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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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We might not scan directly through the gap buffer after all. Premature
optimization?
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It might be too ambitious for an initial Mu system, and I also want to
watch my novelty budget. I also have great doubts about the ability of
this live-updating postfix system to scale to interesting programs. Conditionals,
loops, multi-line functions, all this requires further work.
Instead, I'm going to recenter around Mu's original goals:
- saying no to most features
- encouraging/teaching testing
- traces as a unifying metaphor
In particular, instead of a live-updating system, the new debug loop will
be:
- generate a trace
- browse the trace
- modify the program
- generate a trace
- ...
The only persistence we'll need here is a way to track what the programmer
has drilled into in the trace. That might have some commonalities with
the old system of expanded words.
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This is quite new and speculative. I tried to list out some potential future
tests later when we add 'return'. We'll see how it goes.
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Now there's a neat resonance carrying over all 3 levels of Mu notation.
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In the process I found a bug in the Mu compiler. Limitations of just asserting
the emitted code but not running it.
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