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Make BindSymbolicName the canonical form of a FacetValue wrapping the BindSymbolicName (#6107)

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If a `BindSymbolicName` is converted to `type` and then to its exact
`FacetType`, we get a `FacetValue` wrapping the `BindSymbolicName` but
providing no different information: it has the same witnesses and
`FacetType` as the original `BindSymbolicName`. Yet it is a different
constant value, creating multiple canonical forms with the same meaning.
Now we make that `FacetValue` with the same `FacetType` as the
`BindSymbolicName` it wraps evaluate back to the `BindSymbolicName`,
making it the unique canonical form.

This makes the "shortcut" in convert for avoiding impl lookup when
converting from `FacetAccessType` to `FacetType` in this exact scenario
work the same as doing the full impl lookup.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Dana Jansens
2025-09-23 22:11:11 +00:00
committed by GitHub
co-authored by Richard Smith
parent 737c329aba
commit 82679e6689
154 changed files with 2258 additions and 2660 deletions
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toolchain/check/testdata/interop/cpp/function/pointer.carbon
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@@ -330,8 +330,8 @@ fn F() {
// CHECK:STDOUT: %Copy.impl_witness.692: <witness> = impl_witness imports.%Copy.impl_witness_table.53c, @ptr.as.Copy.impl(%S) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.type.bf9: type = fn_type @ptr.as.Copy.impl.Op, @ptr.as.Copy.impl(%S) [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.1cb: %ptr.as.Copy.impl.Op.type.bf9 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet.7cc: %Copy.type = facet_value %ptr.5c7, (%Copy.impl_witness.692) [concrete]
// CHECK:STDOUT: %.dce: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet.7cc [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %ptr.5c7, (%Copy.impl_witness.692) [concrete]
// CHECK:STDOUT: %.dce: type = fn_type_with_self_type %Copy.Op.type, %Copy.facet [concrete]
// CHECK:STDOUT: %ptr.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %ptr.as.Copy.impl.Op.1cb, @ptr.as.Copy.impl.Op(%S) [concrete]
// CHECK:STDOUT: %.c5d: type = cpp_overload_set_type @Copy.Op [concrete]
// CHECK:STDOUT: %empty_struct: %.c5d = struct_value () [concrete]