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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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Now that we no longer have non-shared addresses, we can just always
track refcounts for all addresses.
Phew!
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This should eradicate the issue of 2771.
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Turns out that LLVM/Clang still doesn't support multiplying 64-bit
numbers on a 32-bit platform.
https://llvm.org/bugs/show_bug.cgi?id=14469
This is just a quick fix, because it turns out I don't have any integer
multiplication anywhere else. In the long run I think I'm going to just
drop 'long long int' in favor of 'int'. Overflow is less likely than
this configuration on somebody's machine.
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This uncovered a second bug (besides 2766) -- I was manually doing the
work of 'new-fake-console' inside 'assume-console' but forgetting to
increment a refcount.
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Include type names in the type tree. Though we aren't using them yet.
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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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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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