As part of this, move functions that seem reasonable to make out-of-line
to a separate `_impl.h` header file that is only included where the
explicit instantiation _definition_ is provided.
By using explicit instantiation we can make these templates behave more
like non-template classes in terms of supporting out-of-line definitions
that don't need to be compiled by every translation unit. The set of
eventual instantiations here is fundamentally known, and there tend to
be headers that define a canonical "leaf" type where it makes sense to
trigger the explicit instantiation.
Where we already had a `.cpp` file to put the explicit instantiation
definition, use it. But in some places we didn't have such a `.cpp` file
so this PR adds those.
This also requires that we have precise constraints on APIs that _can't_
be instantiated for specific argument types, as now we don't do this
lazily.
Combined, this appears to reduce the sum of object file sizes in the
`check` directory by almost 40% (122mb -> 74mb) in my measurement.
My actual goal was to improve compile times, but so far I don't have a
great methodology for measuring these... But the object file size
reduction seems to confirm this is a net win and likely represents a
non-trivial improvement in compile time.
Assisted-by: Antigravity with Gemini
- Distinguish attached vs. unattached constants.
- Add some missing value stores to the top-level output.
- Add missing fields to various Print methods.
The IdTag knows the type of the Id its tagging and the type of the Id
being used as the tag. This prevents mixing up tagged and untagged ids,
and avoids having to work with untyped integers.
Adds an Untagged marker struct that's used as the tag type in IdTag when
no tag is desired.
The complexity of ConstantIds and TypeIds became a bit visible: TypeIds
are concrete ConstantIds. And ConstantIds have two different tagging
schemes, one for concrete and one for symbolic ids. And ConstantIds are
actually re-cast InstIds with the same index. The LoweredTypeStore needs
to work with tagged TypeIds, but the tags actually come from an InstId
store in ConstantValueStore. Now this is expressed in the type system by
getting the tags for TypeIds from the ConstantValueStore.
ValueStores without an TagId type parameter are now visibly untagged.
IdTag is now only default constructible when it does not have a tag,
which means ValueStore is only default constructible when the TagId is
untagged. This forces tagged value stores to be constructed correctly
with a tag at compile time, and untagged ones to be constructed without.
FixedSizeValueStore has overloads for dealing with tagged and untagged
Ids, since it can't default-construct ValueStore for tagged ids, and no
longer requires passing in default-constructed tags when there is no tag
in the ids.
This requires declared FacetTypes to hold NamedConstraintIds (along with
a specific) that are named in an extend or impls requirement. We add
support to stringify and formatter to display the named constraints in
the facet type, and special case when a facet type contains a single
extend named constraint, like we did for a single extend interface.
This means that `RequireIndentifiedFacetType` can now fail, if the facet
type contains a forward-declared named constraint. Add the appropriate
diagnostics for each call to this function, and note the ones that
should change to `RequireCompleteFacetType` in the future with TODOs.
We also add tests for using facet types that can or can't be identified,
or completed, with named constraints in them.
`SpecificInterface` seems oddly placed. It appears to be in ids.h just
because it's used by typed_insts.h, but maybe that should be factored
differently? We typically aren't having typed_insts.h depend on non-ID
types. To that end, I'm splitting it out to its own file so that at
least I'm not adding a `ValueStore` dep inside ids.h
---------
Co-authored-by: Richard Smith <richard@metafoo.co.uk>
Chandler Carruth
Geoff Romer
Dana Jansens
Jon Ross-PerkinsandRichard Smith