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Make C++ types impl Core.Default. (#6962)

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C++ classes that are default-constructible now implement `Core.Default`
by calling the default constructor.
This commit is contained in:
Richard Smith
2026-03-25 21:07:24 +00:00
committed by GitHub
parent 311670c84a
commit 37b238fa28
49 changed files with 1069 additions and 426 deletions
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toolchain/check/testdata/interop/cpp/template/template_template_param.carbon
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+15 -10
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@@ -86,16 +86,21 @@ var x: Cpp.TwoTemplates(Cpp.A, true);
// CHECK:STDOUT: %TwoTemplates: type = class_type @TwoTemplates [concrete]
// CHECK:STDOUT: %pattern_type.2b7: type = pattern_type %TwoTemplates [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.6c6: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%T) [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.ae1: %T.as.DefaultOrUnformed.impl.Op.type.6c6 = struct_value () [symbolic]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.cea: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table, @T.as.DefaultOrUnformed.impl(%TwoTemplates) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTemplates, (%DefaultOrUnformed.impl_witness.cea) [concrete]
// CHECK:STDOUT: %Default.type: type = facet_type <@Default> [concrete]
// CHECK:STDOUT: %T.50c: %Default.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.binding.as_type.as.DefaultOrUnformed.impl.Op.type.8d1: type = fn_type @T.binding.as_type.as.DefaultOrUnformed.impl.Op, @T.binding.as_type.as.DefaultOrUnformed.impl(%T.50c) [symbolic]
// CHECK:STDOUT: %T.binding.as_type.as.DefaultOrUnformed.impl.Op.185: %T.binding.as_type.as.DefaultOrUnformed.impl.Op.type.8d1 = struct_value () [symbolic]
// CHECK:STDOUT: %TwoTemplates.Op.type: type = fn_type @TwoTemplates.Op [concrete]
// CHECK:STDOUT: %TwoTemplates.Op: %TwoTemplates.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.6e5: <witness> = custom_witness (%TwoTemplates.Op), @Default [concrete]
// CHECK:STDOUT: %Default.facet.90a: %Default.type = facet_value %TwoTemplates, (%custom_witness.6e5) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.18b: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.608, @T.binding.as_type.as.DefaultOrUnformed.impl(%Default.facet.90a) [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %TwoTemplates, (%DefaultOrUnformed.impl_witness.18b) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.01d: @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op.type (%T.as.DefaultOrUnformed.impl.Op.type.6c6) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op (constants.%T.as.DefaultOrUnformed.impl.Op.ae1)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table = impl_witness_table (%Core.import_ref.01d), @T.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.9c6: @T.binding.as_type.as.DefaultOrUnformed.impl.%T.binding.as_type.as.DefaultOrUnformed.impl.Op.type (%T.binding.as_type.as.DefaultOrUnformed.impl.Op.type.8d1) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.binding.as_type.as.DefaultOrUnformed.impl.%T.binding.as_type.as.DefaultOrUnformed.impl.Op (constants.%T.binding.as_type.as.DefaultOrUnformed.impl.Op.185)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.608 = impl_witness_table (%Core.import_ref.9c6), @T.binding.as_type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
@@ -109,14 +114,14 @@ var x: Cpp.TwoTemplates(Cpp.A, true);
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTemplates, (constants.%DefaultOrUnformed.impl_witness.cea) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%TwoTemplates, (constants.%DefaultOrUnformed.impl_witness.18b) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc7_38.1: %DefaultOrUnformed.type = converted constants.%TwoTemplates, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc7_38.1 [concrete = constants.%TwoTemplates]
// CHECK:STDOUT: %.loc7_38.2: type = converted %.loc7_38.1, %as_type [concrete = constants.%TwoTemplates]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.loc7_1: ref %TwoTemplates = splice_block file.%x.var [concrete = file.%x.var] {}
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %TwoTemplates to %.loc7_1 = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign file.%x.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %T.binding.as_type.as.DefaultOrUnformed.impl.Op.call: init %TwoTemplates to %.loc7_1 = call %T.binding.as_type.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign file.%x.var, %T.binding.as_type.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: