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Thanks Ella Couch for finding this bug. It's helped me find errors in
mu's code itself.
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All my attempts at staging this change failed with this humongous commit
that took all day and involved debugging three monstrous bugs. Two of
the bugs had to do with forgetting to check the type name in the
implementation of shape-shifting recipes. Bug #2 in particular would
cause core tests in layer 59 to fail -- only when I loaded up edit/! It
got me to just hack directly on mu.cc until I figured out the cause
(snapshot saved in mu.cc.modified). The problem turned out to be that I
accidentally saved a type ingredient in the Type table during
specialization. Now I know that that can be very bad.
I've checked the traces for any stray type numbers (rather than names).
I also found what might be a bug from last November (labeled TODO), but
we'll verify after this commit.
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Start using type names from the type tree rather than the property tree
in most places. Hopefully the only occurrences of
'properties.at(0).second' left are ones where we're managing it. Next we
can stop writing to it.
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It's only for transient debugging.
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Stack of plans for cleaning up replace_type_ingredients() and a couple
of other things, from main problem to subproblems:
include type names in the type_tree rather than in the separate properties vector
make type_tree and string_tree real cons cells, with separate leaf nodes
redo the vocabulary for dumping various objects:
do we really need to_string and debug_string?
can we have a version with *all* information?
can we have to_string not call debug_string?
This commit nibbles at the edges of the final task, switching from
member method syntax to global function like almost everything else. I'm
mostly using methods just for STL in this project.
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I was finding it hard to wrap around the directionality of calls with
'lhs' and 'rhs'. Seems to work better with 'to' and 'from'. Let's see.
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This is the one major refinement on the C programming model I'm planning
to introduce in mu. Instead of Rust's menagerie of pointer types and
static checking, I want to introduce just one new type, and use it to
perform ref-counting at runtime.
So far all we're doing is updating new's interface. The actual
ref-counting implementation is next.
One implication: I might sometimes need duplicate implementations for a
recipe with allocated vs vanilla addresses of the same type. So far it
seems I can get away with just always passing in allocated addresses;
the situations when you want to pass an unallocated address to a recipe
should be few and far between.
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Literal '0' ingredients should map to numbers before addresses.
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/raw is to express absolute addresses
/unsafe is to sidestep type-checking in test setup
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Got that idea to work with a special-case for 'new'. Requires parsing
new's first ingredient, performing the replacement, and then turning it
back into a string. I didn't want to replace NEW with ALLOCATE right
here, because then it messes with my invariant that transform should
never see a naked ALLOCATE.
Layer 11 still not working, but everything else is. Let's clean up
before we diagnose the new breakage.
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Yup, type ingredients were taking size 1 by default.
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No, my idea was abortive. My new plan was to run no transforms for
generic recipes, and instead only run them on concrete specializations
as they're created.
The trouble with this approach is that new contains a type specification
in its ingredient which apparently needed to be transformed into an
allocate before specialization.
But no, how was that working? How was new computing size based on type
ingredients? It might have been wrong all along.
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I'm still seeing all sorts of failures in turning on layer 11 of edit/,
so I'm backing away and nailing down every culprit I run into. First up:
stop accidentally inserting empty objects into maps during lookups.
Commands run:
$ sed -i 's/\(Recipe_ordinal\|Recipe\|Type_ordinal\|Type\|Memory\)\[\([^]]*\)\] = \(.*\);/put(\1, \2, \3);/' 0[1-9]*
$ vi 075scenario_console.cc # manually fix up Memory[Memory[CONSOLE]]
$ sed -i 's/\(Memory\)\[\([^]]*\)\]/get_or_insert(\1, \2)/' 0[1-9]*
$ sed -i 's/\(Recipe_ordinal\|Type_ordinal\)\[\([^]]*\)\]/get(\1, \2)/' 0[1-9]*
$ sed -i 's/\(Recipe\|Type\)\[\([^]]*\)\]/get(\1, \2)/' 0[1-9]*
Now mu dies pretty quickly because of all the places I try to lookup a
missing value.
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At the lowest level I'm reluctantly starting to see the need for errors
that stop the program in its tracks. Only way to avoid memory corruption
and security issues. But beyond that core I still want to be as lenient
as possible at higher levels of abstraction.
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Now duplex-list is fully non-generic and only works with characters. But
we'll fix that in a bit..
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Already I'm finding type errors in the programming environment.
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Always show recipe name where error occurred. But don't show internal
'interactive' name for sandboxes, that's just confusing.
What started out as warnings are now ossifying into errors that halt all
execution. Is this how things went with C and Unix as well?
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Front-loads it a bit more than I'd like, but the payoff is that other
recipes will now be able to describe the type checks right next to their
operation.
I'm also introducing a new use of /raw with literals to indicate unsafe
typecasts.
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That way we only have to check each static instruction once, rather than
every time it runs.
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Turns out the default format for printing floating point numbers is
neither 'scientific' nor 'fixed' even though those are the only two
options offered. Reading the C++ standard I found out that the default
(modulo locale changes) is basically the same as the printf "%g" format.
And "%g" is basically the shorter of:
a) %f with trailing zeros trimmed
b) %e
So we'll just do %f and trim trailing zeros.
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Finally terminate the experiment of keeping debug prints around. I'm
also going to give up on maintaining counts.
What we really need is two kinds of tracing:
a) For tests, just the domain-specific facts, organized by labels.
b) For debugging, just transient dumps to stdout.
b) only works if stdout is clean by default.
Hmm, I think this means 'stash' should be the transient kind of trace.
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This can happen if 'canonize' fails. Make sure it doesn't kill mu.
Thanks Caleb Couch.
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Region to click on to edit is now reduced to just the menu bar for the
sandbox (excluding the 'x' for deleting the sandbox). The symmetry there
might be useful, but we'll see if the relative click area is
in line with how commonly the actions are performed.
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Now fix the proximal cause of the write to address 0.
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Should be a little bit more mnemonic.
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First step to reducing typing burden. Next step: inferring types.
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Also reorganize my miscellaneous hacky primitives.
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Also standardized warnings.
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More verbose, but it saves trouble when debugging; there's never
something you thought should be traced but just never came out the other
end.
Also got rid of fatal errors entirely. Everything's a warning now, and
code after a warning isn't guaranteed to run.
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Also, turns out I haven't been building 999spaces.cc in my default
build. Now fixed.
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