mirror of
https://github.com/carbon-language/carbon-lang.git
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Christopher Di Bella
f7cd39428e
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
76 lines
3.9 KiB
Plaintext
76 lines
3.9 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/call/empty_struct.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/call/empty_struct.carbon
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fn Echo(_: {}) -> {} {
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return {};
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}
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fn Main() {
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var _: {} = Echo({});
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}
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// CHECK:STDOUT: ; ---
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// CHECK:STDOUT: ; ModuleID = 'empty_struct.carbon'
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// CHECK:STDOUT: source_filename = "empty_struct.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define void @_CEcho.Main() #0 !dbg !21 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void, !dbg !25
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define void @_CMain.Main() #0 !dbg !26 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %_.var = alloca {}, align 1, !dbg !27
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !27
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// CHECK:STDOUT: call void @_CEcho.Main(), !dbg !28
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// CHECK:STDOUT: call void @"_CSelfDestruct.cb8adced19392b99:core.Destroy.Core"(ptr %_.var), !dbg !27
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// CHECK:STDOUT: ret void, !dbg !30
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define weak_odr void @"_CSelfDestruct.cb8adced19392b99:core.Destroy.Core"(ptr %self) #0 !dbg !31 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void, !dbg !33
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nounwind }
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// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.dbg.cu = !{!15}
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// CHECK:STDOUT: !llvm.module.flags = !{!2, !3}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !14 = !DIFile(filename: "empty_struct.carbon", directory: "")
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// CHECK:STDOUT: !15 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !14, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !16 = !{null}
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// CHECK:STDOUT: !17 = !DISubroutineType(types: !16)
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// CHECK:STDOUT: !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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// CHECK:STDOUT: !19 = !{null, !18}
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// CHECK:STDOUT: !20 = !DISubroutineType(types: !19)
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// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "Echo", linkageName: "_CEcho.Main", scope: null, file: !14, line: 13, type: !17, spFlags: DISPFlagDefinition, unit: !15)
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// CHECK:STDOUT: !25 = !DILocation(line: 14, column: 3, scope: !21)
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// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "Main", linkageName: "_CMain.Main", scope: null, file: !14, line: 17, type: !17, spFlags: DISPFlagDefinition, unit: !15)
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// CHECK:STDOUT: !27 = !DILocation(line: 18, column: 3, scope: !26)
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// CHECK:STDOUT: !28 = !DILocation(line: 18, column: 15, scope: !26)
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// CHECK:STDOUT: !30 = !DILocation(line: 17, column: 1, scope: !26)
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// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.cb8adced19392b99:core.Destroy.Core", scope: null, file: !14, line: 18, type: !20, spFlags: DISPFlagDefinition, unit: !15, retainedNodes: !34)
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// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !31, type: !18)
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// CHECK:STDOUT: !33 = !DILocation(line: 18, column: 3, scope: !31)
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// CHECK:STDOUT: !34 = !{!32}
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// CHECK:STDOUT:
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