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carbon-lang/toolchain/check/testdata/interop/cpp/enum/copy.carbon
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Christopher Di Bella f7cd39428e Add Destroy.SubobjectDestroy as a temporary replacement for Destroy.Op (#7773) 
This change partially implements [PR #7362], which revises how objects
are destroyed. It is a partial implementation for two reasons:

1. This change moves `Destroy.Op`'s current behaviour into
`Destroy.SubobjectDestroy`, but it doesn't add support for objects with
non-trivial destruction.
2. `Destroy.SubobjectDestroy` is a workaround for `require impls
SubobjectDestroy`. We aren't able to use the latter until the dependents
add their requirements' implementations to their own witness tables.

[PR #7362]: https://github.com/carbon-language/carbon-lang/pulls/7362
2026-09-24 00:06:28 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/enum/copy.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/enum/copy.carbon
// --- enum.h
enum Enum : short { a, b, c };
// --- copy_enum.carbon
library "[[@TEST_NAME]]";
import Cpp library "enum.h";
//@dump-sem-ir-begin
fn F() {
var a: Cpp.Enum = Cpp.Enum.a;
a = Cpp.Enum.b;
}
//@dump-sem-ir-end
// CHECK:STDOUT: --- copy_enum.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Enum: type = class_type @Enum [concrete]
// CHECK:STDOUT: %pattern_type.926: type = pattern_type %Enum [concrete]
// CHECK:STDOUT: %a.patt: %pattern_type.926 = ref_binding_pattern a [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.926 = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %int_0: %Enum = int_value 0 [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.7f5: type = fn_type @Copy.WithSelf.Op.2 [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.416: %Copy.WithSelf.Op.type.7f5 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.bab: <witness> = custom_witness (%Copy.WithSelf.Op.416), @Copy [concrete]
// CHECK:STDOUT: %Copy.facet.512: %Copy.type = facet_value %Enum, (%custom_witness.bab) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.252: type = fn_type @Copy.WithSelf.Op.1, @Copy.WithSelf(%Copy.facet.512) [concrete]
// CHECK:STDOUT: %.1eb: type = fn_type_with_self_type %Copy.WithSelf.Op.type.252, %Copy.facet.512 [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.bound.996: <bound method> = bound_method %int_0, %Copy.WithSelf.Op.416 [concrete]
// CHECK:STDOUT: %int_1: %Enum = int_value 1 [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.bound.1a9: <bound method> = bound_method %int_1, %Copy.WithSelf.Op.416 [concrete]
// CHECK:STDOUT: %self.param_patt.95d: %pattern_type.926 = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.228: %pattern_type.926 = wrapper_binding_pattern self, %self.param_patt.95d [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfc: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc8 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01: %Destroy.WithSelf.SubobjectDestroy.type.dfc = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef0: type = fn_type @Destroy.WithSelf.Op.loc8 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403: %Destroy.WithSelf.Op.type.ef0 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.type.fbc: type = fn_type @Destroy.WithSelf.SelfDestruct.loc8 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.db3: %Destroy.WithSelf.SelfDestruct.type.fbc = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Enum = %Enum.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Enum.decl: type = class_decl @Enum [concrete = constants.%Enum] {} {}
// CHECK:STDOUT: %int_0: %Enum = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %int_1: %Enum = int_value 1 [concrete = constants.%int_1]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl: %Destroy.WithSelf.SubobjectDestroy.type.dfc = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc8 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.926 = ref_param_pattern [concrete = constants.%self.param_patt.95d]
// CHECK:STDOUT: %self.patt: %pattern_type.926 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.228]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %Enum = ref_param call_param0
// CHECK:STDOUT: %self: ref %Enum = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl: %Destroy.WithSelf.Op.type.ef0 = fn_decl @Destroy.WithSelf.Op.loc8 [concrete = constants.%Destroy.WithSelf.Op.403] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.926 = ref_param_pattern [concrete = constants.%self.param_patt.95d]
// CHECK:STDOUT: %self.patt: %pattern_type.926 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.228]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %Enum = ref_param call_param0
// CHECK:STDOUT: %self: ref %Enum = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %a.var: ref %Enum = var_storage %a.var_patt
// CHECK:STDOUT: %Cpp.ref.loc8_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8_24: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %a.ref.loc8: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %impl.elem0.loc8: %.1eb = impl_witness_access constants.%custom_witness.bab, element0 [concrete = constants.%Copy.WithSelf.Op.416]
// CHECK:STDOUT: %bound_method.loc8: <bound method> = bound_method %a.ref.loc8, %impl.elem0.loc8 [concrete = constants.%Copy.WithSelf.Op.bound.996]
// CHECK:STDOUT: %Copy.WithSelf.Op.call.loc8: init %Enum = call %bound_method.loc8(%a.ref.loc8) [concrete = constants.%int_0]
// CHECK:STDOUT: assign %a.var, %Copy.WithSelf.Op.call.loc8
// CHECK:STDOUT: %.loc8: type = splice_block %Enum.ref.loc8_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc8_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8_13: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: ref %Enum = wrapper_binding a, %a.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.926 = ref_binding_pattern a [concrete = constants.%a.patt]
// CHECK:STDOUT: %a.var_patt: %pattern_type.926 = var_pattern %a.patt [concrete = constants.%a.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a.ref.loc10: ref %Enum = name_ref a, %a
// CHECK:STDOUT: %Cpp.ref.loc10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc10: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %b.ref: %Enum = name_ref b, imports.%int_1 [concrete = constants.%int_1]
// CHECK:STDOUT: %impl.elem0.loc10: %.1eb = impl_witness_access constants.%custom_witness.bab, element0 [concrete = constants.%Copy.WithSelf.Op.416]
// CHECK:STDOUT: %bound_method.loc10: <bound method> = bound_method %b.ref, %impl.elem0.loc10 [concrete = constants.%Copy.WithSelf.Op.bound.1a9]
// CHECK:STDOUT: %Copy.WithSelf.Op.call.loc10: init %Enum = call %bound_method.loc10(%b.ref) [concrete = constants.%int_1]
// CHECK:STDOUT: assign %a.ref.loc10, %Copy.WithSelf.Op.call.loc10
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.bound: <bound method> = bound_method %a.var, constants.%Destroy.WithSelf.SelfDestruct.db3
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.call: init %empty_tuple.type = call %Destroy.WithSelf.SelfDestruct.bound(%a.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc8(%self.param: ref %Enum) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc8(%self.param: ref %Enum) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc8(%self.param: ref %Enum) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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