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See `cannot_write_tests_for`.
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It also seems useful that the number maps to the name of the file the
sandbox is saved in. However this mapping is currently a happy accident
and not actually tested.
I'm starting to switch gears and help make the editor useable with
many many sandboxes. This is just the first step of several.
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Also start auto-abandoning addresses when their refcount returns to 0.
I'm mixing this auto-abandon support with my earlier/hackier support for
automatically abandoning default-space created by 'local-scope'. We need
to flesh out the story for automatically reclaiming memory using
C++-style destructors.
But that's a value-add. Memory corruption is far more important to avoid
than memory *leaks*.
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We don't yet actually maintain the refcount. That's next.
Hardest part of this was debugging the assume-console scenarios in layer
85. That took some detailed manual diffing of traces (because the output
of diff was no good).
New tracing added in this commit add 8% to .traces LoC. Commented out
trace() calls (used during debugging) make that 45%.
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I had to undo some over-zealous changes in 2576.
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Separate core mu tests from those loaded from the commandline.
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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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I realize that my current doesn't allow nesting a:b:c linear type syntax
inside a dilated property. So you can't currently say:
(recipe address:number)
Need to fix that at some point. Non-trivial since linear syntax is
oblivious to dilated syntax. I should probably make the dilated syntax
more fundamental and introduce it at an earlier layer.
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Reorganize layers in preparation for a better way to manage heap
allocations without ever risking use-after-free errors.
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Still need to type-check it, though.
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We want to use the type 'recipe' for recipe *variables*, because it
seems nicer to say `recipe number -> number` rather than recipe-ordinal,
etc. To support this we'll allow recipe names to be mentioned without
any type.
This might make a couple of places in this commit more brittle. I'm
dropping error messages, causing them to not happen in some situations.
Maybe I should just bite the bullet and require an explicit
:recipe-literal. We'll see.
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Reorganize layers in preparation for a better, more type-safe
implementation of first-class and higher-order recipes.
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I still need it in some situations because I have no way to set a
non-zero default for an optional ingredient. Open question..
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Eventually you'll need to create a doubly-linked list, and `isolated`
won't save you then.
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Thanks Caleb Couch.
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Still can't print non-integer numbers, so this is a bit hacky.
The big consequence is that you can't print literal characters anymore
because of our rules about how we pick which variant to statically
dispatch to. You have to save to a character variable first.
Maybe I can add an annotation to literals..
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Thanks Caleb Couch.
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update html
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- notes
bug in edit/ triggers in immutable but not master branch
bug triggered by changes to layer 059: we're finding an unspecialized call to 'length' in 'append_6'
hard to debug because trace isn't complete
just bring out the big hammer: use a new log file
length_2 from recipes.mu is not being deleted (bug #1)
so reload doesn't switch length to length_2 when variant_already_exists (bug #2)
so we end up saving in Recipe for a primitive ordinal
so no valid specialization is found for 'length' (bug #3)
why doesn't it trigger in a non-interactive scenario?
argh, wasn't checking for an empty line at end. ok, confidence restored.
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First some baseline tests that should never trigger warnings.
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I wasn't seeing errors because I wasn't using /contained-in in products
yet. But it seems to work fine even after.
One reason this isn't an invasive change is that it's opt-in. Most of
the time it isn't triggered. You have to add the /contained-in check to
trigger a check. But that's just like regular const checks in other
languages: if you don't specify immutability you get no checks.
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If a product is contained-in some ingredient, then the caller will check
the product for mutations as well. For example, consider this
linked-list operation:
b:address:list:number <- next a:address:list:number
If 'a' is immutable in the surrounding recipe, you probably want 'b' to
be immutable as well. You can achieve this by giving 'next' the
following header (ignoring shape-shifting):
recipe next a:address:list:number -> b:address:list:number/contained-in:a
This is the theory, anyway. Rather to my surprise, this doesn't trigger
any issues with existing code. That's probably too good to be true.
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