| Commit message (Collapse) | Author | Age | Files | Lines |
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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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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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The old approach of ad hoc boosts and penalties based on various
features was repeatedly running into exceptions and bugs. New
organization: multiple tiered scores interleaved with tie-breaks. The
moment one tier yields one or more candidates, we stop scanning further
tiers. Just break ties and return.
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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 uncovered a bug where I've been forgetting the directionality of
arguments to types_coercible().
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Some more structure to transforms, and flattening of dependencies
between them.
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In general you only want to specify one transform in terms of
(before/after) another if the other direction wouldn't work. Otherwise
try to make it work by just pushing transforms at the start/end of the
list.
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More cleanup. Haven't bothered to figure out why the trace for
specialize_with_literal_4 is repeatedly perturbed.
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Eliminate one of several hacky type-check helpers; they've been
proliferating lately.
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'append' also implicitly calls 'to-text' unless there's a better
variant.
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Literal '0' ingredients should map to numbers before addresses.
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It's just the other direction we want to avoid.
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/raw is to express absolute addresses
/unsafe is to sidestep type-checking in test setup
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Fix the drawback in the previous commit: if an ingredient is just a
literal 0 we'll skip its type-checking and hope to map type ingredients
elsewhere.
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I was failing to specialize calls containing literals. And then I had to
deal with whether literals should map to numbers or characters. (Answer:
both.)
One of the issues that still remains: shape-shifting recipes can't be
called with literals for addresses, even if it's 0.
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Lessons with Caleb uncovered a problem with type ingredients: I can call
shape-shifting recipes like 'push' from the commandline but not inside
the edit/ or sandbox/ apps.
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The rule is, an address ingredient is only modifiable if:
a) it's also a product
b) it's /contained-in some other ingredient+product
Only if an ingredient is a modifiable can you:
a) call get-address or index-address on it (the only way to write to it)
b) call other recipes that also return it in a product
I still don't check copies of the address. That's next.
Core mu passes this check, but none of the example apps do. edit/ and
sandbox/ are known to fail.
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I'd not paid any attention to it so far, but I need to do so from now
on.
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Starting to leave commented out prints again out of desperation.
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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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A new externality is starting to make its presence felt.
Until I sort this out it's going to be hard to finish making duplex-list
generic.
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Deduce operation id from name during transform rather than load, so that
earlier transforms have a chance to modify the name.
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Once a student has gotten used to recipes and ingredients using the
staged 'next-ingredient' approach there's no reason to avoid
conventional function headers. As an added bonus we can now:
a) check that all 'reply' instructions in a recipe are consistent
b) deduce what to reply without needing to say so everytime
c) start thinking about type parameters for recipes (generic functions!)
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I no longer have any null types! That raises confidence that I'm on the
right track.
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Still very incomplete:
a) we perform the check at runtime
b) tests for edit and sandbox apps no longer work; we can't fix them
until we get type parameters in both containers and recipes (because
list and list operations need to become generic).
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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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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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