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More thorough redo of commit 2767 (Mar 12), which was undone in commit
2810 (Mar 24). It's been a long slog. Next step: write a bunch of mu
code in the edit/ app in search of bugs.
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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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This is hopefully quite thorough. I handle nested containers, as well as
exclusive containers that might contain addresses only when the tag has
a specific value.
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To support exclusive containers a recursive answer will be easier to
reuse than the current iterative one. First step: figure out the precise
boundary and interface of the recursive function.
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First genuine Travis CI failure fixed! May there be many more.
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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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Can't believe I didn't run tests after 2932.
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A better primitive: manage refcounts for an assignment without actually
doing the assignment itself. This way we can add refcounts as a new,
independent bit of bookkeeping without littering early returns and
duplicate code paths.
(OCD: commit number.)
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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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