mirror of
https://github.com/irmen/prog8.git
synced 2024-11-05 10:05:00 +00:00
101 lines
6.7 KiB
ReStructuredText
101 lines
6.7 KiB
ReStructuredText
TODO
|
|
====
|
|
|
|
For next minor release
|
|
^^^^^^^^^^^^^^^^^^^^^^
|
|
...
|
|
|
|
|
|
For 9.0 major changes
|
|
^^^^^^^^^^^^^^^^^^^^^
|
|
- duplicate diskio for cx16 (get rid of cx16diskio, just copy diskio and tweak everything) + documentation
|
|
- get f_seek_w working like in the BASIC program - this needs the changes to diskio.f_open to use suffixes ,p,m
|
|
- Some support for (64tass) SEGMENTS ?
|
|
- Add a mechanism to allocate variables into golden ram (or segments really) (see GoldenRam class)
|
|
- maybe treat block "golden" in a special way: can only contain vars, every var will be allocated in the Golden ram area?
|
|
- the variables can NOT have initialization values, they will all be set to zero on startup (simple memset)
|
|
just initialize them yourself in start() if you need a non-zero value
|
|
- OR.... do all this automatically if 'golden' is enabled as a compiler option? So compiler allocates in ZP first, then Golden Ram, then regular ram
|
|
- OR.... make all this more generic and use some %segment option to create real segments for 64tass?
|
|
- (need separate step in codegen and IR to write the "golden" variables)
|
|
|
|
|
|
Need help with
|
|
^^^^^^^^^^^^^^
|
|
- c128 target: various machine specific things (free zp locations, how banking works, getting the floating point routines working, ...)
|
|
- atari target: more details details about the machine, fixing library routines. I have no clue whatsoever.
|
|
- see the :ref:`portingguide` for details on what information is needed.
|
|
|
|
|
|
Future Things and Ideas
|
|
^^^^^^^^^^^^^^^^^^^^^^^
|
|
Compiler:
|
|
|
|
- ir: mechanism to determine for chunks which registers are getting input values from "outside"
|
|
- ir: mechanism to determine for chunks which registers are passing values out? (i.e. are used again in another chunk)
|
|
- ir: peephole opt: renumber registers in chunks to start with 1 again every time (but keep entry values in mind!)
|
|
- ir: peephole opt: reuse registers in chunks (but keep result registers in mind that pass values out! and don't renumber registers above SyscallRegisterBase!)
|
|
- ir: add more optimizations in IRPeepholeOptimizer
|
|
- ir: for expressions with array indexes that occur multiple times, can we avoid loading them into new virtualregs everytime and just reuse a single virtualreg as indexer?
|
|
- vm: somehow be able to load a label address as value? (VmProgramLoader) this may require storing the program in actual memory bytes though...
|
|
- 6502 codegen: see if we can let for loops skip the loop if startvar>endvar, without adding a lot of code size/duplicating the loop condition.
|
|
It is documented behavior to now loop 'around' $00 but it's too easy to forget about!
|
|
Lot of work because of so many special cases in ForLoopsAsmgen..... (vm codegen already behaves like this)
|
|
- ir: can we determine for the loop variable in forloops if it could be kept in a (virtual) register instead of a real variable? Need to be able to check if the variable is used by another statement beside just the for loop.
|
|
- generate WASM to eventually run prog8 on a browser canvas?
|
|
- [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 ...
|
|
Perhaps replace all uses of .proc/.pend by .block/.bend will fix that with a compiler flag?
|
|
But all library code written in asm uses .proc already..... (search/replace when writing the actual asm?)
|
|
Once new codegen is written that is based on the IR, this point is moot anyway as that will have its own dead code removal.
|
|
- 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)
|
|
- 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
|
|
|
|
|
|
Libraries:
|
|
|
|
- fix the problems in c128 target, and flesh out its libraries.
|
|
- fix the problems in atari target, and flesh out its libraries.
|
|
- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
|
|
- optimize several inner loops in gfx2 even further?
|
|
- add modes 3 and perhaps even 2 to gfx2 (lores 16 color and 4 color)?
|
|
- add a flood fill (span fill/scanline fill) routine to gfx2?
|
|
|
|
|
|
Expressions:
|
|
|
|
- can we get rid of pieces of asmgen.AssignmentAsmGen by just reusing the AugmentableAssignment ? generated code should not suffer
|
|
- rewrite expression tree evaluation such that it doesn't use an eval stack but flatten the tree into linear code
|
|
that, for instance, uses a fixed number of predetermined value 'variables'?
|
|
The VM IL solves this already (by using unlimited registers) but that still lacks a translation to 6502.
|
|
- this removes the need for the BinExprSplitter? (which is problematic and very limited now)
|
|
and perhaps the assignment splitting in BeforeAsmAstChanger too
|
|
|
|
Optimizations:
|
|
|
|
- VariableAllocator: can we think of a smarter strategy for allocating variables into zeropage, rather than first-come-first-served?
|
|
- when a loopvariable of a forloop isn't referenced in the body, and the iterations are known, replace the loop by a repeatloop
|
|
but we have no efficient way right now to see if the body references a variable.
|
|
- optimize function argument expressions better (use temporary variables to replace non-simple expressions?)
|
|
- various optimizers skip stuff if compTarget.name==VMTarget.NAME. Once 6502-codegen is done from IR code,
|
|
those checks should probably be removed, or be made permanent
|
|
|
|
|
|
STRUCTS again?
|
|
--------------
|
|
|
|
What if we were to re-introduce Structs in prog8? Some thoughts:
|
|
|
|
- can contain only numeric types (byte,word,float) - no nested structs, no reference types (strings, arrays) inside structs
|
|
- 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.
|
|
- no arrays of struct -- because too slow on 6502 to access those, rather use struct of arrays instead.
|
|
can we make this a compiler/codegen only issue? i.e. syntax is just as if it was an array of structs?
|
|
or make it explicit in the syntax so that it is clear what the memory layout of it is.
|
|
- ability to assign struct variable to another? this is slow but can be quite handy sometimes.
|
|
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)
|
|
- ability to be passed as argument to a function (by reference)?
|
|
however there is no typed pointer in prog8 at the moment so this can't be implemented in a meaningful way yet,
|
|
because there is no way to reference it as the struct type again. (current ast gets the by-reference parameter
|
|
type replaced by uword)
|
|
So-- maybe don't replace the parameter type in the ast? Should fix that for str and array types as well then
|
|
|