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SixtyPical
==========
_Version 0.21. Work-in-progress, everything is subject to change._
_Version 0.21_
| _See also:_ [Bubble Escape 2K](https://github.com/catseye/Bubble-Escape)
∘ [SITU-SOL](https://github.com/catseye/SITU-SOL)
**SixtyPical** brings [extended static checking][] to the [6502][].
- - - -
_NOTE:_ Having met the majority of its goals, the SixtyPical project
might not see much more development going forward. See
[Future directions for SixtyPical][] for more information.
- - - -
**SixtyPical** brings advanced static analysis to the [6502][].
SixtyPical is a [low-level](#low-level) programming language
supporting some advanced [static analysis](#static-analysis) methods.
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### Static analysis
The SixtyPical language defines an [effect system][], and the reference
compiler [abstractly interprets][] the input program to check that
it conforms to it. It can detect common mistakes such as
compiler [symbolically executes][] the input program in the manner of
[flow typing][] to confirm that it does not violate it. This can detect
common mistakes such as
* you forgot to clear carry before adding something to the accumulator
* a subroutine that you called trashes a register you thought it preserved
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* [Output formats supported by `sixtypical`](doc/Output%20Formats.md)
* [TODO](TODO.md)
[Future directions for SixtyPical]: https://gist.github.com/cpressey/f35e104b3e3cf555824aa2b4d15ea858
[6502]: https://en.wikipedia.org/wiki/MOS_Technology_6502
[MOS Technology 6502]: https://en.wikipedia.org/wiki/MOS_Technology_6502
[extended static checking]: https://en.wikipedia.org/wiki/Extended_static_checking
[effect system]: https://en.wikipedia.org/wiki/Effect_system
[abstractly interprets]: https://en.wikipedia.org/wiki/Abstract_interpretation
[symbolically executes]: https://en.wikipedia.org/wiki/Symbolic_execution
[flow typing]: https://en.wikipedia.org/wiki/Flow-sensitive_typing
[calling conventions]: https://en.wikipedia.org/wiki/Calling_convention
[register allocation]: https://en.wikipedia.org/wiki/Register_allocation
[VICE]: http://vice-emu.sourceforge.net/