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This is going better than expected; just 3 failing tests among the new
ones.
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Font rendering now happens off the real screen, which provides the effect
of double-buffering.
Apps can now also use convert-graphemes-to-pixels for more traditional
double-buffering.
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I wrote a comment about how some code was not covered by tests, and then
promptly forgot what it was for. This is why we need tests.
Now the hack is gone.
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Minor counter infrastructure. We invoke next-token 1400 times while loading
the shell's data disk, so we're wasting around 1.4MB during tokenization.
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It is used to print to the trace, and we shouldn't crash the whole computer
just because the trace ran out of space.
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Move abort to SubX. We'll need to do some unsafe stuff to display the call
stack here.
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'def' creates new bindings (only in globals)
'set' only modifies existing bindings (either in env or globals)
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Tested by inserting a call into the shell, but we can't leave it in because
every test ends up clobbering the disk. So it's now time to think about
a testable interface for the disk.
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See shell/README.md for (extremely klunky) instructions.
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Top-level and linux/ now have separate vocabulary.md files.
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Baremetal is now the default build target and therefore has its sources
at the top-level. Baremetal programs build using the phase-2 Mu toolchain
that requires a Linux kernel. This phase-2 codebase which used to be at
the top-level is now under the linux/ directory. Finally, the phase-2 toolchain,
while self-hosting, has a way to bootstrap from a C implementation, which
is now stored in linux/bootstrap. The bootstrap C implementation uses some
literate programming tools that are now in linux/bootstrap/tools.
So the whole thing has gotten inverted. Each directory should build one
artifact and include the main sources (along with standard library). Tools
used for building it are relegated to sub-directories, even though those
tools are often useful in their own right, and have had lots of interesting
programs written using them.
A couple of things have gotten dropped in this process:
- I had old ways to run on just a Linux kernel, or with a Soso kernel.
No more.
- I had some old tooling for running a single test at the cursor. I haven't
used that lately. Maybe I'll bring it back one day.
The reorg isn't done yet. Still to do:
- redo documentation everywhere. All the README files, all other markdown,
particularly vocabulary.md.
- clean up how-to-run comments at the start of programs everywhere
- rethink what to do with the html/ directory. Do we even want to keep
supporting it?
In spite of these shortcomings, all the scripts at the top-level, linux/
and linux/bootstrap are working. The names of the scripts also feel reasonable.
This is a good milestone to take stock at.
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I've found two bugs in SubX libraries:
1. next-word had an out-of-bounds read
2. next-word was skipping comments, because that's what I need during bootstrapping.
I've created a new variant called next-raw-word that doesn't skip comments.
These really need better names.
We're now at the point where 4b.mu has the right structure and returns
identical result to 4a.mu.
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I've wrestled for a long time with how to support integer division with
its hard-coded registers. The answer's always been staring me in the face:
just turn it into a function! We already expect function outputs to go
to hard-coded registers.
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Both manual tests described in commit 7222 now work.
To make them work I had to figure out how to copy a file. It
requires a dependency on a new syscall: lseek.
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This found several bugs due to me not checking for null strings.
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Snapshot: tile currently segfaulting. I need to back up and make it easier
to debug.
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Another suggestion from the Future of Software forum.
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So far I've been assuming that read-key only works for ascii, and that
I'd need to get more sophisticated both for multi-byte utf-8 and multi-byte
terminal escape codes like arrow keys. Rather to my surprise, both work
fine. We just need to adjust the types to reflect this fact.
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Roll back all buffering of Stdout.
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tile is already visibly slow (49x212 screen) :/ So programmer needs more
control over performance.
But this may not be the right approach. That extra flush-stdout in tui.mu
suggests it's either going to be finicky, or we have to flush on every
attribute change. And going through a buffered-file may be slower. May.
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This was surprisingly hard; bugs discovered all over the place.
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Print answers in decimal in apps/arith.mu
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We still need a few primitives, but we can implement these as needed. I'm
ready to call the fake screen done.
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No support for combining characters. Graphemes are currently just utf-8
encodings of a single Unicode code-point. No support for code-points that
require more than 32 bits in utf-8.
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