| Commit message (Collapse) | Author | Age | Files | Lines |
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Until we get scrolling on functions, it's a little cleaner to draw the
primitives on top.
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Since we switched error trace semantics from a designated label to a designated
depth (commit 9831a8cef9 on May 19).
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This will help us with some common debug scenarios.
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Another commit, another bugfix.
Some snippets from my currently exploding todo list:
- always investigate lookup errors immediately. Beyond the root cause, they should never happen at the moment, while we aren't reclaiming memory.
we should always return a more precise error message. Usually involving null pointer checks.
- on abort, print out stack trace
- emit mapping of labels to addresses during survey
- store a mapping of symbols somewhere in the code image
- stop allocating 1KB per token; expand space for tokens as needed
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I don't understand why a second line in the keyboard is visible now where
it wasn't before. That whole aspect has unclear desires. What exactly do
I want to happen on newlines?
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Clean up trace colors.
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sed -i 's,0x12/bg=almost-black,0xdc/bg=green-bg,g' shell/*.mu
sed -i 's, 0/bg, 0xc5/bg=blue-bg,g' shell/*.mu
sed -i 's, 7/fg=trace, 0x38/fg=trace,g' shell/*.mu
sed -i 's, 7/bg=grey, 0x5c/bg=black,g' shell/*.mu
Still a few issues.
Thanks Adrian Cochrane and Zach DeCook.
https://floss.social/@alcinnz/106152068473019933
https://social.librem.one/@zachdecook/106159988837603417
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I keep running into one hole in Mu's memory-safety since dropping the Linux
dependency: null pointers no longer error when dereferenced. Here the problem
manifests as aliasing: lots of gap buffers share the same exact data near
address 0, because it was never initialized.
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Once I came up with the right approach, this worked on the first try once
I got the types and registers to line up!
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Show all builtins now that we have more space.
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Get rid of my experiment adding Game of Life to the shell.
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It took me _way_ too long to realize that I'm not checking for errors within
the loop, and that will cause it to manifest as an infinite loop as inner
evaluations fail to run.
Debugging notes, for posterity:
printing one row of a chessboard pattern over fake screen (chessboard screen 4 0 0 15) gets stuck in an infinite loop halfway through
debug pattern during infinite loop: VWEX. It's still in the loop but it's not executing the body
raw (fill_rect screen 16 0 20 4 15) works fine
same number of calls to fill_rect work fine
replacing calls to fill_rect with pixel inside chessboard2 works fine
at the point of the infinite loop it's repeatedly going through the hline loop
-- BUT it never executes the check of the loop (< lo hi) with lo=20, hi=20. Something is returning 1, but it's not inside <
stream optimization is not implicated
simple test case with a single loop
(
(globals . (
(foo . (fn () (screen i n)
(while (< i n)
(pixel screen 4 4 i)
(pixel screen 5 4 i)
(pixel screen 6 4 i)
(pixel screen 7 4 i)
(set i (+ i 1)))))
))
(sandbox . (foo screen 0 100))
)
simpler (if you reset cursor position before every print):
(
(globals . (
(foo . (fn () (screen i n)
(while (< i n)
(print screen i)
(set i (+ i 1)))))
))
(sandbox . (foo screen 0 210))
)
I now believe it has nothing to do with the check. The check always works.
Sometimes no body is evaluated. And so the set has no effect.
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'def' creates new bindings (only in globals)
'set' only modifies existing bindings (either in env or globals)
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Mu computer now has more code in it:
(
(globals . (
(hline1 . (fn () (screen y lo hi) (if (>= lo hi) () ((fn () (pixel screen lo y 12) (hline1 screen y (+ lo 1) hi))))))
(vline1 . (fn () (screen x lo hi) (if (>= lo hi) () ((fn () (pixel screen x lo 12) (vline1 screen x (+ lo 1) hi))))))
(hline . (fn () (screen y) (hline1 screen y 0 (width screen))))
(vline . (fn () (screen y) (vline1 screen y 0 (height screen))))
(andf . (fn (a b)
(if a
(if b
1
())
())))
(brline . (fn (screen x0 y0 x1 y1)
((fn (dx dy sx sy)
((fn (err)
(brline1 screen x0 y0 x1 y1 dx dy sx sy err))
(+ dx dy)))
(abs (- x1 x0))
(- 0 (abs (- y1 y0)))
(sgn (- x1 x0))
(sgn (- y1 y0)))))
(brline1 . (fn (screen x y xmax ymax dx dy sx sy err)
(pixel screen x y 12)
(if (andf (= x xmax) (= y ymax))
()
((fn (e2)
(brline1 screen
(if (>= e2 dy)
(+ x sx)
x)
(if (<= e2 dx)
(+ y sy)
y)
xmax
ymax
dx
dy
sx
sy
(+ err
(+
(if (>= e2 dy)
dy
0)
(if (<= e2 dx)
dx
0)))))
(* err 2)))))
))
(sandbox . (brline screen 1 1 5 5))
)
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Right now we just render the state of the screen at the end of an evaluation.
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