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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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Clean up some old TODOs related to our pre-mmap limitations.
Also caught another case of using the wrong comparison. When comparing
addresses, one must always use unsigned rather than signed jump instructions.
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Still some failing tests:
- emit-string-literal-data doesn't ignore metadata when computing the
length of literal strings
- emit-string-literal-data doesn't handle escape sequences
One issue doesn't have a failing test:
- emit-metadata doesn't handle string literals containing '/'
All these open issues involve a common design question: how to parse a
'word' that includes a string literal that may include spaces.
For everything else I know words can't contain spaces and datums can't
contain slashes. But for string literals things are tougher.
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dquotes.subx is now segfaulting after this merge. Seems to be trying to
use addresses from the old stack.
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Skimping on tests; the code changes seem pretty trivial. Will this fix
CI?!
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Pretty blunt for now; just abort the entire program on any failure to write.
I'm encountering it because I'm somehow treating a stream address as a
file descriptor. Maybe mmap is returning addresses below 0x08000000?
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Bugfix: I'd neglected to update the input stream's state when natively
writing a stream to file.
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Segfault in this branch is now fixed.
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All tests passing now. Things are very explicit; before a program can `allocate`
memory, it has to first obtain a segment from the OS using `new-segment`.
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These are variants of write-byte-buffered and print-byte-buffered respectively
that operate on in-memory `stream`s rather than `buffered-file`s.
They don't operate on files, so we'll avoid using the prefix 'write-'.
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Operations on buffered-file now always include the word 'buffered'. More
verbose, but hopefully this highlights holes in the library.
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Pull in a _different_ function than `next-word` (commit 5092) into a shared
file between phases. Let's see how this goes.
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