| Commit message (Collapse) | Author | Age | Files | Lines |
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Without this there's no way to convert an int to a byte. And that feels
too restrictive, and gives up a lot of safe things one might want to do
with bytes. (Such as divide a number by 10 and emit the remainder as a
byte.)
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I've wrestled for a long time with how to support integer division with
its hard-coded registers. The answer's always been staring me in the face:
just turn it into a function! We already expect function outputs to go
to hard-coded registers.
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Regression: I'd broken compare on bytes. Apparently I took away support
for bytes from numberlike-output even though I didn't need to by the end.
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This seems to preserve the intent of commit 6555.
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I don't need to pass the function pointer quite so low. I think..
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First step: start passing the function name into code-generation functions.
We're going to need it for the error message.
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I had to tweak one app that wasn't following the rules.
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Minor tweaks to get Mu shell running nicely on a Linux console atop Qemu.
We also need to switch a few 256-color codes to 8-color mode. I'm not
sure whether/how to patch the repo for those.
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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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Ok, I found a failing manual test for files as well.
Here are the two steelman tests, one for screens and one for files:
1.
5 5 fake-screen =s
s 1 down 1 right
ctrl-d foo
expand
final state:
s foo foo
s 1 down 1 right ⇗
┌─────┐ ┌─────┐
┌─────┐ 1 ┌─────┐ 1 ┌─────┐ │
┌─────┐ │ ┌─────┐ │ ─
│ │
│ │
─
└─────┘ └─────┘
└─────┘ └─────┘ └─────┘
└─────┘ └─────┘
2.
"x" open =f
f read f read
ctrl-d read2
expand
final state:
f read2 read2
f read f read ⇗
FILE ❝def❞
FILE ❝abc❞ FILE ❝❞
❝def❞ ❝ghi❞
In both cases there are 3 levels of issues:
- getting a single-line expression to work
- getting a single-line expression to work when operating on a binding
defined in a previous line
- getting an expanded function call to work
The third is where the rub is right now. And what both examples above share
is that the function performs 2 mutations to the screen/file.
So we need a deep copy after all. And it's not very clear how to copy a
file descriptor including the seek location. Linux's dup() syscall creates
an alias to the file descriptor. And opening /proc seems awfully Linux-specific:
https://stackoverflow.com/questions/54727231/duplicating-file-descriptor-and-seeking-through-both-of-them-independently/54727424#54727424
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I can't get file values to exhibit the same problem. Why are fake screens
special?
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Even this isn't enough. While shallow copies keep us from transferring
new bindings to callers, the screen object is still the same, so mutations
to bindings are contagious.
Basically I'm losing IQ points from programming in a language that encourages
mutation over copying.
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