| Commit message (Collapse) | Author | Age | Files | Lines |
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More reorganization in preparation for implementing recursive abandon().
Refcounts are getting incredibly hairy. I need to juggle containers
containing other containers, and containers *pointing* to other
containers. For a while I considered getting rid of address_element_info
entirely and just going by types for every single
update_refcount. But that's definitely more work, and it's unclear that
things will be cleaner/shorter/simpler. I haven't measured the speedup,
but it seems worth optimizing every pointer copy to make sure we aren't
manipulating types at runtime.
The key insight now is a) to continue to compute information about
nested containers at load time, because that's the common case when
updating refcounts, but b) to compute information about *pointed* values
at run-time, because that's the uncommon case.
As a result, we're going to cheat in the interpreter and use type
information at runtime just for abandon(), just because the
corresponding task when we get to a compiler will be radically
different. It will still be tractable, though.
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Update refcounts of address elements when copying containers.
Still lots to do; see todo list at end of 036refcount.cc.
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Since I switched to a Mac laptop (commit 2725) I've been lax in running
test_all_layers because I have to ssh into a server and whatnot. I
should just get CI setup somewhere..
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More consistent labeling of waypoints. Use types only when you need to
distinguish between function overloadings. Otherwise just use variable
names unless it's truly not apparent what they are (like that the result
is a recipe in "End Rewrite Instruction").
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This commit covers instructions 'put', 'put-index' and 'maybe-convert'.
Next up are the harder ones: 'copy' and 'merge'. In these cases there's
a non-scalar being copied, and we need to figure out which locations
within it need to update their refcount.
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It's a bit of a trade-off because we need to store copies of
container metadata in each reagent (to support shape-shifting
containers), and metadata is not lightweight and will get heavier. But
it'll become more unambiguously useful when we switch to a compiler.
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This continues a line of thought sparked in commit 2831. I spent a while
trying to avoid calling size_of() at transform-time, but there's no
getting around the fact that translating names to addresses requires
knowing how much space they need.
This raised the question of what happens if the size of a container
changes after a recipe using it is already transformed. I could go down
the road of trying to detect such situations and redoing work, but that
massively goes against the grain of my original design, which assumed
that recipes don't get repeatedly transformed. Even though we call
transform_all() in every test, in a non-testing run we should be loading
all code and calling transform_all() just once to 'freeze-dry'
everything.
But even if we don't want to support multiple transforms it's worth
checking that they don't occur. This commit does so in just one
situation. There are likely others.
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Be more consistent that 'return' is the name of the instruction, and
'reply' just a synonym. Maybe I should take it out. It wouldn't affect
the recipe/ingredient terminology while I teach..
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Finally after much massaging, the 'address' and 'new' layers are
adjacent.
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Show more thorough information about instructions in the trace, but keep
the original form in error messages.
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As outlined at the end of 2797. This worked out surprisingly well. Now
the snapshotting code touches fewer layers, and it's much better
behaved, with less need for special-case logic, particularly inside
run_interactive(). 30% slower, but should hopefully not cause any more
bugs.
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Simplify 2790 by simply not computing any type->value inside
parse_type_tree. It now only generates names, and it turns out the
consumers handle the absence of values anyway. Now parse_type_tree no
longer pollutes the Type_ordinal table with type ingredients.
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The issue alluded to in the previous 2789 is now fixed. I'm not happy
with my solution, though. I pollute Type_ordinal with type ingredients
in parse_type_tree and simply ignore such entries later on. I'd much
rather avoid the pollution in the first place, but I'm not sure how to
do that..
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This should eradicate the issue of 2771.
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I'm dropping all mention of 'recipe' terminology from the Readme. That
way I hope to avoid further bike-shedding discussions while I very
slowly decide on the right terminology with my students.
I could be smarter in my error messages and use 'recipe' when code uses
it and 'function' otherwise. But what about other words like ingredient?
It would all add complexity that I'm not yet sure is worthwhile. But I
do want separate experiences for veteran programmers reading about Mu on
github and for people learning programming using Mu.
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Only Hide_errors when strictly necessary. In other places let test
failures directly show the unexpected error.
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Ok, we don't need that check after all, because the
type_ingredient_names.empty() check earlier in the layer prevents it
from ever triggering.
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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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Include type names in the type tree. Though we aren't using them yet.
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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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Still not done, though:
a) There's a few memory leaks to track down, including one in hash from
2668.
b) replace_type_ingredients has gotten *even* uglier. I need to rethink
it.
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Eliminated a few holes, gained more clarity on the shape of others.
Maybe I was sleep-deprived, but this was really hard until I wrote a few
unit tests directly on replace_type_ingredient.
Still one flaw remaining: the type-checker isn't smart enough to handle
'merge' for all the new cases. Tests pass since we don't use those
features outside C++ tests yet.
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I've been gradually Greenspunning reagents. Just go all the way.
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The rule is: a container type's size must be fixed. Arrays can violate
this rule if the array length isn't included in the type. But we haven't
been warning about this, and 'new' has been silently turning array
elements to be empty.
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