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Skip ImplWitnessTable::elements_id when generating fingerprints (#7629)

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Implementing interface modifiers causes an infinite loop when generating
fingerprints because the witness value generates a fingerprint that's
dependent on something dependent on the witness value. We've debugged
this to the witness table's `elements_id` field.

This hack is a workaround for creating a new block type whose value is
not codependent with its identity.

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Christopher Di Bella
2026-08-11 22:39:30 +00:00
committed by GitHub
co-authored by Richard Smith
parent cb5e9b6555
commit 4ea5ef45dd
368 changed files with 11718 additions and 11723 deletions
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toolchain/check/testdata/interop/cpp/function/import/struct.carbon
Vendored
+8 -8
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@@ -662,8 +662,8 @@ fn F() {
// CHECK:STDOUT: %S.Op: %S.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.85f: <witness> = custom_witness (%S.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.fc7: %Default.type = facet_value %S, (%custom_witness.85f) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.a26: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.670, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.fc7) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %S, (%DefaultOrUnformed.impl_witness.a26) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.c8f: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.fc7) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %S, (%DefaultOrUnformed.impl_witness.c8f) [concrete]
// CHECK:STDOUT: %S.cpp_destructor.type: type = fn_type @S.cpp_destructor [concrete]
// CHECK:STDOUT: %S.cpp_destructor: %S.cpp_destructor.type = struct_value () [concrete]
// CHECK:STDOUT: }
@@ -686,7 +686,7 @@ fn F() {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import_ref.c2f: @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op.type (%T.as_type.as.DefaultOrUnformed.impl.Op.type.0c9) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.as_type.as.DefaultOrUnformed.impl.Op.cfe)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.670 = impl_witness_table (%Core.import_ref.c2f), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.162 = impl_witness_table (%Core.import_ref.c2f), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%s.param: %S) {
@@ -698,7 +698,7 @@ fn F() {
// CHECK:STDOUT: %addr: %ptr.237 = addr_of %.loc8
// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
// CHECK:STDOUT: %x.var: ref %S = var_storage %x.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%S, (constants.%DefaultOrUnformed.impl_witness.a26) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%S, (constants.%DefaultOrUnformed.impl_witness.c8f) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc10_24.1: %DefaultOrUnformed.type = converted constants.%S, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc10_24.1 [concrete = constants.%S]
// CHECK:STDOUT: %.loc10_24.2: type = converted %.loc10_24.1, %as_type [concrete = constants.%S]
@@ -791,8 +791,8 @@ fn F() {
// CHECK:STDOUT: %O.Op: %O.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.9b4: <witness> = custom_witness (%O.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.240: %Default.type = facet_value %O, (%custom_witness.9b4) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.3bc: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.670, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.240) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %O, (%DefaultOrUnformed.impl_witness.3bc) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.6b8: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.162, @T.as_type.as.DefaultOrUnformed.impl(%Default.facet.240) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %O, (%DefaultOrUnformed.impl_witness.6b8) [concrete]
// CHECK:STDOUT: %O.cpp_destructor.type: type = fn_type @O.cpp_destructor [concrete]
// CHECK:STDOUT: %O.cpp_destructor: %O.cpp_destructor.type = struct_value () [concrete]
// CHECK:STDOUT: }
@@ -811,7 +811,7 @@ fn F() {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import_ref.c2f: @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op.type (%T.as_type.as.DefaultOrUnformed.impl.Op.type.0c9) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DefaultOrUnformed.impl.%T.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.as_type.as.DefaultOrUnformed.impl.Op.cfe)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.670 = impl_witness_table (%Core.import_ref.c2f), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.162 = impl_witness_table (%Core.import_ref.c2f), @T.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%s.param: %S) {
@@ -823,7 +823,7 @@ fn F() {
// CHECK:STDOUT: %addr: %ptr.ad4 = addr_of %.loc8
// CHECK:STDOUT: %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr)
// CHECK:STDOUT: %x.var: ref %O = var_storage %x.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%O, (constants.%DefaultOrUnformed.impl_witness.3bc) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%O, (constants.%DefaultOrUnformed.impl_witness.6b8) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc9_22.1: %DefaultOrUnformed.type = converted constants.%O, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc9_22.1 [concrete = constants.%O]
// CHECK:STDOUT: %.loc9_22.2: type = converted %.loc9_22.1, %as_type [concrete = constants.%O]