static Single Assignment form in the VM code. But what can we use that for?
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- createAssemblyAndAssemble(): make it possible to actually get rid of the VarDecl nodes by fixing the rest of the code mentioned there.
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but probably better to rewrite the 6502 codegen on top of the new Ast.
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- make everything an expression? (get rid of Statements. Statements are expressions with void return types?).
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- simplifyConditionalExpression() should not split expression if it still results in stack-based evaluation, but how does it know?
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- simplifyConditionalExpression() sometimes introduces needless assignment to r9 tempvar (what scenarios?)
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- consider adding McCarthy evaluation to shortcircuit and/or expressions. First do ifs by splitting them up? Then do expressions that compute a value?
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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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- [problematic due to using 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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- Zig-like try-based error handling where the V flag could indicate error condition? and/or BRK to jump into monitor on failure? (has to set BRK vector for that)
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- add special (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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Libraries:
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- fix the problems in c128 target, and flesh out its libraries.
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- fix the problems in atari target, and flesh out its libraries.
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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? (only if that's stable)
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- use cx16 MACPTR() to load stuff faster?
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Expressions:
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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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- rewrite expression tree evaluation suchthat 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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Optimizations:
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- various optimizers skip stuff if compTarget.name==VMTarget.NAME. Once (if?) 6502-codegen is no longer done from
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the old CompilerAst, those checks should probably be removed, or be made permanent
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- VariableAllocator: can we think of a smarter strategy for allocating variables into zeropage, rather than first-come-first-served
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- translateUnaryFunctioncall() 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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compare ``aa = startvalue(1) |> sin8u() |> cos8u() |> sin8u() |> cos8u()``
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versus: ``aa = cos8u(sin8u(cos8u(sin8u(startvalue(1)))))`` the second one contains no sta cx16.r9L in between.
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- AssignmentAsmGen.assignExpression() -> 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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but we have no efficient way right now to see if the body references a variable.
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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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- introduce byte-index operator to avoid index multiplications in loops over arrays? see github issue #4
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