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carbon-lang/toolchain/lower/testdata/pointer/basic.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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/pointer/basic.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/pointer/basic.carbon
fn G(p: i32*) -> i32 {
return *p;
}
fn F() -> i32 {
var n: i32 = 0;
return G(&n);
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'basic.carbon'
// CHECK:STDOUT: source_filename = "basic.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CG.Main(ptr %p) #0 !dbg !28 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc14_10.2 = load i32, ptr %p, align 4, !dbg !34
// CHECK:STDOUT: ret i32 %.loc14_10.2, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CF.Main() #0 !dbg !37 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.var = alloca i32, align 4, !dbg !40
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !40
// CHECK:STDOUT: store i32 0, ptr %n.var, align 4, !dbg !40
// CHECK:STDOUT: %G.call = call i32 @_CG.Main(ptr %n.var), !dbg !44
// CHECK:STDOUT: call void @"_CSelfDestruct.f58524831c37807e:core.Destroy.Core"(ptr %n.var), !dbg !40
// CHECK:STDOUT: ret i32 %G.call, !dbg !45
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.6dae29ece9a708c4:core.Destroy.Core"(ptr %self) #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !48
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSubobjectDestroy.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !50 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !52
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.f58524831c37807e:core.Destroy.Core"(ptr %self) #0 !dbg !54 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CSubobjectDestroy.f58524831c37807e:core.Destroy.Core"(ptr %self), !dbg !56
// CHECK:STDOUT: ret void, !dbg !56
// 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: 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: "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: !22 = !{!20, !21}
// CHECK:STDOUT: !23 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !24 = !{!20}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = !{null, !20}
// CHECK:STDOUT: !27 = !DISubroutineType(types: !26)
// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !18, line: 13, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !36)
// CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !28, type: !21)
// CHECK:STDOUT: !34 = !DILocation(line: 14, column: 10, scope: !28)
// CHECK:STDOUT: !35 = !DILocation(line: 14, column: 3, scope: !28)
// CHECK:STDOUT: !36 = !{!29}
// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !18, line: 17, type: !25, spFlags: DISPFlagDefinition, unit: !19)
// CHECK:STDOUT: !40 = !DILocation(line: 18, column: 3, scope: !37)
// CHECK:STDOUT: !44 = !DILocation(line: 19, column: 10, scope: !37)
// CHECK:STDOUT: !45 = !DILocation(line: 19, column: 3, scope: !37)
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.6dae29ece9a708c4:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !49)
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !46, type: !20)
// CHECK:STDOUT: !48 = !DILocation(line: 18, column: 3, scope: !46)
// CHECK:STDOUT: !49 = !{!47}
// CHECK:STDOUT: !50 = distinct !DISubprogram(name: "SubobjectDestroy", linkageName: "_CSubobjectDestroy.f58524831c37807e:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !53)
// CHECK:STDOUT: !51 = !DILocalVariable(arg: 1, scope: !50, type: !20)
// CHECK:STDOUT: !52 = !DILocation(line: 18, column: 3, scope: !50)
// CHECK:STDOUT: !53 = !{!51}
// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.f58524831c37807e:core.Destroy.Core", scope: null, file: !18, line: 18, type: !27, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !57)
// CHECK:STDOUT: !55 = !DILocalVariable(arg: 1, scope: !54, type: !20)
// CHECK:STDOUT: !56 = !DILocation(line: 18, column: 3, scope: !54)
// CHECK:STDOUT: !57 = !{!55}
// CHECK:STDOUT:
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