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Variable 'instruction_counter' was obfuscating more than it clarified.
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Since '3.14159:literal' looks ugly, we'll just say '3.14159'. It's not
like non-integers can be confused for anything but literals.
Once I tried to turn reagent values into doubles, I uncovered a bug:
arithmetic using signed integers is busted; if either operand of
subtraction is unsigned the result is unsigned as well. If it needs to
be negative: ka-boom. It was only masked because I was eventually
storing the result in a long long int, where it was out of range, and so
overflowing into the correct signed value. Once I switched to doubles
the unsigned value would indeed fit without overflowing. Ka-boom.
Yet another reminder that unsigned integers suck. I started using them
mostly to avoid warnings in loops when comparing with .size(), which is
usually a size_t.
Who knows what other crap lurks here. Just use signed integers
everywhere. (And avoid bitwise operators.)
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..now that we support non-integers.
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Mu allows us to use multiple ingredients/products without commas, but
make sure we don't.
$ grep "<- [^ ]\+ [^#\[,]* [^#\[,]*$" *
$ grep "^[ ]*[^ #,][^#,]* [^#,]* <- " *
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I added one test to check that divide can return a float, then hacked at
the rippling failures across the entire entire codebase until all tests
pass. Now I need to look at the changes I made and see if there's a
system to them, identify other places that I missed, and figure out the
best way to cover all cases. I also need to show real rather than
encoded values in the traces, but I can't use value() inside reagent
methods because of the name clash with the member variable. So let's
take a snapshot before we attempt any refactoring. This was non-trivial
to get right.
Even if I convince myself that I've gotten it right, I might back this
all out if I can't easily *persuade others* that I've gotten it right.
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Also a bugfix in break to label, because I noticed the screen wasn't
being cleaned up on quit.
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Lots mixed into this commit:
some off-by-one errors in display.cc
a new transform to translate jump labels that I'd somehow never gotten around to supporting
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All primitives now always write to all their products. If a product is
not used that's fine, but if an instruction seems to expect too many
products mu will complain.
In the process, many primitives can operate on more than two ingredients
where it seems intuitive. You can add or divide more than two numbers
together, copy or negate multiple corresponding locations, etc.
There's one remaining bit of ugliness. Some instructions like
get/get-address, index/index-address, wait-for-location, these can
unnecessarily load values from memory when they don't need to.
Useful vim commands:
%s/ingredients\[\([^\]]*\)\]/ingredients.at(\1)/gc
%s/products\[\([^\]]*\)\]/products.at(\1)/gc
.,$s/\[\(.\)]/.at(\1)/gc
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I've tried to update the Readme, but there are at least a couple of issues.
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