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carbon-lang/toolchain/lower/testdata/let/copy_value_rep.carbon
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Christopher Di BellaandRichard Smith b2d339b581 Enable SubobjectDestroy.Op to destroy fields defined in a ClassType (#7840) 
Base classes will be destroyed in a dedicated change, so we can
trivially confirm that the base is being destroyed.

This is a partial implementation of #7362.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-10-01 21:37:17 +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/let/copy_value_rep.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/let/copy_value_rep.carbon
class X {
var a: i32;
}
fn Run() -> i32 {
var x: X = {.a = 1};
let n: i32 = x.a;
x.a = 2;
// Should return 1, not 2.
return n;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'copy_value_rep.carbon'
// CHECK:STDOUT: source_filename = "copy_value_rep.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @X.val.loc18_3 = internal constant { i32 } { i32 1 }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @main() #0 !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %x.var = alloca { i32 }, align 4, !dbg !31
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %x.var), !dbg !31
// CHECK:STDOUT: %.loc18_21.3.a = getelementptr inbounds nuw { i32 }, ptr %x.var, i32 0, i32 0, !dbg !32
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %x.var, ptr align 4 @X.val.loc18_3, i64 4, i1 false), !dbg !31
// CHECK:STDOUT: %.loc19_17.1.a = getelementptr inbounds nuw { i32 }, ptr %x.var, i32 0, i32 0, !dbg !34
// CHECK:STDOUT: %.loc19_17.2 = load i32, ptr %.loc19_17.1.a, align 4, !dbg !34
// CHECK:STDOUT: %.loc20_4.a = getelementptr inbounds nuw { i32 }, ptr %x.var, i32 0, i32 0, !dbg !37
// CHECK:STDOUT: store i32 2, ptr %.loc20_4.a, align 4, !dbg !37
// CHECK:STDOUT: call void @"_CSelfDestruct.8b0bf151036f045a:core.Destroy.Core"(ptr %x.var), !dbg !31
// CHECK:STDOUT: ret i32 %.loc19_17.2, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !40 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !42
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSubobjectDestroy.a9280e8bea6fc5f9:core.Destroy.Core"(ptr %self) #0 !dbg !44 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc18.a = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !46
// CHECK:STDOUT: call void @"_CSelfDestruct.f58524831c37807e:core.Destroy.Core"(ptr %.loc18.a), !dbg !46
// CHECK:STDOUT: ret void, !dbg !46
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.a9280e8bea6fc5f9:core.Destroy.Core"(ptr %self) #0 !dbg !48 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CSubobjectDestroy.a9280e8bea6fc5f9:core.Destroy.Core"(ptr %self), !dbg !50
// CHECK:STDOUT: ret void, !dbg !50
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSubobjectDestroy.8b0bf151036f045a:core.Destroy.Core"(ptr %self) #0 !dbg !52 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc18.a = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !54
// CHECK:STDOUT: call void @"_CSelfDestruct.f58524831c37807e:core.Destroy.Core"(ptr %.loc18.a), !dbg !54
// CHECK:STDOUT: ret void, !dbg !54
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.8b0bf151036f045a:core.Destroy.Core"(ptr %self) #0 !dbg !56 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CSubobjectDestroy.8b0bf151036f045a:core.Destroy.Core"(ptr %self), !dbg !58
// CHECK:STDOUT: ret void, !dbg !58
// 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// 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: !18 = !DIFile(filename: "copy_value_rep.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 = !{!20}
// CHECK:STDOUT: !22 = !DISubroutineType(types: !21)
// CHECK:STDOUT: !23 = !{null, !20}
// CHECK:STDOUT: !24 = !DISubroutineType(types: !23)
// CHECK:STDOUT: !25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !26 = !{null, !25}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !18, line: 17, type: !22, spFlags: DISPFlagDefinition, unit: !19)
// CHECK:STDOUT: !31 = !DILocation(line: 18, column: 3, scope: !28)
// CHECK:STDOUT: !32 = !DILocation(line: 18, column: 14, scope: !28)
// CHECK:STDOUT: !34 = !DILocation(line: 19, column: 16, scope: !28)
// CHECK:STDOUT: !37 = !DILocation(line: 20, column: 3, scope: !28)
// CHECK:STDOUT: !39 = !DILocation(line: 22, column: 3, scope: !28)
// CHECK:STDOUT: !40 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.f58524831c37807e:core.Destroy.Core", scope: null, file: !18, line: 18, type: !24, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !43)
// CHECK:STDOUT: !41 = !DILocalVariable(arg: 1, scope: !40, type: !20)
// CHECK:STDOUT: !42 = !DILocation(line: 18, column: 3, scope: !40)
// CHECK:STDOUT: !43 = !{!41}
// CHECK:STDOUT: !44 = distinct !DISubprogram(name: "SubobjectDestroy", linkageName: "_CSubobjectDestroy.a9280e8bea6fc5f9:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !47)
// CHECK:STDOUT: !45 = !DILocalVariable(arg: 1, scope: !44, type: !25)
// CHECK:STDOUT: !46 = !DILocation(line: 18, column: 3, scope: !44)
// CHECK:STDOUT: !47 = !{!45}
// CHECK:STDOUT: !48 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.a9280e8bea6fc5f9:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !51)
// CHECK:STDOUT: !49 = !DILocalVariable(arg: 1, scope: !48, type: !25)
// CHECK:STDOUT: !50 = !DILocation(line: 18, column: 3, scope: !48)
// CHECK:STDOUT: !51 = !{!49}
// CHECK:STDOUT: !52 = distinct !DISubprogram(name: "SubobjectDestroy", linkageName: "_CSubobjectDestroy.8b0bf151036f045a:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !55)
// CHECK:STDOUT: !53 = !DILocalVariable(arg: 1, scope: !52, type: !25)
// CHECK:STDOUT: !54 = !DILocation(line: 18, column: 3, scope: !52)
// CHECK:STDOUT: !55 = !{!53}
// CHECK:STDOUT: !56 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.8b0bf151036f045a:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !59)
// CHECK:STDOUT: !57 = !DILocalVariable(arg: 1, scope: !56, type: !25)
// CHECK:STDOUT: !58 = !DILocation(line: 18, column: 3, scope: !56)
// CHECK:STDOUT: !59 = !{!57}
// CHECK:STDOUT:
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