Commit Graph

11 Commits

Author SHA1 Message Date
Bobbi Webber-Manners
6b6c7e7a70
v0.71: disassembler on 6502, VIC20 workaround
- Added `disass` to VIC20, C64, Apple II builds.
- Workaround for broken getln() call on VIC20.
2018-05-21 23:01:23 -04:00
Bobbi Webber-Manners
6dbf45c39c
v0.70: disassembler, immediate mode VM ops
- VM now prompts for filename to load bytecode from
- Added new EightBall disassembler (`disass`), removed disassembly printout from compiler
- Fixes to interpreter / compiler error reporting.  Should no longer report completely incorrect line numbers!
- Added new immediate mode VM instructions for load (`LDAWI`, `LDABI`, `LDRWI`, `LDRBI`), store (`STAWI`, `STABI`, `STRWI`, `STRBI`), and flow control (`JSRI`, `JMPI`, `BRCI`).  Modified compiler to use these new instructions.  This significantly improves code density and VM execution speed.
2018-05-21 13:58:41 -04:00
Bobbi Webber-Manners
42bbb90acf
v0.69: Small bug-fixes and improvements
- Compiler: do not emit LDI 0, DISC sequence, which is a no-op.
- VM: add GPL info and progress when loading bytecode
- Most importantly: a version of Tetris coded in EightBall!
2018-05-18 21:11:53 -04:00
Bobbi Webber-Manners
ea3a6a83e2
v0.68: compiler bug fixes, improved efficiency
- Fixed indentation of VM code. Turned on stack checks for GCC only.
- Added new `VM_DISCARD` VM instruction (and compiler support).  This makes the VM significantly more efficient.
- Configured Linux VM to be compatible with Apple II environment.
- Added line to force to interpret mode to prevent surprises.
- Compiler: fixed bug when exiting `for` loop using `return`.  The compiler was leaking a word on the evalutation stack after jumping out of the body of the `for` loop.
2018-05-13 13:59:40 -04:00
Bobbi Webber-Manners
18942a9ba0
v0.67: Source code cleanup, optimizations
- Managed to free up several hundred bytes
2018-05-11 19:43:27 -04:00
Bobbi Webber-Manners
d9532c8f71
v0.62: Fixed function call bug in compiled code
- The compiler was not pushing the SENTINEL value to the operator stack and popping it afterwards, so the expression parsing was getting messed up.  Now fixed.
- Also added targets to the Makefile to allow the emulators to be run directly (make xvic, make x64, make mame).
2018-05-04 00:02:16 -04:00
Bobbi Webber-Manners
92164c3274
v0.60: Array pass by reference works in compiler
- Evaluating 'naked' array name `A` gives pointer to payload (same as `&A` or even `&A[0]`)
- Improved loading message in VM
- Got array pass-by-reference to work in compiler
- Fixed eval stack leak in array initialization code generated by compiler
2018-05-03 19:53:40 -04:00
Bobbi Webber-Manners
ed032c11ea
v0.58: Allow constant exprs for array dimensions 2018-05-03 01:12:21 -04:00
Bobbi Webber-Manners
7a91e0c0fb
v0.57: Added mode statement for Apple II 2018-05-02 20:27:27 -04:00
Bobbi Webber-Manners
c026602f62
v0.56: Various minor improvements
- Improved Makefile to make it easier to configure paths to tools
- Made number of signicant characters for subroutine and variable names a `#define` constant and tested it works with different values
- Modified memory allocation in `HEAP2` - the source code is now allocated at the bottom, growing up.  The compiler's linkage table is allocated at the top growing down.  This makes it easy to dispose of the linkage table after compilation is done.
- This revealed that my memory limits were wrong so code was crashing on C64, Apple II.  I bumped up the bottom of `HEAP2` by 0x500 or so.  Not sure why this is needed.
- Added a signon banner to the virtual machine so it is clear it is loading bytecode.  Screen is cleared after loading is complete, so user knows when execution begins.
2018-05-02 17:41:42 -04:00
Bobbi Webber-Manners
11f99c9840
EightBall v0.5 - With Compile and Virtual Machine 2018-04-27 23:47:22 -04:00