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64 lines
2.4 KiB
Markdown
64 lines
2.4 KiB
Markdown
SixtyPical
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==========
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SixtyPical is a very low-level programming language, similar to 6502 assembly,
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with static analysis through abstract interpretation.
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In practice, this means it catches things like
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* you forgot to clear carry before adding something to the accumulator
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* a subroutine that you call trashes a register you thought was preserved
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* you tried to write the address of something that was not a routine, to
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a jump vector
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and suchlike. It also provides some convenient operations and abstractions
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based on common machine-language programming idioms, such as
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* copying values from one register to another (via a third register when
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there are no underlying instructions that directly support it)
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* explicit tail calls
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* indirect subroutine calls
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The reference implementation can execute, analyze, and compile SixtyPical
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programs to 6502 machine code.
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It is a **work in progress**, currently at the **proof-of-concept** stage.
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The current development version of SixtyPical is 0.8-PRE.
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Documentation
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-------------
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* Design Goals — coming soon.
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* [SixtyPical specification](doc/SixtyPical.md)
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* [SixtyPical history](HISTORY.md)
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* [Literate test suite for SixtyPical syntax](tests/SixtyPical%20Syntax.md)
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* [Literate test suite for SixtyPical execution](tests/SixtyPical%20Execution.md)
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* [Literate test suite for SixtyPical analysis](tests/SixtyPical%20Analysis.md)
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* [Literate test suite for SixtyPical compilation](tests/SixtyPical%20Compilation.md)
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* [6502 Opcodes used/not used in SixtyPical](doc/6502%20Opcodes.md)
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TODO
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----
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* `word table` type.
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* `vector table` type.
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* zero-page memory locations.
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* indirect addressing.
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* `low` and `high` address operators (turn `word` type into `byte`.) Possibly.
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* save registers on stack or in memory (this preserves them = not trashed)
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At some point...
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* initialized `byte table` memory locations
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* always analyze before executing or compiling, unless told not to
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* `trash` instruction.
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* `interrupt` routines.
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* 6502-mnemonic aliases (`sec`, `clc`)
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* other handy aliases (`eq` for `z`, etc.)
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* have `copy` instruction able to copy a constant to a user-def mem loc, etc.
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* add absolute addressing in shl/shr, absolute-indexed for add, sub, etc.
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* check and disallow recursion.
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* automatic tail-call optimization (could be tricky, w/constraints?)
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* re-order routines and optimize tail-calls to fallthroughs
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