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carbon-lang/toolchain/check/testdata/class/method/static_method.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/int.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/method/static_method.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/method/static_method.carbon
class Class {
fn F() -> i32;
}
fn Run() -> i32 {
var c: Class;
return c.F();
}
// CHECK:STDOUT: --- static_method.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Class: type = class_type @Class [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = parameterized_class_name_type @Int [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %.0b3: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %pattern_type.d94: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.299: %pattern_type.d94 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.6fa: %pattern_type.d94 = return_slot_pattern %return.param_patt.299, %i32 [concrete]
// CHECK:STDOUT: %Class.F.type: type = fn_type @Class.F [concrete]
// CHECK:STDOUT: %Class.F: %Class.F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %Run.type: type = fn_type @Run [concrete]
// CHECK:STDOUT: %Run: %Run.type = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type.f15: type = pattern_type %Class [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.f15 = ref_binding_pattern c [concrete]
// CHECK:STDOUT: %c.var_patt: %pattern_type.f15 = var_pattern %c.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.0e1: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.856, @T.as.DefaultOrUnformed.impl(%Class) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.1a9: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%Class) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.c3e: %T.as.DefaultOrUnformed.impl.Op.type.1a9 = struct_value () [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %Class, (%DefaultOrUnformed.impl_witness.0e1) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function %T.as.DefaultOrUnformed.impl.Op.c3e, @T.as.DefaultOrUnformed.impl.Op(%Class) [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.6870fd.2: type = fn_type @SubobjectDestroy.WithSelf.Op.loc20_3.2 [concrete]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.30f1ee.2: %SubobjectDestroy.WithSelf.Op.type.6870fd.2 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b80ef6.2: <witness> = custom_witness (%SubobjectDestroy.WithSelf.Op.30f1ee.2), @SubobjectDestroy [concrete]
// CHECK:STDOUT: %SubobjectDestroy.facet.3a1: %SubobjectDestroy.type = facet_value %Class, (%custom_witness.b80ef6.2) [concrete]
// CHECK:STDOUT: %DestroyImpl.impl_witness.66c: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.3a1) [concrete]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %Class, (%DestroyImpl.impl_witness.66c, %custom_witness.b80ef6.2) [concrete]
// CHECK:STDOUT: %SelfDestruct.specific_fn: <specific function> = specific_function %SelfDestruct, @SelfDestruct(%Destroy.facet) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .DefaultOrUnformed = %Core.DefaultOrUnformed
// CHECK:STDOUT: .SelfDestruct = %Core.SelfDestruct
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// 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: .Core = imports.%Core
// CHECK:STDOUT: .Class = %Class.decl
// CHECK:STDOUT: .Run = %Run.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Class.decl: type = class_decl @Class [concrete = constants.%Class] {} {}
// CHECK:STDOUT: %Run.decl: %Run.type = fn_decl @Run [concrete = constants.%Run] {
// CHECK:STDOUT: %return.param_patt: %pattern_type.d94 = out_param_pattern [concrete = constants.%return.param_patt.299]
// CHECK:STDOUT: %return.patt: %pattern_type.d94 = return_slot_pattern %return.param_patt, %i32 [concrete = constants.%return.patt.6fa]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc19: Core.Form = init_form %i32 [concrete = constants.%.0b3]
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param0
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Class {
// CHECK:STDOUT: %Class.F.decl: %Class.F.type = fn_decl @Class.F [concrete = constants.%Class.F] {
// CHECK:STDOUT: %return.param_patt: %pattern_type.d94 = out_param_pattern [concrete = constants.%return.param_patt.299]
// CHECK:STDOUT: %return.patt: %pattern_type.d94 = return_slot_pattern %return.param_patt, %i32 [concrete = constants.%return.patt.6fa]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc16: Core.Form = init_form %i32 [concrete = constants.%.0b3]
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param0
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Class
// CHECK:STDOUT: .F = %Class.F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Class.F() -> out %return.param: %i32;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Run() -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.var: ref %Class = var_storage %c.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%Class, (constants.%DefaultOrUnformed.impl_witness.0e1) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc20_15.1: %DefaultOrUnformed.type = converted constants.%Class, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc20_15.1 [concrete = constants.%Class]
// CHECK:STDOUT: %.loc20_15.2: type = converted %.loc20_15.1, %as_type [concrete = constants.%Class]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.DefaultOrUnformed.impl.Op.c3e, @T.as.DefaultOrUnformed.impl.Op(constants.%Class) [concrete = constants.%T.as.DefaultOrUnformed.impl.Op.specific_fn]
// CHECK:STDOUT: %.loc20_3.1: ref %Class = splice_block %c.var {}
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %Class to %.loc20_3.1 = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign %c.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %Class.ref: type = name_ref Class, file.%Class.decl [concrete = constants.%Class]
// CHECK:STDOUT: %c: ref %Class = wrapper_binding c, %c.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.f15 = ref_binding_pattern c [concrete = constants.%c.patt]
// CHECK:STDOUT: %c.var_patt: %pattern_type.f15 = var_pattern %c.patt [concrete = constants.%c.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.ref: ref %Class = name_ref c, %c
// CHECK:STDOUT: %F.ref: %Class.F.type = name_ref F, @Class.%Class.F.decl [concrete = constants.%Class.F]
// CHECK:STDOUT: %Class.F.call: init %i32 = call %F.ref()
// CHECK:STDOUT: %Destroy.facet.loc20_3.1: %Destroy.type = facet_value constants.%Class, (constants.%DestroyImpl.impl_witness.66c, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc20_3.2: %Destroy.type = converted constants.%Class, %Destroy.facet.loc20_3.1 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %Destroy.facet.loc20_3.2: %Destroy.type = facet_value constants.%Class, (constants.%DestroyImpl.impl_witness.66c, constants.%custom_witness.b80ef6.2) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc20_3.3: %Destroy.type = converted constants.%Class, %Destroy.facet.loc20_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(%c.var)
// CHECK:STDOUT: return %Class.F.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc20_3.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc20_3.2(%self.param: ref %Class) = "no_op";
// CHECK:STDOUT:
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