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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 had to tweak one app that wasn't following the rules.
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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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We don't yet support emulating these instructions in `bootstrap`. But generated
binaries containing them run natively just fine.
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An extra test that should have been in commit 6781.
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This was surprisingly hard; bugs discovered all over the place.
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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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As a side-effect I find that my Linode can print ~100k chars/s. At 50 rows
and 200 columns per screen, it's 10 frames/s.
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https://archive.org/details/akkartik-2min-2020-07-01
In the process I found a bug, added a new syscall, and 'emulated' it.
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Several bugs fixed in the process, and expectation of further bugs is growing.
I'd somehow started assuming I don't need to have separate cases for rm32
as a register vs mem. That's not right. We might need more reg-reg Primitives.
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CI should start passing again now.
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Cleaner abstraction, but adds 3 instructions to our overhead for handles,
including one potentially-hard-to-predict jump :/
I wish I could have put the alloc id in eax for the comparison as well,
to save a few bytes of instruction space. But that messes up the non-null
case.
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Mystery solved of why the syntax sugar phases don't work even though they
don't use any functions whose signatures changed in the migration to handles.
The answer: they use the Registers table, and it needs to use handles rather
than raw strings.
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Mystery solved of why the syntax sugar phases don't work even though they
don't use any functions whose signatures changed in the migration to handles.
The answer: they use the Registers table, and it currently doesn't use
handles.
Rather than create a whole new set of functions that operate on addresses,
I'm going to create fake handles that are never intended to be reclaimed.
Which raises the question of the best way to do that. I'd like to continue
using string syntax, so I'm going to use a prefix in the payload that can
also be rendered as a string. But all the printable characters start with
0x20, and we don't currently have escape sequences for null or any other
non-printable characters.
I _could_ use newlines, but that seems overly clever. So instead I'll once
again not worry about some hypothetical problem with running out of alloc-ids,
and just carve out half of the id space that can't be used for real alloc
ids. Ascii doesn't use the most significant bit of bytes, so it seems like
a natural separation.
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For this one commit we need to bootstrap ourselves with subx_translate_debug.
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So far it's unclear how to do this in a series of small commits. Still
nibbling around the edges. In this commit we standardize some terminology:
The length of an array or stream is denominated in the high-level elements.
The _size_ is denominated in bytes.
The thing we encode into the type is always the size, not the length.
There's still an open question of what to do about the Mu `length` operator.
I'd like to modify it to provide the length. Currently it provides the
size. If I can't fix that I'll rename it.
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At the SubX level we have to put up with null-terminated kernel strings
for commandline args. But so far we haven't done much with them. Rather
than try to support them we'll just convert them transparently to standard
length-prefixed strings.
In the process I realized that it's not quite right to treat the combination
of argc and argv as an array of kernel strings. Argc counts the number
of elements, whereas the length of an array is usually denominated in bytes.
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Support parsing ints from strings rather than slices.
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Fix CI.
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Anytime we create a slice, the first check tends to be whether it's empty.
If we handle ill-formed slices here where start > end, that provides a
measure of safety.
In the Mu translator (mu.subx) we often check for a trailing ':' or ','
and decrement slice->end to ignore it. But that could conceivably yield
ill-formed slices if the slice started out empty. Now we make sure we never
operate on such ill-formed slices.
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Layers 0-89 are used in self-hosting SubX.
Layers 90-99 are not needed for self-hosting SubX, and therefore could
use transitional levels of syntax sugar.
Layers 100 and up use all SubX syntax sugar.
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Try to make the comments consistent with the type system we'll eventually
have.
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Fix a bug in one test: it checks eax when the component under test returns
nothing. It's been just accidentally passing all these months.
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Support binary operations with reg/mem and reg operands.
Everything is passing. However, the self-hosting translator now generates
some discrepancies compared to the C++ translator :(
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Replace calculations of constants with labels.
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