Export Carbon classes as base / final / abstract. (#7191)

* For Carbon `base class C`, export as a regular C++ class.
* For Carbon `class C`, export with the C++ `final` keyword attribute.
* For Carbon `abstract C`, mark the destructor as pure virtual in cases
where no member function is abstract, or emit an error if the destructor
is not virtual.

To support the final point, mark the destructor of an exported class as
virtual if it overrides a virtual destructor from the base class.

In passing, fix a crash exporting fields if the class has an invalid
base type.
This commit is contained in:
Richard Smith
2026-05-13 17:48:55 +00:00
committed by GitHub
parent c33fb9fc48
commit 917856aff7
9 changed files with 594 additions and 83 deletions
@@ -0,0 +1,338 @@
// 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
// EXTRA-ARGS: --clang-arg=-fno-exceptions
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/class/virtual_fn.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/class/virtual_fn.carbon
// --- override_virtual_dtor.carbon
library "[[@TEST_NAME]]";
import Cpp;
inline Cpp '''
struct A {
virtual ~A() = 0;
};
''';
class Final {
extend base: Cpp.A;
}
base class Base {
extend base: Cpp.A;
}
inline Cpp '''
void delete_new_Final() {
// vtable should refer to Carbon::Final's dtor.
auto* p = new Carbon::Final;
// Perform a devirtualized call to Final destructor.
delete p;
}
void delete_new_Base() {
// vtable should refer to Carbon::Base's dtor.
auto* p = new Carbon::Base;
// Perform a virtual call to destructor.
delete p;
}
''';
// CHECK:STDOUT: ; ModuleID = 'override_virtual_dtor.carbon'
// CHECK:STDOUT: source_filename = "override_virtual_dtor.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon5FinalC2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon5FinalD2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon4BaseC2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN1AC2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon5FinalD0Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon4BaseD2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN6Carbon4BaseD0Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTVN6Carbon5FinalE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTIN6Carbon5FinalE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTSN6Carbon5FinalE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTI1A = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTS1A = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTV1A = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTVN6Carbon4BaseE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTIN6Carbon4BaseE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZTSN6Carbon4BaseE = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: @"_CFinal.Main.$vtable" = unnamed_addr constant [0 x i32] zeroinitializer
// CHECK:STDOUT: @"_CBase.Main.$vtable" = unnamed_addr constant [0 x i32] zeroinitializer
// CHECK:STDOUT: @_ZTVN6Carbon5FinalE = linkonce_odr dso_local unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr @_ZTIN6Carbon5FinalE, ptr @_ZN6Carbon5FinalD2Ev, ptr @_ZN6Carbon5FinalD0Ev] }, comdat, align 8
// CHECK:STDOUT: @_ZTIN6Carbon5FinalE = linkonce_odr dso_local constant { ptr, ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv120__si_class_type_infoE, i64 2), ptr @_ZTSN6Carbon5FinalE, ptr @_ZTI1A }, comdat, align 8
// CHECK:STDOUT: @_ZTVN10__cxxabiv120__si_class_type_infoE = external global [0 x ptr]
// CHECK:STDOUT: @_ZTSN6Carbon5FinalE = linkonce_odr dso_local constant [16 x i8] c"N6Carbon5FinalE\00", comdat, align 1
// CHECK:STDOUT: @_ZTI1A = linkonce_odr dso_local constant { ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv117__class_type_infoE, i64 2), ptr @_ZTS1A }, comdat, align 8
// CHECK:STDOUT: @_ZTVN10__cxxabiv117__class_type_infoE = external global [0 x ptr]
// CHECK:STDOUT: @_ZTS1A = linkonce_odr dso_local constant [3 x i8] c"1A\00", comdat, align 1
// CHECK:STDOUT: @_ZTV1A = linkonce_odr dso_local unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr @_ZTI1A, ptr @__cxa_pure_virtual, ptr @__cxa_pure_virtual] }, comdat, align 8
// CHECK:STDOUT: @_ZTVN6Carbon4BaseE = linkonce_odr dso_local unnamed_addr constant { [4 x ptr] } { [4 x ptr] [ptr null, ptr @_ZTIN6Carbon4BaseE, ptr @_ZN6Carbon4BaseD2Ev, ptr @_ZN6Carbon4BaseD0Ev] }, comdat, align 8
// CHECK:STDOUT: @_ZTIN6Carbon4BaseE = linkonce_odr dso_local constant { ptr, ptr, ptr } { ptr getelementptr inbounds (ptr, ptr @_ZTVN10__cxxabiv120__si_class_type_infoE, i64 2), ptr @_ZTSN6Carbon4BaseE, ptr @_ZTI1A }, comdat, align 8
// CHECK:STDOUT: @_ZTSN6Carbon4BaseE = linkonce_odr dso_local constant [15 x i8] c"N6Carbon4BaseE\00", comdat, align 1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define dso_local void @_Z16delete_new_Finalv() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %p = alloca ptr, align 8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %p) #7
// CHECK:STDOUT: %call = call noalias noundef nonnull ptr @_Znwm(i64 noundef 8) #8
// CHECK:STDOUT: call void @_ZN6Carbon5FinalC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %call) #7
// CHECK:STDOUT: store ptr %call, ptr %p, align 8, !tbaa !11
// CHECK:STDOUT: %0 = load ptr, ptr %p, align 8, !tbaa !11
// CHECK:STDOUT: %isnull = icmp eq ptr %0, null
// CHECK:STDOUT: br i1 %isnull, label %delete.end, label %delete.notnull
// CHECK:STDOUT:
// CHECK:STDOUT: delete.notnull: ; preds = %entry
// CHECK:STDOUT: call void @_ZN6Carbon5FinalD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %0) #7
// CHECK:STDOUT: call void @_ZdlPvm(ptr noundef %0, i64 noundef 8) #9
// CHECK:STDOUT: br label %delete.end
// CHECK:STDOUT:
// CHECK:STDOUT: delete.end: ; preds = %delete.notnull, %entry
// CHECK:STDOUT: call void @llvm.lifetime.end.p0(ptr %p) #7
// CHECK:STDOUT: ret void
// 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: ; Function Attrs: nobuiltin allocsize(0)
// CHECK:STDOUT: declare noundef nonnull ptr @_Znwm(i64 noundef) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon5FinalC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !11
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_ZN1AC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %this1) #7
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTVN6Carbon5FinalE, i32 0, i32 0, i32 2), ptr %this1, align 8, !tbaa !14
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon5FinalD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !11
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @"_C__destroy_thunk:thunk.Final.Main"(ptr noundef nonnull align 8 dereferenceable(8) %this1)
// CHECK:STDOUT: call void @_ZN1AD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this1) #7
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nobuiltin nounwind
// CHECK:STDOUT: declare void @_ZdlPvm(ptr noundef, i64 noundef) #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.end.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define dso_local void @_Z15delete_new_Basev() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %p = alloca ptr, align 8
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %p) #7
// CHECK:STDOUT: %call = call noalias noundef nonnull ptr @_Znwm(i64 noundef 8) #8
// CHECK:STDOUT: call void @_ZN6Carbon4BaseC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %call) #7
// CHECK:STDOUT: store ptr %call, ptr %p, align 8, !tbaa !16
// CHECK:STDOUT: %0 = load ptr, ptr %p, align 8, !tbaa !16
// CHECK:STDOUT: %isnull = icmp eq ptr %0, null
// CHECK:STDOUT: br i1 %isnull, label %delete.end, label %delete.notnull
// CHECK:STDOUT:
// CHECK:STDOUT: delete.notnull: ; preds = %entry
// CHECK:STDOUT: %vtable = load ptr, ptr %0, align 8, !tbaa !14
// CHECK:STDOUT: %vfn = getelementptr inbounds ptr, ptr %vtable, i64 1
// CHECK:STDOUT: %1 = load ptr, ptr %vfn, align 8
// CHECK:STDOUT: call void %1(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %0) #7
// CHECK:STDOUT: br label %delete.end
// CHECK:STDOUT:
// CHECK:STDOUT: delete.end: ; preds = %delete.notnull, %entry
// CHECK:STDOUT: call void @llvm.lifetime.end.p0(ptr %p) #7
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon4BaseC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !16
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_ZN1AC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %this1) #7
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTVN6Carbon4BaseE, i32 0, i32 0, i32 2), ptr %this1, align 8, !tbaa !14
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_C__destroy_thunk:thunk.Final.Main"(ptr %self) #5 !dbg !18 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_COp.4472d163614a5082:core.Destroy.Core"(ptr %self), !dbg !24
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: declare void @_ZN1AD1Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8)) unnamed_addr #6
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.446491dd079aaad2:core.Destroy.Core"(ptr %self) #7 !dbg !25 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.4472d163614a5082:core.Destroy.Core"(ptr %self) #7 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !32
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_C__destroy_thunk:thunk.Base.Main"(ptr %self) #5 !dbg !33 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_COp.96a711151205ee34:core.Destroy.Core"(ptr %self), !dbg !36
// CHECK:STDOUT: ret void, !dbg !36
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.96a711151205ee34:core.Destroy.Core"(ptr %self) #7 !dbg !37 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN1AC2Ev(ptr noundef nonnull align 8 dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !41
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTV1A, i32 0, i32 0, i32 2), ptr %this1, align 8, !tbaa !14
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon5FinalD0Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !11
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_ZN6Carbon5FinalD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this1) #7
// CHECK:STDOUT: call void @_ZdlPvm(ptr noundef %this1, i64 noundef 8) #9
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @__cxa_pure_virtual() unnamed_addr
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: declare void @_ZN1AD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8)) unnamed_addr #6
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon4BaseD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !16
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: store ptr getelementptr inbounds inrange(-16, 16) ({ [4 x ptr] }, ptr @_ZTVN6Carbon4BaseE, i32 0, i32 0, i32 2), ptr %this1, align 8, !tbaa !14
// CHECK:STDOUT: call void @"_C__destroy_thunk:thunk.Base.Main"(ptr noundef nonnull align 8 dereferenceable(8) %this1)
// CHECK:STDOUT: call void @_ZN1AD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this1) #7
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: inlinehint mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN6Carbon4BaseD0Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !16
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: call void @_ZN6Carbon4BaseD2Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %this1) #7
// CHECK:STDOUT: call void @_ZdlPvm(ptr noundef %this1, i64 noundef 8) #9
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @_ZN6Carbon5FinalD2Ev, { 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZN1AC2Ev, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @__cxa_pure_virtual, { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @_ZN6Carbon4BaseD2Ev, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { nobuiltin allocsize(0) "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #3 = { inlinehint mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #4 = { nobuiltin nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #5 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #6 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #7 = { nounwind }
// CHECK:STDOUT: attributes #8 = { builtin allocsize(0) }
// CHECK:STDOUT: attributes #9 = { builtin nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "override_virtual_dtor.carbon", directory: "")
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = !{!12, !12, i64 0}
// CHECK:STDOUT: !12 = !{!"p1 _ZTSN6Carbon5FinalE", !13, i64 0}
// CHECK:STDOUT: !13 = !{!"any pointer", !9, i64 0}
// CHECK:STDOUT: !14 = !{!15, !15, i64 0}
// CHECK:STDOUT: !15 = !{!"vtable pointer", !10, i64 0}
// CHECK:STDOUT: !16 = !{!17, !17, i64 0}
// CHECK:STDOUT: !17 = !{!"p1 _ZTSN6Carbon4BaseE", !13, i64 0}
// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "__destroy_thunk", linkageName: "_C__destroy_thunk:thunk.Final.Main", scope: null, file: !6, line: 11, type: !19, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !22)
// CHECK:STDOUT: !19 = !DISubroutineType(types: !20)
// CHECK:STDOUT: !20 = !{null, !21}
// CHECK:STDOUT: !21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !22 = !{!23}
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !18, type: !21)
// CHECK:STDOUT: !24 = !DILocation(line: 11, column: 1, scope: !18)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "Op", linkageName: "_COp.446491dd079aaad2:core.Destroy.Core", scope: null, file: !6, line: 11, type: !19, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !26)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !21)
// CHECK:STDOUT: !28 = !DILocation(line: 11, column: 1, scope: !25)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "Op", linkageName: "_COp.4472d163614a5082:core.Destroy.Core", scope: null, file: !6, line: 11, type: !19, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !30)
// CHECK:STDOUT: !30 = !{!31}
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !29, type: !21)
// CHECK:STDOUT: !32 = !DILocation(line: 11, column: 1, scope: !29)
// CHECK:STDOUT: !33 = distinct !DISubprogram(name: "__destroy_thunk", linkageName: "_C__destroy_thunk:thunk.Base.Main", scope: null, file: !6, line: 15, type: !19, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !34)
// CHECK:STDOUT: !34 = !{!35}
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !33, type: !21)
// CHECK:STDOUT: !36 = !DILocation(line: 15, column: 1, scope: !33)
// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "Op", linkageName: "_COp.96a711151205ee34:core.Destroy.Core", scope: null, file: !6, line: 15, type: !19, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !38)
// CHECK:STDOUT: !38 = !{!39}
// CHECK:STDOUT: !39 = !DILocalVariable(arg: 1, scope: !37, type: !21)
// CHECK:STDOUT: !40 = !DILocation(line: 15, column: 1, scope: !37)
// CHECK:STDOUT: !41 = !{!42, !42, i64 0}
// CHECK:STDOUT: !42 = !{!"p1 _ZTS1A", !13, i64 0}