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Currently failing at layer 54:
```
$ time ./translate 049memory_layout.subx 05[0-4]*.subx; ./subx run a.elf test
leaky-get-or-insert-slice: too many segments
```
Emulation is also damn slow. But running in native mode is fast.
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We now have a new pass called 'tests' which code-generates a new
function called 'run-tests', just like the C++ layer `tests.cc`.
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Fix CI.
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Various buffer sizes needed to be grown for ex11. But the next
bottleneck is that we need to code-generate run-tests.
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Bugfix fourteen: we need different address computation logic for code vs
data labels.
It's really about different categories of instructions having different
address computation logic. This subtle distinction will make good error
messages hard. But that's a problem for later.
Now there's just one example program not translating.
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When running a single test, stop always opening the trace. Instead create
a separate affordance for that, and also have it reuse windows.
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Clean up.
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Figured out what's going in with bug fourteen: displacement operands
aren't always used relative to the PC. Does this mean I need to track
instruction boundaries past pack? :'(
No, I just need different logic for labels in code vs data segments.
This was an interesting bug for reminding me of the difference between
the emulator-level trace and the application-level trace. The former has
1.5 million lines, while the latter has a dozen. Luckily, just dumping
the latter immediately made obvious what the issue was.
Though this experience does suggest some further ideas for debugging
tools:
slice trace by line and phase
slice trace by start and end label
debug UI for SubX translator
2D layout: rows = lines of code; columns = translator phases
each 'cell' in this layout contains a list of log lines
shows what came in, what was emitted
easily collapse any cell
These are domain-specific tools. Special-cased to the SubX translator
phases.
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Bugfix thirteen: displacement calculations were wrong because current
offset was not being updated properly as words were being read and
emitted.
Now 10/12 example programs are translated correctly.
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Bugfix twelve: ModR/M was being incorrectly computed.
This is one of two problems with subx/examples/ex3, so no new passing
examples.
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Fix CI.
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Fix CI.
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Clean up other examples as well to satisfy the requirements in commit
5404.
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Bugfix eleven: segment flags were incorrectly computed. examples/ex1 now
verified! Added to CI.
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Bugfix ten: type error in `convert`. I was calling `rewind-stream` on a
`buffered-file`.
examples/ex1 is now just one nibble off the canonical.
I *have* found one missing feature in the self-hosted translator,
though: dquotes doesn't support newlines in strings, even though the C++
version does. dquotes parses them right, but the value initialized in
the data segment is wrong.
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Bugfix nine: flush(out) after translation is done.
Still one remaining bug from comparing ELF binaries: emit-segments
prints nothing for some reason.
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Bugfix eight: incorrect segment count in ELF header.
The generated examples/ex1 is still not right. But it has the second
segment now. Or almost all of it. Final byte is missing for some reason.
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The result isn't an identical binary to before, and it segfaults when
run. But it's bugfix seven.
A couple of places where we make .subx files a little more strict:
a) All .subx files must define a data segment. Even if they have no
data.
b) All .subx files must define an `Entry` label for the binary to start
at. Earlier we used to default to the start of the code label. That's
not too hard to add; we'd just need to:
i) rename `get` to `get-or-abort`
ii) clone a third variant of `get-or-insert` called `get` that returns
null if the key is not found.
iii) use `get` rather than `get-or-abort` when looking up the `Entry`
label.
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Clean up.
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All assertions in `test-convert-computes-addresses` still failing.
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map of how far we've gotten by now (functions with '*' independently tested):
✓ compute-offsets*
✓ compute-addresses*
✓ emit-output
✓ emit-headers
✓ emit-elf-header
✓ emit-hex-array*
✓ first emit-elf-program-header-entry
✓ emit-hex-array*
? second emit-elf-program-header-entry
emit-hex-array*
emit-segments*
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Clean up.
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Clean up.
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I carefully logged the segment a label is declared in but forgot to
actually save it in the table. This has been a theoretic concern for
some time, but I've never seen it actually happen until now. SubX is
just too low level.
Now I get past the first two phases but code generation fails to find
the 'Entry' label.
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Snapshot at a random moment, showing a new debugging trick: hacking on
the C++ level to dump memory contents on specific labels.
For some reason label 'x' doesn't have a segment assigned by the time we
get to compute-addresses.
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