mirror of
https://github.com/catseye/SixtyPical.git
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92 lines
3.4 KiB
Markdown
92 lines
3.4 KiB
Markdown
History of SixtyPical
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=====================
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0.10
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----
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* Can `call` and `goto` routines that are defined further down in the source code.
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* The `forward` modifier can also be used to indicate that the symbol being copied
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in a `copy` to a vector is a routine that is defined further down in the source.
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* Initialized `word` memory locations.
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* Can `copy` a literal word to a word table.
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* Subtract word (constant or memory location) from word memory location.
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* `trash` instruction explicitly indicates a value is no longer considered meaningful.
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* `copy []+y, a` can indirectly read a byte value into the `a` register.
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* Fixed bug which was preventing `if` branches to diverge in what they initialized,
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if it was already initialized when going into the `if`.
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* Fixed a bug which was making it crash when trying to analyze `repeat forever` loops.
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0.9
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---
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* Add word (constant or memory location) to word memory location.
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* Add word to pointer (unchecked for now).
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* Added `word table` type.
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* Can `copy` from word storage location to word table and back.
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* A `vector` can name itself in its `inputs` and `outputs` or `trashes` sets.
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* Implementation: `--debug` shows some extra info during analysis.
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* Fixed bug where `copy`ing literal word into word storage used wrong endianness.
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* Fixed bug where every memory location was allocated 2 bytes of storage, regardless of type.
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* Tests: use https://github.com/tcarmelveilleux/dcc6502 to disassemble code for comparison.
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0.8
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---
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* Explicit word literals prefixed with `word` token.
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* Can `copy` literals into user-defined destinations.
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* Fixed bug where loop variable wasn't being checked at end of `repeat` loop.
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* `buffer` and `pointer` types.
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* `copy ^` syntax to load the addr of a buffer into a pointer.
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* `copy []+y` syntax to read and write values to and from memory through a pointer.
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0.7
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---
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* User-defined `byte` locations can be given an initial value.
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* `word` type locations which can be defined and `copy`ed between.
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* Can `copy` directly from one user-defined `byte` location to another.
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0.6
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---
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* Added `routine` and `vector` types, and `copy` instruction.
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* Both routines and vectors can declare `inputs`, `outputs`, and `trashes`,
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and these must be compatible to assign a routine or vector to a vector.
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* Added `goto` (tail call) instruction, jumps to routine or through vector.
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* `call` can call a subroutine indirectly, via a vector.
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* Routine name is now shown in analysis error messages.
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0.5
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---
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* Added `byte table` type locations and indexed addressing (`+ x`, `+ y`).
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* Integer literals may be given in hexadecimal.
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* Line comments may be included in source code by prefixing them with `//`.
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0.4
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---
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* Added `repeat` loops to the language, which can repeat until a flag
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is set (or `not` set), or which can repeat `forever`.
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* `if not` inverts the sense of the test.
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* Added explicitly-addressed memory locations.
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0.3
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---
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* Added external routine declarations.
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* Added ability to compile to 6502 machine code and output a `PRG` file.
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0.2
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---
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A complete reboot of SixtyPical 0.1. The reference implementation was
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rewritten in Python. The language was much simplified. The aim was to get the
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analysis completely right before adding more sophisticated and useful features
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in future versions.
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0.1
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---
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Initial inspired-but-messy version implemented in Haskell.
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