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carbon-lang/toolchain/lower/testdata/pointer/pointer_to_pointer.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/pointer_to_pointer.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/pointer/pointer_to_pointer.carbon
fn F(p: i32**) -> i32 {
var _: i32** = p;
var b: i32* = *p;
var c: i32** = &b;
return **c;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'pointer_to_pointer.carbon'
// CHECK:STDOUT: source_filename = "pointer_to_pointer.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define i32 @_CF.Main(ptr %p) #0 !dbg !26 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %_.var = alloca ptr, align 8, !dbg !31
// CHECK:STDOUT: %b.var = alloca ptr, align 8, !dbg !34
// CHECK:STDOUT: %c.var = alloca ptr, align 8, !dbg !38
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !31
// CHECK:STDOUT: store ptr %p, ptr %_.var, align 8, !dbg !31
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %b.var), !dbg !34
// CHECK:STDOUT: %.loc15_17.2 = load ptr, ptr %p, align 8, !dbg !36
// CHECK:STDOUT: store ptr %.loc15_17.2, ptr %b.var, align 8, !dbg !34
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %c.var), !dbg !38
// CHECK:STDOUT: store ptr %b.var, ptr %c.var, align 8, !dbg !38
// CHECK:STDOUT: %.loc17_12 = load ptr, ptr %c.var, align 8, !dbg !42
// CHECK:STDOUT: %.loc17_11.2 = load ptr, ptr %.loc17_12, align 8, !dbg !43
// CHECK:STDOUT: %.loc17_10.2 = load i32, ptr %.loc17_11.2, align 4, !dbg !44
// CHECK:STDOUT: call void @"_CSelfDestruct.c36b1dfc1a44331c:core.Destroy.Core"(ptr %c.var), !dbg !38
// CHECK:STDOUT: call void @"_CSelfDestruct.d088c7eb746488be:core.Destroy.Core"(ptr %b.var), !dbg !34
// CHECK:STDOUT: call void @"_CSelfDestruct.c36b1dfc1a44331c:core.Destroy.Core"(ptr %_.var), !dbg !31
// CHECK:STDOUT: ret i32 %.loc17_10.2, !dbg !45
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.c36b1dfc1a44331c:core.Destroy.Core"(ptr %self) #0 !dbg !47 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !49
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.d088c7eb746488be:core.Destroy.Core"(ptr %self) #0 !dbg !51 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !53
// 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: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_CSelfDestruct.c36b1dfc1a44331c:core.Destroy.Core", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 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: !18 = !DIFile(filename: "pointer_to_pointer.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 = !{null, !21}
// CHECK:STDOUT: !25 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main", scope: null, file: !18, line: 13, type: !23, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !46)
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !26, type: !21)
// CHECK:STDOUT: !31 = !DILocation(line: 14, column: 3, scope: !26)
// CHECK:STDOUT: !34 = !DILocation(line: 15, column: 3, scope: !26)
// CHECK:STDOUT: !36 = !DILocation(line: 15, column: 17, scope: !26)
// CHECK:STDOUT: !38 = !DILocation(line: 16, column: 3, scope: !26)
// CHECK:STDOUT: !42 = !DILocation(line: 17, column: 12, scope: !26)
// CHECK:STDOUT: !43 = !DILocation(line: 17, column: 11, scope: !26)
// CHECK:STDOUT: !44 = !DILocation(line: 17, column: 10, scope: !26)
// CHECK:STDOUT: !45 = !DILocation(line: 17, column: 3, scope: !26)
// CHECK:STDOUT: !46 = !{!27}
// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.c36b1dfc1a44331c:core.Destroy.Core", scope: null, file: !18, line: 16, type: !25, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !50)
// CHECK:STDOUT: !48 = !DILocalVariable(arg: 1, scope: !47, type: !21)
// CHECK:STDOUT: !49 = !DILocation(line: 16, column: 3, scope: !47)
// CHECK:STDOUT: !50 = !{!48}
// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.d088c7eb746488be:core.Destroy.Core", scope: null, file: !18, line: 15, type: !25, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !54)
// CHECK:STDOUT: !52 = !DILocalVariable(arg: 1, scope: !51, type: !21)
// CHECK:STDOUT: !53 = !DILocation(line: 15, column: 3, scope: !51)
// CHECK:STDOUT: !54 = !{!52}
// CHECK:STDOUT:
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