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95 lines
6.2 KiB
ReStructuredText
95 lines
6.2 KiB
ReStructuredText
TODO
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====
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For next release
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^^^^^^^^^^^^^^^^
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- ir: asmsub contents remains blank in IR file
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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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- create BSS section in output program and put StStaticVariables in there with bss=true. Don't forget to add init code to zero out everything that was put in bss. If array in bss->only zero ONCE! So requires self-modifying code
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- ir: Jumps go to a code block rather than a specific address(label) -> also helps future dead code elimination?
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- ir: add more optimizations in IRPeepholeOptimizer
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- ir: how to remove all unused subroutines? (the 6502 assembly codegen relies on 64tass solve this for us)
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- see if we can let for loops skip the loop if end<start, like other programming languages. Without adding a lot of code size/duplicating the loop condition.
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this is documented behavior to now loop around but it's too easy to forget about!
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Lot of work because of so many special cases in ForLoopsAsmgen.....
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How is it for the vm target? -> just 2 special cases in CodeGen.
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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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- generate WASM to eventually run prog8 on a browser canvas?
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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 with a compiler flag?
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But all library code written in asm uses .proc already..... (search/replace when writing the actual asm?)
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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 and faster indexing
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- ast: don't rewrite by-reference parameter type to uword, but keep the original type (str, array)
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BUT that makes the handling of these types different between the scope they are defined in, and the
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scope they get passed in by reference... unless we make str and array types by-reference ALWAYS?
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BUT that makes simple code accessing them in the declared scope very slow because that then has to always go through
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the pointer rather than directly referencing the variable symbol in the generated asm....
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Or maybe make codegen smart to check if it's a subroutine parameter or local declared variable?
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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 3 and perhaps even 2 to gfx2 (lores 16 color and 4 color)?
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- add a flood fill (span fill/scanline fill) routine to gfx2?
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Expressions:
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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 such that it doesn't use an eval stack but flatten the tree into linear code
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that, for instance, uses a fixed number of predetermined value 'variables'?
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The VM IL solves this already (by using unlimited registers) but that still lacks a translation to 6502.
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- this removes the need for the BinExprSplitter? (which is problematic and very limited now)
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and perhaps the assignment splitting in BeforeAsmAstChanger too
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Optimizations:
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- various optimizers skip stuff if compTarget.name==VMTarget.NAME. When 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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- when a loopvariable of a forloop 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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- optimize function argument expressions better (use temporary variables to replace non-simple expressions?)
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STRUCTS again?
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--------------
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What if we were to re-introduce Structs in prog8? Some thoughts:
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- can contain only numeric types (byte,word,float) - no nested structs, no reference types (strings, arrays) inside structs
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- is just some syntactic sugar for a scoped set of variables -> ast transform to do exactly this before codegen. Codegen doesn't know about struct.
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- no arrays of struct -- because too slow on 6502 to access those, rather use struct of arrays instead.
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can we make this a compiler/codegen only issue? i.e. syntax is just as if it was an array of structs?
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or make it explicit in the syntax so that it is clear what the memory layout of it is.
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- ability to assign struct variable to another? this is slow but can be quite handy sometimes.
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however how to handle this in a function that gets the struct passed as reference? Don't allow it there? (there's no pointer dereferencing concept in prog8)
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- ability to be passed as argument to a function (by reference)?
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however there is no typed pointer in prog8 at the moment so this can't be implemented in a meaningful way yet,
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because there is no way to reference it as the struct type again. (current ast gets the by-reference parameter
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type replaced by uword)
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So-- maybe don't replace the parameter type in the ast? Should fix that for str and array types as well then
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