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carbon-lang/toolchain/lower/testdata/interop/cpp/thunks.carbon
T
Richard Smith 5c544f7c2f Give thunks weak_odr linkage. (#7525) 
We can end up emitting the same thunk from multiple compilations in some
cases -- in particular, when the thunk is wrapping a function that is
either synthesized by the compiler or imported from C++. When this
happens, we will have multiple-definition link errors unless we allow
redefinitions across multiple files.

It'd be nice to detect when we need to do this and when we don't, but
that's a bit tricky to do in practice. Ideally, in fact, we would use a
different strategy, and emit the thunks as discardable definitions in
each compilation that *uses* them. But for now emitting them with
weak_odr linkage seems like a good way to make progress.
2026-07-17 13:25:19 +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/primitives.carbon
// EXTRA-ARGS: --clang-arg=-std=c++26
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/thunks.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/thunks.carbon
// --- need_thunk.h
struct NeedThunk {
NeedThunk();
NeedThunk(const NeedThunk&);
~NeedThunk() = default;
};
// --- multiple_thunks_in_one_class.carbon
library "[[@TEST_NAME]]";
import Cpp library "need_thunk.h";
// We intend to create multiple thunks named `Op` here to demonstrate the need
// for the mangling to include the signature function.
fn Call(n: Cpp.NeedThunk) {
var unused n2: Cpp.NeedThunk = n;
}
// --- box.h
struct A {};
struct B {};
template <typename T>
struct Box {
Box();
Box(const Box&);
~Box();
T value;
};
// --- thunks_for_distinct_specializations.carbon
library "[[@TEST_NAME]]";
import Cpp library "box.h";
// Distinct specializations of the same class template share a Carbon name and
// parent scope, so their `Copy` (and `Destroy`) thunks need distinct mangled
// names; otherwise they would collide into a single LLVM function. The
// distinguishing key is the Clang mangled type name recorded when importing a
// C++ class.
fn Call(a: Cpp.Box(Cpp.A), b: Cpp.Box(Cpp.B)) {
var unused a2: Cpp.Box(Cpp.A) = a;
var unused b2: Cpp.Box(Cpp.B) = b;
}
// --- anonymous_namespace_collision.h
namespace {
// A type in the anonymous namespace. We expose it under an alias because, once
// the global `Collide` below is declared, the unqualified name `Collide`
// refers to that global type.
struct Collide {
Collide() {}
Collide(const Collide&) {}
~Collide() {}
};
using AnonCollide = Collide;
} // namespace
// A *different* type with the same name in the global namespace.
struct Collide {
Collide() {}
Collide(const Collide&) {}
~Collide() {}
};
// --- thunks_for_anonymous_namespace_collision.carbon
library "[[@TEST_NAME]]";
import Cpp library "anonymous_namespace_collision.h";
// `Cpp.Collide` is the global type and `Cpp.AnonCollide` aliases a distinct
// type of the same name in the anonymous namespace. Carbon sees both as
// `Collide` with the same parent scope, so their `Copy` thunks would collide
// into a single LLVM function without the Clang mangled type name (which
// encodes the anonymous namespace) in the fingerprint.
fn Call(a: Cpp.Collide, b: Cpp.AnonCollide) {
var unused a2: Cpp.Collide = a;
var unused b2: Cpp.AnonCollide = b;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'multiple_thunks_in_one_class.carbon'
// CHECK:STDOUT: source_filename = "multiple_thunks_in_one_class.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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCall.Main(ptr %n) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n2.var = alloca [1 x i8], align 1, !dbg !18
// CHECK:STDOUT: %.loc9_34.1.temp = alloca [1 x i8], align 1, !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n2.var), !dbg !18
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc9_34.1.temp), !dbg !19
// CHECK:STDOUT: call void @_ZN9NeedThunkC1ERKS_.carbon_thunk._(ptr %n, ptr %n2.var), !dbg !19
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_ZN9NeedThunkC1ERKS_.carbon_thunk._(ptr noundef %0, ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !21
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !21
// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8, !tbaa !21
// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8, !tbaa !21
// CHECK:STDOUT: call void @_ZN9NeedThunkC1ERKS_(ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 1 dereferenceable(1) %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Copy.60e3c6e2415a2ad6.Core:NeedThunk.Cpp"(ptr sret([1 x i8]) %return, ptr %self) #2 !dbg !24 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN9NeedThunkC1ERKS_.carbon_thunk._(ptr %self, ptr %return), !dbg !30
// CHECK:STDOUT: ret void, !dbg !30
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Destroy.092ad14c7174f642.Core:NeedThunk.Cpp"(ptr %self) #2 !dbg !31 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !34
// 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)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN9NeedThunkC1ERKS_(ptr noundef nonnull align 1 dereferenceable(1), ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress 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 #2 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #4 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3, !4, !5, !6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "multiple_thunks_in_one_class.carbon", directory: "")
// 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 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !6 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !7 = !{!8, !9, i64 0}
// CHECK:STDOUT: !8 = !{!"__libc_errno", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !1, line: 8, type: !13, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !16)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null, !15}
// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !16 = !{!17}
// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
// CHECK:STDOUT: !18 = !DILocation(line: 9, column: 3, scope: !12)
// CHECK:STDOUT: !19 = !DILocation(line: 9, column: 34, scope: !12)
// CHECK:STDOUT: !20 = !DILocation(line: 8, column: 1, scope: !12)
// CHECK:STDOUT: !21 = !{!22, !22, i64 0}
// CHECK:STDOUT: !22 = !{!"p1 _ZTS9NeedThunk", !23, i64 0}
// CHECK:STDOUT: !23 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !24 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Copy.60e3c6e2415a2ad6.Core:NeedThunk.Cpp", scope: null, file: !25, line: 4, type: !26, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !28)
// CHECK:STDOUT: !25 = !DIFile(filename: "./need_thunk.h", directory: "")
// CHECK:STDOUT: !26 = !DISubroutineType(types: !27)
// CHECK:STDOUT: !27 = !{!15, !15}
// CHECK:STDOUT: !28 = !{!29}
// CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !24, type: !15)
// CHECK:STDOUT: !30 = !DILocation(line: 4, column: 3, scope: !24)
// CHECK:STDOUT: !31 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Destroy.092ad14c7174f642.Core:NeedThunk.Cpp", scope: null, file: !25, line: 5, type: !13, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !32)
// CHECK:STDOUT: !32 = !{!33}
// CHECK:STDOUT: !33 = !DILocalVariable(arg: 1, scope: !31, type: !15)
// CHECK:STDOUT: !34 = !DILocation(line: 5, column: 3, scope: !31)
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'thunks_for_distinct_specializations.carbon'
// CHECK:STDOUT: source_filename = "thunks_for_distinct_specializations.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: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCall.Main(ptr %a, ptr %b) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a2.var = alloca [1 x i8], align 1, !dbg !19
// CHECK:STDOUT: %.loc12_35.1.temp = alloca [1 x i8], align 1, !dbg !20
// CHECK:STDOUT: %b2.var = alloca [1 x i8], align 1, !dbg !21
// CHECK:STDOUT: %.loc13_35.1.temp = alloca [1 x i8], align 1, !dbg !22
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a2.var), !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_35.1.temp), !dbg !20
// CHECK:STDOUT: call void @_ZN3BoxI1AEC1ERKS1_.carbon_thunk._(ptr %a, ptr %a2.var), !dbg !20
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %b2.var), !dbg !21
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc13_35.1.temp), !dbg !22
// CHECK:STDOUT: call void @_ZN3BoxI1BEC1ERKS1_.carbon_thunk._(ptr %b, ptr %b2.var), !dbg !22
// CHECK:STDOUT: call void @_ZN3BoxI1BED1Ev(ptr %b2.var), !dbg !21
// CHECK:STDOUT: call void @_ZN3BoxI1AED1Ev(ptr %a2.var), !dbg !19
// CHECK:STDOUT: ret void, !dbg !23
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_ZN3BoxI1AEC1ERKS1_.carbon_thunk._(ptr noundef %0, ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !24
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !24
// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8, !tbaa !24
// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8, !tbaa !24
// CHECK:STDOUT: call void @_ZN3BoxI1AEC1ERKS1_(ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 1 dereferenceable(1) %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Copy.c0735c73762b4d1c.Core:Box.Cpp"(ptr sret([1 x i8]) %return, ptr %self) #2 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN3BoxI1AEC1ERKS1_.carbon_thunk._(ptr %self, ptr %return), !dbg !33
// CHECK:STDOUT: ret void, !dbg !33
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_ZN3BoxI1BEC1ERKS1_.carbon_thunk._(ptr noundef %0, ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !34
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !34
// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8, !tbaa !34
// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8, !tbaa !34
// CHECK:STDOUT: call void @_ZN3BoxI1BEC1ERKS1_(ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 1 dereferenceable(1) %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Copy.2c1dd62357f2b914.Core:Box.Cpp"(ptr sret([1 x i8]) %return, ptr %self) #2 !dbg !36 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN3BoxI1BEC1ERKS1_.carbon_thunk._(ptr %self, ptr %return), !dbg !39
// CHECK:STDOUT: ret void, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: declare void @_ZN3BoxI1BED1Ev(ptr noundef nonnull align 1 dead_on_return(1) dereferenceable(1)) unnamed_addr #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: declare void @_ZN3BoxI1AED1Ev(ptr noundef nonnull align 1 dead_on_return(1) dereferenceable(1)) unnamed_addr #3
// 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)) #4
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN3BoxI1AEC1ERKS1_(ptr noundef nonnull align 1 dereferenceable(1), ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #5
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_ZN3BoxI1BEC1ERKS1_(ptr noundef nonnull align 1 dereferenceable(1), ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #5
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress 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 #2 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #3 = { 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 #4 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #5 = { "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:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3, !4, !5, !6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "thunks_for_distinct_specializations.carbon", directory: "")
// 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 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !6 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !7 = !{!8, !9, i64 0}
// CHECK:STDOUT: !8 = !{!"__libc_errno", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !1, line: 11, type: !13, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !16)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null, !15, !15}
// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !16 = !{!17, !18}
// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
// CHECK:STDOUT: !18 = !DILocalVariable(arg: 2, scope: !12, type: !15)
// CHECK:STDOUT: !19 = !DILocation(line: 12, column: 3, scope: !12)
// CHECK:STDOUT: !20 = !DILocation(line: 12, column: 35, scope: !12)
// CHECK:STDOUT: !21 = !DILocation(line: 13, column: 3, scope: !12)
// CHECK:STDOUT: !22 = !DILocation(line: 13, column: 35, scope: !12)
// CHECK:STDOUT: !23 = !DILocation(line: 11, column: 1, scope: !12)
// CHECK:STDOUT: !24 = !{!25, !25, i64 0}
// CHECK:STDOUT: !25 = !{!"p1 _ZTS3BoxI1AE", !26, i64 0}
// CHECK:STDOUT: !26 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Copy.c0735c73762b4d1c.Core:Box.Cpp", scope: null, file: !28, line: 8, type: !29, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !31)
// CHECK:STDOUT: !28 = !DIFile(filename: "./box.h", directory: "")
// CHECK:STDOUT: !29 = !DISubroutineType(types: !30)
// CHECK:STDOUT: !30 = !{!15, !15}
// CHECK:STDOUT: !31 = !{!32}
// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !27, type: !15)
// CHECK:STDOUT: !33 = !DILocation(line: 8, column: 3, scope: !27)
// CHECK:STDOUT: !34 = !{!35, !35, i64 0}
// CHECK:STDOUT: !35 = !{!"p1 _ZTS3BoxI1BE", !26, i64 0}
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Copy.2c1dd62357f2b914.Core:Box.Cpp", scope: null, file: !28, line: 8, type: !29, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !37)
// CHECK:STDOUT: !37 = !{!38}
// CHECK:STDOUT: !38 = !DILocalVariable(arg: 1, scope: !36, type: !15)
// CHECK:STDOUT: !39 = !DILocation(line: 8, column: 3, scope: !36)
// CHECK:STDOUT:
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'thunks_for_anonymous_namespace_collision.carbon'
// CHECK:STDOUT: source_filename = "thunks_for_anonymous_namespace_collision.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: $_ZN7CollideD2Ev = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_ZN7CollideC2ERKS_ = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCall.Main(ptr %a, ptr %b) #0 !dbg !12 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a2.var = alloca [1 x i8], align 1, !dbg !19
// CHECK:STDOUT: %.loc12_32.1.temp = alloca [1 x i8], align 1, !dbg !20
// CHECK:STDOUT: %b2.var = alloca [1 x i8], align 1, !dbg !21
// CHECK:STDOUT: %.loc13_36.1.temp = alloca [1 x i8], align 1, !dbg !22
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a2.var), !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_32.1.temp), !dbg !20
// CHECK:STDOUT: call void @_ZN7CollideC1ERKS_.carbon_thunk._(ptr %a, ptr %a2.var), !dbg !20
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %b2.var), !dbg !21
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc13_36.1.temp), !dbg !22
// CHECK:STDOUT: call void @_ZN12_GLOBAL__N_17CollideC1ERKS0_.carbon_thunk._(ptr %b, ptr %b2.var), !dbg !22
// CHECK:STDOUT: call void @_ZN12_GLOBAL__N_17CollideD2Ev(ptr %b2.var), !dbg !21
// CHECK:STDOUT: call void @_ZN7CollideD2Ev(ptr %a2.var), !dbg !19
// CHECK:STDOUT: ret void, !dbg !23
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_ZN7CollideC1ERKS_.carbon_thunk._(ptr noundef %0, ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !24
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !24
// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8, !tbaa !24
// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8, !tbaa !24
// CHECK:STDOUT: call void @_ZN7CollideC2ERKS_(ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 1 dereferenceable(1) %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Copy.9e522bb4dbf82e5c.Core:Collide.Cpp"(ptr sret([1 x i8]) %return, ptr %self) #2 !dbg !27 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN7CollideC1ERKS_.carbon_thunk._(ptr %self, ptr %return), !dbg !33
// CHECK:STDOUT: ret void, !dbg !33
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_ZN12_GLOBAL__N_17CollideC1ERKS0_.carbon_thunk._(ptr noundef %0, ptr noundef %return) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !34
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !34
// CHECK:STDOUT: %1 = load ptr, ptr %return.addr, align 8, !tbaa !34
// CHECK:STDOUT: %2 = load ptr, ptr %.addr, align 8, !tbaa !34
// CHECK:STDOUT: call void @_ZN12_GLOBAL__N_17CollideC2ERKS0_(ptr noundef nonnull align 1 dereferenceable(1) %1, ptr noundef nonnull align 1 dereferenceable(1) %2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define weak_odr void @"_COp:thunk:Copy.d1fe27f3241437fa.Core:Collide..Cpp"(ptr sret([1 x i8]) %return, ptr %self) #2 !dbg !36 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_ZN12_GLOBAL__N_17CollideC1ERKS0_.carbon_thunk._(ptr %self, ptr %return), !dbg !39
// CHECK:STDOUT: ret void, !dbg !39
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN12_GLOBAL__N_17CollideD2Ev(ptr noundef nonnull align 1 dereferenceable(1) %this) unnamed_addr #3 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !34
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN7CollideD2Ev(ptr noundef nonnull align 1 dereferenceable(1) %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 !24
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// 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)) #4
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define linkonce_odr dso_local void @_ZN7CollideC2ERKS_(ptr noundef nonnull align 1 dereferenceable(1) %this, ptr noundef nonnull align 1 dereferenceable(1) %0) unnamed_addr #3 comdat align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !24
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !24
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress nounwind uwtable
// CHECK:STDOUT: define internal void @_ZN12_GLOBAL__N_17CollideC2ERKS0_(ptr noundef nonnull align 1 dereferenceable(1) %this, ptr noundef nonnull align 1 dereferenceable(1) %0) unnamed_addr #3 align 2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %this.addr = alloca ptr, align 8
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %this, ptr %this.addr, align 8, !tbaa !34
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8, !tbaa !34
// CHECK:STDOUT: %this1 = load ptr, ptr %this.addr, align 8
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress 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 #2 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #3 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3, !4, !5, !6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "thunks_for_anonymous_namespace_collision.carbon", directory: "")
// 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 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !6 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !7 = !{!8, !9, i64 0}
// CHECK:STDOUT: !8 = !{!"__libc_errno", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"int", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"omnipotent char", !11, i64 0}
// CHECK:STDOUT: !11 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !12 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !1, line: 11, type: !13, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !16)
// CHECK:STDOUT: !13 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !14 = !{null, !15, !15}
// CHECK:STDOUT: !15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !16 = !{!17, !18}
// CHECK:STDOUT: !17 = !DILocalVariable(arg: 1, scope: !12, type: !15)
// CHECK:STDOUT: !18 = !DILocalVariable(arg: 2, scope: !12, type: !15)
// CHECK:STDOUT: !19 = !DILocation(line: 12, column: 3, scope: !12)
// CHECK:STDOUT: !20 = !DILocation(line: 12, column: 32, scope: !12)
// CHECK:STDOUT: !21 = !DILocation(line: 13, column: 3, scope: !12)
// CHECK:STDOUT: !22 = !DILocation(line: 13, column: 36, scope: !12)
// CHECK:STDOUT: !23 = !DILocation(line: 11, column: 1, scope: !12)
// CHECK:STDOUT: !24 = !{!25, !25, i64 0}
// CHECK:STDOUT: !25 = !{!"p1 _ZTS7Collide", !26, i64 0}
// CHECK:STDOUT: !26 = !{!"any pointer", !10, i64 0}
// CHECK:STDOUT: !27 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Copy.9e522bb4dbf82e5c.Core:Collide.Cpp", scope: null, file: !28, line: 17, type: !29, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !31)
// CHECK:STDOUT: !28 = !DIFile(filename: "./anonymous_namespace_collision.h", directory: "")
// CHECK:STDOUT: !29 = !DISubroutineType(types: !30)
// CHECK:STDOUT: !30 = !{!15, !15}
// CHECK:STDOUT: !31 = !{!32}
// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !27, type: !15)
// CHECK:STDOUT: !33 = !DILocation(line: 17, column: 3, scope: !27)
// CHECK:STDOUT: !34 = !{!35, !35, i64 0}
// CHECK:STDOUT: !35 = !{!"p1 _ZTSN12_GLOBAL__N_17CollideE", !26, i64 0}
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "Op", linkageName: "_COp:thunk:Copy.d1fe27f3241437fa.Core:Collide..Cpp", scope: null, file: !28, line: 8, type: !29, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !37)
// CHECK:STDOUT: !37 = !{!38}
// CHECK:STDOUT: !38 = !DILocalVariable(arg: 1, scope: !36, type: !15)
// CHECK:STDOUT: !39 = !DILocation(line: 8, column: 3, scope: !36)
// CHECK:STDOUT:
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