mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 10:38:29 +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`.
73 lines
3.8 KiB
Plaintext
73 lines
3.8 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/int.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/struct/empty.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/struct/empty.carbon
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fn Run() -> i32 {
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var x: {} = {};
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var _: {} = x;
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return 0;
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}
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// CHECK:STDOUT: ; ---
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// CHECK:STDOUT: ; ModuleID = 'empty.carbon'
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// CHECK:STDOUT: source_filename = "empty.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nounwind
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// CHECK:STDOUT: define i32 @main() #0 !dbg !23 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %x.var = alloca {}, align 1, !dbg !26
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// CHECK:STDOUT: %_.var = alloca {}, align 1, !dbg !28
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %x.var), !dbg !26
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %_.var), !dbg !28
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// CHECK:STDOUT: call void @_CSelfDestruct.Core.61b5bb2079973306(ptr %_.var), !dbg !28
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// CHECK:STDOUT: call void @_CSelfDestruct.Core.61b5bb2079973306(ptr %x.var), !dbg !26
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// CHECK:STDOUT: ret i32 0, !dbg !34
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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 !35 {
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// CHECK:STDOUT: ret void, !dbg !40
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
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// CHECK:STDOUT: uselistorder ptr @_CSelfDestruct.Core.61b5bb2079973306, { 1, 0 }
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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 = !{!19}
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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: !10 = !DIFile(filename: "min_prelude/parts/destroy.carbon", directory: "")
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// CHECK:STDOUT: !18 = !DIFile(filename: "empty.carbon", directory: "")
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// CHECK:STDOUT: !19 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !18, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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// CHECK:STDOUT: !21 = !{!20}
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// CHECK:STDOUT: !22 = !DISubroutineType(types: !21)
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// CHECK:STDOUT: !23 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !18, line: 13, type: !22, spFlags: DISPFlagDefinition, unit: !19)
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// CHECK:STDOUT: !26 = !DILocation(line: 14, column: 3, scope: !23)
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// CHECK:STDOUT: !28 = !DILocation(line: 15, column: 3, scope: !23)
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// CHECK:STDOUT: !31 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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// CHECK:STDOUT: !32 = !{null, !31}
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// CHECK:STDOUT: !33 = !DISubroutineType(types: !32)
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// CHECK:STDOUT: !34 = !DILocation(line: 16, column: 3, scope: !23)
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// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "SelfDestruct", linkageName: "_CSelfDestruct.Core.61b5bb2079973306", scope: null, file: !10, line: 32, type: !33, spFlags: DISPFlagDefinition, unit: !19, retainedNodes: !41)
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// CHECK:STDOUT: !36 = !DILocalVariable(arg: 1, scope: !35, type: !31)
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// CHECK:STDOUT: !40 = !DILocation(line: 32, column: 1, scope: !35)
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// CHECK:STDOUT: !41 = !{!36}
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// CHECK:STDOUT:
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