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carbon-lang/toolchain/lower/testdata/class/basic.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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/class/basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/class/basic.carbon
class C {
var a: i32;
var b: C*;
}
fn F(c: C) -> C;
fn Run() {
var c: C;
var _: C = F(c);
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'basic.carbon'
// CHECK:STDOUT: source_filename = "basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_CF.Main(ptr sret({ i32, ptr }), ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @main() #0 !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %c.var = alloca { i32, ptr }, align 8, !dbg !29
// CHECK:STDOUT: %_.var = alloca { i32, ptr }, align 8, !dbg !31
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !29
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !31
// CHECK:STDOUT: call void @_CF.Main(ptr %_.var, ptr %c.var), !dbg !33
// CHECK:STDOUT: call void @_CSelfDestruct.Core.356af3b6aef18564(ptr %_.var), !dbg !31
// CHECK:STDOUT: call void @_CSelfDestruct.Core.356af3b6aef18564(ptr %c.var), !dbg !29
// CHECK:STDOUT: ret i32 0, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.430a24cb589cd791:core.SubobjectDestroy.Core"(ptr %self) #0 !dbg !36 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc22_3.1.b = getelementptr inbounds nuw { i32, ptr }, ptr %self, i32 0, i32 1, !dbg !38
// CHECK:STDOUT: call void @_CSelfDestruct.Core.bc2719126434d85a(ptr %.loc22_3.1.b), !dbg !38
// CHECK:STDOUT: %.loc22_3.4.a = getelementptr inbounds nuw { i32, ptr }, ptr %self, i32 0, i32 0, !dbg !38
// CHECK:STDOUT: call void @_CSelfDestruct.Core.f127f30143696d51(ptr %.loc22_3.4.a), !dbg !38
// CHECK:STDOUT: ret void, !dbg !38
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.08d9e38b928ba575:core.SubobjectDestroy.Core"(ptr %self) #0 !dbg !42 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc22_3.1.b = getelementptr inbounds nuw { i32, ptr }, ptr %self, i32 0, i32 1, !dbg !44
// CHECK:STDOUT: call void @_CSelfDestruct.Core.bc2719126434d85a(ptr %.loc22_3.1.b), !dbg !44
// CHECK:STDOUT: %.loc22_3.4.a = getelementptr inbounds nuw { i32, ptr }, ptr %self, i32 0, i32 0, !dbg !44
// CHECK:STDOUT: call void @_CSelfDestruct.Core.f127f30143696d51(ptr %.loc22_3.4.a), !dbg !44
// CHECK:STDOUT: ret void, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CSelfDestruct.Core.356af3b6aef18564(ptr %t) #0 !dbg !46 {
// CHECK:STDOUT: call void @"_COp.08d9e38b928ba575:core.SubobjectDestroy.Core"(ptr %t), !dbg !50
// CHECK:STDOUT: ret void, !dbg !51
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CSelfDestruct.Core.bc2719126434d85a(ptr %t) #0 !dbg !53 {
// CHECK:STDOUT: ret void, !dbg !58
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CSelfDestruct.Core.f127f30143696d51(ptr %t) #0 !dbg !60 {
// CHECK:STDOUT: ret void, !dbg !65
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CSelfDestruct.Core.356af3b6aef18564, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CSelfDestruct.Core.bc2719126434d85a, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_CSelfDestruct.Core.f127f30143696d51, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!19}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !10 = !DIFile(filename: "min_prelude/parts/destroy.carbon", directory: "")
// CHECK:STDOUT: !18 = !DIFile(filename: "basic.carbon", directory: "")
// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !24 = !{!20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !21}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !18, line: 20, type: !25, spFlags: DISPFlagDefinition, unit: !19)
// CHECK:STDOUT: !29 = !DILocation(line: 21, column: 3, scope: !28)
// CHECK:STDOUT: !31 = !DILocation(line: 22, column: 3, scope: !28)
// CHECK:STDOUT: !33 = !DILocation(line: 22, column: 14, scope: !28)
// CHECK:STDOUT: !35 = !DILocation(line: 20, column: 1, scope: !28)
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Op", linkageName: "_COp.430a24cb589cd791:core.SubobjectDestroy.Core", scope: null, file: !18, line: 22, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !41)
// CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !36, type: !21)
// CHECK:STDOUT: !38 = !DILocation(line: 22, column: 3, scope: !36)
// CHECK:STDOUT: !39 = !{null, !20}
// CHECK:STDOUT: !40 = !DISubroutineType(types: !39)
// CHECK:STDOUT: !41 = !{!37}
// CHECK:STDOUT: !42 = distinct !DISubprogram(name: "Op", linkageName: "_COp.08d9e38b928ba575:core.SubobjectDestroy.Core", scope: null, file: !18, line: 22, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !45)
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !42, type: !21)
// CHECK:STDOUT: !44 = !DILocation(line: 22, column: 3, scope: !42)
// CHECK:STDOUT: !45 = !{!43}
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.356af3b6aef18564", scope: null, file: !10, line: 32, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !52)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !46, type: !21)
// CHECK:STDOUT: !50 = !DILocation(line: 34, column: 5, scope: !46)
// CHECK:STDOUT: !51 = !DILocation(line: 32, column: 1, scope: !46)
// CHECK:STDOUT: !52 = !{!47}
// CHECK:STDOUT: !53 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.bc2719126434d85a", scope: null, file: !10, line: 32, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !59)
// CHECK:STDOUT: !54 = !DILocalVariable(arg: 1, scope: !53, type: !21)
// CHECK:STDOUT: !58 = !DILocation(line: 32, column: 1, scope: !53)
// CHECK:STDOUT: !59 = !{!54}
// CHECK:STDOUT: !60 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.f127f30143696d51", scope: null, file: !10, line: 32, type: !40, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !66)
// CHECK:STDOUT: !61 = !DILocalVariable(arg: 1, scope: !60, type: !20)
// CHECK:STDOUT: !65 = !DILocation(line: 32, column: 1, scope: !60)
// CHECK:STDOUT: !66 = !{!61}
// CHECK:STDOUT:
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