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All extant SubX programs generate identical binaries using either the
C++ or the self-hosted SubX translators.
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A little more resizing of buffers. apps/hex.subx is now building an
identical binary.
I'm now aborting on allocation failures. That requires disabling
a couple of tests. (I'm not quite confident enough of this decision to
delete them outright.) I want to treat all segfaults as bugs, and
machine code is no place to add boilerplate checks for return values of
standard library functions.
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Ensure we don't create overly long lines. Now this works:
$ ./diff_ntranslate 0*.subx apps/subx-common.subx
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Clean up. All apps now translating correctly except for the phases of
the self-hosted translator. Next step: SubX-in-SubX in SubX-in-SubX.
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Make the output of the `pack` phase a little easier to read.
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Translates 5k lines of input in 26 seconds.
I'm not sure why I need to grow the label table. It was already 512 entries
long, and I'm only using 373 so far.
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We can now translate layers 49-72 using the self-hosted translator.
The translator has now demonstrated translation over 4k lines. Most verbose
phase output is 325KB, even if the final binary is 15KB.
Emulation is too slow now, so I'm back to debug by print on a Linux machine.
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We can now translate layers 49-56 using the self-hosted translator
(`translate` and `ntranslate`).
As a follow-up to commit 5404, the self-hosted translator is a little
more strict than the C++ translator in 3 places:
a) All .subx files must define a data segment.
b) All .subx files must define an `Entry` label.
c) All numbers must be in *lowercase* hex.
In all cases, where programs work with the C++ translator but violate
the self-hosted translator's assumptions, we must make sure we raise
errors rather than silently emit bad code.
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Break a dependency from `print-int32` to `from-hex-char`.
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Fix CI.
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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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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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Another batch of incorrectly signed conditional jumps. (Follow-up to
commit 5180.)
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Some nooks and crannies will need light final debugging with xxd, but
emit-hex-output covers most of the logic.
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Move test slice variables out of the data segment and close to their
usages. Makes tests a little easier to read even if we spend a few more
instructions each time.
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Everywhere we check if something is true, we check it by comparing
against 0, not 1.
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style tweaks
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reorg in subx-common.subx
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High time we pulled in the final changes to dquotes.
In the process we fix one recently introduced duplicate symbol.
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Get 'assort.subx' working again.
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Kinda hacky, but might scale enough for machine code.
This was really hard to debug. Single tests passed, but when I ran all
tests I got breakage because tests long before (from the 056trace layer)
were not cleaning up properly.
My instinct was to call clear-stream on Trace-stream, which was wrong
(the trace didn't have the wrong contents, it was literally a bad
object). It was also wrong in a counter-productive way: calling
clear-stream on a real Trace stream (which is the size of a page of
memory) takes a long time in emulated mode.
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No trace statements yet, so we don't know if it works.
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Clean up CI.
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Simplify `string-equal`.
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I think the path to readable tests for survey.subx passes through
white-box tests.
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'get-or-insert-stream' is now the more generic 'get-or-insert' that can
handle tables of any value type. But callers have to be careful to cast
values to the right type.
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Mostly for tests. For every new type we want to compare in a test, we're
now going to start using some primitive that can parse its value from string. In this manner we can get syntax for literals in machine code.
Open question: parsing aggregates of aggregates. Like an array of structs.
This is the first time we allocate from the heap in standard library tests.
So we now need to start initializing the heap in all our apps.
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hoist 'Heap' variable into the std library in anticipation of the parse-array-of-ints
primitive.
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Fix CI.
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Right now SubX defines headers with the following syntax:
```
=== ...
```
The `...` can be either a numeric address or a name. Numeric addresses
are useful for tests where we want to check addresses of individual instructions.
Names are useful in real programs where we want to add to a segment in
many places.
This approach has long seemed a mess. It's hard to explain, and there's
a certain amount of historical evolution that led to it that should be
irrelevant to comprehend the current state of the codebase. I started out
assuming the first segment was always code, before adding the special names
'code' and 'data'. We pretend to support more than two segments but we
don't really.
To simplify the code and explanation we'll move to a new syntax:
```
=== <name> <address>
```
Code will always belong in the special name 'code', but it no longer has
to be first.
We need to migrate both our SubX-in-SubX phases and the C++ version. The
plan is to start from the top down and update bootstrapping phases that've
already been built (see commit 5102 for the list of phases). This commit
updates pack.subx. Current state:
✓ hex.subx (no changes required)
survey.subx
✓ pack.subx (fixed here)
assort.subx
dquotes.subx
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