a7dcb522c2
The 1 byte limitation has been effective for a while now, but I hadn't made the move yet, I wanted to see if the limitation would cause me problems. It doesn't. Doing this now slightly facilitates the IY->BC move in z80. Bootstrapping: if you try to recreate the CVM binary from the previous commit with this code, you'll have bootstrapping problems. The first bootstrap will compile a binary with 2-bytes wide cells but branching conditionals that yields 1-byte cells. That's bad. I got around the issue by temporarily inserting a "397 399 LOADR" instruction in cvm/xcomp.fs, right before the xcomp overrides. This way, I force 1-byte cells everywhere on the first compiliation, which then allows me to apply the logic change in cvm/vm.c and have a properly running binary. |
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|---|---|---|
| .. | ||
| .gitignore | ||
| Makefile | ||
| README.md | ||
| avra.sh | ||
| forth.bin | ||
| forth.c | ||
| stage.c | ||
| vm.c | ||
| vm.h | ||
| xcomp.fs | ||
| zasm.sh | ||
README.md
C VM
This is a C implementation of Collapse OS' native words. It allows Collapse OS to run natively on any POSIX environment.
Requirements
You need ncurses to build the forth executable. In debian-based distros,
it's libncurses5-dev.
Build
Running make will yield forth and stage executables.
Usage
To play around Collapse OS, you'll want to run ./forth. Type 0 LIST for
help.
The program is a curses interface with a limited, fixed size so that it can provide a AT-XY interface.
You can get a REPL by launching the program with rlwrap(1) like
this:
rlwrap -e '' -m -S '> ' ./forth /dev/stdin
Problems?
If the forth executable works badly (hangs, spew garbage, etc.),
it's probably because you've broken your bootstrap binary. It's easy to
mistakenly break. To verify if you've done that, look at your git status. If
forth.bin is modified, try resetting it and then run make clean all. Things
should go better afterwards.
A modified blkfs can also break things (although even with a completely broken
blkfs, you should still get to prompt), you might want to run make pack to
ensure that the blkfs file is in sync with the contents of the blk/ folder.
If that doesn't work, there's also the nuclear option of git reset --hard
and git clean -fxd.
If that still doesn't work, it might be because the current commit you're on is broken, but that is rather rare: the repo on Github is plugged on Travis and it checks that everything is smooth.