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05a7ecbd34253a978ab1259ebeb42d528b569538
carbon-lang/toolchain/check/testdata/class/import_member_cycle.carbon
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Christopher Di Bella 05a7ecbd34 Move SubobjectDestroy and SelfDestruct out of interface Destroy (#7942) 
Determining that a type has trivial destruction requires checking
whether all of its subobjects have trivial destruction and whether its
type has a custom witness for `Destroy.Op`. This isn't possible when
`Destroy` is the custodian for `Destroy.Op` and `SubobjectDestroy.Op`,
so we need to make `SubobjectDestroy` its own interface.

`Destroy.SelfDestruct` becomes a standalone function because it depends
on `SubobjectDestroy` and `Destroy` being implemented, and is also
responsible for generating any custom witnesses for both interfaces.
Making `SelfDestruct` an interface was experimented with, but this
required a blanket impl that caused issues for facet types.

`Destroy` depends on `SubobjectDestroy` to be implemented. We'd ideally
use `require impls SubobjectDestroy`, but it isn't complete yet, and it
also causes problems when `Destroy` is implemented inside the class
definition. We work around this by temporarily renaming the `Destroy`
interface to `DestroyImpl`, and introducing a constraint called
`Destroy` so that user code doesn't need to write `Core.SubobjectDestroy
& Core.Destroy`.
2026-10-26 21:35:01 +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
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/import_member_cycle.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/import_member_cycle.carbon
// --- a.carbon
library "[[@TEST_NAME]]";
class Cycle {
var a: Cycle*;
}
// --- b.carbon
library "[[@TEST_NAME]]";
import library "a";
fn Run() {
var unused a: Cycle*;
}
// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Cycle: type = class_type @Cycle [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Cycle [concrete]
// CHECK:STDOUT: %Cycle.elem: type = unbound_element_type %Cycle, %ptr [concrete]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: %ptr} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %struct_type.a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Cycle = %Cycle.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Cycle.decl: type = class_decl @Cycle [concrete = constants.%Cycle] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Cycle {
// CHECK:STDOUT: %field_decl: %Cycle.elem = field_decl a, element0, %ptr in [concrete] {
// CHECK:STDOUT: %Cycle.ref: type = name_ref Cycle, file.%Cycle.decl [concrete = constants.%Cycle]
// CHECK:STDOUT: %ptr: type = ptr_type %Cycle.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%struct_type.a [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Cycle
// CHECK:STDOUT: .Cycle = <poisoned>
// CHECK:STDOUT: .a = %field_decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Run.type: type = fn_type @Run [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Run: %Run.type = struct_value () [concrete]
// CHECK:STDOUT: %Cycle: type = class_type @Cycle [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Cycle [concrete]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: %ptr} [concrete]
// CHECK:STDOUT: %complete_type.de4: <witness> = complete_type_witness %struct_type.a [concrete]
// CHECK:STDOUT: %pattern_type.c3e: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %a.patt: %pattern_type.c3e = ref_binding_pattern a [concrete]
// CHECK:STDOUT: %a.var_patt: %pattern_type.c3e = var_pattern %a.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.5f6: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.5c0: %T.as.DefaultOrUnformed.impl.Op.type.5f6 = struct_value () [symbolic]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.1b4: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.856, @T.as.DefaultOrUnformed.impl(%ptr) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.63b: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%ptr) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.95c: %T.as.DefaultOrUnformed.impl.Op.type.63b = struct_value () [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %ptr, (%DefaultOrUnformed.impl_witness.1b4) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function %T.as.DefaultOrUnformed.impl.Op.95c, @T.as.DefaultOrUnformed.impl.Op(%ptr) [concrete]
// CHECK:STDOUT: %SelfDestruct.type: type = fn_type @SelfDestruct [concrete]
// CHECK:STDOUT: %SelfDestruct: %SelfDestruct.type = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %SubobjectDestroy.type: type = facet_type <@SubobjectDestroy> [concrete]
// CHECK:STDOUT: %T.09f: %SubobjectDestroy.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.type.dea: type = fn_type @T.as_type.as.DestroyImpl.impl.Op, @T.as_type.as.DestroyImpl.impl(%T.09f) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.6e5: %T.as_type.as.DestroyImpl.impl.Op.type.dea = struct_value () [symbolic]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.type.687: type = fn_type @SubobjectDestroy.WithSelf.Op.loc7 [concrete]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.30f: %SubobjectDestroy.WithSelf.Op.type.687 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b80: <witness> = custom_witness (%SubobjectDestroy.WithSelf.Op.30f), @SubobjectDestroy [concrete]
// CHECK:STDOUT: %SubobjectDestroy.facet.b36: %SubobjectDestroy.type = facet_value %ptr, (%custom_witness.b80) [concrete]
// CHECK:STDOUT: %DestroyImpl.impl_witness.bf8: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.b36) [concrete]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %ptr, (%DestroyImpl.impl_witness.bf8, %custom_witness.b80) [concrete]
// CHECK:STDOUT: %SelfDestruct.specific_fn: <specific function> = specific_function %SelfDestruct, @SelfDestruct(%Destroy.facet) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.Cycle: type = import_ref Main//a, Cycle, loaded [concrete = constants.%Cycle]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .DefaultOrUnformed = %Core.DefaultOrUnformed
// CHECK:STDOUT: .SelfDestruct = %Core.SelfDestruct
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8f0: <witness> = import_ref Main//a, loc6_1, loaded [concrete = constants.%complete_type.de4]
// CHECK:STDOUT: %Main.import_ref.3b0 = import_ref Main//a, inst{{[0-9A-F]+}} [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.ec9 = import_ref Main//a, loc5_8, unloaded
// CHECK:STDOUT: %Core.DefaultOrUnformed: type = import_ref Core//prelude/parts/default, DefaultOrUnformed, loaded [concrete = constants.%DefaultOrUnformed.type]
// CHECK:STDOUT: %Core.import_ref.002: @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op.type (%T.as.DefaultOrUnformed.impl.Op.type.5f6) = 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.5c0)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.856 = impl_witness_table (%Core.import_ref.002), @T.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: %Core.SelfDestruct: %SelfDestruct.type = import_ref Core//prelude/parts/destroy, SelfDestruct, loaded [concrete = constants.%SelfDestruct]
// CHECK:STDOUT: %Core.import_ref.74d: @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op.type (%T.as_type.as.DestroyImpl.impl.Op.type.dea) = import_ref Core//prelude/parts/destroy, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op (constants.%T.as_type.as.DestroyImpl.impl.Op.6e5)]
// CHECK:STDOUT: %DestroyImpl.impl_witness_table = impl_witness_table (%Core.import_ref.74d), @T.as_type.as.DestroyImpl.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Cycle = imports.%Main.Cycle
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Run = %Run.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %Run.decl: %Run.type = fn_decl @Run [concrete = constants.%Run] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Cycle [from "a.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f0
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.3b0
// CHECK:STDOUT: .a = imports.%Main.import_ref.ec9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Run() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %a.var: ref %ptr = var_storage %a.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%ptr, (constants.%DefaultOrUnformed.impl_witness.1b4) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc7_23.1: %DefaultOrUnformed.type = converted constants.%ptr, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc7_23.1 [concrete = constants.%ptr]
// CHECK:STDOUT: %.loc7_23.2: type = converted %.loc7_23.1, %as_type [concrete = constants.%ptr]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.DefaultOrUnformed.impl.Op.95c, @T.as.DefaultOrUnformed.impl.Op(constants.%ptr) [concrete = constants.%T.as.DefaultOrUnformed.impl.Op.specific_fn]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %ptr = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign %a.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %.loc7_22: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cycle.ref: type = name_ref Cycle, imports.%Main.Cycle [concrete = constants.%Cycle]
// CHECK:STDOUT: %ptr: type = ptr_type %Cycle.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: ref %ptr = wrapper_binding a, %a.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type.c3e = ref_binding_pattern a [concrete = constants.%a.patt]
// CHECK:STDOUT: %a.var_patt: %pattern_type.c3e = var_pattern %a.patt [concrete = constants.%a.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.facet.loc7_3.1: %Destroy.type = facet_value constants.%ptr, (constants.%DestroyImpl.impl_witness.bf8, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc7_3.1: %Destroy.type = converted constants.%ptr, %Destroy.facet.loc7_3.1 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %Destroy.facet.loc7_3.2: %Destroy.type = facet_value constants.%ptr, (constants.%DestroyImpl.impl_witness.bf8, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc7_3.2: %Destroy.type = converted constants.%ptr, %Destroy.facet.loc7_3.2 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %SelfDestruct.specific_fn: <specific function> = specific_function constants.%SelfDestruct, @SelfDestruct(constants.%Destroy.facet) [concrete = constants.%SelfDestruct.specific_fn]
// CHECK:STDOUT: %SelfDestruct.call: init %empty_tuple.type = call %SelfDestruct.specific_fn(%a.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc7(%self.param: ref %ptr) = "no_op";
// CHECK:STDOUT:
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