mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 21:28:10 +00:00
Christopher Di Bella
05a7ecbd34
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`.
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 !18 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: ret void, !dbg !22
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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 !23 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %_.var = alloca {}, align 1, !dbg !24
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !24
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// CHECK:STDOUT: call void @_CEcho.Main(), !dbg !25
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// CHECK:STDOUT: call void @_CSelfDestruct.Core.61b5bb2079973306(ptr %_.var), !dbg !24
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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: 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: ; Function Attrs: nounwind
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// CHECK:STDOUT: define linkonce_odr void @_CSelfDestruct.Core.61b5bb2079973306(ptr %t) #0 !dbg !31 {
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// CHECK:STDOUT: ret void, !dbg !36
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// CHECK:STDOUT: }
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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: !6 = !DIFile(filename: "min_prelude/parts/destroy.carbon", directory: "")
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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 = 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: !22 = !DILocation(line: 14, column: 3, scope: !18)
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// CHECK:STDOUT: !23 = 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: !24 = !DILocation(line: 18, column: 3, scope: !23)
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// CHECK:STDOUT: !25 = !DILocation(line: 18, column: 15, scope: !23)
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// CHECK:STDOUT: !27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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// CHECK:STDOUT: !28 = !{null, !27}
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// CHECK:STDOUT: !29 = !DISubroutineType(types: !28)
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// CHECK:STDOUT: !30 = !DILocation(line: 17, column: 1, scope: !23)
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// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.61b5bb2079973306", scope: null, file: !6, line: 32, type: !29, spFlags: DISPFlagDefinition, unit: !15, retainedNodes: !37)
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// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !31, type: !27)
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// CHECK:STDOUT: !36 = !DILocation(line: 32, column: 1, scope: !31)
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// CHECK:STDOUT: !37 = !{!32}
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// CHECK:STDOUT:
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